Service manual

25
climatemaster.com
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Tranquility
®
Compact (TC) Series
Rev.: 02/06/15
Electrical - Power & Low Voltage Wiring
Special Note for AHRI Testing: To achieve rated
airfl ow for AHRI testing purposes on all PSC products,
it is necessary to change the fan speed to “HI” speed.
When the heat pump has experienced less than 100
operational hours and the coil has not had suffi cient time
to be “seasoned”, it is necessary to clean the coil with a
mild surfactant such as Calgon to remove the oils left by
manufacturing processes and enable the condensate to
properly “sheet” off of the coil.
ELECTRICAL - LOW VOLTAGE WIRING
Connect the blue wire to:
H for High speed fan
M for Medium speed fan
L for Low speed fan
Medium is factory setting
Fan Motor
Figure 16: PSC Motor Speed Selection
Figure 17: Low Voltage Field Wiring
Low Water Temperature Cutout Selection - The CXM/
DXM control allows the fi eld selection of low water (or
water-antifreeze solution) temperature limit by clipping
jumper JW3, which changes the sensing temperature
associated with thermistor LT1. Note that the LT1
thermistor is located on the refrigerant line between
the coaxial heat exchanger and expansion device (TXV).
Therefore, LT1 is sensing refrigerant temperature, not
water temperature, which is a better indication of how
water fl ow rate/temperature is affecting the refrigeration
circuit.
The factory setting for LT1 is for systems using water
(30°F [-1.1°C] refrigerant temperature). In low water
temperature (extended range) applications with
antifreeze (most ground loops), jumper JW3 should be
clipped as shown in Figure 18 to change the setting to
10°F [-12.2°C] refrigerant temperature, a more suitable
temperature when using an antifreeze solution. All
ClimateMaster units operating with entering water
temperatures below 60°F [15.6°C] must include the
optional water/refrigerant circuit insulation package to
prevent internal condensation.
Thermostat Connections - The thermostat should be
wired directly to the CXM or DXM board (units with PSC
fan). Units with optional ECM motor include factory
wiring from the CXM or DXM board to the ECM interface
board. Thermostat wiring for these units should be
connected to the ECM interface board. Figure 17 shows
wiring for units with PSC or ECM motor. See “Electrical
– Thermostat” for specifi c terminal connections. Review
the appropriate AOM (Application, Operation and
Maintenance) manual for units with DDC controls.
CONTROL LAYOUT
CAP
ECM
TRANS
GND
LL2
T2 T1
CC
Low voltage
thermostat
wiring units
with PSC Fan
Low voltage
thermostat
wiring units
with ECM Fan