American Standard YC 24F/G1 Series Guide

FOUAL
For service and owner's use
TI
YC-UM-2B
32-5033-03
Library Service Literature
Product Section Unitary
Product Packaged Gas/Electric
Model YC*
Literature Type User's Manual
Sequence 2B
Date November 2001
File No. SV-UN-RT-YC-UM-2B 11/01
Model:
YC*024 F/G 1
YC*030 F/G 1
YC*036F/G 1,3,4
YC*042 F/G 1,3
YC*048F/G 1,3,4
YC*060F/G 1,3,4
Combination Cooling/
Gas Heating Package
Unit
IMPORTANT--This Document is customer propertyand isto remain with thisunit. Please return toservice information pack upon completion of
work.
WARNING: Iftheinformation in this manual
is not followed exactly, a fire or explosion
may result causing property damage, per-
sonal injury or loss of life.
Do not store or use gasoline or other
flammable vapors and liquids in the vi-
cinity of this or any other appliance
m 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 build-
ing.
,, Immediately call your gas supplier
from a neighbor's phone. Follow the
gas supplier's instructions.
,, If you cannot reach your gas sup-
plier, call the fire department.
Installation and service must be per-
formed by a qualified installer, service
agency or the gas supplier.
WARNING: SHOULDOVERHEATING
OCCUR, OR THE GAS SUPPLY FAIL TO SHUT OFF,
SHUT OFF THE GAS VALVE TO THE UNIT BEFORE
SHUTTING OFF THE ELECTRICAL SUPPLY.
The following warning complies with State of California law, Proposition 65.
WARNING: Hazardous Gasses!
Exposure to fuel substances or by-products of incomplete
fuel combustion is believed by the state of California to
cause cancer, birth defects, or other reproductive harm.
WARNING: Do NOT USE THIS UNIT IF
ANY PART HAS BEEN UNDER WATER. IMMEDIATELY
CALL A QUALIFIED SERVICE TECHNICIAN TO
INSPECT THE FURNACE AND TO REPLACE ANY
PART OF THE CONTROL SYSTEM AND ANY GAS
CONTROL WHICH HAS BEEN UNDER WATER.
The following warning complies with State of California law, Proposition 65.
,WARNING: This product contains
fiberglass wool insulation! Fiberglass dust and ceramic
fibers are believed by the State of California to cause
cancer through inhalation. Glasswool fibers may also
cause respiratory, skin, or eye irritation.
© 2001 American Standard Inc. All rights reserved

GENERAL iNFORMATiON
OVERVIEW
Your combination gas heating /electric cooling unit is de-
signed to comfort condition all year long with safe, efficient,
trouble-free operation. It is important that you understand
how to operate and maintain your unit to keep it operating
safely and efficiently. This manual will acquaint you with these
important procedures. Familiarize yourself with this manual
and store it in a convenient location for future reference.
Any additions, changes, or conversions required in order for
the unit to satisfactorily meet the application needs, should be
made by a qualified product distributor or local service dealer,
using factory specified and approved parts. See figure 1 for
component layout.
Remember these instructions at all times:
• Never perform any maintenance procedures until the
electrical power to the unit is turned off.
• Never perform any maintenance procedures until the gas
valve in gas supply line is turned off.
• Never remove any panel from the unit while it isoperating.
• Never remove panels or parts from the unit that are not
discussed in this manual.
• Never cover the unit since it is designed to operate year
round.
Your unit is of complex design. To ensure that it performs
safely and give long-lasting service, some ofthe maintenance
work must be performed by a qualified serviceman.
When a serviceman is referred to in this manual, it is describ-
ing a service technician that has had special training or a
number of years experience in servicing this type of
equipment. It is your responsibility to select a qualified
service company that can provide a serviceman of this caliber.
THERMOSTAT
Room thermostats are delicate temperature-sensing controls.
Their main function isto energize and de-energize the heating
or cooling circuit to maintain the temperature setting you
select.
Many thermostats contain a room thermometer to indicate the
approximate room temperature, and a temperature scale at
the adjustment indicator to select the desired indoor air
temperature. In addition, most thermostats have a selector
mode switch with Heat, Off and Cool positions, and a fan
switch with On and Auto positions.
