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LV Heat Pump Series
Table 2: Low Voltage VA Draw
Standard Construction
Component
Blower Relay (PSC
motors only)
Reversing Valve
Solenoid
Compressor Contactor
UPM board
Total VA draw
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:
10
8
9
7
6
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
LV Heat Pump Series
Hot Gas Reheat or
Economizer
VA
Component
6-7
Total from 'Standard'
Additional Control
8-9
Relays
Hot Gas Reheat
6-8
Solenoid
2
22-26
Total VA draw
1
3
5
2
4
Optional Components
VA
Component
Monitor Relay (VA draw
22-26
per relay)
Internal 2 Way
12-14
Motorized Valve
8-9
LED Annunciator
42-49
[9] Thermostat outputs
[10] 24 VAC
Figure # 6
Units Controls - UPM | 11
VA
6-7
7
1
8 733 905 683 (2013/04)
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