Commercial Air Conditioner
Model: heat pump, 10SEER UNITS
34
………….Correct control voltage
………….Proper disconnect switches and breakers for indoor and outdoor units
………….Correct wire sides for both indoor and outdoor units.
OUTDOOR UNIT INSTALLATION
………….Unit level with proper clearances for air flow and service
…………..Proper elevation of outdoor unit
…………..Solid pad
………….Coil free from dirt and debris
………….Unit charged according to manufacturer’s instructions
…………. Any evidence of refrigerant leaks
REFRIGERANT LINES
………….Proper length according to manufacturer’s instructions
…………..Proper size according to manufacturer’s instructions
…………..Large vapor line insulated
………….No inadvertent oil traps
………….No kinks or restrictions
…………. Any evidence of refrigerant leaks
INDOOR UNIT INSTALLATION
………….Adequate clearances for air flow and service
…………..Adequate supply and return air ducting
…………..Air ducts sealed to prevent leakage
………….Correct filter(s)
………….External static pressure_____ inches W.C.
…………. Proper air flow (about 400 CFM per ton)
………….Correct indoor coil and accessories
…………. Any evidence of refrigerant leaks
…………. Condensate line piped with trap and vent
………….Horizontal drain pan installed in horizontal applications
…………. Auxiliary drain pan installed in horizontal applications
…………. Auxiliary condensate line installed in horizontal application
CAPACITOR ELECTRICAL CHECK
WARNING :ANY CAPACITOR SHOWING SIGNS OF LEAKS OR BUDGING MUST BE REPLACED
IMMEDIATEDLY. DO NOT OPERATE THE COMPRESSOR WITH A CAPACITOR SHOWING THESE
SIGNS.
Single phase compressors require a run capacitor connected to the run and start windings .This puts the
two windings out of phase from one another and allows the compressor motor to start. Use a capacitor
analyzer to determine if the capacitor dielectric is becoming weak, or if the MFD value has changed .If a
capacitor analyzer is not available ,use a quality ohmmeter to check the resistance between the
capacitor plates
1. Set the ohmmeter to the highest scale available
2. Discharge the capacitor by shorting the terminals with the blade of a screwdriver having an insulated
handle.
3. Place the Ohmmeter probes on the capacitor terminals and read:
A. The meter pointer moves towards zero, then gradually moves to higher ohm values ,the
capacitor is GOOD
B. The meter pointer does not move. An Open capacitor- REPLACE.
C. The meter pointer goes toward ZERO ohms and stays A shorted capacitor –replace.
4. Replace any failed capacitor with a capacitor having the same MFD and voltage rating.
COMPRESSOR START KITS
