Installation, Operation, and Maintenance Manual
CA Series Heat Pumps -8733851021 (2025/04) US
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Blinks Fault Fault Criteria
None None All fault conditions normal.
1 High Pressure
Refrigerant discharge pressure has
exceeded 600 PSIG.
2 Low Pressure
Refrigerant suction pressure has fallen
below 40 PSIG.
3
Water Coil Freeze Condi-
tion
Refrigerant temperature to the water coil
has fallen below 25°F for 120 seconds.
4 Condensate Overow
Condensate levels in the unit drain pan are
too high.
5 Brownout Control voltage has fallen below 18 VAC.
6 Air Coil Freeze Condition
Refrigerant temperature to the air coil has
fallen below 25°F for 120 seconds.
7 Refrigerant Leak Fault Refrigerant LFL% is more than 15%.
Table 4 UPM Fault Blink Codes
• FREEZE SENSOR: The default setting for the freeze limit trip is 25°F
(FREEZE 1); however, this can be changed to 15°F by flipping the DIP
switch position “5” (Refer to Figure 7, item [10]) (Refer to Figure 9),
freeze limit trip should only be changed to 15°F when a closed loop
system with appropriate antifreeze mixture is used. Since Freeze Sensor
2 is dedicated to monitoring the load side coil, it is recommended
to leave the factory default setting on the board. The UPM controller
will constantly monitor the refrigerant temperature with the sensor
(FREEZE 1) mounted close to the condensing water coil between the
thermal expansion valve and the water coil. If the temperature drops
below or remains at the freeze-limit trip for 120 seconds, the controller
will shut the compressor down and enter into a soft-lockout condition.
Both the status LED and the alarm contact will be active. The status LED
will be active, blinking the fault code. The LED will flash (three times)
the code associated with this alarm condition. If this alarm occurs two
times (or four if DIP switch position “1” is set to “ON”) within an hour, the
UPM controller will enter into a hard-lockout condition. It will constantly
monitor the refrigerant temperature with the sensor (FREEZE 2) mounted
close to the air coil between the thermal expansion valve and air coil,
as shown in Figure 8. If the temperature drops below or remains at the
freeze limit trip for 120 seconds, the controller will shut the compressor
down and enter into a soft-lockout condition. Both the status LED and
the alarm contact will be active. The status LED will be active, blinking
the fault code. The LED will flash six times the code associated with this
alarm condition. If this alarm occurs two times (or four times if DIP switch
position “1” is set to “ON”)(Refer to Figure 9)(See Table 3) within an hour,
the controller will enter into a hard-lockout condition.
NOTICE
Product damage
NOTICE
!
The freeze sensor (FREEZE 1) will not guard against the loss of water. A flow switch
is recommended to prevent the unit from running if water flow is lost or reduced.
• INTELLIGENT RESET: If a fault condition is initiated, the five-minute delay
on break time period is initiated and the unit will restart after these delays
expire. During this period the fault LED will indicate the cause of the fault.
If the fault condition still exists or occurs two or four times (depending
if the Lockout DIP switch position “1” is set to “OFF” or “ON”) (Refer to
Figure 9)(See Table 3) before 60 minutes, the unit will go into a hard
lockout and requires a manual lockout reset.
• LOCKOUT RESET: The method to exit a hard lockout depends of the Reset
DIP switch setting:
◦
To clear a hard lockout when the DIP switch position “2” is set to
“OFF” (Y), power can be cycled OFF then back ON either at the
unit’s thermostat or at the circuit breaker.
◦
To clear a hard lockout when the DIP switch position “2” is set to
“ON” (R), power must be cycled OFF then back ON at the circuit
breaker (not at the thermostat).
(Refer to Figure 9.) (See Table 3.)
The blower motor will remain active during a lockout condition.
• PUMP DIP SWITCH: When DIP switch position “7” is set to “ON” and no
Y call has been received in the past 8 hours, the compressor will have
a delay of 30 seconds to allow a loop pump to circulate water before
compressor starts. (Refer to Figure 9.) (See Table 3.)
• CONDENSATE SENSOR: The condensate sensor operates by looking for
continuity to ground; a fault is triggered if continuity is found.
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