Modulex EXT Commercial Series Boilers User Manual
CHAPTER 4: Installation Instructions
Page 66 of 144 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0095_0H
09/15/2017 Phone: 800-526-0288 GF-139
Figure 4-28: Location of Minimum and Maximum Adjustments (Top View)
4.33.2 Maximum Output Calibration
After installing the gas analyzer probe (Figure 4-27), refer to Figure 4-28 to locate the gas
valves and the Maximum Gas Adjustment screw (A) on each valve. Follow the instructions
below to set the maximum gas output level for each valve.
Adjusting the Maximum (A) Gas Output Setting
1. Remove the cap of the combustion gases sampling point (Figure 4-27) and connect a
suitable gas analyzer.
2. Operate the burner to a minimum power following the procedure described in Section 4.34
(Figure 4-30) ‘’Sweeper’’ function (CASCADE MAN 100%).
3. Check that the CO
2
values are within the values indicated in Table 4-6, below.
4. If necessary correct the value by turning the adjustment screw “A” in a CLOCKWISE
direction to decrease the value or ANTICLOCKWISE to increase the value.
5. Repeat the adjustment for all gas valves in the boiler.
REAR
FRONT
B
A
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