Heat Controller HSS manual Electrical HWG Wiring, HWG Wiring Indoor Compressor Section

T h e Q u a l i t y L e a d e r i n C o n d i t i o n i n g A i r

R e s i d e n t i a l S p l i t - 6 0 H z R 2 2 & R 4 1 0 A

R e v. : 5 J u n e , 2 0 0 8

Electrical - HWG Wiring

HWG Wiring - “Indoor” Compressor Section

The hot water generator pump power wiring is disabled at the factory to prevent operating the HWG pump “dry.” After all HWG piping is completed and air purged from the water piping, the pump power wires should be applied to terminals on the HWG power block PB2 as shown in the unit wiring diagram. This connection can also serve as a HWG disable when servicing the unit.

ELECTRICAL - LOW VOLTAGE WIRING

Thermostat Connections

The thermostat should be wired directly to the CXM board. Figures 22a through 22c show low voltage wiring. Note that the air handler or furnace transformer will be used to power the CXM board in the compressor section. See “Electrical – Thermostat” for specific terminal connections.

Figure 22a: HTS Low Voltage Field Wiring

Low voltage field wiring

Figure 22b: HSS Low Voltage Field Wiring

		C apacitor
		Circ Brkr
G rnd	Loop PB1	HW G PB2

Contactor-CC

Low Water Temperature Cutout Selection

The CXM control allows the field selection of low water (or water-antifreeze solution) temperature limit by clipping jumper JW3, which changes the sensing temperature associated with thermistor FP1. Note that the FP1 thermistor is located on the refrigerant line between the coaxial heat exchanger and expansion device (TXV). Therefore, FP1 is sensing refrigerant temperature, not water temperature, which is a better indication of how water flow rate/temperature is affecting the refrigeration circuit.

The factory setting for FP1 is for systems using water (30°F [-1.1°C] refrigerant temperature). In low water temperature (extended range) applications with antifreeze (most ground loops), jumper JW3 should be clipped as shown in Figure 23 to change the setting to 10°F [-12.2°C] refrigerant temperature, a more suitable temperature when using

an antifreeze solution. All residential units include water/ refrigerant circuit insulation to prevent internal condensation, which is required when operating with entering water temperatures below 59°F [15°C].

L2

L1

BR

C XM Control

Low Voltage Connector

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