manual aire acondicionado

AIR CONDITIONING

12 SEER

INSTALLATION & SERVICE MANUAL

Thermo Products, LLC.

North Judson, Indiana

Do Not Destroy

This envelope contains your assembly instructions and guarantee.

This device is potentially dangerous if improperly installed.

We recommend installation by qualified heating & air conditioning contractors.

Please read the enclosed instructions carefully, before & during installation.

Please keep these instructions as permanent reference near appliance. MAC-149 ECN 4416-MA

• • IMPORTANT • •

INDEX

SECTION PAGE I. INSTALLATION INSTRUCTIONS A. DESCRIPTION OF AIR CONDITIONING CONDENSER 1 B. LOCATION OF OUTDOOR CONDENSING UNIT 2 C. TUBING INSTALLATION 3 D. TUBING SIZE REFERENCE CHART 4 E. INSTALLATION OF TUBING LINES TO SERVICE VALVES 5 F. DUCT SYSTEM 6 G. ELECTRICAL 7 H. INITIAL START-UP OF OUTDOOR CONDENSING UNIT 10 AND HOW TO MEASURE SUPERHEAT I. RECOMMENDATIONS FOR OPERATING AT LOWER 13 OUTDOOR AMBIENT CONDITIONS. J. AIR CONDITIONING TROUBLE-SHOOTING GUIDE 14 K. HOMEOWNER INFORMATION 18 L. REPLACEMENT PARTS DIAGRAM 19 M. REPLACEMENT PARTS LIST 20

All installations and services must be performed by qualified personnel.

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THERMO PRIDE CENTRAL AIR CONDITIONING (KEEP INSTRUCTIONS WITH UNIT OR READILY AVAILABLE) I. INSTALLATION INSTRUCTIONS A. DESCRIPTION OF AIR CONDITIONING CONDENSER The outdoor condensing unit is designed and built with a totally enclosed (hermetic) reciprocating or scroll compressor which offers the advantages of simplicity, quiet operation and reduced condenser size. The entire air conditioning system has been built and performance tested against rigid standards. The installation must comply with the National Electrical Code ANSI/NFPA 70-(latest edition), any state or local codes, and these instructions.


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B. LOCATION OF OUTDOOR CONDENSING UNIT The primary consideration in selecting the location of the outdoor-condensing unit is how the location affects the length of the refrigerant tubing lines. Bear in mind that the longer the tubing line the greater the pressure drop causing a reduction in the cooling capacity of the unit. Another consideration in the location selection is the sun load placed on the outdoor condensing unit. Locations which place the unit in direct exposure to the sun during the majority of a day should be avoided if possible. Inside corners on the southeast or southwest corners are to be avoided as the heat build-up in such corners would place an increased work load on the unit. Shaded locations on the north side of a home or office are generally best if practical. Mount the unit on a sturdy base at least one inch above the ground. Be sure to use well tapped gravel fill beneath the blocks or bricks to prevent settling if concrete blocks or bricks are used. Use a minimum 4"x4" "treated" timbers plus gravel fill to prevent settling if timbers are used. The unit is manufactured with runner supports that raise the unit about 1" above the slab allowing air circulation beneath the metal surfaces. This prevents metal corrosion caused by a build up of moisture under the condensing unit.

:A premature compressor failure may result and will "VOID THE WARRANTY" if the outdoor condensing unit is located in an enclosure such as a garage or not in accordance with these instructions. NOTE: It is advisable to wax the outer surface of the condenser unit yearly to aid in protection from the weather. A good automotive grade of wax should be used. All models feature an “up-flow” air flow design discharged through the top grill. For this reason, the outdoor condensing unit should not be located under an overhang or any other construction which would direct the discharged air back to the outdoor condensing unit. The unit should be located as illustrated below.


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C. TUBING INSTALLATION The compressor oil is constantly pumped through the liquid line, evaporator coil, and back through the suction line in normal operation of an Air Conditioning system. Please follow the guide lines listed below to insure proper lubrication of the compressor by avoiding oil accumulation at undesirable points in the system. 1. No traps in the suction line are necessary if the outdoor condensing unit is level with the indoor evaporator coil or the indoor evaporator coil is 4 feet or less lower than the outdoor condensing unit. Any horizontal runs of suction line should have minimum 1/2" pitch towards the outdoor condensing unit for every 10 feet of line.

