PB Heat 211A manual Check Boiler Controls, Clean the Boiler, Meter reading. Rate, Btu/Hr = F x H x

STARTING THE BOILER

e. The Minimum input rate listed on the nameplate applies to boilers with staged firing rate. This minimum rate is not adjustable. It is controlled by an orifice in the gas train.

6. Check the burner input by reading the gas meter.

a. Each of the burners is rated at 105,000 Btu/hr (30.8 kW) for Natural Gas with a 0.60 specific gravity.

b. Each of the burners is rated at 102,500 Btu/hr (30 kW) for Propane (LP) Gas with a 1.56 specific gravity.

c. (U.S.) Determine the input by multiplying “F” – Meter Reading (Cubic Feet of Gas) times “H” – Heating Value of Gas (Btu per Cubic Foot) times 3600. Divide by “T” – the time in seconds at the

meter reading. Rate, Btu/Hr = F x H x 3600

T

(Metric) Determine the input by multiplying “F”– Meter Reading (Cubic Meters of Gas) times “H” – Heating Value of Gas (Joules per Cubic Meter).

Divide by “T” – the time in seconds of the meter

reading. Rate, Watts = F x H T

d.Note: If the meter is not automatically corrected for temperature and pressure, the meter reading must be corrected to actual conditions during the rate test.

7.Adjustment of Primary Air

a.A bag of air adjustment screws is provided with the boiler, attached to one of the burners with pilot bracket.

b.Primary air adjustment is not normally required.

c.If primary air adjustment is needed, insert the self-tapping screws into the holes located on the top front of the burners.

d.Turn the screws in all the way until yellow flame tips appear. Turn the screws back out until the yellow tips disappear.

F.CHECK BOILER CONTROLS

1.Limit and Operating Pressure Controls

a.Lower the setting of each control until the burners shut down.

2.Low Water Cut-offs

a.Lower the water level in the boiler to below the control cut-off level. The burners should shut down.

3.Main Burner Shut-Off Valve(s)

a.Close Main Burner Shut-Off Valve(s).

b.The burners should shut down.

4.Check all controls to make sure they function correctly.

5.After all controls have been proven, set the Operating and Limit Pressure Controls to the pressures desired.

G.CLEAN THE BOILER

1.Clean the boiler as described below no later than one week after the initial start-up. Cleaning will be more effective if the boiler operates a day or two to loosen sediment and impurities in the system.

2.The boiler must be cleaned to remove any accumulation of oil, grease, sludge, etc. that may be

in the system. These substances can cause foaming and surging of the boiler water, producing an unstable water line and water carryover to the system.

WARNING

Cleaning the boiler requires the use of very hot water and corrosive chemicals. Use care when handling to prevent injury.

3.The piping for a skim valve must be done as shown in Section 5, “Pipe the Boiler,” of this manual, with the skim valve mounted off of one of the end riser connections.

4.Connect a 2 inch drain line off of the skim valve, run to a point of safe discharge.

5.Close all valves to the system. Provide a means of continuous fresh water to the boiler for the cleaning process.

6.Use common washing soda (such as Arm and Hammer Super Washing Soda). Mix the soda with water in a 10 quart (9.5 liter) pail and pour into the boiler through the safety valve tapping. Use a proportion of one (1) pound (.5 kg) of washing soda for each 800 square feet (74 m²) EDR net boiler rating.

7.Open the skim valve. Fill the boiler until water begins to flow out the valve.

CAUTION

Do not leave the boiler unattended while firing.

Take great care not to allow the water level to drop below the bottom of the gauge glass or to allow fresh water make-up to flow in too fast. This will avoid the possibility of causing the boiler sections to fracture.

8.Turn burners on and allow the boiler water to heat up to just below steaming [180 to 200ºF (82 to 93ºC)]. Cycle the burners to maintain temperature during skimming. Do not allow the boiler to steam. Steaming mixes up the contaminants in the water instead of floating them at the surface.

9.Open the make-up water valve to continuously feed water to the boiler. Allow water to flow out of the skim tapping.

10.Continue skimming the boiler until the water flowing from the skim tapping flows clear. This will take some time, possibly several hours for a dirty system.

11.After skimming is complete, close the skim valve and turn off the boiler.

12.Close the make-up water valve and open the boiler blowdown valves.

13.Drain the boiler completely. Then refill and drain again one or two times to make sure all of the soda has been washed out.

14.Restore piping to normal. Pipe a nipple and cap in the skim valve.

15.Note: If the gauge glass becomes dirty again, this indicates more contaminants have worked loose in the system. Repeat the cleaning and skimming process as needed to clean the system.

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