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SIT millivolt Gas Valve
pressure
Regulator
Remove
These
Components
Figure 39
b. Refer to Figure 40 and remove the pilot hood
assembly to access the hexed pilot orifice.
Remove and replace the orifice with the one
provided with the kit.
pilot Hood
pilot for SIT millivolt
Gas Valve
pilot
Orifice
Figure 40
Step 7. Electronic Appliances -
Honeywell Systems
See Figure 41 and the instructions provided with
the kit. Remove the slotted cap screw, o-ring,
pressure-regulating adjusting screw and spring.
Retain all parts for possible later use. Install
new components from the kit. Black cap and
red spring for propane gas units. Silver cap and
stainless steel spring for natural gas units.
Inlet pressure Test port
manifold
pressure
Test port
Slotted
Cap
Adjusting
Screw
Figure 41
See Figure 42 and replace the pilot orifice as fol-
lows: Remove the igniter assembly retainer clip,
and carefully remove the igniter assembly.
Exercise extreme care to prevent damage to
or breakage of the igniter assembly. Remove
the screw securing the pilot assembly to its
mounting bracket. Back off the flare nut at
the end of the pilot gas line to free the pilot
assembly from the gas line. 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.
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.
pilot Orifice
Note: If the Igniter is damaged, a re-
placement kit is available - order Catalog
Number 87L54.
Figure 42
All models
Step 8. VERIFY THE pROpER ORIFICE SIZE
bEFORE INSTALLING IT.
Figure 43 illustrates the orifice.
Remove the orifice from the manifold, and
replace it with the one provided with the kit.
See Table 8 for orifice sizes for natural and
propane models.
Use pipe joint compound or Teflon tape on all
pipe fittings before installing.
Note: ALWAYS use propane-resistant com-
pounds in propane applications. NEVER use
pipe joint compounds on flare fittings.
Spring
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
pilot Assembly
Igniter Assembly
Retaining Clip
Flare Nut
burner Orifice Sizes
Elevation 0-4500 feet ( 0-1372 meters)
Natural
models
Gas
drill size (inches)
MPB-3328
#47 (.0785")
MPB-3530
#44 (.086")
MPB-4035
#37 (.104")
MPB-4540
#36 (.1065")
Table 8
Figure 43
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.
Step 12. Attach manometer to the manifold
side pressure test fitting and verify manifold
pressure reads 3.5 inches water column (0.87
kPa) for natural gas, and 10.0 inches water
column (2.49 kPa) for propane gas.
ALWAYS TEST pRESSURES WITH THE VALVE
REGULATOR CONTROL AT THE HIGHEST
SETTING.
propane
Gas
drill size (inches)
#1.2mm (.048")
#55 (.052")
1/16" (.0625")
#52 (.0635")
27
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