Lucent Technologies MPB-33

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

CONGRATULATIONS!

In selecting this Lennox B-Vent Gas Appliance you have chosen the ﬁ nest and most

dependable ﬁ replace to be found anywhere. A beautiful, prestigious, alternative to a

wood burning ﬁ replace. Welcome to a Family of tens of thousands of satisﬁ ed Lennox

Fireplace Owners.

Please read and carefully follow all of the instructions found in this manual. Please pay

special attention to the safety instructions provided in this manual. The Homeowner's

Care and Operation Instructions included here will assure that you have many years of

dependable and enjoyable service from your Lennox product.

INTRODUCTION

Installation must conform to local codes. In

the absence of local codes, installation must

comply with the current National Fuel Gas Code,

ANSI Z223.1 (NFPA 54). (In Canada, the current

CAN/CGA B149 installation code). Electrical

wiring must comply with local codes. In the

absence of local codes, installation must be in

accordance with the National Electrical Code,

NFPA 70 - (latest edition). (In Canada, the current

CSA C22.1 Canadian Electric Code).

TABLE OF CONTENTS

Safety & Warning Information ..........Page 2

Introduction ......................................Page 3

General Information ..........................Page 3

Operation/Care of Your Appliance .....Page 4

Variable Flame Adjustment ................Page 4

Outside Combustion Air Control .......Page 5

Manual Limit Switch .........................Page 6

Maintenance Schedule ......................Page 7

Maintenance ......................................Page 8

Front Glass Enclosure Panel,

Removal and Installation ...............Page 8

Burner Adjustments ..........................Page 9

Millivolt Appliance Checkout .............Page 9

Electronic Appliance Checkout ..........Page 9

Logs, Rockwool, Vermiculite &

Volcanic Stone Placement .............Page 10

Wiring Diagrams ...............................Page 15

Warranty ...........................................Page 15

Replacement Parts ............................Page 15

Product Reference Information .........Page 15

Accessory Components ....................Page 16

Lighting Instructions – Millivolt ........Page 20

Lighting Instructions – Electronic .....Page 22

Troubleshooting Guide – Millivolt .....Page 24

Troubleshooting Guide – Electronic ..Page 24

Replacement Parts List .....................Page 26

The millivolt appliances are designed to operate

on either natural or propane gas. A millivolt

gas control valve with piezo ignition system

provides safe, efﬁ cient operation. External

electrical power is required to operate the

optional electrically powered components, if

installed. Electrical power must be wired during

appliance installation.

The electronic appliances are designed to

operate on either natural or propane gas. An

electronic intermittent pilot system provides

safe, efﬁ cient operation. External electrical

power is required to operate these units.

These appliances comply with National Safety

Standards and are tested and listed by OMNI-

Test Laboratories, Inc. (Report No. 116-F-36-5)

to ANSI Z21.50 (in Canada, CSA 2.22), and

CAN/CGA-2.17-M91 in both USA and Canada,

as vented gas ﬁ replaces.

GENERAL INFORMATION

Note: Installation and repair should be

performed by a qualiﬁ ed service person. The

appliance should be inspected annually by a

qualiﬁ ed professional service technician. More

frequent inspections and cleanings may be

required due to excessive lint from carpeting,

bedding material, etc. It is imperative that the

control compartment, burners and circulating air

passage ways of the appliance be kept clean.

S'assurer que le brùleur et le compartiment des

commandes sont propres. Voir les instructions

d'installation et d'utilisation qui accompagnent

l'appareil.

Provide adequate clearances around air open-

ings and adequate accessibility clearance for

service and proper operation. Never obstruct

the front openings of the appliance.

Due to high temperatures the appliance should

be located out of trafﬁ c and away from furniture

and draperies. Locate furniture and window

coverings accordingly.

Millivolt Models with

Manually-Modulated Gas Valve

Natural Gas Propane Gas

Model Input Rate

(BTU/HR) Input Rate

(BTU/HR)

MPB3328 13,500 to 17,500 13,500 to 17,500

MPB3530 16,000 to 20,000 16,500 to 20,000

MPB4035 24,000 to 30,000 22,300 to 28,000

MPB4540 24,750 to 31,000 23,000 to 29,000

Table 1

Electronic Models -

Electronic models have a ﬁ xed rate gas valve.

Input of electronic models is shown in Table 2:

Electronic Models with

Fixed-Rate Gas Valve

Natural Gas Propane Gas

Model Input Rate

(BTU/HR) Input Rate

(BTU/HR)

MPB3328 17,500 17,500

MPB3530 20,000 20,000

MPB4035 30,000 28,000

MPB4540 31,000 29,000

Table 2

These appliances are designed to operate on

natural or propane gas only.

Input of millivolt models is variable. These rates

are shown in Table 1:

Maximum manifold pressure is 3.5 in. w.c. (0.87

kPa) for natural gas and 10 in. w.c. (2.49 kPa)

for LP/Propane gas.

Do not use these appliances if any part has been

under water. Immediately call a qualiﬁ ed, profes-

sional service technician to inspect the appliance

and to replace any parts of the control system and

any gas control which have been under water.

Ne pas se servir de cet appareil s'il a été plongé

dans l'eau, complètement ou en partie. Appeler

un technicien qualiﬁ é pour inspecter l'appareil et

remplacer toute partie du système de contrôle et

toute commande qui ont été plongés dans l'leau.

Test gauge connections are provided on the front

of the millivolt gas control valve (identiﬁ ed OUT

for the manifold side and IN for inlet pressure. A

1/8" NPT test gauge connection is provided on the

electronic gas control valve adjacent to the outlet

to the main burner.

Minimum inlet gas pressure to these appliances is

5.0 inches water column (1.24 kPa) for natural gas

and 11 inches water column (2.74 kPa) for propane

for the purpose of input adjustment.

Maximum inlet gas supply pressure to these appli-

ances is 10.5 inches water column (2.61 kPa) for

natural gas and 13.0 inches water column (3.23

kPa) for propane.

Table 3 shows the units' oriﬁ ce size for the

elevations indicated.

Burner Oriﬁ ce Sizes

Elevation 0-4500 feet ( 0-1372 meters)

Models NaturalGas

drill size (inches) Propane Gas

drill size (inches)

MPB-3328 #47 (.0785") *

39L66 •

1.2mm (.048")*

99K78 •

MPB-3530 #44 (.086")*

60J80 •

#55 (.052")*

19L52 •

MPB-4035 #37 (.104")*

24M10 •

1/16"

(.0625")*

21L01 •

MPB-4540 #36 (.1065")*

18L40 •

#52 (.0635")*

37G00 •

Table 3 * Standard size installed at factory

• Part /Cat. Number