Practical Pointers | Fives North American

NOZZLE MIX SYSTEMS

Replace the cover plug. The regulator is then adjusted for atomizing air plus main air at any firing rate, and the burner will have the same capacity when operating on gas as on oil. (If the burner cannot be lighted on atomizing air only, adjust the spring adjusting plug with the main air at low fire setting)

SERVICING

To check regulator operation, 1⁄8 " pipe taps are provided on the body for inlet and outlet pressure readings. UNABLE TO ACHIEVE MINIMUM OR "0" FLOW 1. Make sure that the regulator has been adjusted correctly as in steps 3 or 4 (under Lighting and Adjustment). 2. Disconnect the air impulse line at the regulator to ensure that there is no loading pressure. 3. Connect a manometer to the 1⁄8 " outlet tap to determine if the combustion chamber is under a negative pressure. If so, cross-connect the regulator vent to the combustion chamber as shown in Figure 2 or 5 on previous pages. 4. Shut off gas supply, remove body plug, apply air impulse (about 16 osi) to the vent to raise regulator valve off seat, wipe seat surfaces with cloth to remove possible pipe scale, dirt, pipe thread chips, or other foreign matter. Remove the air impulse and replace the body plug. 5. Shut off gas supply, remove body plug and inlet test tap plug. While pressing gently downward on regulator valve, attempt to blow through a rubber tube attached to the inlet test tap. If back pressure dœs not build up, the balancing diaphragm is ruptured and must be replaced. (As an alternate test, try to wobble the regulator valve with a finger. If the balancing diaphragm is intact, it will hold the valve fairly rigid)

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