122 RT-SVX34C-EN
Maintenance
• 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 Table 31. If operating
pressures indicate a refrigerant shortage, measure the system superheat and system subcooling.
For guidelines, refer to "Charging by Subcooling".
Note: 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!
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.
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. These bearing are
considered permanently lubricated for normal operation. For severe dirty applications, if
relubrication becomes necessary, use a lithium based grease. See Table 69, p. 123 for
recommended greases.
Note: The bearings are manufactured using a special synthetic lithium based grease designed for
long life and minimum relube 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.
• 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.
• YC* units only - Check the heat exchanger(s) for any corrosion, cracks, or holes.
• Check the combustion air blower for dirt. Clean as necessary.
WARNING
Hazardous Gases and Flammable Vapors!
Exposure to hazardous gases from fuel substances have been shown to cause cancer, birth
defects or other reproductive harm. Improper installation, adjustment, alteration, service or use
of this product could cause flammable mixtures. To avoid hazardous gases and flammable
vapors follow proper installation and set up of this product and all warnings as provided in this
manual. Failure to follow all instructions could result in death or serious injury.
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