Hussmann microSC MDN-BA Installation & Operation Manual page 22

P/N 9FQ-6-P110-075-00_B
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 .
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
WATER OUTLET AND WATER SEAL
The condensate water outlet is located in the
center of the merchandiser . The outlet has a
factory installed, external water seal .
For self contained models, this water seal
drains into the condensate evaporator pan
located beneath the merchandiser . The pan uses
a thermistor that senses water in the pan and
adjusts the amount of heat required to
evaporate the water . Ensure the drain hose
is properly trapped, and the drain area is not
clogged.
NOTE: All lower base panels must be in place
when the refrigerator is operating . If not, air-
flow from the condenser will be directed over
the evaporator pan and defrost water in the
pan may overflow .
Refrigeration lines are under pressure.
Refrigerant must be recovered before
attempting any connection or repair.
Open Vertical Merchandisers
2-11