Topics:

·        - Zone types that cause check

·        - High resistance sensing

·        - Double balanced zone configuration

·        - Hardwire Zone Short-detection

- Zone types that cause check

Zone types 05 (trouble) and 09(fire) can cause a CHECK if the zone is faulted.

If this is the case, strap the zone with a resistor and see if it clears. It is likely a field wiring issue.

Configurable zone types (90/91) on the Vista-15P and 20P may go into trouble based on their programming.

- High resistance sensing

The Vista-15, and 20se series controls can sense if a zone has a higher resistance than it should.

The panel zone should be 2000 Ohms (+/- 300 Ohms).

If the loop resistance rises above 2300 Ohms, a trouble condition is annunciated.

A bad splice in the field wiring often causes this condition.

If this is the case, strap the zone with a resistor and see if it clears. It is likely a field wiring issue.

- Double balanced zone configuration

Documented as a feature of the Vista-20P, This feature basically creates a high resistance trouble if a tamper switch is violated.

- Hardwire Zone Short-detection

This feature is an option only on the Vista-15 (not the 15P or any version of the 20)

If *30 = 1, a short on a hardwire burg zone is treated as a trouble condition.