Carrier 50TC-D30 User Manual

50TC*17- 30
Nominal 15 to 27.5 Tons
With Puron ® (R-410A) Refrigerant
Service and Maintenance Instructions
TABLE OF CONTENTS
TABLE OF CONTENTS 1.........................
SAFETY CONSIDERATIONS 1....................
UNIT ARRANGEMENT AND ACCESS 3...........
SUPPLY FAN (BLOWER) SECTION 4..............
STAGED AIR VOLUME (SAV) CONTROL: 2−SPEED
FAN WITH VARIABLE FREQUENCY DRIVE (VFD) 6
ADDITIONAL VFD INSTALLATION AND
TROUBLESHOOTING 7..........................
CONDENSER COIL SERVICE 8...................
EVAPORATOR COILS 10.........................
HIMIDI−MIZER DEHUMIDIFICATION SYSTEM 12
THERMOSTATIC EXPANSION VALVE (TXV) 17....
PURON (R−410A) REFRIGERANT 19.............
COOLING CHARGING CHARTS 20................
COMPRESSORS 24..............................
TROUBLESHOOTING THE COOLING SYSTEM 26..
CONVENIENCE OUTLETS 27....................
SMOKE DETECTORS 28.........................
INDICATORS 34................................
PROTECTIVE DEVICES 35.......................
PREMIERLINK™ CONTROL 36...................
RTU−OPEN CONTROL SYSTEM 38................
ECONOMI$ER SYSTEMS 40......................
PRE−START−UP/START−UP 49....................
START−UP, PREMIERLINK™ CONTROLS 50.......
START−UP, RTU−OPEN CONTROLS 51............
FASTENER TORQUE VALUES 51.................
APPENDIX I. MODEL NO. NOMENCLATURE 52...
APPENDIX II. PHYSICAL DATA 53................
APPENDIX III. FAN PERFORMANCE 61...........
APPENDIX IV. WIRING DIAGRAMS 67............
APPENDIX V. MOTORMASTER SENSOR
LOCATIONS 80.................................
UNIT START-UP CHECKLIST 81..................
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical
components. Only trained and qualified service personnel
should install, repair, or service air-conditioning
equipment. Untrained personnel can perform the basic
maintenance functions of replacing filters. Trained service
personnel should perform all other operations.
When working on air-conditioning equipment, observe
precautions in the literature, tags and labels attached to
the unit, and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations.
Have fire extinguishers available for all brazing
operations.
Follow all safety codes. Consult local building codes and
National Electrical Code (NEC) for special requirements.
Recognize safety information. This is the safety−alert
symbol . When you see this symbol on the unit and in
instructions or manuals, be aware of the potential for
physical injury hazards.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety−alert
symbol. DANGER identifies a hazardous situation which,
if not avoided, will result in death or severe personal
injury. WARNING indicates a hazardous situation which,
if not avoided, could result in death or personal injury.
CAUTION indicates a hazardous situation which, if not
avoided, could result in minor to moderate injury or
product and property damage. NOTICE is used to address
practices not related to physical injury. NOTE is used to
highlight suggestions which will result in enhanced
installation, reliability, or operation.

Carrier 50TC-D30 Specifications

General

Model	50TC-D30
Refrigerant	R-410A
Power Supply	208/230V, 1 Phase, 60Hz
Compressor Type	Scroll
HSPF	Not Applicable
Stages	Single Stage
Heating Capacity	Not Applicable
Operating Temperature (Heating)	Not Applicable
Type	Air Conditioner
Cooling Capacity	30, 000 BTU
Operating Temperature (Cooling)	Up to 125°F

Summary

SAFETY CONSIDERATIONS

UNIT ARRANGEMENT AND ACCESS

Routine Maintenance

Lists monthly/quarterly maintenance tasks for the unit.

Seasonal Maintenance

Lists maintenance tasks for the beginning of each season.

SUPPLY FAN (BLOWER) SECTION

Supply Fan Assembly

Adjusting the Belt Tension

Replacing the V-belt

Adjustable-Pitch Pulley on Motor

Changing Fan Speed

Details how to change fan speed by adjusting the motor pulley.

Aligning the Fan and Motor Pulleys

STAGED AIR VOLUME (SAV) CONTROL: 2-SPEED FAN WITH VARIABLE FREQUENCY DRIVE (VFD)

Staged Air Volume (SAV) Indoor Fan Speed System

Explains the SAV system's function with VFD for airflow control.

