10
Amended: Jan 2014
Double Knock.
Double knock operation is programmed on site installer and is used to prevent unnecessary
evacuation of the site. Two fires are needed from the selected list before the output condition is
satisfied and the output can operate
The operation can be done by address, zone, panel or global. Later versions have included the
opportunity to double knock WITHIN an individual zone (any zone 2 devices)
When selecting the trigger to be by address all the addresses have to be on the same loop and the
limit is sixteen.
When selecting the trigger to be by zone then the limit is sixteen zones, which must be on the same
panel. Selecting by zone means that two different zones will have to be in fire before the output
condition is satisfied.
When selecting the trigger to be global then any two fires on that panel will satisfy the output
condition.
If double knock is required to operate across the network then selecting by panel will allow any two
fires on the selected panels to satisfy the output condition.
NOTE If Double knock is set by zone
– any 2 devices within the same zone will NOT satisfy
the condition.
Coincidence (Dependency type C).
Coincidence is different from double knock in that two fires from the allocate device list are required to
satisfy the output condition but one fire from outside the list will also satisfy the output condition.
This function is similar to double knock in the way that it is set up i.e. by address, by zone and has the
same restrictions on the number of trigger devices.
NOTE If Coincidence is set by zone
– any 2 devices within the same zone will NOT satisfy the
condition.
Weekly Test.
This function allows the user to perform a weekly test single-handed.
Once this function has been selected the panel starts a four-minute timer, when a call point is
activated within these four minutes the panel will operate the sounders and then silence and reset the
system.
Once this has been done the weekly test mode will be cancelled. If no call point is activated within the
four minutes the weekly test mode will be cancelled.
During this test mode the relay outputs controlling plant and equipment shutdown will not
operate, neither will the FRE nor FPE outputs
FRE: Fire Routing Equipment typically used to operate a remote centre communicator.
FPE: Fire protecting Equipment typically used to control fire doors.
Note: If ‘disable all outputs’ is selected, weekly test or walk test will still make the sounders
operate
Sounder Level Test.
This option allows for Db readings to be taken without causing too much disruption to the site
occupants.
Selection of the sounder level test mode turn the sounders on for 15 seconds enabling a reading to be
taken and then turn them off for 30 seconds allowing the engineer to move on to the next area.