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52
Objectionable
noise levels
X
X
Air noise
Poor ductwork/grille design
Ensure ductwork and grilles are properly sized for unit
airflow.
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.
Unit not connected with
flexible conduit, water lines
and/or ductwork
Install unit in accordance with instructions.
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/descale water coil.
X
Low airflow elevating head
pressure
Check filter.
Increase fan speed.
X
X
Water hammer
Fast closing valves installed
Change valves to slow-close type.
Table 30 — Troubleshooting (cont)
FAULT
COOLING HEATING
CHECK
POSSIBLE CAUSE
SOLUTION