Natco ANSI Z 21.10.3 Service Manual page 34

Super high efficiency gas fired water heating combination appliance
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B.
IF IGNITION WAS POOR:
1.
LOOK AT THE COLOR OF THE FLAME WHILE THE UNIT IS RUNNING, THROUGH THE SIGHT GLASS.
IF IT IS GREEN OR RED IN COLOR, OR THE HEATER WHISTLES ON IGNITION, TURN THE
ADJUSTMENT SCREW COUNTERCLOCKWISE AT ½ TURN INTERVALS, UNTIL THE FLAME TURNS
BLUE/LIGHT BLUE IN COLOR, OR THE WHISTLING AT IGNITION STOPS. IF THE FLAME IS VERY
WEAK OR PULSING, TURN THE ADJUSTMENT SCREW CLOCKWISE UNTIL THE FLAME STEADIES.
2.
PUT THE GAS VALVE ADJUSTMENT SCREW COVER BACK IN PLACE AND TIGHTEN.
3.
PUT THE VOYAGER CABINET DOOR BACK INTO PLACE.
PROCEDURE #2
1.
REMOVE THE OUTLET PRESSURE TAP PLUG FROM THE RIGHT SIDE OF THE GAS VALVE WITH A 3/16" ALLEN
WRENCH.
2.
PUT A 1/8" NPT HOSE BARB IN PLACE OF THE OUTLET PRESSURE TAP PLUG. NO SEALANT IS REQUIRED ON THIS
FITTING.
3.
RE-CONNECT THE GAS VALVE WIRING TO THE GAS VALVE.
4.
SLIDE THE GAS VALVE BACK INTO POSITION BY PUTTING THE GAS VALVE INLET PIPE THROUGH THE GAS VALVE
INLET HOLE IN THE LEFT-TOP OF THE VOYAGER CABINET.
5.
PLACE THE GAS ORIFICE BACK ON THE BOTTOM HALF OF THE UNION AND TIGHTEN THE UNION.
PAGE: 34

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