Step 6. Optional Blower Kit Wiring; Step 7. Connecting Gas Line - Lennox Hearth Products MPD35ST-NM-B Installation Instructions Manual

Important Note: The gas valve OFF/ON switch
is shown in Figure 46 on Page 26. It is integral
with the gas valve and should be set to the
ON position.
WARNING
Electronic models of these appli-
ances are equipped with a three-
prong (grounding) plug utilized
in connecting the electronic
components to the junction box
in the lower compartment. This
grounding plug provides protec-
tion against shock hazard and
should be plugged directly into
the properly grounded three-
prong receptacle. DO NOT cut
or remove the grounding prong
from the plug.
Ground Wire
Connection
White
(supply)
Black
(supply)
Note: Supply wires may be alternatively con-
nected to the outlet using the screw terminals,
however the black supply wire must be wired to
a terminal that is opposite (across the outlet) the
point where the white supply wire is connected.
Figure 47
Step 6. WIRING - OPTIONAL FORCED AIR
BLOWER KIT
FBK-100, FBK-200 and FBK-250 Kits
(See Figure 49 on page 28 for wiring) -
An electrical receptacle is provided for the instal-
lation of the FBK-100, FBK-200 and FBK-250
forced air blower kits. Electrical power must be
connected to this receptacle in order to operate
these blowers. Install the blower kits according
to the installation instructions provided with the
kits. See Figure 13 on Page 11 showing where
blower should be located on unit.
Remove the carton support from
the control compartment before
operating the appliance.
and Cover Plate Installation
Outlet Receptacle
View Of Left
Bottom Corner Of Unit
Field-provided Metal Junction Box
Cover Plate With Screw
Junction Box
Bipolar
knock-out (2
Terminal
places each side)
Screw
Press snap
bushing into the
knock-out for
control switch
wires.
Figure 48
TEST ALL CONNECTIONS FOR GAS LEAKS
(FACTORY AND FIELD):
Never use an open flame to
check for leaks.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
CAUTION
Receptacle, Junction Box
Junction Box
latching magnet
not shown
Fireplace
Side
WARNING

Step 7. CONNECTING GAS LINE

Make gas line connections. All codes require a
shut-off valve mounted in the supply line. Figure
50 illustrates two methods for connecting the
gas supply. The flex-line method is acceptable
in the U.S., however, Canadian requirements
vary depending on locality. Installation must
be in compliance with local codes. A sediment
trap is recommended in the gas piping within
the home to prevent moisture and debris in the
line from damaging the valve.
These appliances are equipped with a gas flex
line for use (where permitted) in connecting the
unit to the gas line. A gas flex line is provided
to aid in attaching the direct vent appliance to
the gas supply. The gas flex line can only be
used where local codes permit. Refer to Figure
51 for flex line location. The flex line is rated for
both natural and propane gas. A manual shut off
valve is also provided with the flex line.
The gas control valve is located in the lower
control compartment.
To access the valve open the lower control
compartment door (see Figure 51 ) by pushing
in the right top corner of the door. (The door
is hinged at the bottom.) Remove the bottom
compartment door by sliding the hinge pin,
located at the door's left side, to the right until
it disengages from the left corner post hole.
Pull the door diagonally to the left, away from
the fireplace.
The lower control compartment door on the
side opposite the valve lifts on and off.
The millivolt control valve has a 3/8"
(10 mm) NPT thread inlet port. The electronic
control valve has a 1/2" (13 mm) NPT thread
inlet port and is fitted with a 1/2" x 3/8" (13 mm x
10 mm) NPT fitting.
Secure all joints tightly using appropriate
tools and sealing compounds (ensure propane
resistant compounds are used in propane
applications).
All codes require a shut-off valve mounted
in the supply line. The orientation of the
shut-off valve should face the front. Figure
50 illustrates two methods for connecting the
gas supply. A sediment Trap is recommended
to prevent moisture and debris in the gas line
for damaging the valve.
27