Installation Instructions
Contents
1. 24ABB 24ABC Base Series Air Conditioners with Puron Refrigerant 1 1 2 To 5 Nominal Tons Installation SAFETY CONSIDERATIONS Improper installation adjustment alteration service maintenance or use can cause explosion fire electrical shock or other conditions which may cause death personal injury or property damage Consult a qualified installer service agency or your distributor or branch for information or assistance The qualified installer or agency must use factory authorized kits or accessories when modifying this product Refer to the individual instructions packaged with the kits or accessories when installing Follow all safety codes Wear safety glasses protective clothing and work gloves Use quenching cloth for brazing operations Have fire extinguisher available Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit Consult local building codes and current editions of the National Electrical Code NEC NFPA 70 In Canada refer to current editions of the Canadian electrical code CSA 22 1 Recognize safety information This is the safety alert symbol A When you see this symbol on the unit and in instructions or manuals be alert to the potential for personal injury Understand these signal words DANGER WARNING and CAUTION These words are used with the safety alert symbol DANGER identifies the most serious hazards which will result in2. The following procedure is valid when indoor airflow is within 21 percent of its rated CFM 1 Operate unit a minimum of 15 minutes before checking charge 2 Measure suction pressure by attaching an accurate gage to suction valve service port 3 Measure suction temperature by attaching an accurate ther mistor type or electronic thermometer to suction line at ser vice valve 4 Measure outdoor air dry bulb temperature with thermo meter 5 Measure indoor air entering indoor coil wet bulb temper ature with a sling psychrometer 6 Refer to Table 3 Superheat Charging AC Only Find outdoor temperature and evaporator entering air wet bulb temperature At this intersection note superheat Where a dash appears on the table do not attempt to charge sys tem under these conditions or refrigerant slugging may oc cur Charge must be weighted in adding or removing 0 6 oz ft of 3 8 liquid line above or below 15 feet 4 6m re spectively 7 Refer to Table 4 Required Suction Line Temperature Find superheat temperature from 6 above and suction pressure At this intersection note suction line temperature 8 If unit has a higher suction line temperature than charted temperature add refrigerant until charted temperature is reached 9 If unit has a lower suction line temperature than charted temperature reclaim refrigerant until charted temperature is reached 10 When adding refrigerant charge in liquid
3. Check Charge Factory charge amount and desired subcooling are shown on unit rating plate Charging method is shown on information plate inside unit To properly check or adjust charge conditions must be favorable for subcooling charging Favorable conditions exist when the outdoor temperature is between 70 F and 100 F 21 11 C and 37 78 C and the indoor temperature is between 70 F and 80 F 21 11 C and 26 67 C Follow the procedure below Unit is factory charged for 15ft 4 57 m of lineset Adjust charge by adding or removing 0 6 oz ft of 3 8 liquid line above or below 15ft 4 57 m respectively For standard refrigerant line lengths 80 ft 24 38 m or less allow system to operate in cooling mode at least 15 minutes If conditions are favorable check system charge by subcooling method If any adjustment is necessary adjust charge slowly and allow system to operate for 15 minutes to stabilize before declaring a properly charged system If the indoor temperature is above 80 F 26 67 C and the outdoor temperature is in the favorable range adjust system charge by weight based on line length and allow the indoor temperature to drop to 80 F 26 67 C before attempting to check system charge by subcooling method as described above If the indoor temperature is below 70 F 21 11 C or the outdoor temperature is not in the favorable range adjust charge for line set length above or below 15ft 4 57 m only Charge level shou