2. A trap is necessary in the suction line at the indoor evaporator coil if the indoor evaporator coil is more than 4' below the outdoor condensing unit and 1 trap per every 10’ of vertical rise thereafter.

:A gradual loop in the tubing can be constructed to take up the excess tubing if you find that too much tubing has been brought onto a job. Such a loop MUST be kept in a horizontal (flat) plane to avoid trapping the oil. Refrigerant lines should be inserted into a suitable conduit or raceway when the lines are to be buried between the building and the outdoor condensing unit. The lines must be provided with sufficient protection and support to prevent damage when installed above the ground.


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D. TUBING SIZE REFERENCE CHART REFERENCE THE FOLLOWING CHARTS 0’-50’ TOTAL LINE LENGTH

MODEL SUCTION LINE LIQUID LINE

1224 & 1230 3/4” 3/8” 1236 & 1242 7/8” 1/2”

50’-75’ TOTAL LINE LENGTH


1224 & 1230 7/8” 3/8” 1236 & 1242 1” 1/2”

75’-100’ TOTAL LINE LENGTH


1224 & 1230 1” 1/2” 1236 & 1242 1-1/8” 5/8”

NOTES: For line lengths over 25’ adjust charge accordingly per foot of variation from chart. .65 oz. per foot for 3/8” and 3/4” line set .674 oz. per foot for 3/8” and 7/8” line set .694 oz. per foot for 1/2” and 7/8” line set .72 oz. per foot for 1/2” and 1” line set .76 oz. per foot for 5/8” and 1-1/8” line set These charges are to be used in conjunction with a superheat measurement for best performance. 1. Tubing dimensions are outside diameter. 2. Tubing Type ACR, (Type K heavy wall or Type L medium thick wall) 3. Refrigerant line lengths over 100’ are not recommended. 4. These line size recommendations are based on the use of refrigeration grade tubing and do not include considerations for additional pressure drops due to elbows, valves, or reduced joint sizes.


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E. INSTALLATION OF TUBING LINES TO SERVICE VALVES 1. Wrap a wet rag around the valve body and copper stub before brazing. Flux the copper tube and the stub. Braze the joint then use a second wet rag to cool joint before removing first rag wrapped around service valve. When making “on the job” tubing, a solder of 95% tin, 5% antimony or any of the silver solders wuch as SilFos, Phos-Copper, Easy-Flo 35 or 45, should be used. No attempt will be made here to instruct proper soldering or brazing technique but it is necessary that the installer be properly instructed in accordance with good existing practices. 2. All joints and fittings must be properly leak tested as per EPA guidelines after “on the job” tubing has been made up. The line set and the evaporator coil must be evacuated to 29.96” Hg (1000 microns) or lower when all joints and fittings are leak free. The service valves on the condenser may then be opened to release the refrigerant to the system. Verify proper system performance. See condensing unit manual for additional performance data. 3. This is not a backseating valve. Open the valve cap with an adjustable wrench. Insert a 3/16” or 5/16” hex wrench into the stem. Back-out counterclockwise until the valve stem just touches the retaining ring. This opens the valve completely. The gauge port is (open) accessible at all times. NOTE: Make sure all connections have been leak checked before opening service valves. 4. Replace the valve cap “finger-tight” then tighten an additional 1/12 turn or 1/2 hex flat. A metal-to-metal seal is now complete.


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F. DUCT SYSTEM The duct system and load sizing calculation should follow the design standards of Air Conditioning Contractors of America (ACCA) - Manuals D&J -or the American Society of Heating, Refrigeration & Air Conditioning Engineers, Inc. (ASHRAE) Fundamentals Volume (latest edition). To quickly aid you in evaluating existing duct systems, review the chart below. The chart shows the CFM capacity for square inch areas based on .10" W.C. static pressure (SP) loss on the supply systems. To insure the necessary air handling capacity of a duct system, each of the system's components (trunk lines, takeoff's, runs and register and grill free areas) must be properly sized and matched together. A 12x8 duct with a 400 CFM capacity, for example, WILL NOT flow 400 CFM if the register(s) can only flow a total of 200 CFM. When sizing the return air duct system, the air handling capacity MUST BE EQUAL TO the supply system at a minimum. It is recommended that you follow design parameters established by ACCA or ASHRAE on the return air duct systems.


