ClimateMaster DC Series Installation Manual download pdf (Page 21)

Residential H&V - 60Hz R22 &R410A

Rev.: 22 Dec, 2008

climatemaster.com

Electrical - Low Voltage Wiring

Figure 19: TT/TS Low Voltage Field Wiring

Low voltage ﬁ eld wiring for units with ECM fan

Low voltage

ﬁ eld wiring

for units with

PSC FAN

(ECM board

will not be

present)

Figure 20: GS Low Voltage Field Wiring

Figure 21: FP1 Limit Setting

CXM PCB

JW3-FP1

jumper should

be clipped for

low temperature

operation

Rev.: 3/24/00

Contactor - CC

Capacitator

Loop PB1 HWG PB2

CXM Control

Low Voltage

Connector

Transformer

Circ Brkr

Grnd

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

22 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].

Thermostat Connections

The thermostat should be wired directly to the CXM board

(units with PSC fan). Units with optional ECM motor include

factory wiring from the CXM board to the ECM interface

board. Thermostat wiring for these units should be connected

to the ECM interface board. Figure 20 shows wiring for 50YC

units; Figure 19 should be used for TT/TS units with PSC

or optional ECM motor. See “Electrical – Thermostat” for

speciﬁ c terminal connections.

Section 10 - Packaged IOM 21 4/24/09 3:16:51 PM

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ClimateMaster DC Series Installation Manual Page 21

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