19
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • CRESTLINE™ SERIES B-VENT GAS FIREPLACES • 36"/42" LSBV MODELS • INSTALLATION INSTRUCTIONS
Burner Orifice Sizes (all models)
Elevation
Feet (meters)
Natural
Gas
drill size (inches)
Propane
Gas
drill size (inches)
0-4500
(0-1372)
#26 (0.147")
*
H5805 •
#45 (0.082")
*
39L66 •
Table 5
* Standard size installed at factory
• Part /Cat. Number
Figure 33
Figure 34
Step 9.
Reassemble all removed components
by reversing the procedures outlined in the
preceding steps. Use pipe joint compound or
Teflon tape on all pipe fittings before installing
(ensure propane resistant compounds are used
in propane applications, do not use pipe joint
compounds on flare fittings).
Step 10.
Attach the conversion label provided
in the conversion kit to the rating plate on the
appliance.
Step 11.
Turn on gas supply and test for gas
leaks
(see
Step 6
on
Page 8
).
Step 5. Millivolt Systems
– Attach manometer
to the manifold side pressure test fitting and
verify manifold pressure reads 3.5" water col-
umn (0.87 kPa) for natural gas, and 10.0" water
column (2.49 kPa) for propane gas.
Step 6.
See
Figure 31
and remove the pilot
hood assembly to access the hexed pilot orifice.
Remove and replace the orifice with the one
provided with the kit.
When reinstalling the igniter assembly, use
extreme care to prevent damage and break-
age. Do not apply any leverage to the igniter
assembly while restoring the retainer clip to
its original position
.
All Models
Step 8.
Unscrew the orifice from the manifold
and replace it with the one provided with the
kit
.
See the following table for orifice sizes
for natural and propane models.
Figure 34
illustrates the orifice.
Refer to
Figure 32
and replace the pilot orifice
as follows: Remove the pilot hood assemble
to access the hexed pilot orifice.
Remove the pilot orifice and replace it with the
one provided with the conversion kit. Reinstall
the pilot assembly by reversing the steps
detailed here.
Pilot
Orifice
Pilot
Orifice
Electronic Appliances
Step 7.
SIT Electronic Valves
- See
Figure
33
and the instructions provided with the
kit. Remove the slotted cap screw, o-ring,
pressure-regulating adjusting screw and spring,
then discard.
Modify the pressure regulator from the kit.
Using a standard tin snip cutting tool, proceed
to trim shoulder off of the regulator.
Install new components and modified pressure
regulator from the kit.
Attach manometer to the manifold side pressure
test fitting and adjust screw until pressure reads
3.5" water column (0.87 kPa) for natural gas, and
10.0" water column (2.49 kPa) for propane gas.
Modified Kit
Pressure Regulator
- After Trim
Remove
These
Components
SIT VALVE
Kit Pressure
Regulator - Before
Trim
Figure 31
Figure 32
Gas Conversion Kits (continued)