4. BRASS HEX NUT TEFLON SEAL TEFLON 3 4 BRASS HEX BODY RINGS a DISTRIBUTOR PISTON PISTON RETAINER A10342 Fig 5 Indoor Cooling Piston A CAUTION PRODUCT OPERATION HAZARD Failure to follow this caution may result in equipment damage or improper operation If using a TXV in conjunction with a single phase reciprocating compressor a compressor start capacitor and relay are required Units with Cooling Mode TXV Units installed with cooling mode TXV require charging by the subcooling method 1 Operate unit a minimum of 15 minutes before checking charge 2 Measure liquid service valve pressure by attaching an accur ate gage to service port 3 Measure liquid line temperature by attaching an accurate thermistor type or electronic thermometer to liquid line near outdoor coil 4 Refer to unit rating plate for required subcooling temperat ure 5 Refer to Table 2 Rating Plate required Subcooling Tem perature Find the point where required subcooling temper ature intersects measured liquid service valve pressure 6 To obtain required subcooling temperature at a specific li quid line pressure add refrigerant if liquid line temperature is higher than indicated or reclaim refrigerant if temperature is lower Allow a tolerance of 3 F 1 7 C Units with Indoor Piston Units installed with indoor pistons require charging by the superheat method
5. below permissible limits NOTE Use copper wire only between disconnect switch and unit NOTE Install branch circuit disconnect of adequate size per NEC to handle unit starting current Locate disconnect within sight from and readily accessible from unit per Section 440 14 of NEC Route Ground and Power Wires Remove access panel to gain access to unit wiring Extend wires from disconnect through power wiring hole provided and into unit control box A WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death The unit cabinet must have an uninterrupted or unbroken ground to minimize personal injury if an electrical fault should occur The ground may consist of electrical wire or metal conduit when installed in accordance with existing electrical codes Connect Ground and Power Wires Connect ground wire to ground connection in control box for safety Connect power wiring to contactor as shown in Fig 5 DISCONNECT PER N E C AND OR LOCAL CODES CONTACTOR O o a eae ecnnene O 0 BLUE POASE ONIY ae S FIELD GROUND WIRING GROUND LUG A94025 Fig 6 Line Connections Connect Control Wiring Route 24 v control wires through control wiring grommet and connect leads to control wiring See Fig 7 Refer to Installation Instructions packaged with thermostat Use No 18 AWG color coded insulated 35 C minimum wire
6. between 70 F and 80 F 21 C and 27 C 24ABB 24ABC SUPERHEAT TEMP F Table 4 Required Suction Line Temperature SUCTION PRESSURE AT SERVICE PORT PSIG 107 8 112 2 116 8 121 2 126 130 8 138 8 140 8 145 8 0 35 37 39 41 43 45 47 49 51 2 37 39 41 43 45 47 49 51 53 4 39 41 43 45 47 49 51 53 55 6 41 43 45 47 49 51 53 55 57 8 43 45 47 49 51 53 55 57 59 10 45 47 49 51 53 55 57 59 61 12 47 49 51 53 55 57 59 61 63 14 49 51 53 55 57 59 61 63 65 16 51 53 55 57 59 61 63 65 67 18 53 55 57 59 61 63 65 67 69 20 55 57 59 61 63 65 67 69 71 22 57 59 61 63 65 67 69 71 73 24 59 61 63 65 67 69 71 73 75 26 61 63 65 67 69 71 73 75 77 28 63 65 67 69 71 73 75 77 79 30 65 67 69 71 73 75 77 79 81 32 67 69 71 73 75 77 79 81 83 34 69 71 73 75 77 79 81 83 85 36 71 73 75 77 79 81 83 85 87 38 73 75 77 79 81 83 85 87 89 40 75 77 79 81 83 85 87 89 91 Make Electrical Connections Be sure field wiring complies with local and national fire safety and electrical codes and voltage to system is within limits shown on unit rating plate Contact local power company for correction of improper voltage See unit rating plate for recommended circuit protection device NOTE Operation of unit on improper line voltage constitutes abuse and could affect unit reliability See unit rating plate Do not install unit in system where voltage may fluctuate above or
7. severe personal injury or death WARNING signifies hazards which could result in personal injury or death CAUTION is used to identify unsafe practices which would result in minor personal injury or product and property damage NOTE is used to highlight suggestions which will result in enhanced installation reliability or operation A WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death Before installing modifying or servicing system main electrical disconnect switch must be in the OFF position There may be more than 1 disconnect switch Lock out and tag switch with a suitable warning label A CAUTION CUT HAZARD Failure to follow this caution may result in personal injury Sheet metal parts may have sharp edges or burrs Use care and wear appropriate protective clothing and gloves when handling parts turn to the experts fF Instructions GENERAL NOTE In some cases noise in the living area has been traced to gas pulsations from improper installation of equipment 1 Locate unit away from windows patios decks etc where unit operation sound may disturb customer 2 Ensure that vapor and liquid tube diameters are appropriate for unit capacity 3 Run refrigerant tubes as directly as possible by avoiding un necessary turns and bends 4 Leave some slack between structure and unit to absorb vi bration 5 When passing refrigerant tubes through the wa
