REFRIGERANT
The correct type of refrigerant will be stamped
on each merchandiser’s serial plate. The case
refrigeration piping is pressurized, leak tested
and factory sealed. Before making refrigeration
hookups, depress universal line valve to ensure
that coils have maintained pressure during
shipment.
REFRIGERANT PIPING
Connection Location
The refrigerant line outlets are located under the
fixture towards the center (refer plan view ).
Insulate suction lines to prevent condensation
drippage on the floor.
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 data sheet included with this manual for
specific information on the case you are installing.
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
The suction and liquid lines should be clamped
or taped together and insulated for a minimum of
30 feet from the merchandiser. Additional insula-
tion for the balance of the liquid and suction lines
is recommended wherever condensation drippage
is objectionable or lines are exposed to ambient
conditions.
SUCTION LINE
• Pitch in direction of flow.
• May be reduced by one size at one third of case
run load and again after the second third. Do
not reduce below the case suction line size.
• Case suction lines
should enter at the
top of the branch
line.
LIQUID LINE
• May be reduced by one size after one half the
case run load. Do not reduce below the case
liquid line connection size.
• Take-offs to case liquid lines should exit the
bottom of the
branch liquid
line. Provide an
expansion loop
for each evapo-
rator take-off.
(Minimum 3 in.
(76 mm) loop.)
REFRIGERATION / ELECTRICAL
Refrigeration lines are under pressure and
should be depressurized before attempting to
make any connections.
WARNING
!
Island & Multi-deck Island
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
P/N 0446551_A
2-1
Suction Line Return
Minimum Loop
3-in. (76 mm)
Liquid Line Take Off
