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1. GENERAL 10ACC UNIT CONTROL BOX A DAN G ER RECIPROCATING COMPRESSOR PF DANGER U DUAL CAPACITOR START Make sure all power is disconnected before CAPACITOR C7 i c12 beginning electrical service procedures option only 10ACC condensing units are available in 1 1 2 2 2 1 2 3 3 COMPRESSOR 1 2 4 and 5 ton capacities SE All major components indoor blower and coil must be ey Pier matched according to Lennox recommendations for the com f option only pressor to be covered under warranty Refer to the Engineer GROUNDING ing Handbook for approved system matchups A misapplied LUG system will cause erratic operation and can result in early com pressor failure ll UNIT COMPONENTS Unit components are illustrated in figure 1 FIGURE 2 10ACC UNIT COMPONENTS OUTDOOR FAN MOTOR CONTROL BOX 10ACC UNIT CONTROL BOX Scroll Compressor DUAL CAPACITOR C12 DISCHARGE LINE COMPRESSOR CONTACTOR K1 SUCTION LINE SERVICE VALVE GROUNDING At LUG COMPRESSOR N LIQUID LINE SERVICE VALVE SUCTION LINE FIGURE 1 FIGURE 3 Page 3 A Control Box Figures 2 amp 3 Electrical openings are provided under the control box cov er Field thermostat wiring is made to color coded pigtail connections 1 Compressor2. LENNOX wrrwromaron 10ACC EET ELSI EE Ee EP Service Literature Revised 08 2004 10ACC SERIES UNITS The 10ACC is a residential split system condensing unit available in sizes ranging from 1 1 2 to 5 tons Condens ing coil size circuiting and air volume result in a mini mum SEER rating of 10 0 The series is designed for use with an expansion valve or RFCIV system in the indoor unit 10ACC units are equipped with either a reciprocating com pressor or scroll compressor All compressors are hermetical ly sealed for long service life The compressor is installed in the unit on resilient rubber mounts to assure quiet vibration free operation A built in protection device assures protection from excessive current and temperatures The scroll operates like a standard compressor but it is unique in the way it compresses refrigerant This manual is divided into sections which discuss the major components refrigerant system charging proce dure maintenance and operation sequence All specifications in this manual are subject to change AWARNING Electric shock hazard Can cause injury or death Before attempting to perform A IMPORTANT Improper installation adjustment alteration service or maintenance can cause property damage person al injury or loss of life Installation and service must be performed by a qualified installer or service any service or maintenance turn the electrical power to unit OFF at discon
3. ro ve ee o rel er is os fe e9 ver e e 1 73 sea 20 73 on 7 ae 7 par an r ve re ros 71 aoe mo roo 7 as 78 Pro ae re wo ome 5 os 71 om 7 28 77 macl osese sr 77 Jaz 77 20 oo er rs are ro aoe e ss re ao m om 77 ass 79 os woo 272 e2 zr eo am fs re sf ot so wx ae wx oo re as 72 om 70 43 256 3s oor or om amp 7 oe or ws ow so 7 or wo sro w ses 06 e soe os arr se 72 555 o 0 om soe oe oer es we oe escea pee os peo ele es re Mm fe ole e m ro ve 75 23 60 7o ie 72 ee ra ves 7 mw 77 foe re er te amr 7 o 72 aor 7 sesa 72 fa 75 a 75 Pre aa re wo oe 75 oe m4 om 75 8 77 tev 28650 237 79 20 77 2 77 260 73 arr a0 264 e1 258 77 269 75 251 76 270 70 os eoe 256 75 Njera 72 a5 78 ro o a 76 ffas 0 feor 79 Pr ef ot we or 9 oor 6 an 77 oe 72 ra ox or ox oo oo os 77 ove 78 om L115 45 302 zz an e1 s21 81_ 338 75 357 83 339 s4 320 81 34 78 328 79 351 81 These are typical pressures only Indoor evaporator match up indoor air quality and evaporator load will cause the pressures to vary 1Tecumseh compressor 2Copeland compressor A IMPORTANT Use table 5 to perform maintenance checks Table 5 is not a procedure for ch
