Safety Devices and the UPM Controller
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SM Split CS Series Heat Pump
8733825873 (2020/05)
SM Split CS Series Heat Pump
Subject to change without prior notice
Fig. 7 Sensor location
•
The condensate overflow protection sensor is
located in the drain pan of the unit and
connected to the “COND” terminal on the UPM
board. (Refer to Fig. 8)
Fig. 8 Condensate Overflow Protection Sensor
Table 10 UPM Board Factory Default Settings
Table 11 UPM DIP Switch Selectable Positions
The UPM Board includes the following features:
•
ANTI-SHORT CYCLE TIMER:
Five-minute delay
on break timer to prevent compressor short
cycling.
•
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, thus avoiding creating
large electrical spike.
•
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. If after 120
seconds 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 2 or 4 times in 1 hour, the unit
will enter a hard lockout. In order to exit the
hard lockout, power to the unit would need to
be reset. The reset signal is either a Y or R
signal depending on the position of the dip
switch as shown in Table #11. If the reset is set
NOTICE:
If the unit is employing a fresh
water system (no anti-freeze protection), it
is extremely important to have the Freeze 1
R30 resistor set to 26°F in order to shut
down the unit at the appropriate leaving
water temperature and protect your heat
pump from freezing if a freeze sensor is
included.
For Reference
Only
UPM Board Factory Default Settings
TEMP
26°F
LOCKOUT
2
RESET
Y
ALARM
PULSE
TEST
NO
UPM DIP SWITCH SELECTABLE POSITIONS
Lockout
4
2
Reset
R
Y
Alarm
Cont
Pulse
Test
Yes
No
OFF
12
3
4
