Service manual

25
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Consoles
Rev.: 5 Nov., 2009B
climatemaster.com
Thermostat Installation
The thermostat should be located on an interior wall
in a larger room, away from supply air 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 Figure 7 to
the low voltage terminal strip on the CXM or DXM control
board. Practically any heat pump thermostat will work
with ClimateMaster units, provided it has the correct
number of heating and cooling stages.
WIRE SIZE MAX. WIRE LENGTH*
18-Gauge 75 feet [22m]
16-Gauge 125 feet [38m]
14-Gauge 200 feet [60m]
*Length = Physical distance from thermostat to unit.
Table 6: Recommended Thermostat Wire Sizes
Figure 7: Typical Thermostat Wiring
Thermostat
Connection to CXM Control
Compressor
Reversing Valve
Fan
24Vac Hot
24Vac Common
Fault LED
Y
O
G
R
C
L
Y
O
G
R
C
AL1
CXM
Electrical - Low Voltage
Optional Wall-Mounted Thermostat
CCE & TRC WSHP units are built with standard internal
thermostats in either manual changeover (MCO) or
automatic changeover (ACO) confi guration. No external,
fi eld-installed low-voltage wiring is required.
When desired, the unit can be furnished with a 24-volt
control circuit which is fi eld-wired to a ClimateMaster-
supplied accessory remote thermostat.
Zone integrity must be maintained to effi ciently control
units or groups of units. Unless zones of control are
considered and accounted for, adjacent units may
operate in heating and cooling modes simultaneously.
Low-voltage wiring between the unit and the wall
thermostat must comply with all applicable electrical
codes (i.e., NEC and local codes), and be completed
before the unit is installed.