York PCG4 User Manual
USER’S INFORMATION
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MANUAL
SINGLE PACKAGE
AIR CONDITIONER/GAS HEAT
MODELS: PCG4
TABLE OF CONTENTS
CONTACT INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
SYSTEM OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
THERMOSTATS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
SPARK IGNITION DEVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
HEATING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
COOLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
CIRCULATING FAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
FOR YOUR SAFETY, READ BEFORE OPERATING . . . . . . . . . . . .3
WHAT TO DO IF YOU SMELL GAS . . . . . . . . . . . . . . . . . . . . . . . . . .3
START-UP INSTRUCTIONS - HEATING SYSTEM . . . . . . . . . . . . . . 3
SHUT-DOWN INSTRUCTION - TO TURN
OFF GAS TO APPLIANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
NORMAL MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
GENERAL MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
FILTER CARE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
OUTDOOR COIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
BURNERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
TO CLEAN BURNERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
FLUE DISCHARGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
CLEANING FLUE PASSAGES AND HEATING ELEMENTS . . . . .4
REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
BEFORE CALLING A SERVICEPERSON: . . . . . . . . . . . . . . . . . .4
REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
SOME EFFICIENCY DO'S AND DON'TS . . . . . . . . . . . . . . . . . . . .4
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
CONTACT INFORMATION
• Go to website at www.york.com, then click on “Contact Us” and
follow the instructions.
• Contact us by mail:
We recommend that the user read all sections of this
manual and keep the manual for future reference.
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
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 (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.
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 m inor or moderate injury.
alert against unsafe practices and hazards involving only property damage.
.
.
It is also used to
Johnson Controls Unitary Products
Consumer Relations
5005 York Drive
Norman, OK 73069
1. Make sure that the furnace area is clear and free of combustible
materials, gasoline and other flammable vapors and liquids.
2. For proper operation of this furnace, air for combustion and ventilation is required. Make sure that these openings are not obstructed.
3. For lighting or shutting down this furnace, refer to the lighting
instructions provided adjacent to the burners and also located in
this manual.
4. A 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 agency.
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 supply. Then call a qualified service technician.
6. Do not use this furnace if any part has been under water. A flooddamaged furnace is extremely dangerous. Attempts to use the furnace can result in fire or explosion. A qualified service agency
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.
7. Prior to each heating season inspect the flue gas vent and the
return and supply air duct and ensure that 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 furnace technician before each heating
season.
This heating/cooling unit is designed for outdoor use and can be
installed anywhere from grade level to the roof. Electric air conditioning
in the summer and gas heating in the winter - all from a single unit.
8. Do not allow snow to accumulate near the furnace where it could
block the flue gas vent or the combustion air intake.
Johnson Controls Unitary Products 1183747-UUM-B-0415
1183747-UUM-B-0415
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New Graphic to be added later
AIR INTAKE HOOD
AIR INTAKE SCREEN
EXHAUST HOOD
A0284-001
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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.
SPARK IGNITION DEVICE
This unit is equipped with a spark ignition device. The control is
designed to automatically light the burner each time the thermostat calls
for heat.
WARNING
Flue hood surface and immediate area is designed to operate at high
temperatures during the heating cycle. Special attention must be
given to keep all human contact and debris away from this area.
FIGURE 1: Exhaust and Air Intake Hoods
CAUTION
Do not attempt to manually light the burners. Personal injury could
result.
HEATING
When the thermostat calls for HEAT, the thermostat terminal “W” is
energized, the control board checks for a open pressure switch and
closed limit switches, then energizes the combustion air blower.
After combustion airflow is established, the air proving pressure switch
closes, the ignitor begins to spark, the main valve opens and the burners light.
The flame rod senses a flame and keeps the gas valve open.
30 seconds after the main burners light the circulating fan is energized
at the heating speed.
When the thermostat is satisfied, terminal W is de-energized, de-ener-
gizing the ignition system and closing the gas valve.
After a 15 second post purge timing period, the combustion air blower is
de-energized and the heat fan off timing begins.
When the field-selected heat fan off timing is completed the circulating
fan is de-energized.
If the limit switch or the rollout switch opens, the ignition system is de-
energized and the gas valve closes. The combustion blower and the circulating fan are energized.
The combustion blower remains energized for the 15 second post
purge timing period if the limit switch or the rollout switch contacts reset
(the rollout switch must be manually reset). The circulating fan remains
energized for the selected heat delay off timing.
Normal operation of the system resumes.
WARNING
Incorrect installation of the flue vent hood could cause personal injury
or property damage.
COOLING
When the thermostat calls for “COOL”, the thermostat signals the compressor and outdoor fan to run.
The circulating fan is immediately energized at cooling speed.
When the thermostat is satisfied, the compressor and outdoor fan are
de-energized.
After a cool fan off delay timing of 30 seconds the circulating fan is de-
energized.
CIRCULATING FAN
When the thermostat calls for “FAN”, the thermostat terminal signals the
circulating fan to run at the selected fan speed.
If a call for “COOL” occurs, the circulating fan switches to the cool
speed.
If a call for “HEAT” occurs, the circulating fan switches to heat speed
after a 30 second delay.
When the thermostat ends the call for “FAN”, the circulating fan is deenergized.
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 installing service person or gas company. This is a one-time adjustment.
WARNING
Should overheating occur, shut off the manual gas valve external to
the appliance before shutting off the electrical supply.
2 Johnson Controls Unitary Products
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