Norms and regulations... 4
Exhaust system and effective heat demand ... 4
Modern conception ... 4
Useful design... 4
Universal use ... 5
Two-stage Operation ... 5
Easy Installation ... 6
Instructions for using the burner ... 6
Leak test... 6
Rating of the gas ramps ... 7
Gas compact ramp Rp 1“ and Rp 1¼“ ... 7
Gas compact ramp Rp 1½“ and Rp 2“ ... 8
Gas compact ramp DN 65 to DN 100... 8
Gas ramps GZ 3 liquid gas ... 8
Setting of the switches in the motor valve connection box... 8
Gasburner and Gas ramps assembly GZ 2 - GZ 4 ... 9
Table of basic settings and dimensions GZ 2 - GZ 4 ... 9
Adjusting the burner... 10
Position air guidance device GZ 3 and GZ 4... 11
Air inlet nozzle... 11
Settings ... 12
Spark electrode setting ... 12
Installation position Multiblock... 12
Fault diagnosis... 13
Fault diagnosis MMI 810... 13
Fault diagnosis TMG 740-3 and TMG 740-2... 14
Troubleshooting ... 15
Burner dimensions ... 17
Connections ... 18
Boiler connections ... 18
Electric supply diagram ... 18
Assembly with silencer hood for GZ 3 and GZ 4 ... 18
Circuit diagramm GZ 2... 19
Circuit diagramm GZ 3.0... 20
Circuit diagramm GZ 3.1 - GZ 3.3 ... 21
Circuit diagramm GZ 4... 22
Maintenance and service... 23
Guarantee ... 24
Spare parts ... 24
Manufacturer's certificate ... 25
Please comply with the assembly, operation and maintenance instructions for installing and adjust-ing the gas burner!
In Switzerland, the guidelines issued by PROCAL and those of the Vereinigung Kantonaler Feuerver-sicherungen, VKF (Association of Canton Fire Insurances) must be observed, in particular the fire guidelines "Thermal Heating Systems".
Please read this installation manually carefully before starting installation. We cannot assume any liability or guarantee for damage caused by failure to comply with this installation manual! Work which is not carried out properly can cause injury to persons or damage to property!
Work on the heating system y Installation, commissioning, maintenance and servicing work may only be carried out by an authorised firm of heating con-tractors.
When working on burner and boiler y switch off the heating system emergency switch and secure it to prevent it being switched on again.
y shut off the oil feed pipe and secure it to prevent it being opened unintentionally.
This symbol refers to instructions which must be heeded for your own safety and that of other people, and to avoid damage to property.
This symbol refers to instructions which must be heeded for the gas burner to operate safety and function correctly. It also draws attention to statutory regulations which need to be observed.
Norms and regulations
The following standards and regulations are to be observed during installation and operation of the burner.
HeizAnlV
Heating system ordinance FeuVo
Firing ordinance of the German federal states 1. BImSchV
First ordinance for implementation of the German Emission Pro-tection Law
VDI 2035
Guidelines for preventing damage from corrosion and scale formation in hot water heating installations
VDE
Regulations and special requirements issued by the energy util-ity companies
EN 303, part 1 and part 2
Heating boilers with forced draft burners EN 60335, part 1
Safety of household and similar electrical appliances DIN 4705
Calculating the dimensions of chimneys DIN 4751
Hot water heating installations – safety requirements DIN 4755
Oil firing installations – construction, execution, safety require-ments
DIN EN 267
Automatic forced draught burners for liquid fuels – definitions, requirements, construction and testing
DIN 51603, part 1 Fuel oils extra light DIN 57116
Electrical equipment of firing installations
Please comply with the valid regional building code.
Exhaust system and effective heat demand
Boiler, burner and exhaust system (chimney) constitute an oper-ating unit; account must be taken of low exhaust temperatures when reducing the output
For exhaust temperatures below 160°C, the system must be de-signed so as to avoid damage from condensation.
The uncondensed (humid) flue gas volume is an important indi-cation of the size of the flue gas installations an chimneys re-quired.
It is advisable to install draft limiters (supplementary air sys-tems) to achieve stable combustion values under varying condi-tions and to reduce possible humidity in the chimney. These should be installed in the chimney where possible, to avoid pos-sible noises in the flue pipe.