4. CROSS SECTION OF SCROLLS DISCHARGE STATIONARY SCROLL N DISCHARGE PRESSURE SSS A 4 4 4 a 4 3 4 SS N N N FERETTI Fa ATT oe A h FA Nw NW N AR LA TIPS SEALED BY DISCHARGE PRESSURE The counterclockwise orbiting scroll draws gas into the out er crescent shaped gas pocket created by the two scrolls figure 7 1 The centrifugal action of the orbiting scroll seals off the flanks of the scrolls figure 7 2 As the orbiting motion continues the gas is forced toward the center of the scroll and the gas pocket becomes compressed figure 7 3 When the compressed gas reaches the center it is dis charged vertically into a chamber and discharge port in the top of the compressor figure 6 The discharge pressure forcing down on the top scroll helps seal off the upper and lower edges tips of the scrolls figure 6 During a single orbit several pockets of gas are compressed simultaneous ly providing smooth continuous compression The scroll compressor is tolerant to the effects of liquid re turn If liquid enters the scrolls the orbiting scroll is allowed to separate from the stationary scroll The liquid is worked toward the center of the scroll and is discharged If the compressor is replaced conventional Lennox cleanup practices must be used Due to its efficiency the scroll compressor is capable of drawing a much deeper vacuum than reciprocating com pressors Deep vacuum opera
5. nect switch es Unit may have multiple power supplies TABLE OF CONTENTS agency Electrical Data and Specifications 2 een dite yout etn ewtd inetd oaledad Grids 3 A IMPORTANT Il Unit Components 02002022 eee 3 The Clean Air Act of 1990 bans the intentional vent III Refrigerant System is Errai cos LEN tay a AP an sth ob oh E cok A aS 6 ing of CFC s and HFC s as of July 1 1992 Approved WV Ch rging arate sida ikl hn ch ie e Rea ee A 8 methods of recovery recycling or reclaiming must be followed Fines and or incarceration my be levied V Maintenance 2 2 0000 eee eee eee 11 for noncompliance VI Wiring Diagram 0200 002 e eee 12 A WARNING Refrigerant can be harmful if it is inhaled Refrigerant must be used and recovered responsibly Failure to follow this warning may result in person al injury or death Teennical Page 1 2002 Lennox Industries Inc Publications Litho U S A ELECTRICAL DATA General Model No 10ACC 018 10ACC 024 10ACC 024 10ACC 030 10ACC 030 10ACC 036 10ACC 042 10ACC 048 10ACC 060 Data 230 230 01 230 02 230 01 230 03 230 230 230 230 Line voltage data 60hz 208 230v 208 230v 208 230v 208 230v 208 230v 208 230v 208 230v 208 230v 208 230v 1ph 1ph 1ph 1ph 1ph 1ph 1ph 1ph 1ph
6. pressure of 23 000 microns 29 01 inches of mercu ry During the early stages of evacuation it is desir able to close the manifold gauge valve at least once to determine if there is a rapid rise in absolute pressure A rapid rise in pressure indicates a relatively large leak If this occurs repeat the leak testing procedure Page 8 NOTE The term absolute pressure means the total actual pressure within a given volume or system above the absolute zero of pressure Absolute pres sure in a vacuum is equal to atmospheric pressure mi nus vacuum pressure O 1 When the absolute pressure reaches 23 000 microns 29 01 inches of mercury close the manifold gauge valves turn off the vacuum pump and disconnect the manifold gauge center port hose from vacuum pump Attach the manifold center port hose to a nitrogen cylin der with pressure regulator set to 150 psig 1034 kPa and purge the hose Open the manifold gauge valves to break the vacuum in the line set and indoor unit Close the manifold gauge valves A CAUTION Danger of Equipment Damage Avoid deep vacuum operation Do not use compres sors to evacuate a system Extremely low vacuums can cause internal arcing and compressor failure Damage caused by deep vacuum operation will void warranty 7 Shut off the nitrogen cylinder and remove the manifold gauge hose from the cylinder Open the manifold gauge valves to release the nitrogen from the line set and indoor un
