Thermostat - Check
for loose connections that may cause unit short cycling. If possible,
check or calibrate temperature readings.
Compressor - Check
starting amp draw along with running amps. Compare to unit ratings.
Look for burnt wires at compressor terminal.
Split Temperature
- Measure temperature drop as air passes through evaporative coil.
Ideal temperature drop should be approximately 20 degrees.
Freon - Check system
pressures to ensure the proper charge on unit. If the system needs
more than 2 lbs. do not add freon until leak is found and repaired.
Air Filter - Replace
old air filter with a new filter. Look for any debris that could be
restricting airflow in return. Try to inspect the face of indoor coil.
Condenser Motor
- Check amp draw against max ratings. If needed, oil motor. Check
for loose bearings or damaged fan blade.
Air Distribution
- Ask customer how airflow is throughout the home. If airflow is restricted,
examine supply and return ductwork plus plenum.
Condenser Coil -
Check temperature split on coil. Should be approximately 30 degrees.
Ensure coil is clean of debris and fins are not damaged.
Air Ducts - Make
sure air ducts are clean and free of any growth. Look for signs that
may indicate leaks in ducts. (Cold air in attic or insulation In ducts)
Blower Motor - Check
amp draw against max ratings. If needed, oil motor. Check to insure
blower wheel is clean and free of bacteria build-up.
Disconnect Box -
Make sure all connections are tight. Look for signs of metal fatigue
or signs of overheating (Bluish-Green). Replace if Necessary.
Evaporative Coil
- Check and make sure both sides of coil are clean. Dirty coils cause
poor system performance and early breakdown. Also poor IAQ.
Fuses - Check on
fuse condition. If fuse is swollen or bad, check disconnect box for
loose connection or leaks that may be permitting water inside.
Condensate Drain
- Make sure drain is free of debris and bacteria growth. Check PVC
for lose or cracked parts. Look for overflow signs (Rust).
Contactors - Check
switch for worn or pitted points. Check part for possible discoloration
or burnt wires. Replace part if worn.
Plenum - Make sure
plenum (Elbow) is sealed correctly and that no air is escaping to
the outside. 8 out of 10 elbows leak, usually underneath.
Start Kit/Relays/Transformers
- Inspect all parts for loose wiring or worn out parts, and ensure
parts are securely mounted.
Insulation - Check
the insulation by blower to make sure it canŐt be sucked in. Also
check tubing on suction line. Worn Insulation effects system efficiency.
Run Capacitors -
Check microfarads on all caps. Recommend replacement if they are not
within 10%. Check for oil leaks or voltage drop. Replace if bad.
Safety Controls
- Check to make sure that the oil safety and high-pressure controls
are functioning properly. Be sure that no one has disconnected them.