Evco EVD MVC Series Applications Manual

EVCO S.p.A. EV3 MVC & EVD MVC | Application manual ver. 2.2c | Code 1443DMVCI224
page 60 of 74
12 SIGNALS AND ALARMS
The alarm signals can be of the following types.
- Automatic: the alarm is reset automatically once the cause of the alarm has disappeared
- Manual: must be reset manually (before resetting the alarms manually, check that the cause of the alarm has been rectified and then
switch the device off and on)
- With a number of signals per hour (resetting is automatic provided the signal counter has not exceeded the parameter specified in the
description of each alarm, after which they must be reset manually; the hourly signal counter is incremented once every 225 seconds).
The table below shows the meaning of the device’s various alarm codes.
Code Label on display Description
AL01 oFFd
Check switch-on by digital input
Indicates that the controller is switched off and is being controlled remotely.
Main results:
- the loads are switched off with the preset timings
AL02 oFFt
Check switch-on by time band
Indicates that controller is switched off by time band regulation.
Main results:
- the loads are switched off with the preset timings
AL03 EA
Cumulative probe alarm
Indicates that one or more of the probes is in alarm mode. Non-configured analogue inputs do
not cause alarms.
Automatic alarm.
Main results:
- the functions linked to the probes in alarm mode are inhibited
AL04 ACoM Communication alarm
AL05 AFro
Antifreeze alarm
The alarm is activated when the value of one of the configured water probes is lower than the
value A15 or if the Coil Water Antifreeze digital input is configured and active; it is deactivated
when the value of all the configured water probes is higher than A15+A16 and the configured
antifreeze digital input is not active.
The alarm is delayed for a period equal to A14 from when the threshold temperature is reached
or the digital input is activated.
Automatic alarm.
Main results:
- the water valves are opened fully
AL06 Atr
Electric coil heater thermal switch alarm
The alarm is activated if the input configured as a heater thermal switch input is active. It is
deactivated if the input is inactive.
Manual alarm.
Main results:
- the electric coil is switched off
- the fans are running at maximum speed
AL07 AHP
High pressure alarm
The alarm is activated if the input configured as a high pressure input is active. It is deactivated if
the input is inactive.
Manual alarm.
Main results:
- the compressor is switched off
- the fans are running at maximum speed

Evco EVD MVC Series Specifications

General

Brand	Evco
Model	EVD MVC Series
Category	Controller
Language	English