Controls, Start---Up, Operation and Troubleshooting

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Controls, Start---Up, Operation and Troubleshooting 48/50LC 04---06 Single Package Rooftop Units with ComfortLink Controls Version 1.X and PURONr (R---410A) Refrigerant Controls, Start---Up, Operation and Troubleshooting IMPORTANT: This literature covers 48/50LC 04--06 models with Relative Humidity Sensor Control...................... 9 ComfortLink Software version 1.x. CCN Communication............................... 9 TABLE OF CONTENTS Accessories....................................... 9 Page Programming Operating Schedules..................... 9 SAFETY CONSIDERATIONS......................... 2 SERVICE TEST.................................... 11 GENERAL......................................... 3 Independent Outputs............................... 11 BASIC CONTROL USAGE........................... 3 Fan Test......................................... 11 ComfortLink Control................................ 3 Cooling Test..................................... 11 Scrolling Marquee.................................. 3 Heating Test...................................... 11 Accessory Navigator Display.......................... 4 THIRD PARTY CONTROL.......................... 11 Operation......................................... 4 Cooling/Heating Control............................ 11 System Pilott and Touch Pilot Devices................. 4 Dehumidification Control........................... 11 CCN Tables and Display............................. 4 Remote Occupancy................................ 12 Conventions Used in This Manual...................... 6 Fire Shutdown.................................... 12 START--UP......................................... 6 Alarm Output..................................... 12 Unit Preparation.................................... 6 Economizer Damper Control......................... 12 Compressor Mounting............................... 6 CONTROLS OPERATION........................... 12 Refrigerant Service Ports............................. 6 Display Configuration.............................. 12 Crankcase Heater................................... 6 Unit Configuration................................. 12 Compressor Rotation................................ 6 Modes.......................................... 13 Power Supply..................................... 6 General Operation................................. 13 Internal Wiring..................................... 6 Temperature Setpoint Determination................... 14 Evaporator Fan.................................... 6 Occupancy Determination........................... 14 Condenser Fans and Motors........................... 7 Indoor Fan Operation............................... 14 Return--Air Filters.................................. 7 Cooling Operation................................. 15 Outdoor--Air Inlet Screens............................ 7 Heating Operation................................. 18 Accessory Installation............................... 7 Economizer...................................... 19 Orifice Change (48LC).............................. 7 Air--Side Economizer High Limit Switches Control....... 22 Gas Heat (48LC)................................... 8 Indoor Air Quality (IAQ)............................ 23 CONTROLS QUICK SET--UP......................... 8 Temperature Compensated Start....................... 25 Control Set Point and Confirmation Log................. 8 Carrier Comfort Network (CCN)R Configuration......... 25 Thermostat Control................................. 8 Demand Limit.................................... 26 Space Temperature Sensor Control -- Direct Wired Linkage......................................... 26 (T--55 or T--56 or T--59)............................. 8 Alarm Handling................................... 26 T--58 Communicating Room Sensor.................... 8 TROUBLESHOOTING.............................. 27 CCN Linkage Control............................... 8 Complete Unit Stoppage............................ 27 System Pilott --Communication Space Sensor........... 8 Restart Procedure.................................. 27 Thermidistat Control................................ 8 Alarms and Alerts................................. 27 Space Humidistat Control............................ 9 Control Module Communication...................... 32 Communication Failures............................ 32 SAFETY CONSIDERATIONS Cooling Troubleshooting............................ 33 Installation and servicing of air-conditioning equipment can be Economizer Troubleshooting......................... 34 hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, repair, or Title 24 FDD Status Points.......................... 34 service air-conditioning equipment. Untrained personnel can Heating Troubleshooting............................ 36 perform the basic maintenance functions of replacing filters. Phase Loss Protection.............................. 39 Trained service personnel should perform all other operations. Thermistor Troubleshooting......................... 39 When working on air-conditioning equipment, observe precautions in the literature, tags and labels attached to the unit, and other Transducer Troubleshooting......................... 40 safety precautions that may apply. Follow all safety codes. Wear Forcing Inputs and Outputs.......................... 40 safety glasses and work gloves. Use quenching cloth for unbrazing MAJOR SYSTEM COMPONENTS.................... 43 operations. Have fire extinguishers available for all brazing operations. General......................................... 43 Follow all safety codes. Wear safety glasses and work gloves. Have Main Base Board (MBB)............................ 49 fire extinguisher available. Read these instructions thoroughly and Economizer Control Board (ECB)..................... 51 follow all warnings or cautions attached to the unit. Consult local Integrated Gas Control (IGC) Board................... 53 building codes and National Electrical Code (NEC) for special requirements. Low Voltage Terminal Board......................... 54 Communication Interface Board (CIB)................. 54 Recognize safety information. This is the safety--alert symbol . When you see this symbol on the unit and in instructions or Central Terminal Board (CTB)........................ 54 manuals, be alert to the potential for personal injury. 48/50LC Variable Frequency Drive (VFD)...................... 56 Understand the signal words DANGER, WARNING, and VFD Diagnostics (with Keypad)...................... 58 CAUTION. These words are used with the safety--alert symbol. DANGER identifies the most serious hazards which will result in Scrolling Marquee Display.......................... 61 severe personal injury or death. WARNING signifies a hazard Accessory Navigatort Display....................... 61 which could result in personal injury or death. CAUTION is used Carrier Comfort Network (CCN)R Interface............. 61 to identify unsafe practices which may result in minor personal Protective Devices................................. 63 injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or Field--Installed Accessories.......................... 63 operation. APPENDIX -- LOCAL DISPLAY AND CCN TABLES..................................... 66 ! CONTROL SET POINT AND CONFIGURATION LOG.... 80 WARNING UNIT START--UP CHECKLIST....................... 87 ELECTRICAL SHOCK HAZARD Failure to follow this warning could cause personal injury or death. Before performing service or maintenance operations on unit, turn off main power switch to unit and install lockout tag. Ensure electrical service to rooftop unit agrees with voltage and amperage listed on the unit rating plate. ! CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may cause equipment damage. This unit uses a microprocessor--based electronic control system. Do not use jumpers or other tools to short out components or to bypass or otherwise depart from recommended procedures. Any short--to--ground of the control board or accompanying wiring may destroy the electronic modules or electrical components. 2 The ComfortLink control system is easy to access through the use ! of a unit-mounted display module. There is no need to bring a WARNING separate computer to this unit for start-up. Access to control menus FIRE, EXPLOSION HAZARD is simplified by the ability to quickly select from 11 menus. A scrolling readout provides detailed explanations of control Failure to follow this warning could result in personal information. Only four, large, easy-to-use buttons are required to injury, death and/or property damage. maneuver through the entire controls menu. The display readout is Improper installation, adjustment, alteration, service, or designed to be visible even in bright sunlight. maintenance can cause property damage, personal injury, or For added service flexibility, an accessory hand-held Navigator loss of life. Refer to the User’s Information Manual module is also available. This portable device has an extended provided with this unit for more details. communication cable that can be plugged into the unit’s Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. What communication network at the main control box. The Navigator to do if you smell gas: display provides the same menu structure, control access and 1. DO NOT try to light any appliance. display data as is available at the unit-mounted Scrolling
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