R e s i d e n t i a l Tr a n q u i l i t y
®
2 7 S p l i t ( T T S ) - 6 0 H z H F C - 4 1 0 A
R e v. : 8 M a y, 2 0 1 4 C
c l i m a t e m a s t e r. c o m
27
Electrical - Low Voltage Wiring
Low voltage
fi
eld wiring
Thermostat Connections (Indoor Compresor Section)
The thermostat should be wired directly to the CXM board.
Figure 21 show low voltage wiring. Note that the air handler
or furnace transformer will be used to power the CXM board
in the compressor section. See “Electrical – Thermostat” for
specifi c terminal connections.
Low Air Temperature Sensor Installation
After mounting the FP2 sensor in the air handler connect the
sensor wiring to the violet wires in the compressor section’s
control box as shown in Figure 22.
Clip the violet wire
loop in the compressor section’s control box.
Wire the
violet leads from FP2 to the violet leads clipped in the control
box. FP2 sensor is packed inside the compressor section
control box.
Low Water Temperature Cutout Selection
The CXM 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
23 to change the setting to 10°F [-12.2°C] refrigerant
temperature, a more suitable temperature when using
an antifreeze solution. All residential units include water/
refrigerant circuit insulation to prevent internal condensation,
which is required when operating with entering water
temperatures below 59°F [15°C].
Figure 21: TTS Low Voltage Field Wiring
