THERM-X MVHRU IOM
Page 64 of 108
Version 2.2, 18/06/2020
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 protec
tion (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.