8. 406 112 44 110 43 108 42 106 41 104 40 102 39 416 114 46 112 44 110 43 108 42 106 41 104 40 427 116 47 114 46 112 44 110 43 108 42 106 41 439 118 48 116 47 114 46 112 44 110 43 108 42 450 120 49 118 48 116 47 114 46 112 44 110 43 462 122 50 120 49 118 48 116 47 114 46 112 44 474 124 51 122 50 120 49 118 48 116 47 114 46 Table 3 Superheat Charging AC Only EVAPORATOR ENTERING AIR TEMPERATURE F WB OUTDOOR TEMP F 50 52 54 56 58 60 62 64 67 68 70 72 74 76 55 9 12 14 17 20 23 26 29 32 35 37 40 42 45 60 7 10 12 15 18 21 24 27 30 33 35 38 40 43 65 6 10 13 16 19 21 24 27 30 33 36 38 41 70 7 10 13 16 19 21 24 27 30 33 36 39 75 6 9 12 15 18 21 24 28 31 34 37 80 5 8 12 15 18 21 25 28 31 35 85 8 11 15 19 22 26 30 33 90 5 9 13 16 20 24 27 31 95 6 10 14 18 22 25 29 100 8 12 15 20 23 27 105 5 9 13 17 22 26 110 6 11 15 20 25 115 8 14 18 23 Optimum performance point 95 F 35 C outdoor ambient and 80 F 27 C dry bulb 67 F 19 C wet bulb indoor conditions DOE A Test Conditions Where a dash appears do not attempt to charge system under these conditions or refrigerant slugging may occur Charge must be weighed in Note Superheat F is at low side service port Allow a tolerance of 3 F 1 7 C Note Indoor dry bulb
9. If thermostat is located more than 100 ft 30 48 m from unit as measured along the control voltage wires use No 16 AWG color coded wire to avoid excessive voltage drop All wiring must be NEC Class 1 and must be separated from incoming power leads Use furnace transformer fan coil transformer or accessory transformer for control power 24v 40va minimum NOTE Use of available 24v accessories may exceed the minimum 40va power requirement Determine total transformer loading and increase the transformer capacity or split the load with an accessory transformer as required Final Wiring Check IMPORTANT Check factory wiring and field wire connections to ensure terminations are secured properly Check wire routing to ensure wires are not in contact with tubing sheet metal etc Compressor Crankcase Heater When equipped with a crankcase heater furnish power to heater a minimum of 24 hr before starting unit To furnish power to heater only set thermostat to OFF and close electrical disconnect to outdoor unit A crankcase heater is required if refrigerant tubing is longer than 80 ft 24 38 m Refer to the Residential Piping and Longline Guideline and Service Manual Longline Section Residential Split System Air Conditioners and Heat Pumps Install Electrical Accessories Refer to the individual instructions packaged with kits or accessories when installing Start Up A CAUTION UNIT OPERATION AND SAFETY HAZARD Failure to f
10. ate to 500 microns prior to recharging e Do not vent Puron refrigerant into the atmosphere e Do not use capillary tube coils e Observe all warnings cautions and bold text e All indoor coils must be installed with a hard shutoff Puron TXV metering device Copyright 2010 Carrier Corp 7310 W Morris St e Indianapolis IN 46231 Printed in U S A Edition Date 07 10 Catalog No 24ABB C 6SI Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations Replaces 24ABB C 5SI 10
11. brazing Use refrigeration grade tubing Service valves are closed from factory and ready for brazing After wrapping service valve with a wet cloth braze sweat connections using industry accepted methods and materials Consult local code requirements Refrigerant tubing and indoor coil are now ready for leak testing This check should include all field and factory joints Table 1 Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters In 24ABB3 LIQUID RATED VAPOR UNIT SIZE 00086000 Connection Tube Diameter Diameter Diameter 18 24 3 8 3 4 3 4 30 3 8 3 4 3 4 36 3 8 7 8 7 8 42 48 3 8 7 8 7 8 60 3 8 7 8 1 1 8 24ABC6 LIQUID RATED VAPOR UNIT SIZE est Connection Tube Diameter Diameter Diameter 18 24 3 8 3 4 3 4 30 3 8 3 4 3 4 36 3 8 7 8 7 8 42 48 49 3 8 7 8 7 8 60 61 3 8 7 8 1 1 8 Units are rated with 25 ft 7 6 m of lineset See Product Data sheet for performance data when using different size and length linesets Notes 1 Do not apply capillary tube or fixed orifice indoor coils to these units 2 For Tubing Set lengths between 80 and 200 ft 24 38 and 60 96 m horizontal or 35 ft 10 7 m vertical differential 250 ft 76 2 m Total Equivalent Length refer to the Residential Piping and Longline Guide line Air Conditioners and Heat Pumps using Puron refrigerant 3 For alternate liquid line options on 18 42 size unit
