Friedrich HAZARDGARG R-410A User's Manual
Contents
1. HAZARDOUS DUTY SPECIFICATIONS AND PERFORMANCE DATA Cooling Performance Data Er E CM BREAKER TEMP Er F CONDENSER E CM ELECTRICAL RATINGS RATINGS R 410A REF FUSE Discharge Suction Super Sub po TEMPERATURE Temp Temp PEE TT Voltage c QR Temp Drop F 9 Suction Discharge Amps Cool Amps Heat es fe Lom Charge in OZ ns sa 7 1 er te s co 4m o9 e s sa m e j m s m es e er xem Specifications Energy Efficiency Moisture Air Direction Room Side Air Cooling Capacity Electrical Characteristics 60 Hertz Ratio AHAM Removal Controls Circulation Model BTU Hr AHAM Volts Rated Amps Watts EER Pints Hr CFM SH15M30A 14500 14000 230 208 6 9 7 4 1495 1443 9 7 9 7 6 0 8 way 375 SH20M30A 19500 19000 230 208 9 1 10 0 2074 2021 9 4 9 4 4 0 8 way 375 Installation Information Circuit Rating Dimensions Breaker or Window Width Thru The Wall Inches Inches Finished Hole Inches T D Fuse Depth DepthJBox Minimum Minimum Overall to Louvers Extension Extension Height Width A B IntoRoom Outside Min Height Width Max Depth Volts Amps Net Shipping SH15M30A 15 156 25 156 27 3 8 6 3 146 16 5he 278 42 16 3 6 26 3 6 6 250 15A 156 168 SH20M30A 17 1546 25 156 27 3 8 6 3 146 16 1516 27 8 42 18 3 6 26 3 6 6 250V 15A 160 174 Due to continuing engineering research and technology2. Troubleshooting a restricted refrigerant system can be difficult The following procedures are the more common problems and solutions to these problems There are two types of refrigerant restrictions Partial restrictions and complete restrictions A partial restriction allows some of the refrigerant to circulate through the system With a complete restriction there is no circulation of refrigerant in the system Restricted refrigerant systems display the same symptoms as a low charge condition When the unit is shut off the gauges may equalize very slowly Gauges connected to a completely restricted system will run in a deep vacuum When the unit is shut off the gauges will not equalize at all A quick check for either condition begins at the evaporator With a partial restriction there may be gurgling sounds Accumulator Indoor Coil Deep Vacuum Compressor at the metering device entrance to the evaporator The evaporator in a partial restriction could be partially frosted or have an ice ball close to the entrance of the metering device Frost may continue on the suction line back to the compressor Often a partial restriction of any type can be found by feel as there is a temperature difference from one side of the restriction to the other With a complete restriction there will be no sound at the metering device entrance An amperage check of the compressor with a partial restriction may show normal curr
3. C 3 F 6 J 9 Month Manufactured A Jan D Apr G Jul K Oct B Feb E May H Aug L Nov C Mar F Jun J Sept M Dec HAZARDGARD APPLICATION UL Listed for use in Class 1 Division 2 Groups and D hazardous locations Hazardgard is specifically designed to cool living quarters storage areas and other enclosures situated in hazardous locations where specific volatile flammable liquids or gases are handled or used within enclosed containers or systems For more than 30 years the Friedrich Hazardgard has endured some of the toughest and most unforgiving operating conditions imaginable Time tested in the field where it counts Hazardgard is trusted by professionals who have to get the job done Robust engineering with design details like 3396 thicker fins extend the life of the coil Diamonblue Technology our anti corrosive treatment provides added endurance and protection in coastal or corrosive environments Up c UL Ideal applications Offshore oil rigs on shore oil company Office complexes where methane is a offices and refineries by product Petrochemical sites and propane fill up Hazardous materials storage stations Paint and varnish storage or processing plants Grain alcohol processors or storage sites Plant areas using strong solvents or chemicals Munitions plants or armories PVC or plastics plants and processing points Recycling plants Furniture refinishing stripping workshops Fertilizer plants
4. COOL ONLY MODELS SH15M30 A SH20M30 A WIRING DIAGRAM I COMPRESSOR TO CONTROL ASY GROUNDING SCREW SYSTEM SWITCH TOGGLE GREEN TO CHASSIS GROUND ORIENTATION MAY VARY REFER TO MARKINGS ON COMPRESSOR TO GROUNDING SCREW COMPRESSOR WIRE HARNESS CAPACITOR TERMINAL ORIENTATION MAY VARY REFER TO TERMINAL MARKINGS SOLID STATE RELAY 10 GROUND LEAD CAPACITOR COMBINATION TERMINAL COMPR COMPRESSOR MTR FAN MOTOR OVLD OVERLOAD PROTECTOR IDT INDOOR THERMOSTAT PART NO REV 921 002 00 27 28 FRIEDRICH Friedrich Air Conditioning Company P O Box 1540 San Antonio TX 78295 210 357 4400 www friedrich com HAZARDGARD ROOM AIR CONDITIONERS LIMITED WARRANTY LIMITED ONE YEAR PARTS WARRANTY 1 Limited warranty One year Friedrich warrants that it will provide a replacement for any part of this HazardGard Room Air Conditioner found defective in material or workmanship for a period of one 1 year from the date of original purchase 2 Limited warranty One year The Friedrich warranty also covers the cost of labor for repairing any compressor condenser evaporator or inter connecting tubing found defective within the warranty period providing the unit is returned to an authorized Friedrich Repair Station located within the Continental United States The Friedrich warranty does not cover 1 Any charges for removal transportation or reinstallation of the uni
5. MECHANICAL Periodically at least yearly or bi yearly inspect all control components electronic electrical and mechanical as well as the power supply Use proper testing instruments voltmeter ohmmeter ammeter wattmeter etc to perform electrical tests Use an air conditioning or refrigeration thermometer to check room outdoor and coil operating temperatures Use an electronic tester to measure wet bulb temperatures indoors and outdoors 21 22 ROUTINE MAINTENANCE Continued NOTICE Do not drill holes in the bottom of the drain pan or the underside of the unit Not following this notice could result in damage to the unit or condensate water leaking inappropriately which could cause water damage to surrounding property SLEEVE DRAIN Inspect the sleeve and drain system periodically at least yearly or bi yearly and clean of all obstructions and debris Clean both areas with an antibacterial and antifungal cleaner Rinse both items thoroughly with water and ensure that the drain outlets are operating correctly Check the sealant around the sleeve and reseal areas as needed FRONT COVER Clean the front cover when needed Use a mild detergent Wash and rinse with warm water Allow it to dry thoroughly before reinstalling it in the chassis CLEARANCES Inspect the surrounding area inside and outside to ensure that the unit s clearances have not been compromised or altered Slot Tab Return Air Grille
