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WATER JACKET
Water Jacket
Principles of the Water Jacket
Water within the water jacket absorbs heat produced in the rebox. The heated water is
used to transfer heat from the HEATMOR™ into the building needing heat. The water jack-
et and the rebox are one welded component and can be replaced.
Maintenance
Keep the proper concentration of water treatment in the water and keep the water jacket full
of water.
Supply Line and Return Line Threaded Connectors
Principles
The HEATMOR™ furnace is designed to draw the supply (hot) water from the bottom of the
water jacket. This may seem irregular (people know hot water rises), but this method mixes
the water in the water jacket better and often extends pump life. The return (cooler) water
connects to the, upper, rear spud of the HEATMOR™. A circulator (pump) moves the water
at approximately 10 to 15 gallons per minute, through both lines under very little pressure
(3 psi). Always attach a BRASS tting into the STAINLESS STEEL spud to prevent
galvanic corrosion.
Relief Vent Pipe and Pop-off Ball (if equipped)
Principles
The relief vent pipe is connected to the top of
the water jacket. The pop-off ball sits into the
relief vent pipe, putting a pressure restriction
on the total water jacket. When the water
within the water jacket is heated it expands.
Because of the restriction of the pop-off ball
on the relief vent pipe, the water will expand
into the bladder, instead of out onto the roof.
Any time there is a buildup of more than two
to three psi, the pop-off ball will lift up and re-
lease the pressure, maintaining a completely
safe situation.
DO NOT permanently obstruct the relief vent pipe. This could
cause water jacket or rebox damage if pressure builds.
Relief Vent and Pop-off Ball
Chapter 11
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