Installation, Operation & Maintenance | HEV/H SERIES | Heat Controller, Inc. |
|
|
|
ELECTRICAL - THERMOSTAT WIRING
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
Figure 23b: Conventional 3 Heat / 2 Cool Thermostat
Connection to DXM2 Control
Thermostat | DXM2 |
| Board |
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 24a and 24b to the low voltage terminal strip on the DXM2 control board. Practically any heat pump thermostat will work with these units, provided it has the correct number of heating and cooling stages. However, using the communicating thermostat (ATC32) is highly
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
H
O
G
R
C
AL1
recommended for
CAUTION!
CAUTION! Refrigerant pressure activated water regulating valves should never be used with manufacturer’s equipment.
Figure 23a: Communicating Thermostat Connection to DXM2 Control
Notes:
1)ECM automatic dehumidification mode operates with dehumidification airflows in the cooling mode when the dehumidification output from thermostat is active. Normal heating and cooling airflows are not affected.
2)DXM2 board DIP switch
3)DH connection not possible with units with internal pump. Use ATC32U**.
4)Only use ATC Communicating Thermostat when using Humidifier (H Input) with units with internal flow controller.
Figure 24: Typical Thermostat 2 Heat/1 Cool
Connection to DXM2 Control
Thermostat | DXM2 |
Thermostat ATC32U**
DXM2
Gnd
Compressor | Y |
|
|
| Y1 |
|
|
| |||
|
|
|
|
|
|
Heating Stage 2 | Y2/W |
|
|
| W |
|
|
|
24Vac Common
24Vac Hot
C
R
Comm + A+
Comm - B-
OD
GND
ID
A+
B-
24V
Outdoor
Sensor
(Optiona)
Remote Indoor
Sensor
(Optiona)
Reversing Valve | O |
|
|
| O |
|
|
| |||
Fan | G |
|
|
| G |
|
|
| |||
24Vac Hot | R |
|
|
| R |
|
|
| |||
24Vac Common | C |
|
|
| C |
|
|
| |||
Fault LED | L |
|
|
| AL1 |
|
|
|
(Using 2 Heat / 1 Cool thermostat is not recommended if maximum efficiency is desired)
26
