Johnson Controls YVAHP0721CW Series, Service Manual

Page: 394 / 416

6-4
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FIELD WORK INSTRUCTIONS
6.3 Maintenance Work
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(a) Fan and Fan Motor
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lubricating maintenance is required.
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Sound and Vibration - Inspect for abnormal sounds or vibration.
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Rotation - Check that the fan rotates counterclockwise and inspect the rotating speed.
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Insulation - Inspect for electrical insulation resistance.
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an outdoor unit, other obstacles such as growing grass and pieces of paper, which might intercept
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(c) Piping Connection
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Leakage - Inspect for refrigerant leakage at piping connections.
(d) Cabinet
• Stain and Lubricant - Inspect for any stain or lubricant and remove it, if any.
• Securing Screw - Inspect for loose or missing screws and secure or replace as required.
• Insulation - Inspect for peeling thermal insulation material on the cabinet and repair it, if any.
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circuit board (PCB).
• Line Condition - Pay attention to working voltage, amperage and phase balance.
Inspect for faulty contact caused by loosened terminal connections, oxidized contacts, foreign
matter, and other items. Inspect for electrical insulation resistance.
(f) Control and Protective Devices
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(a) Compressor
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Sound and Vibration - Inspect for abnormal sounds or vibration.
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(b) Reversing Valve
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(c) Strainer
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Clogging - Check that there is no temperature difference between the ends.
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for preheating of the compressor oil.
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Cleaning - Inspect for, and remove, any accumulated dirt and dust and remove according to the
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(b) Drain Pan, Condensate Mechanism and Condensate Pipe
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Drain Line - Inspect and clean the condensate line at least twice a year.
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Drain-Up Mechanism - Inspect for activation of drain-up mechanism.
(c) Float Switch
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