Step 5. Field Wiring; Install Optional Wall Switch; Step 6. Connect To Gas Line - Lennox MERIT Series Installation Instructions Manual

LENNOX MERIT
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.
Step 5. Field Wiring; Install Optional
Wall Switch
Refer to Section A, below, for millivolt appliances
and Section B, below, 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.
SIT Millivolt Wiring Diagram
If any of the original wire as supplied must be replaced, it
must be replaced with Type AWM 105°C – 18 GA. wire.
Limit Switch
Damper
Switch
Thermopile
*
For Wall Switch Attachment Only.
Figure 11
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.
8
(See Figures 12 and 14 ).
SERIES B-VENT GAS FIREPLACES • 36" LMBV MODELS • INSTALLATION INSTRUCTIONS
®
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 ap-
pliance junction box cover and secure with
the hex head screws previously removed.
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 cur-
rent CSA C22-1 Canadian electrical Code.)
Electronic Wiring Diagram (Honeywell)
(Optional ON/OFF Switch Wiring)
1. If any of the original wire as supplied must be replaced,
it must be replaced with Type AWM 200°C – 18 GA.
wire.
2. 120V, 60Hz – Less than 3 amps.
Gas Valve
CONTROL
BK
R
BL
OPT
FAN
BK
WHT BK
OPTIONAL
ON/OFF SWITCH
OR WALL SWITCH
Factory Wired
Figure 12

Step 6. Connect to 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 flex-line method is acceptable
in the U.S., however, Canadian requirements
vary depending on locality. Installation must be
in compliance with local codes. The gas control
valve is located in the lower control compart-
ment. To access the valve remove the refractory
access panel and set aside (Figure 13 ).
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
OPT. ACCESSORY
PILOT SWITCH
ASSEMBLY
BK
120
W
VAC.
G
G
Break
Off Tab
To Opposite Side
Junction Box
W
B Transf.
120 V.
G
24 V
BL
R
BK
BK BK
LIMIT
DAMPER
SWITCH SWITCH
Field Wired
Gas Controls
on Valve
Refractory
Access Panel
SIT Valve Shown
Figure 13
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.
Both the millivolt and electronic models are
fitted with a 3" (76 mm) long nipple, 3/8" NPT.
Plan the connections 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
solution 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 flame to check for leaks.
A. Light the appliance (refer to the lighting
instructions label in the control compartment
or in the Homeowner's 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" posi-
tion. 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 flame on
the burner. Make sure all ports are open and
producing flame evenly across the burner. If
any ports are blocked, or partially blocked,
clean out the ports.
Piezo
Ignitor