Hoshizaki FM-150KE(-N) Service Manual page 52

9) Disconnect the charging hose from the access valve. Always cap the access valve to
prevent a refrigerant leak.
10) Always thoroughly leak test all joints and valve caps.
11) Avoid charging large quantities of liquid into the low side in case of damage to the
compressor.
R404A models
1) Attach charging hoses of a gauge manifold to a vacuum pump, the low-side access
valve and the high-side access valve (to be fitted by service personnel).
2) Open the low-side and high-side valves on the gauge manifold, and turn on the vacuum
pump.
3) Allow the vacuum pump to pull down to a 760 mmHg vacuum. Evacuating period
depends on the pump capacity.
4) Close the low-side and high-side valves on the gauge manifold.
5) Disconnect the vacuum pump, and attach a refrigerant charging cylinder to accurately
weigh in the liquid charge. Remember to purge any air from the charging hose. See the
nameplate for the required refrigerant charge.
6) Open the high-side valve on the gauge manifold and the valve on the charging cylinder.
Note: Always charge in the liquid stage, as many refrigerants are blends and vapour
charging will affect the blend consistency.
7) When no more refrigerant is drawn in, turn on the icemaker. When the required amount
of refrigerant has been charged, close the valve on the charging cylinder and turn off the
icemaker.
8) Close the high-side valve on the gauge manifold.
9) Disconnect the charging hoses from the access valves. Always cap the access valves to
prevent a refrigerant leak.
10) Always thoroughly leak test all joints and valve caps.
11) Avoid charging large quantities of liquid into the low side in case of damage to the
compressor.
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