Troubleshooting | 39LV Heat Pump Series
8 733 905 683 (2016/09)LV Heat Pump Series
High humidity
X
Air flow too high
Fan speed setting too
high
Consult blower performance table
and reduce fan speed if possible.
Loss of refrigeration
capacity
Low refrigerant
Check refrigerant pressures with
gauge set.
Short cycling
Unit oversized
Check unit performance against
building load calculations.
Poor thermostat location
Make sure that thermostat is not
located by a supply air duct .
Objectionable noise
levels
X X
Air noise
Poor duct work/grille
design
ensure duct work and grilles are
properly sized for unit air flow.
Fan speed setting too
high
Consult blower performance table
and reduce fan speed if possible.
Structure bourne
noise
Unit not mounted on full
vibration pad
Mount unit on a vibration pad (see
page 7).
Unit not connected with
flexible conduit, water
lines and/or duct work
Install unit in accordance with
instructions on pages 6-8.
Unit cabinet touching wall
or other building
component
Adjust unit location to avoid unit
touching structure.
X
Compressor noise
High water temperature
or low water flow rate
elevating head pressure
Increase water flow rate and/or
reduce water temperature if
possible.
Scaled or fouled water
coil elevating heat
pressure
Clean/de scale water coil.
X
Low air flow elevating
head pressure
Check filter.
Increase fan speed.
X
X Water hammer
Fast closing valves
installed
change valves to slow-close type.
UNIT TROUBLESHOOTING
Problem Mode Check Possible Cause Action
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