When the selector switch is positioned at Off your unit will not
operate in either heat or cool modes. If the selector switch is
set at heat, the unit will automatically cycle on and off to
maintain the desired temperature settings. The unit will also
operate automatically when the selector switch is positioned
at Cool.
HEAT EXCHANGER
COIL
DRAIr
OUTDOOR
COIL
BLOWER UNIT CONTROL BOX FLUE BOX FURNACE GAS VALVE
COM BUSTION
FAN BLOWER
PRESSURE
SWITCH

GENERAL
The fan selector switch can be used to operate the indoor fan
continuously by positioning itat On. When set at Auto, the fan
will only operate when required during the heating or cooling
cycles.
To ensure that the thermostat operates properly, it must be
level and positioned to avoid the influence of such external
heat sources as lamps, televisions or other heat-producing
appliances.
AiR FILTERS
Filters are to be used with the YC*024-060F heating/cooling
units. The basic unit does not have filters in it. However, afilter
accessory is offered that will allow filters to be installed in the
unit. Otherwise a filter rack must be installed by the installer in
the duct work. Affix filter label supplied with the unit adjacent to
the filter area.
INFORMATION
TABLE 1 -=FILTER DATA
NOMINAL FILTER* FILTER
UNIT CFM Sq.Ft.=SlZE RESISTANCE
YC~024F/G 800 2.67 0.05
YC~030F/G 1000 3.33 0.05
YC~036F/G 1200 4 0.05
YC~042F/G 1400 4.67 0.05
YC~048F/G 1600 5.33 0.05
YC~060F/G 2000 6.67 0.05
Fliers must be installed in the return air system.
* Based on 300 FPM face velocity.
** If permanent filters are used, be sure to size following the manufacturer's
recommendations with a clean filter resistance of 0.05 inches of water
column.
HEATING
HEATING CYCLE OPERATION
Your unit's heating system has a solid-state electronic ignition
control that lights the furnace burners each time the thermostat
calls for heat. At the end of each heating cycle, the furnace
burners are extinguished. This type of system is called Direct
Spark Ignition (DSI).
A normal heating cycle begins when the air temperature in your
home drops below the thermostat setting. The thermostat than
energizes the heating electrical circuit that starts and controls
the furnace burners. Shortly after the burner ignite, the indoor
fan starts and circulates warm air through your home.
When the air temperature rises to the thermostat setting, the
thermostat de-energizes the heating electrical circuit, which in
turn, extinguishes the furnace burners. The indoor fan contin-
ues to circulate warm air until most of the heat is removed from
the unit's combustion chamber.
SAFETY CONTROLS
Your unit is equipped with an automatic reset safety limit
control to prevent overheating. When this control opens, it
shuts down the heating electrical circuit until the unit cools
down sufficiently. Inadequate airflow (i.e. caused by dirty air
filters or defective fan motor), may cause the unit to cycle on
and off as the limit control trips and automatically resets. If you
suspect that the unit is cycling on its limit control, immediately
contact a serviceman for instructions.
If flames from the burner are not properly drawn into the heat
exchanger, a Flame Rollout Protection Control will open caus-
ing the furnace to shut off. The cause must be investigated by
a qualified serviceman.
HEATING SYSTEM START-UP
Since your unit has an automatic ignition system, it is easy to
start the heating cycle at the beginning of the heating season.
In order for this unit to operate properly and safely, the furnace
needs air for both combustion and ventilation. Accordingly,
observe the area in which the furnace is installed. Check to
make sure that all the air openings are unobstructed.
SYSTEM
Likewise, insure that the spacing around the furnace itself is
not blocked or obstructed.
1. Set the thermostat's heating adjustment lever at its lowest
setting; then move the selector switch to the Off position.
2. Turn off all electric power to the unit.
3. This unit is equipped with an ignition device which auto-
matically lights the burners.
CAUTION: Never attempt to manually light the
burner.
4. Remove the access panel that contains the following label:
REMOVE THiS PANEL TO GAiN j
ACCESS TO THE GAS VALVE
5. Turn gas control "OFF" either by turning the knob
clockwise O to the "OFF" position or by moving the
toggle switch to "OFF". See Figure 2.
