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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 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. 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. 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. 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. 8. CONNECT CONTROL WIRING Route 24v control wires through control wiring grommet and connect leads to control wiring. See Thermostat Installation Instructions for wiring specific unit combinations. (See Fig. 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 1 and must be separated from incoming power leads. 4 Table 2—Accessory Usage ACCESSORY REQUIRED FOR LOW-AMBIENT APPLICATIONS (BELOW 55°F) REQUIRED FOR LONG-LINE APPLICATIONS* (OVER 50 FT) REQUIRED FOR BURIED LINE APPLICATIONS† (OVER 3 FT) Crankcase Heater Yes Yes Yes Evaporator Freeze Thermostat Yes No No Accumulator No No Yes Compressor Start-Assist Capacitor and Relay Yes Yes Yes MotorMaster® Control, or Low-Ambient Pressure Switch Yes No No Wind Baffle See low-ambient Instructions No No Unit Risers Recommended No No Liquid-Line Solenoid Valve or Hard-Shutoff TXV No See Long-Line Application Guideline Yes Ball-Bearing Fan Motor Yes‡ No No * For tubing line sets between 50 and 175 ft, refer to Application Guideline and Service Manual — Air Conditioners and Heat Pumps. † For buried line applications, refer to Application Guideline and Service Manual — Air Conditioners and Heat Pumps. ‡ Required for low-ambient controller (full-modulation feature) and MotorMaster® Control only. Step 13—Start-Up DISCONNECT PER N. E. C. AND/OR LOCAL CODES LUG CONTACTOR GROUND FIELD GROUND WIRING FIELD POWER WIRING A91056 Fig. 8—Line Power Connections Use furnace transformer, fan coil transformer, or accessory transformer for control power, 24v/40va minimum. NOTE: Use of available 24v accessories may exceed the minimum 40va power requirement. Determine total transformer loading and increase the transformer capacity or split the load with an accessory transformer as required. To prevent compressor damage or personal injury, observe the following: •Do not overcharge system with refrigerant. •Do not operate unit in a vacuum or at negative pressure. •Do not disable low-pressure switch. In scroll compressor applications: •Dome temperatures may be hot. To prevent personal injury wear safety glasses, protective clothing, and gloves when handling refrigerant and observe the following: •Back-seating service valves are not equipped with Schrader valves. Fully back seat (counterclockwise) valve stem before removing gage-port cap. •Front-seating service valves are equipped with Schrader valves. IMPORTANT: Check factory wiring and wire connections to ensure terminations are secured properly. Check wire routing to ensure wires are not in contact with tubing, sheet metal, and so forth. Step 11—Compressor Crankcase Heater When equipped with a crankcase heater, furnish power to heater a minimum of 24 hr before starting unit. To furnish power to heater only, set thermostat to OFF and close electrical disconnect to outdoor unit. A crankcase heater is required if refrigerant tubing is longer than 50 ft. Step 12—Install Electrical Accessories Refer to the individual instructions packaged with kits or accessories when installing. Federal Regulations require that you do not vent refrigerant to atmosphere. Recover during system repair or final unit disposal. Follow these steps to properly pumpdown a system and avoid negative suction pressure. 1. Fully back seat (open) liquid-and vapor-tube service valves. 2. Unit is shipped with valve stem(s) front seated (closed) and caps installed. Replace stem caps after system is opened to refrigerant flow. Replace caps finger-tight and tighten with wrench an additional 1/12 turn. 3. Close electrical disconnects to energize system. 5 4. Set room thermostat to desired temperature. Be sure set ...

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