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11-4. Charging Additional Refrigerant
11-4-1. When Tubes are Extended
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Observe the proper amount of refrigerant as stated in the installation manual that came with the indoor unit. Charge
additional refrigerant in liquid state only.
11-5. Retro-Fitting Existing Systems
11-5-1. Use of Existing Units
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Never use new refrigerant R410A for existing units which use R22. This will cause the air conditioner to operate
improperly and may result in a hazardous condition.
11-5-2. Use of Existing Tubing
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If replacing an older unit that used refrigerant R22 with a R410A unit, do not use its existing tubing. Instead, com-
pletely new tubing must be used.
CAUTION
Never charge additional refrigerant if refrigerant is leaking from the unit.