88
042-288-B0-001, Rev. A2
Calibration Procedure:
1. Set the ECM Run/Auto/Stop (RAS) switch to the STOP position.
2. Remove the Allen-head screw located on the secondary or demand regulator.
3. Open both ports on the DWYER #1212 manometer.
4. Set the scale of “0” between the water lines. Connect the pressure test hose.
5. Remove the Maxitrol regulator adjustment cover (located in the gas service box outside
of the enclosure).
6. Apply 0.5 psi to 2.0 psi gas pressure to the gas package.
7. Place the ECM’s RAS switch in the RUN position. The starter then cranks the engine until
the generator starts (this may take a few seconds to draw excess air from hoses). When
the ECM RAS switch is placed in the RUN position, the ECM starts the engine.
8. Verify the DWYER #1212 manometer reads 5-1/2" above the “0” mark, and 5-1/2" below
the “0” mark. This equals 11" water column of pressure. Adjust the Maxitrol regulator in a
clockwise direction to increase pressure, and in a counterclockwise direction to decrease
pressure.
7.0 Maintenance, continued
7.9 Maxitrol Pre-regulator Calibration, continued
• No matches or open ame or sparks. Use caution whenever working in the area to
prevent possible combustion of fuel vapors.
• Leak Hazard: Use caution whenever working in the area to prevent and correct any
leaks detected.
WARNING!
Fig. 7-16, Manometer Connection
Do not bottom out the regulator adjust screw. If you cannot get a reading, retest the inlet pressure
to the Maxitrol gas package.
CAUTION!
9. Press and hold the ECM’s RAS switch in the STOP position until the generator stops.
10. Disconnect the DWYER #1212 manometer gas pressure test kit from the secondary
demand regulator.
11. Reapply a small amount of an approved pipe sealant to the Allen-head cap screw,
replace and tighten into the demand regulator.
12. Replace the Maxtrol regulator access cap and gasket, and tighten.
Reverse view of demand
regulator showing port
Connect hose and tting to the
demand regulator
5 ½"
5 ½"
KEEP PORT OPEN
11"
WATER
COLUMN TOTAL
DWYER
1212
MANOMETER
