Installation Manual PDF
Contents
1. Use field supplied spreader bars when lifting the unit to minimize the possibility of lifting cable straps damage To protect the cabi net louvers use protective material such as plywood behind the cable straps Arrange the straps to form a central suspension point NOTE When raising and setting the unit observe all safety rules Remove shipping skid and all protection and lifting material after the unit is in place SAFE REFRIGERANT HANDLING While these items will not cover every conceivable situation they should serve as a useful guide A WARNING To avoid possible injury explosion or death practice safe handling of refrigerants A WARNING Refrigerants are heavier than air They can push out the oxygen in your lungs or in any enclosed space To avoid possible difficulty in breathing or death e Never purge refrigerant into an enclosed room or space By law all refrigerants must be reclaimed e Ifan indoor leak is suspected thoroughly ventilate the area before beginning work e Liquid refrigerant can be very cold To avoid possible frostbite or blindness avoid contact and wear gloves and goggles If liquid refrigerant does contact your skin or eyes seek medical help immediately e Always follow EPA regulations Never burn refrigerant as poisonous2. LEAK S PRESENT 3500 3000 2500 VACUUM IN MICRONS 2000 CONDENSIBLES OR SMALL LEAK PRESENT 1500 1000 NO LEAKS NO CONDENSIBLES 500 MINUTES Refer to the Remote Condensing Unit Service Manual for more detailed instructions on system evacuation preliminary charge adjustment and final charge adjustment ELECTRICAL CONNECTIONS A WARNING HIGH VOLTAGE Disconnect ALL power before servicing Multiple power sources may be present Failure to do so may cause property damage personal injury or death due to electric shock Wiring must conform with NEC or CEC and all local codes Undersized wires could cause poor equipment performance equipment damage or fire A WARNING To avoid the risk of fire or equipment damage use copper conductors NOTICE Units with reciprocating compressors and non bleed TXV s require a Hard Start Kit This unit is designed for three phase operation DO NOT OPERATE ON A SINGLE PHASE POWER SUPPLY M easure the power supply to the unit The supply voltage must be in agreement with the unit rating plate power requirements and within the range listed below RATED MINIMUM SUPPLY MAXIMUM SUPPLY VOLTAGE VOLTAGE VOLTAGE 208 230 260 The condensing unit rating plate lists pertinent electrical data nec essary for proper electrical service and overcurrent protection Wires should be sized to limit voltage drop to 2 max from the main b
3. AA CAUTION Use care when handling scroll compressors Dome temperatures could be hot Three phase scrolls are power phase dependent and can compress in more than one direction Verify proper rotation for three phase compressors by ensuring the suction pressure drops and discharge pressure rises when the compressor is energized NOTE When operated in reverse a three phase scroll compressors is noisier and its current draw substan tially reduced compared to marked values To correct disconnect power and switch any two leads at the unit contactor and re observe HIGH VOLTAGE CONNECTIONS Route power supply and ground wires through the high voltage port and terminate in accordance with the wiring diagram pro vided inside the control panel cover LOW VOLTAGE CONNECTIONS Condensing unit control wiring requires a five conductor low volt age circuit from the room thermostat without options The wires should be no smaller than 18 AWG and the field connection for this circuit must be made in the unit control box using solderless connectors i e wire nuts See the following diagram for a typical low voltage hook up SINGLE STAGE LOW VOLTAGE HOOK UP THERMOSTAT Y E CONDENSING AIR UNIT HANDLER P D GREEN ofianael A RED KED D erown WHITE B WHITE BLUE A D BLUE SYSTEM START UP Never operate the compressor with the suctio
4. ODN NDOT AN Daouat Mounting the evaporator coil above the condensing unit will require an inverted loop in the suction line adjacent or near the connection to the evaporator The top of the loop must be slightly higher than the top of the coil Mounting the condensing unit above the evaporator coil will not require an oil trap in the suction line at the evaporator except when the condensing unit is over 80 feet above the evaporator of a Insulation is necessary to prevent condensation from forming and dropping from the suction line Armflex or satisfactory equiva lent with 3 8 min wall thickness is recommended In severe conditions hot high humidity areas 1 2 insulation may be re quired Insulation must be installed in a manner which protects tubing from damage and contamination Where possible drain as much residual compressor oil from exist ing systems lines and traps pay close attention to low areas where oil may collect NOTE If changing refrigerant types ensure the indoor coil and metering device is compatible with the type of refrigerant being used otherwise the indoor coil must be rep
