Lennox MPGA 100 B4 User Manual

AFFIX LABEL HERE
INSTALLATION AND SERVICING INSTRUCTIONS
UPFLOW, DOWNFLOW OR HORIZONTAL GAS-FIRED
NON-CONDENSING
WARM AIR FURNACE
Issue 0240
TABLE OF CONTENTS
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Furnace Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Location/Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Air for Combustion & Ventilation . . . . . . . . . . . . . . . . . . . . . . . . 8
Ducting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Gas Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Start-Up Operation & Checkout . . . . . . . . . . . . . . . . . . . . . . . . . 18
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Servicing The Furnace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Trouble Shooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
Installation and service must be performed
by a qualified installer, service agency or
the gas supplier. Installation by an
unqualified person may lead to equipment
damage and/or a hazardous condition
which may cause bodily injury and harm
and, as such, at the sole discretion of the
manufacturer, the entire warranty may be
voided and be of no further force and
effect.
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Extinguish any open flame.
• Do not touch any electrical switch; do
not use any phone in your building.
• Immediately call your gas supplier from
a neighbor's phone. Follow the gas
supplier's instructions.
• If you cannot reach your gas supplier,
call the fire department.
20541501 Issue 240 Page 1 of 26

Lennox MPGA 100 B4 Specifications

General

Brand	Lennox
Model	MPGA 100 B4
Category	Furnace
Language	English