O
&M
aintenance
anual
PACV-S
Nomenclature . . . 5
Safety Instructions . . . . 5
Specifi c Hazards. . . . 5
Points To Remember. . . . 6
Component Features . . . . 7
Liquid Line Controls . . . . 9
Electrical Control panel . . . 10
Room Unit . . . 11 2 Installation Receiving of Equipment . . . 13 Rigging . . . 13 Handling . . . 13 Storage . . . 14
Location & Space Requirements . . . 14
Pre-Installation Checkup. . . 15
Preparation For Installation . . . 16
Carrying Out Installation . . . 16
Condensate Draining . . . 16 3 Operation Pre-Startup Checklist . . . 17 Pre-Startup Procedure . . . 17 Service Record . . . 18 Unit Startup . . . 19
Display & Keypad Operation . . . 20
Alarms . . . 21
List of alarms in the unit controller . . . 21
Operation of the Room Unit . . . 22
Setting the address of the room unit . . . 22
switching in and switching off the unit . . . 22
Commissioning Test Report . . . 25
4 Maintenance Periodic Maintenance . . . 26
Leak Testing, Evacuation & Charging Procedures . . . 28
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Mold In And Around Drain Pans . . . 36
Coil . . . 37
Coil Cleaning . . . 37
Compressor Oil . . . 37
Adding Oil . . . 37
Dismantling & Disposal . . . 38
Expansion valve service & maintenance . . . 38
Hot gas by pass . . . 40
Refrigerant Recovery, Recycling & Reclamation . . . 43 Trouble Shooting . . . 46 5 Appendix Appendix I . . . 49 Loading Points . . . 49 Appendix II . . . 51 Dimensional Data . . . 51 Appendix III . . . 55
Refrigerant Piping Layout . . . 55
Appendix V . . . 57
Filter Dimension . . . 57
Appendix IV . . . 58
Spare parts . . . 58
Appendix VII . . . 57
Typical wiring diagram . . . 57
Appendix VIII . . . 62
Typical Wiring Diagram . . . 62
Appendix IX . . . 63
Instructions For Downloading/Upgrading The Software For Microprocessor . . . 63
Appendix X . . . 64
This manual must be carefully read and followed in order to avoid unnecessary/dangerous conditions in the machine and to guarantee the safety of the equipment. The contents in this manual are mainly the installation and operating instructions of your Package Air Conditioning unit. The precautions mentioned through out this manual should be taken seriously to derive maximum safety for all. Installation, service and start up of any air-conditioning equipment should be done only by a qualifi ed personnel or service technician. Always observe precautions in the manual and be familiar of all the symbols / labels attached in the unit when dealing or working with the equipment.
Unit Description
The PACV-S series is a modern, diversifi ed and environment friendly series of packaged air conditioners which use R - 134a as the refrigerant.
The complete PACV-S package provides an extremely rugged, heavy duty, long-life, energy effi cient and self-contained package air conditioner that will provide cooling at higher effi ciency over a long and extended life. What makes PACV-S series the pride
of SKM products is the use of :
The SKM PACV-S series packaged air conditioning units are durable, dependable, strong, reliable, versatile, quiet and energy effi cient. Wherever a heavy duty packaged air-conditioner is required, the PACV-S series should be an automatic choice.
Unit Name Plate
Typical SKM Air Cooled Packaged Unit nameplate is as shown.
Check the nameplate data with the P.O/ Submittal when receiving the unit.
For the representation and understanding of the points of caution, attention, danger, and information. Following symbols are used throughout the manual.
Note:- It is not the intention of this manual to cover all possible variations in systems that may occur or to provide comprehensive information concerning every possible contingence that may be encountered during an installation, operation and maintenance. If additional information is required or if specifi c problems arise that are not fully discussed in this manual, contact your local offi ce.
Always heed all WARNING and SAFETY INSTRUCTION boxes. Always read and heed all instructions in this manual carefully. Failure to follow WARNING, SAFETY INSTRUCTIONS and all other instructions could result in severe personal injuries and death.
Introduction
General Warning
CAUTION
General Information.
INFORMATION
Take special attention and points to be noted.
ATTENTION
Indicates dangers through electrical shock, system pressure, and location.DANGER
Indicates dangers by high voltageHIGH VOLTAGE
Indicates dangers by moving/rotating partsMOVING/ROTATING PARTS
HOT PIPES
Indicates dangers by hot pipes MODEL Qty KW FLA Qty KW FLA MANUFACTURING SERIAL NOMANUFACTURED IN SHARJAH,UNITED ARAB EMIRATES HEATER KW/NO. OF STAGES
R-134A CHARGE(KGS) CONDENSER MOTOR EVAPORATOR MOTOR MIN.CIR AMPS/MAX. FUSE AMPS
COMPRESSOR MODEL Qty LRA RLA
POWER SUPPLY (V/Ph/Hz) CONTROL VOLTAGE(V/Ph/Hz)
Factory/Field ITEM CODE
• High effi ciency totally sealed hermetic scroll compressor.
• Totally enclosed, Class F insulated, IP55 protected condenser and evaporator fan motors.
• Heavy duty condenser and evaporator coils optimised in design for long-life maintenance free operation.
• Cabinet construction specifi cally designed for Gulf climates.
• IP 54 Electrical panel.
• Factory installed, advanced and user friendly microprocessor based control system. • Interface capability with major BMS protocols
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SKM reserves the right to change, in part or in whole the specifi cations of its Air Conditioning Equipment at any time in order to add the latest technology. Therefore, the enclosed information may change without any prior notice.
Nomenclature
Safety Instructions
Carefully read the content of this manual before installing the air conditioning equipment. For maximum safety installers should always follow the list of warnings. During the installation process care should be taken to avoid any accidents related to: 1. High voltage
2. High pressure in the system 3. Hot pipes due to discharge
temperature
4. Moving/Rotating parts
This manual explains how to install, operate and maintain SKM PACV-S series, Air cooled packaged unit. The manufacturer shall not be responsible for damages arising from wrong practices used. So SKM recommends to do the installation including the connection of electricity, operation and maintenance by a person qualifi ed for the air- conditioning and refrigeration work only.
The manufacturer shall not be responsible for damages originating from unauthorized changes or the improper connection of electricity and not adhering to the operation limits included in the manual. Also this shall invalidate the warranty. The air conditioning equipment should be used only for the applications for which it has been designed.
p
Refer product name plate, wiring diagrams and catalogues for the electrical characteristic, of the equipment to select correct wire sizes and isolators prior to the insulation. It is the responsibility of the user or the person installing the equipment to provide proper grounding and branch circuit protection according to NEC, Local & National safety regulations.
This Air Conditioning equipment must be disconnected from the mains if any repair work is to be carried out. Do not use the units if damaged. If problems occur, switch the unit off and disconnect it from the power supply. The control ON/OFF switch in the control panel does not disconnect the equipment from the mains and thus it is not to be used as a safety switch.