12. essure rating must be 400 psig DOT 4BA400 or DOT BW400 e Puron refrigerant systems should be charged with liquid refrigerant Use a commercial type metering device in the manifold hose when charging into suction line with compressor operating e Manifold sets should be 700 psig high side and 180 psig low side with 550 psig low side retard e Use hoses with 700 psig service pressure rating e Leak detectors should be designed to detect HFC refrigerant e Puron refrigerant as with other HFCs is only compatible with POE oils e Vacuum pumps will not remove moisture from oil e Do not use liquid line filter driers with rated working pressures less than 600 psig e Do not leave Puron suction line filter driers in line longer than 72 hours Do not install a suction line filter drier in liquid line POE oils absorb moisture rapidly Do not expose oil to atmosphere e POE oils may cause damage to certain plastics and roofing materials e Wrap all filter driers and service valves with wet cloth when brazing e A factory approved liquid line filter drier is required on every unit e Do NOT use an R 22 TXV e If indoor unit is equipped with an R 22 TXV or piston metering device it must be changed to a hard shutoff Puron TXV 24ABB 24ABC e Never open system to atmosphere while it is under a vacuum e When system must be opened for service recover refrigerant evacuate then break vacuum with dry nitrogen and replace filter driers Evacu
13. form into suction service port using a flow restricting device 11 If outdoor air temperature or pressure at suction valve changes charge to new suction line temperature indicated on chart 12 Optimum performance will be achieved when the operating charge produces 10 F suction superheat at suction service valve with 95 F 35 C outdoor ambient and 80 F 27 C dry bulb 67 F 19 C wet bulb indoor temperature DOE A test conditions at rated airflow Table 2 Rating Plate required Subcooling Temperatures Measure R 410A Required Liquid Line Temperature F C Liquid Pressure F C F C F C F C F C F C psig 6 3 8 4 10 6 12 7 14 8 16 9 251 78 26 76 24 74 23 72 22 70 21 68 20 259 80 27 78 26 76 24 74 23 72 22 70 21 266 82 28 80 27 78 26 76 24 74 23 72 22 274 84 29 82 28 80 27 78 26 76 24 74 23 283 86 30 84 29 82 28 80 27 78 26 76 24 291 88 31 86 30 84 29 82 28 80 27 78 26 299 90 32 88 31 86 30 84 29 82 28 80 27 308 92 33 90 32 88 31 86 30 84 29 82 28 317 94 34 92 33 90 32 88 31 86 30 84 29 326 96 36 94 34 92 33 90 32 88 31 86 30 335 98 37 96 36 94 34 92 33 90 32 88 31 6 345 100 38 98 37 96 36 94 34 92 33 90 32 m 364 104 40 102 39 100 38 98 37 96 36 94 34 A 374 106 41 104 40 102 39 100 38 98 37 96 36 ra 384 108 42 106 41 104 40 102 39 100 38 98 37 2 395 110 43 108 42 106 41 104 40 102 39 100 38 gq
14. ing leads on unit contactor a CONTACTOR 24466 COM r r pe X O O oO x O 8 M v OFF NO 24VAC ON OK FLASH PHASE PROBLEM vs Y 11 LL 00010 Fig 7 3 Phase Monitor Control Applies to 3 Phase Units Only Table 5 Three Phase Monitor LED Indicators LED STATUS OFF No call for compressor operation FLASHING Reversed phase ON Normal A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation Ensure compressor rotation is correct e 3 phase scroll compressors are rotation sensitive e A flash LED on phase monitor indicates reverse rotation See Table 3 This will not allow contractor to be energized Disconnect power to unit and interchange 2 field wiring leads on unit contactor Sequence of Operation Turn on power to indoor and outdoor units Transformer is energized On a call for cooling thermostat makes circuits R Y and R G Circuit R Y energizes contactor starting outdoor fan motor and compressor circuit R G energizes indoor unit blower relay starting indoor blower motor on high speed When thermostat is satisfied its contacts open de energizing contactor and blower relay Compressor and motors stop If indoor unit is equipped with a time delay relay circuit the indoor blower will run an additional 90 seconds to increase system efficiency
