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PN_3155541_E
REPLACING REFRIGERATION SYSTEM COMPONENTS
Only Hussmann service technicians or technicians
qualified to handle R-290 (propane) refrigerant
should service or repair this R-290 (propane)
equipment Failure to follow instructions can result
in an explosion, death, injury and property damage.
STEPS TO RECOVER REFRIGERANT
1. Make sure you are in a well ventilated area before making any service or repair to the refrigeration system.
2. Disconnect all power sources from the system. Some systems may have more than one plug or power supply.
3. Tap system with line tap valves, attaching gauges to the high and low sides
of the system.
4. Secure so that the solenoid valves are open to correct evacuation; use a
recommended tool (solenoid valve magnet). Place solenoid magnet over
the enclosing tube, which creates a magnetic field to lift the plunger and
stem assembly. This is strongly recommended during refrigerant recovery and
evacuation process. Recommended suppliers for the use of solenoid valve
magnet as a field tool to operate manually solenoid valve:
1. JB
2. YELLOW JACKET
3. CPS
5. Connect hose to an evacuated recovery tank.
Open refrigeration gauges and recovery tank.
6. With the suction valve in vacuum, the refrigerant will be recovered into the recovery tank.
7. Once recovered, close the tank valve and remove the guage from the tank and connect nitrogen tank to the
system to purge it with nitrogen.
8. Pull vacuum to a minimum of 200 microns or lower.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
This refrigeration system uses hot gas defrost and
incorporates a Normal Closed Solenoid. In order to remove
all the refrigerant for service, the valve must be held open
while the refrigerant is being evacuated. Failure to remove
all the refrigerant can cause a fire or explosion.
Make sure the system is purged through all access ports
(red marked). Components should be cut-out (tubing
cutters) as opposed to using a torch.
23
refrigeration
line tapping
valve
VRL Merchandisers
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