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2-3. Tools
2-3-1. Necessary tools
In Air to Water Heat Pump using R410A, the service port diameter of packed valve of the outdoor unit is changed
to prevent mixing of other refrigerant. To reinforce the pressure resistance, flare dimensions and opposite side
dimensions of flare nut (For Ø 12.7 copper pipe) of the refrigerant piping are lengthened.
Because the refrigerating machine oil is changed, mixing of oil may generate sludge, clog capillary, or cause other
problems. Accordingly, the tools to be used include:
• tools dedicated for R410A (Those that cannot be used for the conventional refrigerant, R22)
• tools dedicated for R410A, but can be also used for the conventional refrigerant, R22
• tools that can be used for the conventional refrigerant, R22.
The following table shows the tools dedicated for R410A and their interchangeability.
Tools dedicated for R410A (The following tools must be for R410A)
Tools whose specifications are changed for R410A and their interchangeability
* (Note 1) Flaring for R410A by using the conventional flare tool requires projection margin adjustment. This
adjustment requires copper pipe gauge or other instrument.
* (Note 2) A charging cylinder for R410A is currently under development.
General tools (Conventional tools are available)
In addition to the above dedicated tools, the following equipment also available for R22 is necessary as the general
tools.
Also prepare the following equipment for other work methods or run check.
No. Tool to be used Usage
R410A Air to Water Hear Pump
installation
Conventional refrigerant
Air to Water Heat Pump
installation
For R410A
Existence of new
equipment
Conventional
equipment can be
used
New equipment can be
used with conventional
refrigerant
1 Flare tool Pipe flaring Yes *(Note 1) Yes
2
Copper pipe gauge for
adjusting projection margin
Flaring by conventional
flare tool
Yes *(Note 1) *(Note 1)
3 Torque wrench (For Ø15.9) Connection of flare nut Yes No No
4 Gauge manifold
Evacuating, refrigerant
charge, run check, etc.
Yes No No
5 Charge hose
6 Vacuum pump adapter Vacuum evacuating Yes No Yes
7
Electrical balance for
refrigerant charging
Refrigerant charge Yes No Yes
8 Refrigerant cylinder Refrigerant charge Yes No No
9 Leakage detector Gas leakage check Yes No Yes
10 Charging cylinder Refrigerant charge *(Note 2) No No
1. Vacuum pump
Use this by attaching vacuum pump
adapter.
4. Reamer 9. Hole core drill (Ø65)
5. Pipe bender 10. Hexagon wrench
(Opposite side 4mm)6. Level vial
2. Torque wrench (For Ø6.35) 7. Screwdriver (+, –) 11. Tape measure
3. Pipe cutter 8. Spanner or Monkey wrench 12. Metal saw
1. Clamp meter 3. Insulation resistance meter
2. Thermometer 4. Electroscope
+00A09-002_01EN_SVM_ALL_Air_to_Water.book Page 10 Monday, October 5, 2009 2:09 PM