Carrier 48LC Series User Manual

24
Fig. 16 — Subcooling Mode – Humidi-MiZer System for 48/50LC*07-26
Fig. 17 — Hot Gas Reheat Mode – Humidi-MiZer System for 48/50LC*04-06
Fig. 18 — Hot Gas Reheat Mode – Humidi-MiZer System for 48/50LC*07-26
HUMIDI-MIZER COIL
COMPRESSOR
OUTDOOR AIR
INDOOR SUPPLY
AIR
INDOOR RETURN
AIR
3-WAY
VALVE
EXPANSION
VALVE
(TXV)
RDV
VALVE
EVAPORATOR COIL
CONDENSER COIL
= CLOSED VALVE
= OPEN VALVE
= 3-WAY VALVE
HUMIDI-MIZER COIL
COMPRESSOR
OUTDOOR AIR
INDOOR SUPPLY
AIR
INDOOR RETURN
AIR
RLV
VALVE
CLV
VALVE
RDV
VALVE
EVAPORATOR COIL
CONDENSER COIL
= CLOSED VALVE
= OPEN VALVE
EXPANSION
VALVE
(TXV)
HUMIDI-MIZER COIL
COMPRESSOR
OUTDOOR AIR
INDOOR SUPPLY
AIR
INDOOR RETURN
AIR
3-WAY
VALVE
RDV
VALVE
EVAPORATOR COIL
CONDENSER COIL
= CLOSED VALVE
= OPEN VALVE
= 3-WAY VALVE
EXPANSION
VALVE
(TXV)

Carrier 48LC Series Specifications

General

Brand	Carrier
Model	48LC Series
Category	Air Conditioner
Language	English

Summary

SAFETY CONSIDERATIONS

GENERAL SYSTEM INFORMATION

Manual Conventions and Basic Control Usage

Explains manual conventions, SystemVu interface, and fundamental control operations.

SystemVu Controller and Navigator Display Overview

Details the SystemVu interface, Navigator display, and related devices for unit control.

UNIT START-UP AND CONFIGURATION

Pre-Start-Up Checks and Preparations

Covers electrical, refrigerant, and component checks before initial unit start-up.

Initial Control System Setup

Guides through quick setup, network configuration, and system auto-tests.

SystemVu Controller Configuration Parameters

Details settings for thermostat, CCN, System Pilot, and accessories.

OPERATING MODES AND CONTROL LOGIC

Service Test Procedures and Modes

Outlines diagnostic tests for various unit components and operational modes.

Dehumidification, Economizer, and Air Quality Control

Explains the operation and configuration of dehumidification, economizer, and IAQ functions.

Demand Determination and Occupancy Control

Details how unit demand is calculated and occupancy affects operation.

TROUBLESHOOTING AND ALARMS

System Alarms, Faults, and Alerts

Explains how to view, interpret, and clear system alarms and faults.

Component-Specific Troubleshooting

Covers troubleshooting for VFDs, economizers, heating systems, and communication issues.

Major System Components and Service Analysis

Provides diagrams and tables for analyzing component performance and service issues.