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SXIH-SVX01B-EN 23
Maintenance
maintenance
procedures
Maintenance Procedures
Before beginning any maintenance
procedures heed all warnings and
cautions.
WARNING
Hazardous voltage!
Disconnect all electric power,
including remote disconnects before
servicing. Follow proper lockout/
tagout procedures to ensure the
power can not be inadvertently
energized. Failure to disconnect
power before servicing could result in
death or serious injury.
Periodic Maintenance Checklist
Inspect coil surface for cleanliness.
Clean as required. Refer to “Coil
Cleaning” under “Maintenance
Procedures.”
Annual Maintenance Checklist
Perform all monthly maintenance
inspections.
Perform seasonal startup checks.
Leak test refrigerant circuits. Inspect
contacts of fan motor contactors and
relays. Replace all worn contacts.
Clean condenser fans.
Clean and repaint any corroded
surface.
Periodic Maintenance Procedures
This section describes specific
maintenance procedures that must be
preformed as a part of the normal
maintenance program for this unit. Be
certain to disconnect electrical power to
the unit before performing these
procedures.
Note: the following coil cleaning proce-
dures apply only to the outdoor condens-
ers. Do not use these procedures for the
reheat or evaporator coils.
Cleaning the Condenser Coils
Clean the coil at least once each year or
more frequently if located in a dirty
environment, to help maintain proper unit
operating efficiency. High discharge
pressures are a good indication that the
coil needs cleaning. Follow the detergent
manufacturer instructions as closely as
possible to avoid potential damage to the
coil.
WARNING
Hazardous chemicals!
Coil cleaning agents can be either
acidic or highly alkaline. Handle
chemicals carefully. Proper handling
should include goggles or face shield,
chemical resistant gloves, boots,
apron or suit as required. For personal
safety refer to the cleaning agent
manufacturer’s Materials Safety Data
Sheet and follow all recommended
safe handling practices. Failure to
follow all safety instructions could
result in death or serious injury.
To clean the refrigerant coil, use a soft
brush and sprayer, such as a garden
pump up or high pressure type . In
addition, use a quality detergent; like
“SPREX AC’, “ OAKITE 161” or “OAKITE
166” and “COILOX.”
Note: If detergent is strongly alkaline (i.e.
has a pH value greater that 8.5 ) after
mixing, an aluminum corrosion inhibitor
must be added.
Coil Cleaning Procedure
WARNING
Hazardous voltage!
Disconnect all electric power,
including remote disconnects before
servicing. Follow proper lockout/
tagout procedures to ensure the
power can not be inadvertently
energized. Failure to disconnect
power before servicing could result in
death or serious injury.
1. Disconnect power to the unit.
2. Remove panels from the unit to gain
access to the coil.
3. Use a soft brush to remove loose dirt
and debris form both sides of the coil.
4. Straighten coil fins with fin comb as
required.
5. Mix the detergent with water according
to the manufacturers instructions.
Observe all recommendations of the
cleanser manufacturer. The coil cleanser
manufacturer’s recommendations,
warnings and cautions will at all times
take precedence to these instructions.
1. Place solution in the sprayer. Be sure to
follow these guidelines if using a high-
pressure sprayer:
a) Minimum nozzle spray angle is 15°.
b) Spray solution at a 90° angle to the coil
face.
c) Keep sprayer nozzle at least six inches
form the coil.
d) Sprayer pressure must not exceed
600 psi.
2. Spray leaving air side of the coil first
then spray the entering air side of the
coil. Allow the detergent and water
solution to stand on the coil for five
minutes.
3. Rinse both sides of the coil with cool,
clean water.
4. Inspect the coil. If it still appears dirty,
repeat the cleaning procedure.
5. Reinstall all unit components and
panels, and restore electrical power
and gas supply to the unit.