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Installation, Operation & Maintenance
Electrical - Thermostat Wiring
CAUTION!
CAUTION! Many units are installed with a factory or fi eld
supplied manual or electric shut-off valve. DAMAGE WILL
OCCUR if shut-off valve is closed during unit operation. A
high pressure switch must be installed on the heat pump side
of any fi 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 fi 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 the manufacturer with a 1/4" internal fl are
connection as part number 39B0005N02.
CAUTION!
CAUTION! Refrigerant pressure activated water regulating
valves should never be used with the manufacturer's 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 6 and 7 to the low voltage terminal strip on
the ECM control board. Practically any heat pump thermostat
will work with these units, provided it has the correct number of
heating and cooling stages.
4-Wire Connection ATC communicating thermostat and DXM2
Communicating control in HTS Splits
AXM control in WDG Air Handler allows 4-wire connection with
Communicating DXM2 board and Communicating Thermostat.
AIR HANDLER SERIES
Figure 6: Connection to Non-Communicating
thermostat and AXM communicating control
in WDG Air Handler
Non-Communicating
2 Cool / 3 Heat Thermostat
Compressor
Compressor Stage 2
Reversing Valve
24Vac Hot
24Vac Common
Dehumidification
Dehumidifi cation
(ATP32U04 Only)
Fault LED
Thermostat Connections
C
24V Common for Control Circuit
R
24V Supply for Control Circuit
A+
Communications (Positive)
B –
Communications (Negative)
Figure 7: 4-Wire Connection to ATC communicating
thermostat, AXM Communicating control
and HTS Splits
Thermostat
C
R
Thermostat Connections
C
R
A+
B –
14
Communicating
TAH AXM Control
Y1
Y1
Y2
Y2
O
O
R
R
G
G
Fan
C
C
DH
DH
AL1
L
Communicating
WDG with
AXM Control
C
A+
A+
B-
B-
24V
R
24V Common for Control Circuit
24V Supply for Control Circuit
Communications (Positive)
Communications (Negative)
Heat Controller, Inc.
DXM2 In
Compressor
Section
C
C
A+
A+
B-
B-
24V
24V
DXM2 in
Compressor
Section
C
C
A+
A+
B-
B-
24V
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