8
Upon completion of the jacket assembly the control unit can be mounted on the side of
the boiler.
Honeywell L7248 Aquastat or Fuel Smart HydroStat 3250 boiler control.
B*C-3 sections boiler illustrated
The boiler is now ready for piping and connection to the fuel system, heating and
domestic hot water, thermostat and 110 Volt 60 cycle AC current.
CAUTION: Safety or relief valve discharge should be piped downward to within
6” of the floor or to a drain. The valve must be mounted in a vertical position.
4.0 PIPING
Prior to connecting the B*C to an existing piping system certain procedures must be followed.
The system should be flushed to insure that scale and sludge will not be introduced to the
boiler. This is a must when replacing a gravity open system.
The B*C is a low mass boiler requiring low water content and steps must be taken to insure
that the boiler is not flooded from an existing high volume standing cast iron system. If the
conversion is from a high volume system a bypass loop must be installed.
Manual shut off valves must be installed on both the supply line and on the boiler bypass
loop. ASME Boiler Code requires that feed or make up water be introduced to the piping
system and not directly to the boiler. Pressure reducing valves should be installed and
adjusted to 12 psi cold water. The pressure relief valve must be piped from the boiler and
downward to within 6” of the floor or to a height to meet existing code. An expansion tank,
circulating pump and automatic air eliminators must be part of the system. The relief valve,
backflow preventer and drain valve should be piped according to code to a drain with piping
that is the same size as the relief valve.
All piping, including heating, domestic hot water and fuel lines must be done in accordance
with all local codes. It is suggested that you refer to the Water Installation Survey and
Hydronic Institute Residential Hydronic Heating Installation/Design Guide. All piping must be
properly sized, free from defect and be made of copper, steel, brass, aluminum or PEX.
