Necessary Tools And Materials - Mitsubishi Electric QAHV-N560YA-HPB Service Handbook

[ I Read Before Servicing ]

[2] Necessary Tools and Materials

Prepare the following tools and materials necessary for servicing the unit.
Replacement procedures for refrigerant circuit components
Preparation
1. Tools required
(1) Special tools for use with CO
1) Manifold: Withstand pressure of 21 MPa (Maximum unit pressure: 14 MPa)
2) Refrigerant charging hose (Withstand pressure: maximum unit pressure of 14 MPa); Unit connection: Swagelok (7/16-20UNF)
3) Pipe cutter: One capable of thick-wall pipe
4) CO refrigerant (Two 7 Kg cylinders)
2
5) Mouthpiece for CO refrigerant
2
(2) Other tools
1) Welder (Welder nozzle #250 or greater)
2) Packless valve: for checking the degree of vacuum
3) VaVacuum pump (with a check valve or an adapter) cuuming hose (for R404A/R407C); Unit connection: Swagelok (7/16-
20UNF)
4) Vacuum pump (with a check valve or an adapter)
5) Nitrogen (pressure reductin valve): for gas leak check, for non-oxidizing welding → Pressure reduction valve that can be ad-
justed to the pressure of 8.5 MPa
6) Scale: for controlling refrigerant charge
7) General tools for replacing parts (screwdriver, etc.)
8) Gas leak test liquid (foam test)
2. Replacement workflow
HWE1517A
refrigerant
2
- 4 -
GB