15. is the most positive way of assuring a system is free of air and liquid water A tight dry system will hold a vacuum of 1000 microns after approximately 7 minutes See Fig 4 5000 4500 4000 2500 Q 2000 1500 1000 500 LEAK IN SYSTEM VACUUM TIGHT TOO WET TIGHT DRY SYSTEM 0 1 2 3 4 5 6 7 MINUTES A95424 Fig 4 Deep Vacuum Graph Final Tubing Check IMPORTANT Check to be certain factory tubing on both indoor and outdoor unit has not shifted during shipment Ensure tubes are not rubbing against each other or any sheet metal or wires Pay close attention to feeder tubes making sure wire ties on feeder tubes are secure and tight 24ABB 24ABC Installing with Indoor Piston Outdoor Unit Connected to Factory Approved Indoor Unit Check piston size shipped with indoor unit to see if it matches required indoor piston size If it does not match replace indoor piston with correct piston size NOTE Correct pistons are shipped with outdoor units in the accessory bag and are only qualified for piston fan coils Example fan coils with piston FB4C and FYS5B 1 5 through 4 ton When changing indoor piston use a back up wrench Hand tighten hex nut then tighten with wrench 1 2 turn Do not exceed 30 ft Ibs The indoor piston contains a Teflon ring or seal which is used to seat against the inside of distributor body and must be installed properly to ensure proper seating See Fig 13 16
16. ld then be appropriate for the system to achieve rated capacity The charge level could then be checked at another time when the both indoor and outdoor temperatures are in a more favorable range NOTE If line length is beyond 80 ft 24 38 m or greater than 20 ft 6 10 m vertical separation See Long Line Guideline for special charging requirements Final Checks IMPORTANT Before leaving job be sure to do the following 1 Ensure that all wiring is routed away from tubing and sheet metal edges to prevent rub through or wire pinching 2 Ensure that all wiring and tubing is secure in unit before adding panels and covers Securely fasten all panels and covers 3 Tighten service valve stem caps to 1 12 turn past finger tight 4 Leave Owner s Manual with owner Explain system opera tion and periodic maintenance requirements outlined in manual 5 Fill out Dealer Installation Checklist and place in customer file CARE AND MAINTENANCE For continuing high performance and to minimize possible equipment failure periodic maintenance must be performed on this equipment Frequency of maintenance may vary depending upon geographic areas such as coastal applications See Owner s Manual for information Table 6 Accessory Usage REQUIRED FOR ACCESSORY PE COOLING APPLICATIONS REQUIRED FOR LONG LINE SEA COAST Below 55 F 12 8 C Within 2 miles 3 22 km Ball Bearing Fan Motor Yest No N
17. ll seal open ing with RTV or other pliable silicon based caulk See Fig 1 6 Avoid direct tubing contact with water pipes duct work floor joists wall studs floors and walls 7 Do not suspend refrigerant tubing from joists and studs with a rigid wire or strap which comes in direct contact with tubing See Fig 1 8 Ensure that tubing insulation is pliable and completely sur rounds vapor tube 9 When necessary use hanger straps which are 1 in 25 4 mm wide and conform to shape of tubing insulation See Fig 1 10 Isolate hanger straps from insulation by using metal sleeves bent to conform to shape of insulation NOTE Avoid contact between tubing and structure OUTDOOR WALL NDOOR WALL A Us Wa CAU N LIQUID TUBE N Lu TUBE INSULATION THROUGH THE WALL a OST HANGER STRAP ARON BE ONY INSULATION VAPOR TUBE O 3 T O O amp CO LIQUID TUBE SUSPENSION _ 1 25 4 mm MIN A94026 Fig 1 Piping Installation 24ABB 24ABC The outdoor unit contains system refrigerant charge for operation with AHRI rated indoor unit when connected by 15 ft 4 57 m of field supplied or factory accessory tubing For proper unit operation check refrigerant charge using charging information located on control box cover and or in the Check Charge section of this instruction IMPORTANT Maximum liquid line size is 3 8 in OD for all residential applications incl
