Installation and Operation
Chest and Upright Freezers
6
1. Press and hold the Alarm Test pad. The digital temperature
display indicates rising temperature. When the temperature
reaches the warm alarm value, the alarm sounds.
Note:
The temperature of the refrigerated space does not
change during this procedure. Only the sensor is heated.
2. Release the Alarm Test pad, the sensor and display return to
cabinet temperature in a few minutes.
You can press the Audio Silence pad to silence the alarm but the
alarm will ring back in five to seven minutes. You can silence the
alarm in this manner as many times as necessary until the sensor
cools below the warm alarm temperature. The alarm quits
automatically when the sensor cools below the warm alarm
value.
Note:
There is a limit on the alarm test feature. The alarm test
will not commence if the warm alarm setpoint is more
than 15 degrees warmer than the operating temperature
setpoint.
6.3 Backup System (Optional)
When you purchase a built-in CO
2
or LN
2
optional backup
system for the freezer, the backup system control panel is located
behind a hinged panel adjacent to the grill (refer to Figure 3).
Note:
Always purchase the cylinders which are equipped with
siphon tubes for withdrawing liquid from the bottom of
the cylinder. CO
2
cylinders must be kept at room
temperature to function properly. LN
2
bottles are
functional at any reasonable temperature.
Use this panel to set the backup initiation temperature, usually
10 to 15
°
C warmer than the operating setpoint.
Figure 3. Control Panel for Optional
Built-In Backup System
Note:
Value Series units use free-standing, field installed
Backup Systems.
TEMPERATURE °C
PUSH
TO SET
SETPOINT
ADJUST
POWER
OFF
ON
Power
Switch
Temperature Control
Setpoint Screw
Temperature Control
Set Button
Digital Temperature
Display
Calibration Pot.
6.3.1 CO
2
and LN
2
Precautions
The following are precautions for using liquid CO
2
and LN
2
backup systems.
WARNING!
If a CO
2
or LN
2
cylinder falls and a
valve is knocked off, the cylinder becomes a deadly
and completely unguided missile. Transport the
cylinders in a handtruck or cart with secure chain ties
for the cylinder. After cylinders are connected to the
equipment, securely attach them with chains to a
solid, stationary object such as a building column.
WARNING!
CO
2
and LN
2
liquids are non-poisonous
but are very cold and will burn unprotected skin.
Always wear protective eyewear and clothing when
changing cylinders or working on the piping systems
attached to an active source of liquid refrigerant.
WARNING!
The gases produced by evaporation of
CO
2
or LN
2
are non-poisonous but displace the
oxygen in a confined space and can cause
asphyxiation.
Do not store the cylinders in subsurface
or enclosed areas
.
CAUTION!
When closing the cylinder valve, make
sure that the injection solenoid is energized to allow all
the liquid to bleed off instead of being trapped in the
supply tubing. Failure to do this results in activation of
the pressure relief device, which could damage the
freezer and requires replacing if it is activated.
CAUTION!
For chest and upright models ordered
with factory installed built-in backup systems, the flow
of liquid CO
2
or LN
2
will be discontinued if the door or
lid is opened during operation of the backup system.
For units operated with free-standing, field installed
type backup system, the flow of liquid CO
2
or LN
2
will
be discontinued upon door or lid opening
only
if the
switch provided with the free-standing package is
installed on the freezer.
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