6. may require the use of multiple units to provide the optimal cooling solution 1 400 1 600 25 000 23 24 TROUBLESHOOTING Problem Possible Cause Possible Solution Power disconnected Check power source 4 Replace fuse reset breaker If repeats check fuse Branch circuit fuse blown or circuit or breaker size Check for shorts in unit wiring and breaker tripped Unit does not run components Loose or disconnected wiring at Check wiring amp connections Connect per wiring switch diagram Inoperative switch On Off Test for continuity 3 and 2 5 and 6 If bad replace Problem Possible Cause Possible Solution Dirty filter Clean as recommended in Owner s Manual Arion Check for dirty or obstructed coil clean as required E Inoperative thermostat Test for shorted thermostat or stuck contacts freezes up SPOT of refrigerant Device coil and check for leak freezes up Short of refrigerant De ice coil and check for leak De ice coil Check temperature differential Partially restricted capillary across coil Touch test coil return bends for same temperature Test for low running current Inoperative fan motor Test fan motor amp replace if inoperative Problem Possible Cause Possible Solution Excessive heat load Test cooling performance of unit Unit undersized a ee Check for partially iced coil Check temperature Restriction in line sp
7. Return air grille ROOM AIR CONDITIONER UNIT PERFORMANCE TEST DATA SHEET DATE MODEL SERIAL YES NO IS THERE A FRIEDRICH SLEEVE INSTALLED IS THERE A FRIEDRICH OUTDOOR GRILL INSTALLED IS MAINTENANCE BEING PERFORMED If NO is checked use back of sheet for explanation ELECTRICAL LINE VOLTAGE STATIC VOLTS STARTUP VOLTAGE VOLTS AMPERAGE DRAW AMPS COOL AMPERAGE DRAW AMPS HEAT COMPRESSOR LOCKED ROTORAMPS e AMPS RUNNING AMPERAGE DRAW AMPS INDOOR TEMPERATURES INDOOR AMBIENT TEMPERATURE a F RELATIVE HUMIDITY RH INDOOR a COOL HEAT DISCHARGE AIR TEMPERATURE INDOOR m F RETURN TEMPERATURE INDOOR E est F OUTDOOR TEMPERATURE OUTDOOR AMBIENT TEMPERATURE F RH OUTDOOR e DISCHARGE AIR TEMPERATURE OUTDOOR m F INTAKE AIR TEMPERATURE OUTDOOR z umm F APPLICATION USE ROOM RESIDENTIAL OR COMMERCIAL COOLING OR HEATING AREA W X Blocco SQ CU FT 5Izing your air conditioner correctly is vital Sizing Guide The following guide is based on normal room insulation average number of sun exposed windows and two person occupancy FT Btu h This is a general guide Please consult manual J or M for exact load calculations 1 600 1 900 28 000 1 900 2 700 36 000 Due to variations in room design climate zone and occupancy larger areas
8. start to the run connections S to The next highest resistance is from the start to the common connections S to C The lowest resistance is from the run to common C to R Before replacing a compressor check to be sure it is defective Check the complete electrical system to the compressor and compressor internal electrical system check to be certain that compressor is not out on internal overload Complete evaluation of the system must be made when ever you suspect the compressor is defective If the compressor has been operating for sometime a careful examination must be made to determine why the compressor failed NOTE OHM Figures are for examples only not actual values for the compressor 3 16 OHMS 49 OHMS 3 65 OHMS RESISTANCE RESISTANCE EQUALS RESISTANCE Many compressor failures are caused by the following conditions 1 Improper air flow over the evaporator 2 Overcharged refrigerant system causing liquid to be returned to the compressor 3 Restricted refrigerant system 4 Lack of lubrication 5 Liquid refrigerant returning to compressor causing oil to be washed out of bearings 6 Noncondensables such as air and moisture in the system Moisture is extremely destructive to a refrigerant system COMPRESSOR REPLACEMENT Recommended procedure for compressor replacement WARNING RISK OF ELECTRIC SHOCK Unplug and or disconnect all electrical power to t
9. systems An overcharged unit will at times return liquid refrigerant slugging back to the suction side of the compressor eventually causing a mechanical failure within the compressor This mechanical failure can manifest itself as valve failure bearing failure and or other mechanical failure The specific type of failure will be influenced by the amount of liquid being returned and the length of time the slugging continues Not enough refrigerant undercharge on the other hand will cause the temperature of the suction gas to increase to the point where it does not provide sufficient cooling for the compressor motor When this occurs the motor winding temperature will increase causing the motor to overheat and possibly cycle open the compressor overload protector Continued overheating of the motor windings and or cycling of the overload will eventually lead to compressor motor or overload failure Method Of Charging Repairs The acceptable method for charging the HazardGard system is the Weighed in Charge Method The weighed in charge method is applicable to all units It is the preferred method to use as itis the most accurate The weighed in method should always be used whenever a charge is removed from a unit such as for a leak repair compressor replacement or when there is no refrigerant charge left in the unit To charge by this method requires the following steps 1 Install a piercing valve to remove refrigerant from
10. 501 THE FIELD PROVIDED CIRCUIT PROTECTION DEVICE HACR CIRCUIT BREAKER OR TIME DELAY FUSE MUST NOT EXCEED THE AMPACITY INDICATED ON THE PRODUCT NAMEPLATE IMPORTANT Before you begin the actual installation of your air conditioner check local electrical codes and the information below Your air conditioner must be connected to a power supply with the same A C voltage and frequency hertz as marked on the data plate located on the chassis Only alternating current A C no direct current D C can be used An overloaded circuit will invariably cause malfunction or failure of the air conditioner therefore it is extremely important that the electrical power is adequate Consult your power company if in doubt Model Number Connection Type HAZARDGARD SPECIAL FEATURES Permanent Split Capacitor totally enclosed fan motor to assure efficient operation even under adverse electrical conditions Motor has a special stainless steel shaft to resist corrosion and a hermetically sealed overload for arc free operation High capacity compressor with internal hermetically sealed overload e Solid state relay contains transient voltage suppressor to protect controls against transient voltage spikes Provides solid state switches for arc free operation Hot gas bypass low ambient control to permit operation without freezing at outdoor ambient temperatures as low as 45 F 7 C Environmentally sealed on off switch and
11. NT TESTING FAN MOTOR A 230 volt single phase permanent split capacitor motor is used to drive the evaporator blower and condenser fan Arunning capacitor is wired across the start and run terminals of the motor The motor is totally enclosed and is protected with a line volt age overload located internally of the motor The motor shaft is stainless steel to resist corrosion FAN MOTOR WARNING ELECTRIC SHOCK HAZARD Disconnect power to the unit before servicing Failure to follow this warning could result in serious injury or death FAN MOTOR TEST 1 Determine that the capacitor is good 2 Perform continuity test on windings to determine if open shorted or okay SOLID STATE RELAY Two 50 amp rated 208 230 volt solid state relays are used to energize the compressor and fan motor Terminals 3 and 4 are the 208 230 volt line side Terminals 1 and 2 are load side contacts Line side p aa Ad SOLID STATE RELAY LED indicates contacts closed when lit SYSTEM CONTROL SWITCH This switch is double pole single throw Check for continuity between terminals 2 and 3 and 5 and 6 SWITCH ON OFF NS 6 CAPACITORS WARNING ELECTRIC SHOCK HAZARD Turn off electric power before servicing Discharge capacitor with a 20 000 Ohm 2 Watt resistor before handling Failure to do so may result in personal injury or death Many motor capacitors are internally fused Shorting the t