Modern conception
The gas burners in the GZ 2 - GZ 4 series are fully automatic two-stage burners in monobloc design. They are suitable for natural gas and liquefied gas according to DVGW paper G 260, designed according to DIN 4788, and tested according to DVGW and CE.
The burners are equipped with automatic gas firing units for in-termittent operation as per DIN EN 298 or DIN 4788; automatic gas firing units for continuous operation on request.
The GZ 2 - GZ 4 gas burners are pressurised burners with very high impeller pressing and a steep impeller characteristic line. Because of these features and the variable adjustment of the air admission nozzle, these burners are appropriate for modern high-performance boilers with reversible flames as well as for older natural draught boilers. The modern conception of the two-stage GZ 2 - GZ 4 burners with a maximum output range of 50:100% (GZ 2 - GZ 3) or 60:100% (GZ 4) guarantees ideal graduation of the two load-stages depending on operating conditions.
Useful design
Diecasting light metal case, power-dependent burner pipe and high-performance mixing system, adjustable air admission noz-zle and air damper servomotor for two-stage operation, A.C. motor (GZ 2 - GZ 3.0) or threephase motor (GZ 3.1 - GZ 4), ig-nition transformer, fan impeller, gas compact ramp (GZ 2 - GZ 3.0) or gas ramps assembly (GZ 3.1 - GZ 4), air pressure switch, automatic firing sequence control with infrared flame detector (GZ 2 - GZ 3) or ionisation flame control (GZ 4), internal plug connections and plugs according to DIN 4791, mounting flange with gasket and fastening screws.
Universal use
The adjacent diagram depicts the approximate performance range of the different burner sizes as a function of the resis-tance measured at the boiler's gas exit during operation. The curves show maximum values and correspond with the model certification according to DIN 4788.
The starting resistance of the boiler is of decisive importance to the attainable burner performance.
Fig. 1: Performance diagram GZ 2
Fig. 2: Performance diagram GZ 3
Fig. 3: Performance diagram GZ 4
Two-stage Operation
The use of a modern, symmetrically designed high-performance mixing system in conjunction with precisely functioning adjust-ment at the compact gas ramps (GZ 2 - GZ 3.0) or at the gas ramps assembly (GZ 3.1 -GZ 4) makes it possible to adjust out-put precisely to heating requirements, resulting in optimum en-ergy utilisation in both load stages with low-emission combus-tion.
Two-stage operation is controlled by the air damper servomotor which adjusts the air flow for the two load stages and switches the gas solenoids in the compact gas ramps (GZ 2 -GZ 3.0) or gas ramps assembly (GZ 3.1 - GZ 4) by adjustable cam control-lers.
Easy Installation
The burner comes complete, including power dependent equipment, and every component is clearly designed so that a qualified heating engineer will have no problems with Installa-tion, starting, and servicing.
Screws and gaskets for the burner installation are included. The burner is electrically connected by a 7-pole plug according to DIN 4791.
The burners are pre-tested and pre-set. The burner performance is changed by adjusting the gas-flow throttle and the settings (dimension B and air damper position).
In Germany, the heating engineer has to consider the existing regulations of the DVGW (e.g. TRGI or TRF) and the local utility companies.
General note as per DIN EN 676: This burner must be installed in compliance with the valid specifications and must only be operated in well aired rooms. The instructions before installing and operating the burner must be observed.
The engineer must ensure that the heating room is suitably ven-tilated with an air exchange rate of at least 100 m³/h. The gas pipes must be installed and connected by an authorised heating engineer. The weight of the gas compact ramps or assembly must be supported by a suitable bracket.
The length of pipe between the gas ramps and the gas burner must not exceed max. 800 mm (for GZ 2 and max. 500 mm for GZ 3.0).
The VDE and EVU specifications must be observed when install-ing the electrical connections.
The burner must be connected with a flexible cable. Do not in-terchange the phase (live!) and neutral wires
As a result of the new master firing ordinance, some German states stipulate the installation of thermally influenced gas stop valves.
Fig. 4: Gas-Gebläsebrenner GZ 3
Instructions for using the burner
The burners GZ 2 – GZ 4 are basically suitable for use in com-mercially available heating boilers (intermittent operation) for heating residential buildings and for service water. Product de-velopment and the test procedures have been geared to the operating conditions of these systems.
The areas of application listed below make particular requirements with special operating conditions for the burner, so that MHG Heiztechnik reserves the right to is-sue explicit approval in these cases:
y dark radiators y baking ovens y annealing furnaces y drying chambers y industrial applications
MHG Heiztechnik should also be consulted for instal-lations with above average firing chamber or tem-perature loads.
