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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 plate against
the wall so that it appears level and so the
thermostat wires protrude through the
middle of the back plate
ELECTRICAL - THERMOSTAT WIRING
HTV/HTD/HTH SERIES
Figure 15: Unit with ECM Fan
(A Two-Stage Thermostat is Required)
Connection to ECM Control
Thermostat
Compressor Y1
Heating Stage Y2
Reversing Valve 0
Fan G
24 VAC Hot R
24 VAC Common C
Fault LED L
Mark the position of the back plate mounting
holes and drill holes with a 3/16" bit. Install
supplied anchors and secure plate to the
wall. Thermostat wire must be 18 AWG
wire. Wire the appropriate thermostat as
shown in Figure 15 to the low voltage
terminal strip on the ECM control board.
Practically any heat pump thermostat will
work with Heat Controller units, provided it
has the correct number of heating and
cooling stages.
ECM Interface Board
Y1
Y2
0
G
R
C
L
25
28
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