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11. REFRIGERANT SERVICE INFORMATION
11. REFRIGERANT SERVICE INFORMATION
1) Allowable Compressor Opening Time and Prevention of Lubricant Mixture [R134a]
1) Allowable Compressor Opening Time and Prevention of Lubricant Mixture [R134a]
The compressor must not be opened more than 30 minutes in replacement or service. Do
The compressor must not be opened more than 30 minutes in replacement or service. Do
not mix lubricants of different compressors even if both are charged with R134a, except
not mix lubricants of different compressors even if both are charged with R134a, except
when they uses the same lubricant.
when they uses the same lubricant.
2) Treatment for Refrigerant Leak [R134a]
2) Treatment for Refrigerant Leak [R134a]
If a refrigerant leak occurs in the low side of an ice maker charged with R134a, air may be
If a refrigerant leak occurs in the low side of an ice maker charged with R134a, air may be
drawn in. Even if the low side pressure is higher than the atmospheric pressure in normal
drawn in. Even if the low side pressure is higher than the atmospheric pressure in normal
operation, a continuous refrigerant leak will eventually lower the low side pressure below the
operation, a continuous refrigerant leak will eventually lower the low side pressure below the
atmospheric pressure and will cause air suction. Air contains a large amount of moisture,
atmospheric pressure and will cause air suction. Air contains a large amount of moisture,
and ester easily absorbs a lot of moisture. If an ice maker charged with R134a has possibly
and ester easily absorbs a lot of moisture. If an ice maker charged with R134a has possibly
drawn in air, the drier must be replaced. Be sure to use a drier designed for R134a.
drawn in air, the drier must be replaced. Be sure to use a drier designed for R134a.
3) Handling of Handy Flux [R134a]
3) Handling of Handy Flux [R134a]
Repair of the refrigerant circuit needs brazing. It is no problem to use the same handy flux
Repair of the refrigerant circuit needs brazing. It is no problem to use the same handy flux
that has been used for the current refrigerants. However, its entrance into the refrigerant
that has been used for the current refrigerants. However, its entrance into the refrigerant
circuit should be avoided as much as possible.
circuit should be avoided as much as possible.
4) Oil for Processing of Copper Tubing [R134a]
4) Oil for Processing of Copper Tubing [R134a]
When processing the copper tubing for service, wipe off oil, if any used, by using alcohol or
When processing the copper tubing for service, wipe off oil, if any used, by using alcohol or
the like. Do not use too much oil and let it into the tubing, or wax contained in the oil will clog
the like. Do not use too much oil and let it into the tubing, or wax contained in the oil will clog
the capillary tubing.
the capillary tubing.
5) Service Parts for R134a
5) Service Parts for R134a
Some parts used for refrigerants other than R134a are similar to those for R134a. But never
Some parts used for refrigerants other than R134a are similar to those for R134a. But never
use any parts unless they are specified for R134a because their endurance against the
use any parts unless they are specified for R134a because their endurance against the
refrigerant have not been evaluated. Also, for R134a, do not use any parts that have been
refrigerant have not been evaluated. Also, for R134a, do not use any parts that have been
used for other refrigerants. Otherwise, wax and chlorine remaining on the parts may adversely
used for other refrigerants. Otherwise, wax and chlorine remaining on the parts may adversely
affect R134a.
affect R134a.
6) Replacement Copper Tubing [R134a]
6) Replacement Copper Tubing [R134a]
The copper tubes currently in use are available for R134a. But do not use them if oily inside.
The copper tubes currently in use are available for R134a. But do not use them if oily inside.
The residual oil in copper tubes should be as little as possible. (Low residual oil type copper
The residual oil in copper tubes should be as little as possible. (Low residual oil type copper
tubes are used in the shipped units.)
tubes are used in the shipped units.)
7) Evacuation, Vacuum Pump and Refrigerant Charge [R134a]
7) Evacuation, Vacuum Pump and Refrigerant Charge [R134a]
Never allow the oil in the vacuum pump to flow backward. The vacuum level and vacuum
Never allow the oil in the vacuum pump to flow backward. The vacuum level and vacuum
pump may be the same as those for the current refrigerants. However, the rubber hose and
pump may be the same as those for the current refrigerants. However, the rubber hose and
gauge manifold to be used for evacuation and refrigerant charge should be exclusively for
gauge manifold to be used for evacuation and refrigerant charge should be exclusively for
R134a.
R134a.
74NL5870112
74NL5870112
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