7. Contactor K1 The compressor is energized by a contactor located in the control box See figure 2 Single pole contactors are used in 10ACC units K1 is energized by the indoor thermostat terminal Y1 24V when thermostat demand is present 10ACC units are not equipped with a 24V transformer All 24 VAC controls are powered by the indoor unit Refer to wiring diagram A DANGER Electric Shock Hazard May cause injury or death Line voltage is present at all compo nents when unit is not in operation on units with single pole contactors Disconnect all remote electrical power supplies before opening unit panel Unit may have multiple power supplies 2 Dual Capacitor C12 The compressor and fan in 10ACC series units use per manent split capacitor motors The capacitor is located inside the unit control box see figures 2 and 3 A single dual capacitor C12 is used for both the fan motor and the compressor see unit wiring diagram The fan side and the compressor side of the capacitor have different MFD ratings For ratings see side of capacitor 3 Start Capacitor C7 option Start capacitor C7 is wired in parallel with the compres sor side of the dual capacitor The capacitor is located in side the unit control box see figure 2 C7 is switched off by potential relay K31 when the compressor nears full speed The start capacitor is rated at 330 VAC and has an MFD rating of 176 216 4 Potential Start R
8. O closes energizing compressor B1 and outdoor fan motor B4 4 Compressor B1 and outdoor fan motor B4 begin immediate operation END OF COOLING DEMAND 5 Cooling demand is satisfied Terminal Y1 is de energized 6 Compressor contactor K1 is de energized 7 K1 1 opens and compressor B1 and outdoor fan motor B4 are de energized and stop immediately Page 12
9. Rec max fuse size amps 20 25 25 30 30 35 40 50 60 TIMinimum circuit ampac 11 6 14 3 16 1 17 3 18 4 20 4 23 31 2 35 2 ity Compressor Rated load amps 8 6 10 8 12 2 12 9 14 1 16 2 17 9 21 8 26 6 Locked rotor amps 49 0 60 61 69 4 73 0 96 103 131 170 Power factor 0 97 0 96 0 96 0 92 0 95 0 90 0 84 0 80 0 90 Condenser Full load amps 0 8 0 8 0 8 1 1 0 8 1 7 1 9 1 9 0 9 Fan Motor Locked rotor amps 1 2 1 2 1 2 1 9 1 2 3 1 41 41 41 T Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements NOTE Extremes of operating range are plus 10 and minus 5 of line voltage SPECIFICATIONS General Model No 10ACC 018 10ACC 024 10ACC 030 10ACC 036 10ACC 042 10ACC 048 10ACC 060 Data Nominal Tonnage kW 1 5 5 3 2 7 0 2 5 8 8 3 10 6 3 5 12 3 4 14 1 5 17 6 Connections Liquid line 0 d in mm 213 8 9 5 213 8 9 5 3 8 9 5 3 8 9 5 3 8 9 5 3 8 9 5 3 8 9 5 sweat Suction line 0 d in mm 5 8 15 9 3 4 19 1 3 4 19 1 3 4 19 1 7 8 22 2 7 8 22 2 1 1 8 28 6 Refrigerant HCFC 22 charge furnished 3lbs 7 oz 3 Ibs 9 oz 3 Ibs 10 oz 4 Ibs 10 oz 5 Ibs 1 oz 6 lbs 0 oz 8 Ibs 2 oz 1 56 kg 1 62 kg 1 64 kg 2 12 kg 2 28 kg 2 72 kg 3 67 kg Condenser Net face area sq ft m2 Outer Coil 10 0 0 93 10 0 0 93 10 0 0 93 11 41 1 06 13 31 1 24 15 11 1 40 20 83 1 94 Coil Inner Coil is 5 4 0 50 gaa
10. Tube diameter in mm 5 16 7 9 5 16 7 9 5 16 7 9 5 16 7 9 No of rows 1 1 1 37 1 Fins per inch m 18 709 18 709 2 22 866 22 866 Condenser Diameter in mm 16 406 16 406 18 457 18 457 18 457 18 457 22 559 Fan No of blades 3 3 3 3 4 4 4 Motor hp W 1 10 75 1 10 75 1 10 75 1 4 187 1 3 249 1 3 249 1 3 249 Cfm L s 1730 815 1730 815 1730 815 2510 1185 2800 1320 2950 1390 3900 1840 Rpm 1070 1070 1070 1103 1116 1100 1100 Watts 184 184 184 266 299 310 367 Shipping weight 1 package Ibs kg 126 57 107 49 107 49 140 64 140 64 196 89 199 90 OPTIONAL ACCESSORIES MUST BE ORDERED EXTRA Crankcase Heater 68887 90P12 90P12 68887 90P12 90P12 90P12 Hail Guards 17L71 17L71 17L71 17L73 17L73 17L73 17L73 Low Ambient Kit for Expansion Valve systems only 24H77 24H77 24H77 24H77 24H77 24H77 24H77 Mounting Model No MB2 S 69J06 Base Net Weight 6 Ibs 3 kg Dimensions in mm 22 1 4x22 1 4x3 565 x 565x76 Timed Off Control LB 61378A 47J35 Unit Stand Off Kit 94545 94345 94J45 94345 94J45 94545 94J45 Unit Hard Start Kit 64J09 10J42 10J42 64J09 81J69 81J69 81J69 Compressor Monitor Canada only T6 1469 45F08 Refrigerant charge sufficient for 15 ft 4 5 m length of refrigerant lines 2 3 8 in x 5 16 in 9 5 mm x 7 9 mm reducer bushing not furnished is required for liquid line connection Page 2
