SECTION 24: T
ROUBLESHOOTING
137 of 154
24.1 Initial Checks
When enco
u
ntering any abnormal operation or fa
u
lt conditions of the eq
u
ipment, all tro
u
bleshooting sho
u
ld
start
w
ith the follo
w
ing initial checks. If a problem is disco
v
ered in these initial checks it m
u
st be corrected
before mo
v
ing on in the tro
u
ble shooting.
1. Compare
v
oltage and phase of s
u
pply po
w
er on site
w
ith rating plate information.
2.
Re
v
ie
w
w
iring bet
w
een remote panel and control panel. Do the electrical connections match the s
u
p-
plied
w
iring diagram?
3.
Compare gas type and s
u
pply press
u
re on site
w
ith rating plate information.
4.
Check for proper blo
w
er rotation on air handler and any exha
u
st blo
w
ers.
• Blo
w
ers po
w
ered
w
ith a three phase motor can be re
v
ersed by s
w
apping any t
w
o incoming po
w
er
legs. For blo
w
ers po
w
ered by a single phase motor refer to the motor rating plate for re
v
ersing
instr
u
ctions.
24.2 Motor and Blower
PROBLEM
POSSIBLE CAUSE
SOLUTION
Motor does not operate
Main disconnect s
w
itch is OFF
T
u
rn disconnect to ON
Blo
w
n f
u
se(s) in disconnect
Replace f
u
se(s)
Blo
w
n f
u
se(s)/breaker tripped in control transformer Replace f
u
se(s)/reset breaker (
w
ith
disconnect off)
Fan s
w
itch on
Check
w
iring bet
w
een remote panel
and air handler. Replace s
w
itch.
Optional: Damper does not open
Check that damper is not obstr
u
cted
Check that linkage is tight and
sec
u
re
Replace damper act
u
ator
Motor starter (contactor) does not operate.
Replace starter
Tripped motor o
v
erload. Po
w
er o
u
t to MUA motor
w
hen motor starter is energized?
Reset
Check for proper FLA setting
Replace o
v
erload
If applicable: Tighten scre
w
s on
heater packs or o
v
erload.
Optional: Lo
w
limit s
w
itch set to high
Re-adj
u
st lo
w
limit s
w
itch setting
Blo
w
er does not operate
Belts broken or loose?
Replace/tighten belts
Loose motor or blo
w
er shea
v
es (p
u
lleys)
Reinstall and properly torq
u
e set-
scre
w
s
Blo
w
er bearings, do they t
u
rn freely?
Replace bearing(s)
Summary of Contents for 4044
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