41
Firebox Door
Principles of the Firebox Door
The firebox door is water cooled to prevent warping of the door. It also acts like
a water jacket, absorbing heat from the fire, and placing that energy into the
water. Being water cooled, the front of the firebox door will never be hotter than
the water. The cold outside atmospheric air is drawn over the warm surface of
the firebox door, by the combustion blowers, which is then warmed and forced
into the firebox as warmed combustion air. This lessens the time needed for
the interior of the firebox to reach that high smoke burning temperature. It is
important that the firebox door seal maintains an airtight seal.
Operation of the Firebox Door
Water from the main waterjacket flows in a loop between the firebox door and the waterjacket by natural
thermal siphoning. Since there is no pump involved, there is very little pressure.
During this process, the water cools the door and the water in
the door is heated.
Refer to Safe Operating Guidelines for further instructions on how to safely open
and close the firebox door or contact your local dealer.
Maintenance / Result
A properly adjusted firebox door will not allow smoke to enter or escape the firebox.
Maintain a tight
seal all around the perimeter of the firebox door at all times. There may be times when the perimeter of the
firebox door will build up with “creosote strings,” especially along the bottom.
To keep the perimeter clean, occasionally scrape down to the steel.
Do not cut,
scrape or disturb the actual
soft, pliable seal. Keep the door correctly adjusted on the hinges so that the pliable seal is being forced against
the firebox ledge. Keep all nuts and bolts on the handle, latch and hinges properly adjusted.
The seal itself consists of a rope in the groove of the firebox door, covered with high temperature silicone.
Failure to manage and maintain the firebox door could result in premature replacement of parts and a buildup
of creosote.
(When replacing the Firebox Door, it is recommended to replace the Door Hoses at this time.)
Removal and Replacement
To remove the firebox door, follow these steps:
1) Turn off power to the combustion air blowers.
2) Ensure that the fire in the firebox is extinguished.
3) Stop the flow of water from the water jacket through the door hoses by pinching the two door hoses
aBsOLuteLY nO Fire in the FireBOX When PerFOrMinG this rePair. DO nOt
PerFOrM this rePair When unit Water teMPerature is unsaFe. aLWaYs Wear PrOPer
PersOnaL PrOtective eQuiPMent When WOrKinG With Water anD cheMicaLs.
200 SSRII Firebox Door
