Installation & Operation Manual
Mini Merlin
Rev: 11 09-20
9
Appliance Limit Circuit
The device can be used to directly shut down
a gas appliance when a fault condition is
detected (gas leak), by wiring the normally
closed (NC) and common (COM) terminals of
one BMS into the low voltage safety limit circuit
of the appliance.
To connect both BMS terminals to the safety limit
circuit of an appliance - wire in series as per the
following diagram.
N/O not used.
If gas is detected, the circuit is opened, disabling the appliance.
Multiple appliance limit switches can be wired in series.
Remote Shut-Off Connections
Your mini merlin can be integrated with remote devices with an open /close circuit via the
Remote Shut-Off volt free switch terminal.
This terminal has a factory fitted link installed.
This terminal is normally closed and will alarm when energised open - isolating the gas supply.
When using this input, only the mains utility output shall de-
energize. If you are using the CO or NG relay to shut down a
boilers external limit circuit you will need to wire the remote
panic in series with the relay output.
X-Cel House, Chrysalis Way, Langley Bridge,
Eastwood, Nottinghamshire NG16 3RY
+44 (0) 1773 534555
[email protected]
dmsltd.com