In the case of rooms where the air must be expected to be contaminated by halogenated hydrocarbons, e.g. hairdressers, printers, chemical dry cleaners, laborato-ries etc., the burners must only be operated if suitable measures are taken to ensure that there is an adequate sup-ply of uncontaminated combustion air.
Always consult MHG Heiztechnik if in any doubt.
The burners must not be operated in rooms with high dust levels or high humidity (e.g. laundries). The heat-ing room must be protected from frost and well aired.
Failure to comply with these instructions renders the warranty null and void for any damage resulting from one of these causes.
Leak test
A programme-controlled leak detector which checks the sole-noids for leaks can be installed simply and retroactively. An ad-ditional electrical connection at gas compact ramps is not nec-essary. The leak lest provides additional security for the users of gas firing systems. This feature is generally recommended, and is a stipulated-requirement for burner outputs of 1200 kW and more.
Rating of the gas ramps
Depending on the available gas flow pressure, a correspond-ingly rated gas compact ramps or gas ramp system will be in-stalled in the factory.
If the minimum connection pressure is not achieved under rated heat load, a gas ramp system will have to be used with a larger rated width; the gas pressure must be increased at the utility company's gas transfer point, or the cross section of the supply line between the gas transfer point and the gas ramp system must be enlarged.
Before the gas fan burner starts up for the first time, vent the gas pipe and then check the gas ramps for leaks.
Gas compact ramp Rp 1“ and Rp 1¼“
Burner and gas ramps taken from the table on page 9 form a complete unit , which has been subject to model certification. The conventional arrangement of the gas ramps is designed as an operational compact unit.
• Dirt pan with sieve and filter mat
• Pressure controller with admission pressure compensation and zero closing
• Pressure detector, setting range 2.5 - 50 mbar, blocked when liquefied gas is used
• Safety solenoid, opens and shuts quickly
• Two-stage solenoid, opens slowly, shuts quickly, adjustable starting volume, stage 1 and 2
• Mounting flanges with measurement nipple • Electrical connection with plug
Supply-pressure up to max. 360 mbar
{Comply with the Technical Rules for Gas Installations (DVGW-TRGI) }
Gas compact ramp Rp 1½“ and Rp 2“
Burner and gas ramps taken from the table on page 9 form a complete unit which has been subject to model certification. Key parts are:
• Dirt pan with sieve and filter mat
• Safety solenoid, opens and shuts quickly, with setting for gas volume stage 2
• Solenoid with setting for starting volume and gas volume stage 1 , opens slowly and shuts quickly
• Pressure controller with admission pressure compensation and zero closing
• Pressure detector, setting range 2.5 - 50 mbar • Electrical connection with plug
Supply-pressure up to max. 360 mbar
Gas compact ramp DN 65 to DN 100
Burner and gas ramps taken from the table on page 9 form a complete unit which has been subject to model certification.
Fig. 6:
Key parts are:
• Dirt pan with sieve and filter mat
• Safety solenoid, opens and shuts quickly, with setting for gas volume stage 2
• Motor valve with setting for gas volume stage 2, opens slowly and shuts quickly
• Pressure controller with admission pressure compensation and zero closing
• Pressure detector, setting range 2.5 - 50 mbar • Electrical connection with plug
Supply-pressure up to max. 200 mbar
Gas ramps GZ 3 liquid gas
• Pre-adjustment
Type Gas solenoid level 1 (partial quantity) Gas solenoid level 2 (main quantity)
GZ 3.0 opened approx. ¾ turn opened approx. ½ turn
GZ 3.1 opened approx. 2¾ turn opened approx. 1¾ turn
GZ 3.2 opened approx. 1½ turn opened approx. 1¼ turn
GZ 3.3 opened approx. 1¾ turn opened approx. 1½ turn
-
Set pressure switch to approx. 20 mbar-
Open start gas quantity 1 turnIt is vital for the stated basic settings (see page 9) to be met for liquid gas operation!
