4
Model Identification
Door Color
W = White
G = Gray
Cabinet Size
A = 20" x 24" x 56”
B = w/Coil Cavity, 20” x 24” x 76”
Electrical Code
A = 1PH, 60 Hz, 120 VAC
Heating Capacity
Input, BTUH (000)
Application
M = Manufactured Home
Furnace Series
Fuel, Type of Combustion
G = Gas, Direct Vent, Pilot Burner
Natural or Forced Draft
M = Gas, HSI, Forced Draft
B = Gas, Gun Burner
S = Oil, Gun Burner
M 1 G H - 056 A - BW
Comfort Model
H = Heating
A = Heating, A/C Ready
B = A/C Ready, 3 Ton
C = A/C Ready, 4 Ton
D = A/C Ready, 5 Ton
INTRODUCTION
This service manual is designed to be used in conjunction with
the installation manual provided with each furnace.
The downflow sealed combustion furnaces illustrated in this
service manual represent the very latest in high efficiency gas
furnace technology. Certain controls within the furnace
consist of highly sophisticated electronic components which
are not user serviceable. It is essential that only competent,
qualified, service personnel attempt to install, service, or
maintain this product.
This Service manual was written to assist the professional
HVAC service technician to quickly and accurately diagnose
and repair most malfunctions of this product.
This service manual covers standing pilot and hot surface
ignition gas burner models. The overall operation of both of
these models is essentially the same, with the exception of
certain controls which may be unique to each model.
This manual will deal with all subjects in a general nature (i.e.
all text will pertain to all models) unless that subject is unique
to a particular model or family, in which case it will be so
indicated.
It will be necessary for you to accurately identify the unit you
are servicing, so you may be certain of approved diagnosis
and repair. (See Unit Identification, Below)
This manual was prepared by the senior Technical Service
Department and the Communications Department.
The information contained in this manual is intended for use
by a qualified service technician who is familiar with the safety
procedures required in installation and repair and who is
equipped with the proper tools and testing instruments.
Installations and repairs made by unqualified persons can
result in hazards subjecting the unqualified person making
such repairs to the risk of injury or electrical shock which can
be serious or even fatal not only to them, but also to persons
being served by the equipment.
If you install or perform service on equipment, you must
assume responsibility for any bodily injury or property dam-
age which may result to you or others. We will not be
responsible for any injury or property damage arising from
improper installation, service, and/or service procedures.
WARNING:
!
Serial No. Identification
Model Series
M 1 G 9807 - 05432
Production
Year/Month
Production Code