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V. REMOVAL AND REPLACEMENT
Only trained service engineer can service the R290 refrigeration unit.
1. SERVICE FOR REFRIGERANT LINES
[a] SERVICE INFORMATION
1) Allowable Compressor Opening Time and Prevention of Lubricant Mixture [R290]
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 the same
refrigerant, except when they use the same lubricant.
2) Treatment for Refrigerant Leak [R290]
If a refrigerant leak occurs in the low side of an ice maker, air may be drawn in. Even if the
low side pressure is higher than the atmospheric pressure in normal operation, a
continuous refrigerant leak will eventually reduce the low side pressure below the
atmospheric pressure and will cause air suction. Air contains a large amount of moisture,
and ester oil easily absorbs a lot of moisture. If an ice maker charged with R290 has
possibly drawn in air, the drier must be replaced. Be sure to use a drier designed for R290.
3) Handling of Handy Flux [R290]
Brazing is needed to connect the refrigeration circuit pipes. It is no problem to use the
same handy flux that has been used for the current refrigerants. However, its entrance
into the refrigerant circuit should be avoided as much as possible.
4) Oil for Processing of Copper Tubing [R290]
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 or let it into the tubing, as wax contained in the oil will clog
the capillary tubing.
5) Service Parts for R290
Some parts used for refrigerants other than R290 are similar to those for R290. But never
use any parts unless they are specified for R290 because their endurance against the
refrigerant has not been evaluated. Also, for R290, do not use any parts that have been
used for other refrigerants. Otherwise, wax and chlorine remaining on the parts may
adversely affect the R290.
6) Replacement Copper Tubing [R290]
The copper tubes currently in use are suitable for R290. 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 tubes are used in the shipped units.)
WARNING
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