Coil Tube Boiler Operator's Manual: Models CB-200-CTB, CB-350-CTB, and CB-500-CTB
6-5
Starting the Burner (continued)
6.
Checking for Proper CTB System Operation:
Observe the boiler temperature and water pressure.
7.
After the burner stops running when the operating aquastat set temperature is reached, check the
following:
•
air has been purged from water lines
•
water pressure is satisfactory (i.e. not greater than 22 psi; normal pressure is 12 psi)
•
all system controls functioning properly
8.
Reset the operating aquastat to the normal operating range (180-200
o
F
) and repeat steps 6
and 7, observing the CTB operation.
9.
Reset the load temperature controller (i.e. thermostat or aquastat) to the normal operating
temperature.
10.
As the CTB temperature drops, the burner will start running. Continue observing the CTB
operation through several burner ON/OFF cycles to ensure proper system performance.
11.
Fine Tuning the Combustion Air Band:
NOTE:
The initial setting of the combustion air band may require additional adjustment.
•
Refer to Figure 6A to identify the combustion air band location on the burner.
•
Observe the flame. The flame should be yellow-white with sharp tips and no "sparkles."
•
If the flame is orange in color or the flame length is too long, the oil you are burning
requires MORE combustion air. OPEN the air band 1/8" to 1/4", and re-check the flame
for the proper characteristics.
•
Re-check the flame after five minutes. You should see a yellow-white flame with sharp
tips and no "sparkles", and the flame should extend half of the way down the combustion
chamber.
12.
Checking for a Smokeless Burn:
Check for a smokeless burn by observing the stack while the burner is running. If you see any
smoke, repeat the previous steps for setting the combustion air band and adjusting the air
regulator. After adjusting the combustion air band, re-check the flame length.
NOTE:
Check for a smokeless burn periodically (as you do the flame length). Immediately
readjust the burner if you ever see smoke coming from the stack. Smoke indicates improper air/
fuel adjustment.
NOTE:
When using instruments to adjust the burner for a smokeless burn, the following
readings should be achieved:
•
Draft over fire should be -.02 inch w.c. to -.04 inch w.c.
•
Adjust for a smoke spot of a trace to 1
•
For the CB-500-CTB adjust for a
CO
2
reading of 12.5 to 14% or an
O
2
reading of 2 to 4%
•
For the CB-350-CTB adjust for a
CO
2
reading of 12 to 13.5% or an
O
2
reading of 4 to 7%
•
For the CB-200-CTB adjust for a
CO
2
reading of 10.5 to 12.5% or an
O
2
reading of 3 to 5%
•
Cad cell reading of 200 to 500 ohms
NOTE:
On the CB-200-CTB, the flame cannot be observed through the inspection door.
The
CB-200-CTB must be adjusted with instruments for proper combustion.
Obtain the above
settings by adjusting the air band 3/8" to 1/2". The metering pump will deliver a constant oil flow and
set the flame length accordingly.
Summary of Contents for CB-200-CTB
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