York VSD 790 - User Manual

035-27337-100
Form Number: 160.00-O4 (820)
Supersedes: 160.00-O4 (220)
Operation Manual
Issue Date: 2020-08-19
Liquid-Cooled OptiSpeed Compressor
Speed Drive
Models VSD 270, 292, 351, 385, 419, 424, 503, 608, 658, 704,
790, 868, 882, 917, 948, and 1055. Models LVD 270, 292, 351,
385, 419, 424, 503, 608, 658, 704, and 900.

Summary

General Safety Guidelines

Model Identification and Maintenance

VSD Model Nomenclature and Parts

Explains VSD model naming and lists part numbers.

LVD Model Nomenclature and Parts

Explains LVD model naming and lists part numbers.

System Overview and Control

OptiSpeed and Harmonic Filter Components

Harmonic Filter Option Details

Details on the optional harmonic filter and its components.

OptiSpeed Control System Overview

Overview of the OSCD control system and its components.

Operational Control and Troubleshooting

VSD Adaptive Capacity Control

Explains the YORK OSCD's adaptive capacity control approach.

Setpoint and Stability Requirements

Conditions required for OSCD speed reduction and system stability.

Surge Detection and Management

Details compressor surge effects and handling.

Drive Speed Reduction Issues

System Architecture and Components

System Architecture Overview

Printed Circuit Boards

Shutdown and Warning Messages

Safety Shutdown Messages

Details various safety shutdown messages and their causes.

Cycling Shutdown Messages

Details various cycling shutdown messages and their descriptions.

Warning Messages

Frequently Asked Questions (FAQs)

Chiller Slow Down Issues

York VSD 790 Specifications

General

Brand	York
Model	VSD 790
Category	Air Compressor
Language	English