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Part No. 30911 Rev. A September 2020
- 42 -
Visair Refrigerated Cabinets
R-290 SERVICING FLOW CHART
Before starting work on the R-290 system, turn on the gas-
leak detector and place it on the floor, next to the cabinet.
Refrigeration Circuit Access
Comments
1 Disconnect electrical supply to appliance.
If possible, ground the appliance to avoid
static electric sparks.
2
Access condenser/compressor and install two
piercing valves.
Vent both the high and low side of the system
in case there is a blocked cap tube and/or
drier.
3
Connect your refrigeration gauge equipped
with 30cm hoses to the two piercing valves.
4
Connect the yellow hose of your gauge set to
a recovery bag or a venting tube, if a safe
venting location is available.
5
Once the charge is removed, connect the
Nitrogen tank.
6
Purge Nitrogen through the system for a min.
of 10 seconds.
If using a recovery bag, be sure to take it to a
safe location and vent.
7
Always cut the compressor or other
components out with a tubing cutter.
8
Purge Nitrogen through the system at 70 to
140 hPa, before any parts must are un-brazed.
9
Purge Nitrogen through system at 70 to 140
hPa, while brazing in new components.