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5165698-UUM-A-1215

USER’S INFORMATION MANUAL

33” MULTI-POSITION GAS FURNACES 

(Manufactured Housing or 

Modular Home Applications)

MODELS: MG9S SERIES

TABLE OF CONTENTS

CONTACT INFORMATION   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

SAFETY  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTRUCTIONS FOREXAMINING THE 
FURNACE INSTALLATION   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
START-UP AND SHUTDOWN INSTRUCTIONS   . . . . . . . . . . . . . . . . 2

HOW YOUR GAS FURNACE WORKS  . . . . . . . . . . . . . . . . . . . . . . 3
OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
TO TURN OFF THE APPLIANCE  . . . . . . . . . . . . . . . . . . . . . . . . . . 3

FURNACE MAINTENANCE - USER INFORMATION   . . . . . . . . . . . . 4

EXTERNAL AIR FILTERS   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
BLOWER CARE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
MOTOR LUBRICATION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

SERVICE INFORMATION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

TROUBLESHOOTING PROBLEMS . . . . . . . . . . . . . . . . . . . . . . . . .5
FURNACE CONTROL DIAGNOSTICS   . . . . . . . . . . . . . . . . . . . . . .5
FURNACE MAINTENANCE - DEALER/CONTACTOR  . . . . . . . . . .5
REPLACEMENT PARTS LIST  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
WIRING DIAGRAM  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

LIMITED WARRANTY  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

CONTACT INFORMATION

Go to website at www.york.com, then click on “Contact Us” and 
follow the instructions.

Contact us by mail:

Johnson Controls Unitary Products

Consumer Relations

5005 York Drive

Norman, OK 73069

The manufacturer recommends that the user read all sections
of this manual and keep the manual for future reference.

SECTION I: SAFETY

 

This is a safety alert symbol. When you see this symbol on
labels or in manuals, be alert to the potential for personal
injury.

Understand and pay particular attention to the signal words DANGER,
WARNING, or CAUTION. 

DANGER

 indicates an imminently hazardous situation, which, if not

avoided, will result in death or serious injury.

WARNING

 indicates a potentially hazardous situation, which, if not

avoided, could result in death or serious injury.

CAUTION

 indicates a potentially hazardous situation, which, if not

avoided may result in minor or moderate injury. It is also used to alert
against unsafe practices and hazards involving only property damage.

1. The furnace area must be kept clear and free of combustible materi-

als, gasoline and other flammable vapors and liquids.

2. Insulating materials may be combustible. The furnace must be kept

free and clear of insulating materials. The furnace area must be
examined when installed in an attic or other insulated space or when
insulation is added to be sure that the insulation material has been
kept away from the furnace.

3. The furnace needs air for combustion in order to operate properly

and safely. Do not block or obstruct air openings on the furnace, air
openings to the area where the furnace is installed, or spaces
around the furnace.

4. Follow the instructions exactly as shown on the OPERATING

INSTRUCTION LABEL on the furnace or the “START-UP AND
SHUTDOWN INSTRUCTIONS” 
section of this manual when lighting
the furnace or turning the furnace off.

5. Should the gas supply fail to shut off or if overheating occurs, shut

off the gas valve to the furnace before shutting off the electrical sup-
ply.

6. Do not use this furnace if any part has been under water. A flood-

damaged furnace is extremely dangerous. Attempts to use the fur-
nace can result in fire or explosion. A qualified service agency
should be contacted to inspect the furnace and replace all gas con-
trols, control system parts, electrical parts that have been wet or the
furnace if deemed necessary.

7. NEVER. . .Store flammable materials of any kind near your furnace.

Gasoline, solvents, and other volatile liquids should be stored only
in approved containers outside your home. These materials vapor-
ize easily and are extremely dangerous.

8. NEVER . .Store cleaning materials near your furnace. Materials

such as bleaches, detergents, powdered cleansers, etc., can cause
corrosion of the heat exchangers. 

9. NEVER . . . Use the area around your furnace as a storage area for

items which could block the normal flow of air. This flow of air is
required for ventilation of the various furnace components.

 WARNING

FIRE OR EXPLOSION HAZARD - Failure to follow safety warnings
exactly could result in serious injury, death, or property damage.

Do not store or use gasoline or other flammable vapors and liq-
uids in the vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS:

Do not try to light any appliance.

Do not touch any electrical switch; do not use any phone (includ-
ing cell phone) in your building.

Leave the building immediately.

Immediately call your gas supplier from a neighbor’s phone. Fol-
low the gas supplier’s instructions.

If you cannot reach your gas supplier, call the fire department.

Installation and service must be performed by a qualified installer, 

service agency or the gas supplier.

!

Summary of Contents for MG9S Series

Page 1: ...m the furnace 3 The furnace needs air for combustion in order to operate properly and safely Do not block or obstruct air openings on the furnace air openings to the area where the furnace is installe...

Page 2: ...sound without cracks gaps or sagging and has a good seal 5 Examine the furnace casing for obvious signs of deterioration 6 Examine the burner flames to make sure they are in good adjust ment Refer to...

Page 3: ...d any gas control which has been under water OPERATING INSTRUCTIONS 1 STOP Read the safety information above for your protection 2 Set the thermostat to the lowest setting in the heat mode 3 Turn off...

Page 4: ...m as shown in Figure 5 To check clean or replace the air filters you should 1 Follow the instructions to turn off the appliance before servicing 2 Filters that are installed in the return air plenum a...

Page 5: ...ng operation Modulating Fur nace Models Only SLOW AMBER FLASH Normal operation with call for heat RAPID RED FLASHES There is a problem with the operation of this furnace Contact your local dealer cont...

Page 6: ...5165698 UUM A 1215 6 Johnson Controls Unitary Products NOTES...

Page 7: ...een operated with an input rate in excess of the rating plate attached to the product 2 The product has not been allowed to operate without the use of the proper automatic limit control for maximum wa...

Page 8: ...re not covered 10 Damages resulting from failure to perform normal maintenance as shown in installation and servicing instructions or owner s manual 11 Cleaning or replacement of filters nozzles or or...

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