23
c l i m a t e m a s t e r. c o m
T H E S M A R T S O L U T I O N F O R E N E R G Y E F F I C I E N C Y
Tranquility
®
Compact (TC) Series
R e v. : 0 2 / 0 4 / 1 3
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
Thermostat Connections
- The thermostat should be
wired directly to the CXM or DXM board. Figure 19
shows wiring. See “Electrical – Thermostat” for specifi c
terminal connections. Review the appropriate AOM
(Application, Operation and Maintenance) manual for
units with DDC controls.
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 FP1. Note that the FP1
thermistor is located on the refrigerant line between
the coaxial heat exchanger and expansion device (TXV).
Therefore, FP1 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 FP1 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.
