| SYMPTOM |
POSSIBLE
CAUSES |
REMEDY |
| Unit fails to start or deliver
air |
No electrical power to unit |
Check power |
| Fuse blown
|
Replace fuse*
|
| Circuit breaker tripped |
Reset breaker* |
| Belt improperly
adjusted or broken |
Adjust belt
tension |
| Motor overheated and/or frozen |
Replace motor |
| Belt too tight
or broken |
Adjust belt
tension or replace |
| Blower wheel bearings |
Lubricate or replace blower dry/shaft
frozen bearings |
| Motor overloaded
|
Using ammeter,
adjust motor to full load nameplate amps |
| Faulty wiring or shorts |
Call electrician |
| |
*If condition
persists, call electrician |
| |
|
|
| Symptom
|
Possible
Causes |
Remedy |
| Unit starts but air delivery
inadequate |
Lack of sufficient air exhaust
|
Open windows or doors to increase
ventilation |
| Motor underloaded
|
Using ammeter,
adjust motor to full (ducted units only) load nameplate amps
|
| Belt too loose |
Adjust belt tension or replace
if needed |
| |
|
|
| Symptom
|
Possible
Causes |
Remedy |
| Inadequate cooling |
Inadequate exhaust in building |
Open windows or doors to increase
ventilation |
| Air registers
improperly positioned |
Adjust to direct
air as desired or install lower restriction registers |
| Insufficient water / pad not
wet |
Check water distribution system |
| Pads plugged
|
Replace pads |
| Dry or open spots on pads |
Repack pads |
| Trough holes
clogged |
Clean troughs
and unplug holes |
| Pump not working |
Disconnect pump. Clean impeller
housing of foreign matter and reinstall |
| Loose connections
in water system |
Check for leaks
and correct |
| Distributor clogged or corroded
|
Clean or replace |
| Insufficient
bleed-off water |
Reset or replace
bleed-off kit |
| Pump basket clogged |
Clean or replace
|
| |
|
|
| Symptom
|
Possible
Causes |
Remedy |
| Motor cycles or fails to operate |
Excessive belt tension |
Adjust belt tension |
| Blower shaft
tight or frozen |
Lubricate blower
bearings |
| Motor overloaded |
Correct but do not exceed motor
nameplate amps |
| Incorrect sheave
adjustment |
Serviceman should
correct |
| Pulleys misaligned |
Check and correct alignment |
| |
|
|
| Symptom
|
Possible
Causes |
Remedy |
| Water draining from overflow
standpipe |
Float arm improperly adjusted
|
Adjust float |
| Seal in float
valve leaking |
Replace float
valve |
| Standpipe not tight |
Tighten standpipe |
| |
|
|
| Symptom
|
Possible
Causes |
Remedy |
| Knocking or banging sound |
Bearings dry |
Lubricate blower bearings or
replace if badly worn. |
| Wheel rubbing
blower housing |
Inspect blower
shaft, collars, belt and or rotating off-balance pulley alignment
and motor mounting |
| Loose parts |
Resecure or reconnect |
| |
|
|
| Symptom
|
Possible
Causes |
Remedy |
| Blower shakes or rattles |
Belt or pulley loose |
Inspect and adjust, or replace
belt and/or pulley as needed. |
| |
|
|
| Symptom
|
Possible
Causes |
Remedy |
| Excessive humidity in building |
Inadequate exhaust |
Open doors or windows to increase
ventilation |
| |
|
|
| Symptom
|
Possible
Causes |
Remedy |
| Musty or unpleasant odor |
Stale or stagnant water in reservoir
|
Drain, flush and clean reservoir,
install bleed-off kit |
| Pads mildewed
or clogged |
Check Bleed-off
setting, Replace pads |
| Pads not completely wet before
cooler is turned on |
Turn on water before starting
unit cooler is turned on |
| |
|
|
