All installations and services must be performed by qualified personnel.
complete
•
Perform motor/control replacement check
•
Blower won’t shut off
•
Current leakage from controls into G,Y or W?
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
18
Содержание AH2436E1
Страница 26: ......
