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Maintenance
12 Maintenance
WARNING: ELECTRICAL SHOCK HAZARD .
Ensure the power to the unit is shut off before
cleaning or servicing the unit. Failure to obey this
warning could result in death or serious injury.
WARNING: CORROSIVE CHEMICALS .
Avoid spilling or splashing the cleaning solution.
Follow all warnings and recommendations given
by the manufacturer of any cleaners or premixed
solutions.
These items should be part of a routine maintenance
program until a specific schedule for each can be
identified for this installation.
Monthly
Task
Clean or replace the return-air filter.
Check the condensate drain for blockages.
Check for any obstructions in the system.
Annually
Task
Clean and inspect the condenser coils.
Visually inspect the connecting lines and coils for signs of oil
leakage.
Check the wiring for loose or broken connections.
Check the evaporator coils. Clean using appropriate indoor
coil cleaner if necessary.
12 .1 Checking the Condensate
Drains
Check the Condensate Drain for obstructions every
three months. Check for obstructions by rapidly pouring
a quart of water into the Condensate Pan. If the water
does not completely drain within 30 seconds, check the
drain outlet for clogs.
30
12 .2 Cleaning the Return-Air Filter
Check the Return-Air Filter once a month (or more often if
local conditions and usage patterns dictate) and replace
or clean as necessary. To clean the filter:
• Remove the filter from the unit.
• Rinse the filter with water.
• Let the filter air dry.
• Install the filter back into the unit.
I
The filters in this unit may need to be checked more
often depending on the operating conditions and
the usage patterns.
12 .3 Refrigerant Gas
The refrigerant gas used in the air conditioning system is
adequate for the life of the system. Routine charging of
the system is not necessary.
12 .4 Checking the Condenser Coil
A dirty condenser coil reduces the unit's efficiency. A
reduction of efficiency will raise the total system pressure
and decrease the unit's ability to produce cold air. The
condenser coil can be flushed using low-pressure water
hose if necessary. Use appropriate outside coil cleaner if
cleaning the coil using coil cleaner.
With the system turned off at the circuit breaker on the
panel:
• Check and clean the condenser coil with coil cleaner.
• Rinse the coil to flush any residual cleaner from the
system.
• Restart the system and check operation parameters
after a thorough cleaning has taken place.
Additional cleaning may be necessary with extreme
contamination.
For the purpose of protecting the environment,
I
dispose of any contaminated cleaning solutions
in accordance with federal, state, and/or local
regulations.
Universal Air Conditioning Unit
EN
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Troubleshooting
