Units Controls - UPM | 11LV Heat Pump Series
8 733 905 683 (2013/04)LV Heat Pump Series
UNITS CONTROLS - UPM
ECM Interface Board
Thermostat wiring is connected to the 10 pin
screw type terminal block on the lower center
portion of the ECM Interface Board. In addition to
providing a connecting point for thermostat wiring,
the interface board also translates thermostat
inputs into control commands for the Electronic
Commutated Motor (ECM) DC fan motor and
displays an LED indication of operating status. The
thermostat connections and their functions are as
follows:
Figure # 5
[1] Motor harness plug
[2] Blower CFM adjustment
[3] Motor settings
[4] Dehumidification indication
[5] Thermostat digital inputs
[6] CFM count indicator
[7] Thermostat input status indication
[8] Reheat digital outputs
[9] Thermostat outputs
[10] 24 VAC
Figure # 6
Table 2: Low Voltage VA Draw
Standard Construction Hot Gas Reheat or
Economizer
Optional Components
Component
VA
Component
VA
Component
VA
Blower Relay (PSC
motors only)
6-7
Total from ‘Standard’
22-26
Monitor Relay (VA draw
per relay)
6-7
Reversing Valve
Solenoid
8-9
Additional Control
Relays
12-14
Internal 2 Way
Motorized Valve
7
Compressor Contactor
6-8
Hot Gas Reheat
Solenoid
8-9
LED Annunciator
1
UPM board
2
Total VA draw
22-26
Total VA draw
42-49
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