12. Service Manual 3 FRIEDRICH 2010 Hazardous Duty Room Air Conditioner nazardgard R 410A Models Cool Only SH15M30A SH20M30A HG ServMan 4 10 Table Of Contents INOrmatioi t ETT 2 4 TON P PO 4 FOC AMON EET o oc 5 al FOG Vi T RES 6 Performance Specifications and Installation Data tita iban iia niece Pea derit Pee Gd t i 7 eee De A E E 8 HazardGard Special F Cal CS a aS 9 componen DSTO MONS 10 Component Rm 11 12 R 410A Sealed System Repair Considerations ccccccccecccssccceeeeceeeeceeecaeceseaeeceaeeseuseseeeeseeesseeesegeesneegs 13 Sealed Refrigeration System Repairs 14 17 Pee rele hel MeN QING Mmm 14 17 Sale CINCO SCIRE mmm 18 19 Compressor Replacement 19 20 Maintenant 21 22 Performance Test Data Sheet E I 23 SIV OO NNO m 24 26 Winng 1 5 27 28 EI ege ic itt m TT T RR 29 IMPORTANT SAFETY INFORMATION The informati
13. ailure to follow proper safety procedures and or these warnings can result in serious injury or death MECHANICAL HAZARDS Extreme care proper judgment and all safety procedures must be followed when testing troubleshooting handling or working around unit with moving and or rotating parts Be careful when handling and working around exposed edges and corners of sleeve chassis and other unit components especially the sharp fins of the indoor and outdoor coils Use proper and adequate protective aids such as gloves clothing safety glasses etc Failure to follow proper safety procedures and or these warnings can result in serious injury or death PROPERTY DAMAGE HAZARDS FIRE DAMAGE HAZARDS Read the Installation Operation Manual for this air conditioning unit prior to operating Use air conditioner on a single dedicated circuit within the specified amperage rating Connect to a properly grounded outlet only Do not remove ground prong of plug Do not cut or modify the power supply cord Do not use extension cords with the unit Failure to follow these instructions can result in fire and minor to serious property damage WATER DAMAGE HAZARDS Improper installation maintenance or servicing of the air conditioner unit or not following the above Safety Warnings can result in water damage to personal items or property Insure that the unit has a sufficient pitch to the outside to allow water to drain from the unit Do not dril
14. ake necessary sealed system repairs and vacuum system Crimp process tube line and solder end shut Do not leave a service valve in the sealed system 9 High Pressure Gauge 0 to 750 Ibs 10 Low Pressure Gauge 30 to 200 Ibs 11 Vacuum Gauge 0 1000 microns 12 Facilities for flowing nitrogen through refrigeration tubing during all brazing processes EQUIPMENT MUST BE CAPABLE OF Recovering refrigerant to EPA required levels 2 Evacuation from both the high side and low side of the system simultaneously 3 Introducing refrigerant charge into high side of the system 4 Accurately weighing the refrigerant charge introduced into the system Proper refrigerant charge is essential to proper unit operation Operating a unit with an improper refrigerant charge will result in reduced performance capacity and or efficiency Accordingly the use of proper charging methods during servicing will insure that the unit is functioning as designed and that its compressor will not be damaged Too much refrigerant overcharge in the system is just as bad if not worse than not enough refrigerant undercharge They both can be the source of certain compressor failures if they remain uncorrected for any period of time Quite often other problems such as low air flow across evaporator etc are misdiagnosed as refrigerant charge problems The refrigerant circuit diagnosis chart will assist you in properly diagnosing these
15. ase pan and onto the condenser coil thus lowering the temperature and pressures within the coil B Electrical components Thermostat Control Used to maintain the specified room side comfort level System Switch Used to regulate the operation of the fan motor and the compressor or to turn the unit off For troubleshooting refer to the wiring diagrams and schematics in the back of this service manual Solid State Relay Used to energize the compressor and fan motor Each unit has 2 50 amp 208 230 volt relays Capacitor Reduces line current and steadies the voltage supply while greatly improving the torque characteristics of the fan motor and compressor motor Fan Motor Dual shafted fan motor operates the indoor blower wheel and the condenser fan blade simultaneously C Hermetic components Compressor Motorized device used to compress refrigerant through the sealed system Low ambient bypass hot gas bypass valve Used for low ambient cooling operation the valve is connected between the discharge line at the compressor and the suction process tube It responds to suction pressure whcih when reduced in the system causes the valve to open and bypass hot gas from the high pressure side to the low pressure side of the system The valve is preset to open when the suction pressure reaches 50 psig Capillary tube A cylindrical meter device used to evenly distribute the flow of refrigerant to the heat exchangers coils COMPONE
16. dable cleaning agent and degreaser to prevent damage to the coil and or base pan AIR FILTER Clean the unit air intake filter at least every 300 to 350 hours of operation Clean the filters with a mild detergent in warm water and allow to dry thoroughly before reinstalling COILS AND BASE PAN The indoor coil evaporator coil the outdoor coil condenser coil and base pan should be inspected periodically yearly or bi yearly and cleaned of all debris lint dirt leaves paper etc Clean the coils and base pan with a soft brush and compressed air or vacuum If using a pressure washer be careful not to bend the aluminium fin pack Use a sweeping up and down motion in the direction of the verti cal aluminum fin pack when pressure cleaning coils Cover all electrical components to protect them from water or spray Allow the unit to dry thoroughly before reinstalling it in the sleeve BLOWER WHEEL HOUSING CONDENSER FAN SHROUD Inspect the indoor blower housing evaporator blade con denser fan blade and condenser shroud periodically yearly or bi yearly and clean of all debris lint dirt mold fungus etc Clean the blower housing area and blower wheel with an antibacterial antifungal cleaner Use a biodegradable cleaning agent and degreaser on condenser fan and con denser shroud Use warm or cold water when rinsing these items Allow all items to dry thoroughly before reinstalling them ELECTRONIC ELECTRICAL
17. ed properly a shorted or grounded running capacitor will result in a direct short to ground from the R terminal and will blow the line fuse The motor protector will protect the main winding from excessive temperature 11 12 THERMOSTAT A cross ambient thermostat is used to maintain the desired comfort level The thermostat reacts only to a change in temperature at the bulb location Important to the successful operation of the unit is the position of the sensing bulb in relation to the evaporator SENSING BULB LOCATION RANGE Thermostat Part No 618 225 002 60 F 2 to 90 F 4 WARNING ELECTRIC SHOCK HAZARD Disconnect power to the unit before servicing Failure to follow this warning could result in serious injury or death TESTING THE THERMOSTAT Remove the wires from the thermostat Turn the thermostat to its coldest position Check to see if there is continuity between the two terminals Turn the thermostat to its warmest position Check continuity to see if the thermostat contacts open Note The temperature must be within the range listed to check the thermostat Refer to the troubleshooting section in this manual for additional information on thermostat testing LOW AMBIENT BYPASS VALVE A WARNING HIGH PRESSURE HAZARD Sealed Refrigeration System contains refrigerant and oil under high pressure Proper safety procedures must be followed and proper protective clothing m
