50
Connecting the Transformer
NOTE: Upon a total power failure, the control unit will ignore and not transmit alarm supervisory information for a
stabilization period of 120 seconds following restoration of power. Within 60 seconds at the end of the stabilization
period, the control unit shall initiate the transmission of a power restoration signal code. If this report code is enabled
(see report code programming in the Programming Guide), this is the report that will be sent.
To connect the 1451 transformer to the control, perform the following steps:
Step Action
Remove the front cover of the enclosure.
Mount the enclosure to the wall near the VISTA-128FBPT/VISTA-250FBPT control panel. The enclosure has
four mounting holes on its back surface for this purpose.
Run 120VAC wiring to the enclosure in conduit.
A dedicated circuit must be used.
Use wire nuts to splice the 120VAC wires to the transformer’s white and black primary leads.
Connect the earth ground post on the back of the enclosure to a good earth ground.
Run 16AWG wire in conduit from the enclosure to the control panel.
Use wire nuts to splice the transformer blue 18VAC secondary leads to the 16AWG wire. Connect the 16AWG
wire at the control panel to terminals 1 and 2.
Replace the front cover of the enclosure and fasten it with the screws supplied.
• Use wires having insulation rated for at least 90°C operation and suitable for non-power limited applications.
• Use care to keep 18VAC wiring separated from all other wiring inside the control panel’s enclosure. This must
be done by running non-power-
limited 18VAC wiring into the control panel’s enclosure via one of the knockouts
on the left-hand side, and then tie-wrapping these wires to the tie-wrap loops located near the knockout.
Earth Ground Connections
In order for the lightning transient protective devices in this product to be effective, the designated earth ground
terminal (terminal 30) must be terminated in a good earth ground. Recommended wire gauge for the ground connection
is #16 AWG, run no farther than 30 feet.
The panel requires the earth ground connection for its lightning transient protection devices and in order to detect
Ground Fault conditions.
To connect the earth ground, perform the following steps:
Step Action
Connect the earth ground post inside the 1451 enclosure to a good earth ground (use grounding methods
specified in the National Electric Code).
Use a green nut (supplied) to secure the wire to the ground post. The ground wire should be the only wire
under this nut.
Run a 16AWG wire from the ground post to the panel’s earth ground terminal (30). Use a second green nut
(supplied) to secure this wire to the ground post.
This connection avoids ground loops that may occur when the 1451 and panel are connected to different earth
Determining the Control’s Power Supply Load
In the event of an AC power loss the VISTA-128FBPT/VISTA-250FBPT and the Commercial Fire Listed 24VDC Power
Supply must be supported by backup, rechargeable batteries. When the system is used without a Commercial Fire
Listed 24VDC Power Supply, a 12VDC, 12AH to 34.4AH battery must be connected the control panel.
U
For ULC Commercial Fire Installations, only the 34.4AH (2 x 17.2AH) batteries have been evaluated.
For ULC Commercial Fire Installations, the batteries’ capacity must be sized for 24-hour Standby followed by
If a Commercial Fire Listed 24VDC Power Supply is used, refer to its Installation Instructions for the appropriate
backup battery requirements.
To Next Page
Loading...
