Standard air-conditioning units
Carel Cod. +030221421 – Rel. 1.2 – April, 11, 2003
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7.0 ALARMS
The alarms managed by the program safeguard soundness of the connected devices and provide signals in case the control parameters have
exceeded the normal values or the board is faulty. The alarms originate from alarm digital inputs, probes or board. Their effect ranges from the
simple block signalling of one or more devices to the air-conditioning unit stop. Many alarms are subject to programmable delay times.
When an alarm state is identified, the following signals occur:
• the buzzer incorporated into the external terminal (not provided for on the built-in terminal) turns on
• the red LED under button ALARM turns on
• abbreviation AL starts blinking on the Menu screen
Pushing button Alarm, the buzzer switches off and the alarm screen is displayed. If more alarms are active, the screen of the first alarm is
displayed; the other alarms can be displayed by using the arrow buttons. If other buttons are pressed, the alarm screens are left but they keep
stored and are displayed again whenever the Alarm button is pressed.
To rearm the alarms and delete the message manually, simply move the cursor on the alarm screens and push button Alarm again; if the alarm
causes have disappeared (digital inputs rearmed, temperature within the normal values, etc…), the screens disappear, the red led switches off
and message “NO ALARM ACTIVE” is displayed. If the cause of one or more alarms is still active, the disabled alarms only disappear,
whereas the other alarms keep displayed and the buzzer and the red led switch on again.
Alarms are divided into two categories: manually-rearmed alarms or automatically-rearmed alarms.
The manually-rearmed alarms require alarm screen deleting (as described above) to restart the devices or the air-conditioning unit. The
automatically-rearmed alarms unlock the device or restart the air-conditioning unit after the cause has disappeared, but the alarm screen keeps
stored in the memory.
7.1 ALARM RELAYS
The medium boards provide a relay for the serious alarms and another relay for the non-serious alarms. The small boards include all alarms in
the only available relay.
The non-serious alarm relay is closed in case of any type of alarm; the serious alarm relay is closed in case of serious alarms only. Each
managed alarm may be identified as serious or non-serious, consequently allowing to determine which relay shall be enabled. The delay time
can be determined for both relays before closing.
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