NOTE: Some valves require the knob to be pushed in slightly
before turning.
DO NOT FORCE!
.Wait (5) five minutes to clear any gas. If you then smell
gas, STOP! Follow "For Your Safety',' "What To Do If You
Smell Gas" instructions on the front page. If you do not
smell gas, go to next step.
7. Turn gas "ON" eitherbyturnningthe knob counterclock-
wise _*')to "ON position or by moving the toggle switch to
"ON".
8. Replace panel remove in Step 4.
9. Turn on all electrical power to the unit.
10. Set thermostat to desired temperature and move the selec-
tor switch to the "ON" position. The unit will now operate
automatically.

HEATING SYSTEM
11. Ifthe unit will not operate, followthe instructions "TO TURN
OFF GAS TO UNIT" (under HEATING SYSTEM SHUT-
DOWN) and call your service technician or gas supplier.
!REMOVE THIS PANEL TO GAiN I
ACCESS TO THE GAS VALVE
Important Note: The unit isto be adjusted to obtain an air rise
that is specified on the nameplate.
HEATING SYSTEM SHUTDOWN
To shut down the heating system for brief periods of time,
simply adjust the thermostat selector switch to the "OFF"
position.
Ifyou need to turn the gas off tothe unit, follow the steps below:
TO TURN OFF GAS TO UNIT
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the unit. If service is to be
performed.
3. Remove the access panel that contains the following label:
4. Turn gas control "OFF" either byturning the knob clockwise
Ftothe "OFF" position or by moving the toggle switch to
F". See Figure 2.
NOTE: Some valves require the knob to be pushed in slightly
before turning.
DO NOT FORCE!
5. Replace panel removed in Step 3 above.
CAUTION: If this is done during the cold weather months,
provisions must be taken to prevent freeze-up of all water
pipes and water receptacles. Whenever your home or build-
ing is to be vacant, arrange to have someone inspect your
structure for proper temperature. This is very important in
below freezing weather, iffor any reason your furnace should
failto operate, damage such asfrozen water pipes could result.
COOLING
COOLING SYSTEM START-UP AND
OPERATION
Once electrical power issupplied to the unit, cooling operation
is controlled by the thermostat. With the thermostat selector
switch set at COOL, move the cooling adjustment lever to its
lowest setting to energizethe unit cooling system. Nowthat the
unit is operating, cool air will begin to circulate through your
building. Finally, reposition the cooling adjustment lever to the
desired room temperature; your unit will continue to operate in
the cooling mode automatically.
SYSTEM
COOLING SYSTEM SHUTDOWN
If you wish to shut down the cooling system, the best method
isto move the thermostat selector switch to the OFF position.
To shut down the unit completely, turn off the main electrical
power supply to the unit.
Anytime you think the cooling system is not operating properly,
shut down unit operation at the thermostat and contact a
serviceman for instructions.
ROUTINE MAINTENANCE
You can do some ofthe periodic maintenance functions for the
unit yourself; this includes replacing (disposable) or cleaning
(permanent) the air filters, cleaning the cabinet, cleaning the
condenser coil, and conducting a general unit inspection on a
regular basis.
WARNING: BEFOREREMOVINGUNITI
ACCESS PANELS TO SERVICE UNIT, OPEN UNIT I
DISCONNECT SWITCH TO PREVENT INJURY ORI
DEATH DUE TO ELECTRICAL SHOCK OR CONTACT I
WITH MOVING PARTS. I
AIR FILTERS
it is very important to keep the central duct system air filters
clean. Be sure to inspect them at least once each month when
the system is in constant operation. (In new homes, check the
filters at least ever week for the first 4 weeks.)
Ifyou have disposable-type filters replace them with new filter
of the same type and size. DO NOT ATTEMPT TO CLEAN
DISPOSABLE FILTERS.
Permanent-type filters can be cleaned by washing them with a
mild detergent and water. Make sure that the filters are thor-
oughly dry before reinstalling them in the unit. (or duct system).
NOTE: Itmay be necessaryto replace permanent filter annually
if washing fails to clean the filter, or if the filter shows signs of
deterioration. Be sure to use the same type and size as was
originally installed.
