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> Gentex 8240P photoelectric 4WIRE smoke detector w heat
Gentex 8240P photoelectric 4WIRE smoke detector w heat
MODEL#8240P PHOTOELECTRIC 4 WIRE SMOKE DETECTOR
24 VDC photoelectric smoke detector, Reverse/Local 90dBA Piezo
The 8240P is a 4-wire detectors equipped with integral piezo-electric signals. These internal signals are activated upon detection of smoke at the detector of alarm or upon reversal of polarity of the detector power. This application enables the integral piezo to operate either as a local evacuation signal or as a system signalling device.
The most likely application would be an 8240PY or 8240PHY. The detector would be used as a local smoke detector with the alarm contacts
notconnected to the alarm loop of the control panel. In this manner, upon detection of smoke, the piezo would sound at the detector of alarm and restore to normal after smoke clears.
If equipped with the isolated thermal (H option), the thermal contact would be connected to the alarm loop. If any device connected to the alarm loop is activated the alarm panel is put into an alarm condition which activates the polarity reversal relay which activates the piezo signals in all connected 8240PY/8240PHY smoke detectors. The piezo would continue to sound until the panel is reset or until the alarm/signal silence is manually operated at the panel.
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