Electrical - Low Voltage; Electrical Data - Carrier 50YER036 Installation, Operation And Maintenance Instructions

W a 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

Electrical Data

Table 4: 50YER Electrical Data
Voltage
Model
Code
036 3
060 3
120 3
HACR circuit breaker in USA only
Residential units come standard with 75VA transformer, HWG pump, and HWG connections
Changing FP1-Low Water Temperature
Cutout Setpoint
CXM PCB
18
Min/Max
Voltage
Voltage
QTY
208-230/60/1 187/254 1
208-230/60/1 187/254 1
208-230/60/1 187/254 2

Electrical - Low Voltage

JW3-FP1 jumper
should be
clipped when
antifreeze is
used.
®
HWG
Compressor
Pump
RLA LRA
FLA
16.7 79 0.4
26.3 134 0.4
26.3 134 0.4
Low Water Temperature Cutout Selection
The CXM control allows the field 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 flow 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].
EXT Loop Total Min
Pump Unit Circuit
FLA FLA Amps
4 16.7 20.8
4 26.3 32.9
4 52.6 59.2
Max
Fuse/
HACR
35
50
80