Precedent Manual del Usuario
Contents
1. before servicing unit A WARNING 7 prevent an explosion and possible injury death and equipment damage do not store combustible materials gasoline or other flammable vapors and liquids near the unit These steps should only be performed by a qualified service technician 1 Inspect the control panl wiring and heating controls to make sure connections are tight and wiring insulation is intact 2 Turn the unit on and off at the thermostat to be sure the ignition control and spark electrode are operating prop erly 3 Turn off the gas supply with the unit operating to verfiy that the gas valves closes and that a re ignition cycle is initiated by the ignition control 4 Check the operation of the gas ignition system 5 Check the burner manifold manifold pressure a 1 8 inch pipe plug is provided in the gas valve for this purpose 6 Visually inspect all of the unit s flue product passage ways for excessive deposit build up and corrosion If build up or corrosion is appparent perform the neces sary repairs 7 Arrange for a qualified serviceman to inspect the unit ev ery other heating season to maintain safe and efficient operation 8 Visually check the main burner flames They should be bright blue flames extending into the heat exchanger sections 8 Never store anything fammable or combustible around or near the unit Technical Literature Printed in USA2. cycling on it s limit control immediately contact a service person for instructions If flames from the burner are not properly drawn into the heat exchanger a Flame Rollout Protection Control will open causing the furnace to shut off The cause must be in vestigated by a qualified service person 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 the unit to operate properly and safely the furnace needs air for both combustion and ventilation Check to make sure that all air openings are unobstructed and there is adequate clearance around the unit to provide good air flow 1 Set the thermostat s heating adjustment lever at its low est setting 2 Move the selector switch to the Off position 3 Turn off all electric power to the unit 4 This unit is equipped with an ignition device which auto matically lights the burners Caution Never attempt to manually light the burner 5 Remove the access panel that contains the following la bel REMOVE THIS PANEL TO GAIN ACCESS TO THE GAS VALVE 6 Turn gas control knob clockwise to the OFF position Note Some valves require the knob to be pushed in slightly before turning High Heat Filter Size Filter Size Millimeters Inches Millimeters 2 508x635x25 2 20x30x1 2 508x762x25 YH SC048 2 20x25x1 2 508x635x25 2 20x25x1 2 508x635x
3. has been under water A WARNING shout overheating occur or the gas supply fail to shut off shut off the gas valve to the furnace before shutting off the electrical supply 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 refer ence 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 fig ure 1 for component layout Remember these instructions at all times 1 Never perform any maintenance procedures until the electrical power to the unit is turned off 2 Never perform any maintenance procedures until the gas valve is the gas supply line is turned off 3 Never remove any panels from the unit while it is operat ing 4 Never remove panels or parts from the unit that are not discussed in this manual 5 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 gives lon
4. 25 2 20x30x1 2 508x762x25 YSCO60A1 3 4 W 2 20x25x1 2 508x635x25 2 20x25x1 YHC060A1 3 4 W 2 20x30x1 2 508x762x25 2 20x30x1 2 20x30x1 2 508x762x25 2 20x30x1 2 508x762x25 2 508x635x25 2 508x762x25 YSC060 D T 2 20x30x1 2 508x762x25 N A N A 2 20x30x1 2 508x762x25 YH SC072 4 16x25x2 4 406x635x50 4 16x25x2 4 406x635x50 4 16x25x2 4 406x635x50 YSCO90 4 16x25x2 4 406x635x50 4 16x25x2 4 406x635x50 4 16x25x2 4 406x635x50 YSC092 4 16x25x2 4 406x635x50 4 16x25x2 4 406x635x50 4 16x25x2 4 406x635x50 YH SC102 4 20x25x2 4 508x635x50 4 20x25x2 4 508x635x50 4 20x25x2 4 508x635x50 4 4 4 4 4 4 508x635x50 4 4 4 4 YH SC120 4 20x25x2 4 508x635x50 4 20x25x2 4 508x635x50 4 20x25x2 4 508x635x50 7 Wait 5 minutes to clear out any gas If you then smell gas STOP Follow For Your Safety What To Do If You Smell Gas instructions on front page If you do not smell gas go to the next step 8 Turn gas control knob counterclockwise to the ON posi tion 9 Replace panel removed in step 4 above 10 Turn on all electric power to unit 11 Set thermostat to desired temperature and move the se lector switch to the ON position The unit will now oper ate automatically 12 If the unit will not operate follow the instructions To Turn O