Setting of the switches in the motor valve
connec-tion box
Gas-burner and gas ramps assembly GZ 2 - GZ 4
Burner-
type Gas type
Burner order number
Suitable for boiler performance kW Gas flow pressure mbar Rated with 2) DN Order number Total weight
kg
GZ 2.1 Natural gas H (L,LL) 3) Liquefied gas -1001 -1008 100 - 200 28 26GZ 2.2 Natural gas H (L,LL)Liquefied gas 3) -1002 -1018 180 - 300 28 26
GZ 3.0 Natural gas H (L,LL)Liquefied gas 3) -3085 2) 260 - 315 20
50 Rp 1¼“ 1) 50 GZ 3.1 Natural gas H (L,LL) 3) Liquefied gas -3175 2) 315 - 500 25-50 50 Rp 1½“ -3044 67
GZ 3.2 Natural gas H (L,LL)Liquefied gas 3) -3275 2) 450 - 650 25-50 50 Rp 2“ -3054 73
GZ 3.3 Natural gas H (L,LL)Liquefied gas 3) -3305 2) 550 - 810 25-50
50 Rp 2“ -3054 74
GZ 4.1 Natural gas H (L,LL)
3)
Liquefied gas -4105 -4108 700 - 1020 35-50 50 DN 65 -4065 173
GZ 4.2 Natural gas H (L,LL)Liquefied gas 3) -4205 -4208 900 -1450 25-50 50 DN 80 -4080 201
1) included in burner order number
2) It is vital for the stated basic settings (see page 8) to be met for liquid gas operation!
Table of basic settings and dimensions GZ 2 - GZ 4
Gas flow rate Air pressure Nozzle pressure Burner-
type Gas type
Suitable for boiler performance kW Stage 1 m3 /h Stage 2 m3 /h Dim. A mm Dim. B mm Dim. D
mm Stage 1 mbar Stage 2 mbar Stage 1 mbar Stage 2 mbar Air supply nozzle GZ 2.1 Natural gas H (L,LL) 3) Liquefied gas 100 - 200 10 4 5,5 14 18 50 57 95 2 3 7 8 13 6 10 16 9,5 7,5
GZ 2.2 Natural gas H (L,LL)Liquefied gas 3) 180 - 300 16 6 23 9 18 70 110 2,5 5 7 11 5 20 9 9,5
GZ 3.0 Natural gas H (L,LL)Liquefied gas 3) 260 - 315 7,6 19 13,8 32 23 75 110 65 3,4 1,2 7,2 7 5,5 2,2 11,7 10 0
GZ 3.1 Natural gas H (L,LL) 3)
Liquefied gas 315 - 500 9,5 26 43,5 15 20 25 135 88 126 130 3,5 2 11,5 6 4,8 3,5 12 9 7,5 1,5
GZ 3.2 Natural gas H (L,LL)Liquefied gas 3) 450 - 650 39 14 65 25 20 27 120 145 118 5,5 1,5 11,5 9 4,2 2,5 9,5 11 7,5 2,5
GZ 3.3 Natural gas H (L,LL)Liquefied gas 3) 550 - 810 53 16 75 28 27 117 120 145 3,5 2 10 9 6 3 11,5 13 3,5 8
GZ 4.1 Natural gas H (L,LL) 3)
Liquefied gas 700 - 1020 24,8 58 33,1 91 33 125 130 175 13,5 9 18,5 17 6,5 12 16,5 14 1,5 2
GZ 4.2 Natural gas H (L,LL)Liquefied gas 3) 900 -1450 27,9 85 46,5 125 33 130 141 175 10,5 7,5 17,5 17 5 11 9 1,5 2
3) For operation with natural gas (L, LL), only the gas quantity is increased. The output-related basic setting does not have to be changed. Power
Adjusting the burner
Every burner is pre-tested and pre-set. The basic adjustment is shown in the table above (reference values valid for the gas type indicated).
The burner must be adjusted and started by a qualified heating engineer.
