MF Series HeatMaster SS Outdoor Furnaces
www.heatmasterss.com
INTERIOR CONNECTIONS (continued)
INTERIOR CONNECTIONS (continued)
DOMESTIC HOT WATER
DOMESTIC HOT WATER
Flat plate exchanger systems used to pre-heat domestic water tanks are generally easier to install,
more efficient and more reactive to hot water demands then tube and shell systems. They are
mounted on the supply line and use a convection current to heat the water.
FORCED AIR FURNACE (WATER-TO-AIR EXCHANGER)
The water-to-air heat exchanger must be mounted so that air blows through the fins (coils). The
exchanger should be mounted below the A/C coil if possible. The exchanger should be sized to fit
existing duct work and should produce about as many BTU’s as the existing heat source. An
exchanger that produces too many BTU’s will result in uneven heat and the fan stopping too quickly
while a heat exchanger that is undersized will not produced the necessary BTU’s. The heat
exchanger can also be placed into the cold air portion of the duct work but it is not recommended
because some furnaces have an overheat shut off if the fan overheats as a result of blowing hot
instead of cold air.
It is important that the warm-air supply-duct system be constructed of metal in accordance with NFPA
90B-1993, 2-1.1 if the outlet-air temperature of a central furnace exceeds 250° F (121° C) when it is
tested in accordance with the requirements for Simultaneous Firing in 56.4.1 and 56.4.2 of the
standard. It is also important that the plenums installed to the furnaces be constructed of metal in
accordance with NFPA 90B-1993, 2-1.3.
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