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Alarm, Safety, and Auto-diagnostic Features
This unit is equipped with all features listed in Table 2. Additionally, it also has auto-diagnostic features.
Operation
Table 2, Alarm and Safety Features
Alarm or Safety
High
Temperature
Low
Temperature
Loss of power
Door ajar
Abnormal
sensor
performance
Refrigerator Behaviors
Either upper sensor or
lower sensor reaches
10 and warmer
Either upper sensor or
lower sensor is below
2
The unit lost power or
the power switch is off.
Outer door is slightly
open or wide open.
Upper temperature
sensor circuit shorts
or opens.
Lower temperature
sensor circuit shorts
or opens.
Defrost sensor circuit
shorts or opens.
Over temperature
sensor circuit shorts or
opens.
Rechargeable battery
has low voltage, or
there is no circuit .
Alarm Methods and
Indication
Alarm light flashes
Alarm light flashes
Temperature display
shows for 60 seconds,
and stops showing
for 120 seconds. The
process repeats until
power is on again.
After a 10-minute
delay, alarm light
flashes.
Alarm light flashes.
Temperature display
shows “E1”.
Alarm light flashes.
Temperature
display shows
“E2”.
Alarm light flashes.
Temperature
display shows
“E3”.
Alarm light flashes.
Temperature display
shows “E4”.
Alarm light stays
on. Display shows
temperature
normally.
Buzzer Alarm
Buzzer alarm sounds
Buzzer alarm sounds
After the time of
losing power exceeds
72 hours, buzzer
alarm sounds.
After a 10-minute
delay, buzzer alarm
sounds.
Buzzer alarm sounds.
Buzzer alarm sounds.
Buzzer alarm sounds.
Buzzer alarm sounds.
Operation
Note: Remote alarm contact and buzzer alarm work together. When the refrigerator is in alarm mode,
the remote alarm contact can be disconnected by pushing the buzzer button. If the unit is in the alarm
mode due to loss of power, the remote alarm contact remains in the alarm mode. This condition persists
until the power is resumed. All alarms will automatically stop once the problem is corrected. If the alarm
condition is not corrected within 30 minutes, the buzzer alarm and remote alarm contact are activated
again. In the case of losing power, a fully charged battery can support the alarm system for 72 hours.
For a newly started refrigerator or a refrigerator that has been unplugged for a long time, you should
make sure the battery is fully charged. This charging process can take up to two days. When the battery
discharges, the remote alarm contact continues to function.
Procedure to Test the Alarm System
Push the “Alarm Test” button once. The alarm buzzer sounds three consecutive times in 1 Hz frequency.
At the same time, the alarm light also flashes three consecutive times and the remote alarm contact
opens and closes for three times. The alarm system functions properly.
This blood bank refrigerator should be cared for by dedicated personnel. The operational status of
the unit should be inspected and recorded daily. If the temperature runs toward over-temperature
condition, you should transfer the stored products to another refrigerator. The products are only
allowed back in the original unit only when operating errors are corrected.
Trouble Shooting Guide
Solution
1.Inspect fuse blocks.
2.Check that the cord is securely plugged into the power outlet.
3.Inspect for problems associated with control wires.
4.Make sure the voltage is not too low.
1.Inspect to see if the unit is overloaded or products with warm temperature
have been loaded into the unit.
2.Make sure there is an air gap between products.
3.Check to make sure the unit is not in direct sunlight or subject to any heat
radiation.
4.Investigate to see if there have been frequent door openings.
5.Investigate to see if the environment temperature is too high.
6.Inspect air channels to see if they are blocked.
7.Check the condenser air filter to see if it is clogged with dirt.
1.Make sure the unit is placed on a level floor.
2.Make sure any part of the unit does not touch a wall or any object.
1.If warm blood products are just loaded to the unit, allow ample time for the
temperature to recover. The alarm signal cancels when the temperature
recovers to normal level.
2.Inspect the door to make sure it is shut properly. Door ajar alarm can sound
if the door is slightly opened.
3.There might be insufficient power supply. Let it run for some time to recover.
4.Check the temperature of the unit to see if it is in over-temperature condition.
Problem
Unit stops operating.
Unit's refrigeration is
not effective.
Temperature tends to
operate out of range.
The unit is too noisy.
Alarm light flashes,
alarm buzzer sounds.