Carrier WeatherMaker 48TC Series - Page 47

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Fig. 62 — RTU Open Overlay for Economizer Wiring

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Table of Contents1
Safety Considerations2
Unit Arrangement and Access3
General3
Routine Maintenance3
Seasonal Maintenance3
Supply Fan (Blower) Section4
Supply Fan Assembly4
Adjustable-Pitch Pulley on Motor5
Bearings5
Staged Air Volume (Sav) Control: 2-Speed Fan with Variable Frequency Drive (Vfd)6
Staged Air Volume (SAV) Indoor Fan Speed6
System6
Identifying Factory Option6
Unit Installation with SAV Option6
Additional Vfd Installation and6
Troubleshooting6
Motor6
Replacing the Motor6
Changing Fan Wheel Speed by Changing Pulleys7
Condenser Coil Service7
Round Tube Plate Fin (RTPF) Condenser Coil7
Evaporator Coils8
Coil Maintenance and Cleaning Recommendation9
Removing Surface Loaded Fibers9
Periodic Clean Water Rinse9
Routine Cleaning of Evaporator Coil Surfaces9
Evaporator Coil Metering Devices9
Refrigerant System Pressure Access Ports10
Humidi-Mizer® Adaptive Dehumidification11
System11
Humidi-Mizer Modes11
Thermostatic Expansion Valve (Txv)15
TXV Operation15
Refrigerant System Pressure Access Ports17
Puron® (R-410A) Refrigerant17
Refrigerant Charge17
Using the Cooling Charging Charts17
Cooling Charging Charts18
Compressors22
Lubrication22
Filter Drier22
Troubleshooting the Cooling System23
Convenience Outlets24
Non-Powered Type24
Unit-Powered Type24
Wet in Use Convenience Outlet Cover24
GFCI Maintenance24
Fuse on Powered Type25
Using Unit-Mounted Convenience Outlets25
Installing a Weatherproof Cover25
Smoke Detectors25
System25
Controller25
Sensor26
Smoke Detector Locations26
FIOP Smoke Detector Wiring and Response27
Sensor and Controller Tests28
Detector Cleaning29
Indicators30
Normal State30
Alarm State30
Resetting Alarm and Trouble Condition Trips31
Troubleshooting31
Protective Devices31
Compressor Protection31
Control Circuit, 24V32
Premierlink™ Control32
RTU Open Control System32
Gas Heating System32
General32
Fuel Types and Pressures33
Flue Gas Passageways33
Combustion-Air Blower34
Burners and Igniters34
Gas Valve36
Burner Ignition37
Orifice Replacement37
Troubleshooting Heating System44
Economi$Er Systems46
Economi$Er IV Standard Sensors50
Economi$Er® X (Factory Option)55
Pre-Start-Up/Start-Up69
Start-Up, General69
Unit Preparation69
Additional Installation/Inspection69
Gas Piping69
Return-Air Filters70
Outdoor-Air Inlet Screens70
Compressor Mounting70
Internal Wiring70
Refrigerant Service Ports70
Compressor Rotation70
Cooling70
Main Burners70
Heating70
Ventilation (Continuous Fan)71
Start-Up, Premierlink Controls71
Start-Up, Rtu-Open Controls71
Fastener Torque Values71
Nomenclature72
Appendix B - Physical Data74
Appendix C - Fan Performance85
Appendix D - Wiring Diagrams95
Appendix E - Motormaster Sensor108
Locations108
Start-Up Checklist111

Carrier WeatherMaker 48TC Series - Page 47

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