11. ailable or if unit is being charged during warm weather follow one of the other procedures outlined below 1 Recover the refrigerant from the unit 2 Conduct a leak check then evacuate as previously outlined 3 Weigh in the factory charge according to the amount recorded on the outdoor unit nameplate Approach and Normal Operating Pressures TXV Systems Outdoor Temp gt 65 F 18 C The following procedure is intended as a general guide and is for use on expansion valve systems only For best results indoor temperature should be 70 F 21 C to 80 F 26 C Monitor system pressures while charging 1 Record outdoor ambient temperature using a digital thermometer 2 Attach high pressure gauge set and operate unit for several minutes to allow system pressures to stabilize 3 Compare stabilized pressures with those provided in table 5 Normal Operating Pressures Minor varia tions in these pressures may be expected due to differ ences in installations Significant differences could mean that the system is not properly charged or that a problem exists with some component in the system Pressures higher than those listed indicate that the system is overcharged Pressures lower than those listed indicate that the system is undercharged Verify adjusted charge using the approach method 4 Outdoor temperature should be 65 F 18 C or above o 1 1 1 1 1 Use the same digital thermometer used to chec
12. arging the system Minor variations in these pressures may be due to differ ences in installations Significant deviations could mean that the system is not properly charged or that a problem exists with some component in the system See table 5 V Maintenance AWARNING Electric shock hazard Can cause inju ry or death Before attempting to per form any service or maintenance turn the electrical power to unit OFF at dis connect switch es Unit may have multiple power supplies Maintenance and service must be performed by a qualified installer or service agency At the beginning of each cooling season the system should be checked as follows 1 Clean and inspect the condenser coil The coil may be flushed with a water hose Make sure power is off be fore cleaning 2 Visually inspect connecting lines and coils for evidence of oil leaks Page 11 3 Check wiring for loose connections 4 Check for correct voltage at unit unit operating 5 Check the compressor and condenser fan motor amp draw NOTE If the owner complains of insufficient cooling the unit should be gauged and the refrigerant charge should be checked Refer to the charging section in this instruction Evaporator Coil 1 Clean coil if necessary 2 Check connecting lines and coils for evidence of oil leaks 3 Check the condensate pan line and clean it if necessary Indoor Unit 1 Clean or change filters 2 Adjust b
13. elay K31 option Potential relay K31 is located inside the unit control box see figure 2 The relay is normally closed when contac tor K1 is de energized When K1 energizes the com pressor immediately begins start up K31 remains closed during compressor start up and the start capacitor C7 re mains in the circuit When the compressor reaches 75 of its speed K31 is energized When K31 energizes the contacts open and the start capacitor C7 is taken out of the circuit Page 4 B Compressor For compressor specifications see ELECTRICAL DATA section in this manual or the compressor name plate SCROLL COMPRESSOR DISCHARGE SUCTION FIGURE 4 1 Scroll Compressor The scroll compressor design is simple efficient and re quires