Watts Aerco Modulex MLX EXT 1530 - Conversion from Natural Gas to Propane Gas

Modulex EXT Commercial Series Boilers User Manual
CHAPTER 4: Installation Instructions
OMM-0095_0H AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 73 of 144
GF-139 Phone: 800-526-0288 09/15/2017
4.37 CONVERSION FROM NATURAL GAS TO PROPANE GAS
To convert the unit to use propane gas, instead of natural gas, do the following:
Converting From Natural Gas to Propane Gas
1. Set nominal heat by adjusting the fan speed parameter FH (FAN MAX) from the E8
controller as shown in Table 4-6, MODULEX EXT Pressure and CO
2
Level Calibration
Tables in Section 4.33.4. This parameter requires a password to change.
2. Adjust CO
2
(%) minimum and maximum levels according to the type of gas as shown in the
table below. See section 4.33 - Burner Calibration, above, for more information.
GAS TYPE
CO
2
LEVEL (%) MINIMUM
CO
2
LEVEL (%) MAXIMUM
Natural Gas 8.5 10
Propane Gas
10 11
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:
Figure 4-33: MODULEX EXT Label