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G. ELECTRICAL All wiring must conform to the provisions of local codes or, in the absence of local codes, with the provisions of the National Electrical Code, "Latest Edition" and this instruction manual. An equivalent type wire must be used if any of the original wire supplied with the unit needs to be replaced. Reference Table A for unit electrical characteristics and bring proper service to the unit through a circuit breaker or fused disconnect switch, in accordance with local codes. In the case of a single phase 230 VAC unit, the neutral wire should be brought to the unit in order to provide ground service. A ground wire must be connected to the unit at the screw or pressure connector marked "ground".

The best fuse size is the smallest fuse that will allow the equipment to operate continuous without any nuisance trips. This type of fuse will give the equipment maximum protection. A time delay type fuse; such as fustat or fusetron, will prevent nuisance trips due to the starting current (locked rotor amps, LRA).

FUSE SIZING - TABLE A MODEL VOLTAGE/PHASE R.L.A.3 L.R.A.4 F.L.A.5 MAX. FUSE OR

CIRCUIT BREAKER SIZE

RECOMMENDED FUSE OR CIRCUIT

BREAKER SIZE

RECOMMENDED WIRE SIZE

* 1,2 AC12241G1 208-230/1 9.3 47.0 2.1 20 15 12 AC12301G1 208-230/1 13.6 61.0 2.1 30 25 10 AC12361G1 208-230/1 15.0 73.0 2.1 35 30 10 AC12421G1 208-230/1 18.4 95.0 2.1 45 40 10

NOTE: Recommend wire sizes are for copper conductors only. *Use (as minimum) type "T" or "TW" wire. 60 C. Local and/or national electrical codes dictate which wire size you must use! For example:

1If a 25 or 30 amp fuse is used, a minimum wire size of 10 AWG must accompany it. If you fuse to maximum sizes, your wire size must be adjusted accordingly. 212 AWG wire may be used only with a 20 amp or smaller fuse size. 3R.L.A.=Compressor running load amps. 4L.R.A.=Compressor locked rotor amps. 5F.L.A.=Full load amps of condenser blower motors. In the event a fuse blows, investigate for the cause. Do not put in a larger fuse and do not exceed maximum fuse size listed on name plate. The name plate is located just above the valve connection on the outside surface of the outdoor unit. NOTICE: Before the Air Conditioning unit is started, the following points must be checked by the installer and/or electrician. 1). Check every electrical connection of "PUSH-ON" or "SCREW-ON" terminals to insure it is secured tightly on its proper post. 2). Review wiring diagram for proper routing. 3). All wiring must comply with NEC or local codes for wire sizes. Also, it is suggested that the next larger size wire to be used when long runs in excess of 100 ft. are experienced. Reference the following wiring diagrams when wiring or servicing. A loose terminal will cause poor flow of electrical power to the compressor and result in very high current draw. This can lead to blown fuses, burned wires, burned contact points and a premature compressor failure. Each electrical contact has been factory checked, however, connections may loosen up due to vibration in transit. Please be certain that all electrical connections are tight. NOTICE: It is highly recommended that all new AC installations be powered at least 24 hours before activating the compressor, in order to allow the oil heater in the base of the compressor to preheat the oil and reduce the risk of friction


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damage to the compressor due to poor lubrication. AC10481G1 and AC10483G1 only. Crankcase heaters are optional on other models. See replacement parts list. Following are various control voltage wiring diagrams for use on different types of forced air furnaces. These diagrams should be used as a reference, however, your situation may require alteration to complete proper controlling.


