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INSTALLATION AND MAINTENANCE
INSTRUCTIONS
2SCU13 Series
Split System Air Conditioner
WARNING
The equipment covered in this manual is to be installed by trained and experienced
service and installation technicians. Improper installation, modification, service, or
use can cause electrical shock, fire, explosion, or other conditions which may cause
personal injury, death, or property damage. Use appropriate safety gear including
safety glasses and gloves when installing this equipment.
WARNING
T
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Location of Unit INSTALLATION General Outdoor units operate under a wide range of weather conditions; therefore, multiple factors must be considered Read this entire instruction manual, as well as the when positioning the unit. The unit must be positioned to instructions supplied in separate equipment, before give adequate clearances for sufficient airflow and servic- starting the installation. Observe and follow all warn- ing. Refer to Figure 1 for installation clearances. ings, cautions, instr
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1. Install line voltage power supply to unit from a properly sized disconnect switch. Any excess high voltage field Slab Mounting wiring should be trimmed or secured away from the Discharge Air low voltage field wiring. Building Structure 2. Ground unit at unit disconnect switch or to an earth ground. To facilitate conduit, a hole is in the bottom of the control box. Connect conduit to the control box using a proper conduit fitting. Units are approved for use only with copper conductors. 24V Cla
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suction riser to maintain minimum velocity at minimum energy or vibration can be expected. Close attention to capacity. Recommended line length is 50' or less. If more line set isolation must be observed. than 50' line set is required, contact Technical Services at (419) 483-4840. Following are some points to consider when placing and installing a high-efficiency outdoor unit: Table 2 shows the diameters for line sets up to 100' although vertical lift applications and trapping require- Placement
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Refrigerant Line Sets: Installing Horizontal Runs To hang line set from joist or rafter, use either metal strapping material Wire Tie or anchored heavy nylon wire ties. (around vapor line only) 8’ Strapping Material Floor Joist or (around vapor line only) Roof Rafter Tape or Wire Tie 8’ Strap the vapor line to the joist or rafter at 8’ intervals then strap the liquid line to the vapor line. Metal Sleeve Floor Joist or Roof Rafter Tape or Wire Tie Figure 6 Refrigerant Line Sets: Transition from
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Refrigerant Line Sets: Installing Vertical Runs (new construction shown) IMPORTANT: Refrigerant lines must not contact wall. Outside Wall Vapor Line Liquid Line NOTE: Similar installation practices should be used if line set is to be Wood Block installed on exterior of outside wall. Between Studs Wire Tie Inside Wall Strap Sleeve Vapor Line Wrapped with Armaflex Wire Tie Liquid Line Outside Wall Wood Block IMPORTANT: Refrigerant Wire Tie lines must not contact structure. Strap Caulk Fiberglass P
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the expansion valve along with a new teflon seal into the distributor and tighten to 20 – 30 ft. lbs. Use backup Fixed Orifice Data wrench on all wrench flats. Overtightening will crush the teflon seal and may cause a leak. Part Drill Model Number Size 2. Attach liquid line portion of distributor assembly along with new teflon seal to the inlet of the expansion 27 SCU13-1813 00484-0 .05 valve. Tighten to 20 – 30 ft. lbs. Use backup wrench 2SCU13-24 100484-12 .062 on all wrench flats. Overtighten
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Ball Type Service Valve Service Valve (Valve Open) Valve Closed Use adjustable wrench. To open, rotate stem counterclockwise 1/4 turn (90°). To close, rotate stem clockwise 1/4 turn (90°). Figure 11 Leak Testing After the line set has been connected to the indoor and outdoor units, the line set connections and indoor unit must be checked for leaks. Valve Open WARNING Figure 10 Refrigerant can be harmful if inhaled. Refrigerant To Close Liquid or Suction Line Service Valve: must always be used
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2. With both manifold valves closed, connect the cylin- 5. Evacuate the line set and indoor unit to a minimum of 500 der of HCFC-22 refrigerant. Open the valve on the microns or lower. During the early stages of evacuation, it HCFC-22 cylinder (vapor only). is desirable to close the manifold gauge valve at least once to determine if there is a rapid rise in pressure. A 3. Open the high pressure side of the manifold to allow rapid rise in pressure indicates a relatively large leak. If HCFC-22 int
