CONTENTS
SAFETY INFORMATION . . . . . . . . . . . . . . . . .2
FOR YOUR SAFETY . . . . . . . . . . . . . . . . . . . . . . . 2
USER’S, MAINTENANCE and
SYSTEM OPERATION. . . . . . . . . . . . . . . . . . .2
THERMOSTATS . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INTERMITTENT IGNITION DEVICE . . . . . . . . . . . 2
INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . 3
SERVICE INFORMATION
MANUAL
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
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.
REPLACEMENT PARTS . . . . . . . . . . . . . . . . .5
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could
result in serious injury, death, or property dam-
age.
- Do not store or use gasoline or other flamma-
ble 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 neigh-
bor’s phone. Follow the gas supplier’s instruc-
tions.
•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
INPUT
The correct heat capacity of the furnace is regulated by the
main burner orifices and the gas pressure. The proper ori-
fices for natural gas are furnished but the gas pressure regu-
lator must be adjusted by the installer or gas company
service person.
HEAT EXCHANGER TUBE
GAS
SUPPLY
PIPE
BURNER
BURNER BRACKET
IGNITOR
BURNER FLAME
(BLUE ONLY)
OPERATING INSTRUCTIONS
TO SHUT DOWN THE FURNACE:
1. Close the main gas shutoff valve(s).
2. Turn off the electric power supply.
FIGURE 2 - TYPICAL FLAME APPEARANCE
EXHAUST VENT OUTLET
TO LIGHT THE FURNACE:
1. Do not attempt to light manually.
2. Open the main gas shutoff valve(s).
3. Turn on the electric power supply.
4. Initiate a call for heat.
SHIPPING LABELS
(REMOVE SHIPPING
LABELS PRIOR TO
VENT INSTALLATION)
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 automati-
cally upon the demand of the controller.
VENT FLUE ASSY.
HEAT SECTION DOOR
VENT SAFETY SYSTEM
COMBUSTION AIR INLET
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.
FIGURE 3 - FLUE VENT ASSEMBLY
This furnace is equipped with a blocked vented shut-off sys-
tem (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.
FILTER CHANNEL
PERIMETER FRAME
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.
FILTERS
EXTERNAL
UPRIGHT
EXTERNAL
UPRIGHT
FILTER
BRACKET
FILTERS
FILTER CHANNEL
BASE RAIL
FIGURE 4 - FILTER ACCESS
Johnson Controls Unitary Products
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363857-YUM-A-0208
All other fans and motors should be lubricated per schedule
in MAINTENANCE SECTION in the UNIT INSTALLATION
INSTRUCTION.
MAINTENANCE
GENERAL
Snow or debris should not be allowed to accumulate in or
around the unit. Do not permit overhanging structures or
shrubs to obstruct condenser air discharge, combustion air
inlets or vent air outlets on your unit. Adequate air is impor-
tant to the safe and proper operation of the unit.
AIR FILTERS
NOTE: For hi-efficiency rigid or bag filters, consult manufac-
turers manual.
Filters must always be used. They should be inspected once
a month and thoroughly cleaned or replaced if it appears they
are beginning to accumulate excessive dirt. Filter sizes and
quantities are shown in the following table.
To install the filters, open the filter access door.
Prior to any of the following maintenance proce-
dures, shut off all power to the unit.
Slide the dirty filters out and slide the clean filters all the way
into the filter racks provided (see Fig. 4). They must butt each
other when sliding into position. Close the filter access door.
HEATING SYSTEM INSPECTION
NOTE: Filters must be installed with “Air Flow” arrows point-
ing toward the evaporator coil. They must also be
re-installed in their original position without any gaps
between filters.
It is the owner's responsibility to insure that an annual inspec-
tion of the entire heating portion of the unit is made by a qual-
ified service agency. This should include inspection of the
burners, tubes and flue for any corrosion or soot accumula-
tion which may require cleaning and also checking of burners
and controls for proper operation.
CONDENSER COIL
In addition, at least once during the heating season, the
owner shall make a visual inspection of the flue or vent air
outlets for evidence of black soot or blockage by leaves or
other debris. If any soot is found it is recommended a quali-
fied service agency be called immediately. Also clear any
blockage found around either the vent air hoods or combus-
tion air inlets.
An annual check and cleaning, if necessary, of the condenser
coil should be done. Clean any debris and dirt from the out-
side coil face with a brush being careful not to damage the
fins. If extremely dirty, a hose can be used to wash the coil
from the inside out while brushing a soapy solution on the
outside.
BLOWER ASSEMBLY
Check for obvious signs of deterioration of the furnace.
Check that the return and supply ducts attached to the unit
are sound and air tight without sagging cracks or gaps.
Check that the unit's physical support, or roof curb, is sound
and not in need of repair. Make sure there are no gaps
between the roof curb and the unit where rain could leak.
Even with good filters properly in place, blower wheels and
motors will become dust laden after long months of operation.
The entire blower assembly should be inspected annually. If
the motor and/or the blower wheel are heavily coated with
dust, they can be brushed and cleaned with a vacuum
cleaner.
Start the furnace. The ventor motors should start and after a
short delay the main burners should ignite. If they do not,
contact a qualified service person for assistance. Check the
appearance of each main burner flame. The flame should
have a blue appearance. No yellow flame should be
observed. A yellow flame indicates a problem with the com-
bustion system or that cleaning is required.
BEFORE CALLING A SERVICE PERSON:
A. Check controller setting and insure it is calling for heat-
ing or cooling.
B. Check fuses or circuit breakers.
C. Check filters for excessive dust accumulation.
LUBRICATION
Outdoor fan and ventor motors are permanently lubricated.
Lubrication is not recommended.
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Johnson Controls Unitary Products
363857-YUM-A-0208
TABLE 1: FILTERS
QUANTITY PER UNIT AND SIZE
30 TON
FILTER
25 TON
40 TON
2 Hi Eff. TA
4 ea. 16 x 25 / 6 ea. 20 x 25
4 ea. 16 x 25 / 6 ea. 20 x 25
4 ea. 16 x 25 / 6 ea. 20 x 25
4 ea. 16 x 25 / 6 ea. 20 x 25
4 ea. 16 x 25 / 6 ea. 20 x 25
4 ea. 16 x 25 / 6 ea. 20 x 25
4 ea. 16 x 25 / 6 ea. 20 x 25
4 ea. 16 x 25 / 6 ea. 20 x 25
4 ea. 16 x 25 / 6 ea. 20 x 25
4 ea. 16 x 25 / 6 ea. 20 x 25
4 ea. 16 x 25 / 6 ea. 20 x 25
4 ea. 16 x 25 / 6 ea. 20 x 25
2 Pleated, 65%
65% Rigid w/2 TA Prefilters
95% Rigid w/2 TA Prefilters
REPLACEMENT PARTS
Contact your local York® parts distribution center for
authorized replacement parts.
Johnson Controls Unitary Products
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363857-YUM-A-0208
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Johnson Controls Unitary Products
363857-YUM-A-0208
Johnson Controls Unitary Products
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Subject to change without notice. Printed in U.S.A.
363857-YUM-A-0208
Supersedes: Nothing
Copyright © 2008 by Johnson Controls, Inc. All rights reserved.
Johnson Controls Unitary Products
5005 York Drive
Norman, OK 73069
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