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H. INITIAL START UP OF OUTDOOR CONDENSING UNIT On cooler days (65° F or lower), attempts to operate the Air Conditioner and take gauged pressure readings may be unsuccessful as unusually low pressures will be observed on the suction line. This type of operation may give the impression of an undercharged unit. Such is NOT necessarily the case. The low pressure reading may exist because of the large condenser surface area and the cold ambient air removing so much heat from the refrigerant. Sub-cooling occurs and results in very low pressures. Adding refrigerant in cold weather will result in an overcharged unit which may then trip out on high pressure limit during warm or hot weather. Line pressures should not be taken for test purposes when the outdoor temperature is below 70° F for this reason. A false reading may occur. Do not attempt to operate the Air Conditioner on a day of 45° F or cooler. All Thermo Pride outdoor condensing units are equipped with gauge ports to connect both liquid and suction line pressure gauges. Refrigerant hoses must be the type which incorporate a "finger" to depress the core. Connections may be made to ports at any time; even while unit is in operation. Follow EPA guidelines in connecting service equipment to refrigerant lines. For example: The use of quick connects and short service hoses are recommended to minimize refrigerant losses.

:Refrigerant is under pressure. Guard against refrigerant spraying into the face or on skin. Always wear protective equipment, i.e. safety glasses or goggles and gloves when working with refrigerant. Line pressures on an operating air conditioning unit will vary with outdoor temperatures. As outdoor temperatures rise, pressures will also rise. See pressure temperature chart for system line pressures at different temperatures. The suction pressure is the most significant when reading gauges. If a unit is suspected of low charge, unit should be recharged using the suction pressure as a guide. Unit is fully charged when proper suction pressure is obtained. Any additional refrigerant may cause damage or additional problems. The pressure/temperature chart on the wiring diagram is to serve only as a guide. Pressures shown are realistic averages which will vary somewhat with changes in air temperatures, air volume across the evaporator coil, condenser coil, and changes in humidity - both inside and outside, and variations in line length.

: DO NOT UNDER ANY CIRCUMSTANCES, HEAT THE REFRIGERANT CYLINDER WITH A TORCH OR BY ANY OTHER MEANS OTHER THAN WARM WATER. EXCESSIVE PRESSURES GENERATED IN THIS MANNER MAY WEAKEN THE REFRIGERANT CONTAINER AND RESULT IN A CYLINDER EXPLOSION! If a charge must be added to the system, connect to the suction service port of the service valve and add a vapor charge only while the system is operating.


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SUPERHEAT: Superheat is extra heat added to refrigerant above the vaporization pressure/temperature of the refrigerant. Superheat cannot be measured with a pressure gauge alone. A combination of a pressure reading and also a physical temperature reading of the suction line is required for superheat measurement. Superheat gives an indication of two important system operating parameters. Superheat at the suction line outlet of the evaporator indicates the efficiency of the evaporator coil. Superheat at the suction line inlet to the compressor insures that liquid refrigerant is not being pumped into the compressor. High superheat is also detrimental to system operation. The highly superheated refrigerant may overheat the compressor, resulting in premature failure and/or intermittent thermal cutout of the compressor. High superheat at the evaporator also indicates the evaporator is operating very inefficiently by vaporizing the refrigerant too quickly in the evaporator coil. High superheat at the evaporator results in poor heat transfer from the conditioned space. Startup of a new cooling system and checkout of an existing system should always include superheat measurements. Before measuring superheat, allow the system to operate under a load for approximately 15 minutes. A conditioned space load will provide heat for the evaporator to remove. Operating the cooling system for 15 minutes allows the refrigeration system to stabilize, providing good operating pressures and temperatures. NOTE! Do not attempt a superheat measurement when the ambient temperature is under 600 F, as low loading to the cooling system will result in low superheat measurements. NOTE! When adding or removing charge to fine tune a cooling system, allow 15 to 20 minutes of system operating time after each adjustment of the charge. After the 15 to 20 minutes of operation occurs, a superheat reading may be taken. EVAPORATOR SUPERHEAT: To measure superheat at the evaporator, a suction pressure reading at the outlet of the evaporator would be desired. Since most residential cooling systems (including Thermo Pride evaporators) do not provide a Schraeder port at the evaporator, the suction pressure must be read at the suction inlet to the compressor. Adding 2 or 3 PSI to the suction line pressure entering the compressor will allow for an average pressure drop in the refrigerant line from the evaporator to the compressor. If a long suction line or a large number of bends and/or elbows exist in the suction line, additional pressure drop may be present. A good resistive type thermometer or Thermo couple reader should be used to measure the suction line temperature exiting the evaporator. On Thermal Expansion valve evaporators, read the temperature directly under the expansion bulb located on the side of the suction line (at the 2:00 or 10:00 position) exiting the evaporator. On capillary tube or orifice type evaporators, measure the temperature at the outlet of the evaporator on the 10:00 or 2:00 position of the suction line. Wrap the thermometer or thermocouple with a rag or insulation to insure system air flow does not affect thermostat or thermocouple temperature. EXAMPLE: 66 PSIG Suction Pressure measured at Condenser 2 PSIG Added for Pressure drop of Suction Line ====== 68 PSIG Modified Pressure of R22 Refrigerant 68 PSIG = 400 F per pressure/temperature chart Physical Temperature 480 F Suction line temperature at outlet of evaporator Subtract - 400 F Temperature from Pressure/Temperature Chart ====== 80 F Evaporator Superheat Thermo Pride recommends an operating evaporator superheat of between 50 F and 120 F


