Furnace Foundation; Trench - Heatmaster MF Series Operation And Maintenance Manual

FURNACE FOUNDATION

Inspect the ground conditions that you intend to install
your furnace on. If the area is unstable or has a history
of staying wet you may have to improve the soil with
gravel as well as raise the level of furnace placement.
A cement pad of 4-6" in thickness should be used.
The furnace in most cases can be placed on 4 cement
blocks not less than 6" wide x 10" long and 3" thick.
The furnace should never be installed on a combustible
Never allow combustible material to accumulate on the
furnace foundation.
Do not install on a combustible base
Find the footprint of the furnace you have purchased
so the legs will stand on the center of the blocks. Cement
pads should be a little bigger than the actual furnace, with
about a 4' extra length front and back so you have a solid
working area.
and place your blocks

TRENCH

SteelTech Inc recommends the trench to be 24" to 36"
deep and wide enough to install your water lines. Take
into consideration soil conditions as rocky soil conditions
can cause the casing of the pipe to be damaged and
trench with sand.
If possible, have a gradual slope in your trench to allow
drainage away from your lines and out of trench bottom.
Most insulated underground pipe has room for electrical
wire in it. If it does not, place electrical supply in bottom
of trench and cover with 6 inches of dirt. A minimum of
R8 insulation value is recommended and a water tight
vapor barrier such as PVC pipe or drain tile to encase your
insulation is a must.
NOTE: It is recommended that only high quality, well
insulated lines are used. Poor quality
you determine the best line to purchase.
NOTE: If you are installing your water lines under an area
where vehicles will cross, you should increase your depth
of the trench and use a schedule pipe over your lines to
reduce the pressure generated on the lines.