5. the reversing valve Note The thermometer is to be well insu lated to prevent ambient influences 3 Adjust the charge to maintain a clear sight glass 4 Allow the compressor to operate for about 10 additional min utes and measure the hot gas discharge temperature 5 Using an additional electronic thermometer measure the ambient 6 Adjust the charge until the hot gas temperature equals 105 F ambient or 5 F Remove charge to increase the tem perature NOTE When adjusting the charge allow the compressor to operate for about 10 minutes before taking readings NOTE Subsequent opening and replace of the cap will require only 1 2 to 1 hex flat See the table below for the torque required for an effective seal on the valve bonnet 1 6 turn past finger tight TORQUE After closing the valve bonnet perform a final refrigerant leak test on the valves and sweat connections Return the room thermo stat to the desired settings DEFROST CONTROL ADJUSTMENTS This heat pump uses a Time Temperature method for defrost A thermal sensor electrically set to Normally Open is wired to the electronic defrost control located in the control box The thermal sensor attached to the condenser coil determines the outdoor coil temperature Both coil temperature and compressor run time determine de frosting of the outdoor coil Adjustments to the defrost timing se lection can be changed from the 60 minute factory setting
6. DAIKIN CONDENSING UNIT HEAT PUMP INSTALLATION amp SERVICE REFERENCE IM PORTANT SAFETY INSTRUCTIONS The following symbols and labels are used throughout this manual to indicate immediate or potential safety hazards It isthe owner s and installer s responsibility to read and comply with all safety information and instructions accompanying these symbols Fail ure to heed safety information increases the risk of personal in jury property damage and or product damage A WARNING power sources may be present Failure to do so may HIGH VOLTAGE Disconnect ALL power before servicing Multiple wll cause property damage personal injury or death E WARNING ONLY individuals meeting the requirements at a minimum of an Entry Level Technician as specified by the Air Conditioning Heating and Refrigeration Institute AHRI may use this information Attempting to install or repair this unit without such background may result in product damage personal injury or death CAUTION Scroll equipped units should never be used to evacuate the air conditioning system Vacuums this low can cause internal electrical arcing resulting in a damaged or failed compressor SHIPPING INSPECTION Always keep the unit upright laying the unit on its side or top may cause equipment damage Shipping damage and subsequent in vestigation is the responsibility of the carrier Verify the model number specifications e
7. er the control or power circuit COMM ON CAUSES FOR UNSATISFACTORY OPERATION OF HEAT PUMPS IN HEATING MODE Dirty Filters Dirty filters or inadequate airflow through the indoor coil Failure to keep clean filters and adequate airflow 375 425 CFM ton will cause excessive discharge pressures that may cause the high pres sure switch to function Low Return Air Temperatures Return ductwork temperatures that are less than 60 F will cause low discharge pressure low suction pressure and excessive de frost cycling Solenoid does not energize when voltage is present No voltage to the solenoid The valve will not shift a Undercharged b Valve body damage c Valve sticking REM EDY 1 Purge or pump down excessive charge 2 Make certain that coil is not fouled in any way or that air isnot re circulating 3 Purge these gases from the system Recharge system if necessary 1 Charge system until sight glass is clear of bubbles 2 Replace compressor 1 Open the liquid line valve 2 Replace filter dryer 3 Detach the bulb from the suction line and hold in one hand If no liquid refrigerant goes through the valve replace the valve 4 Test the unit for leaks Add refrigerant until sight glass is free from bubbles after repairing leak 5 Clean or replace filter 6 Defrost and clean coil Clean or replace filters 7 Excessive liquid line drop Check liquid line sz 8 Increase the blower speed 1 Co
