ADEMCO VISTA-20HWse Troubleshooting Guide download pdf (Page 34)

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Section 11. FINAL POWER UP

This section provides information about final power-up procedures and battery size calculations.

Earth Ground Connections

The designated earth ground terminal (25) must be terminated in a good earth

ground for the lightning transient protective devices in this product to be effective.

It also must be grounded to enable the telephone line fault indicator to work

properly. The following are examples of good earth grounds available at most

installations:

Metal Cold Water Pipe: Use a non-corrosive metal strap (copper is

recommended) firmly secured to the pipe to which the ground lead is electrically

connected and secured.

AC Power Outlet Ground: Available from 3-prong, 120VAC, power outlets only.

To test the integrity of the ground terminal, use a three-wire circuit tester with

neon lamp indicators, such as the UL-Listed Ideal Model 61–035, or equivalent,

available at most electrical supply stores.

AC Power-Up

1. Plug the 1321 or 4300 transformer into a 24-hour, uninterrupted 120VAC

outlet.

2. Following power-up, AC, dI (disabled), or Busy Standby (Alpha keypads) or

NOT READY (fixed-word keypads) will be displayed. Also the green

"POWER" LED* on the keypad(s) should light.

* Some keypads are equipped with a "READY" LED in place of a "POWER" LED.

After approximately 1 minute, the initial displays will revert to

DISARMED...READY TO ARM for Alpha keypads, or READY for Fixed-word

keypads (if there are no faulted zones). This 1-minute delay allows PIRs, etc.

to stabilize.

To bypass this delay, press: [#] + [0].

Connecting The Back-Up Battery

In the event of an AC power loss, the Control panel is supported by a back-up,

rechargeable gel cell battery. The minimum battery size recommended is the No.

467 (12V, 4AH) battery. See “Calculating Battery Size Needed” below. The

battery is installed in the control cabinet.

The standby battery is automatically tested every 4 hours, beginning 4 hours

after exiting programming mode. In addition, entry into the test mode will cause a

battery test to be initiated.

Calculating the Battery Size Needed

Determine the total device current draw after filling in the AUXILIARY DEVICE

CURRENT DRAW WORKSHEET on the next page. To this figure add the 100

mA that is drawn by the control panel itself. Then, to determine the battery size

needed, use the following formula:

Total Current Drawn* x Number of hours standby wanted = Battery Ampere/Hours.

* Convert mA figure to decimal Amps (see example).

Example:

If total auxiliary device current drawn is 450 mA, add 100 mA for the

control panel, for a total of 550 mA (0.55 amps); if 24-hour standby is wanted, the

calculation will be:

0.55 mA x 24 hours = 13.2 Ampere/Hour battery needed.

In this example, two 7 Amp/Hr batteries (connected in parallel) must be used.

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ADEMCO VISTA-20HWse Troubleshooting Guide Page 34

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