Assessments - 2, GPA: 4
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Use all service ports and open all flow-control devices, including solenoid valves. CAUTION: If ANY refrigerant tubing is buried, provide a 6 in. vertical rise at service valve. Refrigerant tubing lengths up to 36 in. may be buried without further special consideration. For lengths above 36 in., consult your local distributor. CAUTION: To prevent damage to unit or service valves observe the following: •Use a brazing shield. •Wrap service valves with wet cloth or use a heat-sink material. Outdoor units may be connected to indoor section using accessory tubing package or field-supplied refrigerant grade tubing of correct size and condition. For tubing requirements beyond 50 ft in length or 20 ft vertical differential, substantial capacity and performance losses can occur. Following the recommendations in the Residential Split System Long-Line Application Guideline will reduce these losses. Refer to Table 1 for field tubing equivalent line length. 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. A. Outdoor Unit Connected to Factory-Approved Indoor Unit Outdoor unit contains correct system refrigerant charge for operation with indoor unit of same size when connected by 15 ft of field-supplied or factory-accessory tubing. Check refrigerant charge for maximum efficiency. B. Refrigerant Tubing Connect tubing to fittings on outdoor unit vapor and liquid service valves. (See Table 1.) Use refrigerant grade tubing. Refer to appropriate section below for type of service valves installed on unit. C. Sweat Connection CAUTION: To avoid valve damage while brazing, service valves must be wrapped in a heat-sinking material such as a wet cloth. Remove plastic retainer holding outdoor piston in liquid service valve and connect sweat/flare adapter provided to valve. (See Fig. 6.) Connect refrigerant tubing to fittings on outdoor unit vapor and liquid service valves. Service valves are closed from factory and ready for brazing. After wrapping service valve with a wet cloth, tubing set can be brazed to service valve using either silver bearing or non-silver bearing brazing material. Consult local code requirements. Refrigerant tubing and indoor coil are now ready for leak testing. This check should include all field and factory joints. D. 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. Pay close attention to feeder tubes, making sure wire ties on feeder tubes are secure and tight. —3— PISTON BODY PISTON PISTON RETAINER SWEAT/FLARE ADAPTER STRAINER PISTON BODY PISTON PISTON RETAINER SWEAT/FLARE ADAPTER STRAINER A97512 Fig. 6—Liquid Service Valve with Sweat Adapter Tube DISCONNECT PER N.E.C. AND/OR LOCAL CODES CONTACTOR FIELD POWER WIRING BLUE3 PHASE ONLY FIELD GROUND WIRING GROUND LUG A94025 Fig. 7—Line Power Connections IX. MAKE ELECTRICAL CONNECTIONS WARNING: To avoid personal injury or death, do not supply power to unit with compressor terminal box cover removed. 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 or phase imbalance (3 phase) may fluctuate above or 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. A. 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. WARNING: 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. Failure to follow this warning can result in an electric shock, fire, or death. B. 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. 7. C. Connect Control Wiring Route 24v control wires through control wiring grommet and connect leads to control wiring. (See Fig. 8 and 9.) Use No. 18 AWG color-coded, insulated (35°C minimum) wire. If thermostat is located more than 100 ft 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 ...
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