HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 (Printed in U.S.A.)
REFRIGERANT
The correct type of refrigerant will be stamped
on each merchandiser’s serial plate. The case
refrigeration piping is leak tested, factory
sealed and pressurized. Before making refrig-
eration hookups, depress the universal line
valve to ensure that coils have maintained
pressure during shipment.
REFRIGERANT PIPING
Connection Location
The refrigerant line connections are at the right-
hand end of the merchandiser (as viewed from the
front) beneath the display pans. A sticker marks
the location of the connection “pod.” The installer
must saw a hole through the pod to exit the case.
After connections have been made, seal this outlet
thoroughly. Seal both the inside and the outside.
We recommend using an expanding polyurethane
foam insulation.
Multiplexing
Piping of merchandisers operating on the same
refrigeration system may be run from merchandis-
er to merchandiser.
D
O NOT RUN REFRIGERANT
LINES THROUGH
MERCHANDISERS THAT ARE
NOT
ON THE
SAME
REFRIGERATION
SYSTEM
BRANCH
as this may result in poor refrigeration
control and compressor failure.
Interconnecting piping inside the merchandiser
must be located as shown below to allow room for
lifting the hinged fan plenums and for clearance
beneath the display pans. Or the interconnecting
piping may be run outside the case in the raceway
area shown.
Line Sizing
Refrigerant lines should be sized as shown on the
refrigeration legend that is furnished for the store
or according to ASHRAE guidelines. Refer to
information on the next page for branch line pip-
ing of Hussmann Equipment.
Oil Traps
P-traps (oil traps) must be installed at the base of
all suction line vertical risers.
Pressure Drop
Pressure drop can rob the system of capacity. To
keep the pressure drop to a minimum, keep the
refrigerant line run as short as possible using a
minimum number of elbows. Where elbows are
required,
USE LONG RADIUS ELBOWS ONLY
.
Refrigeration lines are under pressure and
should be depressurized before attempting
to make any connections.
WARNING
!
When brazing pipes be sure to use the
insulation blanket shipped with the
merchandiser to prevent damage to the
plastic case bottom.
CAUTION
!
Fan Plenum
Pan
Pod
Piping
Locations
