2
LENNOX HEARTH PRODUCTS • MERIT PLUS
®
B-VENT GAS FIREPLACES (MPB33/35/40/45) • CARE AND OPERATION INSTRUCTIONS
Safety and
Your Fireplace
To prevent severe burns and injuries, install
a screen or physical barrier to prevent direct
contact with the glass.
To order a FREE Lennox
®
SAFETY GUARD
for your fi replace, see details at left.
Follow the safety instructions below
and be sure everyone in your household
understands this burn hazard:
• The surfaces on your fi replace get
EXTREMELY HOT!
• The glass on the front
of the fi replace reaches
EXTREMELY HIGH
temperatures and can
cause severe burns if touched.
• Keep children away from an operating
fi replace. Closely supervise children in
any room where a fi replace is operating
to prevent contact with glass.
• Keep clothing, furniture,
gasoline, and other
fl ammable liquids away
from the fi replace.
• Even after the gas is turned off, fi replace
surfaces remain extremely hot.
Be sure to attach the enclosed
Safety-in-
Operation Warnings
where you turn on your
fi replace, to help remind everyone of the
dangers associated with high temperatures
(see
Page 5
).
Read
Important Safety Information
on
Page 4
.
All parts of your Lennox
Hearth Products fi replace
get EXTREMELY HOT!
Table of Contents
Safety and Your Fireplace
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
Important Safety Information
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
Attaching Safety-in-Operation Warnings
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
Appliance Installation, Service, and Maintenance Notices . . . . . . . . . . . . . . . . . 6
Appliance Operation Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
BTU Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Gas Pressure Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Orifi ce Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Burn-In Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Operation and Care of Your Appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Gas Controls/Control Compartment Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Variable Flame Height Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Vent Operation Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Replacing The Safety Limit Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Front Glass Enclosure Panel, Removal and Installation . . . . . . . . . . . . . . . . . . 11
Install Volcanic Stone, Glowing Embers, and Logs . . . . . . . . . . . . . . . . . . . . . 12
Burner Flame Appearance/Sooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Burner Flame Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Millivolt Appliance Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Ordering Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Product Reference Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Optional Remote Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Accessory Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Maintenance Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Lighting Instructions – Millivolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Troubleshooting Guide – Millivolt Gas Control System . . . . . . . . . . . . . . . . . . 25
Replacement Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
•
FREE
SAFETY
GUARD
OFFER
•
The Lennox
®
SAFETY GUARD
protects against
severe burns and injuries by preventing direct contact
with the front glass surface of your fi replace.
To receive your FREE
SAFETY GUARD
, call
1-800-655-2008
or visit
www.LennoxHearthProducts.com
(> Owner Resources > Safety First).
Note: Safety Guards may not be available for some
older models that are no longer in production.
Thank you for your purchase. We appreciate your business!
Please carefully read and follow all instructions in this manual.
Pay special attention to all warnings and safety information.
Following these safety, care, and operation instructions will help ensure
many years of dependable and enjoyable service from your fi replace.
Register your product online today!
To help us keep you up-to-date on product information and offers,
please take a few moments to register your product online at:
www.LennoxHearthProducts.com
> Owner Resources > Product
Registration
