| | |  | CCTV Monitors | Home » » » 4229 - Ademco 8 Zone Expander with Relays | | | | | | | Description: | | Wired Zone Expander/Relay Board. Provides 8 end-of-line supervised zones and 2 on-board programmable form C relays | | | Product Details: | | | Product Weight:
| 1.0 pounds | | Average Customer Rating:
|  based on 1 reviews |
| | | | Customer Reviews: | |
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Why use the relay 4229 expander over the non-relay equipped unitNov 22, 2010
By HMMWV
"God, Country, Corps"
People often ask why they would need a relay on a zone expander and the reason is simple. If you are monitoring only burg inputs (doors, PIR detectors, window switches) you do not need a relay. But put just ONE wired smoke alarm on the expander and you need to interrupt voltage to the alarm if it goes off to clear and reset the zone (the fire department will insist on this should a detector trigger). All wired detectors are setup to clear their status by interrupting power, which is done here with the relay under command from your panel on the "clear smoke alarm" signal. If your home has 5 bedrooms, a garage, and a living area you could have 7 smoke detectors to meet code. This expansion unit gives you a clean method to include those smoke sensors without a problem when one is activated.
Hint: Wire the power lead to the smokes through the normally closed position on the relay to save power and interrupt it from the panel when clearing the smoke alarms. The relays draw an extra 70mA when energized.
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