Refrigeration - Hussmann CHINO SGB Installation & Operation Manual

Refrigerant Type
Unless otherwise specifi ed on the factory order, remote
and self-contained merchandisers are equipped for
operation on R-404A refrigerant. The correct type of
refrigerant will be stamped on each merchandiser's
serial plate located inside the merchandiser.
Refrigeration Piping
Liquid
3/8" 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 SGB 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

10. Refrigeration

Suction
5/8" O.D.
8
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.
Insulation - 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
See Specifi cation Sheet
Physical Data
Merchandiser Drip Pipe (in.)
Merchandiser Liquid Line (in.)
Merchandiser Suction Line (in.)
4ft 1.2
5ft 1.5
6ft 1.8
*Dependent on case length and refrigerant type.
1½
3/8*
5/8*