few moving parts A cutaway diagram of the scroll compressor is shown in figure 4 The scrolls are located in the top of the compressor can and the motor is located just below The oil level is immediately below the motor The scroll is a simple compression concept centered around the unique spiral shape of the scroll and its inherent properties Figure 5 shows the basic scroll form Two iden tical scrolls are mated together forming concentric spiral shapes figure 6 One scroll remains stationary while the other is allowed to orbit figure 7 Note that the orbiting scroll does not rotate or turn but merely orbits the station ary scroll SCROLL FORM FIGURE 5 Page 5
14. ench here service port to outdoor coil service port cap to indoor coil Schrader SUCTION LINE BALL TYPE SERVICE VALVE VALVE OPEN USE ADJUSTABLE WRENCH ROTATE STEM CLOCKWISE 90 TO CLOSE ROTATE STEM COUNTER CLOCKWISE 90 TO OPEN STEM CAP INLET FROM INDOOR COIL SHOWN OPEN OUTLET TO SERVICE PORT CAP SCHRADER CORE FIGURE 11 IV CHARGING A Pumping Down System A CAUTION Deep vacuum operation operating compressor at 0 psig or lower can cause internal fusite arcing resulting in a damaged or failed compressor This type of damage will result in denial of warranty claim The system may be pumped down when leak checking the line set and indoor coil or making repairs to the line set or indoor coil 1 Attach gauge manifold 2 Front seat close liquid line valve 3 Start outdoor unit 4 Monitor suction gauge Stop unit when 0 psig is reached 5 Front seat close suction line valve B Leak Testing To Be Done Before Evacuating After the line set has been connected to the indoor and outdoor units check the line set connections and indoor unit for leaks A WARNING Refrigerant can be harmful if it is inhaled Refrigerant must be used and recovered responsibly Failure to follow this warning may result in personal injury or death AWARNING Danger of explosion Can cause equipment damage injury or death Never use oxygen to pressurize a re frigeration o
15. ications arise in which charging must occur in the colder months The method of charging is determined by the uni s refrigerant metering device and the outdoor ambient temperature Measure the liquid line temperature and the outdoor ambi ent temperature as outlined below 1 Connect the manifold gauge set to the service valves low pressure gauge to suction valve service port high pressure gauge to liquid valve service port Connect the center manifold hose to an upright cylinder of HCFC 22 Close manifold gauge set valves 2 Set the room thermostat to call for heat This will create the necessary load for properly charging the system in the cooling cycle 3 Use a digital thermometer to record the outdoor ambi ent temperature 4 When the heating demand has been satisfied switch the thermostat to cooling mode with a set point of 68 F 20 C When pressures have stabilized use a digital thermometer to record the liquid line temperature 5 The outdoor temperature will determine which charg ing method to use Proceed with the appropriate charg ing procedure Weighing in the Charge Fixed Orifice or TXV Systems Outdoor Temp lt 60 F 16 C If the system is void of refrigerant or if the outdoor ambient temperature is cool the refrigerant charge should be weighed into the unit according to the total amount shown on the unit nameplate This may be done after any leaks have been repaired If weighing facilities are not av