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If the system is void of refrigerant, clean the system using START-UP the procedure described below. 1. Use dry nitrogen to pressurize the system and check CAUTION for leaks. Repair leaks, if possible. If unit is equipped with a crankcase heater, it should be energized 24 hours before unit 2. Evacuate the system to remove as much of the start-up to prevent compressor damage as a moisture as possible. result of slugging. 3. Use dry nitrogen to break the vacuum. 1. Rotate fan to check for frozen
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Charge Using Weigh-In Method (Fixed Orifice/TXV Systems) Subcooling Values for Fixed Orifice or 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. Outdoor Liquid Subcooling (±1°F) Temp. 1. Recover the refrigerant from the unit. -18 -24 -30 -36 -42 -48 -60 °F 63 5 1317 15 4 19 13 2. Conduct a leak check, then evacuate as previously outlined. 75 10 11 5 13 13 9 12 88 5 1
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Superheat Values for Approach Values for TXV Systems Fixed Orifice Systems (80°DB/67°WB Return Air) Model -18 -24 -30 -36 -42 -48 -60 Outdoor Ambient Temp. Superheat Temp. 601119 5 5 8 °F °F °F 68 0 3 Approach value is the liquid line temperature minus the outdoor ambient temperature (±1°F). 65 35 NOTE: For best results, use the same digital 70 0 3 thermometer to check both outdoor ambient and 75 26 liquid temperatures. 82 0 2 Table 8 85 18 92 0 1 95 8 15 00 105 0 Table 7 Pressures higher than t
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Normal Operating Pressures Model Outdoor Coil Entering Air -18 -24 -30 -36 -42 -48 -60 Temperature L S L S L S L S L S L S L S Expansion Valve (TXV) 61 5°F 10 4 8719 4 7116 4 7514 4 7318 4 7510 4 8116 5 7 76 5°F 11 6 8310 7 8717 6 7016 7 7710 6 8011 7 8718 7 7 85 5°F 12 9 8822 1 8518 9 7127 0 7811 9 8812 9 8729 0 7 92 5°F 23 2 8422 3 8720 2 8428 3 7122 3 8024 3 8020 4 8 18 05°F 25 5 8724 6 8021 6 8829 6 7824 6 8525 6 8721 7 8 14 15°F 26 9 8735 0 8923 9 8931 0 8835 0 8336 0 8833 1 8 Fixed Orifice
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OPERATION MAINTENANCE Outdoor unit and indoor blower cycle on demand from the room thermostat. When the thermostat blower switch is WARNING moved to the ON position, the indoor blower operates Before performing maintenance operations on continuously. system, turn the electric power to unit OFF at disconnect switch(es). Unit may have multiple power supplies. Electrical shock could cause personal injury or death. Maintenance and service must be performed by a quali- fied installer or service agen
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5. Check for correct voltage at unit (with unit operating). 6. Check amp-draw on blower motor. Unit nameplate _________ Actual _________ Start-Up and Performance Checklist Job Name _______________________________ Job No. ________________ Date ______________ Job Location _____________________________ City ___________________ State ______________ Installer _________________________________ City ___________________ State ______________ Unit Model No.______________ Serial No. ___________________ Ser
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OUTDOOR DUAL FAN A4 CAPACITOR TIMED OFF CONTROL PURPLE F C H TO 24 VAC (IF USED) BLACK POWER SOURCE 20 VA MINIMUM ORANGE 3 2 1 NEC CLASS 2 RED Y1 C YELLOW BLACK RS C COMPRESSOR COMPRESSOR CONTACTOR CRANKCASE HEATER (IF USED) L2 L1 GROUND 208-230/60/1 LUG GROUND BLACK L1 C SR 1 K1-1 B1 S4 HIGH 208-230/60/1 S24 LOSS YELLOW PRESSURE OF CHARGE SWITCH SWITCH (IF USED) (IF USED) RED L2 ORANGE A4 S24 BLACK S4 2 HR1 3 1 K1 H C F EQUIPMENT B4 GROUND C12 PURPLE C Y1 TO 24 VAC POWER SOURCE 20 VA MINIMUM FO
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B4 C1 OUTDOOR OUTDOOR FAN FAN A4 CAPACITOR TIMED OFF CONTROL PURPLE TO 24 VAC (IF USED) BLACK POWER SOURCE ORANGE 10 VA MINIMUM 2 31 NEC CLASS 2 BLACK C Y1 BLACK COMPRESSOR BLACK T3 T2 T1 B1 COMPRESSOR CONTACTOR CRANKCASE HEATER K1 L2 L3 L1 (IF USED) 1 L1 HR1 L2 L3 GROUND 208-230/60/3 LUG GROUND 208-230/60/3 S40 K1-1 BLACK 2 L1 B1 1 BLACK L2 S4 HIGH S24 LOSS PRESSURE OF CHARGE BLACK L3 SWITCH SWITCH (IF USED) (IF USED) ORANGE A4 S24 EQUIPMENT S4 2 HR1 C1 GROUND 3 1 K1 PURPLE S40 B4 Y1 C TO 24 VA
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Limited Warranty August 1, 1997 This warranty gives you specific legal rights and you may have other rights which vary from state/province to state/province. Warrantor: Armstrong Air Conditioning Inc., 421 Monroe St., Bellevue, OH 44811 Armstrong Air Conditioning Inc. products are available under the following names: Air Ease, Armstrong Air, American Aire, Concord Subject to the limitations stated in this warranty, we warrant to the first buyer for use the residential heating, cooling or heat
