Service manual

9-7. Charging additional refrigerant

9-7-1.When tubes are extended

• Observe the proper amount of refrigerant as stated in this service manual or the installation manual that came

with the indoor unit.

Charge additional refrigerant in liquid state.

●

Never charge additional refrigerant if refrigerant is leaking from the unit. Follow

instructions given in "10-6. In case refrigerant is leaking" and completely carry out

repairs. Only then should you recharge the refrigerant.

9-8. Retro-fitting existing systems

9-8-1 Use of existing units

•

Never use new refrigerant R407C for existing units which use R22.

This will cause the air conditioner to

operate improperly and may result in a hazardous condition.

9-8-2 Use of existing tubing

• If replacing an older unit that used refrigerant R22 with a R407C unit,

do not use its existing tubing

. Instead,

completely new tubing must be used.

CAUTION