Unit Controls - Upm; Ecm Interface Board - Bosch SV007 Installation, Operation And Maintenance Manual

12 | Unit Controls - UPM

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.
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
Component VA
Blower Relay
6-7
(PSC motors only)
Reversing Valve
8-9
Solenoid
Compressor
6-8
Contactor
UPM board
22-26
Total VA draw
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.
8 733 914 818 (2014?08)
Hot Gas Reheat
Component VA
Total from
22-26
'Standard'
Additional
Control 12-14
Relays
Hot Gas
Reheat 8-9
Solenoid
2
Total VA
42-49
draw
Subject to change without prior notice
10
8
9
7 6
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 LED indication is an approximation. Utilize
conventional Test and Balance equipment for
accurate airflow measurement.
• 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.
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)
SV Heat PumpSeries
1
3
5 4
11
SV Heat Pump Series