21
Section 6 - System Installation
Installing the circulation pump(s) at the outdoor furnace
is recommended, but required if the building being
heated is higher than the outdoor furnace or if there is a
large rise in the water lines between the outdoor furnace
and building (see Fig. 26 and 27). Hot water boils at a
lower temperature when pulled uphill (because it is at
a lower pressure); therefore, hot water must be pushed
uphill to ensure proper circulation.
Fig. 26
If not mounted on the outdoor furnace, the circulation
pump(s) must be mounted 4 to 5 feet (1.2 to 1.5 m)
lower than the top water level in the outdoor furnace
(see Fig. 27).
Fig. 27
4 ft. min.
Pump must be installed
in the hot supply line
and may be located
inside this building
Building to be heated
Water Level
Ground
Level
© 2015 Central Boiler
Shut-Off Valves
Shut-off valves should be installed on both sides of each
pump so if it becomes necessary to repair or replace the
pump, the pump can be isolated.
Filters
A Y-strainer or filter may be installed at the outlet side
of the pump to remove foreign particles which may be
present in the water. Always install Y-strainers with the
cleanout in the lowest position.
Thermostatic Valves
NOTE: A 3/4" thermostatic valve must be installed
on each set of supply and return lines or warranty
can be voided.
NOTE: For additional thermostatic valves, or
for 1-1/4" thermostatic valves, contact your
authorized Central Boiler dealer.
NOTE: The thermostatic valves illustrated
throughout the manual may vary from your
installation. See the installation instructions
provided with the thermostatic valve.
CAUTION
DO NOT operate the outdoor furnace with the
water temperature less than 150˚F (65˚C).
A thermostatic valve must be installed on each set
of supply and return lines in the system to maintain
the outdoor furnace water temperature above 150˚F
(65˚C). Operating the outdoor furnace with the water
temperature less than 150˚F (65˚C) may result in more
condensation in the firebox that can lead to corrosion.
It is recommended that the water temperature setpoint
of the furnace be set to 185˚F (85˚C) to decrease the
likelihood of the water temperature falling to 150˚F
(65˚C). As a result, the outdoor furnace will operate
with a greater efficiency and require less maintenance.
Failure to follow proper operating instructions may
result in furnace damage.
Fig. 28
Ball Valve
Hose Bib
Hot Supply from Pump
on Outdoor Furnace
Return to
Outdoor Furnace
Thermostatic Valve
