Piper Products RCM 121, Use And Maintenance Manual

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4.11 Alarms
fig. 16
fig. 17
fig. 18
fig. 19
4.11.1 High Temperature Alarm
fig. 20
fig. 21
During the positive (negative) preservation phase, if the temperature remains higher than the
P02 (P04), for longer than P07 minutes, and the delay of P06 from the
start of the preservation phase or the end of a defrosting process has expired, a
High Temperature
Alarm is activated.
DISPLAY1 shows an alarm message flashing (fig. 16)
The buzzer (if present) rings for a minute P17 at the most but can be silenced by pressing a key,
when the temperature falls by P01 °C under the alarm threshold, the alarm stops automatically.
4.11.2 Low Temperature alarm
During the positive (negative) preservation phase, if the temperature remains lower than the P03
value (PO5), for longer than P07 minutes, and the delay of P06 from the start of the
preservation phase or the end of a
defrosting process has expired, a Low Temperature Alarm is
activated.
DISPLAY1 shows an alarm message flashing (fig. 17)
The buzzer rings for a minute P17 at the most, but can be silenced by pressing a key, when the
temperature rises by P01 °C above the alarm threshold, the alarm stops automatically.
4.11.3 Door open alarm
If the door is open for over two minutes with a chilling/freezing cycle in progress, the compressor
will shut down and Display1 will show the flashing message as in fig. 18
4.11.4 Pressure switch alarm
When the pressure switch alarm is activated (fig. 19) the chilling cycles currently in progress are
terminated immediately.
4.11.5 Time Overrun Alarm
If the chilling or freezing phase currently in progress do not end within the pre-established time,
Display 1 flashes (fig. 20) .
4.11.6 Power Outage Alarm
If there is a power outage during a chilling cycle, when the machine shuts down it memorizes
only the cycle it was running and the phase it was in at that moment.
The tolerance of chilling times is 10 minutes.
If the power outage is greater than P08 minutes, the buzzer is activated, and Display 1
flashes the alarm message: ‘A L 7’ (fig. 21)
The buzzer (if present) sounds for one minute P17 at the maximum level. However, it can be
silenced by pressing a key. By pressing a key again the indication disappears.