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NUMBER
1
Board Power Indicator
2
UPM Status LED Indicator
Water Source Coil Freeze Protection Temperature
3
Load Water Coil Freeze Protection Temperature
4
5
UPM Board Settings
6
Source Coax Freeze Connection (Freeze 1)
7
Load Coax Freeze Connection (Freeze 2)
8
LCD Unit Display Connection
9
10
Compressor Contact Output
11
High Pressure Switch Connection
12
Call for Compressor Y1
13
Low Pressure Switch Connection
14
24VAC Power Common
Condensate Overflow Sensor
15
(not applicable on 50PSW)
16
17
UPM Ground Standoff
Fig. 16 — UPM I Control Board
(Single Compressor Units)
Fig. 17 — Freeze Protection Sensor
ITEM
Selection (R30)
Selection (R24)
24VAC Power Unit
Dry Contact
Freeze
Protection
Sensor
NUMBER
1
2
3
Source Freeze 1 Protection Temperature Selection (R17)
4
Load Freeze 2 Protection Temperature Selection (R77)
5
6
7
Load Coax Freeze Connection (Freeze 2)
8
9
10
11
High Pressure Switch 1st Stage
12
13
14
Low Pressure Switch 2nd Stage
15
16
High Pressure Switch 2nd Stage
17
Condensate Switch (Not Applicable)
18
19
Fig. 18 — UPM II Control Board
(Dual Compressor Units)
UPM CONFIGURATION
Several of the UPM features are configurable via dip switches on
the UPM. Table 5 outlines the default configuration.
Table 5 — UPM Default Configurations
SWITCH
DIP SWITCH
NUMBER
LABEL
1
Test
2
Alarm
3
Reset
4
Lockout
UPM FEATURES
Anti-Short Cycle Timer
5-minute delay on break timer to prevent compressor short
cycling.
Random Start
Each controller has a unique random start delay ranging from 270
to 300 seconds on initial power up to reduce the chance of
multiple units simultaneously starting at the same time (after
22
ITEM
Power LED Indicator
Status LED Indicator
UPM II Board Settings
Freeze Connection (Freeze 1)
Power 24VAC-R
Compressor 1 Control Output
Compressor 2 Control Output
Thermostat Y1 Call
Low Pressure Switch 1st Stage
Thermostat Y2 Call
Alarm Output Dry Contact N.O.
Ground Connection
ON FUNCTION
FUNCTION
(DEFAULT)
YES
Continuous
R (T-Stat)
Y (Unit Power)
4
OFF
NO
Pulse
2
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