Model
Voltage
Code
Voltage
Min/Max
Voltage
Compressor
HWG
Pump
FLA
EXT Loop
Pump
FLA
Total
Unit
FLA
Min
Circuit
Amps
Max
Fuse/
HACR
QTY RLA LRA
036 3 208-230/60/1 187/254 1 16.7 79 0.4 4 16.7 20.8 35
060 3 208-230/60/1 187/254 1 26.3 134 0.4 4 26.3 32.9 50
120 3 208-230/60/1 187/254 2 26.3 134 0.4 4 52.6 59.2 80
HACR circuit breaker in USA only
Residential units come standard with 75VA transformer, HWG pump, and HWG connections
Electrical - Low Voltage
Changing FP1-Low Water Temperature
Cutout Setpoint
CXM PCB
JW3-FP1 jumper
should be
clipped when
antifreeze is
used.
Electrical Data
Low Water Temperature Cutout Selection
The CXM 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 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 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
19 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].
Wa t e r- t o - W a t e r ( 5 0 Y E R ) S e r i e s - P u r o n
®
R e v. : 1 J u l y, 2 0 1 0
18
Table 4: 50YER Electrical Data
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