Ultra Low Front
Rear Load
Excel
P/N 0501930_G
2-1
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
REFRIGERANT
The correct type of refrigerant will be stamped
on each merchandiser’s serial plate . The
merchandiser refrigeration piping is leak test-
ed, factory sealed and pressurized . Before
making refrigeration hookups, depress the uni-
versal line valve to ensure that coils have main-
tained pressure during shipment . When using
high glide refrigerants (e .g ., R-407A, R-448A),
if superheat needs to be adjusted, use the evap-
orator pressure and subtract the dew point
from the coil outlet refrigerant temperature to
measure the superheat level .
REFRIGERANT PIPING
Connection Location
The refrigerant line connections are at the
right- hand end of the merchandiser (as viewed
from the back) at the back of the canopy .
Multiplexing
Piping of merchandisers operating on the same
refrigeration system may be run from case
to case .
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 .
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 the information on the
next page for branch line piping 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 / ELECTRICAL
Refrigeration lines are under pressure
and should be depressurized before
attempting to make any connections.
Refrigeration Connection
Case-to-Case
Electrical Connection
C
O
O
L
E
R
W
A
L
L
D6X-URLE
D5X-URLE
Piping
Location
Pan
Floor
Fan
Plenum
