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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT
®
SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • CARE AND OPERATION INSTRUCTIONS
TP-TH
TP
TH
OPTIONAL APPLIANCE-
MOUNTED ON/OFF
SWITCH
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)
JUNCTION BOX
W
GR
BK
120 VAC
BK
R
TRANSFORMER 3V
INTERMITTENT ELECTRONIC WIRING DIAGRAM
BROWN
BROWN
BLACK
BATTERY BACK-UP
TO WALL
SWITCH, FRS
OR THERMOSTAT
BLACK (SENSOR)
BLACK (IGNITER)
SPARK TO PILOT IGNITER
IGNITER MODULE
3V
RED
BK
W
GR
OPTIONAL BLOWER
SWITCH
FAN
(OPTIONAL)
PILOT
IN
OUT
VENT
LO
HI
TH
TP
TH
TP
IN
ORANGE (THTP)
BLACK (TP)
GREEN (TH)
Figure 16
Figure 17
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.
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 PEU-VENT
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 appli-
ance will provide many years of enjoyment. If
you should experience any problem, first refer
to the troubleshooting guide in this manual.
If the problem persists, contact your Lennox
Hearth Products dealer or distributor.
Order parts through your Lennox Hearth Prod-
ucts distributor or dealer. Parts will be shipped
at prevailing prices at time of order.
When ordering parts, provide the following
information:
1. Appliance model number.
2. Appliance serial number.
3. Part number.
4. Part description.
5. Quantity required.
6. Appliance installation date.
PRODUCT REFERENCE INFORMATION
Model Number ________________________________________________________
Serial Number ________________________________________________________
Date Installed _________________________________________________________
Gas Type Used ________________________________________________________
Dealer Name _________________________________________________________
Please call Lennox Hearth Products for the
phone number of your nearest LHP dealer,
who will answer your questions or address
your concerns.
LENNOX HEARTH PRODUCTS
1508 Elm Hill Pike, Suite 108
Nashville, TN 37210
Visit us at www.Lennox.com
1-800-9-LENNOX
If you encounter any problems or have any
questions concerning the installation or ap-
plication of this system, please contact your
dealer or distributor.
PRODUCT REFERENCE
INFORMATION
We recommend that you record the important
reference information about your fireplace in
the space provided below.