Precautions in Servicing the Models with New-type Refrigerant
SiE33-003
168
New Refrigerant R-407C
1. Precautions in Servicing the Models with New-type
Refrigerant
Compared to the conventional refrigerant R22, the brand-new refrigerant R-407C 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.
1.1
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)
R-407C (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.)
Si33-003.book Page 168 Monday, June 25, 2001 9:06 AM
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