All installations and services must be performed by qualified service personnel.
15
Check for Triac switched t’stat or solid state
relay
Excessive noise
Determine if it’s air noise, cabinet, duct or motor
noise – interview customer, if necessary
Noisy blower or cabinet
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
“Hunts” or “puffs” at high CFM (speed)
Does removing panel or filter reduce “puffing”?
Reduce restriction
Reduce max airflow
Evidence of Moisture
Motor failure or malfunction has occurred and
moisture is present
Replace motor and perform
Moisture Check
Evidence of moisture present inside air mover
Perform
Moisture Check
DO
DON’T
Check-out motor, controls, wiring and
connections thoroughly before replacing motor
Automatically assume the motor is bad.
Orient connectors down so water can’t get in
Install “drip loops”
Locate connectors above 7 and 4 o’clock
positions
Use authorized motor and control model #’s for
replacement
Replace one motor or control model # with
another (unless an authorized 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
Use high pressure drop filters – some have ½”
H
2
O drop!
Use restricted returns
Size the equipment wisely
Oversize system then compensate with low
airflow
Check orientation before inserting motor
connectors
Plug in power connector backwards
Force plugs
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
Check and plug leaks in return ducts, cabinet
Comfort Check
Check proper airflow settings
