Edwards Signaling FireShield 10 Zone - Manual (Page 21)

Installation
FireShield Technical Reference Manual 2.11
Connecting a CTM module
The CTM4.7 City Tie Module is an interface between the
control panel notification appliance circuit and a master box. It
provides off-premises signal transmission for systems that
must comply with NFPA requirements for Auxiliary
Protective Systems. The CTM4.7 activates a local energy fire
alarm box, which provides a 24 Vdc alarm signal (current
limited at 200 mA). The 4.7 K
Ω end of line resistor required
by the NAC is built in to the CTM4.7.
Requirements
When connecting a CTM to the panel, the following hardware
and programming requirements must be met:
• The NAC used must be dedicated to CTM use only
• All alarm zones must be programmed to activate the
dedicated NAC
• The NAC used must not be programmed for Signal
Silence
Specifications
Power: Nominal 24 Vdc @ 200 mA
Municipal box operation: Nominal 24 Vdc
Maximum wiring resistance: 25
Ω
Trip current: 200 mA into 14.5 Ω coil
Maximum current: 300 mA
Standby current: 20 mA
Mounting: Single gang box
Operating environment
Temperature: 32 to 120 °F (0 to 49 °C)
Humidity: 93% RH, noncondensing
The following are wiring diagrams showing how the polarity
switches during an alarm condition.
Panel in normal condition
Notification
appliance circuit
1
1
2
2
CTM4.7
+
+ +
+
_
_
_ _ [1] [2]
Master box
Municipal circuit
Normal condition
[3]
[4]
[5]
Panel in alarm condition
Notification
appliance circuit
1
1
2
2
CTM4.7
+
+
+ +
_
_ _
_
[1] [2]
Master box
Municipal circuit
Alarm condition
[3]
[4]
[5]
Notes
[1] 200 mA into a 14.5 Ω trip coil max., loop resistance = 25 Ω
[2] This circuit is nonpower-limited and is supervised for
grounds and opens, but not shorts
[3] Supervised and power-limited
[4] NAC must be programmed for continuous signal
[5] CTM4.7 must be mounted in the same room as the panel