The precast combustion chamber illustrated in this leaflet is for use on oil and gas fired hot water and central heating boilers. The advantage of this type of combustion are as follows:

1. Combustion chamber sections are set in dry and can be fired on completion of installation in accordance with firing instructions.
2. Due to simplicity of design, installation costs can be considerably reduced by using unskilled labour
3. Shape of construction chamber including radiant angles, ensures better combustion and transfer of heat to boiler waterways.
4. Adequate wall thickness of precast sections gives extra protection and strength, and stability of target wall.
5. Design incorporates low side walls and higher rear wall, to meet with modern oil burner requirements.
6. Precast combustion chamber sections contain lightweight refractory aggregate to obtain quick heat propagation.
7. Replacement of one or more precast sections can be accomplished without disturbing the remainder of the combustion chamber
   

COMBUSTION CHAMBER INSTALLATION INSTRUCTIONS

	PHASE I     (a) Cover base with 3" insulation bricks without using cement. If boiler is mounted on a hollow Blue-brick ring, blocks are laid inside this.     (b) Mix cement and aggregate together with approx. 2 gallons of water. This forms the insulating concrete, part of which is used to tamp round the inside perimeter of the boiler base to seal against air filtration.     (c) Use 3" insulating bricks to build a wall to nipple height at rear boiler, and also to cover mild-steel skirt where applicable. In narrow boilers, 1", 1½" and 2" insulating bricks are used to cover the skirt. Use jointing cement.
	PHASE II (d) Place pre-cast combustion chamber in position dry.(DO NOT USE JOINTING CEMENT TO JOINT PRE-CAST SECTIONS TOGETHER).     (e) Using remainder of insulating concrete from (b), fill between feet of combustion chamber sections to height of toe.
	PHASE III     (f) Use firebricks, backed with insulating bricks and jointed with cement, to build front wall to protect mild-steel plate and accommodate burner quarl, this to be fitted to correct height from floor to centre-line of burner   FIRING INSTRUCTIONS (g) ON INITIAL FIRING, RUN BURNER ONE MINUTE ON, AND TWO MINUTES OFF FIRST HOUR TO ENSURE GRADUAL DRYING OF REFRACTORIES.