Refrigeration / Electrical; Refrigerant; Refrigerant Piping - Hussmann IMPACT LW Installation And Operation Manual

P/N 0395730F

REFRIGERANT

The correct type of refrigerant will be
stamped on each merchandiser's serial plate.
The merchandiser refrigeration piping is leak
tested, factory sealed and pressurized. Before
making refrigeration hookups, depress
Schrader valve to ensure that coils have
maintained pressure during shipment.
WARNING
!
Refrigeration lines are under pressure and
should be depressurized before attempting
to make any connections.

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 merchandiser.
After connections have been made, seal this out-
let thoroughly. Seal both the inside and the out-
side. We recommend using an expanding
polyurethane foam insulation.
CAUTION
!
Splashguard brackets MUST be installed
before piping merchandiser.
HUSSMANN CORPORATION, BRIDGETON, MO 63044-2483 U.S.A.

REFRIGERATION / ELECTRICAL

Multiplexing
Piping of merchandisers operating on the same
refrigeration system may be run from merchan-
diser to merchandiser D
ANT LINES THROUGH MERCHANDISERS THAT ARE
NOT ON THE SAME REFRIGERATION SYSTEM
as this may result in poor refrigeration
BRANCH
control and compressor failure.
Interconnecting piping inside the merchandiser
must be positioned to allow room for lifting the
hinged fan plenums and for clearance beneath the
display pans.
Line Sizing
Refrigerant lines should be sized as shown on
the refrigeration legend that is furnished for the
store or according to ASHRAE guidelines.
Note: If Koolgas defrost is used, the liquid line
will need to be increased two sizes larger inside
the merchandiser area. This is necessary to
ensure even liquid drainage from all evaporators
during defrost.
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
2-1
O NOT RUN REFRIGER
or
.
Low Temperature
-