8. gas will be produced A WARNING To avoid possible explosion e Never apply flame or steam to a refrigerant cylinder If you must heat a cylinder for faster charging partially immerse it in warm water Never fill a cylinder more than 80 full of liquid refrigerant Never add anything other than R 410A to an R 410A cylinder The service equipment used must be listed or certified for the type of refrigerant used Store cylinders in a cool dry place Never use a cylinder as a platform or a roller A WARNING To avoid possible explosion use only returnable not disposable service cylinders when removing refrigerant from a system Ensure the cylinder is free of damage which could lead to a leak or explosion Ensure the hydrostatic test date does not exceed 5 years e Ensure the pressure rating meets or exceeds 400 Ibs When in doubt do not use cylinder REFRIGERANT LINES AA CAUTION The compressor POE oil for R 410A units is extremely susceptible to moisture absorption and could cause compressor failure Do not leave system open to atmosphere any longer than necessary for installation NOTE For improved refrigerant management equip the evaporator coil with a field supplied thermal expansion valve TXV and the liquid line with a field supplied liquid line solenoid Ensure the solenoid is installed as close as possible to the evaporator coil to prevent refrigeration migration in the compressor OFF cycle Use
9. ibility to follow the NEC USA or CEC Canada when sizing the service Local codes often require a disconnect switch located near the unit do not install the switch on the unit Refer to the installation instructions supplied with the indoor furnace air handler for spe cific wiring connections and indoor unit configuration Likewise consult the instructions packaged with the thermostat for mount ing and location information OVERCURRENT PROTECTION The following overcurrent protection devices are approved for use e Time delay fuses e HACR type circuit breakers These devices have sufficient time delay to permit the motor com pressor to start and accelerate its load Refer to the unit serial plate for the maximum overcurrent pro tection permitted Run all line voltage wiring a conduit from the service disconnect box to the unit Refer to the NEC USA or CEC Canada codes for the correct size conduit based on the wire size The conduit en ters the control box through the hole provided in the bottom NOTE The control box hole is sized for 3 4 conduit If permitted by code a flexible conduit is preferred to minimize vibration trans mission from the unit to the building Connect the line voltage wires to the L1 L2 and L3 terminals of the definite purpose contactor located in the unit control box Refer to the wiring diagram attached to the unit when making these connections THREE PHASE COM PRESSOR ROTATION
10. itable base The selected site should be no greater than 50 below or 70 above the evaporator section For optimum performance the minimum length interconnecting tubing is preferred When possible mini mize the amount of bends and turns ROOFTOP INSTALLATIONS If it is necessary to install this unit on a roof structure ensure the roof structure can support the weight and that proper consider ation is given to the weather tight integrity of the roof Since the unit can vibrate during operation sound vibration transmission should be considered when installing the unit Vibration absorb ing pads or springs can be installed between the condensing unit legs or frame and the roof mounting assembly to reduce noise vibration NOTE These units require special location consideration in areas of heavy snow accumulation and or areas with prolonged continuous subfreezing temperatures Heat pump unit bases have cutouts under the outdoor coil that permit drainage of frost accumulation Situate the unit to permit free unobstructed drainage of the defrost water and ice A minimum 3 clearance under the outdoor coil is required in the milder climates In more severe weather locations it is recommended that the unit be elevated to allow unobstructed drainage and air flow RIGGING AA WARNING To avoid possible injury or death all panels must be in position and secured before lifting this equipment
