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TranquiliTy® 30 (SE) PrEMiEr TWO-STaGE SEriES– iOM
Models:
SE
Electrical: Low Voltage Wiring
024-072
THERMOSTAT CONNECTIONS
The thermostat should be wired directly to the
DXM2.5 board. See Electrical: Thermostat Wiring
for specific terminal connections. Review the
appropriate AOM (Application, Operation and
Maintenance) manual for units with DDC controls.
LOW WATER TEMPERATURE
CUTOUT SELECTION
The DXM2.5 control allows the field selection of low
water (or water-antifreeze solution) temperature
limit by clipping jumper JW3 (see the figure below),
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).
PA G E : 4 0
C r e a t e d : M a r c h 6 , 2 0 2 4
Actual area is 3.5313" w x 8.875"h
Guides indicate .125" bleed all around
Figure 15: LT1 Limit Setting
Fault
Status
O
On
O
S3
O
On
A0-1
S1
P11
T1
T2
T2
Gnd
Gnd
AO2
JW3-LT1 jumper should be clipped for low
temperature (antifreeze) solution.
Therefore, LT1 is sensing refrigerant temperature, not
water temperature, which is a better indication of
how water flow 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 the figure below 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.
On
JW3
12
RV
Relay
CCH
Relay
S2
A0-2
Comp
Relay
P10
P9
T3
T3
T4
T4
T5
T5 T6 T6
DXM2.5 PCB
LP
LT1
LT1
LT2
LT2
RV
RV
CO
CO
P7
1
24Vdc
EH1
4
EH2
P6
CCG
CC
w w w. c l i m a t e m a s t e r. c o m
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Troubleshooting
