Carrier 38C Series Installation, Operation And Maintenance Manual

Contents

with a wet cloth, the tubing set can be brazed to the service valve using either silver bearing or non-silverbearing brazing material. Consult local code requirements. Refrigerant tubing and indoor coil are ready for leaktesting; this check should include all field and factory joints. NOTE: Unit is shipped with R-410A Holding factorycharge indicated on nameplate. Pass nitrogen or other inert gas through piping while brazing to prevent formation ofcopper oxide.Step 4 — Make Electrical ConnectionsPower Wiring — Unit is factory-wired for voltage shown on nameplate. Provide adequate, fused disconnect switchwithin sight of unit, readily accessible but out of reach of children. Provision for locking the switch open (off) isadvisable to prevent power from being turned on while unit is being serviced. Disconnect switch, fuses, and fieldwiring must be in compliance with NEC and applicable local codes. Use minimum 85 C wires for field powerconnection. Route power wires through opening in the unit side panel and connect in unit control box. Unit must begroundedRoute Ground And Power Wires — Remove access panel to gain access to unit wiring. Extend wires fromdisconnect through power wiring hole provided and into unit control box. See Electrical Data Table and unit labeldiagram for field-supplied wiring details.Connect Ground And Power Wires — Connect ground wire to ground connection in control box for safety.NOTE: Operation of unit on improper line voltage constitutes abuse and could affect unit reliability. See unit ratingplate. Do not install unit in system where voltage or phase imbalance (3 phase) may fluctuate above or belowpermissible limits. Do not install unit in system where voltage may fluctuate above or below permissible limits. Whenmaking electrical connections, provide clearance at unit for refrigerant piping connections.NOTE: Use copper wires only between disconnect switch and unit.NOTE: Install branch circuit disconnect of adequate size per NEC to handle unit starting current. Locate disconnectwithin sight from and readily accessible from unit.Connect Control Wiring — Route 24v control wires through control wiring and connect leads to control wiring. UseNo. 18 AWG color coded, insulated (35°C minimum) wire. If thermostat is located more than 100 ft from unit, asmeasured along the control voltage wires, use No. 16 AWG color coded wire to avoid excessive voltage drop.To avoid damage while brazing, service valves should be wrapped in a heat sinking material such as a wetcloth. When Brazing tubing sets to service valves, a brazing shield must be used to prevent damage to thepainted unit surface.CautionUnit cabinet must have an uninterrupted, unbroken electrical ground to minimize the possibility of personal injuryif an electrical fault should occur. This ground may consist of electrical wire connected to the unit ground lug incontrol compartment, or conduit approved for electrical ground when installed in accordance with NEC,ANSI/NFPA 70 (American National Standards Institute/National Fire Protection Association), and local electricalcodes. Failure to follow this warning could result in the installer being liable for personal injury to others.WarningUnit failure as a result of operation on improper line voltage or excessive phase imbalance constitutes abuse andmay cause damage to electrical components. Such operation will invalidate any applicable Carrier warranty.CautionThe unit cabinet must have an uninterrupted or unbroken ground. The ground may consist of electrical wire ormetal conduit when installed in accordance with existing electrical codes.WarningPage 11