UNIT CABINET
Even though the unit cabinet isdesigned to withstand exposure
to outdoor weather, you can extend the life ofthe cabinet panel
by cleaning and waxing then twice each year. Application of a
light coat of automobile wax is recommended.
CONDENSER COIL
Unfiltered air circulates through the units condenser coil and
can cause the coil's surface to become clogged with dust, dirt,
etc. To clean the coil, vertically (i.e., with the fins) stroke the coil
surface with a soft-bristled brush.

Besuretokeepallvegetationawayfromthecondensercoil
area.
GENERAL UNIT INSPECTION
Occasionally check over the unit; look and listen for unusual or
abnormal operating characteristics. Do not remove any access
panels. If you suspect your unit is not operating properly,
contact a serviceman for instructions.
MAINTENANCE PERFORMED BY SERVICEMAN
COOLING SEASON
To keep your unit operating safely and efficiently, The Com-
pany recommends that a qualified serviceman check over the
entire system at least once a year, and any other time that you
feel one isneeded. Your serviceman may examine these areas
of the unit:
1. filters (for possible cleaning)
2. motors (condenser and evaporator motors are perma-
nently lubricated)
3. gaskets (for possible replacement)
4. refrigerant coils (for possible cleaning)
5. safety controls (for mechanical cleaning)
6. electrical components and wiring (for possible replace-
ment and connection tightness)
7. condensate drain (for possible cleaning)
8. inspect the unit duct connections to see that they are
physically sound and sealed to the unit casing.
9. inspect the unit mounting support to see that it is sound.
10. inspect the unit to see that there is no obvious unit
deterioration.
,WARNING: TO PREVENT INJURY OR DEATH
DUE TO ELECTRICAL SHOCK OR CONTACT WITH MOVING
PARTS, LOCK UNIT DISCONNECT SWITCH IN OPEN
POSITION BEFORE SERVICING UNIT.
WARNING: TO PREVENT AN EXPLOSIONI
OR POSSIBLE INJURY, DEATH AND EQUIPMENT DAMAGE,I
DO NOT STORE COMBUSTIBLE MATERIALS, GASOLINEI
OR OTHER FLAMMABLE VAPORS OR LIQUIDS NEAR THE
UNIT.
HEATING SEASON
Complete the unit inspections and service routines described
below at the beginning of each heating season.
These steps should ONLY be performed by qualified service
technicians.
1. Inspect the control panel wiring and heating controls to make
sure connections are tight and wiring insulation is intact.
a. Turn the unit on and off at the thermostat to be sure
.
3.
.
.
.
.
.
the ignition control and spark electrode are operating.
b. Turn off the gas supply with the unit operating to verify
that the gas valve closes, and that a re-ignition cycle is
initiated by the ignition control.
Check the operation of the gas ignition system.
Check the burner manifold pressure. An 1/8-inch pipe plug
is provided in the gas valve for this purpose.
Inspect the control panel wiring to verify that all electrical
connections are tight, and that wire insulation is intact.
Visually inspect all of the unit's flue product passageways for
excessive deposit buildup and corrosion. If buildup or corro-
sion is apparent, perform the necessary repairs.
Arrange for a qualified serviceman to inspect the unit ever
other heating season to maintain safe and efficient opera-
tion.
Visually check the main burner flames. They should be
bright blue flames extending up to the heat exchanger
sections. (See Figure 2.)
Never store anything flammable or combustible around or
near the unit.
@

LiMiTED WARRANTY
COMBINATION GAS ELECTRIC AiR CONDiTiONER
YCC, YCD, YCH, YCP, YHC and YSC
Models Less Than 20 Tons for Residential Use*
(Parts Only)
This limited warranty isextended by American Standard Inc., to the original purchaser and to any succeeding
owner of the real property to which the Combination Gas Electric Air Conditioner is originally affixed, and
applies to products purchased and retained for use within the U.S.A. and Canada.
f any part of your Combination Gas Electric Air Conditioner fails because of a manufacturing defect within five
rears from the date of the original purchase, Warrantor will furnish without charge the required replacement
)art. Any local transportation, related service labor, diagnosis calls, air filters, refrigerant and related items are
qot included.
