RDU Mk2 Installation & Programming Manual
Document No: LT0499
Programming Part 2
Page 7-18
8 April 2015
Issue 1.02
R65 = (Z1A + Z2A + Z9A + Z10A) .^ Z3A
R66 = (Z1A + Z2A + Z9A + Z10A) .^ Z11A
Rather than enter both equations in full, it is easier to assign a variable to the common
section of logic and enter three equations as follows:
V2 = Z1A + Z2A + Z9A + Z10A
R65 = V2.^Z3A
R66 = V2.^Z11A
Example 2 - Use of Zone Range and Timers In a Deluge System
A manned area in a building has a high risk of fire but some chance of false operation of a
smoke detector. The area is protected by a solenoid operated deluge system. It is
considered best to run three separate smoke detector circuits through the area, and have a
"voting" system. Also, there is to be one circuit with heat detectors and MCPs, and a circuit
of different coloured MCPs which function as "Inhibit Deluge".
The logic specified by the consultants is that any smoke, heat or MCP operation sounds an
Alert warning tone in the area.
If any 2 of the 3 smoke circuits operate, an Evacuate tone is sounded, and 20 seconds later
the deluge is to operate if no one has operated "Inhibit".
If an MCP or heat detector operates, the Evacuate tone and timer are to start and "Inhibit"
must not prevent the deluge from operating.
Solution:
By assigning the smoke and thermal circuits consecutively, the zone range operand can be
used. Inhibit is assigned a separate zone which is configured as not mapped to MAF,
ANC1, External Bell and Warning System.
The "zones" could be assigned as follows:
Zones Z9, Z10, Z11 are the smoke circuits
Zone Z12 is the heat/MCP circuit
Zone Z13 is the "Inhibit" circuit
Relay R4 switches the "Zone Alert"
Relay R5 switches the "Zone Evacuate"
Relay R6 switches the "Zone Deluge" solenoid.
The appropriate names for zones and relays should be programmed. For thermal detectors
with electronic bases and 15V MCPs, the AZCs should be configured with:
AZC 12 as "Heat", with B3 = Instant Alarm;
AZC 13 as "Manual" with B3 = Instant Alarm.
The logic may be entered using the zone range (ZR) option as follows:
R4 = Z9:12(1)A (i.e., alert on any of zones 9-12 in alarm)
V1 = (Z9:11(2)A.^Z13A)+Z12A (i.e., any two of zones 9-11 in alarm with Zone 13 not in
alarm, or Zone 12 in alarm).
R5 = V1 (evacuate tone)
T1[S20:0]=V1 (stretch timer, input delay 20 sec)
R6 = T1 (deluge)
The variable, V1, is used to start the timer rather than relay R5, so that if someone operates
R5, e.g., by the Test Relay function, there is no chance of it starting the time delay and
initiating the deluge (R6).