Do not attempt to repair, move, alter or reinstall the unit. If performed by an unauthorized personal, these operations may cause electrical shock or fi res.
Always remember to inspect the units, refrigerant tubes and protection regularly. These operations should be performed by a qualifi ed personnel only.
Contact SKM After sales in case any technical support is required.
PAC V - 5 1 008 S Y
Packaged Air Conditioner V-shaped condenser constructionPower supply frequency 5 = 50 Hz
6 = 60 Hz
Power Supply Code Y: 380-415V/3Ph/50Hz P: 440V/3Ph/50Hz R: 380V/3Ph/60Hz E: 460V/3Ph/60Hz T: 220V/3Ph/60Hz Scroll Compressor (R-134a) Nominal Capacity (TR) No. of Refrigerant Circuits
Specifi c Hazards
• Do not stand or work under suspended loads.
• Wear a hard hat, safety shoes and gloves.
Noise Emission
The sound emission expected in normal use of the fan should be duly taken into account.
Wear ear defenders when working near to or on the running fan!
Rotating Shafts and Impellers
• Objects fi xed to rotating shafts and impellers can fl y off at an angle and cause serious injury.
• Articles of clothing and hair can get caught in rotating shafts and impellers.
Heavy Loads
The heavy weight of fans and their components entail the following risks during maintenance:
• Risk of being trapped,
crushed or cut by moving or toppling machinery.
Being an electromechanical machine, the unit may fail or cause diffi culties. Remembering the following few points will ensure correct and prompt rectifi cation and continued optimal performance.
Points To Remember
A correct installation ensuring proper clearances for correct condenser air fl ow and maintenance as per the drawings shown for “recommended clearances” Proper level base on foundation with appropriate vibration mount. All connections and hook up to be followed as per instructions, which ensures long term trouble free operation and performance.
If power fuse is blown off, be sure to replace the same with a new fuse having pre designed Amperage. Do not use a steel wire or copper wire instead of proper fuse. Genuine fuse ensures safety and proper protection. Incorrect fusing may cause fi re or trouble with your equipment.
Before replacing any fuse or opening any electrical panel door, make sure the main switch is OFF.
Do not spray or sprinkle water directly over or into the air conditioning equipment for cleaning because electric insulations and terminal of the components are opened.
Following a power supply interruption during operation, the microprocessor is programmed to restart the unit automatically when power supply has returned to normal.
Periodical maintenance of the unit will give better performance in the long run than only break down maintenance.
The microprocessor controller is programmed to stop functioning the Air conditioning equipment including the compressor in the event of a safety device trips. The problem should be investigated and repaired or rectifi ed as per trouble shooting instruction in this manual before attempting to reset and restarting the machine.
This Air conditioning equipment is meant to be installed out doors and suitable to normal environment elements. Do not try to cover or block any inlets or discharge openings to condenser.
Insist on maintenance from a reputable maintenance contractor to ensure a trouble free operation.
• Do not remove guards during operation.
• Do not wear loose-fi tting
clothing when working near rotating shafts and impellers.
• Wear goggles.
Hot Surfaces
• There is a risk of sustaining burns or scalds on hot surfaces during operation.
• Do not touch the Motor, Compressor body, Discharge line during operation.
• When the condenser fan has
stopped wait until the motor has cooled down.
• Wear protective gloves.
Electrical Shock Hazards
• All power must be disconnected prior to installation and servicing this equipment. More than one source of
power may be present. Disconnect all power sources to avoid electrocution or shock injuries.
• Avoid breathing fi ber glass dust. • Use a NIOSH approved dust/mist respirator. • Avoid contact with the skin or eyes. Wear
long-sleeved, loose-fi tting clothing, gloves, and eye protection.
• Wash clothes separately from other
clothing: rinse washer thoroughly.
• Operations such as sawing, blowing,
tear-out, and spraying may generate fi bre concentrations requiring additional respiratory protection. Use the appropriate NIOSH approved respiration in these situations.
Fiber glass Insulation!
This Product contains fi ber glass wool. Disturbing the insulation in this product during installation, maintenance or repair will expose you to airborne
particles of glass wool fi bers and ceramic fi bers. All necessary Personal Protective Equipment (PPE) including gloves, eye protection, mask, long sleeves and pants must be worn when working with products containing fi breglass wool. Exposition to glass wool fi bers without all necessary PPE equipment could result in cancer, respiratory, skin or eye irritation, which could result in death or serious injury.
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Compressor
Compressors used in PACV-S packaged unit series are hermetically sealed, compact scroll with the following features:
Vacuum operation!
Compressor damage!
Scroll compressors should never be used to evacuate a refrigeration or air-conditioning system.
Do not pump down the scroll compressor into a vacuum!
Three phase compressors only: On initial startup, if the compressor sound is abnormally high and the readings
of suction and discharge pressures are outside normal range, there is a possibility that the compressor rotation is in the reverse direction.
In this case, interchange any two legs of the power supply and attempt to restart. Running a scroll compressor in reverse direction for an extended period of time will cause damage to the compressor. such damage is not covered under manufacturer’s limited warranty.
Reverse rotation for 5 to 15 minutes will result in the overheating of motor windings. In this case, the thermostat in the motor windings open and result in stopping of the compressor. Continued reverse operation of scroll compressor will result in failure of scroll compressors. Such failures are
• High Effi ciency.
• Quite operation, Low Sound levels. • Compact and light .
• Limited wear.
• 70% fewer moving parts than comparably sized
reciprocating compressors
• Unique ability to handle liquid refrigerant. • Suction gas motor cooling.
• Centrifugal oil pumps with fi lter and magnet. • Brazed fi ttings or Rotalock as options.
• Multiple refrigerant circuits on larger units provides effi cient part load.
Parallel Operation
A parallel compressors installation, with common suction line and common discharge line, gives a reduced operating cost through greater control of capacity and power consumption. This is achieved by staggering compressor switch-on sequences that allow the parallel system to match its power with the capacity needed. By switching-off individual compressor from parallel installation, while other compressor is operating 100%, the improved part load effi ciency can be achieved. The specially developed and adopted oil equalization system ensures correct compressors operation, oil balancing between compressors and reliability.
Condensers
Condenser coils are manufactured of seamless copper tubes mechanically bonded to aluminum
fi ns to ensure optimum heat transfer. All coils are tested against leakage by air pressure of 450 psig (3100 kPa) under water. All standard coils are 2,3 or 4 rows/14 FPI, 3/8” (9.5 mm) O.D. tubes. An integral subcooling circuit is provided to increase the cooling capacity, without additional operating cost.
For different application requirements, other optional condenser fi n materials are available:
• Copper fi ns.
