ADEMCO VISTA-250FBP Setup Guide download pdf (Page 49)

Section 3 - Installing the Control

3-27

The control panel kit you purchased comes with the appropriate transformer. Both transformers have a manually

resettable circuit breaker mounted inside a protective metal enclosure.

Use the following instructions for mounting and wiring the 18VAC secondary winding of either transformer. Use the

instructions provided with the PS24 Power Supply Module to wire the 30VAC winding of the 1451-24 Transformer.

To connect the 1451 transformer to the control, perform the following steps:

Step Action

1 Remove the front cover of the enclosure.

2 Mount the enclosure to the wall near the VISTA-128FBP/VISTA-250FBP control panel. The enclosure has

four mounting holes on its back surface for this purpose.

3 Run 120VAC wiring to the enclosure in conduit. A dedicated circuit must be used.

4 Use wire nuts to splice the 120VAC wires to the transformer’s white and black primary leads.

5 Connect the earth ground post on the back of the enclosure to a good earth ground.

6 Run 16AWG wire in conduit from the enclosure to the control panel.

7 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.

8 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

1 Connect the earth ground post inside the 1451 enclosure to a good earth ground (use grounding methods

specified in the National Electric Code).

2 Use a green nut (supplied) to secure the wire to the ground post. The ground wire should be the only wire

under this nut.

3 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

ground systems.

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ADEMCO VISTA-250FBP Setup Guide Page 49