CleaverBrooks ProFire D Series - Startup and Operating for Gas Burners; Startup and Operating for Oil Burners

Operation
3-6
750-204
Profire D/LND
3.8 — Startup and Operating
3.8.1 — Gas Burners
1. Close the main and pilot gas cocks. Make sure the “ON-OFF” switch is in the “OFF” position and the fuel
selector switch is on “GAS.”
2. Actuate the manual reset button of the flame safeguard control to close the safety switch contacts.
3. Set the “MANUAL-AUTO” switch to “MANUAL.”
4. Set the manual potentiometer in the low fire position.
5. Open the gas pilot cock.
6. Set the “ON-OFF” switch to “ON.” The burner will start and pre-purge. After pre-purge, the ignition trans-
former and the gas pilot solenoid are energized. Before proceeding, conduct electrical interference and pilot
turndown tests if not previously done.
7. On initial startup it is recommended that the main gas shutoff cock remain closed until the programmer has
cycled through pre-purge and pilot sequence. Then determine that the main gas valve opens. When this is
confirmed, turn the burner switch “OFF” and allow the programmer to finish its cycle. Check to see that the
gas valve has closed tightly. If ignition does not occur, turn the burner switch “OFF” and allow the program-
mer to recycle for a new ignition trial.
8. Turn the burner “ON” and after pilot ignition when the flame relay pulls in, the slow opening, motorized, main
gas valve is energized. Slowly open the downstream manual shutoff gas cock. The main flame should ignite at
this time. The gas valve and air damper continue advancing until high fire is reached.
9. Do not repeat unsuccessful light off attempts without rechecking burner and pilot adjustment. Vent fuel
vapors from the combustion chamber after each unsuccessful light off attempt. Set the gas low fire rate by
adjusting the butterfly valve and air linkage. When low fire is adjusted, shut down the burner. Restart several
times to be sure the low fire setting is suitable. Readjust if necessary. Never start the burner with fuel vapor in
the furnace. In case of an emergency, open the main power switches and close all fuel valves. After combus-
tion adjustments are satisfactorily set, allow the heating vessel to slowly reach normal operating pressure or
temperature.
10. Turn the potentiometer switch to the high fire position. Check high fire at this point using combustion instru-
ments.
11. Do not disturb established low fire adjustment. Allow the burner to return to low fire position before adjusting
high or intermediate settings.
High fire combustion analysis typically is 9% to 10.5% CO
2
. When conditions covered above are assured, refer
to Sections 3.9 and 3.10.
3.8.2 — Oil Burners
1. Set the fuel selector to “OIL.” On initial startup of a combination burner, it is recommended that oil firing be
adjusted before gas firing. The gas low firing rate is set to match oil low fire rate.
2. Be sure the “ON-OFF” switch is in the “OFF” position and the fuel selector switch is on “OIL.” Actuate the
manual reset button of the flame safeguard control to close the safety switch contacts. Be sure the “MANUAL-
AUTO” switch is in the “MANUAL” position. Set the manual modulating control potentiometer to the “LO” fire
position. Open the pilot gas valve (if used).
3. Set the “ON-OFF” switch to “ON.” The burner will start and pre-purge. After pre-purge, the ignition trans-
former and the gas pilot are energized. Before proceeding, conduct electrical interference and pilot turndown
tests if not previously done. Refer to Chapter 4, Sections 4.3 and 4.4.