If the sealed motor-compressor fails because of a manufacturing defect within five years from the date of
original purchase, Warrantor will fumish without charge the required replacement compressor. Any local
transportation, related service labor, diagnosis calls, refrigerant and related items are not included.
In addition, if the steel heat exchanger fails because of a manufacturing defect within the sixth through tenth
year from the date of original purchase, Warrantor will fumish without charge a replacement heat exchanger.
Any local transportation, related service labor and diagnosis calls are not included.
This limited warranty does not cover failure of your combination gas electric air conditioner ifit is damaged
while in your possession, failure attributable or caused by unreasonable use of the combination gas electric
air conditioner andlor failure to properly maintain the combination gas electric air conditioner as set forth in the
Use and Care manual.
This limited warranty applies to product installedon or after 10/1/'2001 where product ismanufactured after
1/1/'2000. This limited warranty is not retroactive to any installations prior to 10/1/'2001 or on product produced
3rior to 2000.
'['HE LiMiTED WARRANTY AND LIABILITY SET FORTH HEREIN ARE IN LIEU OF ALL OTHER
WARRANTIES AND LiABiLiTiES, WHETHER iN CONTRACT OR iN NEGLIGENCE, EXPRESS
OR iMPLiED, IN LAW OR iN FACT, iNCLUDING IMPLIED WARRANTIES OF
MERCHANTABiLiTY AND FITNESS FOR PARTICULAR USE, AND iN NO EVENT SHALL
WARRANTOR BE LIABLE FOR ANY iNCiDENTAL OR CONSEQUENTIAL DAMAGES.
Some states do not allow limitations on how long an implied limited warranty lasts or do not allow the
exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not
apply to you. This limited warranty gives you specific legal rights, and you may also have other rights which
vary from state to state.
Parts will be provided by our factory organization through an authorized service organization in your area
listed in the yellow pages. If you wish further help or information concerning this limited warranty, contact:
American Standard Inc.
Troup Highway
Tyler, TX 75711-9010
Attention: Manager, After Sales Support
GW-618-4001
*This limited warranty isfor residential usage of this equipment and not applicable when this equipment is
used for a commercial application. A commercial use is any application where the end purchaser uses the
3roduct for other than personal, family or household purposes.

LiMiTED WARRANTY
COMBiNATiON GAS ELECTRIC AiR CONDiTiONER
YCZ, YCY AND YCX
Models Less Than 20 Tons for Residential Use*
(Parts Only)
This limitedwarranty isextended byAmerican Standard Inc.,tothe original purchaser andto any succeeding owner of the real
property to which the Combination Gas Electric Air Conditioner is originally affixed, and applies to products
purchased and retained for use within the U.S.A. and Canada.
Ifany part of your Combination Gas Electric Air Conditioner fails because of a manufacturing defect within five
years from the date of the original purchase, Warrantor will furnish without charge the required replacement
part. Any local transportation, related service labor, diagnosis calls, air filters, refrigerant and related items are
not included.
In addition, ifthe sealed motor-compressor(s) fail(s) or the outdoor coilt should become defective, either or
both events occurring because of a manufacturing defect within the sixth through tenth year from the date of
original purchase, Warrantor will furnish without charge the required replacement compressor and/or outdoor
coil. Any local transportation, related service labor, diagnosis calls, refrigerant and related items are not
included.
tNOTE: If your Combination Gas Electric Air Conditioner is installed within one mile of salt water, including but
not limited to seacoasts and inland waterways, your outdoor coil warranty as stated above is limited to five
years from the date of original purchase.
In addition, ifthe steel heat exchanger fails because of a manufacturing defect within the sixth through
twentieth year
from the date of original purchase, Warrantor will furnish without charge a replacement heat exchanger. Any
local transportation, related service labor and diagnosis calls are not included.
This limited warranty does not cover failure of your combination gas electric air conditioner if itis damaged
while in your possession, failure attributable or caused by unreasonable use of the combination gas electric
air conditioner and/or failure to properly maintain the combination gas electric air conditioner as set forth in the
Use and Care manual.
