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USER’S, MAINTENANCE 

and 

SERVICE INFORMATION 

MANUAL

3   T H R U   1 2 . 5   TO N

S I N G L E   PA C K A G E

A I R   C O N D I T I O N E R

G A S / E L E C T R I C

&   E L E C T R I C / E L E C T R I C

66386-YUM-D-0912

CONTENTS

SAFETY INFORMATION . . . . . . . . . . . . . . . .  2

FOR YOUR SAFETY  . . . . . . . . . . . . . . . . . . . . . . 2

SYSTEM OPERATION. . . . . . . . . . . . . . . . . .  2

THERMOSTATS . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INTERMITTENT IGNITION DEVICE  . . . . . . . . . . 2
OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . 3

EXPLAIN UNIT FUNCTION . . . . . . . . . . . . . .  4

GENERAL MAINTENANCE. . . . . . . . . . . . . .  4

HEATING SYSTEM INSPECTION . . . . . . . . . . . . 4
AIR FILTERS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
BLOWER ASSEMBLY  . . . . . . . . . . . . . . . . . . . . . 5
MOTORS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
CONDENSER COIL  . . . . . . . . . . . . . . . . . . . . . . . 6
REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

TROUBLESHOOTING . . . . . . . . . . . . . . . . . .  6

BEFORE CALLING A SERVICE TECHNICIAN: . . 6

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

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 liquids 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 in your building.

Leave the building immediately.

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.

- Installation and service must be per  formed by a 

qualified installer, service agency or the gas 
supplier.

®  

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