Carrier 50NC 118 - User Manual

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USER MANUAL

Translation of the original document 80307, 06.2023

“50FC” electronic control

50FF/FC 020-280

50NC 022-118

Table of Contents

Other manuals for Carrier 50NC 118

Installation, Operation And Maintenance Instructions44 pages

Questions and Answers:

M
Michael MorenoAug 10, 2025
What to do if my Carrier 50NC 118 LCD has strange characters or a blank display?
- K
  Kelly SkinnerAug 10, 2025
  If your Carrier Air Conditioner's LCD shows strange characters or a blank display when switching on, check the following: 1. That the software in the flash is correct. 2. The addresses of the ?PC3 control board and the Graphic terminal (check that they comply with the requirements of the current application). 3. The connection between the Graphic terminal and the ?PC3 board.
V
Virginia GutierrezAug 20, 2025
What to do if there is an unusual alarm signal from the digital input of my Carrier 50NC 118?
- J
  Julie ColemanAug 20, 2025
  To troubleshoot unusual alarm signals from the digital input of your Carrier Air Conditioner, check if the alarm signal is present at the input. Measure the voltage between the 'IDC' common terminal and the digital input terminal which indicates the alarm 'IDn'. If voltage is present (24 Vac or Vdc, depending on the power supply used for the digital inputs), the contact of the connected alarm device is closed. If the voltage is near 10 Vac or 10 Vdc, the contact is open.
V
vsmithAug 30, 2025
How to troubleshoot erroneous readings of the input signals on a Carrier Air Conditioner?
- B
  brookerodriguezAug 30, 2025
  To troubleshoot erroneous readings of the input signals in your Carrier Air Conditioner, check the following: 1. The correct power supply to the control board and probes. 2. The separation between the power supply of the digital inputs and that of the control board. 3. That the cables from the probes are connected according to the instructions. 4. That the probe cables are located far enough away from possible sources of magnetic interference (power cables, contactors, high voltage cables or cables connected to units with high current peaks). 5. That there is not a high level of heat resistance between the probe and the sensor cap (if present). If necessary, apply conductive paste or oil into the caps to ensure good temperature transfer.

Carrier 50NC 118 Specifications

General

Brand	Carrier
Model	50NC 118
Category	Air Conditioner
Language	English

Summary

General Description of Carrier 50 FC Control

Sensors for Unit Operation

Lists standard and optional sensors used for unit operation and data collection.

BMS Communication Options

User Interfaces Overview

Standard Graphic Terminal

Details the features and operation of the standard graphic terminal, including buttons and initial setup.

Optional User Terminal

Optional Touch Panel

Explains the optional touchscreen panel, its features, buttons, and home screen navigation.

Starting and Stopping the Unit

Setpoint Selection Procedures

Operating Mode Selection

Cooling Mode Operation

Details the unit's operation and stage control in cooling mode.

Heating Mode Operation

Explains unit operation, backup components, and stage control in heating mode.

Time Scheduling Configuration

Scheduling with Graphic Terminal

Display of Inputs and Outputs Status

Safety Functions Overview

Defrosting Function Details

Explains the defrosting procedure, activation conditions, and operation.

Anti-Fire Safety Mechanism

Details the anti-fire safety device activation and unit response to high temperatures.

High Supply Temperature Safety

Describes the safety function for high supply temperatures, shutting down optional heaters/burners.

R-454 B Refrigerant Leak Detector (Standard)

Covers the standard R-454B refrigerant leak detector, its activation, and protection modes.

R-410 A Refrigerant Leak Detector (Optional)

Explains the optional R-410A refrigerant leak detector, its connection, and alarm conditions.

Compressor Lock Safety Feature

Describes the compressor lock function after power interruptions and reset procedures.

High;Low Indoor Temperature Safety

Details the safety function for indoor temperature deviations, triggering alarms.

Optional Low Temperature Protections

Optional Clogged Filter Detector

Optional High-Speed Plug-Fan Safety

Optional Tandem Compressor High Temp Safety

Alarm Management

Alarm Display Methods

Details how alarms are displayed on both graphic and user terminals and how to reset them.

Optional Remote Alarm Signaling

Comprehensive Alarm List

Provides a comprehensive list of controlled alarms, their types, actuation, and levels.

Alarm Levels for Back-up Function

Control Parameters Reference

Unit On;Off Control Parameters

Setpoint Configuration Parameters

Lists parameters for setting internal and external temperatures and humidity levels.

Clock and Scheduler Parameters

Connections and Wiring

Main Control Board Connections

Provides a detailed diagram and description of the main control board connections and terminals.

Terminal Connections to Control Board

Basic c.pCOe Expansion Module Connection

Enhanced c.pCOe Expansion Module Connection

Troubleshooting Common Issues

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