High Altitude Conversion Label; Conversion From Natural Gas To Propane Gas - Watts AERCO EXT Installation, Operation & Maintenance Manual

Modulex EXT Commercial Series
CHAPTER 4: Installation Instructions

4.36 High Altitude Conversion Label

After calibration of the unit from Normal Altitude (0 - 2,000 feet) to High Altitude (2,000 – 4,500
feet) operation, the label below must be filled out with the appropriate information and applied to
the unit in close proximity to the rating label. If the unit is calibrated again for normal altitude
operation, the label should be removed.

4.37 Conversion From Natural Gas to Propane Gas

1. Set nominal heat by changing parameter 526 (FU: Fan maximum speed) of the BMM in the
Devices Menu. Refer to Modulex EXT Pressure and CO
appropriate value. This parameter requires a password to change.
2. Adjust CO (%) minimum and maximum levels according to the type of gas as shown in table
2
below. See Section 4.33 - Burner Calibration for more information.
Gas Type
Natural Gas
Propane Gas
3.
After gas conversion to propane and calibration, the gas installer should complete and apply
this label, or equivalent, as close to the rating label as possible:
OMM-0160_A • DRAFT
Figure 4-25: High Altitude Conversion Label
CO Level (%) Minimum Output
2
9.1
10.8
Figure 4-26: MODULEX EXT Label
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Level Calibration in Table 4-6 for the
2
CO Level (%) Maximum Output
2
9.2
10.8
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