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6-3. Tools
6-3-1. Required tools
The service port diameter of packed valve of the outdoor unit in the air conditioner using R410A is changed to
prevent mixing of other refrigerant. To reinforce the pressure-resisting strength, flare processing dimensions and
opposite side dimension of flare nut (For ∅12.70 copper pipe) of the refrigerant piping are lengthened.
The used refrigerating oil is changed, and mixing of oil may cause a trouble such as generation of sludge,
clogging of capillary, etc. Accordingly, the tools to be used are classified into the following three types.
(1) Tools exclusive for R410A (Those which cannot be used for conventional refrigerant (R22))
(2) Tools exclusive for R410A, but can be also used for conventional refrigerant (R22)
(3) Tools commonly used for R410A and for conventional refrigerant (R22)
The table below shows the tools exclusive for R410A and their interchangeability.
Tools exclusive for R410A (The following tools for R410A are required.)
Tools whose specifications are changed for R410A and their interchangeability
R410A air conditioner Conventional air
installation conditioner installation
No. Used tool Usage Existence of Whether Whether new equipment
new equipment conventional can be used with
for R410A equipment can conventional refrigerant
be used
1 Flare tool Pipe flaring Yes *(Note 1)
2 Copper pipe gauge Flaring by
for adjusting projection conventional flare Yes *(Note 1) *(Note 1)
margin tool
3 Torque wrench
Connection of
Ye s
flare nut
4 Gauge manifold
5 Charge hose
6 Vacuum pump adapter Vacuum evacuating Yes
7
Electronic balance for
Refrigerant charge Yes
refrigerant charging
8 Refrigerant cylinder Refrigerant charge Yes
9 Leakage detector Gas leakage check Yes
! Charging cylinder Refrigerant charge (Note 2)
Evacuating,
refrigerant charge, Yes
run check, etc.
(Note 1) When flaring is carried out for R410A using the conventional flare tools, adjustment of projection
margin is necessary. For this adjustment, a copper pipe gauge, etc. are necessary.
(Note 2) Charging cylinder for R410A is being currently developed.
General tools (Conventional tools can be used.)
In addition to the above exclusive tools, the following equipments which serve also for R22 are necessary as
the general tools.
(1) Vacuum pump (4) Reamer (9) Hole core drill (∅65)
Use vacuum pump by (5) Pipe bender (10) Hexagon wrench
attaching vacuum pump adapter. (6) Level vial (Opposite side 4 mm)
(2) Torque wrench (7) Screwdriver (+, –) (11) Tape measure
(3) Pipe cutter (8) Spanner of Monkey wrench (12) Metal saw
Also prepare the following equipments for other installation method and run check.
(1) Clamp meter (3) Insulation resistance tester
(2) Thermometer (4) Electroscope