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V. REMOVAL AND REPLACEMENT
1. SERVICE FOR REFRIGERANT LINES
[a] SERVICE INFORMATION
1) Treatment for Refrigerant Leak [R744]
If a refrigerant leak occurs from an icemaker, ice production will be reduced. A continuous
refrigerant leak will eventually cause an icemaker protector to trip to stop the icemaker. In
case of a refrigerant leak, stop the icemaker and turn off the solenoid valve. Then, identify
where the leak occurs to fix it. After fixing, thoroughly evacuate the icemaker before turning
it on.
2) Handling of Handy Flux [R744]
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.
3) Oil for Processing of Copper Tubing [R744]
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.
4) Service Parts for R744
Some parts used for refrigerants other than R744 are similar to those for R744. But never
use any parts unless they are specified for R744 because their endurance against the
refrigerant has not been evaluated. Also, for R744, do not use any parts that have been
used for other refrigerants. Otherwise, wax and chlorine remaining on the parts may
adversely affect R744
5) Replacement Copper Tubing [R744]
The copper tubes currently in use are suitable for R744. 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.)
6) Evacuation, Vacuum Pump and Refrigerant Charge [R744]
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 gauge manifold to be used for evacuation and refrigerant charge should be exclusively
for R744.
8) Refrigerant Leak Check
Refrigerant leaks can be detected by charging the unit with a little refrigerant, raising the
pressure with nitrogen and using an electronic detector. Do not use air or oxygen instead
of nitrogen for this purpose.
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