GAS INTERLOCK

Merlin 2000C

This panel is to be used when the kitchen appliances do not have flame failure devices. Therefore Gas pressure proving is required.

The Merlin 2000C panel combines modern digital gas proving technology with reliable ventilation/ gas interlocking techniques, in one clear concise panel. Combining these features provides initial capital cost savings and less installation time.

Gas Proving may be a requirement for the BS6173: 2001. The standard requires that where flame failure devices are not fitted a gas pressure proving system should be used, to ensure downstream gas line has no leaks and all gas appliances are closed at start up.

If the Merlin 2000C detects there is a drop in pressure due to a appliance being open or a gas leak, within the 20 second start up period, the gas solenoid will close and the panel will show “test fail”. Appliances must be closed and the panel reset and put through another testing procedure. Assuming the system is found to be sound the panel will go to “gas on” and the gas solenoid valve will open.

Ventilation/ gas Interlock ensures that fans are running before the gas solenoid valve can be opened. This is to protect the kitchen users from harmful byproducts of natural gas, and is again is a requirement of BS6173: 2001

Merlin 1500C

This panel is to be used when the kitchen appliances are not equipped with flame failure devices. Therefore Gas proving is not a requirement.

The Merlin 1500C acts as an interlock between the ventilation system and the gas solenoid valve. It ensures the gas solenoid valve cannot be opened until the ventilation system is proven to be operating. The fans can be monitored with either air pressure differential switches or by means of a current monitor. To operate the Merlin 1500C the fans should be turned to the “on” position, once our panel receives a signal to indicate the fans are operational the key on the panel can be turned to the “on” position and this will open the gas solenoid valve. If the fans should fail, the “fan fail” LED on the panel will illuminate and the gas solenoid valve will close.

Operating the system in the above manner will ensure the requirements of BS 6173:2001 are fully met where all the catering equipment has flame failure devices fitted.

Installation for the Merlin 1500C is easy, there is no calibration. Wiring of the system is straightforward using low voltage connections for all airflow switches and remote emergency stops. (See wiring diagrams). A corgi registered plumber would be required to fit the gas solenoid valve.