ADDITIONAL VFD INSTALLATION AND TROUBLESHOOTING

Refers to supplemental manuals for VFD installation and troubleshooting.

Motor

Replacing the Motor

Step-by-step instructions for replacing the belt-driven motor.

CONDENSER COIL SERVICE

ROUND TUBE PLATE FIN (RTPF) CONDENSER COIL

Recommended Condenser Coil Maintenance and Cleaning

Outlines recommended procedures for maintaining and cleaning the condenser coil.

Routine Cleaning of Coil Surfaces

Details the use of Totaline® cleaner for routine coil surface maintenance.

EVAPORATOR COILS

Routine Cleaning of Evaporator Coil Surfaces

Details routine cleaning of evaporator coils using Totaline® cleaner.

Totaline® Environmentally Sound Coil Cleaner Application Instructions

Provides step-by-step instructions for applying the coil cleaner.

Evaporator Coil Metering Devices

HIMIDI-MIZER® ADAPTIVE DEHUMIDIFICATION SYSTEM

Humidi-MiZer® Modes

Explains the different operating modes of the Humidi-MiZer system.

Normal Cooling for Units A17 – A30

Reheat1 (Subcooling Mode) for Units A17 – A30

Explains the Reheat1 (Subcooling) mode for dehumidification.

Reheat2 (Hot Gas Reheat Mode) for A17 – A30

Describes the Reheat2 (Hot Gas Reheat) mode for dehumidification without cooling.

Subcooler/Reheat Coil

Table 4 - Humidi-MiZer® Troubleshooting

Provides troubleshooting guidance for Humidi-MiZer system issues.

THERMOSTATIC EXPANSION VALVE (TXV)

TXV Operation

Replacing TXV

Provides safety precautions and steps for replacing the TXV.

Refrigerant System Pressure Access Ports

PURON® (R-410A) REFRIGERANT

Refrigerant Charge

Instructions for preparing the unit for refrigerant charge adjustment.

No Charge

Low-Charge Cooling

Explains low-charge cooling procedures using charging charts.

Using the Cooling Charging Charts

Guides on how to use the cooling charging charts for proper charge.

COOLING CHARGING CHARTS

Displays cooling charging charts for 15 Ton units.

COOLING CHARGING CHARTS (cont.)

Displays cooling charging charts for 25 Ton units.

COMPRESSORS

Filter Drier

Replacing the Filter Drier

Step-by-step guide for replacing the filter drier.

Adjusting the Condenser-Fan

TROUBLESHOOTING THE COOLING SYSTEM

Table 5 - Cooling Service Troubleshooting

Provides a table of common cooling system problems, causes, and remedies.

SMOKE DETECTORS

Sensor

FIOP Smoke Detector Wiring and Response

Explains the wiring and response of the FIOP smoke detector.

Sensor and Controller Tests

Dirty Sensor Test

Detector Cleaning

Alarm State

Describes what happens when the smoke detector enters the alarm state.

Resetting Alarm and Trouble Condition Trips

Troubleshooting

Troubleshooting guide for controller and sensor issues.

PROTECTIVE DEVICES

Compressor Protection

Covers overcurrent and overtemperature protection for compressors.

High Pressure Switch

Low Pressure Switch

Supply (Indoor) Fan Motor Protection

Details protection devices for the indoor fan motor.

Troubleshooting Supply Fan Motor Overload Trips

Guidance for troubleshooting supply fan motor overload trips.

PREMIERLINK™ CONTROL

Fig. 43 – PremierLink™ Controller

RTU-OPEN CONTROL SYSTEM

Sensory/Accessory Installation

Additional RTU-OPEN Installation and Troubleshooting

Refers to manuals for RTU-OPEN installation and troubleshooting.

Fig. 44 - RTU-OPEN Control Module

ECONOMISER SYSTEMS

Fig. 45 - EconoMi$er IV Component Locations

Fig. 46 - EconoMi$er IV Wiring

Fig. 47 - EconoMi$er2 with 4 to 20 mA Control Wiring

EconoMi$er IV Standard Sensors

EconoMi$er IV Control Modes

Explains different control modes for the EconoMi$er IV.

