Granby B*G-3, Инструкция по установке, эксплуатации и обслуживанию, Страница: 10 / 37

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The boiler is now ready for piping and connection to the fuel system, heating and
domestic hot water, thermostat and 110 Volt - 60Hz power source.
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/G boiler 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 boiler 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 12psi 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. The installation of the relief valve must be consistent
with ANSI/ASME Boiler and pressure vessel code Section IV or Boiler, Pressure vessel and
Pressure piping code CSA B51 as applicable.
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
Hydronics 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.
Circulating Pump
A calculation for proper pump selection must be performed for all installations. The pump(s)
should not be operated at maximum working pressures above 30 psi or maximum working
temperatures above 185°F and within limits advised by the manufacturer. The pump must not
be operated unless the system has been bled of all air and completely filled with water.
Recommended locations for the circulating pump, expansion tank, relief
valve and other trim are shown in Figure 1, Figure 2, Figure 3 and Figure 4.