hussmann P/N 0387183_D - Manual (Page 11)

Reach-In
REFRIGERANT
The correct type of refrigerant will be stamped on
each merchandiser’s serial plate which is located
on the left-hand end of the interior top liner.
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.
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.
Multiplexing
Piping of merchandisers operating on the same
refrigeration system may be run from merchan-
diser to merchandiser through the end frame
saddles provided for this purpose. D
O
NOT
RUN
REFRIGERANT LINES THROUGH MERCHANDISERS
THAT ARE NOT ON THE SAME REFRIGERATION
SYSTEM as this may result in poor refrigeration
control and compressor failure.
NOTE: If Gas 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.
Line Sizing
Refrigerant lines should be sized as shown on the
refrigeration legend that is furnished for the store
or according to ASHRAE guidelines.
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 .
INSULATION
With GAS Defrost
The suction and liquid lines should NOT contact
each other and should be insulated separately
for a minimum of 30 ft (9144 mm) from the
merchandiser.
With OTHER Than Gas Defrost
The suction and liquid lines should be clamped or
taped together and insulated for a minimum of
30 ft (9144 mm) from the merchandiser.
With All Defrost
Additional insulation for the balance of the liquid
and suction lines is recommended wherever
condensation drippage is objectionable or the
lines are exposed to ambient conditions.
P/N 0387183_D 2-1
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
REFRIGERATION / ELECTRICAL
When brazing pipes be sure to use the
insulation blanket shipped with the
merchandiser to prevent damage to
the plastic case bottom.
CAUTION
!
Refrigeration lines are under pressure and
should be depressurized before attempting
to make any connections.
WARNING
!