18. ent when compared to the unit specification With a complete restriction the current drawn may be considerably less than normal as the compressor is running in a deep vacuum no load Much of the area of the condenser will be relatively cool since most or all of the liquid refrigerant will be stored there The following conditions are based primarily on a system in the cooling mode Head Pressure Lower Outdoor Coll Gauges will not equalize with unit shut off Completely Restricted System Accumulator Suction Pressure Indoor Coil Lower Outdoor Coil Gauges may equalize very slowly Partially Restricted System 17 18 COMPRESSOR CHECKS ELECTRIC SHOCK HAZARD Turn off electric power before service or installation Extreme care must be used if it becomes necessary to work on equipment with power applied Failure to do so could result in serious injury or death Locked Rotor Voltage L R V Test Locked rotor voltage L R V is the actual voltage available at the compressor under a stalled condition Single Phase Connections Disconnect power from unit Using a voltmeter attach one lead of the meter to the run R terminal on the compressor and the other lead to the common terminal of the com pressor Restore power to unit Determine L R V Start the compressor with the volt meter attached then stop the unit Attempt to restart the compressor within a couple of seconds a
19. eparate circuit for proper voltage and be fused Compressor separately start or runs for short periods Shorted or incorrect capacitor or incorrect Shorted or incorrect capacitor Replace capacitor capacitor only Cycles on h overoad estricted or low air flow throug Check moor condenser coil Check for refrigerant restriction blocked airflow Compressor running abnormally hot loose wires at compressor terminals and fan motor capacitor voltage Change compressor if all other corrections above Overload opens too soon are normal Problem Possible Cause Possible Solution Low or fluctuating voltage Check continuity of thermostat at coldest setting If compressor runs replace thermostat Low voltage supply road nameplate voltage Provide proper Thermostat contacts not closing Compressor does owitch On Off inoperative Test for continuity not start fan Defective capacitor Defective capacitor Test with Test with analyzer replace f needed replace Test with analyzer replace f needed needed motor runs Compressor internal overload Check voltage at compressor terminals If voltage open is satisfactory replace compressor Solid state relay open Replace relay Open or shorted compressor Check windings for continuity and resistance If windings open replace compressor Problem Possible Cause Possible Solution Set to coldest position Test ther
20. erminals will blow the fuse ruining the capacitor A 20 000 ohm 2 watt resistor can be used to discharge capacitors safely Remove wires from capacitor and place resistor across terminals When checking a dual capacitor with a capacitor analyzer or ohmmeter both sides must be tested Capacitor Check with Analyzer The capacitor analyzer will show whether the capacitor is open or shorted It will tell whether the capacitor is within its micro farads rating and it will show whether the capacitor is operating at the proper power factor percentage The instrument will automatically discharge the capacitor when the test switch is released Capacitor Capacitor Connections The starting winding of a motor can be damaged by a shorted and grounded running capacitor This damage usually can be avoided by proper connection of the running capacitor terminals From the supply line on a typical 230 volt circuit a 115 volt potential exists from the R terminal to ground through a possible short in the capacitor However from the S or start terminal a much higher potential possibly as high as 400 volts exists because of the counter EMF generated in the start winding Therefore the possibility of capacitor failure is much greater when the identified terminal is connected to the S or start terminal The identified terminal should always be connected to the supply line or terminal never to the S terminal When connect
21. ervicing Failure to follow this warning could result in serious injury or death INTERNAL OVERLOAD The compressors are equipped with an internal overload The overload is embedded in the motor windings to sense the winding temperature and or current draw The overload is connected in series with the common motor terminal Should the internal temperature and or current draw become excessive the contacts in the overload will open turning off the compressor The overload will automatically reset but may require several hours before the heat is dissipated CHECKING THE INTERNAL OVERLOAD Internal Overload LINE BREAK INTERNAL OVERLOAD OHMMETER 1 With no power to unit remove the leads from the com pressor terminals 2 Using an ohmmeter test continuity between terminals C S and C R If no continuity the compressor overload is open and the compressor must be replaced Single Phase Resistance Test Remove the leads from the compressor terminals and set the ohmmeter on the lowest scale R x 1 Touch the leads of the ohmmeter from terminals common to start C to S Next touch the leads of the ohmmeter from terminals common to run C to R Add values C to S and C to R together and check resistance from start to run terminals S to R Resistance S to R should equal the total of C to S and C to In a single phase PSC compressor motor the highest value will be from the
22. fire proof materials Have a fire extinguisher readily available Failure to follow this notice could result in moderate to serious property damage 19 20 3 After all refrigerant has been recovered disconnect suction and discharge lines from the compressor and remove compressor Be certain to have both suction and discharge process tubes open to atmosphere 4 Carefully pour a small amount of oil from the suction stub of the defective compressor into a clean container 5 Using an acid test kit one shot or conventional kit test the oil for acid content according to the instructions with the kit 6 If any evidence of a burnout is found no matter how slight the system will need to be cleaned up following proper procedures 7 Install the replacement compressor WARNING EXPLOSION HAZARD The use of nitrogen requires a pressure regulator Follow all safety procedures and wear protective safety clothing etc Failure to follow proper safety procedures result in serious injury or death 8 Pressurize with a combination of R 410A and nitrogen and leak test all connections with an electronic or Halide leak detector Recover refrigerant and repair any leaks found Repeat Step 8 to insure no more leaks are present 9 Evacuate the system with a good vacuum pump capable of a final vacuum of 200 microns or less The system should be evacuated through both liquid line and suction line gauge ports While the unit
