CleaverBrooks CBLE, Operation And Maintenance Manual

Page: 82 / 194

Starting and Operating Instructions
5-10 750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
prepared to provide the correct boiler serial number. Chapter 6 contains additional information along with stan-
dard gas flow and pressure requirements.
6.
If the burner is a combination fuel model, set the gas/oil switch to “gas.” Withdraw the oil burner gun and latch
it in its rearward (OUT) position.
FIGURE 5-5.
Latch Oil Burner Gun “IN” and “OUT” Positions
7.
On initial startup, it is recommended that the main gas shutoff cock remains closed until the programmer has
cycled through pre-purge and pilot sequences. When the fuel light on the control panel comes on, observe the
action of the motorized gas valve stem to determine that it opens when energized.
8.
As soon as it is confirmed, turn the burner switch “OFF” and let the programmer finish its cycle.
9.
Check that the gas valve has closed.
10.
Again, turn the burner “ON.”
11.
When the fuel valve light flows, slowly open the main gas cock. Main flame should ignite unless there is air pres-
ent in the line.
12.
If the flame is not established within about 5 seconds, turn the burner switch “OFF” and allow the programmer
to recycle normally for a new lighting trial. Several efforts may be necessary to “bleed” air from the line.
13.
Once the main flame is established, turn the burner switch to the “OFF” position and observe that the flame is
extinguished promptly. The flame may continue to burn for a second or two after normal shutdown due to the
gas remaining downstream from the fuel valve.
14.
If the flame continues to burn for a longer period or during blower motor spindown, it could indicate a main
gas valve leak. Immediately turn the burner switch off and close the main gas cock.
Do not repeat unsuccessful lighting attempts without rechecking the burner and pilot adjustments. Failure to follow
these instructions could result in serious injury or death.
NOTE: The burner and control system is designed to provide a “pre-purge” period of fan operation prior to establish-
ing ignition spark and pilot flame. Do not attempt to alter the system or to take any action that might circumvent the
feature.
! Warning