ClimateMaster Tranquility TCH 024 - Electrical - Power & Low Voltage Wiring

climatemaster.com
35
Tranquility
®
Compact (TC) Series
Rev.: July 7, 2020
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Electrical – Power & Low Voltage Wiring
ELECTRICAL - LOW VOLTAGE WIRING
Thermostat Connections - The thermostat should be
wired directly to the CXM or DXM2 board. See “Electrical
– Thermostat” for specic terminal connections. Review
the appropriate AOM (Application, Operation and
Maintenance) manual for units with DDC controls.
Low Water Temperature Cutout Selection - The CXM/
DXM2 control allows the 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 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 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.
Models with Waterside Economizer - Assemble
controller to DIN rail connect molex connector. Factory
settings are 45°F (7.2°C), valve opens, closes at 55°F
(12.8°C), and 5 minute short cycle delay. Settings are
adjustable.
Figure 17: LT1 Limit Setting
CXM PCB
LT1
LT2
LT 1
LT 1
LT 2
LT 2
JW3-LT1 jumper
should be clipped
for low tempera-
ture operation