York 363857-YUM-A-0208 User Manual

CONTENTS

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

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

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

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

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

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

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

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . .4

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

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

LUBRICATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

AIR FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

CONDENSER COIL. . . . . . . . . . . . . . . . . . . . . . . . 4

BLOWER ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . 4

BEFORE CALLING A SERVICE PERSON:. . . . . . 4

REPLACEMENT PARTS . . . . . . . . . . . . . . . . .5

USER’S, MAINTENANCE and

SERVICE INFORMATION

MANUAL

SINGLE PACKAGE

AIR CONDITIONER

GAS/ELECTRIC

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

363857-YUM-A-0208

363857-YUM-A-0208

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.

• 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.

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.

FIGURE 1 - TYPICAL THERMOSTAT
INTERMITTENT IGNITION DEVICE

Your unit is equipped with a cycling spark ignition device. It
has a Relight control designed to automatically light the burn­ers each time the thermostat controller “calls” for heat.

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

When the controller calls for heat, gas is supplied to the Inte­gral Crossover Burners and at the same time, sparking
occurs to light the main burner gas. A flame sensor closes a
circuit to the ignitor control which proves that all of the burn­ers have ignited properly.

On initial start-up, air may be in the gas lines. Several tries for
ignition may be required before the gas will carry over and
the heat sections remains lit. The ignition model has 3 trials
for ignition. If the ignition module locks out, it may be neces­sary to remove re-establish the call for heat W1 or W2 to con­tinue the purging process.

When the controller is satisfied, the electrical circuit to the
gas valve is opened, closing off the flow of gas to the main
burner.

If the burners should fail to light, contact your heating con­tractor or gas company for service to insure that proper oper­ating conditions are restored.

In the event that gas to the main burner has been sh ut-off,
DO NOT attempt to place the furnace into operation. Call the
appropriate service agency.

2 Johnson Controls Unitary Products

363857-YUM-A-0208

INPUT

The correct heat capacity of the furnace is regulated by the
main burner orifices and the gas pressure. The proper ori­fices for natural gas are furnished but the gas pressure regu­lator must be adjusted by the installer or gas company
service person.

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).

3. Turn on the electric p ower suppl y.

4. Initiate a call for heat.

5. If the return air temperature is below the set point of the
controller, the ventor fans will operate. After an adequate
purge time, the intermittent ignition device will light the
burners. The burners will extinguish and relight automati­cally upon the demand of the controller.

VENT SAFETY SYSTEM
Each gas furnace module is equipped with an automatic

reset high temperature limit and rollout switch. In the unlikely
event of a sustained main burner flame rollout, the switch will
shut off the flow of gas by closing the main gas valve. The
ignition module will also be disabled, preventing the flow of
gas to the valve. The rollout switch for each module is located
inside the gas heat section access door on the heat shield of
each module. Flame rollout can be caused by blockage of the
power vent system or improper gas pressure adjustment. If
this 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 person. Refer to Figure 3
for a typical installation of vent hoods.

The ignition modules are designed such that if the furnace
fails to ignite after 3 trials for ignition after a call for heat the
flow of gas will be shut off and the ignition module will lock out
for one hour. Then the modules will retry ignition and repeat
cycle until ignition occurs, or call for heat is satisfied or power
to unit is removed. If the furnace does not light after several
tries, a service man should be called to determine the cause
of the problem.

HEAT EXCHANGER TUBE

GAS

SUPPLY

PIPE

BURNER

BURNER BRACKET

BURNER FLAME

(BLUE ONLY)

IGNITOR

FIGURE 2 - TYPICAL FLAME APPEARANCE

EXHAUST VENT OUTLET

SHIPPING LABELS
(REMOVE SHIPPING
LABELS PRIOR TO
VENT INSTALLATION)

VENT FLUE ASSY.

COMBUSTION AIR INLET

HEAT SECTION DOOR

FIGURE 3 - FLUE VENT ASSEMBLY

This furnace is equipped with a blocked vented shut-off sys­tem (air proving switch). The purpose of the switch is to prove
that there is combustion air being drawn through the heat
section. The ignition control will not operate if this switch is
not made in the pre-purge time of the vent assembly. In the
event that the furnace fails to operate due to the pressure
switch, a qualified service agency should be contacted.

Determine that external vent is in place (field installed) and
clear and free of obstructions.

EXTERNAL

UPRIGHT

BRACKET

FILTER CHANNEL

FILTER

FILTERS

FILTERS

PERIMETER FRAME

EXTERNAL
UPRIGHT

FILTER CHANNEL

BASE RAIL

FIGURE 4 - FILTER ACCESS

Johnson Controls Unitary Products 3