Lennox International Inc. MERIT PLUS MPB3530CNM-B - Manual (Page 12)

12
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT PLUS ® B-VENT GAS FIREPLACES (MPB33/35/40/45) • INSTALLATION INSTRUCTIONS
TEST ALL CONNECTIONS FOR GAS LEAKS
(FACTORY AND FIELD)
Turn on gas supply and test for gas leaks,
using a gas leak test solution (also referred to
as bubble leak solution).
Note: Using a soapy water solution is an
effective leak test solution but it is not
recommended, because the soap residue
that is left on the pipes/fi ttings can result in
corrosion over time.
A. Light the appliance (refer to the
lighting instructions label in the control
compartment or in the Care and Operation
Instructions manual).
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 (off/pilot/on) to the
“OFF” position (millivolt units), or turn the
receiver, remote control or control switch to
the “OFF” position (electronic units). Either
tighten or refasten the leaking connection,
then retest as described above.
C. When the gas lines are tested and
leak free, be sure to rinse off the leak
testing solution.
6. If wall-mounted ON/OFF control 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 16.
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
er
G -
d
n
u
or
G
* Wall-mounted
ON/ OFF Blower
Switch or Variable
Speed Control Switch.
Blower
eti
h
W -
l
art
u
e
N 120 VAC - Black
Green
Ground
Screw
White
Green Neutral
Side of
Receptacle
Hot
Side of
Receptacle
Red Black
Figure 17: Junction Box Wiring
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.
STEP 6. CONNECTING GAS LINE
Make gas line connections. All codes require
a shut-off valve mounted in the supply line.
The orientation of the shut-off valve should
face the front (see Figure 19). Figure 18
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.
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 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 18 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.
STEP 5. WIRING OPTIONAL FORCED
AIR BLOWER KIT
FBK-100, FBK-200, and FBK-250 Kits
(See Figure 17)
An electrical outlet box is provided for the
installation of the FBK-100, FBK-200 and
FBK-250 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.
Note: The tab connecting the two receptacles
of the outlet box must be broken in the
FBK-100 and FBK-200 blower kit applications
(see Figure 17).
The gas control valve is located in the lower
control compartment.
To access the valve, open the control
compartment access panel. Actuate the
spring loaded magnetic catches securing the
panel. First, gently depress the upper right
top corner of the panel until the magnet catch
"pops" the door free. Then, gently pulling the
panel forward, disengage the left magnet
catch and allow the panel to swing down to
open.
The control valves have a 3/8" (10 mm)
NPT thread inlet and outlet side of the valve
(refer to Figures X [Electronic] and Figure x
[Millivolt] on Page X).
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.
WARNING
Never use an open fl ame to
check for leaks.