11. laced To facilitate oil return to the compressor a horizontal suction line should be pitched 1 2 per 10 toward the condensing unit Filter Drier and Sight Glass A liquid line filter drier is factory installed Field install the sup plied sight glass moisture indicator on the liquid line as close as practical to the service valve BURYING REFRIGERANT LINES If burying refrigerant lines can not be avoided use the following checklist 1 Insulate liquid and suction lines separately 2 Enclose all underground portions of the refrigerant lines in waterproof material conduit or pipe sealing the ends where tubing enters exits the enclosure 3 If the lines must pass under or through a concrete slab en sure lines are adequately protected and sealed REFRIGERANT LINE CONNECTIONS IMPORTANT To avoid overheating the service valve TXV valve or filter drier while brazing wrap the component with a wet rag or use a thermal heat trap compound as recommended by the compound manufacturer Use a brazing alloy of 2 mini mum silver content Do not use flux 1 The ends of the refrigerant lines must be cut square de burred cleaned and be round and free from nicks or dents Any other condition increases the chance of a refrigerant leak 2 This unit is factory shipped with a holding charge Sweep the refrigerant line with nitrogen or inert gas during brazing to prevent the formation of copper oxide inside the refrig e
12. lectrical characteristics and accessories are correct prior to installation The distributor or manufacturer will not accept claims from dealers for transportation damage or installation of incorrectly shipped units CODES amp REGULATIONS This product is designed and manufactured to comply with na tional codes Installation in accordance with such codes and or prevailing local codes regulations is the responsibility of the in staller The manufacturer assumes no responsibility for equip ment installed in violation of any codes or regulations Rated per formance is achieved after 72 hours of operation Rated perfor I1O0D 4004A 9 2013 Our continuing commitment to quality products may mean a change in specifications without notice 2013 DAIKIN MANUFACTURING COMPANY L P 5151 San Felipe St Suite 500 Houston TX 77056 www daikincomfort com INSTALLATION INSTRUCTIONS Pe do mance is delivered at the specified airflow See outdoor unit speci fication sheet for split system models or product specification sheet for packaged and light commercial models Specification sheets can be found at www daikincomfort com for Daikin brand prod ucts Within the website please select the residential or com mercial products menu and then select the submenu for the type of product to be installed such as air conditioners or heat pumps to access a list of product pages that each contain links to that model s specification sheet The United S
13. n DFT and C on the defrost board Should the defrost ther mostat fail to close after a heavy build up of frost and the thermostat is less than 28 the thermostat is to be replaced 7 After the thermostat has closed short across the test pins with the a screwdriver blade until the reversing valve shifts This could take up to 22 seconds depending upon the posi tion of the timing setting on the defrost board Immediately upon the action of the reversing valve remove the short Note If this short is not removed immediately the defrost activity will last only 3 seconds 8 After defrost has terminated up to 10 minutes check the defrost thermostat for 24V between DFT and C This reading should be OV open sensor 9 Shut off power to the unit A WARNING power sources may be present Failure to do so may HIGH VOLTAGE Disconnect ALL power before servicing Multiple sll cause property damage personal injury or death i 10 Replace outdoor fan motor wire removed in Step d NOTE The compressor run time is accumulative during multiple heating cycles The timer will reset to zero only when the defrost sensor returns to an open condition If the room thermostat is operating in the EM HT mode no accumulation of compressor time is recorded TROUBLESHOOTING Qualified Installer Servicer only When troubleshooting the first step should always be to check for clean coils clean filter s a
14. n the following section EXPANSION VALVE SYSTEM NOTE The expansion valve bulb must be in place on the suction line and insulated Expansion Valve Indoor Coils Outdoor Temperature Over 60 F When the outdoor tempera ture is above 60 F charge the system with the room thermostat set in the Cooling mode and the fan operating in the Auto position Outdoor Temperature Below 60 F When the outdoor tempera ture is below 60 F charge the system with the room thermostat set in the Heat mode and the fan operating in the Auto posi tion System Charging Cooling Mode At stabilized cooling conditions and with an outdoor temperature of 60 F or higher the system should have from 9 F to 13 F subcooling For a