Unit Controls - UPM
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13
Revised 08/14
8 733 914 818 (2014/08)
SV Heat Pump Series
Airflow Selector
The airflow selector (Figure #7, items [2] & [3])
allows airflow adjustment to meet application
requirements and to ease troubleshooting.
ADJUST Selector can be adjusted to NOM, (+), (-),
or TEST. NOM, (+) and (-) can be adjusted as
needed by application. TEST is used for
troubleshooting to override unit airflow to 100%
Figure # 8
The other DIP switch bank is used to select the
proper program in the ECM motor for the unit.
Dehumidification Method Selector
Dehumidification method selector (Figure #7, item
[11]) is used to select between the following two
methods:
1. Units equipped with optional Hot Gas Reheat,
on dehumidification call (the “H” terminal on
the thermostat is energized) the reheat
outputs will energize the hot gas reheat valve
in the circuit and the heat pump will start in
dehumidification mode. Dehumidification
selector (Figure #7, item [11]) should be
selected to ‘YES’.
2. Units without optional Hot Gas Reheat, on
dehumidification call, the heat pump fan will
operate at a lower speed to increase
dehumidification while cooling.
Dehumidification selector ((Figure #7, item
[11]) should be selected to ‘NO’.
3. To the left of the red and green status LED’s is
a row of 1/4” male quick connects. These are
used to pass thermostat inputs on to the rest
of the control circuit. Remember to always turn
off unit power at the circuit breaker before
attaching or disconnecting any wiring from
these connections to avoid accidental short
circuits that can damage unit control
components.
Dehumidification indicator LED (Figure #7, item
[4]) will energize when dehumidification call is
present. Refer to Figure #9.
Figure # 9
C1
Transformer 24 VAC Common (primary
connection)
R
Transformer 24 VAC Hot
H
Dehumidification Mode
Only one switch can be enabled at a time. Refer
to Figure #9 for each airflow setting.
NOTE:
CFM Selector (FIg #7, Item [2]) must
remain with only “A” being enabled.
NOTE
: Do not set the ADJ DIP switch to the
(-) setting when electric heaters are
installed. Doing so may cause the heaters to
cycle on their thermal overload switches,
potentially shortening the life of the
switches.
Thermostat Options
Y1
First Stage Compressor Operation
NOTE:
Always disconnect power before
changing jumper positions on the interface
board and reset the unit afterward.
In this mode, the heat pump will only dehumidify
the space when it is running in cooling mode.
