Hoshizaki KM-260BAH User Manual download pdf (Page 52)

8) If necessary, add any remaining charge to the system through the low-side. Use a

throttling valve or liquid dispensing device to add the remaining liquid charge through

the low-side access valve with the unit running.

9) Close the gauge manifold valves and disconnect the gauge manifold hoses.

10) Cap the access valves to prevent a possible leak.

2. BRAZING

WARNING

1. R-404A itself is not ﬂ ammable at atmospheric pressure and temperatures

up to 176°F (80°C).

2. R-404A itself is not explosive or poisonous. However, when exposed to

high temperatures (open ﬂ ames), R-404A can be decomposed to form

hydroﬂ uoric acid and carbonyl ﬂ uoride 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 trace of refrigerant to the system (if using an electronic leak detector),

and then raise the pressure using nitrogen gas (140 PSIG). DO NOT

use R-404A as a mixture with pressurized air for leak testing.

1) Braze all ﬁ ttings while purging with nitrogen gas ﬂ owing at a pressure of 3 to 4 PSIG.

CAUTION

1. Always install a new drier every time the sealed refrigeration system is

opened.

2. Do not replace the drier 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 ﬂ ow.

3. When brazing, protect the drier by using a wet cloth to prevent the drier

from overheating. Do not allow the drier to exceed 250°F (121°C).

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 nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with

pressurized air for leak testing.

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Hoshizaki KM-260BAH User Manual Page 52