CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Tranquility
®
(TRL) Series
R e v. : N o v e m b e r 1 1 , 2 0 2 1
C l i m a t e M a s t e r Wa t e r-S o u rc e H e a t P u m p s
32
Electrical – Power & Low Voltage Wiring
Thermostat Connections
- The
thermostat should be wired directly to the
CXM2 board. See “Electrical – Thermostat”
for specific terminal connections. Review
the appropriate AOM (Application,
Operation and Maintenance) manual for
units with DDC controls.
Low Water Temperature Cutout
Selection -
Do not clip the JW3 jumper,
which lowers the sensing temperature
associated with thermistor LT1 and LWT
connected to the board, unless the unit
is working with a minimum of 20% brine
solution, in which case, the jumper can
be clipped. Entering water temperatures
below the products operational range will
damage the braze plate heat exchanger
and cause critical failure. Note that the LT1
thermistor is located on the refrigerant line
between the braze plate heat exchanger
and expansion device (TXV). LWT
thermistor is located on the water line
leaving the braze plate heat exchanger.
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.
Low Pressure Switch Cutout Selection
-
TRL units are equipped with two low
pressure switches which are monitored by
the CXM2 unit controller. If the JW3 jumper
is not clipped, the board will look for the
pressure switch wired on the LP-J3 input
and ignore the T4-J8 input. If JW3 jumper is
clipped, the board will look for the pressure
switch wired on T4-J8 and ignore the LP-J3
input.
Pump or Motorized Water Valve Relay
-
If an internal pump or mwv is selected
as one of the options, it will be controlled
by a 24VDC relay connected to EH1 on
the CXM2 board, allowing independent
control from CC.