Heat Controller HTD Electrical Thermostat Wiring, Thermostat Installation, ATM21U01, Fault LED

Installation, Operation & Maintenance HTV/HTD/HTH SERIES Heat Controller, Inc.

Electrical - Thermostat Wiring

ѥCAUTION! ѥ

CAUTION! Many units are installed with a factory or ¿eld supplied manual or electric shut-off valve. DAMAGE WILL OCCUR if shut-off valve is closed during unit

Figure 24: Units With Optional ECM Fan.

Connection to ECM Control

ATP32U04	Thermostat	ECM
		Board

operation. A high pressure switch must be installed on the heat pump side of any ¿eld provided shut-off valves and connected to the heat pump controls in series with the built-in refrigerant circuit high pressure switch to disable compressor operation if water pressure exceeds pressure switch setting. The ¿eld installed high pressure switch shall have a cut-out pressure of 300 psig and a cut-in pressure of 250 psig. This pressure switch can be ordered from ClimateMasterManufacturer with a 1/4” internal Àare connection as part number 39B0005N02.

ѥCAUTION! ѥ

Compressor Compressor Stage 2 Auxiliary Heat Dehumidification Reversing Valve Fan 24Vac Hot

24Vac Common Fault LED

Y1

Y2

W

DH

O

G

R

C

L

Y1

Y2

W

DH

O

G

R

C

AL1

CAUTION! Refrigerant pressure activated water regulating valves should never be used with ClimateMasterManufacturer equipment.

Thermostat Installation

The thermostat should be located on an interior wall in a larger room, away from supply duct drafts. DO NOT locate the thermostat in areas subject to sunlight, drafts or on external walls. The wire access hole behind the thermostat may in certain cases need to be sealed to prevent erroneous temperature measurement. Position the thermostat back plate against the wall so that it appears level and so the thermostat wires protrude through the middle of the back plate. Mark the position of the back plate mounting holes and drill holes with a 3/16” (5mm) bit. Install supplied anchors and secure plate to the wall. Thermostat wire must be 18 AWG wire. Wire the appropriate thermostat as shown in Figures 24 and 25 to the low voltage terminal strip on the CXM (units with PSC motor) or ECM control board (units with ECM motor). Practically any heat pump thermostat will work with these units, provided it has the correct number of heating and cooling stages.

NOTICE: Units with ClimaDry whole house dehumidiÄcation option require a separate humidistat or thermostat part number ATP32U04 (See ClimaDry AOM for more details).

UnitsUnitswithwithCXMCXMororDXMDXMboardboardandandECMECMfanfanmotor,motor,utilizingutilizingECMECMdehumididehum dificationfication mode

mode (without ClimaDry option) Notes:

1)Notes:ECM dehumidification mode slows down fan speed in the cooling mode when 1) Units with whole house dehumidification option have slightly different

dehumidification output from thermostat is active. Normal heating and cooling fan thermostat wiring.Terminal DH at the thermostat is connected to terminal H at speeds are not affected.

the DXM board

2)2)ECMECMboarddehumidificationDIP switch SW9modemustslowsbedownin dehumidfan speed. modein fortheECMcoolingdehumidimode fiwhencation mode.

dehumidification output from thermostat is active. Normal heating and cooling fan speeds are not affected.

3)ECM board DIP switch SW9 must be in dehumid. mode for ECM dehumidification mode.

Figure 25: Typical Thermostat 2 Heat/1 Cool (PSC Fan)

Connection to CXM Control

ATM21U01	Thermostat		CXM
Compressor		Y	Y
Heating Stage 2		Y2/W	W
Reversing Valve		O	O
	Fan	G	G
24Vac Hot		R	R
24Vac Common		C	C
Fault LED		L	AL1

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