Specifications

Beech Ovens Page 25 28/07/2011 (C)
RND-REC-RGO Manual (R1) Confidential and Proprietary
Beech Ovens supply a flue performance monitoring system that will fulfil the
requirement of this Standard. The system consists of an Interlock Thermocouple, a
mounting gland nut and a temperature controller, most of which are assembled into the
Gas control cabinet. The operation of this system is to monitor the temperature of the
exhaust gas at the top of the flue spigot above the oven mouth.
During normal operation with the flue fan operating, this area of the exhaust is around
120-170°C. This temperature is caused by a mixture of hot gases from the oven and
cool gases (air), from the area in front of the oven, being draw together into the exhaust
spigot.
Should the power for the system fail or deteriorate to an extent where there may be
spillage of combustion product from the oven, the amount of cool air from the kitchen
area being drawn into the flue spigot will decrease and the temperature in this spigot
area will rapidly increase.
The interlock temperature controller is preset to 200°C. When this temperature is found
in the flue spigot by the thermocouple probe, the system controller will interrupt the
power supply to the main oven gas system. This will in effect turn off the gas to the oven
burners.
The gas system will automatically relight and resume its pre-programmed operation
when the main control switch on the front of the Gas control cabinet has been reset.
(Turn OFF and turn ON.) Before this is done, to stop repeated cut-outs, the flue system
should be inspected to verify correct operation. (Refer to System Damper Calibration
in this Manual.)
The before mentioned 200°C limit is used, as this temperature is quickly achieved even
when the oven is started from cold and the fan has not been switched on. (In testing,
the Gas system will turn off in less than 2 minutes if this situation occurs)
Once the oven is hot, this interruption time is much less. 200°C is also a good flue
temperature to avoid because of the ability for spontaneous combustion to occur at
temperatures above this value.
The only additional work required outside of normal installation, is to fit the Interlock
Thermocouple probe to the Flue Transition (Adapter) above the oven mouth as
illustrated on the previous page.
NOTE: When coiling the cable to the Thermocouple, be sure not to kink or damage the
cable. The cable is to be routed in a tidy manner using the supplied clips and
cable ties under the oven base ensuring that it is not attached to other cables,
metallic or sharp objects.