23. frigerant Systems An undercharged system will result in poor performance low pressures etc in both the heating and cooling cycle Whenever you service a unit with an undercharge of refrigerant always suspect a leak The leak must be repaired before charging the unit To check for an undercharged system turn the unit on allow the compressor to run long enough to establish working pressures in the system 15 to 20 minutes During the cooling cycle you can listen carefully at the exit of the metering device into the evaporator an intermittent hissing and gurgling sound indicates a low refrigerant charge Intermittent frosting and thawing of the evaporator is another indication of a low charge however frosting and thawing can also be caused by insufficient air over the evaporator Checks for an undercharged system can be made at the compressor If the compressor seems quieter than normal it is an indication of a low refrigerant charge Overcharged Refrigerant Systems Compressor amps will be near normal or higher Noncondensables can also cause these symptoms To confirm remove some of the charge if conditions improve system may be overcharged If conditions don t improve Noncondensables are indicated Whenever an overcharged system is indicated always make sure that the problem is not caused by air flow problems Improper air flow over the evaporator coil may indicate some of the same symptoms as an over charged syste
24. gold plated contacts in thermostat for corrosion resistance Electrodeposited epoxy primer and alkyd enamel both oven baked for an attractive long lasting finish Copper tubing aluminum fin coils Galvanized steel cabinet and base pan all bonderized Slide out chassis for easy installation in window through the wall Extra insulation inside including completely insulated plenum chamber for quieter more efficient cooling Entire unit test run in environmental chamber before crating Eight way air flow control for uniform air circulation Condensate drain with exclusive mosquito trap 15 amp circuit with time delay fuse required Accommodates direct wiring Long lasting 3 8 10mm thick air filter germicidally treated easily removed for cleaning Friedrich Air Conditioning quality has been proven by more than 25 years of successful experience from the Gulf of Mexico to the searing sands of the Arabian desert Control Panel Function Control Power This switch is a double pole single throw toggle switch ON Turns everything on OFF Turns everything off Temperature Control The knob at the bottom is the thermostat which is a cross ambient type used to maintain the desired comfort level The thermostat reacts only to a change in temperature at the bulb location turn the knob clockwise to set cooler counterclockwise for warmer Exclusive Friedrich leads with the first UL Lis
25. hands Use air conditioner on a single dedicated circuit within the specified amperage rating Use on a properly grounded outlet only Do not remove ground prong of plug Do not cut or modify the power supply cord Do not use extension cords with the unit Follow all safety precautions and use proper and adequate protective safety aids such as gloves goggles clothing adequately insulated tools and testing equipment etc Failure to follow proper safety procedures and or these warnings can result in serious injury or death REFRIGERATION SYSTEM HAZARDS Use approved standard refrigerant recovering procedures and equipment to relieve pressure before opening system for repair Do not allow liquid refrigerant to contact skin Direct contact with liquid refrigerant can result in minor to moderate injury Be extremely careful when using an oxy acetylene torch Direct contact with the torch s flame or hot surfaces can cause serious burns Make sure to protect personal and surrounding property with fire proof materials Have a fire extinguisher at hand while using a torch Provide adequate ventilation to vent off toxic fumes and work with a qualified assistant whenever possible Always use a pressure regulator when using dry nitrogen to test the sealed refrigeration system for leaks flushing etc Make sure to follow all safety precautions and to use proper protective safety aids such as gloves safety glasses clothing etc F
26. he unit before performing inspections maintenances or service Failure to do so could result in electric shock serious injury or death 1 Be certain to perform all necessary electrical and refrigeration tests to be sure the compressor is actually defective before replacing WARNING HIGH PRESSURE HAZARD Sealed Refrigeration System contains refrigerant and oil under high pressure Proper safety procedures must be followed and proper protective clothing must be worn when working with refrigerants Failure to follow these procedures could result in serious injury or death 2 Recover all refrigerant from the system though the process tubes PROPER HANDLING OF RECOVERED REFRIGERANT ACCORDING TO EPA REGULATIONS IS REQUIRED Do not use gauge manifold for this purpose if there has been a burnout You will contaminate your manifold and hoses Use a Schrader valve adapter and copper tubing for burnout failures WARNING HIGH TEMPERATURES Extreme care proper judgment and all safety procedures must be followed when testing troubleshooting handling or working around unit while in operation with high temperature yy aa components Wear protective safety aids such as gloves clothing etc Failure to do so could result in serious burn injury NOTICE FIRE HAZARD The use of a torch requires extreme care and proper judgment Follow all safety recommended precautions and protect surrounding areas with
27. is being evacuated seal all openings on the defective compressor Compressor manufacturers will void warranties on units received not properly sealed Do not distort the manufacturers tube connections CAUTION FREEZE HAZARD Proper safety procedures must be followed and proper protective clothing must be worn when working with liquid refrigerant Failure to follow these procedures could result in minor to moderate injury 10 Recharge the system with the correct amount of refrigerant The proper refrigerant charge will be found on the unit rating plate The use of an accurate measuring device such as a charging cylinder electronic scales or similar device is necessary SPECIAL PROCEDURE IN THE CASE OF MOTOR COMPRESSOR BURNOUT WARNING ELECTRIC SHOCK HAZARD Turn off electric power before service or installation Failure to do so may result in personal injury or death WARNING HIGH PRESSURE HAZARD Sealed Refrigeration System contains refrigerant and oil under high pressure Proper safety procedures must be followed and proper protective clothing must be worn when working with refrigerants Failure to follow these procedures could result in serious injury or death WARNING EXPLOSION HAZARD The use of nitrogen requires a pressure regulator Follow all safety procedures and wear protective safety clothing etc Failure to follow proper safety procedures result in serious injur