proper subcooling reading measure the refrigerant pressure and temperature at the outdoor unit s liquid line service valve If you have less than 9 F subcooling add charge If you have more than 13 F subcooling remove charge While reaching the proper subcooling level it isimportant to know the discharge line temperature This temperature should be at least 80 F over ambient or unit is flooding back to compressor System Charging Heating Mode M easure the hot gas discharge at the compressor to check the system charge in heat mode 1 Allow the system to operate for at least 20 minutes 2 Attach and insulate an electronic thermometer to the hot gas discharge line mid way between the compressor and
15. n valve closed to test the compressor s pumping efficiency In some cases this can result in serious compressor damage and loss of warranty cover age For the 7 1 2 ton unit starting charge should be 15 Ibs of R 410A and 18 Ibs for the 10 ton unit The length of line set indoor unit air flow condensing unit location and number of tubing fittings will have an impact on final unit charge amount Turn the electrical power on and let the system run Wait for the refrigerant pres sures to stabilize CHARGE VERIFICATION A WARNING REFRIGERANT UNDER PRESSURE Do not overcharge system with refrigerant e Do not operate unit in a vacuum or at negative pressure Failure to follow proper procedures may cause property damage personal injury or death AA CAUTION Use refrigerant certified to AHRI standards Used refrigerant may cause compressor damage Most portable machines cannot clean used refrigerant to meet AHRI standards NOTICE Violation of EPA regulations may result in fines or other penalties AA CAUTION Operating the compressor with the suction valve closed will void the warranty and cause serious compressor damage FINAL CHARGE ADJUSTMENT The outdoor temperature must be 60 F or higher Set the room thermostat to COOL fan switch to AUTO and set the tempera ture control well below room temperature After system has stabilized per startup instructions check sub cooling and superheat as detailed i
16. nd proper airflow Indoor airflow should be 375 to 425 CFM per ton of cooling based on the size of the outdoor unit The most common way of establishing indoor airflow is heating temperature rise Indoor airflow will then be Heating output of equipment 1 1 x temp rise In other cases measurement of external static pressure is helpful For details see the Installation Instructions for your indoor unit TROUBLE SHOOTING ANALYSIS TABLE COMPLAINT PROBABLE CAU SE 1 Excessive charge of refrigerant in system 2 Inadequate supply of air across the condenser coil 3 Non condensate gases in the system 1 High Head Pressure 1 System low on refrigerant 2 Compressor valves broken 1 Liquid line valve closed 2 Restricted liquid line 3 The bulb of the thermal expansion valve haslost its charge 2 Low Head Pressure 3 Low Suction Pressure 4 System low on refrigerant 5 Dirty filters 6 Coil frosted up 7 Flash gas in the liquid line 8 Quantity of air through evaporator not adequate 1 Expansion valve stuck open 2 Expansion valve bulb not in contact with 4 High Suction Pressure suction line 3 Suction and or discharge valve leaking or broken 1 Disconnect switch open 2 Blown fuse or fuse at disconnect switch 3 Thermostat set too high 4 Selector switch in Off postion 5 Contactor and or relay coils burned out 5 Compressor will not start 6 Loo or open electrical connection in eith
17. only refrigerant grade dehydrated and sealed copper tubing to connect the condensing unit with the indoor evaporator After cutting the tubing install plugs to keep refrigerant tubing clean and dry prior to and during installation Tubing should always be cut square keeping ends round and free from burrs Clean the tubing to prevent contamination Do NOT let refrigerant lines come in direct contact with plumbing ductwork floor joists wall studs floors and walls When running refrigerant lines through a foundation or wall openings should allow for sound and vibration absorbing material to be placed or installed between tubing and foundation Any gap between foun dation or wall and refrigerant lines should be filled with a pliable silicon based caulk RTV or a vibration damping material Avoid suspending refrigerant tubing from joists and studs with rigid wire or straps that would come in contact with the tubing Use an insu lated or suspension type hanger Keep both lines separate and always insulate the suction line REFRIGERANT LINE LENGTH C oa 254 50m Line Diameter In OD Cond Unit Tons Suct liq Suct lig Sut Liq Full rating line size Lines greater than 74 feet in length or vertical elevation changes more than 50 feet referto the Remote Cooling Service Manual or contact your distributor for assistance REFRIGERANT LINES Liquid Line 0 S Suction Line l aooo aoaaa DN T