Adjusting the gas flow range:
• gas pressure (nozzle pressure): at the adjusting screw of the gas pressure controller 2
increased gas pressure decreased gas pressure
• gas volume stage 2 - at the adjustment for valve 3 less gas
more gas
• gas volume stage 1 - at the adjusting wheel of solenoid stage 1 4
less gas more gas
• for gas ramp systems DN 65/80/ 100 at the motor valve 4 (Johnson Controls see illustration on the left)
• starting gas volume - at the adjusting screw of valve 1 1 opening quickly
opening slowly
• The gas pressure detector is to be set to the flow pressure at which perfect function of the gas burner is still possible. There are three possible ways of adjusting the combustion air:
a. by adjusting the air supply nozzle according to burner
out-put and local conditions:
• position 0 - 5 (0 -1) for natural draught boilers • position 6 - 9.5 (2 - 4) for counter-pressure boilers
b. by adjusting the baffle plate in the burner tube (see fable
with basic settings); this adjusts the air velocity in the combustion head together with the flame shape to the combustion chamber conditions
c. by adjusting the air damper for the 1st and 2nd stage
us-ing the (blue) cam controller for stage 1 and (orange) for stage 2; the air volume is reduced to the left and increased to the right. An inadequate air volume in stage 1 is ad-justed as follows:
• adjust the (blue) cam controller up-wards (more air) • briefly switch over to stage 2 at boiler thermostat 2. After
switching back, the servomotor turns back into the required position.
When the air volume is too large in stage 1 or too small in stage 2, the corresponding cam controller must be adjusted. To re-duce an excessive air volume, the (orange) cam controller must be adjusted accordingly and the servomotor is closed by switch-ing the controller for the second stage or by disconnectswitch-ing the green 4-pole plug, then start up again in the operation setting. The switching point for the second solenoid (stage 2) or motor valve can be changed using the long black cam controller. When switching the burner off for regular servicing or to elimi-nate faults, the air damper can be closed using the (short black) cam controller of the servomotor. It is advisable to measure the air pressure before the baffle plate to check the setting (see ta-ble values for air pressure). The measuring point is located next to the gas supply pipe on the flange cover.
Position air guidance device GZ 3 and GZ 4
Fig. 9:
Air inlet nozzle
Fig. 10: Adjusting the air inlet nozzle for GZ 2 / GZ 3
The air inlet nozzle can be adjusted once the burner has been opened. Both screws on the air inlet nozzle should be loosened slightly, and must be screwed tight again after the adjustment has been made.
Fig. 11: Adjusting the air inlet nozzle for GZ 4
The air inlet nozzle can be adjusted once the burner has been switched off and the suction silencer has been hinged away. Both screws of the air inlet nozzle should be loosened slightly, and must be screwed tight again after the adjustment has been made.
Settings
Fig. 12:
Spark electrode setting
Fig. 13:
Installation position Multiblock
All gas Multiblocks must only be installed as shown below
Installation in the grey area is not permitted.
Fig. 14:
GZ 4 liquefied gas GZ 4 natural gas GZ 2
Fault diagnosis
Flame monitoring makes use of the conductivity and rectifier effect of the flame, by means of an ionisation electrode. The flame signal amplifier only reacts to the DC component of the flame signal.
A short circuit between ionisation electrode and earth causes a fault cutout.
MMI 810.1 UN = AC 230 V mains voltage necessary sensor current for reliable
operation > 5 µA
Fig. 15: Legend measuring circuit
FE Ionisation electrode
M Multimeter
Fig. 16: Position ionisation electrode GZ 2
Ionisation current in operation: GZ 2: 15 - 22 µA
Fault diagnosis MMI 810
Fault Remedy
Burner does not start, program display re-mains the same
• Faulty electric lead • Thermostat or gas switch
"OFF"" Burner does not start,
program display turns constantly
• Air pressure switch not in idle position (working contact must be open)
• Connection terminal 1 – terminal 9 interrupted
• Operating voltage < 180V Automatic unit shows a
fault just after starting pre-venting (line in blue box)
• Air pressure switch contact does not close
• No load at terminal 5 • Flame signal
Automatic unit shows a fault during pre-venting (blue area)
• Air pressure switch contact opens
• Flame signal Automatic unit shows a
fault during the safety period (yellow area)
• No flame formed (faulty ignition, valve does not open, etc.) • No or weak flame signal (flame
does not hold, poor insulation of flame sensor, burner not cor-rectly connected to earth con-ductor)
Automatic unit shows a fault during operation setting (red or green area)
• Flame breaks off
• Air pressure switch contact opens
Fault diagnosis TMG 740-3 and TMG 740-2
Fault Remedy
Burner does not start, program display re-mains the same
• Faulty electric lead • Thermostat or gas switch
"OFF"" Burner does not start,
program display turns constantly
• Air pressure switch defect or not in idle position (working contact must be open)
Automatic unit shows a fault just after starting pre-venting (line in blue box)
• Air pressure switch contact does not close
• Flame signal Automatic unit shows a
fault during pre-venting (blue area)
• Air pressure switch contact opens
• Flame signal Automatic unit shows a
fault during the safety period (yellow area)
• No flame formed (faulty ignition, valve does not open, etc.) • No or weak flame signal (flame
does not hold, poor insulation of flame sensor, burner not cor-rectly connected to earth con-ductor)
Automatic unit shows a fault during operation setting (red or green area)
• Flame breaks off
• Air pressure switch contact o-pens
Troubleshooting
Check general operating status. Are the stated values met?
