78
RT-SVX34V-EN
☐ Make sure that all retaining screws are reinstalled in the
unit access panels once these checks are complete.
☐ With the unit running, check and record the following:
– ambient temperature
– compressor oil level (each circuit)
– compressor suction and discharge pressures (each
circuit)
– superheat and subcooling (each circuit)
Record this data on an “operator’s maintenance log” like
the one shown in . If the operating pressures indicate a
refrigerant shortage, measure the system superheat and
system subcooling. For guidelines, refer to “Charging by
Subcooling,” p. 70.
Important: Do not release refrigerant to the atmosphere! If
adding or removing refrigerant is required, the
service technician must comply with all
federal, state and local laws. Refer to general
service bulletin MSCU-SB-1 (latest edition).
Heating Season
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
Before completing the following checks, turn the unit OFF
and lock the main power disconnect switch open.
☐ Inspect the unit air filters. If necessary, clean or replace
them.
☐ Check supply fan motor bearings; repair or replace the
motor as necessary.
☐ Check the fan shaft bearings for wear. Replace the
bearings as necessary.
Note: These bearing are considered permanently
lubricated for normal operation. For severe dirty
applications, if relubrication becomes necessary,
use a lithium based grease. See Table 36, p. 78
for recommended greases.
Important: The bearings are manufactured using a
special synthetic lithium-based grease
designed for long life and minimum relube
intervals. Over lubrication can be just as
harmful as not enough.
☐ Use a hand grease gun to lubricate these bearings; add
grease until a light bead appears all around the seal.
Do not over lubricate!
☐ After greasing the bearings, check the setscrews to
ensure that the shaft is held securely. Make sure that all
bearing braces are tight.
☐ 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.
☐ Gas units only - Check the heat exchanger(s) for any
corrosion, cracks, or holes.
☐ Check the combustion air blower for dirt or blockage
from animals or insects. Clean as necessary.
Note: The furnace will either have to be pulled out of
the unit for cleaning or open the panel on right-
hand side of unit to clean from the back. New
furnaces cannot be cleaned in the same way as
the drum and tube heat exchangers.
☐ Open the main gas valve and apply power to the unit
heating section; then initiate a “Heat” test using the
startup procedure described in “Gas Heat Units,” p. 70.
WARNING
Hazardous Gases and Flammable
Vapors!
Failure to observe the following instructions could
result in exposure to hazardous gases, fuel
substances, or substances from incomplete
combustion, which could result in death or
serious injury. The state of California has
determined that these substances may cause
cancer, birth defects, or other reproductive harm.
Improper installation, adjustment, alteration,
service or use of this product could cause
flammable mixtures or lead to excessive carbon
monoxide. To avoid hazardous gases and
flammable vapors follow proper installation and
setup of this product and all warnings as provided
in this manual.
☐ Verify that the ignition system operates properly.
Table 36. Grease recommendations
Recommended Grease
Recommended Operating Range
Exxon Unirex #2
Mobil 532 -20 F to 250 F
Mobil SHC #220
Texaco Premium RB
Coil Cleaning
Regular coil maintenance, including annual cleaning
enhances the unit’s operating efficiency by minimizing the
following:
• Compressor head pressure and amperage draw
• Water carryover
Maintenance
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