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COMPRESSOR SUPERHEAT: In colder climates or in commercial applications, where the cooling system may be operating under low ambient temperatures or in cases where the line length exceeds 25 feet, it is important to take a superheat measurement of the refrigerant entering the compressor. Taking this superheat at a lower ambient temperature (under 650 F) is acceptable and recommended to simulate the adverse operating conditions of the cooling system. Colder ambient temperatures will definitely lower superheat, possibly to a unsafe level for proper operation of the compressor. Refrigerant lines passing through a cold area such as a crawlspace may produce low superheat, particularly if the insulation is missing from the suction line. Measuring compressor superheat is almost the same procedure as taking evaporator superheat. Measure the suction line pressure of the refrigerant entering the compressor. Do not add any pressure drop to this measurement, as there is no line loss associated with compressor superheat. Allow the system to stabilize while running for 15 minutes before taking measurements. Measure the physical temperature of the suction line very close to the Schraeder port where the suction pressure was measured (at the 2:00 or 10:00 position). Subtract the gauge pressure/temperature from the physical temperature. An absolute minimum of 20 F and maximum of 200 F superheat is required at the inlet to the compressor. A reading of no superheat or negative superheat indicates the refrigerant is at the saturation temperature that may allow liquid refrigerant be pumped into the compressor. Continued operation of returning liquid refrigerant to the compressor may wash the bearings of oil, damage compressor valves, and cause premature compressor failure. Operating with very low or no superheated refrigerant returning to the compressor will cause premature failure of the compressor, voiding the warranty. EXAMPLE: 68 PSIG Suction line pressure of R22 refrigerant taken near compressor. 68 PSIG = 400 F per pressure/temperature chart Physical Temperature 420 F Suction line temperature near Schraeder port close to inlet of compressor

Subtract - 400 F Temperature from pressure/temperature chart ======

20 F Compressor superheat Minimum superheat required at inlet to compressor is 20 F, Maximum is 20° F. SUBCOOLING: Subcooling is extra heat removed from refrigerant below the saturation pressure/ temperature of the refrigerant. Subcooling takes place in the condenser and is dependent upon proper airflow in the condenser, outside ambient air temperature and refrigerant pressure in the condenser. Refrigerant with low subcooling, may cause the evaporator to starve for liquid refrigerant resulting in flash gas, poor evaporator efficiency, high superheat, and generally poor cooling of the conditioned space. Long liquid lines from the condenser to the evaporator, specifically liquid lines exposed to high ambient temperatures may be prone to reduced refrigerant subcooling temperatures. To insure subcooled refrigerant reaches the evaporator, it would be advisable to take the subcooling measurement during the hottest part of the day. This would be typical of the adverse conditions under which the cooling system would operate.


