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The Quality Leader in Conditioning Air
Residential Split - 60Hz R22 &R410A
Rev.: 5 June, 2008
www.heatcontoller.com
Electrical - Low Voltage Wiring
Figure 27: Two-Stage HTS Piping
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. 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 28a and 28b to the low voltage terminal strip on the
CXM control board. Practically any heat pump thermostat will
work with these units, provided it has the correct number of
heating and cooling stages.
Figure 28b: Typical Thermostat Wiring, HSS Single-Stage
Units (2 Heat/1 Cool)
Figure 28a: Typical Thermostat Wiring, Two-Stage HTS
Units (3 Heat/2 Cool)
x CAUTION! x
CAUTION! Many units installed with a factory or field 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 field
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 field installed
high pressure switch shall have a cut-out pressure of 235 psig
and a cut-in pressure of 190 psig. This pressure switch can
be ordered from HCI with a 1/4” internal flare connection as
part number 39B0005N01.
x CAUTION! x
CAUTION! Refrigerant pressure activated water regulating
valves should never be used with HCI equipment.