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P/N 3116321_A
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 . Connect hose to an evacuated recovery tank . Open
refrigeration gauges and recovery tank .
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.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
refrigeration
line tapping
valve
5 . With the suction valve in vacuum, the refrigerant will
be recovered into the recovery tank .
6 . Once recovered, close the tank valve and remove
the gauge from the tank and connect nitrogen tank
to the system to purge it with nitrogen .
7 . Pull vacuum to a minimum of 200 microns or
lower .
CHARGING
A calibrated scale with +/-2 gram accuracy
must be used to charge the system . The charge
amount is shown on the serial plate . Only R-290
grade refrigerant can be used . Standard propane
does not meet the purity/moisture content of
R-290, and therefore cannot be used to charge
cases .
No gas charge adjustments are allowed . When
connecting hoses between the refrigeration
system, manifold gauges, and refrigerant
cylinder, ensure that the connections are secure
and there are no potential sources of ignition
nearby . Ensure that contamination of different
refrigerants does not occur when using charging
equipment . Use dedicated hoses to service
R-290 (propane) refrigeration systems . Hoses or
lines should be as short as possible to minimize
the amount of refrigerant contained in them .
Ensure that the refrigeration system is properly
grounded prior to charging the system with
refrigerant, to avoid the potential for static
build-up .
Island Self Contained R-290
2-3
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