September
2012 Page
23
TYPICAL SYSTEM SCHEMATICS
PIPING INSTALLATION
1) Installing primary-secondary Tees (4” to 8” apart) in the return (“Cold”) line to the existing boiler.
2) Connect the solid fuel boiler supply and return lines as shown. Ensure that the supply (“Hot”) line is connected to
the Tee closest to the return of the existing boiler.
3) Ensure the neither the existing boiler nor the solid fuel boiler are isolated from the expansion tank.
DO NOT remove or alter the relief valve on the existing boiler. Failure to do so could result in
explosion causing severe injury, death, or property damage.
For your safety, turn off electrical power supply at service entrance panel before making any
electrical connections to avoid possible electric shock hazard. Failure to do so can cause serve
personal injury or death.
SAFETY LIMIT AQUASTAT (RECOMMENDED)
1) Mount directly on the supply (“Hot”) line out of the solid fuel boiler.
2) Set 150 higher than aquastat on solid fuel boiler, but never over 2000 F.
3) Wiring installation:
a) Route low voltage wire from ‘R’ screw and ‘W’ spade on safety limit aquastat into the existing relay on boiler or
to the zone valve.
b) If you have several zones in your heating system, wire a safety aquastat to allow circulation through the largest
zone. Wire a safety limit in parallel with the thermostat of the designated “dump zone”.
DANGER
DANGER
OPERATION
1) The solid boiler pump runs constantly, circulating
water through the solid fuel boiler via the primary-
secondary
Tees.
2) If the thermostat calls for heat, the existing boiler will
start the boiler pump. The burner will not fi re as long
as the start temperature is above the aquastat setting
on the existing boiler.
3) If the temperature from the solid fuel boiler falls below
the existing boiler aquastat setting, the existing boiler
will
fi re as normal.
4) A safety limit aquastat (recommended) attached to
the supply (“Hot”) line out of the solid fuel boiler turns
on a “dump” zone in the system that is able draw if heat
if the solid fuel boiler over temps.