Störung Ursache Behebung
Burner does not work Check main switch, fuse, boiler thermostat
Check voltage (neutral and live wires) Check leak detector
Check gas pre-pressure
Check gas pressure detector (setting, function) Replace firing sequence controller
Burner Starts
Gas pressure and gas shown No ignition spark
Check ignition transformer, ignition cable and spark electrode setting
Replace firing sequence controller Burner works
Gas pressure shown Spark visible No flame
Air in the gas pipe
Flame detector could be exposed to another source of light
Burner works Gas pressure shown Spark visible Flame OK No ionisation current (GZ 2 + GZ 4) No infrared display (GZ 3) Fault cutout
Check connection of neutral and live wires Check gas flow pressure (fluctuating pressure gauge display = gas pipe too small or pressure controller defect
Set infrared flicker detector (IRD) (GZ 2 + GZ 4) to 7, check IRD's Position, replace IRD (GZ 3) Replace firing sequence controller
Burner does not start up, program display stays the same
Faulty electric lead
Thermostat or gas pressure switch off
Check electric leads
Replace thermostat or gas pressure switch Burner does not start up,
program display turns con-stantly
Air pressure switch defect or not in idle position
(contact must be open) Replace air pressure switch
Burner starts up, automatic unit shows fault just after starting pre-venting
Air pressure switch contact does not close Check wiring for air pressure switch
Fault Cause Remedy Burner starts up,
automatic device shows fault during pre-venting
Air pressure switch contact opens Flame signal
Check pulse lead
Check ionisation current [fault current?] (GZ 2 + GZ 4)
check infrared flicker detector IRD (GZ 3) Burner starts up,
automatic device shows fault during safety period
No flame formed (lacking ignition, valve does not open, etc.)
No or weak ionisation current (GZ 2 + GZ 4)
No or weak flame signal (GZ 3)
[Flame does not hold, poor insulation of flame sensor, burner not correctly connected to earth conductor]
Check pulse lead
Check ionisation current [fault current?] (GZ 2 + GZ 4)
check infrared flicker detector IRD (GZ 3)
Burner starts up,
automatic device shows fault during operation setting
Flame breaks off
Air pressure switch contact opens Ionisation current too low (GZ 2 + GZ 4) Flame signal too low (GZ 3)
Check pulse lead
Check ionisation current [fault current?] (GZ 2 + GZ 4)
check infrared flicker detector IRD (GZ 3) Safety warning!
The mains voltage must be switched off and the main stop valve in the gas pipe closed whenever any kind of work is being performed to the burner and switchboard
Burner dimensions
Fig. 17:
Burner
type Type of gas Gas ramp system Dim. L1 approx. Dim. L2 approx. Dim. L3 approx. Dim. L4 Dim. L5 approx. Dim. D1 ø Dim. D2 ø Dim.
