26
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT PLUS
®
DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
Note: Remote receiver should be located
in the wall, or if installed in the control
compartment, pulled all the way forward and
completely to the left or right against the
corner posts.
6. If wall-mounted ON/OFF control or
thermostat is to be used, mount it in a
convenient location on a wall near the
fi replace.
7. If an optional control is to be used, wire
it in the low voltage circuit as shown in
Figure 45.
Note: The supplied 15 feet of 2 conductor
wire has one end of each conductor
connected to the gas valve circuit and the
other end of each conductor placed loose
inside the bottom compartment.
8. After the wiring is complete, replace the
cover plate.
120V, 60HZ, 1PH
Factory Wired
Ground
Field Wired
Junction Box
Tab Intact
Tab
Broken
Plug blower
into this
receptacle
n
e
e
r
G
-
dn
u
o
r
G
* Wall-mounted
ON/ OFF Blower
Switch or Variable
Speed Control Switch.
Blower
e
ti
h
W
-
lar
t
u
e
N
120 VAC - Black
Green
Ground
Screw
White
Green
Neutral
Side of
Receptacle
Hot
Side of
Receptacle
Red
Black
Figure 46: Junction Box Wiring
These appliances are equipped with a gas fl ex
line for use (where permitted) in connecting
the unit to the gas line. A gas fl ex line is
provided to aid in attaching the direct vent
appliance to the gas supply. The gas fl ex line
can only be used where local codes permit.
Refer to Figure 47 for fl ex line description.
The fl ex line is rated for both natural and
propane gas. A manual shut off valve is also
provided with the fl ex line.
The gas control valve is located in the lower
control compartment.
To access the valve open the lower control
compartment door (see Figure 48 ) 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 fi replace.
The millivolt control valve has a 3/8 in.
(10 mm) NPT thread inlet port. The electronic
control valve has a 1/2 in. (13 mm) NPT
thread inlet port and is fi tted with a 1/2 in. x
3/8 in. (13 mm x 10 mm) NPT fi tting.
Secure all joints tightly using appropriate
tools and sealing compounds (ensure
propane resistant compounds are used
in propane applications). Optional: Seal
around the gas line to prevent cold air
leakage. Gas line holes and other openings
can be caulked or stuffed with unfaced
fi berglass insulation.
All codes require a shut-off valve mounted
in the supply line. The orientation of
the shut-off valve should face the front.
Figure 47 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.
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.
FBK-250 Blower Kit
(See Figure 46)
An electrical outlet box is provided for the
installation of the FBK-250 forced air blower
kit. Electrical power must be provided to
this box to operate these blowers. Install
the blower kit according to the installation
instructions provided with the kit.
Note: The tab connecting the receptacles of
the outlet box must be broken in FBK-100
and FBK-200 blower kit applications. See
Figure 46.
Step 7. CONNECTING GAS LINE
Make gas line connections. All codes require
a shut-off valve mounted in the supply
line. Figure 47 illustrates two methods for
connecting the gas supply. The fl ex-line
method is acceptable in the U.S., however,
Canadian requirements vary depending on
locality. Installation must be in compliance
with local codes.
Step 6. WIRING—OPTIONAL FORCED
AIR BLOWER KIT
FBK-100 and FBK-200 Kits
(See Figure 46)
An electrical outlet box is provided for
the installation of the FBK-100, FBK-200
forced air blower kits. Electrical power must
be provided to this box to operate these
blowers. Install the blower kits according to
the installation instructions provided with
the kits.
WARNING
Never use an open fl ame to
check for leaks.
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