• Electrotinned Copper Fins.
• Copper fi nned coils with electro-tinned after manufacturing. • Precoated Aluminum fi ns
The pre-coated is hydrophobic polyurethane resin. This option provides substantial corrosion protection beyond standard coil construction.
• Aeris Guard Coil Coating
The Aeris Guard Coil is a self etching high performance modifi ed epoxy fi nish that is specifi cally designed to coat and protect Aluminum and Copper surfaces. In addition, the coating is ideal for the protection of ferrous and non ferrous materials.
SKM PACV-S series, all models, are restricted to a 14FPI (1.8 mm) fi n spacing condenser coil. Gulf dust storms and the general level of available maintenance in Gulf countries ensures this condenser coil design shall provide long life and maintenance free operation with the least possibility operational blockage on the condenser. Ample condenser surface and sensible air fl ow across the condenser ensures a low temperature differential between condensing temperature and the high Gulf ambients making the PACV-S packaged unit perform effi ciently and durably.
NOT covered under the manufacturer’s limited warranty.
Condenser Fans
C o n d e n s e r f a n s a r e propeller type, aluminium alloy blades, directly driven by electric motors. Motors are Totally Enclosed Air Over (TEAO) six pole with class ‘F’ insulation and minimum IP55
protection. The TEAO and class ‘F’ insulation features ensure long life and are unique for SKM.
The motors are factory wired, using wires specially selected for high ambients operation, to unit control panel where the motor contactors are located to control the operation of these motors. The condenser fans are individually statically and dynamically balanced at the factory.
Complete fan assembly is provided with suitable acrylic coated fan guard.
Evaporator
Evaporator coils are manufactured of seamless copper tubes mechanically bonded to aluminium fi ns to ensure optimum heat transfer. All evaporator coils are tested against leakage
by air pressure of 300 psig (2068 kPa) under water. The DX evaporator coils are complete with headers of seamless
copper tubing. Supply headers incorporate a correctly sized distributor. For different application requirements, other
evaporator coil material and/or treatment are available on request.
Evaporator coil supplied with suitable size thermostatic expansion valve(s) and multi-circuited distributors providing capacity modulation to match the compressors. The cross wave fi ns and staggered tubes design uses the evaporator surface effectively by creating uniform air turbulence and optimum heat transfer over the entire fi nned surface. Requirements for higher face velocities can be handled by use of moisture eliminators to avoid carryover.
• Copper fi ns.
• Electrotinned Copper fi ns.
• Copper fi nned coils with electro-tinned after manufacturing.
• Precoated Aluminum fi ns.
The pre-coated is hydrophobic polyurethane resin. This option provides substantial corrosion protection beyond standard coil construction.
• Aeris Guard Coil Coating.
The Aeris Guard Coil is a self etching high performance modifi ed epoxy fi nish that is specifi cally designed to coat and protect Aluminum and Copper surfaces. In addition, the coating is ideal for the protection of ferrous and non ferrous materials.
Fan Section
Fans in the PACV-S units are selected for the best sound characteristics based on maximum fan effi ciency. More than one arrangement of evaporator fans are used in the PACV-S series packaged units due to the wide range of air fl ow rates.
Commonly, all fans are double inlet, double width, centrifugal type with forward curved impellers provide the combination of effi ciency and quietness of operation. All fans are statically and dynamically balanced, belt driven by motor sizes up to 15 kW are provided with adjustable pitch pulleys as standard.
Above 15 kW motor sizes are equipped with fi xed pitch pulleys s standard and adjustable pitch pulleys are option. Specify PP. Single fan is used for PACV-51008S, PACV-51010S, PACV- 61009S & PACV-61012S models. Models PACV-51014S~PACV- 52055S & PACV- 61018S~PACV- 62066S are equipped with two fans. These fans are mounted on a single heavy duty shaft driven by a single electric motor. Shaft end insert into over sized, tapered lock self aligning long life bearings. The motor is mounted on an adjustable base, so that belt tension can be easily adjusted. Models PACV-52065S and PACV-62076S onwards, use single fan assembly, which has maximum strength, high performance, quietness and reliability. These fans use self aligned ball or pillow block bearings that are greased for life. Pillow block bearings are provided with re-greasing fi ttings. The motor is mounted on an adjustable base, so that belt tension can be easily adjusted. The complete fan-motor drive assembly is mounted on a fl oating sub-base. In order to limit transmission of noise and vibration, the complete fan motor sub-base assembly is mounted on anti-vibration mounts. Flexible connection is provided between fan discharge and casing panel to avoid transmission of vibration to the connecting duct.
The optional modular construction units for models PACV-51008S~PACV-52055S & PACV-61009S~62066S are also using the same fan specifi cations as mentioned above.
The electric motors are foot mounted, 4 pole, totally enclosed fan cooled (TEFC), IP-55 protected, Class F insulation with Class B temperature rise.
Drive package is factory selected for the medium air fl ow rate as shown in the capacity ratings. Alternative drive packages to meet specifi c job or client requirements can be provided.
Refrigerant Circuit
PACV-S series comes complete, as standard, with correctly sized and piped refrigerant lines including sight glass, fi lter drier, thermostatic expansion valve, solenoid valve, shut-off valve, and a full operating charge of R-134a in each circuit.
Piping is fabricated from ACR grade copper piping. Suction line is insulated with ½” (12 mm) wall thickness closed cell pipe insulation.
Filter Section
PACV-S series can be with a range of fi lter sections and fi lters to meet requirements for the most demanding applications.
• Flat or vee fi lter sections to accommodate 1” or 2” cleanable aluminium media fi lters can be provided. • A bag fi lter section to house 22”, 30” or 36” deep
bag fi lters having effi ciencies as desired can also be provided, as required. Filter sections come with latches to provide easy access for removal and for maintenance.
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Shut Off Valve/Ball Valve
Usually used so that portions of refrigeration system can be isolated for service or repairs.
Sight glass
Used to observe the fl ow of liquid refrigerant. Bubbles or foaming in the sight glass indicate a shortage of refrigerant or restriction in the liquid line that can adversely affect system operation. Sight glasses are widely used as a means of determining if the system is adequately charged.
Filter Driers
Driers are mounted in the refrigerant liquid line to ensure that all the refrigerant in circulation passes through the drier each time it circulates through the system so as to remove any moisture or foreign matter from the refrigerant stream. To order a sand trap louvre from SKM specify fresh air opening
size with option ASL.
Casing/Structure
Designed for ease of handling and low cost to install. The PACV-S Air Cooled Packaged Units are factory assembled and mounted on a rigid base. The unit casing used in PACV-S Packaged units is made of zinc coated galvanized steel sheets conforming to JIS-G 3302 and ASTM A653 which is phosphatized then baked after an electrostatic powder coat of approximately 60 microns.
