Crown CSHB60-90XE Operation Manual page 10

All installations and services must be performed by qualified service personnel.
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Stays at high CFM
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Blower won't shut off
Excessive noise
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Noisy blower or cabinet
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"Hunts" or "puffs" at high CFM (speed)
Evidence of Moisture
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Motor failure or malfunction has occurred and
moisture is present
•
Evidence of moisture present inside air mover
•
Check-out motor, controls, wiring and
connections thoroughly before replacing motor
•
Orient connectors down so water can't get in
Install "drip loops"
•
Use authorized motor and control model #'s for
replacement
•
Keep static pressure to a minimum:
Recommend high efficiency, low static
filters
Recommend keeping filters clean
Design ductwork for min static, max
comfort
Look for and recommend ductwork
improvement, where necessary, in
replacement
•
Size the equipment wisely
•
Check orientation before inserting motor
connectors
Moisture Check
•
Connectors are orientated "down" (or as recommended by equipment manufacturer)
•
Arrange harnesses with "drip loop" under motor
•
Is condensate drain plugged?
•
Check for low airflow (too much latent capacity)
•
Check for undercharged condition
DO
•
Verify fan is not in delay mode – wait until delay
complete
•
"R" missing/not connected at motor
•
"R" missing/not connected at motor
•
Is fan in delay mode? – wait until delay time
complete
•
Current leakage from controls into G,Y or W?
•
Determine if it's air noise, cabinet, duct or motor
noise – interview customer, if necessary
•
Check for loose blower housing, panels, etc.
•
High static creating high blower speed?
Check for air whistling thru seams in ducts,
cabinets or panels
Check for cabinet/duct deformation
•
Does removing panel or filter reduce "puffing"?
Reduce restriction
Reduce max airflow
•
Replace motor and perform Moisture Check
•
Perform Moisture Check
•
Automatically assume the motor is bad.
•
Locate connectors above 7 and 4 o'clock
positions
•
Replace one motor or control model # with
another (unless an authorized replacement)
•
Use high pressure drop filters – some have ½"
H O drop!
2
•
Use restricted returns
•
Oversize system then compensate with low
airflow
•
Plug in power connector backwards
•
Force plugs
8
DON'T