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INSTALLATION AND MAINTENANCE INSTRUCTIONS
4AC18LT SERIES
Split System Air Conditioner
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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 glov
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When servicing or repairing HVAC components, ensure the INSTALLATION fasteners are appropriately tightened. Table 1 shows torque values for fasteners. General Read this entire instruction manual, as well as the Inspection of Shipment instructions supplied in separate equipment, before Upon receipt of equipment, carefully inspect it for possible starting the installation. Observe and follow all shipping damage. If damage is found, it should be noted on warnings, cautions, instructional labels, an
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• Install the unit high enough above the ground or roof to If unit coil cannot be mounted away from prevailing winter allow adequate drainage of defrost water and prevent winds, a wind barrier should be constructed (See Figure 3). ice buildup. Size the barrier at least the same height and width as the outdoor unit. Mount barrier 24” from the sides of the unit in • In heavy snow areas, do not locate the unit where drifting the direction of the prevailing winds. snow will occur. The unit base sh
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Placement Brazing Connection Procedure Be aware that some localities are adopting sound ordinances 1. Cut ends of refrigerant lines square (free from nicks or based on how noisy the unit is at the neighbor’s home, not dents). Debur the ends. The pipe must remain round; do at the original installation. Install the unit as far as possible not pinch end of line. from the property line. When possible, do not install the unit directly outside a bedroom window. Glass has a verry high 2. Before
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Refrigerant Piping Thermostat Designations If the 4AC18LT unit is being installed with a new indoor coil and line set, the refrigerant connections should be made as outlined in this section. If an existing line set and/or indoor coil will be used to complete the system, refer to this section as well as the section that follows entitled - Flushing Existing Line Set and Indoor Coil. If this unit is being matched with an approved line set or indoor coil which was previously charged with R-22 refr
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6. Braze the line set to the service valve. Quench the joints with water or a wet cloth to prevent heat damage to the CAUTION valve core and opening port. The tube end must stay bottomed in the fitting during final assembly to ensure When flushing existing line set and/or indoor coil, be sure to proper seating, sealing, and rigidity. empty all existing traps. Residual mineral oil can act as an insulator, preventing proper heat transfer. It can also clog 7. Install the thermal expansion v
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Refrigerant Line Sets: Transition from Vertical to Horizontal Automotive Anchored Muffler-Type Heavy Nylon Hanger Wire Tie Strap Liquid Strap Liquid Line to Vapor Line to Vapor Line Wall Wall Line Stud Stud Liquid Line Liquid Line Vapor Line– Wrapped Vapor Line– Wrapped Metal Sleeve in Armaflex Metal Sleeve in Armaflex Figure 7 Refrigeraant Line Sets: Installing Vertical Runs (new construction shown) IMPORTANT: Refrigerant NOTE: Similar installation practices lines must not contact wall. shou
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Flushing Existing Line Set and Indoor Coil If the existing outdoor unit is equipped with manual shutoff This procedure should not be performed on systems valves AND new R-22 refrigerant will be used to flush the which contain contaminants, such as compressor burn system: out. Start the existing R-22 refrigerant system in cooling mode Required Euipment and close the liquid line valve. Pump all the existing R-22 The following equipment is needed to flush the existing line refrigerant back into th
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4. Remover the existing R-22 refrigerant flow control orifice An R410A system will not operate properly with an R-22 or thermal expansion valve before continuing with flushing metering device. procedures. R-22 flow control devices are not approved for use with R410A refrigerant and may prevent proper flushing. Install the refrigerant metering device as shown in Figure Use a field-provided fitting to reconnect the lines. 10. Do not twist cap tubes when loosening the seal nut from the orifice h
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3. Connect the external equalizer line to the equalizer port Suction Line (Ball Type) Service Valve on the suction line and tighten to 8 ft.lbs. Suction line (ball type) service valves function the same way as the other valves; the difference is in the construction (See 4. Strap the superheat sensing bulb to the suction header. Figure 12). If installing an expansion valve on an indoor coil that The ball valve is equipped with a service port with a factory- previously used a fixed orifice, be s
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3. Open the high pressure side of the manifold to allow R410A into the line set and indoor unit. Weigh in a trace amount of R410A. (A trace amount is a maximum of 2 oz. of refrigerant or 3 lbs. pressure.) Close the valve on the R410A cylinder and the valve on the high pressure side of the manifold gauge set. Disconnect the R410A cylinder. 4. Connect a cylinder of nitrogen with a pressure regulating valve to the center port of the manifold gauge set. When using high pressure gas such as ni
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4. Open both manifold valves and start vacuum pump. 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 procedure must be repeated. 6. When 500 microns or lower is maintained, close the manifold gauge valves, turn off th
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Units are factory charged with the amount of R410A START-UP refrigerant indicated on the unit rating plate. This charge is based on a matching indoor coil and outdoor coil with 15’ line set. For varying lengths of line set, refer to Table 5 for CAUTION refrigerant charge adjustment. A blank space is provided If unit is equipped with a crankcase heater, it should be on the unit rating plate to list the actual field charge. energized 24 hours before unit start-up to prevent compressor damage
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1. Connect the manifold gauge set to the service valve ports Blocking Outdoor Coil as follows (See Figure 13): Outdoor coil should be • Low pressure gauge to suction line service valve blocked one side at a time with cardboard or plastic • High pressure gauge to liquid line service valve sheet until proper testing pressures are reached 2. Close manifold gauge set valves. Connect the center manifold hose to an upright cylinder of R410A. CARDBOARD OR PLASTIC SHEET 3. If room temperature
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R410A Temperature/Pressure Chart Subcooling Values Temp. Pressure Temp. Pressure Temp. Pressure F Psig F Psig F Psig 32 100.8 74 214.0 116 396.0 33 102.9 75 217.4 117 401.3 34 105.0 76 220.9 118 406.7 35 107.1 77 224.4 119 412.2 Table 7 36 109.2 78 228.0 120 417.7 37 111.4 79 231.6 121 423.2 38 113.6 80 235.3 122 428.8 ° Saturation Temperature °F 39 115.8 81 239.0 123 434.5 _ ° Liquid Line Temperature °F 40 118.0 82 242.7 124 440.2 = 41 120.3 83 246.5 125 445.9 ° Subcooling Value
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Table 8 506469-01 Issue 1008 Page 16 of 24
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Thermostat Demand Wiring OPERATION The diagnostic module requires a thermostat demand signal to operate properly. The thermostat demand signal input, Outdoor unit and indoor blower cycle on demand from the labeled Y on the module, should always be connected to room thermostat. When the thermostat blower switch is the compressor contactor coil so that when the coil is moved to the ON position, the indoor blower operates energized, the demand signal input is 24VAC. When the continuously. Coil i
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Flash Codes Table 9 506469-01 Issue 1008 Page 18 of 24
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Flash Codes (cont.) Table 10 506469-01 Issue 1008 Page 19 of 24
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Miswired Module Troubleshooting Table 11 506469-01 Issue 1008 Page 20 of 24
