Smith Cast Iron Boilers 19A SERIES Cleaning Boiler Waterways, Owners Instructions

PAGE 9

19A SERIES BOILER

INSTALLATION INSTRUCTIONS

18. CLEANING BOILER WATERWAYS

A.STEAM BOILERS

NOTE

The boiler should be cleaned before connecting system piping and installing steam trim.

1.Plug unused openings all around the boiler leaving a valved overflow pipe connected to the safety valve tapping. Also provide a valved blow-down connection to one of the bottom tappings.

2.The fuel burning equipment should be installed and made ready to operate in accordance with the burner instructions.

3.Fill the boiler with water to the middle of the upper port, adding a boiler cleaning compound, as recommended in A.S.M.E. Section VI.

4.Fire the boiler for at least one hour at a low rate to circulated the cleaning compound through the boiler.

5.Blow off surface of boiler water through skimmer connection or through safety valve opening by feeding clean water into the boiler through a bottom fill connection.

6.When the water coming off the surface runs clear, shut off the burner, close the top valve and open the bottom blow- down valve. If there is a slight steam pressure in the boiler, it will assist the blow-down.

7.When the sections have cooled after blow-down, flush the interior of the boiler from the top by introducing water from a hose through the top port. When the water runs clear, complete the system piping, install the steam trim and

controls. Fill the boiler with clean water. Heat the boiler water to at least 180° F to release corrosive gases.

B.WATER BOILERS

NOTE

The system piping should be completed before cleaning the boiler.

1.Add an approved boiler compound. Follow the compound manufacturer's instructions for best results. Fill the system and vent air wherever necessary.

2.Heat the water to at least 180° F and circulate through all the piping system. After about one hour, drain the system thoroughly. Wash the interior of the boiler with a hose inserted through the top tapping. When blow-down water runs clean, allow boiler to cool, then fill the system with clean water.

3.Heat the water up to about 180° F and vent air as necessary to purge the system. The boiler is now ready to operate.

19. OWNERS INSTRUCTIONS

A.For best performance of the boiler, the following suggestions should be performed by a qualified boiler room technician, through a regular program of maintenance and adjustment to obtain the following.

1.Oil burner combustion: 12 to 12 1/2 + % CO2, zero smoke, smooth lightoff and operation.

Gas burner combustion: 10 to 10 1/2% CO2, 0.02% CO, smooth lightoff and operation.

2.Keep boiler fireside surface clean. Flue gas temperature reading above 450° F over boiler room temperature signals the start of soot accumulation. Inspect at least twice each year.

3.Steam boiler water condition should be observed. Unstable water line, system steam hammer indicate dirty water. Blow-down is recommended. However, the introduction of excess raw water to a steam boiler can result in the deposit of scale and inefficient operation of physical damage to the boiler.

4.Float operated and probe type low water cutoff devices should be maintained according to the instructions of the manufacturer.

5.Limit control function should be checked on a regular basis.

6.Flame safeguard controls should be checked regularly.

B.The products of combustion must be conducted to the outdoors by means of a metal connector of at least the same size as the boiler smokehood outlet and a chimney or stub- stack. The boiler is constructed for pressurized operation and the burners are selected for operation against a back pressure of 0.10 ins. w.c. at the boiler outlet. If the actual conditions cause a back pressure in excess of 0.10 ins. w.c. at the boiler outlet, consult the Smith Co. for verification of burner size. If the chimney has the ability to develop excess draft, a barometric draft control should be installed in the chimney. Check with the Smith representative for assistance.