19
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT PLUS
®
B-VENT GAS FIREPLACES (MPB33/35/40/45) • CARE AND OPERATION INSTRUCTIONS
Parts will be shipped at prevailing prices at
time of order.
When ordering repair parts, always provide:
1.
The model number of the appliance.
2.
The serial number of the appliance.
3.
The part number.
4.
The description of the part.
5.
The quantity required.
6.
The installation date of the appliance.
If you encounter any problems or have any
questions concerning the installation or
application of this system, please contact your
dealer or distributor.
LENNOX HEARTH PRODUCTS
1508 Elm Hill Pike, Suite 108
Nashville, TN 37210
visit us at www.LennoxHearthProducts.com
1-800-
655-2008
PRODUCT REFERENCE INFORMATION
We recommend that you record the important
reference information about your fireplace in
the space provided below.
Please call Lennox Hearth Products for the
phone number of your nearest Lennox Hearth
Products dealer who will answer your questions
or address your concerns.
Fireplace Model Number ________________________________________________
Fireplace Serial Number _________________________________________________
Date Installed _________________________________________________________
Type of Gas Used in Fireplace ____________________________________________
Dealer Name _________________________________________________________
TP-TH
TP
TH
APPLIANCE- MOUNTED
ON/OFF SWITCH
(OPTIONAL)
BK/W(1)
BK/W(1)
WALL-MOUNTED ON/OFF SWITCH (OPTIONAL)
THERMOSTAT (OPTIONAL)
JUNCTION BOX
BLACK
W
GR
120
V
AC
WALL MOUNTED CONFIGURATION FOR FAN SWITCH (OPTIONAL)
BK
R
WIRING DIAGRAM MILLIVOLT GAS VALVES
THERMOPILE
GAS VALVE
FAN
(OPTIONAL)
If any of the original wire as supplied must be replaced,
it must be replaced with Type AWM105
°
C – 18 GA. wire.
Thermopile
HT
PT
HT
PT
*TWIST WIRES “A” AND “B” TOGETHER TO OPERATE UNIT
SOLELY BY MANIPULATING THE GAS VALVE CONTROL KNOB;
OR CONNECT WIRES TO OPTIONAL ON/OFF SWITCH OR WALL
SWITCH OR REMOTE CONTROL RECEIVER TO OPERATE UNIT.
*OPTIONAL ON/OFF SWITCH,
WALL SWITCH, OR REMOTE
CONTROL RECEIVER
A
B
HC
TI
WS
TI
MI
L
WT
BK
BK
BK
Schematic Representation Only
Figure 19 - Wiring Diagram - Electronic Gas Valves
P/N 580491-01
JUNCTION BOX
120V AC
REMOTE RECEIVER
ON/OFF SWITCH
WALL SWITCH
LIMIT SWITCH
B-VENT MODELS
ONLY
AC/DC
POWER
ADAPTOR
HOT
NEUTRAL
OPTIONAL
GROUND
BATTERY HOLDER
DFC WIRE HARNESS
SPARK WIRE CABLE
PILOT GROUND WIRE
PILOT
SENSOR
CABLE
HOOD
IGNITER ROD
FLAME SENSOR
PILOT TUBE
CPI
SWITCH
OFF (O) = INTERMITTENT PILOT MODE
ON (-) = STANDING PILOT MODE
PROFLAME DFC BOARD
PROFLAME VALVE
ELECTRONIC PILOT ASSEMBLY
B = BLACK
BR = BROWN
GY = GRAY
PU = PURPLE
R = RED
BL = BLUE
G = GREEN
O = ORANGE
W = WHITE
Y = YELLOW
WIRING COLOR CODE
B
B
B
R
R
W
W
B
B
B
B
BL
BL
G
G
O
Y
Y
R
R
Y
W
G
G
O
SCHEMATIC REPRESENTATION ONLY
CAUTION: LABEL ALL WIRES PRIOR TO
DISCONNECTION WHEN SERVICING
CONTROLS. WIRING ERRORS CAN
CAUSE IMPROPER AND DANGEROUS
APPLIANCE OPERATION.
ATTENTION: AU MOMENT DE
L’ENTRETIEN DES COMMANDES,
ÉTIQUETEZ TOUS LES FILS AVANT
DE LES DÉBRANCHER. DES
ERREURS DE CáBLAGE PEUVENT
ENTRAîNER UN FONCTIONNEMENT
INADÉQUAT ET DANGEREUX.
ORDERING REPLACEMENT PARTS
A complete parts list is found at the end of
this manual. Use only parts supplied from the
manufacturer.
With proper care and maintenance, your
appliance will provide many years of enjoyment.
If you should experience any problem, first refer
to the troubleshooting guide in this manual. If
problem persists, contact your Lennox Hearth
Products dealer or distributor.
Normally, all parts should be ordered through
your Lennox Hearth Products distributor or dealer.
WIRING DIAGRAMS
Wiring diagrams are provided here for reference
purposes only. This information is also provided
on schematics attached directly to the appliance
on a pullout panel located within the control
compartment.
Figure 18 - Wiring Diagram -
Millivolt Gas Valves
BLOWER CONTROL CIRCUIT WIRING
120V, 60HZ, 1PH
Factory Wired
Ground
Field Wired
Junction Box
Tab Intact
Tab
Broken
Plug blower
into this
receptacle
n e
e r
G -
d n
u o r
G
* Wall-mounted
ON/ OFF Blower
Switch or Variable
Speed Control Switch.
Blower
e t i
h
W - l
a r t
u e
N 120 VAC - Black
Green
Ground
Screw
Whit
e
Gree
n
Neutral
Side of
Receptacle
Hot
Side of
Receptacle
Red
Black
Hot
Side of
Receptacle
Neutral
Side of
Receptacle
MILLIVOLT GAS VALVES
