Hydronic Lines; Furnace Connection - Heatmaster C Series Operation And Maintenance Manual

WIRING
INTERIOR CONNECTIONS (continued)
When circulation is reduced because of an electrical
All wiring must conform to local codes. Use an
power failure the installation of a hot-water
electrical wire rated and approved for underground
circulation loop that will dissipate at least 10% of the
installations. This wiring can be placed in the same
estimated rated heat output of the solid-fuel boiler is
trench below the water lines. It is recommended that
recommended with the following guidelines:
a qualified technician be present when installing the
electrical portion of the hook-up.
• The loop can only be made inoperative by a
deliberate manual action.
See Pages 17-18 for the furnace wiring diagrams.
• The design parameters for sizing shall be a pipe
size > 3/4 inch (18 mm), room temperature of 65°
F (18° C), and mean water temperature of 180° F
(82° C).
• The loop be positioned above the boiler, with
features that promote natural thermal circulation of
the water.
The piping used in the system should not cause any

FURNACE CONNECTION

restrictions that could create excessive pressure in the
Connections to the furnace are clearly marked.
system. Eg. Reducing from 1" pipe to ½" pipe
Return (from the building) are the top ports, Supply
Flat Plate Exchanger For Pressurized
(to the building) are the bottom ports. The installation
Systems
of isolation valves at both ends of the pump is
Flat plate exchanger systems that are used with
recommended as well as a valve at the return line.
pressurized systems such as in floor heating or hot
This will allow you to shut off water supply if repairs
water baseboard systems help to heat the water
going in to the pressurized system while keeping the
two systems separate. Because an outdoor furnace
is an open system (not pressurized) and the system
tied in to in this type of application is pressurized it
allows both systems to stay the same while being
operational.
The water supplied by the outdoor furnace will heat
the water in the pressurized system while the present
heat source in the pressurized system (such as a
COMBUSTION FAN
boiler) can be used as a back up heat source in case
of emergency or need for additional heat.
Domestic Hot Water
SOLENOID
Flat plate exchanger systems used to pre-heat
domestic water tanks are generally easier to install,
more efficient and more reactive to hot water FURNACE DRAIN VALVE
demands then tube and shell (sidearm) systems. They
are mounted on the supply line and pre-heat the
water going in to the hot water tank.

HYDRONIC LINES

Forced Air Furnace (Water-To-Air Exchanger)
The water-to-air heat exchanger must be mounted so
Hydronic lines (hot water heating lines) whenever
that air blows through the fins (coils). The exchanger
buried or encased in cement should not be spliced.
should be mounted below the A/C coil if possible.
Take the necessary steps to ensure they stay dry. This
The exchanger should be sized to fit existing duct
ensures that minimal heat loss occurs. Supply and
work and should produce about as many BTU's as
return lines should be a minimum of ¾" diameter,
the existing heat source. An exchanger that produces
although 1" is most common, and have a rating of
too many BTU's will result in uneven heat and the fan
100 PSI capacity at 180 degrees Fahrenheit. This pipe
stopping too quickly while a heat exchanger that is
should be listed for potable water.
undersized will not produced the necessary BTU's.
Hint: Mark your feed and return lines prior to covering
On systems with Air Conditioning it is very important
and allow enough pipe above ground at both ends
to not restrict airflow as it will cause the freon coil to
for a relaxed connection. Red lines are generally "hot"
freeze up. Using standard outdoor furnace 3 row coils,
while blue are usually "cold".
a minimum of 80 sq. in. of coil should be used per
ton of cooling. Exchangers can be mounted in cold
air returns but greater care must be taken as heat
or additional heating components are added to the
from the exchanger can interfere with the air handler
system. Your main power is connected to the junction
controls and/or sensors.
box at the back of furnace and should be connected
It is important that the warm-air supply-duct system be
by a qualified technician.
constructed of metal in accordance with NFPA 90B-
NOTE: A supply of fresh air is necessary for
1993, 2-1.1 if the outlet-air temperature of a central
combustion and ventilation. Do not block fresh air
furnace exceeds 250° F (121° C) when it is tested in
intake located at the back of the furnace.
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.
Forced air furnace with water-to-air exchanger
PUMP PLUG IN AND
FURNACE POWER
SWITCH
LEAD IN POWER
JUNCTION BOX
TIMER
CIRCULATION PUMP
ADJUSTABLE AIR
BLOWER BOX
UNDERGROUND
PIPE
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