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12-3. Tools Specifically for R410A
●
For servicing, use the following tools for R410A
●
To prevent other refrigerants (R22, R407C) from being mistakenly charged to this unit, sizes of the service
ports and flare nuts of the narrow tube service valve and wide tube service valve have been altered.
12-4. Tubing Installation Procedures
When the tubes are connected,
always apply HAB oil on the flare portions to improve the sealing of tubing.
The following is the HAB oil generally used:
Esso: ZERICE S32
For details on tubing installation procedures, refer to the installation manuals attached to the
indoor unit and outdoor unit.
NOTE
Tool Distinction Tool Name
● Gauge manifold
● Charging hose
● Gas leak detector
● Refrigerant cylinder
● Charging cylinder
● Refrigerant recovery unit
● Vacuum pump with anti-reverse flow (*1)
(Solenoid valve-installed type, which prevents oil from flowing back into the
unit when the power is off, is recommended.)
● Vacuum pump (*2) … can be used if the following adapter is attached.
● Vacuum pump adapter (reverse-flow prevention adapter) (*3).
(Solenoid valve-installed adapter attached to a conventional vacuum pump.)
● Electronic scale for charging refrigerant
● Flare tool
● Bender
● Torque wrench
● Cutter, reamer
● Welding machine, nitrogen gas cylinder
Tools specifically for R410A
Tools which can be com-
monly used for R22,
R407C, and R410A
CAUTION
●
The above tools specifically for R410A must not be used for R22 and R407C.
Doing so will cause malfunction of the unit.
●
For the above vacuum pump (
*
1,
*
2) and vacuum pump adapter (
*
3), those for
R22-type units can be used for R407C-type. However, they must be used exclu-
sively for R410A and never alternately with R22 and R407C.