28. l holes in the bottom of the drain pan or the underside of the unit Failure to follow these instructions can result in result in damage to the unit and or minor to serious property damage INTRODUCTION This service manual is designed to be used in conjunction with the operation and installation manual provided with each unit This service manual was written to assist the professional HVAC service technician to quickly and accurately diagnose and repair any malfunctions of this product This manual therefore will deal with all subjects in a general nature i e All text will pertain to all models IMPORTANT It will be necessary for you to accurately identify the unit you are servicing so you can be certain of a proper diagnosis and repair See Unit Identification Latch Return air grille UNIT IDENTIFICATION Model Number Code SH15M3 0 A 8th Digit Engineering 1st Digit Function Major change S Straight Cool Value Series 7th Digit Options 0 Straight Cool amp H HazardGard 3rd and 4th Digit Approximate 6th Digit Voltage 3 230 208 Volts BTU HR Cooling Heating BTU Hr capacity listed in the 5th Digit Specifi cation Performance Data Section Alphabetical Modifier RAC Serial Number Identification Guide Serial Number 00001 Decade Manufactured L 0 C 3 F 6 Production Run Number A 1 D 4 G 7 B 2 E 5 H 8 Year Manufactured Product Line A 1 D 4 G 7 B 2 E 5 H 8
29. lit across coil Check for presence of oil on silver soldered Refrigerant leak connections Check for partially iced coil Check split across coil Check for low running amperage Compressor runs continually Does not cycle off Check operation of thermostat Replace if contacts Thermostat contacts stuck i remain closed Incorrect thermostat setting Set to correct setting Possible Cause Possible Solution Loss of charge in thermostat bulb Replace thermostat Thermostat Thermostat contacts open ye ao at terminals 1 and 2 Replace if does not turn on COMPFESsOr Incorrect wiring or loose wires Connect per wiring diagram Tighten loose wires System switch open Test for continuity at switch terminals 2 and 3 Possible Cause Possible Solution Thermostat set at coldest point Adjust Disconnect power to the unit Remove cover of Thermostat contacts stuck thermostat and check if contact is stuck if so replace thermostat Switch On Off shorted Test switch for open contacts at terminals 2 and 3 with switch in Off position Thermostat does not turn off compressor TROUBLESHOOTING Problem Possible Cause Possible Solution Compressor attempts to start before system pressures are equalized Allow a minimum of 3 minutes to allow pressures to equalize before attempting to start Check voltage with unit operating Check for other appliances on the circuit Unit should be on s
30. m An overcharge can cause the compressor to fail since it would be slugged with liquid refrigerant The charge for any system is critical When the compressor is noisy suspect an overcharge when you are sure that the air quantity over the evaporator coil is correct Icing WARNING HIGH PRESSURE HAZARD Sealed Refrigeration System contains refrigerant and oil under high pressure Proper safety procedures must be followed and proper protective clothing must be worn when working with refrigerants Failure to follow these procedures could result in serious injury or death A check of the amperage drawn by the compressor motor should show a lower reading Check the Unit opecification After the unit has run 10 to 15 minutes check the gauge pressures Gauges connected to system with an undercharge will have low head pressures and substantially low suction pressures Compressor Reversing Compressor Running Quieter than Normal Amps Lower Accumulator Suction Pressure Indoor Coil Much Lower Undercharged System of the evaporator will not be encountered because the refrigerant will boil later if at all Gauges connected to system will usually have higher head pressure depending upon amount of over charge Suction pressure should be slightly higher Accumulator Suction Pressure Noticeably High Compressor Slugged with Refrigerant Overcharged System Restricted Refrigerant System
31. mostat and replace if necessary Dirty air filter Clean as recommended in Owner s Manual Dirty or plugged condenser or Does not cool or evaporator coil cools only slightly Thermostat open or inoperative Clean coils Adjust air louvers Check application Check for dirty filter or evap coil Check fan motor Correct as needed Poor air circulation in area being cooled Low capacity undercharge Check for leak and make necessary repairs Compressor not pumping properly Replace compressor NOTE If Inside Coil Freezes Up Your Friedrich Hazardgard is designed not to freeze with outdoor temperatures as low as 45 F 7 C If the indoor coil should ice over while cooling set the thermostat to the warmest position until the ice on the coil is gone Setting the thermostat to a slightly warmer position will probably keep ice from forming on the coil A dirty filter will contribute to icing TROUBLESHOOTING Problem Possible Cause Possible Solution Defective switch On Off Check continuity across terminals 2 and 3 Fan capacitor open Test with capacitor analyzer Replace if bad Check power and if okay perform continuity test Inoperative fan motor Replace if bad Fan motor does Incorrect wiring of fan circuit Connect per wiring diagram not run Solid state relay open Replace relay Seized motor bearings Replace motor Bound fan blade or blower wheel Adjust for proper clearance P
32. nd immediately read the voltage on the meter The compressor under these conditions will not start and will usually kick out on overload within a few seconds since the pressures in the system will not have had time to equalize Voltage should be at or above minimum voltage of 197 VAC as specified on the rating plate If less than minimum check for cause of inadequate power supply 1 incorrect wire size loose electrical connections etc Amperage L R A Test The running amperage of the compressor is the most impor tant of these readings Arunning amperage higher than that indicated in the performance data indicates that a problem exists mechanically or electrically Single Phase Running and L R A Test NOTE Consult the specification and performance section for running amperage The L R A can also be found on the rating plate WARNING ELECTRIC SHOCK HAZARD Turn off electric power before service or installation Extreme care must be used if it becomes necessary to work on equipment with power applied Failure to do so could result in serious injury or death Select the proper amperage scale and clamp the meter probe around the wire to the C terminal of the compressor Turn on the unit and read the running amperage on the me ter If the compressor does not start the reading will indicate the locked rotor amperage L R A WARNING ELECTRIC SHOCK HAZARD Disconnect power to the unit before s
33. nder high pressure Do not puncture heat expose to flame or incinerate Only certified refrigeration technicians should service this equipment R410A systems operate at higher pressures than R22 equipment Appropriate safe service and handling practicces must be used Only use gauge sets designed for use with R410A Do not use standard R22 gauge sets The following is a list of important considerations when working with R 410A equipment R 410A pressure is approximately 60 higher than R 22 pressure R 410A cylinders must not be allowed to exceed 125 F they may leak or rupture R 410A must never be pressurized with a mixture of air it may become flammable Servicing equipment and components must be specifically designed for use with R 410A and dedicated to prevent contamination Manifold sets must be equipped with gauges capable of reading 750 psig high side and 200 psig low side with a 500 psig low side retard Gauge hoses must have a minimum 750 psig service pressure rating Recovery cylinders must have a minimum service pressure rating of 400 psig DOT 4BA400 and DOT BW400 approved cylinders POE Polyol Ester lubricants must be used with R 410A equipment To prevent moisture absorption and lubricant contamination do not leave the refrigeration system open to the atmosphere longer than 1 hour Weigh in the refrigerant charge into the high side of the system Introduce liquid refrigerant charge into the high
