TM206
12 of 35
Issue 1.0
8.2
Connection to extinguishing output
The Extinguishing output is capable of supplying up to 1 Amp for the maximum duration to a solenoid or
3 Amps for 20 milliseconds to an igniting actuator or Metron.
The wiring for solenoids and igniting actuators is different as shown below. Igniting actuators of different
types or from different manufacturers should not be mixed on the same circuit.
8.2.1 Solenoid
wiring
Solenoids must have a resistance of greater than 28 ohms to ensure that the maximum current rating of
the Extinguishing output is not exceeded.
Solenoids should be fitted with a suppression diode to prevent EMF generated by the solenoid when it
de-energises from upsetting the operation of the control panel.
Only polarised solenoids (i.e. solenoids fitted with an internal polarising diode) should be used.
Example of wiring a solenoid
8.2.2 Igniting
actuator
wiring
A maximum of four igniting actuators can be wired in series. If only one or two actuators are fitted, a 2R2,
2.5 Watt resistor must be wired in series with them to provide the correct monitoring resistance. The end
of line diode can be discarded when igniting actuators are used.
To guarantee firing under all conditions, the total resistance of actuators, monitoring resistor and cable
should not exceed 7 ohms.
+
-
M
M
M
3 OR 4 ACTUATORS
WIRED IN SERIES
(MAXIMUM OF 4)
EXTING
1 OR 2 ACTUATORS
WIRED IN SERIES
+
-
EXTING
M
M
M
FIT 2R2 2.5W RESISTOR
IN SERIES WITH
ACTUATORS IF ONLY 1 OR
2 ACTUATORS ARE USED