18. rant lines 3 After brazing quench the joints with water or a wet cloth to prevent overheating of the service valve 4 Ensure the filter drier paint finish is intact after brazing If the paint of the steel filter drier has been burned or chipped repaint or treat with a rust preventative This is especially important on suction line filter driers which are continually wet when the unit is operating NOTE Be careful not to kink or dent refrigerant lines Kinked or dented lines will cause poor performance or compressor damage Do NOT make final refrigerant line connection until plugs are removed from refrigerant tubing NOTE Before brazing verify indoor piston size by checking the piston kit chart packaged with indoor unit LEAK TESTING NITROGEN OR NITROGEN TRACED AQAWARNING To avoid the risk of fire or explosion never use oxygen high pressure air or flammable gases for leak testing of a refrigeration system A WARNING To avoid possible explosion the line from the nitrogen cylinder must include a pressure regulator and a pressure relief valve The pressure relief valve must be set to open at no more than 150 psig Pressure test the system using dry nitrogen and soapy water to locate leaks If you wish to use a leak detector charge the system to 10 psi using the appropriate refrigerant then use nitrogen to finish charging the system to working pressure then apply the de tector to suspect areas If leaks are fo
19. reaker or fuse panel to the condensing unit Consult the NEC CEC and all local codes to determine the correct wire gauge and length The wire size must be sufficient to carry the Minimum Circuit Ampacity MCA listed on the serial plate The supply voltage can be unbalanced phase to phase within 2 The following formula can be used to determine the percent age of voltage unbalance for your unit Percentage Max Voltage Deviation From Voltage 100 x Average Voltage Unbalance Average Voltage Example L1 L2 220V L2 L3 216V Average Voltage 220 216 213 649 73 Maximum Deviation from Average 220 216 4 Voltage Unbalance 100 x 4 216 400 216 MAXIMUM ALLOWABLE LENGTH IN FEET TO LIMIT VOLTAGE DROP TO 2 Wire Size Minimum Circuit Ampacity MCA aiaa CAPITATE TEIA ua o RR a a S R o iss 125 o5 75 63 54 NRT NR e Mozio 86 75 68 6 ara 314 235 188 157 134 118 110 Based on NEC 1996 EXAMPLE The distance from the building to the unit is 75 Calculate the minimum wire size assuming no more than 2 voltage drop MCA for 7 1 2 ton 230V unit 43 3 from S amp R plate Applying previous table wire sizes less than 8 AWG cannot be used for circuits which have a rating of 45A The 8 wire is not suitable since the maximum length for a 45A circuit is 68 Solution Use a 6 AWG wire suitable up to 110 NOTE It is the contractors s respons
20. rrect valve action or replace the valve 2 Fasten bulb securely to suction line 3 Replace compressor 1 Close the disconnect switch 2 Check the cause of failure and replace the fuse 3 Adjust to lower temperature 4 Turn selector switch knob to Cool position 5 Replace contactor and or relay 6 Inspect and secure all electrical connections Underchargin An undercharged system will cause low discharge pressure low suction pressure and an accumulation of frost on the lower sec tion of the outdoor coil Poor Termination of Defrost The defrost sensor must make good contact with the outside coil return bend or a non termination of defrost may occur Reversing Valve A reversing valve may not function correctly for the following rea sons Replace the reversing valve Check the wiring Check for leaks Replace the reversing valve Replace the reversing valve
21. tates Environmental Protection Agency EPA has issued various regulations regarding the introduction and dis posal of refrigerants Failure to follow these regulations may harm the environment and can lead to the imposition of substantial fines Should you have any questions please contact the local of fice of the EPA If replacing a condensing unit or air handler the system must be manufacturer approved and Air Conditioning and Refrigeration Institute AHRI matched NOTE Installation of unmatched sys tems is strongly discouraged Outdoor units are approved for operation above 55 F in cooling mode Operation below 55 F in cooling mode requires the use of an approved low ambient kit Operating the unit in a structure that