5. User s Information Y_C UM 1B 22 5335 2 Library Service Literature M a n u a Product Section Unitary Product Rooftop Lt Comm Customer Property Contains Model Y wiring and service informa Literature Type User s Manual tion Please retain Sequence 1B Date March 2003 File No SV UN RT Y_C UM 1B 3 03 Supersedes Y_C UM 1B 9 02 Models ysco36A YSCO48A YSCO60A Com bination Co oli ng YSC072A YSCO90A YSCO92A YSC102A YSC120A ss Wosa Hevea Gas Heat Package Units YHC120A A WARN I N G If the information in this manual is not followed exactly a fire or explosion may result causing property damage personal injury or loss of life 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 Immediately call your gas supplier from a neighbors s phone Follow the gas supplier s in structions If you can not reach your gas supplier call the fire department Installation and service must be performed by a qualified installer service agency or the gas supplier A WARNING bo not use this furnace if any part has been under water Immediately call a qualified service technican to inspect the furnace and to replace any part or the control system and any gas control which
6. ff Gas To Unit under Heating System Shut down and call your service technician or gas supplier Important Note The unit is to be adjusted to obtain an air rise within that 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 po sition 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 la bel REMOVE THIS PANEL TO GAIN ACCESS TO THE GAS VALVE 4 Turn gas control knob clockwise to the OFF position 5 Replace panel removed in step 3 above A CAUTIONS tnis is done during the cold weather months provisions must be taken to prevent freeze up of all water pipes and water receptacles Whenever your house or building is to be vacant arrange to have someone inspect your structure for proper temperature This is very important in below freezing weather If for any reason your furnace should fail to operate damage such as frozen water pipes could result American Standard Inc 2003 Heating System Maintenance Complete the following unit inspections and service routines at the beginning of each heating season A WARN l N G To prevent injury or death due to electrical shock or contact with moving parts lock unit disconnect switch in open position
7. g lasting services some of the mainte nance work must be performed by a qualified service per son When a service person is referred to in this manual it is de scribing 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 ser vice company that can provide a service person of this cali ber Thermostat Room thermostats are delicate temperature sensing con trols Their main function is to 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 Off positions When the switch is positioned at Off your unit will not oper ate in either the 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 setting The unit will also operate automatically when the selector switch is positioned at Cool The fan selector switch can be used to operate the indoor fan continuously by positioning it at On When set to Auto the fan will only operate when required during the heating or cooling cycles To ensu
8. ion Your unit s heating system has a solid state electronic igni tion 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 drops below the thermostat setting The thermostat then en ergizes the heating electrical circuit that starts and controls the furnace burners Shortly after the burners ignite the in door fan starts and circulates warm air through the condi tioned space When the air temperature rises to the thermostat setting the thermostat de energizes the heating electrical circuit which in turn extinguishes the burners The indoor fan continues to circulate warm air until most of the heat is removed from the unit s combustion chamber Table 1 Recommended Standard Filters Low Heat Filter Size Inches Millimeters Unit Model Number Medium Heat Inches YH SC036 2 20x25x1 2 508x635x25 2 20x25x1 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 filters or defective fan motor may cause the unit to cycle on and off as the limit trips and automatically resets If you sus pect that the unit is
9. re that the thermostat operates properly it must be level and positioned to avoid the influence of such external heat sources and lamps televisions or other heat producing appliances RETURN as SUPPLY a 0 a 10 O FILTERS PRESSURE SWITCH GAS VALVE COMPRESSOR Air Filters Filters are to be used with this unit Units ship from the fac tory with filters installed 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 every week for the first 4 weeks See Table 1 for the required filter size s If you have disposable type filters replace them with new filters 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 Ensure that the filters are thoroughly dry before reinstalling them in the unit or duct system Note It may be necessary to replace permanent filters 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 Heating System Heating Cycle Operat
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