NOTE
Final adjustment should be made after the burner has been firing continuously for at least 10 minutes, as the fan pulls less air when the flue gases are hot.
A. CHECK LIMIT CONTROL
- Run the burner long enough to bring the water temperature up to at least 190 degrees then turn the limit control setting until the burner stops.
NOTE
The Minimum limit setting for any hot water boiler should be 140 degrees F. in order to prevent corrosion of the flues on the fire side. The burner should be run with the primary control thermostat terminals jumpered and the burner controlled directly from an aquastat keeping the boiler hot all the time, thus eliminating the sweating of the flues on the fire side caused by starting from a cold start.
BELT ADJUSTMENT
The proper tension on the fuel unit belt drive is set at the factory. However, the belt should be checked periodically to see that the setting is maintained. To check setting, first, remove the belt guard and then, using fingers, compress the belt at a point midway between the sheaves. The proper setting at this point measured between the outer edges of the belt, should be between 1-3/4" and 1-7/8". If adjustment is necessary loosen the two mounting bolts, and move the fuel unit up or down to give the necessary belt setting. Then re-tighten the mounting bolts securely and replace the belt guard.
PERFORMANCE CHECK LIST
QUESTION: What Causes Unit To Soot Up?
Answers:
1. Nozzles
2. Flame Impingement
3. Firing Head
4. Leaks
5. Improper Burner Settings
6. Lack of Normal Maintenance
7. Poor Ignition
8. Retention Ring Cokes
Definitions of Answers:
1. Nozzles
A. Dirty
B. Wrong type of nozzle, or manufacturing defect
2. Flame Impingement
A. High CO2
B. Diffuser and choke ring clearance not uniform
C. Dirty nozzle, or poor patterns
D. Leaks
3. Firing Head
A. Diffuser and choke ring clearance not uniform
B. Diffuser and choke ring face dimension out of tolerance.
(See A Dimension, Figure 1)
C. Dirty fuel systems
4. Leaks
A. Induced fan gasket, or burner gasket improperly sealed
B. Front cover assembly improperly installed or sealed
5. Improper Burner Settings
A. Unit not checked out completely by the serviceman
B. Flame pattern erratic (Not concentric). Burner set up by
CO2 only (Burner should be set up by CO2, smoke and
visual observation.)
6. Lack of Normal Maintenance
A. Self explanatory (Recognition of the advantages of
preventive maintenance).
7. Poor Ignition
A. No delay in oil valve, unit flutters on start up.
B. Electrodes out of position
C. Too much combustion air (Air shutter open too wide)
8. Retention Ring Cokes
A. Defective nozzle
B. Cone, choke and nozzle out of adjustment (See Figure 1)
C. Fluttering starts
DOMESTIC HOT WATER