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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX MERIT
®
SERIES B-VENT GAS FIREPLACES • 42" LMBV MODELS • INSTALLATION INSTRUCTIONS
Figure 11
Step 5. Field Wiring – Refer to Section A for
millivolt appliances and Section B for electronic
appliances.
A. Millivolt Wiring – The gas valve has been set
in place and has been pre-wired at the factory. No
additional wiring is required unless the optional
wall switch or optional remote control kit is to
be installed. Locate the optional wall switch or
optional remote control in the desired location
and connect the millivolt wire (see Figure 11 ).
CAUTION: DO NOT CONNECT THE WALL
SWITCH TO A 120V POWER SUPPLY.
Note: Optional wall switch not supplied. If the
optional wall switch is not installed, the ends of
the 15' coiled wire must be connected with a wire
nut (not supplied) for the appliance to operate.
Figure 12
Step 6. Connecting Gas Line – Make gas line
connections. All codes require a shut-off valve
mounted in the supply line. Figure 15 illustrates
two methods for connecting the gas supply. The
ex-line method is acceptable in the U.S., how-
ever, Canadian requirements vary depending on
locality. Installation must be in compliance with
local codes. The gas control valve is located in
the lower control compartment. To access the
valve remove the refractory access panel and
set aside (Figure 13 ).
B. Electronic Wiring – The electronic appliance
must be connected to the main power supply.
To install:
1. Route a 3-wire 120V 60Hz power supply to
the appliance junction box and ground. (See
Figures 12 and 14 ).
IMPORTANT: Ground lead must be connected
to the green screw located on the outlet box.
See Figure 12 . Failure to do so will result in a
potential safety hazard. The appliance must
be electrically grounded in accordance with
local codes or, in the absence of local codes,
the National Electrical Code, ANSI/NFPA
70-(latest edition). (In Canada, the current
CSA C22-1 Canadian Electrical Code.)
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 tted with a 1/2" x 3/8" (13
mm x 10 mm) NPT fitting. Both the millivolt
and electronic models are tted with a 3" (76
mm) long nipple, 3/8" NPT. Plan the connec-
tions accordingly.
Secure all joints tightly using appropriate
tools and sealing compounds (ensure propane
resistant compounds are used in propane
applications).
Turn on gas supply and test for gas leaks, us-
ing a gas leak test solution (also referred to as
bubble leak solution).
Note: Using a soapy water solution (50% dish
soap, 50% water) is an effective leak test solu-
tion but it is not recommended, because the
soap residue that is left on the pipes/fittings
can result in corrosion over time. Never use
an open ame to check for leaks.
A. Light the appliance (refer to the lighting
instructions label in the control compartment
or in the Care and Operation Instructions).
B. Brush all joints and connections with the gas
leak test solution to check for leaks. If bubbles
are formed, or gas odor is detected, turn the
gas control knob to the “OFF” position. Either
tighten or refasten the leaking connection and
retest as described above.
C. When the gas lines are tested and leak free,
be sure to rinse off the leak testing solution.
D. When the gas lines are tested and leak free,
observe the individual tongues of ame on
the burner. Make sure all ports are open and
producing ame evenly across the burner. If
any ports are blocked, or partially blocked,
clean out the ports.
Figure 13
Refractory
Access Panel
SIT Valve Shown
Gas Controls
on Valve
Piezo
Ignitor
2. Locate and install a low voltage (24V) wall
switch (not supplied) in the desired location.
Connect the low voltage wire to this switch
(see Figure 12 ).
3. After wiring is complete, replace the appliance
junction box cover and secure with the hex head
screws previously removed.
Maximum overall height of the vent system and
appliance should not exceed 40 feet (12.19 m).
Install the B-vent system in accordance with
the vent manufacturer's instructions.
CAUTION: THIS APPLIANCE CANNOT BE
VENTED HORIZONTALLY.
Note: Refer to the vent manufacturers instal-
lation instructions for variations of venting
techniques. If common venting of several units
is contemplated, it should be discussed with an
architect and the local Building Department.
Install the B-vent system in accordance with
the vent manufacturer's instructions.
SIT Millivolt Wiring Diagram
* For Wall Switch Attachment Only.
If any of the original wire as supplied must be replaced, it
must be replaced with Type AWM 200°C – 18 GA. wire.
Thermopile
TH
TP
TH
TP
Limit
Switch
Damper Switch
BK
BK
BK
BK
WHT
*
1. If any of the original wire as supplied must be replaced,
1. it must be replaced with Type AWM 200°C – 18 GA. wire.
2. 120V, 60Hz – Less than 3 amps.
BK
Junction Box
Transf.
120 V.
24 V
Factory Wired
Field Wired
BL
Electronic Wiring Diagram (Honeywell)
(Optional ON/OFF Switch Wiring)
R
BK
BL
To Opposite Side
G
W
OPT. ACCESSORY
SWITCH
120
VAC.
BK
LIMIT
SWITCH
W
Gas Valve
B
BL
OPTIONAL
ON/OFF SWITCH
OR
WALL SWITCH
R
R
IGNITER
CONTROL
PILOT
ASSEMBLY
Break
Off Tab
DAMPER
SWITCH
BK
BK
WHT BK
BK
SIT Millivolt Wiring Diagram
* For Wall Switch Attachment Only.
If any of the original wire as supplied must be replaced, it
must be replaced with Type AWM 200°C – 18 GA. wire.
Thermopile
TH
TP
TH
TP
Limit
Switch
Damper Switch
BK
BK
BK
BK
WHT
*
1. If any of the original wire as supplied must be replaced,
1. it must be replaced with Type AWM 200°C – 18 GA. wire.
2. 120V, 60Hz – Less than 3 amps.
BK
Junction Box
Transf.
120 V.
24 V
Factory Wired
Field Wired
BL
Electronic Wiring Diagram (Honeywell)
(Optional ON/OFF Switch Wiring)
R
BK
BL
To Opposite Side
G
W
OPT. ACCESSORY
SWITCH
120
VAC.
BK
LIMIT
SWITCH
W
Gas Valve
B
BL
OPTIONAL
ON/OFF SWITCH
OR
WALL SWITCH
R
R
IGNITER
CONTROL
PILOT
ASSEMBLY
Break
Off Tab
DAMPER
SWITCH
BK
BK
WHT BK
BK