Bosch SV007 Installation, Operation And Maintenance Manual page 37

Revised 08/14
Problem
High humidity
Objectionable noise
levels
SV Heat Pump Series
UNIT TROUBLESHOOTING
Mode Check
Air flow too high
Loss of refrigeration
capacity
X
Short cycling
Air noise
X X
Structure bourne
noise
X
Compressor noise
X
X X Water hammer
Possible Cause
Fan speed setting too Consult blower performance table
high and reduce fan speed if possible.
Check refrigerant pressures with
Low refrigerant
Check unit performance against
Unit oversized
Make sure that thermostat is not
Poor thermostat location
located by a supply air duct .
Poor duct work/grille Insure duct work and grilles are
design properly sized for unit air flow.
Fan speed setting too Consult blower performance table
high and reduce fan speed if possible.
Unit not mounted on full Mount unit on a vibration pad (see
vibration pad
Unit not connected with
Install unit in accordance with
flexible conduit, water
lines and/or duct work
Unit cabinet touching
Adjust unit location to avoid unit
wall or other building
component
High water temperature Increase water flow rate and/or
or low water flow rate
elevating head pressure
Scaled or fouled water
coil elevating heat
pressure
Low air flow elevating
head pressure
Fast closing valves
change valves to slow-close type.
installed
Troubleshooting | 37
Action
gauge set.
building load calculations.
page 7).
instructions on pages 6-8.
touching structure.
reduce water temperature if
possible.
Clean/descale water coil.
Check filter.
Increase fan speed.
8 733 914 818 (2014/08)