I.C.E. GIDM-325 - Manual (Page 14)

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ECONOMITE 400-33 & F400-33 GAS BURNERS
INITIAL START UP AND ADJUSTMENT
CAUTION: Only qualified service personnel should attempt initial start-up.
1. Study these instructions, the wiring diagrams and flame safeguard instructions. Locate and identify all of the
burner components.
2. Have on hand: CO and CO
2
tester, stack thermometer, 0” to 30” W.C. gas pressure gauge, U-Tube manometer
and DC volt meter.
3. Make the proper setting on all limit controls and set the operating control to call for heat.
4. Check the piping for leaks. A quick way to do this is to turn off main shut-off valve “A” and pilot valve “B”,
then turn on the gas pressure to the gas supply line and observe the meter test dial. There should be no
movement of the dial hand for at least five minutes on a half foot dial (proportionally longer on larger dials).
All other gas appliances must, of course, be completely shut off during this test. If a leak is detected it should be
located with a soap suds test and corrected. If air or inert gas (do not use oxygen) under pressure is used for
leak detection, do not subject the main and pilot valves or regulators to pressure readings exceeding ½ PSI
(disconnect piping to prevent damage during high pressure leak testing).
5. Purge the gas supply line up to the main and pilot manual valves. Do not purge into the combustion chamber.
6. Make sure that the main and pilot manual gas valves are closed and that the burner line switch is off.
7. The pilot gas pressure regulator is set for 3 ½ ” W.C. outlet pressure which is suitable for natural gas and
average draft conditions. If propane gas is to be used, adjust the regulator to its minimum outlet pressure
setting.
8. Firmly push in the flame safeguard manual reset button “C” and the Model F400 motor manual overload reset.
9. Check that the blower motor rotates freely.
10. Turn line switch on momentarily and check for proper blower wheel rotation.
11. Open pilot manual valve “B”.
12. Trial for pilot ignition. Turn switch to winter operation. If power vented, burner will be powered when air
switch contacts close. Flame safeguard is powered, motor relay 3K pulls in. As motor reaches operating speed,
the blower interlock switch “makes” to initiate a 30 second prepurge period. After prepurge, the load relay 1K
pulls in to energize the pilot solenoid and ignition transformer and the pilot should light.
13. If the pilot fails to light during the 15 second trial, it is probably due to air in the pilot line. Wait one minute and
push flame safeguard reset button to restart, (400 motor will continue to run during the safety lockout. F400
motor will stop approximately 15 seconds after solenoid valve closes).
14. Observe the pilot flame. If it is weak, screw in the pilot regulator adjustment. If it is excessively rich and large
or floating from the pilot tip, back off the regulator adjustment. Set the pilot to a stable blue flame which burns
firmly within the pilot tip. Check flame current with a DC volt meter. It should show a steady 15-17 volts
(Fireye) or 3-5 VDC (Honeywell). Operate air shutter throughout range to check pilot stability. Adjust pilot
regulator slowly to obtain highest reading possible, try several relights.
15. Set the shutter to match the intended input, i.e. full open for maximum, closed for minimum or partially open
for mid-range.
16. Slowly open main manual valve until the main flame ignites. Continue to open valve, adjusting air shutter if
necessary, if the manual valve is fully opened before input is reached, screw in regulator adjustment. Set
regulator to desired manifold pressure, marked on the rating plate.
NOTE: Do not screw the adjusting nut in past the point where no further increase in manifold pressure is noted.
If the specified pressure cannot be reached, check for proper inlet pressure at the inlet of the main manual valve
with the burner running.
17. Readjust the main air shutter to provide a quiet soft flame-blue at the burner nozzle with well defined orange tips
for natural gas or with well defined yellow tips for propane.
18. The primary air adjustment which affects the flame length, has been set wide open for average conditions.
Decrease the primary air if a longer, softer flame is desired.
19. Cycle the burner on and off several times to check its operation.
20. Check the operation of the limit and operating controls.
21. Check the flue gas temperature ahead of the diverter. It should be above 300
°F . Excessive flue temperatures
will result in low efficiencies. Low flue temperatures may cause excessive condensation. Reset gas input if
necessary to adjust stack temperature, (on/off operation only).