Specifications

9. Completely slide out the entire burner rack assembly from
unit.
10. Inspect the inlet of the heat exchanger tubes for presence of
V-shaped NOx baffles (see Fig. 1). If baffles are present,
they must be removed prior to converting unit for propane
gas. Using needle-nose pliers, remove NOx bafiles, squeeze
sides of the baffle, if necessary, to remove from the heat
exchanger tubes.
IMPORTANT: If it is expected that this unit will be converted
back to natural gas at a later time, these baffles should be retained
for reuse. Otherwise the baffles may be discarded.
11. Using a 5/16 in. nut driver, remove the four screws securing
the manifold/gas valve assembly to the burner assembly.
Save these screws.
12. For 2-Stage 40,000 Btu/hr and 60,000 Btu/hr models only!
Remove the burners from the rack, save the screws. Remove
the snap ring from the end of each burner. Install burner
insert in the end of each burner with the fiat sides of the
square vertical and horizontal. Replace the snap ring to
retain burner insert (See Fig. 3 for correct orientation).
Replace the burners in the rack using the saved screws,
making sure closed crossovers of burners are at each end.
13. Remove the natural gas orifices from the manifold using a
9/16 in. wrench and install the correct propane gas orifices
in the manifold (See Table 4 to select correct orifice size
based on rated input. See Fig. 4 and 7 for orifice
installation).
14. Replace the manifold/gas valve assembly into the burner
assembly using the four screws saved from item 11.
15. Remove the plug on the inlet end of the gas valve using a
3/16 in. hex wrench.
16. Install the 1/8 in. NPT x 3/4 in. (19 mm) close pipe nipple
where the plug was removed (see Fig. 9). Use pipe thread
dope (field-supplied, must be certified for use with propane
gas) for all joints, making sure not to get any excess in the
pipe or valve. Next, install a 1/8 in. elbow, a 1/8 in. NPT x
3/4 in. (19 mm) close pipe nipple, 1/8 in. elbow, 1/8 in. x
NPT 2 in. (51 mm) nipple, and a low gas pressure switch as
shown in Fig. 10.
17. Remove regulator cover screws for both high and low stage
gas regulators (see Fig. 3). Save regulator cover screws.