Outdoor Dry Bulb Changeover

Fig. 50 - EconoMi$er IV Controller Potentiometer and LED Locations

Fig. 51 - Outside Air Temperature Changeover Setpoints

Differential Dry Bulb Control

Outdoor Enthalpy Changeover

Fig. 55 - EconoMi$er IV Control

Differential Enthalpy Control

Control mode using differential enthalpy sensors.

Indoor Air Quality (IAQ) Sensor Input

Input for IAQ sensor for demand control ventilation.

Minimum Position Control

Demand Control Ventilation (DCV)

Using EconoMi$er IV for demand controlled ventilation.

CO2 Sensor Configuration

Differential Enthalpy

Single Enthalpy

DCV (Demand Controlled Ventilation) and Power Exhaust

DCV Minimum and Maximum Position

Supply-Air Sensor Input

EconoMi$er IV Troubleshooting Completion

PRE-START-UP/START-UP

START-UP, GENERAL

General procedures for unit start-up and preparation.

Unit Preparation

Steps for preparing the unit for start-up according to instructions.

Additional Installation/Inspection

Compressor Rotation

How to determine and correct compressor rotation direction.

Cooling

START-UP, PREMIERLINK™ CONTROLS

Perform System Check-Out

START-UP, RTU-OPEN CONTROLS

APPENDIX I. MODEL NUMBER NOMENCLATURE

APPENDIX III. FAN PERFORMANCE

Table 14-50TC*D17 VERTICAL SUPPLY / RETURN

Fan performance data for 15 Ton vertical units.

Table 15-50TC*D20 VERTICAL SUPPLY / RETURN

Fan performance data for 17.5 Ton vertical units.

Table 17-50TC*D28 VERTICAL SUPPLY / RETURN

Fan performance data for 25 Ton vertical units.

Table 18-50TC-D30 VERTICAL SUPPLY / RETURN

Fan performance data for 27.5 Ton vertical units.

Table 19-50TC*D18 HORIZONTAL SUPPLY / RETURN

Fan performance data for 15 Ton horizontal units.

Table 20-50TC*D21 HORIZONTAL SUPPLY / RETURN

Fan performance data for 17.5 Ton horizontal units.

Table 22-50TC*D29 HORIZONTAL SUPPLY / RETURN

Fan performance data for 25 Ton horizontal units.

Table 23 - Pulley Adjustment – Vertical

Table 24 - Pulley Adjustment - Horizontal

APPENDIX IV. WIRING DIAGRAMS

Table 25 - Wiring Diagrams

Table listing wiring diagram part numbers by unit size and options.

Fig. 57 - 50TC D17 – D28 Control Diagram – 208/230–3–60; 460/575–3–60

Control diagram for 208/230V & 460/575V units.

Fig. 58 – 50TC D30 Control Diagram 208/230–3–60

Control diagram for 208/230V 50TC D30 unit.

Fig. 59 – 50TC D30 Control Diagram – 460/575–3–60

Control diagram for 460/575V 50TC D30 unit.

Fig. 60 – 50TC D17 – D30 Power Diagram – 208/230–3–60

Power diagram for 208/230V units.

Fig. 61 – 50TC D17 – D30 Power Diagram 460/575–3–60

Power diagram for 460/575V units.

Fig. 62 – 50TC D17 – D30 Control Diagram 208/230–3–60; 460/575–3–60 with Humidi-MiZer®

Control diagram with Humidi-MiZer for 208/230V and 460/575V units.

Fig. 63 – 50TC D17 – D30 Power Diagram 208/230–3–60 with Humidi-MiZer®

Power diagram with Humidi-MiZer for 208/230V units.

Fig. 64 – 50TC D17 – D30 Power Diagram 460–3–60 with Humidi-MiZer®

Power diagram with Humidi-MiZer for 460V units.

Fig. 65 – 50TC D17 – D30 Power Diagram 575–3–60 with Humidi-MiZer®

Power diagram with Humidi-MiZer for 575V units.

Fig. 66 – 50TC – PremierLink™ System Control Wiring Diagram

Wiring diagram for the PremierLink system control.

Fig. 67 – 50TC – RTU-OPEN Wiring Diagram

Wiring diagram for the RTU-OPEN system.

Fig. 68 – 50TC – SAV – VFD System Control Wiring Diagram

Wiring diagram for the SAV-VFD system control.

UNIT START-UP CHECKLIST

II. PRE-START-UP

Checklist of pre-start-up inspections and verifications.

III. START-UP

Checklist for electrical, temperature, pressure, and general start-up checks.