Lennox Hearth Products Direct Vent MPD-33 Series Installation Instructions Manual page 32

Step 6. Electronic Appliances -
Honeywell Systems
See Figure 65 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. Before installing the
cap, attach manometer to the manifold side
pressure test fitting and adjust screw until
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.
Inlet Pressure Test Port
Manifold
Pressure
Test Port
Slotted
Cap
Adjusting
Screw
Figure 65
Pilot
Orifice
Flare Nut
Note:
If the ignitor is damaged, a replacement kit is available - order Catalog Number 87L54.
Figure 66
Lennox Hearth Products reserves the right to make changes at any time, without notice, in
design, materials, specifications, prices and also to discontinue colors, styles and products.
Consult your local distributor for fireplace code information.
Printed in U.S.A. © 2002 by Lennox Hearth Products
P/N 850,014M REV. R 06/2008
See Figure 66 and replace the pilot orifice as
follows: Remove the ignitor assembly retainer
clip, and carefully remove the ignitor assembly.
Exercise extreme care to prevent damage to
or breakage of the ignitor 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 ignitor assembly, use
extreme care to prevent damage and break-
age. Do not apply any leverage to the ignitor
assembly while restoring the retainer clip to
its original position.
All Models
Step 8. Remove the burner orifice from the
manifold and replace it with the one pro-
vided with the kit. See the following table for
orifice sizes for natural and propane mod-
els . Figure 67 illustrated the orifice.
Spring
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Pilot
Assembly
Ignitor
Assembly
Retaining
Clip
r O i f i e c i s e z
M d o l e
S e i r s e
N a . t P o r . p
M P D - T 3 3 8 2
# 5 4 0 0 . 8 4 n i
M P D - R 3 3 8 2
M P - D 5 3 0 3 # 4 4 # 5 5
M P - D 0 4 5 3 # 7 3 0 0 . 2 6 n i
M P - D 5 4 0 4 # 6 3 # 2 5
Figure 67
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.
1110 West Taft Avenue • Orange, CA 92865
E e l a v i t n o
e F t e
( m t e r e ) s
h c
- 0 5 4 0 0
0 ( 1 - 7 3 ) 0
h c