18. o Compressor Start Assist Capacitor and Relay Yes Yes No Crankcase Heater Yes Yes No Evaporator Freeze Thermostat Yes No No Hard Shut Off TXV Yes Yes Yes Liquid Line Solenoid Valve No No No Motor Master or Low ambient Pressure Switch Yes No No Support Feet Recommended No Recommended Winter Start Control Yes No No For tubing line sets between 80 and 200 ft 24 38 and 60 96 m and or 35 ft 10 7 m vertical differential refer to Residential Piping and Longline Guideline t Additional requirement for Low Ambient Controller full modulation feature MotorMaster Control Always Ask For AIR STORY D PART Typical THERMOSTAT FURNACE CONDITIONER 24 VAC HOT 24 VAC COM HEAT STAGE 1 COOL STAGE 1 INDOOR FAN LEGEND 24 V FACTORY WIRING 24 V FIELD WIRING A C THERMOSTAT 24 VAC HOT 24 VAC COM HEAT STAGE 1 COOL STAGE 1 INDOOR FAN FIELD SPLICE CONNECTION CONTACTOR A97368 Fig 8 Generic Wiring Diagrams See Thermostat Installation Instruction for specific unit combinations Typical AIR FAN COIL CONDITIONER A02326 24ABB 24ABC PURON R 410A REFRIGERANT QUICK REFERENCE GUIDE e Puron refrigerant operates at 50 70 percent higher pressures than R 22 Be sure that servicing equipment and replacement components are designed to operate with Puron refrigerant e Puron refrigerant cylinders are rose colored e Recovery cylinder service pr
19. ollow this caution may result in personal injury equipment damage or improper operation e Do not overcharge system with refrigerant e Do not operate unit in a vacuum or at negative pressure e Compressor dome temperatures may be hot A CAUTION PERSONAL INJURY HAZARD Failure to follow this caution may result in personal injury Wear safety glasses protective clothing and gloves when handling refrigerant and observe the following e Front seating service valves are equipped with Schrader valves Follow these steps to properly start up system 1 After system is evacuated fully open liquid and vapor ser vice valves 2 Unit is shipped with valve stem s front seated closed and caps installed Replace stem caps after system is opened to refrigerant flow Replace caps finger tight and tighten with wrench an additional 1 12 turn 3 Close electrical disconnects to energize system 4 Set room thermostat at desired temperature Be sure set point is below indoor ambient temperature 5 Set room thermostat to COOL and fan control to ON or AUTO mode as desired Operate unit for 15 minutes Check system refrigerant charge 24ABB 24ABC 24ABB 24ABC 3 Phase Monitor In 3 phase units a small circuit board is factory installed to monitor line voltage A small led will flash if a phase problem exists See code descriptions on monitor If LED is flashing disconnect power to unit and interchange 2 field wir
20. s Roof mounted units exposed to winds may require wind baffles Consult the Application Guideline and Service Manual Residential Split System Air Conditioners and Heat Pumps for wind baffle construction NOTE Unit must be level to within 2 3 8 in ft 9 5 mm m per compressor manufacturer specifications Clearance Requirements When installing allow sufficient space for airflow clearance wiring refrigerant piping and service Allow 24 in 609 6 mm clearance to service end of unit and 48 in 1219 2 mm above unit For proper airflow a 6 in 152 4 mm clearance on 1 side of unit and 12 in 304 8 mm on all remaining sides must be maintained Maintain a distance of 24 in 609 6 mm between units or 18 in 457 2 mm if no overhang within 12 ft 3 66 m Position so water snow or ice from roof or eaves cannot fall directly on unit NOTE 18 457 2 mm clearance option described above is approved for outdoor units with wire grille coil guard only Units with louver panels require 24 609 6 mm between units On rooftop applications locate unit at least 6 in 152 4 mm above roof surface Operating Ambient The minimum outdoor operating ambient in cooling mode without accessory is 55 F 12 78 C and the maximum outdoor operating ambient in cooling mode is 125 F 51 67 C Make Piping Connections amp WARNING PERSONAL INJURY AND ENVIRONMENTAL HAZARD Failure to follow this warning could re
21. s see Product Data or Residential Piping and Application Guideline Install Liquid Line Filter Drier Indoor A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation 1 Installation of filter drier in liquid line is required 2 Filter drier must be wrapped in a heat sinking material such as a wet cloth while brazing Refer to Fig 3 and install filter drier as follows 1 Braze 5 in liquid tube to the indoor coil 2 Wrap filter drier with damp cloth 3 Braze filter drier to above 5 in 127 mm liquid tube Flow arrow must point towards indoor coil 4 Connect and braze liquid refrigerant tube to the filter drier A05178 Fig 3 Liquid Line Filter Drier Evacuate Refrigerant Tubing and Indoor Coil A CAUTION UNIT DAMAGE HAZARD 24ABB 24ABC Failure to follow this caution may result in equipment damage or improper operation Never use the system compressor as a vacuum pump Refrigerant tubes and indoor coil should be evacuated using the recommended deep vacuum method of 500 microns The alternate triple evacuation method may be used see triple evacuation procedure in service manual Always break a vacuum with dry nitrogen Deep Vacuum Method The deep vacuum method requires a vacuum pump capable of pulling a vacuum of 500 microns and a vacuum gage capable of accurately measuring this vacuum depth The deep vacuum method
