9
Refrigeration
Refrigerant Type
Unless otherwise speci! ed on the factory order, remote and
self-contained merchandisers are equipped for operation
on R22 refrigerant. The correct type of refrigerant will be
stamped on each merchandiser’s serial plate located inside
the merchandiser.
Refrigeration Piping
Liquid
Suction
3/8" O.D.
5/8" O.D.
The refrigerant line connections are behind the rear
close-off panel, underneath the drain tub, on the left hand
end of the merchandiser as viewed from the rear. After
connections have been made, seal this outlet thoroughly.
Seal both inside and the outside. We recommend using an
aerosol dispensed urethane type of insulation. See SHVS
technical data sheet for proper duration and frequency.
Self contained cases have individual defrost time clocks.
When power has been applied, set the time clock to the
proper duration and frequency.
The time clock is located behind the front panel under the
case. Turn the clock dial counterclockwise until the pointer
is directed to the current time of day.
Multiplexing -
Piping of merchandisers operating on the
same refrigeration system may be run from merchandiser
to merchandiser through the end frame saddles provided
for this purpose.
DO NOT RUN REFRIGERANT LINES
THROUGH MERCHANDISERS THAT ARE NOT THE
SAME REFRIGERATION SYSTEM
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
(not furnished by Hussmann). If a legend has not been
furnished, refer to the Hussmann Application Engineering
Manual for guidance.
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.
I
nsulation -
The suction and liquid lines should be clamped
or taped together and insulated for a minimum of 30’ from
the merchandiser. Additional insulation is recommended
wherever condensation drippage is objectionable.
Refrigeration Data
Note:
This data is based on store temperature and humidity
that does not exceed 75F and 55% R.H.
Note:
Not recommended to control temp by regulating coil
temp allow T-STAT to cycle and control temp.
Btu/hr/ft*
See Spec Sheets
*For all refrigeration equipment other than Hussmann, use
conventional Btu values.
ELECTRIC or GAS Not Recommended
Physical Data
Merchandiser Drip Pipe (in.)
1½
Merchandiser Liquid Line (in.)
3/8*
Merchandiser Suction Line (in.)
5/8*
Estimated Charge (lb)***
4ft
1.2
5ft
1.5
6ft
1.8
*Dependent on case length and refrigerant type.
*** This is an average for all refrigerants types. Actual
refrigerant charge may vary by approximately half a
pound.
Glycol Requirements
GPM
PSI
4ft
0.8
2.3
5ft
1.0
3.3
6ft
1.2
5.2
