Brazing - Hoshizaki KM-280MAF-E Service Manual

recommends only virgin refrigerant or reclaimed refrigerant which meets
ARI Standard No. 700-88 be used.
6) Open the High-side Valve on the gauge Manifold, and accurately measure in the
liquid charge. Close the valve on the Charging Cylinder before closing the High-
side Manifold Valve. Any remaining liquid in the line can be charged into the low
side.
Note: Always charge in the liquid stage, as many refrigerants are blends and
vapour charging will affect the blend consistency (e.g. R404A).
7) Turn on the icemaker. Release the High-side Access Connector, and allow pres-
sure in the charging line to slowly enter the Low-side of the system. Cap off the
High-side Access Valve. When prssure reduces on the low side, disconnect the
Low-side charging line and cap off the Access Valve.
8) Always cap the Access Valves to prevent a refrigerant leak.
9) Always thoroughly leak test all joints and valve caps.
10) Avoid charging large quantities of liquid into the low side in case of damage to the
Compressor.

2. BRAZING

1. Refrigerant R-404A itself is not flammable at atmospheric pressure and
temperatures up to 176°F (80°C).
2. 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 hazard-
ous.
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 little refrig-
erant, raising the pressure with nitrogen and using an electronic leak
detector.
Note: All brazing-connections inside the Evaporator Case are clear-paint coated.
Sandpaper the brazing connections before unbrazing the components. Use a
good abrasive cloth to remove coating.
DANGER
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