heatmasterss.com 9
WIRING
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 17-18 for the furnace wiring diagrams.
HYDRONIC LINES
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,
although 1” is most common, 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 ends
for a relaxed connection. Red lines are generally “hot”
while blue are usually “cold”.
FURNACE CONNECTION
Connections to the furnace are clearly marked.
Return (from the building) are the top ports, Supply
(to the building) are the bottom ports. The installation
of isolation valves at both ends of the pump is
recommended as well as a valve at the return line.
This will allow you to shut off water supply if repairs
or additional heating components are added to the
system. Your main power is connected to the junction
box at the back of furnace and should be connected
by a qualified technician.
NOTE: A supply of fresh air is necessary for
combustion and ventilation. Do not block fresh air
intake located at the back of the furnace.
COMBUSTION FAN
SOLENOID
ADJUSTABLE AIR
BLOWER BOX
CIRCULATION PUMP
FURNACE DRAIN VALVE
PUMP PLUG IN AND
FURNACE POWER
SWITCH
LEAD IN POWER
JUNCTION BOX
TIMER
UNDERGROUND
PIPE
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