This fi nish and coating pass a 1000 hours in 5 % salt spray testing at 95°F (35°C) and 95% relative humidity as per ASTM B117. The entire casing panels are designed to be leak proof against rain and ensure rain cannot enter the PACV-S series packaged air conditioner interior. Evaporator section sealed
by the use of vinyl gasketing material.
The evaporator section is insulated from all sides with black-neoprene faced heavy density 1” thick fi ber glass insulation
for models up to PACV-52055S & 62066S and 2” thick fi ber glass insulation for models PACV-52065S & 62076S onwards. The insulation cum sound liner meets the fi re requirements of NFPA90A and is secured with mechanical
fasteners in addition to water resistant adhesive. For applications requiring an inner skin in the evaporator
section, option DSE provides 0.7 mm galvanized inner skin. Suitable isolation to ensure no cold-bridges
and no condensation on the exterior of the units is provided. The condensate drain pan is heavily insulated to ensure that condensation may not
occur. Stainless steel condensate drain pans are available on request.
Liquid Line Controls
Thermostatic Expansion Valve
For controlling the fl ow of liquid refrigerant into the evaporator, an orifi ce in the valve meters the fl ow into the evaporator, the rate of being modulated as required by needle type plunger and seat, which varies the orifi ce opening. • On 100% fresh air applications an initial sand
trap louvre can effectively minimize entrance of sand into the air stream.
• High effi ciency mini pleat panel fi lters are available as an alternative for bag fi lter where space is limited. Filter sections come with latches to provide easy access for removal and for maintenance.
Low Pressure Switch
This switch is fi tted in the suction side of each refrigerant circuit and is wired to the unit controller digital input. Its function is to protect the compressors against low suction pressure. If the refrigerant circuit is On to meet the cooling demand and this switch remains open for a specifi c time (low pressure alarm delay set point), then the unit controller will switch off that circuit and generate Low suction pressure alarm.
Solenoid Valve
It is used to stop the fl ow of refrigerant within the refrigeration system.
The valve is typically a normally-closed type of valve so that it is closed when it is energized
Electrical Control Panel
The unit mounted control panel enclosure is fabricated out of heavy gauge sheet steel in phosphatized powder coated baked fi nish. The enclosure conforms to IP54 as per guidelines in IEC 529. A hinged access door and key-fastener is provided for easy access and security. The panel is factory wired in accordance with NEC 430 & 440, labelled, tagged and features 220V/240v controls. • All compressors are with DOL starting.
• Individual compressor, condenser fan motors and evaporator fan motor contactors.
• Motor protector circuit breaker for condenser and evaporator fan motors.
• Control circuit breaker. • Control circuit on/off switch. • Microprocessor control boards. • Control Relays.
• Power and control terminal blocks.
Microprocessor Controller
All PACV-S series package units are equipped with a full function microprocessor based controller as a standard feature. The controller is factory programmed for the control of evaporator fan, compressors and condenser fans. The controller comes with a built in keypad and display for simple but meaningful man machine interface. This controller provides complete operational control for the unit and has built-in auto diagnostic capability that can signal normal operation or alarm conditions as well as shutting down the unit or system if necessary.
.The Main Features of the controller are as follows: • Built in LCD display with back light. • Roll & push knob and 3 function buttons. • Battery backed up built in real time clock.
• Multiple authorization level to provide tight security for the control system.
• Capacity control based on room temperature or
return air temperature. • Alarm history.
• A sleek & elegant design room unit.
Discharge Pressure Transducer
This transducer is fi tted in the discharge side of each refrigerant circuit and is wired to the analogue input of the unit controller. Through this transducer, the unit controller will monitor the discharge pressure of the refrigerant circuits and cycle the condenser fans (when compressors are running) in order to maintain proper head pressure.
F a c t o r y s e t t i n g s f o r p r e s s u r e
switches and Fan cycling
Factory Switch Settings
Description Cut Out (PSIG) Cut In (PSIG) Low Pressure Switch 14.5 29 High Pressure Switch 300 200 Table 1 Factory Fan Cycling Settings
in Unit Controller (Units with 4 fans)
Description On (PSIG) Off (PSIG)
Fan Cycling Stage- 1 180 130 Fan Cycling Stage- 2 200 150 Fan Cycling Stage- 3 220 170 Fan Cycling Stage- 4 240 190 Table 2
digital input. Its function is to protect the compressors against high discharge pressure. If this switch remains open for one second, then the unit controller will switch off the corresponding refrigerant circuit and generate High Discharge pressure alarm.
High Pressure Switch
This switch is fi tted in the discharge side of each refrigerant circuit and is wired to the unit controller
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Display Information
SKM Pacvs series package units offer LCD display which allows the operator to access different parameters of the unit. Operator can view and change the unit parameters. The display information includes: • Status • Outputs • Inputs • Alarms • Set points • Password
System Protection
The intelligent microprocessor based controller monitors all the safeties related to the unit and makes the necessary protections,by shutting down the entire unit or the effected circuit. The protection includes
• Low suction pressure. • High discharge pressure.
• High compressor motor temperature. (For
compressors with internal motor protector). • Compressor short cycling.
• Evaporator fan motor overload
BMS Connectivity (Optional)
Volt free contacts for run status, common fault status, auto mode status and provision for remote on/off shall be provided as option if required. In addition, the PACVS microprocessor can support the major BMS protocols such as BACnet, Modbus & LON. Extra hardware may be required depending on the protocol.
Room Unit
The controller comes with a loose supplied sleek and elegant design room unit for installing in the conditioned space. Communication between unit controller and room unit is through two wire interface. The communication cable should be 2 core, twisted pair, unscreened with stranded conductors, as per KNX specifi cation. Maximum distance between room unit and controller can be 700 meters. The room unit has a built in sensor for measuring the room temperature. It transmits room temperature, set point, unit operating mode etc. to the unit controller. Control of the compressors is based on room temperature and the set point, as standard. If unit control needs to be based on duct temperature, please specify during time of order.
Room unit display (Operator Controls)
ON/OFF Button for unit power on or unit power off
Program
Button for Time scheduler, pressing this button allows date/time setting, while holding it allows schedule programming
Minus
Button for set-point adjustment, each operation of the Minus (-) button reduces the set point by differential which is defined in controller’s setting
Plus
Button for set-point adjustment, each operation of the Plus (+) button increases the set point by differential which is defi ned in controller’s setting
OK
Button for confi rmation of date/time and scheduler settings. Long press of this button can toggle between measurement units -oC and oF Fan Button for fan mode either continuous mode or auto mode
Mode
Button for unit mode: Cool, heat, ventilation and or cool-heat auto changeover (*Cool-Heat is available only if heat mode is applicable)
Control or data communication cables should not be routed along with power cables. Suffi cient distance is to be maintained while routing the cables between Power and data communication cables (If any).
