186 RT-SVX36G-EN
Maintenance
• 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 to the
bearings and fan wheels. Make sure that all bearing supports are tight.
• Check the supply fan belt(s). If the belts are frayed or worn, replace them. Refer to the “Fan Belt
Adjustment” section for belt replacement and adjustments.
• Check the condition of the gasket around the control panel doors. These gaskets must fit
correctly and be in good condition to prevent water leakage.
• Verify that all wire terminal connections are tight.
• Remove any corrosion present on the exterior surfaces of the unit and repaint these areas.
• Generally inspect the unit for unusual conditions (e.g., loose access panels, leaking piping
connections, etc.)
• 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:
– 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 Tab l e 7 1, p . 19 3 . If
the operating pressures indicate a refrigerant shortage, measure the system superheat and
system subcooling. For guidelines, refer to “Charging by Subcooling”.
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
Before completing the following checks, turn the unit OFF and lock the main power disconnect
switch open.
• Inspect the unit’s air filters. If necessary, clean or replace them.
• Check supply fan motor bearings; repair or replace the motor as necessary.
• Lubricate the supply fan shaft bearings with a lithium based grease. Refer to Table 63, p. 176
for recommended greases.
Note: The bearings are manufactured using a special synthetic lithium based grease designed for
long life and minimum lube intervals. Too much lubrication in a bearing can be just as
harmful as not enough.
• Use a hand grease gun to lubricate the 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.
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.
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