Installation & Operation Manual Merlin WLDZ4
Rev: 2 02-24
5
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
BMS SIGNAL
OFF
Water supply on or off only.
ON
Error condition i.e. water leak detected, emergency stop pressed.
