Ground
The UPM controller takes its ground
reference from the unit chassis which is
connected to the controller via the C-GND
spade terminal.
DIP Switch Settings
The DIP switch is used to configure most of
the available features of the UPM as follows:
Alarm mode, Constant or Pulse
Reset mode, Y signal or R signal
Lockout mode, two (2) or four (4)
Strikes
Test mode, Normal or Test operation
The settings shown below are factory default
for most heat pump applications, however
the Unit wiring diagram is the ultimate guide
for factory DIP switch default settings.
Figure 2 - Dip switch settings
The following table is available on the UPM
board as well and it depicts the switch
position and its associated functionality.
Selectable Alarm Mode
The UPM controller can be configured to
have either a constant signal or a pulse.
If constant (CONT) is selected the UPM will
provide a closed contact until the alarm is
cleared.
If pulsed (PULSE) is selected the UPM will
sequence the alarm contact with the fault
LED flashes.
Freeze protection
The default setting for the freeze limit trip is
30°F; however this can be changed to 15°F
by cutting the R17 for Compressor 1 and
R77 for Compressor 2 resistor located on
top of the DIP switch SW1.
The UPM controller will constantly monitor
the refrigerant temperature with the sensor
mounted close to the condensing water coil
between the thermal expansion valve and
water coil as shown in figure 4.
UPM DIP SWITCH CONFIGURATION
4
LOCKOUT 4 2
3
RESET
R
Y
2
ALARM CONT
PULSE
1
TEST
YES
NO
Figure 3 - DIP switch table
ON
1
2
3
4
LOCKOUT
RESET
ALARM
TEST
7