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Before taking subcooling measurements, allow the system to stabilize by operating for at least 15 minutes. To measure subcooling, measure the refrigerant pressure at the liquid line as it leaves the condenser. It would be preferable to measure the liquid line at the evaporator, but most manufacturers including Thermo Pride do not include Schraeder ports at the evaporator. Add a pressure drop of 2 to 3 PSI to the pressure reading at the condenser outlet for a standard 25 ft. line set and 6 feet of vertical rise. This accounts for pressure drop in the liquid line to the evaporator. In the event of an exceptionally long liquid line or excessive elbows and/or bends, an additional pressure drop may exist. For a vertical rise of 6 feet or moe, add 1 psi for every 2 feet of rise to get pressure drop. Once we have the liquid line pressure, the physical temperature must be taken on the liquid line as it enters the evaporator. Use a good resistive thermometer or thermocouple reader. Ensure airflow does not affect the temperature reading by covering the thermometer or thermocouple with a rag or insulation. Subtract the physical temperature from the gauge pressure/temperature. The result is the Subcooling measurement. EXAMPLE: 208 PSIG Liquid line pressure measured at condenser 2 PSIG Added for pressure drop of liquid line ====== 210 PSIG Modified pressure of R22 refrigerant 210 PSIG = 1050 F per pressure/temperature chart 1050 F Temperature from pressure/temperature chart Subtract Physical Temperature - 950 F Liquid line temperature at inlet of evaporator ====== 100 F Subcooled refrigerant entering evaporator Another way to make sure there is liquid feeding the evaporator is to install a liquid line sight glass at evaporator. Thermo Pride recommends subcooling between 50 F and 150 F. I. RECOMMENDATIONS FOR OPERATING AT LOWER OUTDOOR AMBIENT CONDITIONS If you are going to be operating the system below 65°F, Thermo Products specifies you must add to the system the items listed below to aid in its longevity and durability of the compressor. 1. There should be a crankcase heater installed on compressor. 2. A low ambient control (45° contact) added to the 24 volt control circuit. 3. Suction line accumulator. 4. Confirm compressor superheat. These items will assist in preventing liquid floodback, flooded starts, and refrigerant migration during off cycle. These situations are detrimental to the life of a compressor.


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NOTES FOR AIR CONDITIONING TROUBLESHOOTING GUIDE 1.101.0 Check to see if the contactor has not pulled in. Check for 24 volt to the coil on the contactor if the coil has not pulled in the contactor. 1.101.1 Check to make sure the indoor transformer is powering the 24 volt circuit. 1.101.2 Check for 115 volt supply to the indoor transformer. Check service fuse for 115 volt supply. 1.101.3 Check to see if the T-stat is closing to complete the 24 volt circuit. Remove T-stat and jumper terminals R - Y and R - G. If jumpering the sub-base works, replace T-stat. 1.101.4 If all of the above items are ok, check the time delay to see if it is not completing the 24 volt circuit after 3 - minute delay (Time delay is optional). 1.101.5 Replace the contactor if the contactor is reading 24 volts on the coil but is not pulling in the contactor. 1.101.6 Always check the entire 24 volt circuit for loose terminals or cracked wires. 1.101.7 Check for 24 volts through high pressure switch. Reset red button and recheck for 24 volts. 1.201.0 Proceed with the following checks if the contactor is closed but the unit does not run. 1.201.1 Check 240 volt wire leads to the capacitors and the compressor. Make sure the terminals on the compressor and capacitors are not touching or loose. 1.201.2 Check for continuity across the three terminals of the compressor. The compressor windings are opened if you have no continuity. 1.201.3 Check for grounded compressor windings by checking continuity to ground. 1.201.4 The compressor may be tapped with a rubber mallet or piece of wood to jar the compressor loose. 1.201.5 Allow the compressor to cool below 130oF and check for continuity between terminals S&C on the compressor. The thermal protector may require more time to cool down if you do not have continuity. 1.201.6 Check capacitance of the run capacitor.


