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Unit Controls - UPM
SV Heat PumpSeries
SV Heat Pump Series
8 733 914 818 (2014?08)
Subject to change without prior notice
Table #2 shows the VA draw of factory mounted
components in the SV heat pump. The total VA
draw of the heat pump internal components plus
any attached accessories must be lower than the
VA capacity of the unit control transformer.
UNIT 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 (Refer to
Figure #7, item [5]). 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 # 7
[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] Dehumidification method selector
•
CFM Count Indicator (Figure #7, Item [5])
blinks to indicate approximate airflow in CFM
and may flicker when unit is off. Each blink of
the LED represents approximately 100 CFM of
air delivery, for example, if the LED blinks 12
times, pauses, blinks 12 times, etc. the blower
is delivering approximately 1200 CFM.
NOTE:
Exceeding the transformer capacity
can result in low control voltage, erratic unit
operation or damage to the heat pump.
Table 2: Low Voltage VA Draw
Standard
Construction
Hot Gas Reheat
Component
VA
Component
VA
Blower Relay
(PSC motors only)
6-7
Total from
‘Standard’
22-26
Reversing Valve
Solenoid
8-9
Additional
Control
Relays
12-14
Compressor
Contactor
6-8
Hot Gas
Reheat
Solenoid
8-9
UPM board
2
Total VA draw
22-26
Total VA
draw
42-49
CFM LED indication is an approximation. Utilize
conventional Test and Balance equipment for
accurate airflow measurement.
Thermostat Options
Y1
First Stage Compressor Operation
G
Fan
O
Reversing Valve (energized in cooling)
W1
Auxiliary Electric Heat (runs in
conjunction with compressor)
NC
Transformer 24 VAC Common (extra
connection)
10
1
7
8
9
5
4
6
3
11