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Units Controls - UPM
LV Heat PumpSeries
LV Heat Pump Series
8 733 905 683 (2013/04)
Subject to change without prior notice
Just above the connector block is a single red LED
labeled CFM that will blink intermittently when the
unit is running and may flicker when the unit is off.
This LED indicates the air delivery of the blower at
any given time. Each blink of the LED represent
approximately 100 CFM of air delivery so if the LED
blinks 12 times, pauses, blinks 12 times, etc. the
blower is delivering approximately 1200 CFM.
To the right of the thermostat connection block is
a green LED labeled dehumidify. Just above and to
the right of the thermostat connection block are
two banks of DIP switches labeled ADJ and CFM.
The ADJ bank DIP switches are labeled NORM, (+),
(-), Test and HGHR position from the factory,
however, airflow can be increased (+) or
decreased (-) by 15% from the pre-programmed
setting by relocating the DIP switch in this section.
The TEST position is used to verify proper motor
operation. If a motor problem is suspected, move
the ADJ DIP switch to the TEST position and
energize G on the thermostat connection block. If
the motor ramps up to 100% power, then the
motor itself is functioning normally. Always
remember to replace the DIP switch to NORM, (+)
or (-) after testing and reset the unit thermostat to
restore normal operation.
HGRH switch is used to select operating mode
between units equipped with:
1. Re-heat coils
2. Cool to dehumidify
When the HGRH DIP switch (Figure 7) is set to
“YES” the heat pump is configured for hot gas
reheat. With hot gas reheat, when there is a call
for dehumidification (the “H” terminal on the
thermostat is energized) the reheat digital outputs
(Item 8 on Figure 6) will energize the hot gas
reheat valve in the hot gas reheat circuit and the
heat pump will start in dehumidification mode.
When the HGRH DIP switch is set to “NO” the heat
pump is set for passive dehumidification. When
“H” is energized and there is a call for cooling, the
heat pump fan will operate at a lower speed to
increase dehumidification while cooling. Note that
in this mode, the heat pump will only dehumidify
the space when it is running in cooling mode..
The other DIP switch bank is used to select the
proper program in the ECM motor for the unit.
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.
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)
C1
Transformer 24 VAC Common
(primary connection)
R
Transformer 24 VAC Hot
H
Dehumidification Mode
CFM LED indication is an approximation. Utilize
conventional Test and Balance equipment for
accurate airflow measurement.
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.
Always disconnect power before changing
jumper positions on the interface board and
reset the unit afterward.