H1 Dim. H2 Dim. H3 Dim. B
GZ 2.1 Natural gas Rp 1“ 150 230 240 80 570 115 115 240 355 295 305 GZ 2.1 Liquefied gas Rp 1“ 150 230 240 80 570 115 115 240 355 295 305 GZ 2.2 Natural gas Rp 1¼“ 180 230 240 80 600 115 130 240 355 295 305 GZ 2.2 Liquefied gas Rp 1“ 180 230 240 80 600 115 130 240 355 295 305 GZ 3.0 Natural gas Rp 1¼“ 200 350 260 130 830 140 140 350 490 380 375 GZ 3.1 Natural gas Rp 1½“ 265 350 525 130 850 140 175 320 490 380 386 GZ 3.1 Natural gas Rp 2“ 265 350 570 130 850 140 175 320 490 380 386 GZ 3.2 Natural gas Rp 2“ 270 350 570 130 850 152 200 320 490 380 386 GZ 3.3 Natural gas Rp 2“ 270 470 570 130 970 152 200 320 490 380 386 GZ 3.3 Natural gas DN 65 270 470 1580 180 970 152 200 370 490 380 386 GZ 4.1 Natural gas Rp 2“ 430 590 1230 210 1380 186 230 285 650 515 470 GZ 4.1 Natural gas DN 65 430 590 1650 210 1380 186 230 285 650 515 470 GZ 4.1 Natural gas DN 80 430 590 2150 210 1380 186 230 285 650 515 470 GZ 4.2 Natural gas DN 65 430 590 1650 210 1380 186 280 285 650 515 470 GZ 4.2 Natural gas DN 80 430 590 2150 210 1380 186 280 285 650 515 470 GZ 2.1 - GZ 3.3 GZ 4.1 - GZ 4.2
Connections
Burnertype Motor voltage output Motor Connected wattage
GZ 2 230 V WS 50 Hz 0,25 kW 0,37 kW, ca. 2 A GZ 3.0 230 V WS 50 Hz 0,45 kW 0,7 kW, ca. 3,2 A GZ 3.1 400 V DS 50 Hz 1,1 kW 1,4 kW, ca. 3 A GZ 3.2 400 V DS 50 Hz 1,1 kW 1,4 kW, ca. 3 A GZ 3.3 400 V DS 50 Hz 1,1 kW 1,4 kW, ca. 3 A GZ 4 400 V DS 50 Hz 3,0 kW 3,3 kW, ca. 6 A
Boiler connections
Electric supply diagram
Assembly with silencer hood for GZ 3
and GZ 4
When a silencer hood is fitted, the pipe double nipple may have to be lengthened to a size of 200 mm.
The pipe length between gas ramps and burner should be as short possible. For gas burners GZ 3 and GZ 4, the max. pipe length is 800 mm. A bracket is required to take the weight of the gas ramps.
The dimension H must be checked before erecting boilers with-out boiler foundations.
Fig. 18: Assembly with silencer hood for GZ 3 and GZ 4
Type D1 D2 M GZ 2.1 130 160 ÷ 180 8/10 GZ 2.2 140 160 ÷ 180 8/10 GZ 3.0/1 150 180 ÷ 205 10 GZ 3.2/3 162 220 ÷ 240 10 GZ 4 195 246 ÷ 276 12
Circuit diagramm GZ 2
Fig. 19:
Item b2 b3 b4 b5 b6 b8 IS k1 m1 m2 m3 s1 s2 u1 u2
Indic
ation
On-off-Switch Safety thermostat On-off-thermostat On-off-thermostat Gas pressure switc
h
Air pressure switc
h
Ioniz
ation
Condenser Motor with c
ondenser
Ignition transformer Servomotor Solenoid valve , two-stage (stage 1 and 2) Safety solenoid valve Gas burner automatic safety
l
Leakage tester Observ
e loc
al and VDE-regulations.
Connec
tions to earth potential being
executed carefully.
Also when using the leak check
Caution: do not c
onfuse phase and Mp.
Multibloc
Working hours 2
Working hours 1 Failure
Circuit diagramm GZ 3.0
Item b2 b3 b4 b5 b6 b8 IS k1 m1 m2 m3 s1 s2 u1 u2
Indic
ation
On-off-Switch Safety thermostat On-off-thermostat On-off-thermostat Gas pressure switc
h
Air pressure switc
h
Infra-red flicker detector Condenser Motor with c
ondenser
Ignition transformer Servomotor Solenoid valve , two-stage (stage 1 and 2) Safety solenoid valve Gas burner automatic safety control Leakage tester Observ
e loc
al and VDE-regulations.
Connec
tions to earth potential being
executed carefully.
Fig. 20:
Also when using the leak check Caution: do not confuse phase and Mp.
