Fire-Lite MS-2 Instruction Manual page 21

Input Circuits
Combination Waterflow/Supervisory Zone
A combination Waterflow/Supervisory circuit allows an FACP to distinguish between an Alarm
switch (waterflow device) and a Supervisory switch (tamper) installed on the same circuit. The
following figure illustrates the wiring of Zone 2 as a Style B (Class B) Waterflow/Supervisory
circuit. Note that only Zone 1 on the MS-2 and Zone 2 on the MS-4 can be configured in this
manner.
Supervisory Switch
(tamper)
Supervisory Switch
(tamper)
1.2 K, ½ watt resistor P/N: 75579
Figure 2.5 Style B Combination Circuit on Zone 2 of the MS-4
Requirements for the Combination Waterflow/Supervisory circuit are as follows:
The Waterflow Alarm Switch(es) must connect to the FACP Initiating Device Circuit before

the In-Line Resistor as shown in Figure 2.5
The Waterflow Supervisory Switch(es) must connect to the FACP Initiating Device Circuit

after the In-Line Resistor as shown in Figure 2.5
Program the FACP Initiating Device Circuit #1 on the MS-2 or Circuit #2 on the MS-4 as a

Combination circuit by placing SW1 DIP switch 8 to the ON position as described in "SW1
DIP Switch Settings" on page 35
Waterflow Alarm Switch activation causes the panel to latch into alarm until the alarm

condition is cleared and the FACP is reset
Supervisory Switch activation causes the panel to track the supervisory condition, that is,

the panel will clear when the supervisory condition is cleared (if FACP is programmed for
Autoresettable Supervisory)
MS-2 & MS-4 Series Manual — P/N 51512:G2 10/18/2011
Class B Initiating Device Circuits (supervised and power-limited)
4.7 K, ½ watt resistor P/N:71252
In-Line-Resistor
Alarm Switch
(waterflow)
Installation
Dummy load all unused
circuits - 4.7 K, ½ watt
resistor (P/N: 71245)
Note: Zones 3 & 4 on
MS-4 only
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