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Carrier 50LC 12 - User Manual

Carrier 50LC 12
164 pages
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1
Controls, Start-- Up, Operation
and Troubleshooting
48/50LC 04---26
Single P ackage Roofto p Units
with SystemV u™ Controls Version 2.X
and Puronr ( R---410A) Refrig er ant
C150173
IMPORTANT: This literature covers 48/50LC 04--26 models with SystemV u controls version 2.X (factory--installed option).
TABLE OF CONTENTS
Page
SAFETY CONSIDERATIONS 2.........................
GENERAL 3.........................................
Conventions Used in This Manual 3......................
BASIC CONTROL USAGE 3...........................
SystemVu Control 3..................................
SystemV u Interface 3.................................
Accessory Navigatort Display 4........................
System Pilott andTouchPilott Devices 5................
CCN Tables and Display 5.............................
START --UP 6.........................................
Unit Preparation 6....................................
Refrigerant Service Ports 6.............................
Crankcase Heater 6...................................
Compressor Rotation 6................................
Power Supply 6.....................................
Internal Wiring 6.....................................
Evaporator Fan 6....................................
Condenser Fans and Motors 7...........................
Return--Air Filters 7..................................
Outdoor--Air Inlet Screens 7............................
Accessory Installation 7...............................
Gas Heat (48LC) 8...................................
CONTROLS QUICK SET--UP 9.........................
Contro l Set Point and Confirmation Log 9.................
Initial Startup 9......................................
Thermostat Control 9.................................
Space Temperature Sensor Control -- Direct Wired
(T--55 or T-- 56 or T-- 59) 9.............................
Space Humidistat Control 9............................
Relative Humidity Sensor Control 9......................
CCN Communication 10..............................
CCN Linkage Control 10..............................
System Pilott -- Communication Space Sensor 10..........
Accessories 10......................................

Table of Contents

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Carrier 50LC 12 Specifications

General IconGeneral
Net Weight (Outdoor Unit)32 kg
TypeSplit Type
Cooling Capacity12000 BTU/h
Power Supply220-240V, 50Hz
RefrigerantR410A

Summary

Controls, Start-Up, Operation and Troubleshooting

Safety Considerations

Important precautions for installation and servicing of HVAC equipment.

Electrical Shock Hazard

Warning about the dangers of electrical shock during service operations.

SystemVu Interface Operation

Details on navigating and using the SystemVu controller's interface.

Basic Control Usage

Explains the SystemVu control system and its interface for unit management.

Accessory Navigator Display Operation

Instructions for operating the hand-held Navigator accessory display.

START-UP Procedures

Unit Preparation and Electrical Checks

Steps for preparing the unit, checking electrical connections, and power supply.

Controls Quick Set-Up

Initial Startup and Configuration Log

Guidance on initial unit startup, network setup, and logging configuration changes.

Network Setup

Configuration steps for network settings and communication protocols.

Quick Setup Menu Items

Common configurations for accessories and controls during startup.

System Auto Test

Procedure for enabling and executing the System Auto Test.

Programming Operating Schedules

Setting up occupancy schedules with eight distinct periods and day configurations.

SERVICE TEST Functions

Automatic Test Procedures

Cooling;Heating Control Logic

How thermostats and unit control types manage cooling and heating stages.

Dehumidification Control Logic

Control logic for Humidi-MiZer system using humidistat or humidity sensor inputs.

SystemVu Controller Configuration Settings

Unit Configuration Parameters

Key parameters for configuring factory options and field accessories.

Startup and Control Type Settings

Configuring startup delay, unit control type, and thermostat type.

General Operation and Demand Determination

Demand Determination Logic

How the control determines unit demand based on various factors and priorities.

Temperature Demand Parameters

Defining cooling and heating demand based on temperature differences and trends.

Thermostat Demand Logic

Mapping thermostat inputs to system demand levels for cooling and heating.

Setpoint Determination

How effective setpoints are determined based on occupancy and slider adjustments.

Space Sensor Demand Logic

Determining system demand based on space temperature and setpoints.

RAT Demand Logic

Using return air temperature for demand determination.

Occupancy Determination Logic

Factors affecting occupancy and their priority levels for unit operation.

Humidity and Indoor Fan Operation

Humidity Demand Control

Logic for demanding dehumidification based on humidistat or humidity sensor inputs.

Indoor Fan Operation

Explanation of the Staged Air Volume (SAV) method for supply fan speed control using VFDs.

Indoor Fan Speed Configurations

Cooling Operation Modes

Overview of different cooling sub-modes and entry conditions.

Cooling Staging Control Logic

How the system determines and requests cooling stages based on demand and trends.

Compressor Control

Outdoor Fan Control

Control logic for outdoor fans, including multi-speed motors and low ambient operation.

Low Ambient Operation

Optional Humidi-MiZerR Dehumidification System

Information on the Humidi-MiZer system's improved dehumidification modes.

Dehumidification Demand Logic

Determining dehumidification demand based on humidistat or humidity sensor inputs.

Humidi-MiZer System Modes

Available modes for Humidi-MiZer units: Dehumidification and Dehum/Mech Cooling.

Dehumidification (Hot Gas Reheat Mode)

Reheat Control Logic

Unit operation in normal cooling mode versus dehumidification-only mode.

Reheat Mode Diagnostic Help

Indoor Fan Based Dehumidification

Improved dehumidification using fan-based methods (Max Comfort, Max Dehum).

Heating Operation Modes

Overview of heating modes: HEATING, HEATING PREVENTED, SHUTTING HEAT OFF.