Multibloc
W
orking hours 2
W
Circuit diagramm GZ 3.1 - GZ 3.3
Fig. 21:
1) Connec
tor as per DIN 4791
LK = luster terminal in the base of the automatic gas fir- ing dev
ic
e
Gas ramp block or line with se
pa ra te pa rts (w ith-out connector) Working hours 2 Working hours 1 Failure Item b2 b3 b4 b5 b6 b8 c1 e2 IS m1 m2 m3 s1 s2 u1 u2 Indication On-off-S w itch Saf et y t her most at On-off-the rmosta t On-off-the rmosta t
Gas pressure switch Air pressure switch Motor conta
ctor Bimet allic r elais In fra -re d fl ic ke r de te ctor
Motor with condenser Igni
tion tra nsforme r Se rvomotor Solenoid valve , t w o-st age (sta ge 1 and 2) Saf et y solenoid valve Ga s burne r a utoma tic sa fe ty control Leakage t est er
Observe local and VDE-regulations. Connections to earth potential be- ing execut
ed car
ef
Circuit diagramm GZ 4
Fig. 22: Obser ve local and V DE-regulations. * Parts to be supplied on site Principle cir
cuit
Connector as per DIN
Engine valve
Working hours 2 Working hours 1 Failure
When using the leak check
Item b2* b3* b4* b5* b6 b8 c1 e1* e2 IS m1 m2 m3 s1 s2 u1 u2 Indication On-off-S w itch Saf et y t her most at On-off-the rmosta t 1 On-off-the rmosta t 2
Gas pressure switch Air pressure switch Motor conta
ctor
Motorsicherung Bimet
allic r
elais
Ionisation electrode Motor Igni
tion tra
nsforme
r
Se
rvomotor
Solenoid valve Engine valve Ga
s burne r a utoma tic sa fe ty Leakage t est er
Sensor selection switch to
"ION
Maintenance and service
Many European laws require that combustion heating systems have to be checked once a year by a qualified heating engineer. The burner should be thoroughly checked and cleaned (tan im-peller, mixing system, ignition system). The gas filter should be re-placed as required and the assembly of the air damper axle oiled in GZ 4 (see Fig. 25).
For maintenance, the burner is removed from its housing by turning the four quick release screws and disconnecting the gas compact ramps or the gas ramps system, then hanging it in one of the service positions (GZ 2 - GZ 3).
In GZ 4, the nozzle system can be removed separately after dis-connecting the ignition cable plug and the ionisation cable and after unscrewing the flange cover screws.
Before removing the nozzle system, care must be taken to en-sure that the servomotor has returned to the closed position.
Fig. 23: Burner in service Position
Fig. 24: Heating room dimensions for GZ 4
Guarantee
MHG gas burners should work perfectly after beings installed and started by a qualified heating engineer, and when used for combustion of the gas types stipulated in DVGW paper G 250 certified for the particular gas burners.
The guarantee period lasts for 24 months after first start-up and not more than 27 months after the date of dispatch. Please consult the burner documents for details.
For details please consult the burner card.
Spare parts
When replacing parts, only use original spare parts from MHG. Some components are specially designed and manu-factured for MHG burners.
When ordering spare parts, please always state the burner number.
All dimensions in mm.
Technical details and components subject to change without prior notice.
Manufacturer's certificate
as per § 7 (2) 1. BImSchV (First ordinance for implementation
of the German Emission Protection Law) Hamburg, 14.10.2005
MHG Heiztechnik GmbH herewith certifies for the gas burners stated below
Product Gas burner
Trade name Forced draught burner
Type / design no GZ 2.1 - 2.2 / CE-0085AQ0916
GZ 3.0 - 3.3 / CE-0085AQ0916
GZ 4.1 - 4.2 / CE-0085AQ0916
Test standards DIN EN 676
Testing agency Gaswärme Institut (GWI) Essen
Quality management system DIN EN ISO 9001
Certified by Germanischer Lloyd (GLC)
that these products fulfil the requirements of the stated directives and standards, and correspond to the design tested by the above stated testing agency. However, this declaration does not constitute a warranty of any qualities
In addition, this burner remains below the tolerable value of max. 120 mg/kWh for nitrogen oxide.
stipulated in the ordinance text of §7 (2) 1. BImSchV (First ordinance for implementation of the German Emission Protection Law).
The oil burners designed above are intended only for the installation in boilers which have also been certified to the corre-sponding directives and standards.
The contractor assembling the system shall guarantee that all regulations relating to the interaction of oil burner and boiler have been observed.
MHG Heiztechnik GmbH
EC Declaration of Conformity
Hamburg, 14.10.2005 MHG Heiztechnik GmbH herewith certifies that the forced draught gas burners stated below:Product Gas burner
Trade name Forced draught burner
Type GZ 2, GZ 3, GZ 4
correspond to the type/design described in the EU type/design test certificate
They comply with the valid requirements of gas appliance directive 90/396 EEC dated 29.06.1990. MHG Heiztechnik GmbH Niedermayer i. V. Gieseler
