MODEL PCA090480WH
CHAPTER 2
SERVICE
Section 9: Cleaning and Painting
March 2013
2-9
Proprietary/Confidential
Page
59
© 2013 Twist, Inc.
1. Filters
The air intake filters are constructed of aluminum mesh media and are the
washable viscous impingement type.
To clean the filters, remove each filter from the frame and clean with a vacuum
cleaner or immerse in a warm water and mild detergent mixture. Rinse the
filter with a hose and dry with an air hose or air-dry.
2. Condensers
When condensers become filled with dust or dirt between the fins, remove the
screen for access. First, remove excess dirt from condensers with soft-bristled
paintbrush. Second, use air or water to remove any loosened residue. Apply
water or airflow so that residue is directed away from the coil instead of into the
coil. In a severe environment, use a non-acid, alkaline based, coil-cleaning
solution as described below.
WARNING: WHEN USING AIR (NOT MORE THAN 30 PSIG) FOR
CLEANING, IT IS IMPORTANT TO FOLLOW NORMAL
SAFETY PROCEDURES. SERIOUS PERSONAL INJURY CAN
RESULT WITH MISDIRECTED PRESSURIZED AIR.
3.
Evaporators and Ducts
Clean the evaporator coil, plenums, air passages, and ducts using a non-acid,
alkaline based, coil cleaner such as Nu-brite Coil Cleaner. Mix the solution
with water as directed by the manufacturer. There are access panels on the
plenum to clean the evaporator coil. The other way is to clean it by blowing the
solution through the blower and through the coil. To do this, stretch the duct
out and secure the end to keep the duct from whipping. Start the unit in vent
mode by turning off the compressor and heater circuit breakers. Remove the
air filters, and using a fine liquid spray, spray the solution into the air inlet
opening. Continue to spray the solution into the opening until the foam leaves
the end of the hose. Continue for fifteen minutes or until no dirt comes out of
the unit. Spray clean water into the air opening to rinse the solution out of the
unit and duct. Continue to operate the unit for another fifteen minutes after the
water spray has stopped to dry the unit. Turn unit off and reset the circuit
breakers. Clean the air filters and re-install.
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