Installation, Operation, and Maintenance Manual
CA Series Heat Pumps - 8733851021 (2025/04) US
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11.1 UPM Default Settings and DIP Switch Positions
O
1
2
34
5
6
7
N
CTS 208-7 T126
OFF
Figure 9 UPM Settings DIP Switch (SW1)
UPM DIP Switch Selectable Positions
Position Function ON OFF Factory Default
1 Lockout 4 2 2
2 Reset R Y Y
3 Alarm Cont Pulse Pulse
4 Test Yes No No
5 Freeze 1 15°F 25°F 25°F
6 Freeze 2 15°F 25°F 25°F
7 Pump ON OFF OFF
Table 3 UPM DIP Switch Selectable Positions
11.2 UPM Board Features
The UPM Board includes the following features:
• ANTI-SHORT CYCLE TIMER: Five-minute delay on break timer to prevent
compressor short cycling.
• COMPRESSOR MINIMUM RUN TIME: The UPM has a minimum
compressor run time of five minutes. If Y-call is removed the compressor
will remain energized until the five minutes have expired. Unit blower
operates independently.
• RANDOM START: Each controller has an unique random start delay
ranging from 270 to 300 seconds on initial power up to reduce the chance
of multiple unit simultaneously starting at the same time after power up
or after a power interruption, in order to avoid creating a large electrical
spike.
• TEST DIP SWITCH: The DIP switch position “4” controls the Test function.
When it is set to “ON,” it will reduce all time delays settings to 10 seconds
during troubleshooting or verification of unit operation. (Refer to Figure 7,
item [10].) (Refer to Figure 9.)(See Table 3.)
NOTICE
Product damage
NOTICE
!
Operation of the unit in test mode can lead to accelerated wear and premature
failure of components. The "TEST" switch must be set back to "OFF" after
troubleshooting/servicing.
• LOW-PRESSURE BYPASS TIMER: If the compressor is running and the
low-pressure switch opens, the controller will keep the compressor ON for
120 seconds. After two minutes if the low-pressure switch remains open,
the controllers will shut down the compressor and enter a soft lockout.
The compressor will not be energized until the low-pressure switch closes
and the anti-short cycle time delay expires. If the low-pressure switch
opens two or four times in one hour, the unit will enter a hard lockout. In
order to exit a hard lockout, power to the unit would need to be reset. The
reset signal is either a Y or R signal depending on if DIP switch position “2”
is set to ON or OFF. (Refer to Figure 9.)(See Table 3.) If it set to ON, the
board must be manually powered OFF and powered back ON to exit the
hard lock out.
• BROWNOUT/SURGE/POWER INTERRUPTION PROTECTION: The
brownout protection in the UPM board will shut down the compressor if
the incoming power falls below 18 VAC. The compressor will remain OFF
until the voltage is above 18 VAC and ANTI-SHORT CYCLE TIMER (300
seconds) times out. The unit will not go into a hard lockout.
• MALFUNCTION OUTPUT: Alarm output is Normally Open (NO) dry
contact. If pulse is selected the alarm output will be pulsed. The fault
output will depend on the DIP switch setting for "ALARM." (Refer to Figure
9.)(See Table 3.) If DIP switch position “3” is set to “ON,” a constant signal
will be produced to indicate a fault has occurred and the unit requires
inspection to determine the type of fault. If it is set to“OFF," a pulse signal
is produced and a fault code is detected by a remote device indicating the
fault. (For blink code explanation, see Table 4.) The remote device must
have a malfunction detection capability when the UPM board is set to
"PULSE."
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