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13 WORKING ON THE SEALED SYSTEM
13.1 Safe Work Practices
Safe work practices cannot be overstated. If your work practices are not to a safe standard, you may cause
damage not only to your customer’s property, but also to yourself.
It is important that on all refrigeration systems being serviced, the type of refrigerant is identified before work
commences. The serial plate will indicate the gas type and so will the label on the compressor.
Do
NOT
charge flammable refrigerants into refrigerators designed to operate on R12 or R134a.
If the system contains R600a refrigerant:
•
Don’t work on the appliance in a confined space. Always work in a well-ventilated area.
•
Don’t use mechanical devices to speed up the defrosting process.
•
Don’t use electrical tools (e.g. battery drill) that could be a source of ignition inside the appliance in case
the appliance should have a gas leak.
•
Always purge the system with Dry Nitrogen prior to lighting a gas torch.
13.2 Leak Detection
There are special leak detectors available for R600a. Don’t use your old leak detector that you have for R12
/ R134a with the R600a system unless it specifies that it can be used for R600a.
Leak detection fluid and a small paintbrush works well.
13.3 R600a Operating Pressures
The working pressures are a lot lower than what we have seen with R12 and R134a systems.
•
The high side
600Kpa / 90PSI @ 32
O
C
350Kpa / 50PSI @ 18
O
C
•
The low side
-50Kpa / -14.8 inches vacuum @ 32
O
C
-30Kpa / -9 inches vacuum @ 18
O
C
13.4 Reclaiming
If venting R600a out of a system that is being worked on, there is no legal requirement to reclaim it. Note,
however, that the refrigerant is flammable.
•
Be aware of the surroundings.
•
Have no ignition sources nearby.
•
Either release it outside or use a hose to vent it outside.
•
R600a is heavier than air and will hang around at floor level.
Summary of Contents for 635 Active Smart
Page 1: ...321144 Service Manual 635 680 790 900 Active Smart Refrigerator Freezer R134a R600a Systems...
Page 2: ...321144 2...
Page 96: ...321144 96 Photo 12 22 5...
Page 100: ...321144 100 Diagram 12 25...
Page 108: ...321144 108 13 11 Embraco Compressor Fitted With External Overload Diagram 13 11...
Page 114: ...321144 114 14 2 Non Ice Water Models Wiring Diagram...
Page 116: ...321144 116 14 4 Ice Water Models Wiring Diagram...
Page 117: ...321144 117 14 5 900 Models Power Control Module Wiring Connections Reciprocating Compressor...
Page 118: ...321144 118 14 6 900 Models Wiring Diagram Reciprocating Compressor...
Page 119: ...321144 119 14 7 900 Models Power Control Module Wiring Connections VC Compressor...
Page 120: ...321144 120 14 8 900 Models Wiring Diagram VC Compressor...
Page 121: ...321144 121 14 9 B Model Wiring Route Diagram 14 9...
Page 122: ...321144 122 14 10 T Model Wiring Route Diagram 14 10...
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