INSTALLATION AND OPERATION MANUAL, GAS FIRED STEAMER, MODELS GCX-2, GCX-10
PART NUMBER 10056R3
23
2009-03-24
TO CALIBRATE PRESSURE SWITCHES
Pressure switch range is from 1 to 15 psi.
Adjust all settings to maximum on high signal adjustment screw on pressure switches.
Adjust in the following sequence:
- High limit pressure switch.
- Override pressure switch.
- Operating pressure switch.
- Turning screw clockwise to increase, counterclockwise to decrease pressure.
- Use relief valve to release pressure from boiler for setting adjustments.
1.
HIGH LIMIT PRESSURE SWITCHES
Allow pressure to build until unit shuts off. This should occur at 15 psi. Set the high signal
to switch at 14.5 psi on the gauge and the low signal to 13.0 psi.
2.
OVERRIDE PRESSURE SWITCHES
Allow pressure to increase to 13 psi. Set the high signal to switch at 13 psi on the gauge
and the low signal to 11 psi.
3. OPERATING PRESSURE SWITCHES
Set the high signal to switch at 11 psi on the gauge and the low signal to 9 psi.
4.
Release pressure in boiler to below 9 psi. Burner will come on. Once pressure has
reached 11 psi, burners will shut off. Repeat this process several times to make sure
burners come on at 9 psi and shut off at 11 psi.
NOTE: Pressure switches are factory set. Calibration is only required if
pressure switches are replaced or if adjustment is required.