16. igerant piping consists of liquid and suction lines from the condensing unit sweat connections to the indoor evaporator coil flare or sweat connections Use Lennox L15 sweat non flare series line sets as shown in table 1 or use field fabricated refrigerant lines Separate discharge and suction service ports are pro vided outside the unit for connection of gauge manifold during charging procedure TABLE 1 wea CaaS LTS Time Sei 516i 5 8in aaa 8 mm 16 mm 4 5m 15m L15 41 15 ft 50 ft 10ACC 024 3 8 in 3 4 in 10ACC 030 10 mm 19 mm 7 10ACC 036 10ACC 042 3 8 in 7 8 in 10ACC 048 10 mm 22 mm 10ACC 018 4 5m 15m L15 65 15 ft 50 ft 4 5m 15m an in 5 1 8 n Field Field fabricate See 9351 L9 TA Page 6 B Service Valves The liquid and vapor line service valves figures 10 and 11 and gauge ports are accessible from outside the unit The valve is equipped with a service port The service ports are used for leak testing evacuating charging and checking charge A schrader valve is factory installed A service port cap is supplied to protect the schrader valve from contamination and serve as the primary leak seal NOTE Always keep valve stem caps clean To Access Schrader Port 1 Remove service port cap with an adjustable wrench 2 Connect gauge to the service port 3 When testing is completed replace service port cap Tighten finger tight then an additional 1 6
17. it 1 Reconnect the manifold gauge to the vacuum pump turn the pump on and continue to evacuate the line set and indoor unit until the absolute pressure does not rise above 500 microns 29 9 inches of mercury within a 20 minute period after shutting off the vacuum pump and closing the manifold gauge valves 9 When the absolute pressure requirement above has been met disconnect the manifold hose from the vacu um pump and connect it to an upright cylinder of HCFC 22 refrigerant Open the manifold gauge valves to break the vacuum from 1 to 2 psig positive pressure in the line set and indoor unit Close manifold gauge valves and shut off the HCFC 22 cylinder and remove the manifold gauge set D Charging Units are factory charged with the amount of HCFC 22 re frigerant indicated on the unit nameplate This charge is based on a matching indoor coil and outdoor coil with a 15 ft 4 5 m line set For varying lengths of line set refer to table 2 for refrigerant charge adjustment A blank space is provided on the nameplate to list the actual field charge Page 9 TABLE 2 Liquid Line Oz per 5 ft g per 1 5 m adjust Set Diameter from 15 ft 4 5 m line set 3 8 in 10 mm 3 ounce per 5 ft 85g per 1 5 m If line length is greater than 15 ft 4 5 m add this amount If line length is less than 15 ft 4 5 m subtract this amount The condensing unit should be charged during warm weather However appl
18. k out door ambient temperature to check liquid line tempera ture Verify the unit charge using the approach method The difference between the ambient and liquid temper atures should match values given in table 3 Refriger ant must be added to lower approach temperature and removed to increase approach temperature Loss of charge results in low capacity and efficiency If the values don t agree with the those in table 3 add refrigerant to lower the approach temperature or re cover refrigerant from the system to increase the ap proach temperature Table 3 Approach Temperature Modelno Liquid Line Outdoor Ambient F C 110ACC 018 210ACC 018 OACC 024 01 OACC 024 02 OACC 030 0 OACC 030 0 10ACC 036 10ACC 042 10ACC 048 10ACC 060 NOTE For best results use the same digital thermometer to check both outdoor ambient and liquid temperatures 1Tecumseh compressor 2Copeland compressor Charging Using the Subcooling Method Fixed Orifice Systems Outdoor Temp gt 65 F 18 C If you charge a fixed orifice system when the outdoor ambi ent is 65 F 18 C or above use the subcooling method to charge the unit 1 With the manifold gauge hose still on the liquid service port and the unit operating stably use a digital ther mometer to record the liquid line temperature 2 At the same time record the liquid line pressure reading 3 Use a temperature pressure chart for HCFC 22 to de termine the satu
