Installation & Operation Manual Merlin GDP4
Rev: 11 03-21
5
Internal Board Overview
1.
100-240VAC Mains power Input
2.
100-240VAC Gas Solenoid Valve Output.
3.
24VDC Gas detector power supply (Zone 1)
4.
24VDC Gas detector power supply (zone 2)
5.
24VDC Gas detector power supply (zone 3)
6.
24VDC Gas detector power supply (zone 4)
7.
Remote emergency stop buttons
8.
Heat Sensor: Fusible Links
9.
Fire panel connection
10.
BMS output contacts.
11.
24VDC Sounder/ Strobe alarm
12.
Switch - BMS Selection & Auto Reset
13.
Switch - Zone 1, 2, 3 & 4 enable/disable
Note: Terminal blocks are plug/socket type and may be removed to ease wiring.
Be careful when creating access for cables – Damage to circuit boards will void any warranty!
Detectors are sold separately and shipped pre-calibrated and configured!
Board Connections Overview
POWER/LINE IN 100-240vac mains power is supplied to the [POWER/LINE IN] connector using a 3-core cable fused
at 3A. On connecting the mains supply to the panel the power LED indicator will light up – this is located on the
front.
GAS VALVE 100-240vac electrical power output from the [VALVE OUT] terminal using a 3-core cable to a gas
solenoid valve, which can shut the gas supply on alarm status.
GAS DETECTOR (Zones 1 – 4) 24vdc power supply to gas detectors are wired to [GAS DETECTOR ZONE]
terminals. For more information, see section: Wiring your detector.
EM REMOTE An open/close switch for remote emergency shut-off buttons detailed on the circuit board as [EM
STOP].
HEAT SENSOR An open/close switch for heat sensors/ thermal links detailed as [HEAT SENSOR].
FIRE PANEL An open/close switch for fire alarms detailed on the circuit board as [FIRE PANEL].
BMS OUTPUT Connections are available on the board for Building Management Systems. These are volt free
connections. This is a relay that changes state in alarm or when the gas is on/off and used in conjunction with the
24vdc output and other external relays that affect other devices and controls such as purge fans and audible alarms
etc.
SOUNDER-STROBE 24vdc output for an external sounder alarm/ strobe lighting to activate on alarm.
