约克YORK制冷管路设计

制冷管路设计

APPLICATION DATA SHEET

General Piping Recommendations and Refrigerant Line Length

for Split-System Air Conditioners and Heat Pumps

GENERAL GUIDELINES

The following guidelines apply to the application on either factory line sets or field fabricated tubing for cooling only and heat pump systems:

Many service problems can be avoided by taking adequate precautions to provide an internally clean and dry system and by using procedures and materials that conform with established standards.

The lines should be installed so that they will not obstruct service access to the indoor coil, air handling system or filter. Install the lines with as few bends as possible. Care must be taken not to damage the couplings or kink the tubing. Care must also be used to isolate the refrigerant lines to minimize noise transmission from the equipment to the structure. Never solder vapor and liquid lines together. They can be taped together for convenience and support purposes, but they must be completely insulated from each other. Support all refrigerant lines at minimum intervals with suitable hangers and brackets. Tape and suspend the refrigerant lines as shown in Figure1. DO NOT ALLOW METAL-TO-METAL CONTACT.

INTRODUCTION

Installation of residential and commercial split-systems should be performed by qualified service technicians with proper training in the installation, service and repair of these units.

This document should serve as a guideline for proper split-system piping installation. Read these instructions along with the unit installation instructions carefully and adhere to all cautions,

warnings and general practice guidelines. Consult local building codes for special requirements.

The tables and application data in this publication will help you to better apply split-system cooling and heat pump systems to

achieve maximum efficiency and performance, improved reliability, and greater customer satisfaction. This guideline includes information for:

General Guidelines

Indoor Unit Above the Outdoor Unit Outdoor Unit Above the Indoor Unit Total line length Line

Sizing

Additional Refrigerant Refrigerant Oil Management Accumulator Use and Misuse Recommended Orifice Sizing Chart Long Line Set Applications

FIGURE 1:Refrigerant Line Support

Slope horizontal suction lines on cooling only systems

approximately 1 inch every 20 feet toward the outdoor unit to facilitate proper oil return. Since the flow of refrigerant is bi-directional on heat pumps, all horizontal vapor lines should be level. Pre-charged lines with excess tubing should be coiled horizontally in an inconspicuous location to avoid oil trapping. Never coil excess tubing vertically. Use long radius elbows wherever possible.

Use PVC piping as a conduit for all underground installa-tions. See Figure2. Buried lines must be kept as short as possible to minimize the build up of liquid refrigerant in the vapor line during long periods of shutdown.

247077-UAD-H-0209

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