MODULEX EXT 321, 481, 641, 802, 962, 1123 BOILERS
Installation, Operation & Maintenance Manual
Page 70 of 146 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0087_0F
07/13/15 Phone: 800-526-0288 GF-143
Figure 3-37: Location of Minimum and Maximum Adjustments (Top View)
Maximum Output Calibration 3.33.2
After installing the gas analyzer probe (Figure 3-36), refer to Figure 3-37 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 3-36) and connect a
suitable gas analyzer.
2. Operate the burner to a minimum power following the procedure described in Section 3.34
(Figure 3-39) ‘’Sweeper’’ function (CASCADE MAN 100%).
3. Check that the CO
2
values are within the values indicated in Table 3-6.
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.
A
B
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