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Lennox International Inc. 2SCU13 manual

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Table of contents for the manual

  • Page 1

    # 48283B006 Page 1 Save these instructions for future reference INST ALLA TION AND MAINTENANCE INSTRUCTIONS 2SCU13 Series S plit System Air Conditioner Sharp metal edges can cause injury . When installing the unit, use care to avoid sharp edges. W ARNING Installation and servicing of air conditioning equipment can be hazardous due to internal refri[...]

  • Page 2

    Page 2 # 48283B006 INST ALLA TION Location of Unit Outdoor unit s operate under a wide range of weather conditions; therefore, multiple factors must be considered when positioning the unit. The unit must be positioned to give adequate clearances for sufficient airflow and servic- ing. Refer to Figure 1 for installation clearances. General Read this[...]

  • Page 3

    # 48283B006 Page 3 Figure 2 Slab Mounting 2° or 2" per 5' slope tolerance aw ay from b uilding str ucture. Discharge Air Mounting Slab Ground Le vel Building Structure Figure 3 Wind Barrier Construction Pre vailing Winter Winds 24" Wind Barrier Inlet Air Inlet Air Inlet Air Electrical Wiring All field wiring must be done in accordan[...]

  • Page 4

    Page 4 # 48283B006 T able 2 Refrigerant Line Set Diameters (in.) For inst allations exceeding 5 0', cont act T echnical Services at (419) 483-4840. e n i L n o i t c u S H U T B e z i S d n a h t g n e L t e S e n i L . t f 2 1 . t f 5 2 . t f 0 5 . t f 5 7 . t f 0 0 1 0 0 0 , 8 14 / 34 / 34 / 34 / 34 / 3 0 0 0 , 4 2 4 / 3 4 / 3 4 / 3 4 / 3 8 [...]

  • Page 5

    # 48283B006 Page 5 Figure 6 T o hang line set from joist or rafter , use either metal strapping material or anchored heavy n ylon wire ties. Strapping Material (around vapor line only) 8 ’ 8 ’ T ape or Wire Tie Strap the v apor line to the joist or rafter at 8 intervals then str ap the liquid line to the vapor line . ’ Floor Joist or Roof Raf[...]

  • Page 6

    Page 6 # 48283B006 Figure 8 Refrigerant Line Set s: Inst alling V ertical Runs (new construction shown) Outside W all W ood Block Between Studs IMPOR T ANT: Refrigerant lines must not contact wall. V apor Line Liquid Line Wire Tie Inside W all Strap Slee ve Wire Tie Wire Tie Strap W ood Block Slee ve V apor Line Wrapped with Armaflex Liquid Line Ca[...]

  • Page 7

    # 48283B006 Page 7 T o install an expansion valve (see Figure 9): 1. Separate the distributor assembly and remove the piston orifice and used teflon seal. Insert nozzle end of Figure 9 Metering Device Inst allation the expansion valve along with a new teflon seal into the distributor and tighten to 20 – 30 ft. lbs. Use backup wrench on all wrench[...]

  • Page 8

    Page 8 # 48283B006 T o Close Liquid or Suction Line Service V alve: 1. Remove the stem cap with an adjustable wrench. 2. Use a service wrench with a hex-head extension to turn the stem clockwise to seat the valve. T ighten firmly . 3. Replace the stem cap. T ighten finger tight, then tighten an additional 1/6 turn. Suction Line (Ball T ype) Service[...]

  • Page 9

    # 48283B006 Page 9 5. Evacuate the line set and indoor unit to a minimum of 500 microns or lower . During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once to determine if there is a rapid rise in pressure. A rapid rise in pressure indicates a relatively large leak. If this occurs, the leak testing proc[...]

  • Page 10

    Page 10 # 48283B006 If the system is void of refrigerant, clean the system using the procedure described below . 1. Use dry nitrogen to pressurize the system and check for leaks. Repair leaks, if possible. 2. Evacuate the system to remove as much of the moisture as possible. 3. Use dry nitrogen to break the vacuum. 4. Evacuate the system again. 5. [...]

  • Page 11

    # 48283B006 Page 11 Charge Using Weigh-In Method (Fixed Orifice/TXV Systems) If the system is void of refrigerant, or if the outdoor ambient temperature is cool, first locate and repair any leaks then use the weigh-in method to charge the unit. 1. Recover the refrigerant from the unit. 2. Conduct a leak check, then evacuate as previously outlined. [...]

  • Page 12

    Page 12 # 48283B006 Pressures higher than those listed indicate that the system is overcharged. Pressures lower than those listed indicate that the system is undercharged. V erify adjusted charge using the approach method. 4. Use the same digital thermometer to check liquid line temperature. 5. Subtract the outdoor ambient temperature from the liqu[...]

  • Page 13

    # 48283B006 Page 13 Normal Operating Pressures T able 9 l i o C r o o d t u O r i A g n i r e t n E e r u t a r e p m e T l e d o M 8 1 - 4 2 - 0 3 - 6 3 - 2 4 - 8 4 - 0 6 - L S L S L S L S L S L S L S ) V X T ( e v l a V n o i s n a p x E F ° 5 61 4 10 87 4 19 71 4 16 75 4 14 73 4 18 75 4 10 81 5 16 7 F ° 5 76 6 11 83 7 10 87 6 17 70 7 16 77 6 1[...]

  • Page 14

    Page 14 # 48283B006 OPERA TION Outdoor unit and indoor blower cycle on demand from the room thermostat. When the thermost at blower switch is moved to the ON position, the indoor blower operates continuously . Maintenance and service must be performed by a quali- fied installer or service agency . At the beginning of each cooling season, the system[...]

  • Page 15

    # 48283B006 Page 15 5. Check for correct voltage at unit (with unit operating). 6. Check amp-draw on blower motor . Unit nameplate _________ Actual _________ St art-Up and Performance Checklist Job Name _______________________________ Job No. ________________ Date ______________ Job Location _____________________________ City ___________________ S [...]

  • Page 16

    Page 16 # 48283B006 Figure 12 H C F 1 DESCRIPTION KEY COMPONENT A4 CONTROL - TIMED OFF B1 COMPRESSOR B4 MO TOR - OUTDOOR F AN C12 CAP ACIT OR - DU AL HR1 HEA TER - COMPRESSOR K1-1 CONT ACT OR - COMPRESSOR S4 SWITCH - HIGH PRESSURE S24 SWITCH - LOSS OF CHARGE FOR USE WITH COPPER CONDUCT ORS ONL Y . REFER TO UNIT RA TING PLA TE FOR MINIMUM CIRCUIT AM[...]

  • Page 17

    # 48283B006 Page 17 Figure 13 Three Phase Wiring Diagram P/N 48436-001 B4 OUTDOOR FA N C1 OUTDOOR F AN CAP ACIT OR A4 TIMED OFF CONTROL (IF USED) PURPLE BLACK ORANGE BLACK BLACK RED T3 T2 T1 BLACK L3 L2 L1 COMPRESSOR B1 CRANKCASE HEA TER (IF USED) HR1 2 31 T O 24 V AC POWER SOURCE 10 V A MINIMUM NEC CLASS 2 C Y1 L1 L2 L3 208-230/60/3 GROUND 2 S4 HI[...]

  • Page 18

    Page 18 # 48283B006 Limited Warranty August 1, 1997 This warranty gives you specific legal rights and you may have other rights which vary from state/province to st ate/province. W arrantor: Armstrong Air Conditioning Inc., 421 Monroe St., Bellevue, OH 4481 1 Armstrong Air Conditioning Inc. products are available under the following names: Air Ease[...]