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4 - Inspect the indoor coil drain pans and condensate
drains for rust, debris, obstructions, leaks or cracks.
Pour water in pans to conrm proper drainage from
the pan through to the outlet of the pipe. Clean or
replace as necessary.
5 - Inspect and clean indoor coil, if necessary.
6 - Inspect the condition of the refrigerant lines and
conrm that pipes are not rubbing copper-to-
copper. Also, ensure that refrigerant pipes are not
being a󰀨ected by indoor air contamination. Check
condition of insulation on the refrigerant lines.
Repair, correct, or replace as necessary.
7 - Inspect the duct system for leaks or other problems.
Repair or replace as necessary.
8 - Check for bearing/bushing wear on indoor blower
motor. Replace as necessary.
9 - If your heat pump is matched with a gas- or oil-red
furnace for auxiliary heating, indoor unit service
will also include inspection and cleaning of the
burners, and a full inspection of the gas valve, heat
exchanger and ue (exhaust) system.
General System Test with System Operating
1 - Your technician should perform a general system
test. He will turn on the air conditioner to check
operating functions such as the startup and shuto󰀨
operation. He will also check for unusual noises or
odors, and measure indoor/outdoor temperatures
and system pressures as needed. He will check
the refrigerant charge per the charging sticker
information on the outdoor unit.
2 - Verify that system total static pressure and airow
settings are within specic operating parameters.
3 - Verify correct temperature drop across indoor coil.
ML17XP1 Start-Up and Performance Checklist
Customer Address
Indoor Unit Model Serial
Outdoor Unit Model Serial
Notes:
START UP CHECKS
Refrigerant Type:
Rated Load Amps: Actual Amps Rated Volts
Actual Volts
Condenser Fan Full Load Amps Actual Amps:
COOLING MODE
Suction Pressure: Liquid Pressure:
Supply Air Temperature: Ambient Temperature: Return Air: Temperature:
System Refrigerant Charge (Refer to manufacturer's information on unit or installation instructions for required
subcooling and approach temperatures.)
Subcooling:
A — B = SUBCOOLING
Saturated Condensing Temperature (A)
minus Liquid Line Te mperature (B)
Approach:
A — B = APPROACH
Liquid Line Te mperature (A)
minus Outdoor Air Te mperature (B)
Indoor Coil Te mperature Drop (18 to 22°F)
A — B = COIL TEMP DROP
Return Air Te mperature (A)
minus Supply Air Temperature (B)