Hoshizaki KM-151BAH - Manual (Page 42)

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V. REMOVAL AND REPLACEMENT
1. SERVICE FOR REFRIGERANT LINES
[a] SERVICE INFORMATION
1) Allowable Compressor Opening Time and Prevention of Lubricant Mixture
[R134a]
The compressor must not be opened more than 15 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 [R134a]
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 lower 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
R134a has possibly drawn in air, the drier must be replaced. Be sure to use a drier
designed for R134a.
3) Handling of Handy Flux [R134a]
Repair of the refrigerant circuit requires 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 circuit should be avoided as much as possible.
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 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 R134a
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 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 affect R134a.
6) Replacement Copper Tubing [R134a]
The copper tubes currently in use are suitable 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