34. on contained in this manual is intended for use by a qualified service technician who 15 familiar with the safety procedures required for installation and repair and who is equipped with the proper tools and test instruments required to service this product Installation or repairs made by unqualified persons can result in subjecting the unqualified person making such repairs as well as the persons being served by the equipment to hazards resulting in injury or electrical shock which can be serious or even fatal Safety warnings have been placed throughout this manual to alert you to potential hazards that may be encountered If you install or perform service on equipment it is your responsibility to read and obey these warnings to guard against any bodily injury or property damage which may result to you or others Your safety and the safety of others are very important We have provided many important safety messages in this manual and on your appliance Always read and obey all safety messages This is a safety Alert symbol This symbol alerts you to potential hazards that can kill or hurt you and others All safety messages will follow the safety alert symbol with the word WARNING or CAUTION These words mean A WARN N G You can be killed or seriously injured if you do not follow instructions A CAUTION You can receive minor or moderate injury if you do not follow instructions All safety messages will tell you what the po
35. ressway San Antonio Texas 78218 5212 210 357 4400 877 599 5665 x 846 FAX 210 357 4490 Email tac friedrich com www friedrich com Printed in the U S A 29 NOTES 2 FRIEDRICH FRIEDRICH AIR CONDITIONING CO Post Office Box 1540 San Antonio Texas 78295 1540 4200 Pan Am Expressway San Antonio Texas 78218 5212 210 357 4400 FAX 210 357 4490 www friedrich com Printed in the U S A HG ServMan 4 10
36. roblem Possible Cause Possible Solution Switch On Off does not cut fan motor off Defective On Off switch or defective relay Replace switch or relay Problem Possible Cause Refer to installation instructions for proper Poor installation installation LED SIRING ieee a Adjust fan blade or blower wheel clearance blower wheel housing Check for deteriorated compressor grommets Replace as needed Noisy and or vibration Compressor vibrating Loose cabinet parts improperly mounted components tubing Adjust and tighten as required rubbing Problem Possible Cause Possible Solution Evaporator drain pan overflowing Clean obstructed drain trough Condensation forming on bottom of Evaporator drain pan broken cracked Replace Water leaks into base pan chassis seal gasket missing or defective Water dripping from discharge air Dirty evaporator coil or extremely high humidity grilles conditions Clean coil or check application Problem Possible Cause Possible Solution Extremely high humid conditions Install 01900 235 drain kit Water in center section of base pan Drain trough Check level Ensure 1 4 tilt toward Excessive water compressor area rear leaks outside Dirty condenser coil Clean with steam or detergent Fan blade and slinger ring Adjust fan blade to 1 2 clearance from condenser improperly positioned coil ELECTROMECHANICAL CONTROL
37. side of the system For low side pressure charging of R 410A use a charging adaptor Use Friedrich approved R 410A filter dryers only 13 14 R 410A SEALED REFRIGERATION SYSTEM REPAIRS IMPORTANT SEALED SYSTEM REPAIRS COOL ONLY MODELS REQUIRE THE INSTALLATION OF A LIQUID LINE DRIER EQUIPMENT REQUIRED 1 Voltmeter 2 Ammeter 3 Ohmmeter 4 Approved Refrigerant Recovery System 5 Vacuum Pump capable of 200 microns or less vacuum o Acetylene Welder Electronic Halogen Leak Detector capable of detecting HFC Hydrofluorocarbon refrigerants 8 Accurate refrigerant charge measuring device such as a Balance Scales 1 2 oz accuracy b Charging Board 1 2 oz accuracy WARNING RISK OF ELECTRIC SHOCK Unplug and or disconnect all electrical power to the unit before performing inspections maintenances or service Failure to do so could result in electric shock serious injury or death WARNING HIGH PRESSURE HAZARD Sealed Refrigeration System contains refrigerant and oil under high pressure Proper safety procedures must be followed and proper protective clothing must be worn when working with refrigerants Failure to follow these procedures could result in serious injury or death Refrigerant Charging NOTE Because the HazardGard system is a sealed system service process tubes will have to be installed First install a line tap and remove refrigerant from system M
38. specifications are subject to change without notice Manufactured under U S Design Patent DES 368 306 decorative front Utility Patent 5 622 058 MAXIMUM outdoor ambient operating temperature is 130 F MAXIMUM TEMPERATURE RATING FOR CLASS 1 DIVISION 2 GROUPS A B C D OPERATING TEMPERATURE CODE T3B pd tae Pye T UST NSW 1 DiamonhlueTechnology I d PROTECTS AGAINST CORROSION AND EXTENDS THE LIFE OF THE UNIT SIDE VIEW STANDARD ON ALLM ODELS Junction This advanced corrosion protection Box treatment protects the outdoor coil against deterioration and extends the life of the unit especially in harsh coastal environments All models use environmentally friendly R 410A refrigerant Front ELECTRICAL DATA WARNING ELECTRIC SHOCK HAZARD Turn off electric power before service or installation All electrical connections and wiring MUST be installed by a qualified electrician and conform to the National Electrical Code and all local codes which have jurisdiction Failure to do so can result in personal injury or death NOTICE FIRE HAZARD Not following the above WARNING could result in fire or electrically unsafe conditions which could cause moderate or serious property damage Read understand and follow the above warning ELECTRICAL REQUIREMENTS ALL FIELD WIRING MUST MEET THE REQUIREMENTS OF THE NATIONAL ELECTRICAL CODE ANSI NFPA 70 ARTICLE
39. t 2 the cost of labor to replace parts other than those described above and 3 does not apply to any HazardGard Room Air Conditioner that has been subject to a accident misuse flood fire or neglect b repairs or alterations outside of the Friedrich Authorized Dealer or Service Center so as to affect adversely its performance and reliability or any repairs or servicing as a result of using parts not sold or approved by Friedrich LIMITATIONS This warranty is a LIMITED warranty Anything in the warranty notwithstanding IMPLIED WARRANTIES FOR PARTICULAR PURPOSE AND MERCHANTABILITY SHALL BE LIMITED TO THE DURATION OF THE EXPRESS WARRANTY MANUFACTURER EXPRESSLY DISCLAIMS AND EXCLUDES ANY LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES FOR BREACH OF ANY EXPRESSED OR IMPLIED WARRANTY Performance of Friedrich s Warranty obligation is limited to one of the following methods 1 Repair of the unit 2 Arefund to the customer for the prorated value of the unit based upon the remaining warranty period of the unit 3 Providing a replacement unit of equal value The method of fulfillment of the warranty obligation is at the sole discretion of Friedrich Air Conditioning WARNING EXPLOSION HAZARD SUBSTITUTION OF COMPONENTS MAY IMPAIR SUITABILITY FOR CLASS 1 DIVISION 2 TECHNICAL SUPPORT CONTACT INFORMATION FRIEDRICH FRIEDRICH AIR CONDITIONING CO Post Office Box 1540 San Antonio Texas 78295 1540 4200 N Pan Am Exp
