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13
MAINTENANCE
Cleaning of Return grille
Preparation :
1. Turn off the main power supply switch (or breaker) before the unit maintenance.
2. Dismount the Return grille.
Clean the Return grilles with water:
• Wipe down the Return grille with a sponge or towel moistened with a kitchen detergent.
(Do not use any metallic brush for cleaning.)
• Carefully rinse the Return grille to wash out the detergent.
• After rinsing the Return grille with water, dry it in the shade.
CAUTION
• Do not start the air conditioner while leaving the return grille removed.
Cleaning of Air Filters
• If the air filters are not cleared, it not only impairs the cooling performance of air conditioner but causes a failure in
the air conditioner such as water drops.
Preparation :
1. Turn off the main power supply switch (or breaker) before the unit maintenance.
2. Dismount the Return grille.
Use a vacuum cleaner to remove dust from the filters or wash them with water.
• After rinsing the air filters with water, dry them in the shade.
• Set the air filter into the air conditioner.
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INSTALLATION/SERVICING TOOLS
Tools
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: Newly prepared (They are special requirements for R407C, separate from those for R22.)
o : Existing tools are available.
For the details of the tools, refer to the Installation manual of the outdoor unit.
Tools
Gauge manifold
Charge hose
Electronic balance for
refrigerant charging
Torque wrench
(nominal diam.
1/4, 3/8, 1/2, 5/8)
Tools
Flare tool
(clutch type)
Gauge for projection
adjustment
Vacuum pump
adapter
Gas leak detector
Applicable to R22 model
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o
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o
Applicable to R22 model
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