Heating Operation

Heating Staging Control Logic

Determining and requesting heating stages based on demand and unit resources.

Adaptive Control Staging

Staging control that uses stage timers and supply air trend for heating.

Traditional Thermostat Control Staging

Staging control that directly follows thermostat inputs for heating.

Heat Relay Control

Responsibility for energizing or de-energizing heat stage relays based on staging control.

Integrated Gas Controller (IGC)

Control logic for gas heat module start-up, monitoring safety switches.

Supply Air Tempering

Economizer Operation

Enabling and configuring the economizer for ventilation and cooling.

Minimum Ventilation

Economizer damper position logic for maintaining constant airflow during ventilation.

Free Cooling

Dry Bulb Lockout Conditions

Conditions that trigger dry bulb lockout, disabling free cooling.

Enthalpy Lockout Conditions

Conditions that trigger enthalpy lockout, disabling free cooling.

Unoccupied Free Cooling Lockout

Conditions that trigger lockout during unoccupied periods, disabling free cooling.

Unoccupied Free Cooling

Power Exhaust Function

Function of power exhaust to assist building exhaust air, controlled by relays.

IAQ (Analog Input) Configuration

Temperature Compensated Start

Algorithm to calculate bias time for optimal start, used for ASHRAE 90.1 compliance.

Carrier Comfort Network (CCN) Operation

BACnet Network Operation

Configuring the SystemVu controller for BACnet communication.

Alarm Handling

Understanding system alerts and faults, indicated by status lights and terminal outputs.

Diagnostic Alarm Codes and Possible Causes

Troubleshooting specific alarm codes, their causes, and actions.

Control Module Communication

Communication Failures

Troubleshooting communication issues by measuring resistance on control boards.

Cooling Troubleshooting

Humidi-MiZer System Troubleshooting

Activating Humidi-MiZer System Operation After Field Replacement of a SystemVut Controller

Procedure for field-configuring a replacement controller for Humidi-MiZer system option.

Economizer Troubleshooting

Heating Troubleshooting

Gas Heat (48 LC Units) Troubleshooting

Service analysis for gas heating issues, checking IGC board and alarm codes.

Electric Heat (50 LC Units) Troubleshooting

Service analysis for electric heating issues.

APPENDIX A: SystemVu Controller Display

Run Status Main Menu Layout

Layout of the Run Status menu, detailing items, expansion, range, units, and points.

Run Status Main Menu Layout (cont)

Continuation of the Run Status menu layout, covering COOL, HEAT, VENTILATION, and INDOOR FAN sections.

Settings Main Menu Layout

Layout of the Settings menu, covering SPACE SET POINTS and TEMP DEMAND CONFIG.

Settings Main Menu Layout (cont)

Continuation of Settings menu layout, covering QUICK SETUP CONFIG.

Service Main Menu Layout

Layout of the Service menu, including UNIT TESTS and FAN TESTS.

Service Main Menu Layout (cont)

Continuation of Service menu layout, covering HARDWARE INPUTS and CALIBRATION.

Inputs Main Menu Layout

Layout of the Inputs menu, covering TEMPERATURES, PRESSURES, THERMOSTAT, and SWITCH INPUTS.

Inputs Main Menu Layout (cont)

Continuation of Inputs menu layout, covering ANALOG INPUTS and GENERAL INPUTS.

Outputs Main Menu Layout

Layout of the Outputs menu, covering GENERAL OUTPUTS, COOLING OUTPUTS, and HEATING OUTPUTS.

Alerts;Faults Main Menu Layout

Layout for viewing and resetting active alerts and faults.

APPENDIX B: SystemVut Controller Display

MODE - RUN STATUS

Display of operating modes including COOL, HEAT, VENT, and TEST.

MODE - SERVICE TEST

Display menu for accessing various service test functions for unit components.

APPENDIX C: Navigatort Display

MODE - INPUTS

Display of input status for thermostats, switches, analog sensors, and network values.

MODE - SETPOINTS

Display of setpoints for cooling, heating, and humidity, including offsets and gaps.

APPENDIX C: Navigatort Display

MODE - CONFIGURATIONS

Display of configuration settings for General Unit, DI Config, and Analog Input.

MODE - CONFIGURATIONS (cont)

Continuation of Configuration settings for HEATING, INDOOR FAN, and VFD parameters.

APPENDIX D: SystemVut Controller CCN Tables

Configuration Tables

Tables for configuring network settings like BAS Protocol Select and BACnet parameters.

MODE - OPERATING MODES

CCN table detailing operating modes like COOL, HEAT, VENT, and TEST.

Maintenance Tables (cont)

Maintenance tables for VENTCURV, IAQODIAG, andECON_CFG.

Service Config Tables (cont)

Continuation of Service Config tables for ZSENSCFG, TOUCHCFG, and TRIM.

MODE - ALARMS

CCN table listing active alarms, history, and reset functions.

APPENDIX D: SystemVut Controller CCN Tables

Service Config Tables

Tables for service configurations including UNIT_CFG, DMD_CFG, and COOL_CFG.

APPENDIX E: BACnet* Points List

UNIT START-UP CHECKLIST

PRE-START-UP Checklist Items

Pre-startup verification steps for packaging, installation, electrical, and gas systems.

HUMIDI-MIZER SYSTEM START-UP

Humidi-MiZer System Start-Up Steps

Sequential steps for starting the Humidi-MiZer system in cooling and dehumidification modes.

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