Room Unit Installation
Installation must be carried with unit power off.
Table 3
A brief description of each button in the room unit is shown in table below:
Figure 1
Figure 2
Step Two: Remove back cover
Open the back cover of the room unit as shown using a screwdriver.
Step Three: Back plate Wiring
Install wiring into terminal blocks as indicated, and push slack wire back into wall or junction box.
The communication cable between room unit and microprocessor controller should be 2 core, twisted pair, unscreened with stranded conductors (As per KNX Specifi cation). Maximum distance between room unit and controller can be 700 meters.
Step Four: Cover Installation
Install cover plate as shown. Cover plate may be removed using a screwdriver as needed to access the terminals for wiring.
The room unit is not protected against accidental connection to AC 230 V The microprocessor controller & room unit include electrical and electronic components and must not be disposed off as domestic waste. Current local laws on disposal of electronic waste are to be observed.
Step One: Location and Mounting
Select a mounting location with good air circulation away from ventilation inlets, doors, windows, or other fresh air entry points or near direct heat sources. For room installation, the room unit should be mounted at least 4-1/2 feet above the fl oor. Avoid direct sunlight and draught. Admissible ambient conditions are to be observed.
The room unit is designed for semi-fl ush surface mounting with recessed conduit box. Cable entry is through the rear of the unit. The unit comprises front housing and rear housing.
These can be locked together and released by snap mechanism. Both the housings are plastic. Use the back plate as a template for locating holes for screws and wiring. Mount the back plate using screws provided. Wall anchors are recommended for drywall installations.
| 13
Use all lifting points. Improper lifting can cause severe personal injury and property damage.
a. Support the unit well along the length of the base rail b. Level the unit (no twists uneven ground surface) c. Provide proper draining around the unit to prevent
fl ooding of the equipment
d. Provide adequate protection from vandalism, mechanical contact, etc.
e. Securely close the doors
f. Cover the supply and return air openings an limits without isolation dampers.
• Rigging holes are provided on the sides of the unit. • Avoid twisting or uneven lifting of the unit
• The cable length from bracket to the hook should always be longer than the distance between the outer lifting points. • If the unit is stored at the construction site for an intermediate
period, follow these additional precautions:
Handling
Receiving of Equipment
Responsibility should be assigned to a dependable individual at the job site to receive material. Each
shipment should be carefully checked against the bill of lading. The shipping receipt should not be signed until all items listed on the bill of lading have been accounted for.
When uncrating, care should be taken to prevent damage. Heavy equipment should be left on its shipping base until it has been moved to the fi nal location.
Check carefully for concealed damage. Any shortage or damages should be reported to the delivering carrier. Damaged material becomes the delivering carrier’s responsibility, and should not be returned to the manufacturer unless prior approval is given
to do so.
The packing list included with each shipment should be carefully checked to determine if all parts and equipment have been received. Any accessories such as starters, contactors or controls should be fastened to the basic unit to avoid loss and prevent possible interchanging with other
units.
Make sure that wiring diagrams and IOM manuals are available within the equipment control panel.
Rigging
• Regardless of the packaging
used in transporting of the units, it should preferably be lifted with a fork lift truck or a crane and belts. The units should be unpacked as close as possible to its fi nal installation position. The unit should always be left standing upright. • Before positioning the unit, it is advisable to
re-check the weights.
• Remove the wooden pallet from underneath the machine before installation
• Use protectors to prevent sling or cable as per Figure 3-4.
• All protection/spreader bars shown in the rigging illustration should be provided by the customer on site. WOODEN PIECE HOOK SLING SHACKLE WOODEN PIECE SPREADER SHACKLE 4No.EQUAL SLING HOOK Figure 3 Figure 4
Storage
Single Unit Installation
Table 4
Location and Space Requirements
When the PACV-S units need to be stored in a prolonged period prior to installation, the following protective measures are required:
• Units must be stored in a protected area and
safe from construction debris. Do not remove the wooden coil guard.
• Check the pressure in high pressure side of
refrigerant circuit to confi rm that the refrigerant charge is intact in every three months. Take note of the ambient while checking. Contact SKM After Sales Offi ce or SKM sales representative. • Keep the liquid line Shut Off valve closed. When selecting a location for the unit, the following points should be considered:
• There should be enough space for air movement beside the condenser coils which should be approximately equal to the height of the coils. • The discharged air from the condenser fan should
not be obstructed by any roofi ng, ducting etc which could cause air short circuiting.
• There should be suffi cient area provided to enable for the servicing of the unit.
The schematic shown in Figures 5-9 gives the recommended clearance areas around the unit for both maintenance and air fl ow.
A B C 51008-S 61009-S 51010-S 61012-S 51014-S 61018-S 52015-S 62018-S 51017-S 61020-S 52017-S 62020-S 52020-S 62024-S 52023-S 62028-S 54 52026-S 62033-S 52030-S 62036-S 52032-S 62037-S 52038-S 62046-S 52045-S 62055-S 52050-S 62060-S 52055-S 62066-S 86 52065-S 62076-S 78 53070-S 63085-S 53075-S 63090-S 53080-S 63095-S 53085-S 63100-S 108 53090-S 63105-S 114 53095-S 63110-S 121 54100-S 64120-S 124 54110-S 64130-S 128 54115-S 64136-S 134 54125-S 64145-S 142
ALL DIMENSIONS ARE IN INCHES
72 78 72 82 66 96 104 78 108 PACV-S 50 52 -84 60 66
SPACING FOR SERVICE
DU C T A B A PACV- 51008 S TO 52055 S PACV- 61009 S TO 62066 S Figure 5
SPACING FOR AIR FLOW
[1981]78 A A PACV- 62076 S PACV- 52065 S DUCT B DUCT Figure 6 [1165]46 A* B A* PACV- 63085 S TO 64145 S PACV- 53070 S TO 54125 S DUCT DUCT
SPACING FOR BOTH AIR FLOW AND SERVICE
*
Figure 7 Figure 8 DUCT C DUCT B
p
SPACING FOR SERVICE SPACING FOR AIR FLOW
PACV- 61009 S TO 62066 S PACV- 51008 S TO 52055 S
| 15
Multiple Units Installation (Modular
Construction)
t.
Recommendations
It is a necessity that the units are installed with adequate free space around them to ensure proper circulation of air that is rejected by the condensers and to provide adequate space for unit access for servicing and
maintenance. There is a possibility of recycling of air if the rejected air from condenser encounters any obstacles leading to an increase in the ambient air
temperature surrounding the units.
