Hazard Alarm (Pre-Discharge); 1.5.3 Hazard Release; General Operation - Mircom FX-3500RCU Application Manual

1.5.2 Hazard Alarm (pre-discharge)

The panel enters the Hazard Alarm state when:
• It detects the Hazard area confirming alarm input device. For more information on
confirming alarms see Chapter 1.2 Counting Zone Type.
OR
• For a Single Counting Zone hazard area, a single alarm input device will put the Hazard
Zone into the Hazard Alarm state.
OR
• Manual Release switch is activated.
The releasing process continues as follows:
• Release Delay Timer (RDT) or Manual Release Delay Timer (MRDT) is started.
• Corresponding NAC(s) turns on at Alert rate.

1.5.3 Hazard Release

The panel enters the Hazard Release state when:
• The Release Delay Timer (RDT) or Manual Release Delay Timer (MRDT) expires.
The releasing process continues as follows:
• The correlated releasing circuit is activated.
• Corresponding NAC(s) switch to Evac rate.
1.6

General Operation

• If the Hazard Zone is Idle, activation of a Manual Release Switch starts the Manual
Release Delay Timer (MRDT). The expiration of the MRDT activates the releasing
circuits.
• If the Hazard Zone is active and the configured time for the Manual Release Delay
Timer (MRDT) is less than the time remaining on the Release Delay Timer (RDT), once
the MRDT expires the MRDT activates and release occurs. If the RDT is less than the
MRDT, once the RDT expires the RDT activates and release occurs.
• If the Hazard Zone is activated by the Manual Release Switch, it cannot be aborted.
• If the Hazard Zone is acivated by any other method, any configured abort switches will
operate as described in 1.3 Abort Type.
• System Reset will reset all circuits, including releasing circuits.
!
Attention: When using a system that requires the acitvation of two automatic
detection devices, detector installation spacing must be reduced to 0.7
times the linear spacing in accordance with National FIre Alarm Code,
NFPA 72.
!
Caution: To ensure a Manual Release Switch overrides an Abort Switch, in the FX-
3500RCU configuration software set the Man Rel Priority flag for the Hazard
Zone zone to Yes.
Operating the Panel
5