MC2: 10/03/12 Page 42 of 90
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
Modulex MLX Series Gas Fired Boiler System
Operation and Maintenance Manual
Chap 8: Safety
Device Testing
8.3 LOW GAS PRESSURE FAULT TEST
Refer to Figure 8-1 and ensure that the test port located on the manifold is closed. To perform the low gas
pressure fault test, follow the instructions below.
Low Gas Pressure Fault Test
1. Open the pressure port in the gas manifold and install the manometer. See Figure 8-1.
2. Set the ON/OFF switch to the ON position to start the E8 controller, then select the
GENERAL/SERVICE/CASCADE MANU menu, choose Burner 1, and set the valve position between
25% and 30%.
3. While the unit is firing, slowly close the external manual gas shut-off valve.
4. The unit should shut down and display an “E2” fault message at approximately 3.9” W.C. The fault
indicator on the E8 controller should also start flashing.
5. Fully open the external manual gas shut-off valve and reset the fault on the E8 controller (see
paragraph 8.2)..
6. The fault message should clear and the indicator displaying the E2 fault message should turn off.
7. Upon test completion, close the test port and remove the manometer.
Figure 8-1: Gas Pressure Tap Location and Orientation
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