72
RT-SVX092A-EN
☐ Check supply fan motor bearings and repair or replace
the motor as necessary.
☐ Inspect both the main unit control panel and heat
section control box for loose electrical components and
terminal connections, as well as damaged wire
insulation. Make any necessary repairs.
☐ Verify the heating systems operate properly.
Coil Cleaning
Regular coil maintenance, including annual cleaning,
enhances the unit’s operating efficiency by minimizing the
following:
• Compressor head pressure and amperage draw
• Evaporator water carryover
• Fan brake horsepower due to increased static pressure
losses
• Airflow reduction
WARNING
Hazardous Chemicals!
Failure to follow this safety precaution could result in
death or serious injury. Coil cleaning agents can be
either acidic or highly alkaline and can burn severely
if contact with skin or eyes occurs.
Handle chemical carefully and avoid contact with
skin. ALWAYS wear Personal Protective Equipment
(PPE) including 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.
At least once each year, or more often if the unit is located
in a dirty environment, clean the condenser coils using the
instructions below. Follow these instructions as closely as
possible to avoid damaging the coils.
Note: For units equipped with hail guards follow removal
procedure listed below.
Hail Guard Removal
1. Remove shipping screws (ones without washers).
2. Lift hail guards up so screws with washers go to bottom
of keyhole.
3. Remove hailguard by sliding washer head screw
through keyhole.
Microchannel (MCHE) Coils
NOTICE
Coil Damage!
Failure to follow instructions below could result in
coil damage.
DO NOT use any detergents with microchannel
condenser coils.
Use pressurized water or air ONLY, with pressure no
greater than 600psi.
For additional information regarding the proper
microchannel coil cleaning procedure, refer to RT-
SVB83*-EN
• Due to the soft material and thin walls of the MCHE
coils, the traditional field maintenance method
recommended for Round Tube Plate Fin (RTPF) coils
does not apply to microchannel coils.
• Chemical cleaners are a risk factor to MCHE due to the
material of the coil.
• The manufacturer does not recommend the use of
chemical cleaners to clean microchannel coils. Using
chemical cleaners could lead to warranty claims being
further evaluated for validity and failure analysis.
The recommended cleaning method for microchannel
condenser coils is pressurized water or air with a non-
pinpoint nozzle and an ECU of at least 180 with pressure
no greater than 600 psi. To minimize the risk of coil
damage, approach the cleaning of the coil with the
pressure washer aimed perpendicular to the face of the coil
during cleaning.
Note: For more details on microchannel coil cleaning,
please refer to Unitary Light and Large Commercial
Unit Microchannel Coil Servicing Guidelines (RT-
SVB83*-EN).
Hail Guard Reinstallation
Reinstall hail guards by aligning the keyholes over the
washer screw heads, and slide into place. If the installation
requires seismic or special wind load compliance, reinstall
shipping screws.
Hot Gas Reheat Additional Oil
NOTICE
Compressor Damage!
Use of incorrect refrigerant and oil could result in
compressor damage and improper unit operation.
Use only refrigerant and oil specified on the unit
nameplate.
Additional refrigerant oil has been added in the factory for
all 6 to 25 ton hot gas reheat units. The 3 to 5 ton, standard
efficiency, hot gas reheat units do not have additional oil. If
major components (coil, valve assembly, or others.) are
replaced or serviced, the following steps must be taken.
1. Measure the amount of oil removed during servicing.
Maintenance
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