19. lower speed for cooling The pressure drop over the coil should be measured to determine the correct blower CFM Refer to the unit information service manual for pressure drop tables and procedure 3 Belt Drive Blowers Check belt for wear and proper tension 4 Check all wiring for loose connections 5 Check for correct voltage at unit blower operating 6 Check amp draw on blower motor VI WIRING DIAGRAM AND SEQUENCE OF OPERATION 10ACC OPERATING SEQUENCE OUTDOOR FAN TO 24 VAC POWER SOURCE 20 VA MINIMUM NEC CLASS 2 COMPRESSOR a CONTACTOR a L _2 POWER A KI I SOURCE 208 230 60 1 ALTERNATE CONTACTOR AND WIRING EQUIPMENT GROUND c yI TO 24 VAC WENT NC BOURGE 20VA ELECTRIC SHOCK HAZARD CAN CAUSE INJURY OR DEATH UNIT MUST BE GROUNDED IN ACCORDANCE MINIMUM NEC WITH NATIONAL AND LOCAL CODES CLASS 2 p ucE Gee 780 992 QAeE B42 25891 90 CURRENT PROTECTION SIZE 1OACC 030 230 01 03 0ACC 060 230 01 02 OACC 036 230 01 02 upersedes Form No LINE VOLTAGE FIELD INSTALLED CLASS VOLTAGE FIELD INSTALLED 555 410W New Form No 534 463W 2003 Lennox Industries Inc Litho U S A NOTE The thermostat used may be electromechanical or electronic NOTE Transformer in indoor unit supplies power 24 VAC to the thermostat and outdoor unit controls COOLING 1 Cooling demand initiates at Y1 in the thermostat 2 24VAC energizes compressor contactor K1 3 K1 1 N
20. r air conditioning system Oxygen will explode on contact with oil and could cause personal injury A WARNING Danger of explosion Can cause equipment damage injury or death When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning system use a regulator that can control the pressure down to 1 or 2 psig 6 9 to 13 8 kPa Using an Electronic Leak Detector or Halide 1 Connect a cylinder of HCFC 22 to the center port of the manifold gauge set 2 With both manifold valves closed open the valve on the HCFC 22 cylinder vapor only 3 Open the high pressure side of the manifold to allow the HCFC 22 into the line set and indoor unit Weigh in a trace amount of HCFC 22 A trace amount is a maxi mum of 2 ounces 57 g or 3 pounds 31 kPa pres sure Close the valve on the HCFC 22 cylinder and the valve on the high pressure side of the manifold gauge set Disconnect the HCFC 22 cylinder 4 Connect a cylinder of nitrogen with a pressure regulat ing valve to the center port of the manifold gauge set 5 Connect the manifold gauge set high pressure hose to the vapor valve service port Normally the high pres sure hose is connected to the liquid line port however connecting it to the vapor port better protects the man ifold gauge set from high pressure damage 6 Adjust the nitrogen pressure to 150 psig 1034 kPa Open the valve on the high side of the manifold gauge se
21. ration temperature for the liquid line pressure reading 4 Subtract the liquid line temperature from the saturation temperature according to the chart to determine sub cooling Saturation temperature Liquid line tem perature Subcooling 5 Compare the subcooling value with those in table 4 If subcooling is greater than shown some refrigerant must be recovered If subcooling is less than shown some refrigerant must be added Table 4 oF LIQUID SUBCOOLING 1 F 6 C C 118 248 24 2 24 1 30 1 30 3 36 42 48 60 65 14 13 10 14 14 18 8 7 5 6 8 8 7o 13113 9 14 14 21 7 7 5 8 8 7 14 13 8 13 8 7 4 5 7 go 13 12 7 1 27 7 67 9 7 85 13 4 6 1 29 7 67 3 3 6 7 1 2 T 90 12 4 5 2 82 7 6 2 8 6 7 7 95 11 10 1 11 1 35 5 6 too 1 9 4 9 10 38 6 5 2 2 5 5 6 105 10 8 3 8 9 12 41 4 5 1 7 4 5 6 67 110 9 3 7 7 11 43 6 4 Jan 15 8 7 2 6 m 8 45 5 4 1 1 3 3 63 w 1 4 Notes Outdoor temperature Tecumseh compressor 2Copeland compressor Page 10 Table 5 Normal Operating Pressures In psig liquid and suction 2 psig Out Coil Entering eee oe Teee oe me fee Jae F C eo pee pee eo oe oe 030 01 036 ORE R LIQ es er
