Table of Contents
Advertisement
P/N 3141959_C
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 .
— LOCK OUT / TAG OUT —
To avoid serious injury or death from electri-
cal shock, always disconnect the electrical
power at the main disconnect when servicing
or replacing any electrical component. This
includes, but is not limited to, such items as
doors, lights, fans, heaters, and thermostats.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
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 .
Component parts shall be replaced with like
components, and servicing shall be done by
factory authorized service personnel only, so
as to minimize the risk of possible ignition
due to incorrect parts or improper service.
Extreme care must be taken not to overfill 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 .
FNGSC-A Self Contained Merchandisers
2-9
Advertisement
Table of Contents
