Heat Pump Module

Unit Protection Module

(UPM)

Every unit has an integral heat pump module that contains hermetic scroll-type compressor(s), a coaxial refrigerant-to-water heat exchanger(s), refrigerant flow reversing valve(s), expansion valve(s), liquid line filter drier, high pressure manual reset cutout, crankcase heater(s) and various sensors, service ports and safety devices which allows the unit to run at less than full capacity and results in fewer compressor cycles. The heat pump is intended to be connected to an external water source such as a water cooling tower or boiler, a geothermal source or even a ground loop. The module is piped to the airside coil located in the intake airstream and optionally to a reheat coil that will control humidity.

The location of components in the module will vary.

Control circuitry and the Unit Protection Module (UPM) for the heat pump module are located in the heat pump module. The UPM is a

printed circuit board and has LED fault indicator lights to indicate various alarm conditions and also power status. A unit- specific schematic for electrical circuits is located in the control center and another unit-specific schematic for heat pump

circuitry is located in the heat pump module.

Optional Electric Heaters

There are two optional electric heaters available. One is a preheater and is used to prevent frost buildup on the energy wheel. It is located directly in front of the intake air filter assembly. The second optional heater is used as a supplementary emergency heat source for the building and is integrated into the supply airstream.

	Optional Electric	Optional Electric
	Preheater Location
		Heater Location

Supply Air Motor and

Blower Assembly

Optional Indirect Gas Furnace

An optional indirect gas furnace may be installed and provides supplementary emergency heat to the building. A complete Installation, Operation and Maintenance Manual for the furnace is provided with the unit. A unit- specific wiring diagram is located inside the furnace housing access door.

High Efficiency

Scroll Type

Compressors

Coaxial

Refrigerant-

to-Water Heat

Exchangers

Heat Pump Module

Refrigerant

Reversing

Valves

Indirect Gas Furnace

Water Intake

and Discharge

Connections

6Model ERCH-HP Energy Recovery Unit

473501 specifications

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