Air distribution across the entire heat exchange area will be impaired if the air outlet is obstructed. These conditions lead to a reduction in the
heat exchange capacity of the coils causing an increase in discharge pressure of the compressors. This leads to a loss of capacity &
increase in compressor power input
Units should not be completely shrouded with higher uninterrupted wind shield in order to prevent reversing of air fl ow. In case, such a confi guration cannot be avoided, a properly designed exhaust duct or hood that does not infl uence any additional pressure a properly designed exhaust duct or hood that
does not infl uence any additional
pressure on the fans and which of the same hight as surrounding shield to be installed. PACV- 51008 S TO 52055 S PACV- 61009 S TO 62066 S DU CT DU C T B
• If there are walls on one or two adjacent sides of the unit. The walls may be of any height. If there are walls on more than two adjacent sides of the unit. The walls should not be higher than the unit.
• Do not locate outside air intakes near exhaust vents or other sources of contaminated air.
• If the unit is installed where windy conditions are common, install wind screens around the unit.
• Units surrounded byscreens or solid walls must have no over head obstructions over any part of the unit.
• The area above the condenser must be installed unobstructed to allow vertical air discharge.
• A fl at concrete foundation or fl oor which can support the weight of the equipment must provided as the unit must be level for proper operation and functioning of controls. • Under certain critical conditions it is recommended that
vibration isolators of rubber-in-shear or spring type be installed under the base refer to loading points (Page 49).
Electrical
Pre-Installation Check-Up
IMPORTANT: When installing the unit, always disconnect the electric supply.
• Make sure that the power supply is compliant with current safety standards. Always install the air conditioner in compliance with current local safety standards.
• Verify that suitable grounding connection is available. • Verify that the voltage and frequency of the power supply
comply with the specifi cations and that the installed power is suffi cient to ensure the operation of any other domestic appliance connected to the same electric lines.
• Verify that the air conditioner is connected to the power supply in accordance with the instructions provided in the wiring diagram included in the manual.
• Verify that electric connections (cable entry, section of leads, protections....) are compliant with the electric specifi cation and with the instructions provided in the wiring scheme. Verify that all connections comply with the standards applicable to the installation of air conditioners.
Figure 9
Foundation
A fl at level concrete foundation which can support the weight of the equipment must be provided.
Where units are to be located, over steel trusses or on a steel platform, careful analysis to ensure proper distribution of weight onto the structural members should be ensured. The steel platform should be strong enough to hold the operating weight.
Avoid installing the equipment in the following:
• In areas where it is exposed to direct sunlight. Close to any heat source.
• In damp areas or locations where it could come into contact with water.
• In areas where curtains and furniture could affect the supply and discharge of air.
• In areas in which there is no
enough space around the unit. (Must install as per the required/ recommended spacing, shown in the lay out drawings).
• On surfaces that are unable to
support the weight of the unit without deforming, breaking or causing vibrations when the unit is running.
General
Do NOT install the equipment in a location where it will come in contact with the following elements :
• Combustible gases
• Saline air
• Machine oil
• Sulphide gas
• Special environment conditions, if you must install the unit in such conditions, fi rst consult SKM.
Carrying Out Installation
1. Unpack the unit carefully.
2. Unfasten or dismantle transport locks.
3. Packing material to be fully removed and disposed. 4. The unit base frame must be fi xed without stresses to the
supporting structure.
5. AVM to be regularly placed around centre of gravity and fi rmly fi xed. Check whether AVM is balanced under load. 6. No forces or vibrations may be transferred from other plant
parts.
7. The fl exible connections at intake and/or discharge should be installed, well aligned and freely moving.
8. The AVM should be freely moving and under even load. 9. The impeller should be turning idly and should not touch
the intake cone.
10. The stability against collapse of the unit should be checked.
Preparation For Installation
When deciding on the location of the unit with the owner, the following restrictions must be taken into consideration:
The discharge air from the condenser fan should not be obstructed by any roofi ng, shelter, ducting etc. Any obstruction will cause short circuiting of condenser fans leading to reduction in capacity or nuisance tripping of the PACV-S package unit from the high pressure control and sometimes in motor burnout .
Condensate Draining
It is mandatory to install a properly sized drain trap in order to ensure proper draining of condensate collected in the drain pan. Below mentioned are recommendations for sizing a drain trap. Measure the maximum negative static pressure upstream from the fan. The height “H1 ” shown in below fi gures must be greater than or equal to the negative static pressure at design conditions. Ensure that there is suffi cient water in the trap before starting in order to maintain the seal.
H1= 1” for each 1” of negative static pressure + 1” H2= H1/2
H= H1 + H2+ Pipe Diameter + Insulation
Condensate traps serving the cooling coils should be of suffi cient height to be effective.
The unit should be located on a suitable base to provide adequate height from the ground in order to accommodate the drain trap.
| 17
Pre-Startup Procedure
After the installation has been completed, the following points should be covered before the system is placed in operation.
Precaution: Carry out a fan test run
Risk of injury from rotating impeller!
Never reach into the impeller when the fan is in operation.
a. Check electrical connections. Be sure they are all tight.
b. Observe compressor oil level before start-up. The oil level should be at or slightly above the center of the sight glass. Use only oil approved by compressor manufacturer.
c. Remove or loosen shipping retainers under motor- compressors. Make sure hold down nuts on spring mounted compressors are not touching the compressor feet.
d. Check high and low pressure controls, pressure regulating valves and all other safety controls, and adjust if necessary.
e. Check refrigerant used in the system. f. Wiring diagrams, instruction bulletins, etc
attached to PACV-S units should be read and fi led for future reference.
g. Make the proper refrigerant connections and charge the unit with the refrigerant to be used. Weigh the refrigerant drum before charging so an accurate record can be kept of the weight of refrigerant put in the system. h. Observe system pressures during charging and initial operation. Do not add oil while the system is short of refrigerant, unless oil level is dangerously low.
i. Continue charging until system has suffi cient refrigerant for proper operation. Do not over-charge. Remember that bubbles in a sight glass may be caused by a restriction as well as a shortage of refrigerant.
j. Do not leave unit unattended until the system has reached normal operating conditions and
Pre Startup Checklist
• Make sure the power supply voltage and frequency are as given in the unit name plate.
• Make sure that unit has been installed in accordance with the installation instruction and applicable codes. • Check all electrical connections in unit control panel;
tighten them as required.
• Make sure the compressor oil level is within the sight glass range.
• Check the power supply phase sequence for proper direction of rotation of motors.
• Make sure all system hand valves are in fully open position and system contains an operating charge of refrigerant.
• Switch on the power supply to the unit
• Crank case heaters of all compressors to be
energized at least 24 hours prior to start up.
PACV-S unit is factory charged
Please make sure to open supply air dampers fully (if any) before starting the fan motor. Otherwise, blower fan can be damaged due to back pressure and warranty will be void.
• Take measures to prevent centrifugal fan
from being switched on accidentally.
• Clear the ducting system and fan of all foreign bodies (tools, small parts, construction waste, etc.).
• Close all the inspection openings.
