Carrier Performance 38QRR Installation Instructions Manual

Also see for 38QRR: Installation instructions Product data Owner's information manual Installation instructions Installation instructions

Contents

4CAUTION!UNIT DAMAGE HAZARDFailure to follow this caution may result in equipmentdamage or improper operation.Unit failure as a result of operation on improper line voltageor excessive phase imbalance constitutes abuse and maycause damage to electrical components. Such operationwould void any applicable Carrier warranty.! WARNINGELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injury ordeath.Before performing service or maintenance, be sure indoor unitmain power switch is turned OFF and indoor blower hasstopped.Power WiringUnit is factory wired for voltage shown on nameplate. Provideadequate, fused disconnect switch within sight from unit, readilyaccessible, but out of reach of children. Provision for locking theswitch open (off) is advisable to prevent power from being turnedon while unit is being serviced.Disconnect switch, fuses, and field wiring must comply with theNEC and local code requirements. Use copper wire only betweenthe disconnect switch and unit. Use minimum 75 C wire for thefield power connection.Route power wires through the opening in unit side panel andconnect in the unit control box as shown on the unit label diagramand Fig. 5. Unit must be grounded.LEGENDNEC — National Electrical CodeTB — Terminal BoardTB ConnectionsField WiringFactory Wiring— —A07428Fig. 5 --- Line Power ConnectionsControl Circuit WiringControl voltage is 24 v (40 va minimum). See Fig. 6 and unit labeldiagram for field--supplied wiring details. Route control wirethrough opening in unit side panel to connection in unit controlbox.A07429Fig. 6 --- 38QRR Typical Control Circuit ConnectionsNOTE: Use No. 18 AWG color--coded, insulated (35_Cminimum) wire. If thermostat is located more than 100 ft. (30.5 m)from unit, as measured along the control voltage wires, use No. 16AWG color--coded wire to avoid excessive voltage drop.NOTE: All wiring must conform to NEC and local codes.NOTE: Operating unit on improper line voltage constitutes abuseand could affect Carrier warranty. See Product Data. Do not installunit in a system where voltage may fluctuate above or belowpermissible limits.Refer to the Product Data for recommended fuse sizes. Whenmaking electrical connections, provide clearance at the unit forrefrigerant piping connections.NOTE: The 38QRR units use the control transformer suppliedwith the matched indoor unit.START--UPPRELIMINARY CHECKS1. Check that all internal wiring connections are tight and thatall barriers, covers, and panels are in place.2. Field electrical power source must agree with unit name-plate rating.3. All service valves must be open.4. Belly--band crankcase heater must be tight on compressorcrankcase for those units with belly--band heaters.EVACUATE AND DEHYDRATEField piping and fan coil must be evacuated and dehydrated.CHARGE SYSTEMRelease charge into system by opening (backseating) liquid andsuction line service valves. Outdoor unit is charged for 15 ft (4.6m) of 3/8--in. liquid line.TO START UNITBe sure that the field disconnect is closed. Set room thermostatbelow ambient temperature. Operate unit for 15 minutes, thencheck system refrigerant charge. See Refrigerant Charging section.NOTE: When using in conjunction with 40QA fan coils, refer tostart--up instructions included with fan coil for correct start--upprocedures.38QRR