is not complete either as part of new construction or renovation will void the warranty Refer to the unit Specification Sheet for the recommended indoor model selection NOTE This unit must be used with a purchased single stage room thermostat with 24 VAC control circuitry INSTALLATION CLEARANCES This unit is designed for outdoor installations only Special consid eration must be given to location of the condensing unit s in re gard to structures obstructions other units and any all other fac tors that may interfere with air circulation Where possible the top of the unit should be completely unobstructed however if vertical conditions require placement beneath an obstruction there should be a minim
22. to ei ther 30 or 90 minutes by moving the jumper on the defrost con trol For the system to initiate a defrost the following statements must be true e The Defrost Sensor is closed and e The compressor run time is equal to the timing selection on the defrost board During defrost the following actions occur 1 The reversing valve is energized and the heat pump oper ates in the cooling mode 2 The airhandler auxiliary heat if equipped is activated 3 The condenser fan motor is shut off If the defrost cycle has not terminated after ten 10 minutes the control will override the defrost sensor and revert to a heating mode The defrost control has test pins which can be useful when trouble shooting in the heating mode These test pins accelerate the com pressor run time counter The suggested method for accessing this feature is 1 Run unit in heat mode 2 Check unit for proper charge NOTE Bands of frost indicate low refrigerant charge 3 Shut off power to unit A WARNING HIGH VOLTAGE Disconnect ALL power before servicing Multiple lh power sources may be present Failure to do so may cause property damage personal injury or death 4 Disconnect outdoor fan by removing the purple lead from the Condenser Fan Defrost Relay 5 Restart unit and allow frost to accumulate 6 After afew minutes the defrost thermostat should close To verify the position of the thermostat check for 24V betwee
23. um of 60 inches between the top of the unit and the obstruction s The specified dimensions meet require ments for air circulation only Consult all appropriate regulatory codes prior to determining final clearances Another important consideration in selecting a location for the unit s is the angle to obstructions Either side adjacent the valves can be placed toward the structure provided the side away from the structure maintains minimum service clearance Corner in stallations are strongly discouraged SUMMA oe ee a This unit can be located at ground floor level or on flat roofs At ground floor level the unit must be on a solid level foundation that will not shift or settle To reduce the possibility of sound trans mission the foundation slab should not be in contact with or be an integral part of the building foundation The foundation slab should be a minimum of 6 wider than the unit in all directions Ensure the foundation is sufficient to support the unit A concrete slab raised above ground level provides a su
24. und repair them After re pair repeat the pressure test If no leaks exist proceed to system evacuation SYSTEM EVACUATION Condensing unit liquid and suction valves are closed to contain the charge within the unit The unit is shipped with the valve stems closed and caps installed Do not open valves until the system is evacuated AA WARNING REFRIGERANT UNDER PRESSURE Failure to follow proper procedures may cause property damage personal injury or death 1 Connect the vacuum pump with 250 micron capability to the service valves 2 Evacuate the system to 250 microns or less using suction and liquid service valves Using both valves is necessary as some compressors create a mechanical seal separating the sides of the system 3 Close pump valve and hold vacuum for 10 minutes Typi cally pressure will rise during this period e If the pressure rises to 1000 microns or less and remains steady the system is considered leak free proceed to startup e If pressure rises above 1000 microns but holds steady below 2000 microns moisture and or noncondensibles may be present or the system may have a small leak Return to step 2 If the same result is encountered check for leaks as previ ously indicated and repair as necessary then repeat evacua tion e If pressure rises above 2000 microns a leak is present Check for leaks as previously indicated and repair as necessary then repeat evacuation 5000 4500 4000
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