EVCO EPK4BHQ1AH Installer manual - Manual (Page 97)

EVCO S.p.A. c-pro 3 NODE kilo AHU | Application manual ver. 1.0
page 97 of 114
or disconnected which the sensor is dependent
AL28 I/O configuration error Auto Shuts down all devices -
AL29 RTC Alarm broken or discharged A/M
Inhibits management of the
time zone
-
AL30 External air damper end run A/M Shuts down all devices Configurable
A/M: Automatic or Manual alarm (set from parameter)
(*¹) To re-arm alarms connected to the hours of operation you need only reset the hours on the device to zero.
(*²) These alarms cause the unit to shutdown bringing it to the status OFF from alarm
7.2.1 Air flow switch alarm
The flow meter can be managed after the initial Start-up phase of the unit and after the Flow meter delay from reset
PA28: once this time elapses, if the contact indicates lack of flow, the alarm will be raised immediately.
During normal operation the flow sensor is continuously monitored: if the contact indicates lack of flow for a period
greater than that at parameter PA29 the alarm will be raised immediately.
The flow meter alarm is restored manually; activation requires the shutdown of the unit bringing it to the state of
Alarm OFF).
7.2.2 Anti-freeze alarm
The method used to enable the alarm is configurable with parameter PA35:
PA35=0: alarm disabled
PA35=1: alarm at digital input
7.3 Alarm relay
The program provides the possibility to manage a relay for a configurable alarm. For each type of alarm there is a
parameter that permits you to choose whether that particular alarm must be signalled on the alarm relay. Additional
alarms can be addressed at relay. Using the relative parameter (PH60) it is possible to define the polarity (NO, or NC)
of the digital output of the alarm.
Unit
ON
OFF
Flow
ON
ON
Alarm
PA28 PA29 P