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
25
c l i m a t e m a s t e r. c o m
Tr a n q u i l i t y 1 6 ( T C ) S e r i e s
R e v. : 2 5 J u l y, 2 0 1 7
Electrical - Power & 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 17: PSC Motor Speed Selection
Figure 19: Low Voltage Field 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
Thermostat Connections
The thermostat should be wired directly to the
CXM or DXM board. Figure 19 shows low voltage
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 or cap tube). 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
-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 20 to change the setting to -12.2°C refrigerant
temperature, a more suitable temperature when using
an antifreeze solution. All ClimateMaster units operating
with entering water temperatures below 15°C must
include the optional water/refrigerant circuit insulation
package to prevent internal condensation.