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NOTES FOR AIR CONDITIONING TROUBLESHOOTING GUIDE 2.101.0 Check to see if the outdoor fan motor is excessively hot as to cause the thermal-overload to function. Possible causes for outdoor fan motor to kick off on overload are: 1) Loose wire connections. 2) Excessive amp draw. 3) Bad motor bearings. 4) Excessively dirty coil cause restricted air flow. 5) Excessively hot air being pulled into unit. 2.101.1 Make sure wire leads to the motor are making a good connection. A loose connection will cause an excessive amp draw and overheat the motor. 2.101.2 Check for continuity on the motor windings as the motor itself may be defective. 2.101.3 Check for defective fan run capacitor. Use a meter on RX 100,000 scale-continuity-no needle deflection-capacitor open-replace capacitor. 2.102.0 Make sure the hot air being discharged is not recirculating back through the coil fins. 2.103.0 A slight restriction in the outdoor coil might cause an excessive head pressure which over time may cause the compressor to function on thermal-overload. Note: Water in the system may cause restriction after a period of time. 2.104.0 Check for overcharge by excessive liquid and suction line pressures. 2.105.0 If the suction pressure is low, add charge to see if the pressure comes up to what is specified in the instructions. 2.106.0 Check line voltage to the compressor to see if it is excessive or low. 2.107.0 A defective run capacitor can also cause the compressor to overheat. Check out run capacitor. 2.108.0 The compressor may be drawing excessive amp due to an internal defect such as bad bearings. 2.109.0 Possible causes of a high superheat (15 or higher) could be a faulty expansion valve or an extremely low charge. 3.101.0 A low suction pressure which could indicate the system is low on charge. Review the following items. 3.101.1 Dirty air filters may restrict the air flow across the indoor coil resulting in frost on the coil. 3.101.2 Is the duct system and air blower set up to move enough air to have a 18 - 20 F drop across the coil?


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NOTES FOR AIR CONDITIONING TROUBLESHOOTING GUIDE 3.101.3 Are there any registers or dampers closed restricting the air flow of the duct system? 3.101.4 If the indoor coil frosts, this indicates a low charge or insufficient air movement. 3.101.5 The coil may not frost up but still not cool properly if the system is slightly low on refrigerant. Check for a 180 F temperature drop across the coil. 3.101.6 Make sure the liquid line was not kinked slightly causing a restriction. 3.101.7 Hold bulb in hand to see if pressure changes (should increase pressures). 3.101.8 Check out the indoor blower to make sure it is functioning properly and not cutting out on thermal-overload. 3.201.0 Check the following items for high suction pressure and low liquid pressure. Allow at least 5 minutes off time for valve to close when pressures have equalized if compressor has internal pressure relief valve. 3.201.1 There may be a restriction in the high side coil. This could be caused by water or other matter in the system. A restriction in the coil is a very rare problem. 3.201.2 Check for restriction of expansion valve. 3.301.0 High suction and low superheat temperature. Review the following items. 3.301.1 The system will become flooded if the system is overcharged with refrigerant. Consequently, the indoor coil will not absorb the heat from the air flow. The temperature drop across the indoor coil will be low. 3.301.2 Check for proper size expansion valve.


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K. HOMEOWNER INFORMATION The following maintenance points should be reviewed periodically to assure that the air conditioning system will operate properly. 1) Keep clean air filters in the path of the air flow. If excessively dirty air filters are not changed, this will cause poor performance of the system, put unnecessary strain on the compressor and this may cause the system to lock out on the high pressure switch. Never operate system without clean air filters in place. 2) Keep the outside condenser coil clean by spraying with a garden hose from the inside of the coil outward.

:(REMOVE FUSE FROM POWER SOURCE BEFORE CLEANING THE CONDENSER COIL). If the air conditioning system will not operate, check the following points before calling a qualified serviceman. 1) Is the sub-base of the thermostat switched to the "COOL" position? 2) Is the temperature setting on the thermostat low enough to bring the air conditioner on? 3) If the fan motor or compressor have locked out on thermal-overload, it may be necessary to wait several hours before the unit will restart. If this happens with any regularity, call your local serviceman. NOTE: It is advisable to wax the outer surface of the condenser unit yearly to aid in protection from the weather. A good automotive grade of wax should be used.


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L. REPLACEMENT PARTS DIAGRAM


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M. REPLACEMENT PARTS LIST

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