Hoshizaki MODULAR CRESCENT CUBER SERENITY SERIES KMS-1400MLH Benutzerhandbuch

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2. Brazing.

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. 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) 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. Install the 
new drier with the arrow on the drier in the direction of the refrigerant flow.

) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.

Note: Because the pipes in the evaporator case are specially coated to resist corrosion, 

it is important to make connections outside the evaporator case when possible. If 
it is necessary to braze inside the evaporator case, use sandpaper to remove the 
coating from the brazing connections before unbrazing the components.

3) 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) Attach a vacuum pump to the system. Be sure to connect the charging hoses to both 

high and low-side lines.

The vacuum level and vacuum pump may be the same as those for current
refrigerants. However, the rubber hose and gauge manifold to be used for
evacuation and refrigerant charge should be exclusively for POE oils. 

) Turn on the vacuum pump. Open the system service valves and service manifold 

valves. Never allow the oil in the vacuum pump to flow backwards.

3) Allow the vacuum pump to pull down to a 9.9" Hg vacuum. Evacuating period depends 

on pump capacity.

4) Close the low-side valve and high-side valve on the service manifold.