Vented System Installation - Central Boiler Pallet Burner Dual Fuel Owner's Manual

Vented System Installation

The Pallet Burner Outdoor Wood Furnace may be
connected directly into an existing hot water system,
changing it to an atmospheric vented system.
NOTE: Any changes in the existing boiler and/
or system should be done by a certified installer
in accordance with applicable codes. Be sure
the system water is properly maintained with
Corrosion Inhibitor Plus™ (see Water Quality
and Maintenance section).
The hot supply line from the outdoor furnace can be
connected into the top of the existing boiler and returned
to the outdoor furnace from the bottom of the boiler
(see Fig. 26). Use one pump to continuously circulate
the water from the outdoor furnace through the existing
boiler and back to the outdoor furnace.
CAUTION
The outdoor furnace must NEVER be pressurized.
The vent cap must always be loose. Do not
extend the vent pipe. The outdoor furnace will be
damaged if it is pressurized.
When the existing system is connected to the outdoor
furnace as illustrated in Fig. 26, the circulating pump(s)
in the existing system must be located in the hot supply
line(s), not in the return line(s). A flow check or zone
valve will prevent thermal circulation and overheating
of building.
Fig. 26
24
It is very important to eliminate all air and water leaks
(valve packings, bleeders, etc.) and purge all air from
the existing system.
1. After filling the outdoor furnace (see Initial Start-
Up Procedures section) and existing system with
water, purge the air from the indoor system by
closing the valves on the outdoor furnace; then
pressurize the indoor system with water from the
domestic water line.
CAUTION
Do not apply more pressure to the indoor system
than the pressure relief valve on the existing
boiler is rated for.
2. Bleed air from the pressurized indoor system; then
operate the circulating pump(s) on the indoor system.
Perform this procedure twice. If any auto float vents
are used in the existing system, they must be capped
off tightly after the air bleeding is completed. This
eliminates the possibility of allowing air to enter
after the system is depressurized.
3. When the indoor system is completely purged of air,
close the valve on the water line used to pressurize
the indoor system. If any air is trapped in the
system, it can reduce water flow. This will prevent
the system from heating properly.
4. Open valves on the outdoor furnace, turn on the
pump and proceed to start the fire in the outdoor
furnace.
Bypass
Valve
Thermostatic
Valve
© 2015 Central Boiler
Section 1 - Furnace Installation