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Monobloc Outdoor Unit
2.
Refrigerant (R410A)
This Air to Water Heat Pump adopts a new refrigerant HFC (R410A) to prevent destruction of the ozone layer. The
working pressure of R410A refrigerant is 1.6 times higher than that of the conventional refrigerant R22.The refrigerant
oil is also changed for the new refrigeration. Therefore, during installation or service work, be sure that water, dust,
former refrigerant, or refrigeration machine oil does not enter the refrigerant cycle of the new type refrigerant Air to
Water Heat Pump. A wrong installation or service operation may cause a serious accident.
Read the following instructions carefully to ensure the correct tools and personnel are used for all tasks involving the
use of R410A refrigerant.
2.1.
Safety during installation & service
•
Use only the refrigerant R410A for Air to Water Heat Pump using R410A.
•
A mixture of R410A with different ones excessively raises the pressure in a refrigerant cycle, leading to an
injury due to burst failure.
•
Check the refrigerant name to use the tools and personnel appropriate for the refrigerant.
•
A product using the refrigerant R410A has the refrigerant name prominently displayed on its outdoor unit.
•
Ventilate if refrigerant gas leaks during service work.
•
Should refrigerant gas catch fire, poisonous gases may be produced. A closed room full of leaking
refrigerant results in the absence of oxygen; it is dangerous. Make sure to ventilate.
•
When the refrigerant cycle is refilled with refrigerant, do not mix air or refrigerants other than the specified
refrigerant, R410A.
•
A mixture of R410A with air or an inappropriate substance causes excessive high pressure inside the
refrigerant cycle, leading to possible injury due to burst failure.
•
Check that no refrigerant gas leaks after the service / repair work is completed.
•
When installing the unit that contains large amount of refrigerant such as Air to Water Heat Pump, take
measures to prevent the refrigerant from exceeding the threshold concentration in case it leaks.
•
Should leaking refrigerant exceed the threshold concentration an accident could be caused due to oxygen
deficient
•
When installing the unit or re-installing it after relocation, follow the installation guide to ensure correct
operation.
•
A defective installation may cause a refrigerant cycle defect, a water leak, an electric shock, or a fire.
•
Do not modify the product. Do not disassemble or modify the parts also. A fire, an electric shock, or an injury
may occur.
2.2.
Tools
The following tools must be on equipment using R410A refrigerant:
No.
Tool to be used
1
Gauge manifold
2
Charge hose
3
Vacuum pump adapter
Electrical balance for
4
refrigerant charging
5
Refrigerant cylinder
6
Leakage detector
General tools
In addition to the above dedicated tools, the following tools are required as general equipment:
1.
Vacuum pump: Use this by attaching vacuum pump adapter.
2.
Torque wrench
3.
Pipe cutter
4.
Reamer
5.
Pipe bender
6.
Spirit level
7.
Screwdriver (+, –)
8.
Spanner or Monkey wrench
9.
Hole core drill
10. Hexagon wrenches
11. Tape measure
12. Metal saw
Usage
Evacuating, refrigerant
charge, run check, etc.
Vacuum evacuating
Refrigerant charge
Refrigerant charge
Gas leakage check
R410A Air to Water Hear Pump
installation
For R410A
Conventional
Existence of new
equipment can be
equipment
YES
YES
YES
YES
YES
8
Service Manual
Conventional refrigerant
Air to Water Heat Pump
installation
New equipment can be
used with conventional
used
refrigerant
NO
NO
YES
NO
YES
NO
NO
YES
NO
NO
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