C24GA SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS
The screw head should not extend out past the screw housing.
1)If gas valve energizes, proceed to step 5.
2)If gas valve does not energize, check the following:
a.Remove the lead wires from the switch and verify with a meter that the switch contacts are closing with the blower on. If necessary, continue to turn the adjustment screw several turns counter- clockwise to close the switch contacts.
b.If the switch contacts are not closing, turn the power switch off, remove the pressure switch from the manifold and check the air orifice for debris build up and clogging. If debris is found, clean it away from the orifice.
c.Replace the orifice, pressure switch and connect the lead wires to the switch. Turn the power switch on and adjust the pressure switch again as outlined in steps 4A and 4B. Verify the pilot gas valve is energizing.
d.If the pilot gas valve is not energizing and power is available to the pressure switch, turn the power switch off. Replace with a new air pressure switch and adjust the switch as outlined from step 3 thru the end of this procedure.
5.Restart the ignition sequence by turning the power switch off, waiting 3 seconds, then back on.
A.Listen or use a meter for gas pilot ignition to verify operation.
1)If gas pilot ignition is successful, listen for main gas burner ignition to verify operation.
B.Verify the pilot and main burner both ignite in succession.
1)Restart the ignition sequence by rapidly turning the power switch off then back on. A rapid switching is needed to keep the generator from starting automatic blowdown.
C.Listen for main gas burner ignition to verify operation.
PILOT BURNER ADJUSTMENT
1.Shut the gas off at combination gas valve.
2.Remove cover from manifold pressure tap.
3.Install a barb fitting and connect manometer.
4.Turn on the steamer, let generator fill.
5.Verify air pressure setting is between 0.35" and 0.4" W.C.
6.Verify air pressure switch adjustment.
7.Turn off the steamer.
8.Remove pilot assembly from burner.
9.Remove cap from pilot adjustment screw.
10.Using cabinet tip screwdriver turn pilot adjustment screw all the way in.
11.Back out pilot adjustment screw 1 (one) turn counter clockwise.
12.Remove the wire from main valve (wire # 35).
13.Turn on the steamer, let generator fill.
14.Turn on combination gas valve.
15.Observe pilot flame; adjust pilot flame length using pilot adjustment screw. Set flame to approx. 2" long (Pilot flame should be a nice blue flame; with slight touch of yellow permissible at tip.)
F35425 (February 2006) |
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