Steps To Recover Refrigerant; Charging - Hussmann VRM Installation & Operation Manual

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.
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 guage 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.
HUSSMANN CORPORATION • U.S. & CANADA 1-800-922-1919 • BRIDGETON, MO 63044-2483 • MEXICO 1-800-890-2900 • WWW.HUSSMANN.COM • PN 3034041_ J
Refrigeration
Line Tapping
Valve

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.
Extreme care must be taken not to over fill the refrigeration system.
After charging, carefully disconnect the hoses, attempting to minimize
the quantity of refrigerant released. Further leak check the service
ports, hoses, refrigerant tanks. The service ports shall be checked for
leaks using a hydrocarbon leak detector with a sensitivity of 3 grams/
year (0.106 Oz/year) leak rate.
Thoroughly leak check the service ports. If no leak is present, use a
pinch-off tool to close the ends of the service tubes before brazing
them shut. Remove all service ports. If a Schrader valve is used on the
compressor service tube, it must be removed and the previous steps
followed in order to braze the service tube shut.
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