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If a leak is detected, follow store safety procedures. It is the store's
responsibility to have a written safety procedure in place. The safety
procedure must comply with all applicable codes such as local fire
department's codes.
At minimum, the following actions are required:
•
Immediately evacuate all persons from the store, and contact
the local fire department to advise them that a propane leak has
occurred.
•
Call Hussmann and/or a qualified service agent and inform them
that a propane sensor has detected the presence of propane.
•
Do not let any persons back into the store until the qualified
service technician has arrived and that technician advises that it
is safe to return to the store.
•
The propane gas used in the unit has no odor. The lack of smell
does not indicate a lack of escaped gas.
•
A hand-held propane leak detector ("sniffer") should be used
before any repair and/or maintenance is attempted. All repair
parts must be identical models to the ones they are replacing.
•
No open flames, cigarettes or other possible sources of ignition
should be used inside the building where the units are located
until the qualified service technician and/or local fire department
determines that all propane has been cleared from the area and
from the refrigeration systems.
COMPRESSOR SAFETY
The CoreLink Controller for these cases is programmed with a
compressor discharge safety that cuts power to the compressor if the
discharge temperature exceeds 260°F to protect the compressor in
the event of high cooling water temperature or other malfunctions. It
uses a sensor that is located on the compressor discharge line of each
compressor, and each compressor is controlled independently. This also
provides an alarm if the temperature is exceeded.
HUSSMANN CORPORATION • U.S. & CANADA 1-800-922-1919 • BRIDGETON, MO 63044-2483 • MEXICO 1-800-890-2900 • WWW.HUSSMANN.COM • PN 3053328_H
SEQUENCE OF OPERATION:
Refrigeration:
Compressor is cycling on discharge air temp. Fans stay on when
compressor cycles off.
•
Ice Cream application: Setpoint -10°F average discharge air
temp, 6°F differential
•
Medium Temp application: Setpoint 37°F average discharge air
temp, 6°F differential
•
Frozen food application: Setpoint -3°F average discharge air
temp, 6°F differential
DEFROST
Once per day
Low temperature:
•
Fans off during defrost
•
Defrost heaters on
•
Drain pan heater on
•
Compressor off
Medium temperature:
•
Fans on during defrost
•
No defrost or drain pan heaters
•
Compressor off
Defrost Termination
Defrost is terminated by a sensor located on the following locations:
2 and 3 door cases: Left return bend, center of the coil
4 and 5 door cases: Right return bend, center of the coil
When defrost terminates, the fans stay off until defrost termination
sensor reaches 20°F to provide a drip cycle (for low temperature
cases).
Defrost is initiated and terminated for both units at the same time, and
terminates when the defrost termination sensor reaches 48 degrees.
The controller incorporates a 5-second delay between startup of the
two compressors.
2-10
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