• Switch on fan and check direction of rotation of impeller by comparing it with the arrow on the fan indicating the direction of rotation. • If the direction of rotation is wrong, reverse
the polarity of the motor having due regard to the safety instructions.
• Once operating speed has been reached
measure the current consumption and compare it with the nominal motor current on the fan type plate or motor rating plate. • If there is continuous overload switch the
centrifugal fan off immediately.
• Check that the fan runs smoothly and quietly. Ensure that there are no unusual oscillations or vibrations.
• Check the motor for any abnormal noises.
Prior to starting up the unit, we recommend checking if the following steps have been carried out:
the oil charge has been properly adjusted to maintain the oil level at the center of the sight glass.
If the state of the fan does not allow adapted action for repair it has to be put out of order immediately and to be replaced if required.
Operational Check-Out
After the system has been charged and has operated for at least two hours at normal operating conditions without any indication of malfunction, it should be allowed to operate over-night on automatic controls. Then a thorough recheck of the entire system operation should be made as follows:
a. Compressor manufacturer model and serial number. b. Equipment manufacturer model and serial number. c. Design operating temperatures.
d. Refrigerant and weight of charge.
e. Electrical service, volts, cycles, phase, wire size. f. Control circuit, voltage, breaker size.
g. Contactor or starter, manufacturer, model, size, part number.
h. Compressor motor protection(if available), type, size, part number.
i. Data on relays or other electrical components. j. Pressure control, type, size, model number, setting. k. Data on miscellaneous components such as pressure
controls, crankcase heaters, solenoids, valves, etc. l. Liquid line drier, manufacturer, size, model number,
connections.
m. Schematic diagram of refrigerant piping.
n. Final settings on all pressure, regulating and safety controls.
o. Microprocessor details a. Check compressor head and suction
pressures. If not within system design limits, determine why and take corrective action. b. Check liquid line sight glass and expansion
valve operation. If there are indications that more refrigerant is required, leak test all connections and system components and repair any leaks before adding refrigerant. c. When applicable, observe oil level in
compressor crankcase sight glass, and add oil as necessary to bring level to center of the sight glass.
d. Thermostatic expansion valves must be checked for proper superheat settings. Sensing bulbs must be in positive contact with the suction line. Valves with high superheat settings produce little refrigeration and poor oil return. Too little superheat causes low refrigeration capacity and promotes liquid slugging and compressor bearing washout. Liquid refrigerant must be prevented from reaching the crankcase. If proper control cannot be achieved with the system in normal operation, a suction accumulator must be installed in the suction line just a head of the compressor to prevent liquid refrigerant from reaching the compressor.
e. Using suitable instruments, carefully check line voltage and amperage at the compressor terminals. If high or low voltage indicated, notify the power company. The current normally should not exceed 120% of the nameplate rating. If amperage draw is excessive, immediately determine the cause and take corrective action. On three phase motor-compressors, check to see that a balanced load is drown by each phase. f. All fan motors on air cooled condensers,
evaporators, etc should be checked for proper rotation. Fan motor mounts should be carefully checked for tightness and proper alignment. If belt drives are used, check the belt tension. All motors requiring lubrication should be oiled or greased as necessary.
Service Record
A permanent data sheet should be prepared on each installation, with a copy for the owner and the original for the installing contractor’s fi les. If any other fi rms are to handle service and maintenance, additional copies should be prepared as necessary.
The form of the data sheet may vary, but a complete record of sizes and identifi cation of all components used in the installation, together with any pertinent information should be included. Following is suggested check-off list:
| 19
Unit Start Up
Sequence of Operation
The unit may be enabled or disabled through the Run/ Stop toggle switch in the unit mounted control panel or
from the room unit on/off button. Control is based on room temperature sensed by room unit(for units with duct sensor ,control is based on duct temp). Evaporator fan motor
starts fi rst. Compressors will be staged based on the set point and actual room temperature. On an increase in room temperature, cooling stages will be added and on a decrease in room temperature, cooling stages will be removed from the system. Sequence for the
compressors and motors are as given below: • Switch on the three phase power supply to the unit. • Switch on the control circuit breakers. Unit controller
will start up.
• Check for any alarms in the controller. If there are any alarms, correct the cause and clear them. • Turn on the Run/Stop toggle switch in the unit
control panel.
• Press the power button in the room unit. Then
supply fan will start.
• Make sure the refrigerant circuits are enabled in the relevant circuit screen in the controller display. • Compressors will start based on the temperature set point set in the room unit and the indoor temperature. Make sure that the unit is in cooling mode, which can be selected from the room unit.
• Condenser fans will start with compressors and will cycle based on discharge pressure.
Supply Fan
Supply fan will be switched on if the below conditions are satisfi ed.
• Controller start up is fi nished.
• Run/Stop switch in the unit control panel is ON.
• Room unit power icon is ON. • Room unit schedule is ON (If schedule is
disabled, then unit will run continuously) • Communication between unit controller
and room unit is healthy. • Motor overload is healthy. • Voltage Monitor is healthy.
Supply fan has two modes; ON (continuously ON) or AUTO (ON when there is cooling or heating demand).
Compressor
Compressor will switch on if the below conditions are satisfi ed.
• Compressor minimum OFF time
completed.
• Supply fan runs for 30 seconds. • Circuit enable (from controller display)
is enabled.
• Unit is in cool mode.
• Demand for compressor is present. • Discharge pressure and motor protector
module (if available in compressor) are healthy. • If above are satisfi ed, solenoid valve will be opened
and when the low pressure switch closes, compressor will be started.
A typical two compressor control is as shown below:
Condenser fans
Condenser fans will switch on with associated compressor(s) and cycle based on discharge pressure.
• For single compressor units or units with circuits having independent condenser fans, condenser fans will be switched on based on the discharge pressure of that circuit. Each fan will switch on if pressure is above the stage on value and will switch of if the pressure is below stage off value.
• For units with more than one compressor sharing the condenser fans, the highest pressure among the circuits will be taken to cycle the fans.
Unit Controller Display and Keypad
The keypad/display of the controller consists of a 64 x 144 screen resolution 5 line 22 character display screen,3 buttons and a push & turn knob for navigation.
Buttons
Info button: This is used to enter the unit information screen
where the SKM Unit model & serial number can be viewed.
Alarm button: This is used to enter directly the alarm screen for
viewing the alarm details & to reset them manually if required.
Esc button: This is a back button to move back to the previous
screen or to the home screen.
Push & Turn Knob
This is a navigation wheel that can be rotated as well as pushed. Rotating the wheel navigates between the lines of the screen and also to change/edit the changeable values on the screen. Clockwise rotation increases the values and anti-clockwise rotation decreases the value. Pushing the wheel acts as an “Enter” button to acknowledge the changed value.
