– 10 –
3-3. Tools
3-3-1. Required Tools
The service port diameter of packed valve of the outdoor unit in the air-water heat pump 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 Ø12.7 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
No.
Used tool
Usage
R410A
air-water heat pump installation
Conventional air-water
heat pump installation
Existence of
new equipment
for R410A
Whether conventional
equipment can be
used
Whether new equipment
can be used with
conventional refrigerant
1
Flare tool
Pipe flaring
Yes
*(Note 1)
O
2
Copper pipe gauge for
adjusting projection
margin
Flaring by
conventional flare tool
Yes
*(Note 1)
*(Note 1)
3
Torque wrench
(For Ø12.7)
Connection of flare nut
Yes
×
×
4
Gauge manifold
Evacuating, refrigerant
charge, run check, etc.
Yes
×
×
5
Charge hose
6
Vacuum pump adapter Vacuum evacuating
Yes
×
O
7
Electronic balance for
refrigerant charging
Refrigerant charge
Yes
×
O
8
Refrigerant cylinder
Refrigerant charge
Yes
×
×
9
Leakage detector
Gas leakage check
Yes
×
O
10
Charging cylinder
Refrigerant charge
(Note 2)
×
×
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
Use vacuum pump by attaching
vacuum pump adapter.
2. Torque wrench (For Ø6.35, Ø9.52)
3. Pipe cutter
4. Reamer
5. Pipe bender
6. Level vial
7. Screwdriver (+, –)
8. Spanner or Monkey wrench
9. Hole core drill (Ø65)
10. Hexagon wrench
(Opposite side 4mm)
11. Tape measure
12. Metal saw
Also prepare the following equipments for other installation method and run check.
1. Clamp meter
2. Thermometer
3. Insulation resistance tester
4. Electroscope
(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.
Summary of Contents for ras-m07g3dv-e
Page 86: ... 85 13 EXPLODED VIEWS AND PARTS LIST 13 1 Indoor Unit ...
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