Removal And Replacement Of Components; Service For Refrigerant Lines; [A] Service Information - Hoshizaki FM-170AFE Service Manual

VI. REMOVAL AND REPLACEMENT OF COMPONENTS

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 30 minutes in replacement or service. Do
not mix lubricants of different compressors even if both are charged with R134a, except
when they uses the same lubricant.
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
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 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 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
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 and let it into the tubing, or 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 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
tubes are used in the shipped units.)
29