Toshiba RAS-B10GKVP-E Service Manual page 16

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
1 Flare tool
Copper pipe gauge for
2
adjusting projection margin
Torque wrench
3
(For Ø12.7)
4 Gauge manifold
5 Charge hose
6 Vacuum pump adapter
Electronic balance for
7
refrigerant charging
8 Refrigerant cylinder
9 Leakage detector
10 Charging cylinder
(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.
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
5. Pipe bender
7. Screwdriver (+, –)
Also prepare the following equipments for other installation method and run check.
1. Clamp meter
2. Thermometer
Usage
Pipe flaring
Flaring by
conventional flare tool
Connection of flare nut
Evacuating, refrigerant
charge, run check, etc.
Vacuum evacuating
Refrigerant charge
Refrigerant charge
Gas leakage check
Refrigerant charge
General tools (Conventional tools can be used.)
4. Reamer
6. Level vial
3. Insulation resistance tester
4. Electroscope
R410A
air-water heat pump installation
Existence of
Whether conventional
new equipment
equipment can be used
for R410A
Yes ∗(Note 1)
Yes ∗(Note 1)
×
Yes
×
Yes
×
Yes
×
Yes
×
Yes
×
Yes
×
(Note 2)
8. Spanner or Monkey wrench
9. Hole core drill (Ø65)
10. Hexagon wrench (Opposite side 4mm)
11. Tape measure
12. Metal saw
– 16 –
Conventional air-water
heat pump installation
Whether new equipment
can be used with
conventional refrigerant
¡
∗(Note 1)
×
×
¡
¡
×
¡
×