Heatmaster MF-3000 Owner's Manual page 9

HeatMaster SS Outdoor Furnaces
SteelTech Inc recommends the trench to be 24" to 36"
deep and wide enough to install your water lines. 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: 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.
All wiring must conform to local codes. Use an electrical wire rated and approved for underground
installations. This wiring can be placed in the same trench below the water lines. It is
recommended that a qualified technician be present when installing the electrical portion of the hook-
up.
See Pages 13-15 for the furnace wiring diagrams.
Hydronic lines (hot water heating lines) whenever buried or encased in cement should not be spliced.
Take the necessary steps to ensure they stay dry. This ensures that minimal heat loss occurs.
Supply and return lines should be a minimum of ¾" diameter and have a rating of 100 PSI capacity at
180 degrees Fahrenheit. This pipe should be listed for potable water.
Hint: Mark your feed and return lines prior to covering and allow enough pipe above ground at both
Hint:
ends for a relaxed connection. Red lines are generally "hot" while blue are usually "cold".
www.heatmasterss.com
TRENCH
TRENCH
HYDRONIC LINES
HYDRONIC LINES
WIRING
WIRING
MF Series
- 5 -