If supply fan is not starting, navigate to these screens to fi nd out the reason. In order for the supply fan to start, the Run/Stop input should be “Run”, Room Unit should be “On”, Schedule Status should be “On” in case the schedule is enabled, Motor over load should be “healthy” and Voltage monitor should be healthy.
Circuit Screen
Each circuit screen will show the status of all the inputs and outputs related to that circuit.
These will show the status of supply fan motor (On or Off), Circuit enable/disable selection, Unit mode (Cool, Heat, Auto or Vent), Discharge pressure (Healthy or Trip), Suction pressure (Healthy or Trip), compressor motor protectors if available (Healthy or Trip), compressors (On or Off) and liquid line solenoid valve (Open or Closed).
Note that circuit can be enabled or disabled from the controller display itself. In order to do that, highlight the Circuit Enable line and then press the navigation wheel. Then rotate the navigation wheel in order to enable or disable the circuit and then press the wheel.
Unit operating mode selection is from the Room unit.
Condenser fans
These screens will show the discharge pressures of each circuit and status of the condenser fans.
Schedule
The schedule screen will allow setting the On time and Off time for each day of the week. If the schedule is enabled, then unit will work based on this schedule only.
Set points
This screen will show the temperature set point and actual indoor temperature (or duct temperature if optional duct sensor is used).
If factory password is entered, then set points screen will show access to factory parameters as well.
The main display screen consists of a 5 line display, with the fi rst line displaying the page title and a numeric display of the number of alarms along with the symbol if any alarms are present. Second & third lines display the date & time respectively. There are three sub menus in the display namely, SYSTEM OVERVIEW, PASSWORD & ALARMS. Every page can consist of data fi elds, either changeable or with information only. As the cursor moves over each line, the text in the line is highlighted with a black box around it and the text turning white. As the navigation wheel is rotated the subsequent lines get highlighted with a black box around them. When a line consists of an arrow in the far right of the page, it is referred to as a menu group. When the navigation wheel is pushed, the display goes to a new page consisting of the submenus. The title of the menu group appears as the title of the new page.
Figure: Rotation of the navigation wheel
Figure: Pushing the navigation wheel
The system overview menu consists of information on the supply fan, circuits, condenser fans, and set points. These submenus give more information on the unit including safeties and status of compressors, motors and set points. Different screens of the controller are
as given below.
Main Screen
This screen will show date & time, system over view, password & alarms.
System Overview
Selecting the system overview will lead to below screens
From the above two screens, further navigation is possible to different screens which will give information about supply fan, each refrigerant circuit, condenser fans, schedule and set points.
Supply fan
The below screens will give information about all the inputs and outputs related to supply fan.
Display and Keypad operation
ct temperature if optional duct s
parameters as well. e
| 21
Factory parameters will show Compressor Minimum off time, Compressor Minimum On time, Low pressure alarm delay, Cooling step, Cooling Differential, Condenser Stage1 On pressure, Condenser Stage1 Off pressure, Condenser On Differential pressure, Condenser Off Differential pressure, Schedule enable/disable, Clearing alarm history and software BSP version of the controller.
Note that factory parameters should be changed only by SKM.
Unit Information
This screen will provide the information about the unit model name and SKM serial number.
Alarms
This screen will show alarm list and alarm history.
Pressing the alarm list will show all the active alarms. All alarms will be with date & time and will be in easily readable English language.
Note that some of the alarms (like high discharge pressure) are manual reset. In order to acknowledge the manual reset alarms, follow below steps.
• Below Screen will appear.
• Rotate the Navigation wheel and then screen will show
Exe...
• Press the navigation wheel and all the alarms which are not active will get reset.
List of Alarms in the Unit Controller
Below are the various alarms confi gured in the Unit controller. Supply Fan Motor: Trip
This alarm occurs when the overload of supply fan motor detects an overload condition in the motor. When this alarm happens, entire unit will be switched off. This alarm is auto reset as standard. Voltage Monitor: Trip
This alarm occurs when the voltage monitor connected in the main incomer detects an under voltage or over voltage or phase reversal or phase imbalance or single phasing condition. When this alarm happens, entire unit will be switched off. This alarm is auto reset as standard.
Room Unit Communication: Lost
This alarm occurs when the unit controller looses communication with the room unit. When this alarm happens, entire unit will be switched off. This alarm is auto reset as standard.
Circuit-# Suction Pressure: Trip
This alarm occurs when the low pressure switch senses a low suction pressure in the refrigerant circuit. This alarm will be generated, if one refrigerant circuit is On for cooling demand and the low pressure switch doesn’t close for a specifi c time (low pressure alarm delay set point). When this happens, corresponding circuit will be switched off and alarm will be generated. This alarm is automatic reset as standard.
Circuit-# Discharge Pressure: Trip
This alarm occurs when the high pressure switch senses a high discharge pressure in the refrigerant circuit. This alarm will be generated, if the high pressure switch remains open for one second. When this happens, corresponding circuit will be switched off and alarm will be generated. This alarm is manual reset as standard.
Compressor-# Motor Protector: Trip
This alarm will be generated only for those compressors with a built in electronic motor protector module. It occurs when the motor
g pp
• Enter the user password “1234” (Refer Passwords)
• Go to alarm list screen and press
• If the room unit address is not set correctly, it will display as below (“P- -” blinking).
Passwords
In order to enter the password, use Password screen. Follow the below steps.
• Go to the “Password” screen in the Main Menu.
• Use the navigation wheel to enter password (Rotate to change and Press to select.). If user password is required, enter 1234.
• Once the password is entered, a number
corresponding to the password level will appear on left top of the screen. For user password, it will be 4.
Operation of the Room Unit
The room unit displays indoor temperature (duct temperature if optional duct sensor is used), temperature set point, unit on/off status, unit operating mode, fan mode, day of the week, time of the day and schedule. Room unit will let the user to make the unit on/off, change the operating mode, change the fan mode, adjust the set point, change the temperature measurement unit, change date & time and operating schedule.
Adjust the set point, change the temperature measurement unit, change date & time and operating schedule.
• Press “power button”, “mode button”, “minus button” and “plus button” simultaneously as shown below.
Setting the address in Room Unit
• Room unit will display the software version as below.
• Press “mode button”; room unit will display parameter 001 as below, with 001 blinking
Passwords
In order to enter the password, use Password screen. Follow the below steps.
• Go to the “Password” screen in the Main Menu.
• Use the navigation wheel to enter password Use the navigation wheel to enter passw (Rotate to change and Press to select.). If user password is required, enter 1234.
• Once the password is entered, a number
corresponding to the password level will appear on left top of the screen. For user password, it will be 4.
Power Button
Minus Button
Mode Button
Plus Button protector module senses a high internal temperature
in the compressor. When this happens, corresponding circuit will be switched off and alarm will be generated. This alarm is automatic reset as standard.
