GROUP SCS EV-301 - EV-HE077 Commands and Gap Ventilation

SCS_BA_EV-301_601_EN_12 groupscs.co.uk Date: 31.05.2023
Issue: 1.2 / 06.2023 info@groupscs.co.uk
Page 17
EV Mode Functions
A manual reset command is triggered by pressing the
EV-HE077 override CLOSE (RESET) or the onboard RESET
button for > 5 seconds. A reset is also be triggered when a
Databus Reset command is received.
The automatic reset function can be set by switching on
switch SW1 – 6.
A reset is automatically triggered when all the reset conditions
are met following an alarm condition:
● With a smoke detector FAS1 input reset the automatic
reset function will trigger after 30 minutes.
● With a re alarm FAS2 input reset the automatic reset
function will trigger immediately.
A reset function switches o󰀨 the power to FAS1 – B2 &
FAS2 – B3 terminals for 3 seconds to reset smoke detectors.
If the smoke detector fails to reset the system will retrigger
an FAS alarm.
When the daily ventilation function is set to Continuous Close
the vent output will automatically CLOSE after an alarm reset.
When the daily ventilation function is set to Dead-man Close
the vent output will remain open after an alarm reset. The vent
must be manually closed by one of the following commands:
● Press and hold the EV-HE077 CLOSE (Reset) button until
vent closed
● Daily close Input Z held on until vent closed
● Databus DailyClose command held on until vent closed
7.8. EV-HE077 Commands
The local EV-HE077 override buttons provide override &
reset commands which the Master panel monitors and res-
ponds to. The commands monitored are:
● Momentary pressing the OPEN (BOOST) button for > 0.5
seconds triggers an override open command
● Momentary pressing the CLOSE (RESET) button for > 0.5
seconds triggers an override close command
● Hold the CLOSE (RESET) button for > 5 seconds triggers
a reset command
● Press the OPEN (BOOST) button momentary for
1 - 4 seconds whilst the zone vent is open and the
fans are running to boost the fans to the reghting
speed. Press again to toggle back to means of
escape speed. Only applicable for mechanical smoke
shafts systems congured for reghting application.
Not applicable for head of stair switches.
Only one override / reset command shall be present at a time
and the last command will take priority.
7.9. Gap Ventilation
Gap ventilation partially opens the vent by limiting the open
stroke by a timer. The open output power is switched on only
for the programmed time following a daily ventilation open
command. The dead-man open function is disabled in this
mode. The timer is adjusted by the read / write dailytime
register set in seconds. When set to zero the daily ventilation
function is disabled (continuous open time).