Precautions in Servicing The Models with New-type Refrigerant
Si33-105
246
Appendix R407C PLUS Series Heat Recovery System
4.
Precautions in Servicing The Models with New-
type Refrigerant
Compared to the conventional refrigerant R22, the brand-new refrigerant R407C is higher in
pressure. The refrigerant oil is also different in type. With this in mind, note that the piping work
procedures as well as the related tools and piping materials are partially different than ever
before.
4.1
Tools Required
Some specific tools are required for servicing the refrigerant line of the new-type refrigerant
models. Select the right tools referring to the table below.
Typical tools and materials for piping works and their interchangeability
Refrigerant
Conventional type
New type
R22 (single)
R407C (mixed)
Refrigerant oil
Mineral oil (Suniso) Synthetic oil (ether)
Condensation pressure
1.84MPa
2.01MPa
Name
Work process and application
Interchangeability with conventional tools and materials
Pipe cutter
Refrigerant piping
work
Cutting pipes
Interchangeable.
Flaring tool
Flaring pipes
Refrigerant oil
Applying on flared spots Specified ether oil, ester oil, alkyl benzene oil or their
mixture to be used.
Torque wrench
Connecting flare nut
Interchangeable.
Pipe expander
Expanding pipes at
connections
Pipe bender
Bending pipes
Nitrogen
Air-tightness test
Inhibiting oxidation in
pipes
Welder
Brazing pipes
Gauge manifold
Air-tightness test
thru refrigerant
recharging
Vacuum refrigerant
charging and running
test
Specific tools required for boosting the pressure and
preventing impurities from coming in.
Charging hose
Vacuum pump
Vacuum drying
Interchangeable.
(Adapter to be connected to keep the oil from flowing
back to the unit during pump shut-down. Pump with anti-
backflow function also available.)
Charging cylinder
Refrigerant recharging
Conventional cylinder not allowed because of different
refrigerant properties. (Need to weigh with the scale.)
Refrigerant
charging scale
Interchangeable.
Gas leak detector
Gas leak test
Specific detector needed. (R134a-compatible detector
allowed.)
Summary of Contents for R407C PLUS
Page 1: ...System R407C PLUS Series Heat Recovery System Si33 105 Service Manual ...
Page 11: ...Introduction Si33 105 x ...
Page 41: ...Specifications Si33 105 30 Specifications R407C PLUS Series Heat Recovery System ...
Page 147: ...Test Operation Si33 105 136 Test Operation R407C PLUS Series Heat Recovery System ...
Page 263: ...Si33 105 iv Index ...
