Hoshizaki DCM 300BAH(-OS) Ice Maker User Manual


  Open as PDF
of 55
 
39
1. Refrigerant Recovery
This icemaker is provided with refrigerant access valves. Using proper refrigerant
practices, recover the refrigerant from the service valves and store it in an approved
container. Do not discharge the refrigerant into the atmosphere.
2. Brazing
WARNING
•R-404Aitselfisnotammableatatmosphericpressureandtemperaturesupto
176°F (80°C).
•R-404Aitselfisnotexplosiveorpoisonous.However,whenexposedtohigh
temperatures(openames),R-404Acanbedecomposedtoformhydrouoric
acidandcarbonyluoridebothofwhicharehazardous.
•Donotusesilveralloyorcopperalloycontainingarsenic.
•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ttingswhilepurgingwithnitrogengasowingatapressureof3to4PSIG.
NOTICE
•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
ow.
•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.
3. Evacuation and Recharge (R-404A)
1) Attach a vacuum pump to the system. Be sure to connect charging hoses to both high
and low-side access valves.
IMPORTANT
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.
2) Turn on the vacuum pump. Open the gauge manifold valves. Never allow the oil in the
vacuumpumptoowbackwards.
3) Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends
on pump capacity.
 previous next