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12 | Installation
Step 9- Wire Field Controls
Units Controls ECM-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
shown in figure # 9
10
8
9
7
6
Figure # 9
[1] Motor harness plug
[2] Blower CFM adjustment
[3] Motor settings
[4] Dehumidification indication
[5] Thermostat contact inputs
[6] CFM count indicator
[7] Thermostat input status indication
[8] Reheat digital outputs
[9] Thermostat outputs
[10] 24 VAC
[11] Hot gas Re-heat enable switch
8 733 944 336 (2016/09)
1
3
11
5
2
4
Subject to change without prior notice
Safety devices and the UPM control
Each unit is factory provided with a UPM board
controller that controls the compressor operation and
monitors the safety.
If the unit is being connected to a thermostat with a
malfunction light, this connection is made at the unit
malfunction output or relay.
1
2
3
4
5
17
15
7
Figure # 10
[1] Board Power Indicator
[2] UPM Status LED Indicator
[3] Water Coil Freeze Protection Temperature Selection
[4] Air Coil Freeze Protection Temperature Selection
[5] UPM Board Settings
[6] Water Coil Freeze Connection
[7] Air Coil Freeze Connection
[8] LED Unit Display 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
LV Heat Pump Series
11
13
12
9
10
LV Heat Pump Series
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