40. ted Room Air Conditioners designed to cool living quarters and other enclosures situated in hazardous locations where specific volatile flammable liquids or gases are handled or used with enclosed containers or systems Friedrich Hazardgard room air conditioners are designed to meet the National Electrical Code Article 500 requirements for Class l Division 2 Groups A B C D Hazardous locations and are the only air conditioners UL Listed for this application THIS UNIT IS LISTED BY UNDERWRITERS LABORATORIES FOR USE IN CLASS I DIVISION 2 GROUPS A C D HAZARDOUS LOCATIONS Operating Temperature Code T3B Nazardgard ROOM AIR CONDITIONER FOR USE IN HAZARDOUS LOCATIONS CLASS DIVISION 2 GROUPS A B C D OPERATING TEMPERATURE CODE T3B 0 0 LISTED 933X THIS EQUIPMENT MUST BE INSTALLED PER NATIONAL ELECTRIC CODE NFPA 70 ARTICLE 501 Power OFF ON Warmer Cooler Wait three minutes before restarting COMPONENT DEFINITIONS A Mechanical components Plenum assembly Diffuser with directional louvers used to direct the conditioned airflow Blower wheel Attaches to the indoor side of the fan motor shaft and is used for distributing unconditioned room side air through the heat exchanger and delivering conditioned air into the room Slinger fan blade Attaches to the outdoor side of the fan motor shaft and is used to move outside air through the condenser coil while slinging condensate water out of the b
41. tential hazard is tell you how to reduce the chance of injury and tell you what will happen if the instructions are not followed A message to alert you of potential property damage will have the N O word NOTICE Potential property damage can occur if instructions are not followed PERSONAL INJURY OR DEATH HAZARDS ELECTRICAL HAZARDS e Unplug and or disconnect all electrical power to the unit before performing inspections maintenance or service e sure to follow proper lockout tag out procedures e Always work in the company of a qualified assistant if possible Capacitors even when disconnected from the electrical power source retain an electrical charge potential capable of causing electric shock or electrocution e Handle discharge and test capacitors according to safe established standards and approved procedures e Extreme care proper judgment and safety procedures must be exercised if it becomes necessary to test or troubleshoot equipment with the power on to the unit Do not spray or pour water on the return air grille discharge air grille evaporator coil control panel and sleeve on the room side of the air conditioning unit while cleaning Electrical component malfunction caused by water could result in electric shock or other electrically unsafe conditions when the power is restored and the unit is turned on even after the exterior is dry Never operate the A C unit with wet
42. the sealedsystem Piercing valve must be removed from the system before recharging 2 Recover Refrigerant in accordance with EPA regulations WARNING BURN HAZARD Proper safety procedures must be followed yt and proper protective clothing must be worn when working with a torch oh Reo Failure to follow these procedures could result in moderate or serious injury 3 Install a process tube to sealed system CAUTION FREEZE HAZARD Proper safety procedures must be followed and proper protective clothing must be worn when working with liquid refrigerant Failure to follow these procedures could result in minor to moderate injury 4 Make necessary repairs to system 5 Evacuate system to 200 microns or less 6 Weigh in refrigerant with the proper quantity of R 410A refrigerant 7 Start unit and verify performance WARNING BURN HAZARD Proper safety procedures must be followed and proper protective clothing must be worn when working with a torch Failure to follow these procedures could result in moderate or serious injury 8 Crimp the process tube and solder the end shut 15 16 WARNING ELECTRIC SHOCK HAZARD Turn off electric power before service or installation Extreme care must be used if it becomes necessary to work on equipment with power applied Failure to do so could result in serious injury or death Undercharged Re
43. ust be worn when working with refrigerants Failure to follow these procedures could result in serious injury or death The HazardGard unit is designed to operate at low outside ambient temperatures This is accomplished by the use of a bypass valve installed in the refrigeration circuit The valve is connected between the discharge line at the compressor and the suction process tube The valve responds to suction pressure which when reduced in the system causes the valve to open and bypass hot gas from the high pressure side to the low pressure side of the system The hot gas entering the compressor mixes with the cool gas returned through the suction line thus increasing the suction pressure The valve is preset to open when the suction pressure reaches 50 psig This pressure setting cannot be altered The system can be operated at outdoor temperatures as low as 45 F before the evaporator coil will begin to accumulate frost To determine if the valve operates block the return air to the evaporator coil Turn on the unit and touch the tube at the bypass valve outlet which connects to the suction process tube When the low side pressure reaches approximately 50 psig the valve will begin to open and the tube will get hot This method will determine if the valve is responding to the suction pressure change LOW AMBIENT BYPASS VALVE d 608 095 00 R 410A SEALED SYSTEM REPAIR CONSIDERATIONS WARNING Refrigeration system u
44. y or death 1 Recover all refrigerant and oil from the system 2 Remove compressor capillary tube and filter drier from the system 3 Flush evaporator condenser and all connecting tubing with dry nitrogen or equivalent Use approved flushing agent to remove all contamination from system Inspect suction and discharge line for carbon deposits Remove and clean if necessary Ensure all acid is neutralized 4 Reassemble the system including new drier strainer and capillary tube 5 Proceed with step 8 10 on previous section ROUTINE MAINTENANCE WARNING ELECTRIC SHOCK HAZARD Turn off electric power before inspections maintenances or service Extreme care must be used if it becomes necessary to work on equipment with power applied Failure to do so could result in serious injury or death EXCESSIVE WEIGHT HAZARD Use two people to lift or carry the unit and wear proper protective clothing Failure to do so may result in personal injury WARNING CUT SEVER HAZARD Be careful with the sharp edges and corners Wear protective clothing and gloves etc Failure to do so could result in serious injury NOTICE Units are to be inspected and serviced by qualified service personnel only Use proper protection on surrounding property Failure to follow this notice could result in moderate or serious property damage NOTICE Do not use a caustic coil cleaning agent on coils or base pan Use a biodegra
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