Unit Noise Troubleshooting - Bosch Greensource SM024 Installation, Operation And Maintenance Manual

52 | Unit Troubleshooting

Unit Noise Troubleshooting

Problem
OBJECTIONABLE
NOISE LEVELS
Table 12 Unit Noise Troubleshooting
8733819578 (2019/02)
Mode
Cooling Heating
Air noise
X X
Structure-
bourne noise
Compressor
X X
noise
X X Water hammer
Subject to change without prior notice
Check Possible Cause
Poor ductwork/
grill design
Fan speed setting
too high
Unit not mounted
on full vibration
pad
Unit not
connected with
flexible conduit,
water lines, and/or
ductwork
Unit cabinet
touching wall or
other building
components
High water
temperature 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
installed
Greensource CDi Series SM
Action
Ensure the ductwork and
grills are properly sized
for the unit air flow.
Consult blower
performance table and
reduce fan speed if
possible.
Mount unit on vibration
pad. See "Mounting
Vertical (VT) Units" on
page #16.
Install unit in accordance
with the instructions on
page #8 through page
#27.
Adjust unit location to
avoid unit touching
structure.
Increase water flow rate
and/or reduce water
temperature if possible.
Clean/descale water coil.
Check filter.
Increase fan speed.
Change valves to
slow-close type.
Greensource CDi Series SM Model