Hoshizaki TempGuard FH1-SSB, Service Manual, Page: 31 / 63

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IV. Removal and Replacement of Components
IMPORTANT
1. Ensure all components, fasteners and thumbscrews are securely in place
after the equipment is serviced.
. The Polyol Ester (POE) oils used in R-404A units can absorb moisture
quickly. Therefore it is important to prevent moisture from entering the system
when replacing or servicing parts.
3. Always install a new drier every time the sealed refrigeration system is
opened. Do not replace the drier until after all other repair or replacement
has been made.
4. Do not leave the system open for longer than 15 minutes when replacing or
servicing parts.
A. Service for Refrigerant Lines
WARNING
Do not use R-404A as a mixture with pressurized air for leak testing.
Refrigerant leaks can be detected by charging the unit with a trace of
refrigerant, raising the pressure with nitrogen and using an electronic leak
detector.
1. Refrigerant Recovery
The unit is provided with refrigerant access valves. Using proper refrigerant practices
recover the refrigerant from the access valves and store it in an approved container. Do
not discharge the refrigerant into the atmosphere.
2. Brazing
WARNING
1. Refrigerant R-404A itself is not flammable at atmospheric pressure and
temperatures up to 176°F (80°C).
. Refrigerant R-404A itself is not explosive or poisonous. However, when
exposed to high temperatures (open flames) R-404A can be decomposed to
form hydrofluoric acid and carbonyl fluoride both of which are hazardous.
3. Always recover the refrigerant and store it in an approved container. Do not
discharge the refrigerant into the atmosphere.
4. Do not use silver alloy or copper alloy containing arsenic.
5. Do not use R-404A as a mixture with pressurized air for leak testing.
Refrigerant leaks can be detected by charging the unit with a trace of
refrigerant, raising the pressure with nitrogen and using an electronic leak
detector.