PACKAGED DIMENSIONS AND WEIGHTS Unit
8.9. OPTIONAL POST HEATER COILS HR85/95
The unit can optionally be fitted with an electrical post-heater manufactured with open coil heating elements and galvanized casing.
The heater is complete with fully modulating SCR (Silicon Controlled Rectifier) control (0-100%) and 2 stages of overheat protection (automatic and manual reset) all integral to the unit’s control strategy. The thermostat terminals are linked out if the electric heater is not present.
The SCR control provides accurate, supply air temperature modulation.
The heat output is precisely controlled from 0 to 100% to a user defined setpoint by using the unit in-built temperature sensors or a room temperature sensor (supplied with every unit for installation and wiring by others on site).
The unit can optionally be supplied with an integral water heater operating with LPHW to provide supply air top up heating.
The coils are manufactured with aluminium fins, copper tubes and assembled on a corrosion resistant galvanized casing.
The maximum operating pressure is 16bar at 110°C.
The heating output is automatically modulated by the in-built temperature sensors and the integral unit controls.
Valves and actuators are not included and must be ordered separately
Where cooling is also required an optional changeover water coil can be provided operating with either chilled and/or hot water (depending on the seasonal requirements) on a common water circuit.
Alternatively a direct expansion (DX) coil operating with R410A refrigerant can be offered.
All DX coils are tested to 46bar.
Both DX and WCO coils are manufactured with aluminium fins with hydrophilic coating, copper tubes and assembled on a corrosion resistant galvanized casing. The cooling coil section is also equipped with a plastic droplet eliminator.
A fully removable, epoxy coated, galvanized condensate tray fitted with a 30mm OD drain connection is provided for condensate collection and disposal.THERM-X MVHRU IOM Page 64 of 109 Version 2.3, 18/09/2020
The condensate tray is equipped with a water level sensor to avoid overflow of the tray by stopping operation.HRFL2
The unit can optionally be fitted with an electrical post-heater manufactured with open coil heating elements and galvanized casing.
The heater is complete with fully modulating SCR (Silicon Controlled Rectifier) control (0-100%) and 2 stages of overheat protection (automatic and manual reset) all integral to the unit’s control strategy.
The SCR control provides accurate, supply air temperature modulation.
The heat output is precisely controlled from 0 to 100% to a user defined setpoint by using the unit in-built temperature sensors or a room temperature sensor (supplied with every unit for installation and wiring by others on site).
The unit can optionally be supplied with an integral water heater operating with LPHW to provide supply air top up heating.
The coils are manufactured with aluminium fins, copper tubes and assembled on a corrosion resistant galvanized casing.
The maximum operating pressure is 16bar at 110°C.
The heating output is automatically modulated by the in-built temperature sensors and the integral unit controls.
Valves and actuators are not included and must be ordered separately
Where cooling is required an optional water changeover (WCO) coil can be provided operating with either chilled and/or hot water (depending on the seasonal requirements) on a common water circuit.
Alternatively a direct expansion (DX) coil operating with R410A refrigerant can be offered.
All refrigerant coils are tested to 46bar.
Both DX and WCO coils are manufactured with aluminium fins with hydrophilic coating, copper tubes and assembled on a corrosion resistant galvanized casing.
The cooling coil section is also equipped with a plastic droplet eliminator to avoid moisture carryover.
A fully removable, epoxy coated, galvanized condensate tray fitted with a 22mm OD drain connection is provided for condensate collection and disposal.
The condensate tray is equipped with a water level sensor to avoid overflow of the tray by stopping operation.
These coils are provided on an externally mounted module with equivalent construction to the heat recovery unit (supplied loose for installation and wiring by others on site).
After installed the module requires wiring of the integral temperature sensors to the unit control panel (by others on site).
The external module cooling/heating output is modulated by the unit controller.THERM-X MVHRU IOM Page 65 of 109 Version 2.3, 18/09/2020 8.10. PIPEWORK CONNECTIONS
To avoid strain on pipe joints from movement or vibrations, pipework should be connected to the unit as soon as possible.