This limited warranty applies to product installed on or after 10/1/2001 where product is manufactured after
1/1/2000. This limited warranty is not retroactive to any installations prior to 10/1/2001 or on product produced
prior to 2000.
THE LIMITED WARRANTY AND LIABILITY SET FORTH HEREIN ARE IN LIEU OF ALL
OTHER WARRANTIES AND LiABiLiTIES, WHETHER IN CONTRACT OR iN NEGLIGENCE,
EXPRESS OR iMPLiED, iN LAW OR iN FACT, INCLUDING IMPLIED WARRANTIES OF
MERCHANTABiLiTY AND FITNESS FOR PARTICULAR USE, AND iN NO EVENT SHALL
WARRANTOR BE LIABLE FOR ANY iNCiDENTAL OR CONSEQUENTIAL DAMAGES.
Some states do not allow limitations on how long an implied limited warranty lasts or do not allow the
exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not
apply to you. This limited warranty gives you specific legal rights, and you may also have other rights which
vary from state to state.
Parts will be provided by our factory organization through an authorized service organization in your area
listed in the yellow pages. Ifyou wish further help or information concerning this limited warranty, contact:
American Standard Inc.
Trou p Highway
Tyler, TX 75711-9010
Attention: Manager, After Sales Support
GW-617-4001
*This limited warranty is for residential usage of this equipment and not applicable when this equipment is
used for a commercial application. A commercial use is any application where the end purchaser uses the
product for other than personal, family or household purposes.

LiMiTED WARRANTY
COMBiNATiON GAS ELECTRIC AiR CONDiTiONER
YCZ, YCY, YCX, YCC, YCD, YCH, YCP, YHC and YSC
Models Less Than 20 Tons for Commercial Use*
(Parts Only)
This warranty isextended by American Standard Inc., to the original purchaser and to any succeeding owner
of the real property to which the Combination Gas Electric Air Conditioner is originally affixed, and applies to
products purchased and retained for use within the U.S.A. and Canada. There is no warranty against
corrosion, erosion or deterioration.
If any part of your Combination Gas Electric Air Conditioner fails because of a manufacturing defect within one
year from the date of the original purchase, Warrantor will furnish without charge the required replacement
part.
In addition, ifthe sealed motor-compressor fails because of a manufacturing defect within the second through
fifth year from the date of original purchase, Warrantor will fumish without charge the required replacement
compressor.
In addition, ifthe steel heat exchanger fails because of a manufacturing defect within the second through fifth
year from the date of original purchase, Warrantor will furnish without charge a replacement heat exchanger.
Warrantor's obligations and liabilities under this warranty are limited to furnishing F.O.B. Warrantor factory or
warehouse at Warrantor designated shipping point, freight allowed to Buyer's city, replacement parts for
Warrantor's products covered under this warranty. Warrantor shall not be obligated to pay for the cost of lost
refrigerant. No liability shall attach to Warrantor until products have been paid for and then liability shall be
limited solely to the purchase price of the equipment under warranty shown to be defective.
THE WARRANTY AND LiABILiTY SET FORTH HEREIN ARE IN LIEU OF ALL OTHER
WARRANTIES AND LiABiLiTiES, WHETHER iN CONTRACT OR iN NEGLIGENCE, EXPRESS
OR iMPLiED, iN LAW OR IN FACT, iNCLUDiNG iMPLiED WARRANTIES OF
MERCHANTABiLiTY AND FITNESS FOR PARTICULAR USE, AND iN NO EVENT SHALL
WARRANTOR BE LIABLE FOR ANY iNCiDENTAL OR CONSEQUENTIAL DAMAGES.
Some states do not allow limitations on how long an implied warranty lasts or do not allow the exclusion or
limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
American Standard Inc.
Troup Highway
Tyler, TX 75711-9010
Attention: Manager, After Sales Support
GW-606-4800
*This warranty is for commercial usage of said equipment and not applicable when the equipment is used for
a residential application. Commercial use is any application where the end purchaser uses the product for
other than ersonal, famil or household ur oses.
American Standard Inc.
6200 Troup Highway
Tyler, TX 75711-9010 0( °s Since American -Standard has a policy of continuous
product and product data improvement, it reserves the right
to change design and specification without notice.