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Installation & Operation Manual

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.

N/O not used.

If gas is detected, the circuit is opened, disabling the appliance.

Multiple appliance limit switches can be wired in series.

Adaptable Outputs

The device can be used to effect external relays and contactors to disable multiple appliances

when a fault condition is detected. Multi-pole relays can interrupt power to electrical circuits

controlling boiler, valves and pumps.

Low voltage wiring is to be inserted into the external limit circuit of a gas appliance.

The diagram shows a 120VAC general purpose primary coil with two sets of switches, each with

Normally Open (NO) and Normally Closed (NC) contacts.

These contacts are rated for up to 12A AFL. They can be used to break either a low or line volt

limit circuits or completely remove power to an appliance.

Rev: 11 08-20

To connect both BMS terminals to the safety limit

circuit of an appliance - wire in series as per the

following diagram.

Mini Merlin