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 R
32
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 R
32
(Those which cannot be used for conventional refrigerant (R22))
2.
Tools exclusive for R
32
, but can be also used for conventional refrigerant (R22)
3.
Tools commonly used for R
32
and for conventional refrigerant (R22)
The table below shows the tools exclusive for R
32
and their interchangeability.
Tools exclusive for R
32
(The following tools for
R410A
are required.)
Tools whose specifications are changed for R
32
and their interchangeability
No.
1
2
3
4
5
6
7
8
Used tool
Flare tool
Copper pipe gauge for
adjusting projection
margin
Torque wrench
(For Ø12.7)
Gauge manifold
Charge hose
Vacuum pump adapter
Electronic balance for
refrigerant charging
Leakage detector
Usage
Pipe flaring
Flaring by
conventional flare tool
Connection of flare nut
Evacuating, refrigerant
charge, run check, etc.
Vacuum evacuating
Refrigerant charge
Gas leakage check
R
32(R410A)
air-water heat pump installation
Existence of
new equipment
for R
32
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Whether conven-
tional equipment
can be used
*
(Note 1)
*
(Note 1)
×
×
×
×
×
Conventional air-water
heat pump installation
Whether new equipment
can be used with
conventional refrigerant
¡
*
(Note 1)
×
×
¡
¡
¡
(Note 1)
When flaring is carried out for R
32(R410A)
using the conventional flare tools, adjustment of projection
margin is necessary. For this adjustment, a copper pipe gauge, etc. are necessary.
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
General tools (Conventional tools can be used.)
FILE NO. SVM-19040
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