7.Continue this process for a minimum of one hour. The process should continue until the steam is dry (no water coming from the vent when the water in the gauge glass is at a normal level, approximately 2/3 full). The time required could vary up to 3 hours.

8.Turn burner to off position. While boiler is still hot, drain completely through boiler drain. Make sure that all low points in the return line are also completely drained. These areas could trap chemicals and dirt.

9.Close boiler drain and refill with clean untreated warm water. If warm water is not used, fill very slowly so as not to crack boiler sections. Fill until water overflows through vent pipe and runs clear.

10.Completely drain boiler again.Refill with clean untreated water to normal level.

11.Remove vent drain piping and reinstall pressure relief valve. Open gate valves on supply and return lines. Turn on burner. System is now ready to operate.

HOW TO CHANGE ORIFICES

1.Shut off power supply and gas supply to the boiler.

2.Remove burner access panel. Lift burners up and to rear until burners are disengaged from orifices.

3.Check orifices for proper drill size. Size is stamped onto the body of the brass orifice (see Figure 4.1). Size can also be checked by using a pin gauge.

4.All orifices are screwed into the manifold and may be removed by using a 5/8" wrench or socket.

5.Reverse procedures above to install orifices and burners. BE SURE TO REINSTALL BURNERS WITH BURNER PORTS ON TOP SURFACE (UPRIGHT).

FIGURE 4.1

HEATING SYSTEM PROBLEMS & CAUSES No Heat

1.Blown fuse or circuit breaker.

2.Switch turned off.

3.Pilot outage

4.IID system malfunction.

5.Flue damper not open.

6.Water level too low.

Insufficient Heat

1.Incorrect thermostat anticipator setting.

2.Low pressuretrol setting.

3.Boiler undersized or underfired.

4.Insufficient radiation.

Odor, Excessive Moisture In Building

1.Leak in piping.

2.Carbon build-up in flueways.

3.Blocked chimney.

Yellow Flame, Carbon Build-Up

1.Unit overfired.

2.Air shutter misadjustment.

3.Wrong orifices.

4.Burning in burner mixing tube.

Noise

1.Ignition or ignition noise due to incorrect air shutter adjustment.

2.Whistle due to burr on orifices.

3.Burner "fluting" due to air shutter opening too wide.

Overheating

1.Wrong thermostat anticipator setting.

2.Bad thermostat location.

3.Bad thermostat.

Boiler

GB250-5L GB250-5H

GB250-6

GB250-7

GB250-8

GB250-9

Model

 

 

 

 

 

 

(1) Nat. Gas

34

32

31

33

32

32

Drill Size

 

 

 

 

 

 

(2) Prop. Gas

52

50

50

51

51

50

Drill Size

 

 

 

 

 

 

CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.

Verify proper operation after servicing.

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