York 66441-YUM-D-1011 User Manual

CONTENTS

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

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

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

THERMOSTATS . . . . . . . . . . . . . . . . . . . . . . . . . .2

INTERMITTENT IGNITION DEVICE . . . . . . . . . . . 2

INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . 3

TO SHUT DOWN THE FURNACE: . . . . . . . . . . . 3

TO LIGHT THE FURNACE: . . . . . . . . . . . . . . . . . 3

VENT SAFETY SYSTEM: . . . . . . . . . . . . . . . . . . 3

100% SHUT OFF: . . . . . . . . . . . . . . . . . . . . . . . . 3

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

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

HEATING SYSTEM INSPECTION . . . . . . . . . . . . 4

BURNER AND PILOT CHECK . . . . . . . . . . . . . . . 4

CLEANING BURNERS . . . . . . . . . . . . . . . . . . . . . 5

CLEANING FLUE PASSAGES AND

HEATING ELEMENTS . . . . . . . . . . . . . . . . . . . 5

AIR FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

ECONOMIZER . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

BLOWER ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . 6

BLOWER SHAFT BEARING 6

MOTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

CONDENSER COIL . . . . . . . . . . . . . . . . . . . . . . . . 7

REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

®

USER’S, MAINTENANCE

and

SERVICE INFORMATION

MANUAL

15 THRU 25 TON

SINGLE PACKAGE

AIR CONDITIONER

GAS/ELECTRIC

& ELECTRIC/ELECTRIC

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

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . 7

BEFORE CALLING A SERVICE PERSON: . . . . . 7

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 performed by
a qualified installer, service agency or the gas
supplier.

66441-YUM-D-1011

66441-YUM-D-1011

SAFETY INFORMATION

FOR YOUR SAFETY

• Make sure that the furnace area is clear and free of com­bustible materials, gasoline and other flammable vapors
and liquids.

• Be sure the furnace is free and clear of insulating mate­rial. Examine the furnace area after installation of the fur­nace or the installation of additional insulation. Some
types of insulation are combustible.

• For proper operation of this furnace, air for combustion
and ventilation is required. Make sure that these open­ings are not obstructed.

• For lighting or shutting down this furnace, refer to the
lighting instructions provided adjacent to the burners and
also located in this manual.

• A blocked vent roll-out switch is provided in the burner
compartment. This switch is a manual reset. If the fur­nace fails to operate, contact a qualified service techni­cian.

• 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 supply. Then call a qualified service
technician.

SYSTEM OPERATION

THERMOSTATS

Set your thermostat for either heating or cooling then set it for
the desired temperature. DO NOT MOVE THE THERMO­STAT RAPIDLY ON AND OFF, OR BACK AND FORTH
FROM HEAT TO COOL. THIS COULD DAMAGE YOUR
EQUIPMENT.

Always allow at least 5 minutes between changes. Find the
temperature that is most comfortable to you, and then LEAVE
YOUR THERMOSTAT ALONE. (Exception is for night or
vacation “set back” to conserve energy).

Manually moving the thermostat up or down will not speed up
temperature changes in your rooms. This only causes the
thermostat switch to function at your command rather than
responding to room temperature.

Heat generated by devices other than the furnace may inter­fere with thermostat performance. Therefore, lamps, radios,
television sets, etc. should not be placed near the thermostat.

• Do not use this furnace if any part has been under water.
A flood-damaged furnace is extremely dangerous.
Attempts to use the furnace can result in fire or explo­sion. A qualified service technician should be contacted
to inspect the furnace and to replace all gas controls,
control system parts, electrical parts that have been wet
or the furnace if deemed necessary.

• Determine the integrity of the installation regarding the
flue gas vent, the return and supply air duct. Confirm the
equipment is well supported and there are no signs of
deterioration. The manufacturer recommends that main
burner, ignition device and controls are inspected by a
qualified service technician before each heating season.

FIGURE 1 - TYPICAL THERMOSTAT

INTERMITTENT IGNITION DEVICE

Your unit is equipped with a cycling pilot burner. It has a Pilot
Relight control designed to automatically light the pilot burner
each time the thermostat “calls” for heat.

This furnace is equipped with an intermittent pilot and auto­matic re-ignition system. Do Not attempt to manually relight
the pilot. Personal injury could result.

2 Johnson Controls Unitary Products

66441-YUM-D-1011

When the thermostat calls for heat, pilot gas is supplied and
at the same time, sparking occurs to light the pilot gas. With
the pilot lit, the flame sensor rod closes a circuit to the ignitor
control which then opens the gas valve to admit main burner
gas.

When the room thermostat is satisfied, the electrical circuit to
the gas valve is opened, closing off both main burner and
pilot gas simultaneously. If the pilot burner should fail to light,
contact your heating contractor or gas utility for service to
insure that proper operating conditions are restored.

INPUT

The correct heat capacity of the furnace is regulated by the
burner orifices and the gas pressure. The proper orifices are
furnished but the gas pressure regulator must be adjusted by
the installer or gas utility service technician.

OPERATING INSTRUCTIONS

TO SHUT DOWN THE FURNACE:

1. Close the main gas shutoff valve(s).

2. Turn off the electric power supply.
TO LIGHT THE FURNACE:

1. Do not attempt to light manually.

2. Open the main gas shutoff valve(s).

5. The draft fan will operate. After an adequate purge time,
the electric spark igniter will light the burners.

6. The burners will extinguish and relight automatically upon
the demand of the room thermostat.

VENT SAFETY SYSTEM:
This gas furnace is equipped with an automatic reset high

temperature sensor or rollout switch which in the unlikely
event of a sustained main burner flame rollout will shut off the
flow of gas by closing the main gas valve. The ignition mod­ules will also be disabled, preventing the flow of gas to the
valves. The switch is located inside the gas heat access
panel above the burner inlet. Flame rollout can be caused by
blockage of the power vent system, improper gas pressure or
adjustment. If this event occurs the furnace will not operate
properly, gas supply to the furnace should be shut off and no
attempt should be made to place the furnace in operation.
The system should be inspected by a qualified service techni­cian. Refer to Figure 2 for a typical installation.

100% SHUT OFF:
The ignition modules are designed for 100% shut-off. If the

furnace fails to ignite within 85 seconds after a call for heat,
the flow of gas (including pilot) will be shut off and the ignition
module will lock out. The module can be reset by:

A. Turning the system switch on the room thermostat to the

“OFF” position and back to the “HEAT” position.

3. Adjust the set point of the room thermostat above the tem­perature in the space.

4. Turn on the electric power supply.

B. Decreasing the set point of the room thermostat below

the temperature in the conditioned space and returning it
to its original setting.

C. Opening and closing the unit's main disconnect switch.

FIGURE 2 - TYPICAL INSTALLATION

Johnson Controls Unitary Products 3