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Installation and Maintenance 67
Motor runs and then dies down
Partial loss of line voltage Check for loose connections.
Determine adequacy of main power
supply.
Stator shorts when motor warms up Replace stator.
Motor does not come up to
speed
Low voltage at motor terminals Check voltage across AC line and
correct voltage loss if possible.
Line wiring to motor too small Replace with larger sized wiring.
Motor overheats
Overloaded motor Reduce load or replace with a larger
motor.
Motor fan is clogged with dirt
preventing proper ventilation
Remove fan cover, clean fan and
replace cover.
Excessive motor noise
Motor mounting bolts loose Tighten motor mounting bolts.
Rigid coupling connections Replace with flexible connections.
Worn motor bearings Replace bearings and seals.
Fan rubbing on fan cover Remove interference in motor fan
housing.
Rapid motor bearing wear
Excessive overhung load due to
overtensioned drive
Check belt tension and overhung load.
Excessive overhung load due to a
small diameter motor sheave
Replace sheave with larger one.
Loose fan belt
Motor is poorly positioned Adjust belt tension.
Worn or damaged belt Replace belt or belt set. Check sheave
alignment.
Worn sheaves Replace sheaves.
Shorter belt life
Worn sheaves Replace sheaves.
Misaligned belt Realign drive with MVP sheave set at
mean pitch diameter.
Grease or oil on belts Check for leaky bearings. Clean belts
and sheaves.
Belt slipping Adjust tension.
Belts rubbing Remove obstruction or realign drive
for clearance.
Bearing noise
Poor alignment Loosen bearing set screws and realign
(See Figure 50 .)
Inadequate lubrication Grease bearing(s).
Low coil capacity
(Chilled water)
Air is bypassing coil Prevent bypass with block-offs.
Coil tubes are blocked Clean and unblock tubes.
Incorrect airflow Check fan operating conditions.
Incorrect gpm Check water pumps, valves and lines
for obstructions.
Incorrect water temperature Provide proper water temperature.
Low coil capacity (Refrigerant)
Air is bypassing coil Prevent bypass with block-offs.
Coil tubes are blocked Clean and unblock tubes.
Incorrect airflow Check fan operating conditions.
Expansion valve not operating Check sensing bulb location and TXV
operation.
Table 52
T-Series Climate Changer Trouble Analysis
SYMPTOM PROBABLE CAUSE RECOMMENDED ACTION