Carrier 50TCA04-A07 Service And Maintenance Instructions

Also see for 50TCA04: Installation instructions

402. Set the Enthalpy potentiometer to A. The Free CoolLED turns on. The actuator should drive to between20 and 80% open.3. Remove the 5.6 kilo--ohm resistor and jumper T toT1. The actuator should drive fully open.4. Remove the jumper across T and T1. The actuatorshould drive fully closed.5. Return EconoMi$er IV settings and wiring to normalafter completing troubleshooting.EconoMi$er IV Troubleshooting CompletionThis procedure is used to return the EconoMi$er IV tooperation. No troubleshooting or testing is done byperforming the following procedure.1. Disconnect power at TR and TR1.2. Set enthalpy potentiometer to previous setting.3. Set DCV maximum position potentiometer to previ-ous setting.4. Set minimum position, DCV setpoint, and exhaust po-tentiometers to previous settings.5. Remove 620--ohm resistor from terminals SR and +.6. Remove 1.2 kilo--ohm checkout resistor from termin-als SO and +. If used, reconnect sensor from termin-als SO and +.7. Remove jumper from TR to N.8. Remove jumper from TR to 1.9. Remove 5.6 kilo--ohm resistor from T and T1. Recon-nect wires at T and T1.10. Remove jumper from P to P1. Reconnect device at Pand P1.11. Apply power (24 vac) to terminals TR and TR1.WIRING DIAGRAMSSee Fig. 65--66 for typical wiring diagrams.PRE--START--UPPERSONAL INJURY HAZARDFailure to follow this warning could result in personalinjury or death.1. Follow recognized safety practices and wear pro-tective goggles when checking or servicing refri-gerant system.2. Do not operate compressor or provide any electricpower to unit unless compressor terminal cover isin place and secured.3. Do not remove compressor terminal cover untilall electrical sources are disconnected.4. Relieve all pressure from system before touchingor disturbing anything inside terminal box if refri-gerant leak is suspected around compressor ter-minals.5. Never attempt to repair soldered connection whilerefrigerant system is under pressure.6. Do not use torch to remove any component. Sys-tem contains oil and refrigerant under pressure.To remove a component, wear protective gogglesand proceed as follows:a. Shut off electrical power to unit.b. Recover refrigerant to relieve all pressure fromsystem using both high--pressure and lowpressure ports.c. Cut component connection tubing with tubingcutter and remove component from unit.d. Carefully unsweat remaining tubing stubswhen necessary. Oil can ignite when exposedto torch flame.! WARNINGProceed as follows to inspect and prepare the unit forinitial start--up:1. Remove all access panels.2. Read and follow instructions on all WARNING,CAUTION, and INFORMATION labels attached to,or shipped with, unit.3. Make the following inspections:a. Inspect for shipping and handling damages suchas broken lines, loose parts, or disconnectedwires, etc.b. Inspect for oil at all refrigerant tubing connec-tions and on unit base. Detecting oil generallyindicates a refrigerant leak. Leak--test all refri-gerant tubing connections using electronic leakdetector, halide torch, or liquid--soap solution.c. Inspect all field--wiring and factory--wiring con-nections. Be sure that connections are completedand tight. Be sure that wires are not in contactwith refrigerant tubing or sharp edges.d. Inspect coil fins. If damaged during shipping andhandling, carefully straighten fins with a fincomb.50TC