Carrier 50FC A05 Series - User Manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500204-01 Printed in U.S.A. Form 50FC-4-7-01SM Rev. A Pg 1 8-19 Replaces: New
Service and Maintenance Instructions
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 2
UNIT ARRANGEMENT AND ACCESS . . . . . . . . . . . . 3
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 3
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SUPPLY FAN (BLOWER) SECTION . . . . . . . . . . . . . . 4
Supply Fan (Direct-Drive) . . . . . . . . . . . . . . . . . . . . . . 4
Staged Air Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
COOLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Condenser Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Condenser Coil Maintenance and Cleaning
Recommendation . . . . . . . . . . . . . . . . . . . . . . . . . 10
Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Evaporator Coil Metering Devices . . . . . . . . . . . . . . 12
THERMOSTATIC EXPANSION VALVE (TXV) . . . . . 12
TXV Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Replacing TXV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Refrigerant System Pressure Access Ports . . . . . . 13
PURON (R-410A) REFRIGERANT . . . . . . . . . . . . . . 14
Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . 14
COOLING CHARGING CHARTS . . . . . . . . . . . . . . . . 14
COMPRESSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Replacing Compressor . . . . . . . . . . . . . . . . . . . . . . . 16
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . . 17
Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Condenser-Fan Adjustment . . . . . . . . . . . . . . . . . . . 17
Troubleshooting Cooling System . . . . . . . . . . . . . . 18
CONVENIENCE OUTLETS . . . . . . . . . . . . . . . . . . . . 19
Convenience Outlets . . . . . . . . . . . . . . . . . . . . . . . . 19
Installing Weatherproof Cover . . . . . . . . . . . . . . . . . 19
Non-Powered Type . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Unit-Powered Type . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Duty Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Fuse on Powered Type . . . . . . . . . . . . . . . . . . . . . . . 20
ELECTRIC HEATERS . . . . . . . . . . . . . . . . . . . . . . . . 20
Completing Heater Installation . . . . . . . . . . . . . . . . 21
SMOKE DETECTORS . . . . . . . . . . . . . . . . . . . . . . . . 22
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Smoke Detector Sensor . . . . . . . . . . . . . . . . . . . . . . 22
Smoke Detector Locations . . . . . . . . . . . . . . . . . . . . 22
Completing Installation of Return Air Smoke
Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
FIOP Smoke Detector Wiring and Response . . . . . 24
SENSOR AND CONTROLLER TESTS . . . . . . . . . . . 25
Sensor Alarm Test . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Controller Alarm Test . . . . . . . . . . . . . . . . . . . . . . . . 25
Dirty Controller Test . . . . . . . . . . . . . . . . . . . . . . . . .25
Dirty Sensor Test . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Changing the Dirt Sensor Test . . . . . . . . . . . . . . . . .25
Remote Station Test . . . . . . . . . . . . . . . . . . . . . . . . .25
SD-TRK4 Remote Alarm Test Procedure . . . . . . . . .25
Remote Test/Reset Station Dirty Sensor Test . . . . .26
Dirty Sensor Test Using an SD-TRK4 . . . . . . . . . . .26
Detector Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
PROTECTIVE DEVICES . . . . . . . . . . . . . . . . . . . . . . .27
Compressor Protection . . . . . . . . . . . . . . . . . . . . . . .27
Relief Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Control Circuit, 24-V . . . . . . . . . . . . . . . . . . . . . . . . .28
SYSTEMVU CONTROL SYSTEM . . . . . . . . . . . . . . . .28
SystemVu Interface . . . . . . . . . . . . . . . . . . . . . . . . . .28
Additional SystemVu Installation and
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . .28
RTU OPEN CONTROL SYSTEM . . . . . . . . . . . . . . . .29
Sensory/Accessory Installation . . . . . . . . . . . . . . . .29
Additional RTU Open Installation and
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . .30
ECONOMIZER SYSTEMS . . . . . . . . . . . . . . . . . . . . .30
EconoMi$er2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
EconoMi$er IV (Field-Installed Accessory) . . . . . . .32
Economi$er X (Factory Option) . . . . . . . . . . . . . . . .39
PRE-START-UP/START-UP . . . . . . . . . . . . . . . . . . . .52
START-UP, GENERAL . . . . . . . . . . . . . . . . . . . . . . . .52
Unit Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Additional Installation/Inspection . . . . . . . . . . . . . .52
Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Outdoor-Air Inlet Screens . . . . . . . . . . . . . . . . . . . . .52
Compressor Mounting . . . . . . . . . . . . . . . . . . . . . . . .52
Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Refrigerant Service Ports . . . . . . . . . . . . . . . . . . . . .52
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . .53
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Ventilation (Continuous Fan) . . . . . . . . . . . . . . . . . .53
FASTENER TORQUE VALUES . . . . . . . . . . . . . . . . .53
START-UP, RTU OPEN CONTROLS . . . . . . . . . . . . .53
START-UP, SYSTEMVU CONTROLS . . . . . . . . . . . .53
APPENDIX A — MODEL NUMBER
NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . .54
APPENDIX B — PHYSICAL DATA . . . . . . . . . . . . . . .55
APPENDIX C — FAN PERFORMANCE . . . . . . . . . . .58
APPENDIX D — WIRING DIAGRAMS . . . . . . . . . . . .87
APPENDIX E — LOW AMBIENT CONTROL SENSOR
LOCATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . .CL-1
50FC04-07
Single Package Rooftop Electric Cooling Unit
with Puron
®
(R-410A) Refrigerant
3 to 6 Nominal Tons

Carrier 50FC A05 Series Specifications

General

Series	50FC A05
Refrigerant Type	R-410A
Voltage	208/230V
Phase	1
Air Flow (Indoor)	2000 CFM
Type	Air Conditioner
Cooling Capacity	5 Tons

Summary

Service and Maintenance Instructions

SAFETY CONSIDERATIONS

Essential safety warnings and precautions for personnel.

COOLING

Procedures and information related to the cooling system operation.

THERMOSTATIC EXPANSION VALVE (TXV)

Explains the TXV operation and replacement procedures.

COMPRESSOR

Information on compressor lubrication, replacement, and rotation.

Troubleshooting Cooling System

Provides a table listing symptoms, causes, and solutions for cooling system issues.

SENSOR AND CONTROLLER TESTS

Procedures for testing sensor and controller functions.

PROTECTIVE DEVICES

Compressor Protection

SystemVu Control System

RTU OPEN CONTROL SYSTEM

ECONOMIZER SYSTEMS

Enthalpy Settings

START-UP CHECKLIST

A comprehensive checklist for unit start-up procedures.

II. PRE-START-UP

III. START-UP

IV. HUMIDI-MIZER SYSTEM START-UP