Toshiba HWS-1105H-E, Installation Manual

Page: 10 / 29

– 9 –
Air to Water Heat Pump
Installation Manual
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 Use How to use tools / equipment
Gauge manifold
Vacuuming / charging refrigerant
and operation check
Prepared newly for R410A only
Charging hose Prepared newly for R410A only
Charging cylinder Can not be used
Unusable (Use the refrigerant charging measure
instead.)
Gas leak detector Gas leak check Prepared newly
Vacuum pump Vacuum drying Unusable
Vacuum pump with backflow
prevention function
Vacuum drying R22 (Conventional tools)
Flare tool Flare machining of pipes Usable if dimensions are adjusted.
Bender Bending pipes R22 (Conventional tools)
Refrigerant recovery equipment Refrigerant recovery For R410A only
Torque wrench Tightening flare nuts Exclusive for Ø12.7 mm and Ø15.9 mm
Pipe cutter Cutting pipes R22 (Conventional tools)
Welding machine and nitrogen
cylinder
Welding pipes R22 (Conventional tools)
Refrigerant charging measure Charging refrigerant R22 (Conventional tools)
9-EN