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Air to Water Heat Pump
3
Installation of new refrigerant air to water
heat pump
• The R410A refrigerant is more susceptible to impurities such as water, oxide membranes, oils, and fats.
With the adoption of the new refrigerant, the refrigerating oil has also been changed.
Be careful not to let water, dust, conventional refrigerant, and/or conventional refrigerating oil enter the
refrigerating cycle of the new refrigerant air to water heat pump.
• To prevent different refrigerant or refrigerating oil from becoming mixed, the sizes of the charging port of the unit
and the installation tool connection sections are different from those of the conventional refrigerant. Accordingly,
the following exclusive tools are required for the new refrigerant R410A.
Required tools / equipment and precautions for use
Prepare the tools and equipment listed in the following table before starting the installation work.
Newly prepared tools and equipment must be used exclusively.
Legend
: Prepared newly (Use for R410A only. Do not use for refrigerant R22 or R407C etc.)
: Conventional tools / equipment are available
Tools / equipment
Gauge manifold
Charging hose
Charging cylinder
Gas leak detector
Vacuum pump
Vacuum pump with backflow
prevention function
Flare tool
Bender
Refrigerant recovery equipment
Torque wrench
Pipe cutter
Welding machine and nitrogen
cylinder
Refrigerant charging measure
9-EN
Use
Vacuuming / charging refrigerant
and operation check
Can not be used
Gas leak check
Vacuum drying
Vacuum drying
Flare machining of pipes
Bending pipes
Refrigerant recovery
Tightening flare nuts
Cutting pipes
Welding pipes
Charging refrigerant
– 9 –
How to use tools / equipment
Prepared newly for R410A only
Prepared newly for R410A only
Unusable (Use the refrigerant charging measure
instead.)
Prepared newly
Unusable
R22 (Conventional tools)
Usable if dimensions are adjusted.
R22 (Conventional tools)
For R410A only
Exclusive for Ø12.7 mm and Ø15.9 mm
R22 (Conventional tools)
R22 (Conventional tools)
R22 (Conventional tools)
Installation Manual
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