68
Service for Refrigerant Lines
1. Refrigerant Recovery
This ice cream vending machine has a refrigerant service valve (nipple).
Recover the refrigerant through this nipple and keep the recovered refrigerant in an
approved storage bin. Never discharge the recovered refrigerant to the atmosphere.
2. Brazing
1. R-404A itself is not flammable at atmospheric pressure and temperatures is to
176
℉
(121
℃
)
2. R-404A itself is not explosive or poisonous. However, when exposed to high temperatures
(open flames), R-404A can be decomposed to form hyfrofluoric acid and carbonyl
fluoride both of which are hazardous.
3. Do not use silver alloy or copper alloy containing arsenic.
4. Use an electronic leak detector or soap bubbles to check for leaks. Add a then raise
the pressure trace of refrigerant to the system (if using an electronic leak detector),
and using nitogen gas (140PSIG). DO NOT use R-404A as a mixture with pressurized
air for leak testing
1) When brazing copper pipe, purge the pipe with nitrogen gas at pressure of 3~4 psig.
1. Always install a new drier every time the sealed refrigeration system is opened.
2. Do not replace the dried until after all other repair or replacement has been made.
Install the new drier with the arrow on the drier in the direction of the refrigerant flow
3. When brazing, protect the drier and 4-way valve by using a wet cloth to provent the
drier and 4-way valve from overheating, Do not allow the drier to exceed 250
℉
(121
℃
)
2) Use an electronic leak detector or soap bubbles to check for leaks.
Add a trace of refrigerant to the system (if using an electronic leak detector),
and then raise the pressure using nitogen gas (140PSIG). DO NOT use R-404A
as a mixture with pressurized air for leak testing.
WARING
CAUTION
Summary of Contents for ISI-271THS
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