Inlet and outlet connections shall be connected using suitable flexible hoses of the same size as the installation pipework.
Installation pipework should be supported independently from the unit.
All pipework and connections must be insulated to prevent thermal losses and condensation dripping from chilled surfaces.
Insulation must not cover over air vents, drain cocks or ports on commissioning sets. Commissioning sets must be placed so ports are easily accessible for measuring purposes.
Provision should be made, e.g. binder test points, for measuring pressure at flow and return connections, or at common test points where a number of identical units are connected to self-balancing pipework. Access must be provided to all test points and across orifice/venture measuring devices.
Flow measuring devices, e.g. commissioning set with orifice plate and double regulating valve, should be selected to give a measured pressure of no less than 1 kPa. It may be necessary to use a device less than line size for a unit. There should be a minimum of ten diameters of straight pipe length upstream and five diameters downstream of the measuring device.IMPORTANT: On units equipped with changeover water heat exchangers a 3-way diverting valve piping arrangement is recommended.
If a 2-way valve must be used the length of the pipework must be assessed in advance to avoid issues with the operation of the equipment.
IMPORTANT: Valves and actuators are not included with the product and must be ordered separately.
THERM-X MVHRU IOM Page 66 of 109 Version 2.3, 18/09/2020 8.11. CONDENSATE REMOVAL
As long as there are conditions favourable for the creation of condensate ensure the unit condensate outlet (s) is connected to an appropriate water waste system.
Ensure the equipment is angled slightly (recommended 3º) towards the condensate tray outlet spout to facilitate condensate removal from the unit.
Copper or plastic pipework can be used for the condensate disposal system which should run at a gradient of about 1:50 (20 mm.m-1).
If the pipework connecting the outlet from the unit to the condensate drainage system is installed on a location that is likely to freeze the pipe must be insulated or equipped with a frost pipe heater.
A condensate removal system is not included with the HRFL II units. If supplied by Barkell the pump or trap is supplied loose for installation on site by others.
HR95 units have an integral insulated condensate trap with integral freeze protection for the PHE. This must be connected to an appropriate wastewater system.
A condensate level sensor is fitted in every condensate drain tray and connected to the unit control panel in order to stop the equipment in case of overflow.Condensate traps
Before putting the unit into operation, fill in the trap with water, otherwise there is a risk of flooding and damage to the unit.
The use of a condensate trap is only recommended where gravity assisted drainage is achievable.
Ensure the condensate trap is installed with sufficient height difference from the unit so that the condensate can drain freely by gravity.
One trap is required per condensate outlet. Two condensate outlet connections should not be joined together into the same trap.Condensate pumps
If condensate pumps are fitted these should be properly mounted so pipes and hoses will not kink or become detached in operation. Pipe clamps should always be used.
Ensure that the condensate discharge point height does not exceed the maximum head of 12m for the condensate pump.
Avoid fixing the pump body to the unit as it might cause vibration and slip from the surface over time.
The pump body should be fitted in a horizontal, non-slippery surface and mounted on top of an antivibration pad.
One pump is required per condensate outlet. Two condensate outlet connections should not be joined together into the same pump.
For additional information on the pump installation, operation and maintenance please refer to the document Therm-X MVHRU Condensate Pump Installation and the IOM manual provided with the pump.THERM-X MVHRU IOM Page 67 of 109 Version 2.3, 18/09/2020 8.12. MODULAR UNITS (HR85-300 AND LARGER)
HR85 units up to size 200 are supplied in a single piece.
Larger units (300 and above) are supplied in a modular arrangement with each section individually packed and provided with quick-fit electrical and mechanical connections (assembly and wiring on site by others).
Please refer to the document Therm-X MVHRU HR85 Modular Assembly for additional information on the assembly of these modules.
In document
MECHANICAL VENTILATION AND HEAT RECOVERY UNITS
(Page 63-67)