22. t which will pressurize line set and indoor unit 7 After a few minutes open a refrigerant port to ensure the refrigerant you added is adequate to be detected Amounts of refrigerant will vary with line lengths Check all joints for leaks Purge nitrogen and HCFC 22 mixture Correct any leaks and recheck C Evacuating the System Evacuating the system of noncondensables is critical for proper operation of the unit Noncondensables are defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system Noncondensables and water vapor combine with refrigerant to produce substances that corrode copper pip ing and compressor parts NOTE This evacuation process is adequate for a new installation with clean and dry lines If excessive mois ture is present the evacuation process may be re quired more than once A IMPORTANT Use a thermocouple or thermistor electronic vacuum gauge that is calibrated in microns Use an instrument that reads from 50 microns to at least 10 000 microns 1 Connect manifold gauge set to the service valve ports e low pressure gauge to vapor line service valve e high pressure gauge to liquid line service valve 2 Connect micron gauge 3 Connect the vacuum pump with vacuum gauge to the center port of the manifold gauge set 4 Open both manifold valves and start the vacuum pump 5 Evacuate the line set and indoor unit to an absolute
23. tion can cause internal fu site arcing resulting in damaged internal parts and will re sult in compressor failure Never use a scroll compressor for evacuating or pumping down the system This type of damage can be detected and will result in denial of warran ty claims NOTE During operation the head of a scroll compressor may be hot since it is in constant contact with discharge gas ORBITING SUCTIONY SCROLL POCKET 1 Me STATIONARY SCROLL SUCTION HOW A SCROLL WORKS Nez MOVEMENT OF ORBIT SHOE y 2 FLANKS SEALED BY CENTRIFUGAL FORCE ee FIGURE 7 C Condenser Fan Motor All units use single phase PSC fan motors which require a run capacitor In all units the condenser fan is controlled by the compressor contactor ELECTRICAL DATA tables in this manual show specifi cations for condenser fans used in 10ACCs Access to the condenser fan motor on all units is gained by removing the seven screws securing the fan assem bly See figure 8 The condenser fan motor is removed from the fan guard by removing the four nuts found on the top panel See figure 9 if condenser fan motor re placement is necessary CONDENSER FAN MOTOR AND COMPRESSOR ACCESS Remove 7 screws FAN GUARD _ REMOVE 7 SCREWS SECURING FAN GUARD REMOVE FAN GUARD FAN ASSEMBLY FIGURE 8 Remove 4 nuts ALIGN FAN HUB FLUSH WITH END OF SHAFT FIGURE 9 lll REFRIGERANT SYSTEM A Plumbing Field refr
24. turn To Open Liquid or Vapor Line Service Valve 1 Remove stem cap with an adjustable wrench 2 Using service wrench and hex head extension 3 16 for liquid line and 5 16 for vapor line back the stem out counterclockwise until the valve stem just touches the re taining ring 3 Replace stem cap tighten firmly Tighten finger tight then tighten an additional 1 6 turn To Close Liquid or Vapor Line Service Valve 1 Remove stem cap with an adjustable wrench 2 Using service wrench and hex head extension 3 16 for liq uid line and 5 16 for vapor line turn stem clockwise to seat the valve Tighten firmly 3 Replace stem cap Tighten finger tight then tighten an additional 1 6 turn Vapor Line Ball Type Service Valve 5 Ton Only A ball type full service valve is used on 10ACC 5 ton units These suction line service valves function the same way differences are in construction Valves are not rebuildable If a valve has failed it must be replaced A ball valve is illustrated in figure 11 The ball valve is equipped with a service port A schrader valve is factory installed A service port cap is supplied to protect the schrader valve from contamination and assure a leak free seal Page 7 Service Valve Valve Closed stem cap service y port Be to outdoor coil service Schrader valve open to line set when valve is closed front seated valve front seated Service Valve insert hex stem cap wr
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