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climatemaster.com
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Tranquility
®
30 (TT) Series
Rev.: 07/18/13
Electrical - Power & Low Voltage Wiring
ELECTRICAL - LOW VOLTAGE WIRING
Figure 16: Low Voltage Field Wiring
Low voltage fi eld wiring for units with ECM fan
Thermostat Connections - Depending on the unit model
the thermostat will be wired to either the ECM control
board or a terminal block, both are located within the
unit control box. Refer to the unit wiring diagram for
specifi c details.
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 17 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.
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