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Step 9 — Configure Unit Control Components
WARNING
To avoid possible injury or death due to electrical shock, open
the power supply disconnect switch and secure it in an open
position during installation.
UNIT PROTECTION MODULE (UPM)
All units with Better B, Complete C, Deluxe D, or WSHP Open
are factory provided with a unit protection module (UPM)
controls the compressor and has built safeties. See Fig. 35.
1
2
3
4
5
17
15
7
STANDARD CONSTRUCTION
Component
Blower Relay
(PSC Motors Only)
Reversing Valve Solenoid
Compressor Contactor
UPM Board
Total VA Draw
11
13
12
9
10
Fig. 35 — Unit Protection Module (UPM)
Table 8 — Low Voltage VA Draw
HOT GAS REHEAT OR ECONOMIZER
VA
Component
6-7
Total from 'Standard'
8-9
Additional Control Relays
6-8
Hot Gas Reheat Solenoid
2
—
22-26
Total VA draw
Freeze Sensor
The default setting for the freeze limit trip is 26°F for applications
without anti-freeze. This can be changed to 15°F for applications
with anti-freeze by cutting the R30 resistor located on top of the
DIP switch SW1.
If unit is employing a fresh water system (no anti-freeze
protection), it is extremely important to have the Freeze1 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.
1
Board Power Indicator
2
UPM Status LED Indicator
3
Water Coil Freeze Protection Temperature Selection [R30]
4
Air Coil Freeze Protection Temperature Selection
5
UPM Settings
6
Water Coil Freeze Connection
7
Air Coil Freeze Connection
8
LED Status-Diagnostic Connection
9
24VAC Power Input
10
Compressor Contact Output
11
High Pressure Switch Connection
12
Call for Compressor Y1
13
Low Pressure Switch Connection
14
24VAC Power Common
15
Condensate Overflow Sensor
16
Dry Contact
17
UPM Ground Standoff
VA
Monitor Relay (VA draw
22-26
12-14
Motorized Valve
8-9
—
42-49
35
CAUTION
OPTIONAL COMPONENTS
Component
VA
6-7
per relay)
Internal 2 Way
7
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