4
The following chart indicates the total Combus wire allowed
depending on the capacitance rating of the wire used:
Wires run in parallel also increase Combus capacitance. For
example, when using 20nF wire, the following would be
some of the combinations allowed:
• Four wire runs at 1000'/305m each
• Six wire runs at 666'/203m each
• Eight wire runs at 500'/152m each
• 10 wire runs at 400'/122m each etc…
NOTE: Contact the wire manufacturer for the capacitance
ratings of the wire being used.
PC4204/PC4204CX Power Supply
PC4204/PC4204CX power supply modules are required to
power additional modules and devices when the total cur-
rent from the main panel is insufficient. A PC4204/
PC4204CX should also be used if excessive line loss is
encountered.
PC4204/PC4204CX Current Requirement
AUX
AUX AUX
AUX - 1.0A available for devices connected to the AUX ter-
minal, including devices connected to relay outputs and
modules connected for Combus repower (see 2.5 ‘Combus
Operation and Wiring‘).
Combus Repower
Only Relay 1 on the PC4204/PC4204CX can be used for
Combus repower. The Combus must be wired to the
PC4204/PC4204CX according to the following diagram for
Combus repower:
PC4204
PC4204CX
IMPORTANT NOTE: Do not use any power supply other
than the PC4204/PC4204CX to repower the Combus. In the
event of a power surge or transient, a module may lock up
and cease to communicate with the control panel. If the
panel loses communication with the module, it will ini-
tiate a module reset and will power down the Combus for
five seconds in an attempt to reset the problem module.
After five seconds, the panel will reapply power to the
Combus and the problem module should begin to operate
as intended.
NOTE: If a power supply other than the PC4204/PC4204CX
is used, the Combus repower function will not operate as
intended.
NOTE: New versions of the PC4204/PC4204CX power supply
module have a jumper marked ‘J1’. Ensure that this jumper
is configured for ’Combus Relay’. Otherwise, the power
reset function will not operate. For more information
regarding the PC4204/PC4204CX, please refer to the
PC4204/PC4204CX Installation Instructions.
2.6 Zone Wiring
Zones on the system are wired according to the diagrams
below. Once you have selected which type of zone supervi-
sion you require, you must program the ’Zone Supervision’
section. See 5.1 ‘Zone Supervision‘ for instructions.
NOTE: Fire, LINKS Supervisory, LINKS Answer, AC Delay or
Forced Answer zones always use single EOL supervision,
regardless of the programmed zone supervision.
No End of Line (No EOL)
All No EOL zones are normally closed loops. The zone will
be violated when it is open.
Single End of Line (EOL)
All Single EOL zones have a 5600
Ω
resis-
tor across them. If the zone is shorted or
open, it will be violated. Resistors should
always be placed at the device end of the
wire run.
If programmed as a fire or waterflow
zone, the open zone will generate a trou-
ble condition and the short will generate an alarm.
Double End of Line (DEOL)
All Double EOL zones have two 5600
Ω
resistors across
them. DEOL loops will allow the panel to detect zone
faults, zone tampers, violated zones and restored zones.
Resistors should always be placed at the device end of the
wire run.
NOTE: Only normally closed detection devices can be used
with this type of zone supervision. Only one normally
closed contact can be connected to each zone; multiple
detection devices/ ontacts on one loop are not allowed, the
tamper condition will not be monitored.
2.7 Specialized Zone Wiring
Some zones require wiring configurations unique to the
selected zone type. These zones are listed below. For infor-
Wire Capacitance per
1000'(300m)
TOTAL Combus Wire
Length
15nF 5300'/1616m
20nF 4000'/1220m
25nF 3200'/976m
30nF 2666'/810m
35nF 2280'/693m
40nF 2000'/608m
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