Table Of Contents; Safety And Your Fireplace - Lennox Hearth Products MERIT PLUS Care And Operation Instructions Manual

LENNOX HEARTH PRODUCTS • MERIT PLUS
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 fireplace.
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).
SAFETY GUARD
FREE
•
The Lennox ® SAFETY GUARD protects against severe
burns and injuries by preventing direct contact
with the front glass surface of your fireplace.
To receive your FREE SAFETY GUARD, call 1-800-655-2008, or visit
t hProducts.com
www.LennoxHear
NOTE: Safety Guards may not be available for some older models that
are no longer in production.

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
Operation and Care of Your Appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Gas Controls/Control Compartment Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Variable Flame Height Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Front Glass Enclosure Panel, Removal and Installation . . . . . . . . . . . . . . . . . . 11
Install Volcanic Stone, Glowing Embers, and Logs . . . . . . . . . . . . . . . . . . . . . 12
Burner Flame Appearance and Sooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Burner Flame Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Millivolt Appliance Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Electronic Appliance Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Ordering Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Product Reference Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Accessory Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Maintenance Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Lighting Instructions - Millivolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Lighting Instructions - Electronic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Troubleshooting Guide - Millivolt Gas Control System . . . . . . . . . . . . . . . . . . . 28
Troubleshooting Guide - Electronic Gas Control System . . . . . . . . . . . . . . . . . 29
Replacement Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2
DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • CARE AND OPERATION INSTRUCTIONS
®
OFFER
•
(Owner Resources/Safety).
Safety and Your
Fireplace
All parts of your Lennox
Hearth Products fireplace
get EXTREMELY HOT!
 To prevent severe burns and injuries, install
a screen or physical barrier to prevent direct
contact with the glass.
To order a FREE Lennox
your fireplace, see details at left.
 Follow the safety instructions below
and be sure everyone in your household
understands this burn hazard:
• The surfaces on your fireplace get
EXTREMELY HOT!
• The glass on the front
of the fireplace reaches
EXTREMELY HIGH
temperatures and can
cause severe burns if touched.
• Keep children away from an operating
fireplace. Closely supervise children in
any room where a fireplace is operating
to prevent contact with glass.
• Keep clothing, furniture,
gasoline, and other
flammable liquids away
from the fireplace.
• Even after the gas is turned off, fireplace
surfaces remain extremely hot.
 Be sure to attach the enclosed Safety-in-
Operation Warnings where you turn on your
fireplace, to help remind everyone of the
dangers associated with high temperatures
(see page 5).
 Read Important Safety Information on
page 4.
SAFETY GUARD for
®