38
Rev. 05/2020
CHAPTER 12
WATER JACKET
Principles of the Water Jacket
HTF within the water jacket absorbs heat produced in the firebox. The heated HTF is used
to transfer heat from the HEATMOR™ into the building needing heat. The water jacket and
the firebox are one welded component and can be replaced.
Maintenance
Keep the proper mixture of HTF.
Supply Line and Return Line Threaded Connectors
Principles
The HEATMOR™ furnace is designed to draw the supply (hot) HTF from the bottom of
the water jacket. This may seem irregular (people know hot water rises), but this method
mixes the HTF in the water jacket better and often extends pump life. The return (cooler)
HTF connects to the, upper, rear spud of the HEATMOR™. A circulator (pump) moves the
HTF at approximately three to 10 gallons per minute, through both lines under very little
pressure (3 psi).
Always attach a BRASS fitting into the STAINLESS STEEL spud to
prevent galvanic corrosion.
Relief Vent Pipe with Elbow
Principles
The relief vent pipe is connected to the top of the
water jacket. When the HTF within the water jacket
is heated it expands, the HTF will expand into the
bladder, instead of out onto the roof.
Relief Vent Pipe with Elbow