Trane Custom Climate Changer Air Handlers, CAH-SVX01A-EN manual Alignment section on

Troubleshooting

Table 5. Air handler troubleshooting recommendations

Symptom	Probable Cause	Recommended Action
Short 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	Improper belt tension. Adjust tension.
	Belts rubbing	Remove obstruction or realign drive for clearance.
Bearing noise	Poor alignment	Loosen bearing set screws and realign (see the “Bearing Set Screw
		Alignment” section on page 50).
	Failed bearing	Replace bearing.
	Inadequate lubrication	Replace bearing.
Low water coil	Incorrect airflow	Check fan operating condition.
capacity	Incorrect water flow	Inspect the water pumps and valves for proper operation and check
		the lines for obstructions.
	Incorrect water temperature	Adjust the chiller or boiler to provide the proper water
		temperature.
	Coil is piped incorrectly	Verify coil piping (see the “Coil Piping and Connections” section on
		page 28.
	Dirty fin surface	Clean the fin surface (see the “Coils” section on page 52).
	Incorrect glycol mixture	Verify glycol mixture and adjust if necessary.
Low refrigerant coil	Incorrect airflow	Check fan operating condition.
capacity	Expansion valve is not operating properly or is	Check sensing bulb temperature.
	sized incorrectly	Verify valve operation.
		Verify proper valve size.
	Incorrect refrigerant charge	Verify refrigerant charge and adjust if necessary.
	Condensing unit failure	Verify condensing unit operation.
	Coil is piped incorrectly	Verify coil piping (see the “Coil Piping and Connections” section on
		page 28).
	Clogged refrigerant line filter	Change filter core.
	Failure of suction/liquid line components	Verify component operation
	Dirty fin surface	Clean the fin surface (see the “Coils” section on page 52).
		Note: Do not use steam to clean refrigerant coils.
	Fin frosting	Verify defrost cycle operation.
		Verify frostat operation.
		Verify refrigerant charge.
Low steam coil	Incorrect airflow	Check fan operating condition.
capacity	Coil is piped incorrectly	Verify coil piping (see the “Coil Piping and Connections” section on
		page 28).
	Incorrect steam pressure	Verify steam pressure and adjust if necessary.
	Excessive steam superheat	Check steam superheat.
		Steam superheat should not exceed 50ºF.
	Failure of steam line/condensate return	Verify component operation
	components
	Boiler failure	Verify boiler operation
	Dirty fin surface	Clean the fin surface (see the “Coils” section on page 52).
Drain pan is	Plugged Drain Line	Clean drain line
overflowing	Unit not level	Level unit
	Improper trap design	Design trap per unit installation instructions
Standing water in	Improper trap design	Design trap per unit installation instructions
drain pan	Unit not level	Level unit
	Plugged Drain Line	Clean drain line
Wet interior	Coil face velocity too high	Reduce fan speed
insulation	Improper trap design	Design trap per unit installation instructions
	Drain pan leaks/overflows	Repair leaks
	Condensation on surfaces	Insulate surfaces
Excess dirt in unit	Missing filters	Replace filters
	Filter bypass	Reduce filter bypass by ensuring all blockoffs are in place.
Microbial growth	Standing water in drain pan	See “Standing water in drain pan”

(mold) inside air handler

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