Lennox VEP034N432US User Manual

DC Inverter Multi VRF System User Manual
Thank you for selecting LENNOX air conditioners. Please read this manual carefully before operation
and keep it for further reference.

Lennox VEP034N432US Specifications

General

Model	VEP034N432US
Refrigerant	R-410A
Phase	1
Cooling Capacity	34000 BTU/h
Voltage	208-230V

Summary

Safety Notices

General Safety Precautions

Important warnings and prohibitions for safe operation and handling of the unit.

Installation and Electrical Safety

Guidelines for safe installation, grounding, and electrical connections to prevent hazards.

Refrigerant Handling Safety

Precautions for handling refrigerant, including ventilation and potential hazards.

Electrical and Operational Safety

Covers power cord, startup/shutdown, child safety, and handling precautions.

Operational and Environmental Safety

Guidelines on cleaning, temperature settings, and responding to abnormal conditions.

Product Introduction

VRF System Technology

Overview of inverter technology, capacity range, and application areas for the VRF system.

Outdoor Unit Components

Identifies main parts of outdoor units through diagrams and model references.

Indoor and Outdoor Unit Combinations

Details on connecting indoor units and capacity matching requirements for the VRF system.

Operating Temperature Range

Specifies the allowable outdoor temperature ranges for cooling and heating modes.

Preparation before Installation

Standard Installation Parts

Lists essential parts provided with the outdoor unit for installation, including manuals and fittings.

Installation Site Selection

Guidelines for choosing a safe, stable, and well-ventilated location, away from hazards and children.

Piping Work Requirements

Specifies requirements for piping work, including pipe diameter and wall thickness for R410A systems.

Installation Instruction

Outdoor Unit Dimensions and Mounting

Provides dimensions and mounting hole information for various outdoor unit models.

Piping Connection Schematic

Illustrates the connection layout for piping between the outdoor unit and multiple indoor units.

Connection Pipe Length and Height Limits

Details allowable lengths and height differences for connection pipes in VRF systems.

Main Pipe and Outdoor Connection Pipe Dimensions

Specifies pipe dimensions for main connections from ODU to IDUs and outdoor connection pipes.

Indoor Branch and Inter-Branch Piping Selection

Guides the selection of indoor branches and pipe dimensions based on total downstream unit capacity.

Indoor Branch to IDU Pipe Sizing

Specifies pipe sizing between indoor branches and individual IDUs based on their rated capacity.

Connection Pipe Installation Precautions

Covers essential precautions for pipe installation, including bending, flaring, and welding processes.

Indoor and Outdoor Pipe Connection Procedures

Details the steps for connecting indoor and outdoor pipes, including torque specifications and insulation.

Y-Type Branch Installation

Explains the installation of Y-type branches, including cutting and proper dimensioning for connections.

Pipeline Thermal Insulation

Guidelines for thermal insulation of pipelines to prevent condensate and ensure proper operation, including material selection.

Pipeline Support and Protection

Covers requirements for supporting and protecting installed pipelines against damage and sagging.

Compressor Feet and Transportation Parts

Instructions on removing compressor feet and transportation pieces before unit operation.

Vacuum Pumping Procedure

Steps for performing vacuum pumping on the indoor unit and connection pipe before refrigerant charging.

Refrigerant Charging and Calculation

Details on refrigerant quantity, calculation methods, and procedures for adding refrigerant to the system.

Electrical Wiring Safety and Requirements

Covers safety notices, codes, grounding, and component requirements for electrical wiring.

Wiring Diagrams and Connections

Provides diagrams for connecting power cords and communication wires between outdoor and indoor units.

Circuit Breaker and Power Cord Selection

Specifies the correct circuit breaker capacity and power cord size based on the unit model and power requirements.

Engineering Wiring Views

Illustrates the wiring of power supply and communication cables for specific outdoor unit models.

Post-Installation Checks

Lists essential checks to perform after installation to ensure proper setup and identify potential issues.

Check Items after Installation and Test Operation

Pre-Test Operation Checks

A checklist of items to verify before commencing test operation after installation.

Test Operation and Debugging Preparation

Outlines the necessary preparations before performing test operation and debugging of the VRF system.

Test Operation and Debugging Procedures

Details the step-by-step procedures for test operation and debugging, including status codes and meanings.

Normal Operation Parameter References

Provides reference values for key operational parameters of the ODU, such as temperatures, pressures, and frequencies.

Common Malfunctions and Troubleshooting

Basic Troubleshooting Guide

Offers solutions for common issues like unit not working, stopping immediately, or abnormal cooling/heating.

Troubleshooting Specific Issues

Addresses specific malfunctions such as mist, noise, dust, and odor, clarifying what is and isn't a malfunction.

Error Indication

Indoor Unit Error Codes

Lists error codes for indoor units, their causes, and corresponding meanings for diagnosis.

Outdoor Unit Error Codes

Lists error codes for outdoor units, detailing malfunctions related to sensors, motors, and protection circuits.

Debugging and Status Codes

Provides codes related to system debugging progress and operational status for diagnosis.

Maintenance and Care

Routine Maintenance Procedures

Details cleaning and checks for the heat exchanger, drain pipe, and seasonal preparation/storage.

Parts Replacement and Testing Safety

Information on obtaining replacement parts and safety precautions during testing.