22. sult in personal injury or death Relieve pressure and recover all refrigerant before system repair or final unit disposal Use all service ports and open all flow control devices including solenoid valves Federal regulations require that you do not vent refrigerant to the atmosphere Recover during system repair or final unit disposal A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation If ANY refrigerant tubing is buried provide a 6 in 152 4 mm vertical rise at service valve Refrigerant tubing lengths up to 36 in 914 4 mm may be buried without further special consideration Do not bury lines more than 3 8 in 9 53 mm Dia Tiedown Knockouts in Basepan 2 Places i i hae as 9 lS I o NS ai Dg Me View From Top UNIT BASE PAN TIEDOWN KNOCKOUT LOCATIONS in mm Dimension in mm A B C 7606 9 X 696 9 7713 16 198 4 4 7 16 112 7 18 1 16 458 8 660 4 X 660 4 9 1 8 231 8 4 7 16 112 7 21 14 539 8 78001 X 8004 9 1 8 231 8 6 9 16 166 7 24 11 16 627 1 889 x 389 9 1 8 231 8 6 9 16 166 7 28 7 16 722 3 A05177 Fig 2 Tiedown Knockout Locations Outdoor units may be connected to indoor section using accessory tubing package or field
23. supplied refrigerant grade tubing of correct size and condition Rated tubing diameters shown in Table 1 are recommended up to 80 ft 24 38 m See Product Data for acceptable alternate vapor diameters and associated capacity losses For tubing requirements beyond 80 ft 24 38 m substantial capacity and performance losses can occur Following the recommendations in the Longline Guideline will reduce these losses Refer to Table 1 for field tubing diameters Refer to Table 5 for accessory requirements There are no buried line applications greater than 36 in 914 4 mm allowed If refrigerant tubes or indoor coil are exposed to atmosphere they must be evacuated to 500 microns to eliminate contamination and moisture in the system Outdoor Unit Connected to Factory Approved Indoor Unit Outdoor unit contains correct system refrigerant charge for operation with factory approved AHRI rated indoor unit when connected by 15 ft 4 57 m of field supplied or factory accessory tubing and factory supplied filter drier Check refrigerant charge for maximum efficiency Refrigerant Tubing Connection Outdoor Connect vapor and liquid tubes to fittings on vapor and liquid service valves see Table 1 Use refrigerant grade tubing Sweat Connection A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation Service valves must be wrapped in a heat sinking material such as a wet cloth while
24. uding long line Refer to Residential Piping and Longline Guideline for further information IMPORTANT Always install the factory supplied liquid line filter drier If replacing the filter drier refer to Product Data Digest for appropriate part number Obtain replacement filter driers from your distributor or branch INSTALLATION Check Equipment and Job Site UNPACK UNIT Move to final location Remove carton taking care not to damage unit Inspect Equipment File claim with shipping company prior to installation if shipment is damaged or incomplete Locate unit rating plate on unit corner panel It contains information needed to properly install unit Check rating plate to be sure unit matches job specifications Install on a Solid Level Mounting Pad If conditions or local codes require the unit be attached to pad tie down bolts should be used and fastened through knockouts provided in unit base pan Refer to unit mounting pattern in Fig 2 to determine base pan size and knockout hole location For hurricane tie downs contact local distributor for details and PE Professional Engineer certification if required by local authorities On rooftop applications mount on level platform or frame Place unit above a load bearing wall and isolate unit and tubing set from structure Arrange supporting members to adequately support unit and minimize transmission of vibration to building Consult local codes governing rooftop application
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