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Installation & Operation Manual
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.
WATER VALVE 100-240vac electrical power output from the [VALVE OUT] terminal using a 3-core cable to a water
solenoid valve, which can shut the water supply on alarm status.
WATER LEAK MONITOR (Zones 1 – 4) 24vdc power supply to Water Leak Monitors are wired to [DETECTOR
ZONE] terminals. For more information, see section: Wiring your detector.
GENERAL ALARM An open/close input for external alarm (i.e. remote emergency shut-off buttons).
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 water supply 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.
Wiring your Detector
Power is supplied to a WLM via the [PANEL] terminal [+ / -] and using the WLMZ4 panel [DETECTION ZONE]
terminal.
If you are using a WLMZ4 panel you will need to use the detector [C/L] terminal as an alarm relay.
BMS Switch
The WLMZ4 can be integrated with a BMS to make or break a circuit on water supply on/off, (valve open or valve
closed). This will tell the BMS whether or not electrical power is being sent to the solenoid. There is a dip-switch
located on the WLMZ4 circuit board labelled [BMS]. This is factory set to 'OFF' position which signals the BMS on
water supply on/water supply off. When switched to 'ON', the WLMZ4 will only signal the BMS on an alarm, i.e.
water leak detected, EM Stop pressed, etc.
BMS SWITCH
OFF
ON
Rev: 2 02-24
BMS SIGNAL
Water supply on or off only.
Error condition i.e. water leak detected, emergency stop pressed.
Merlin WLDZ4
5
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