Atlas Metal CAH Installation Manual

Installation and Maintenance Manual IM 808-1

Ultraviolet Lights on  McQuay Vision™ Air Handlers

Models CAH/CAC

Group: Applied Systems

Part Number: IM 808-1

Date: November 2009

IM-808-1 Page 1

Table of Contents

Viewing

window

Ultra violet

light units

Light power

disconnect

switch

Cooling

coil

Air flow

Introduction.......................................................................................................................................................................................2

Description ........................................................................................................................................................................................2

Operation........................................................................................................................................................................................... 2

Replacing Bulbs ................................................................................................................................................................................3

Removing Lamp Units ......................................................................................................................................................................3

Replacement Parts List......................................................................................................................................................................4

Typical ultraviolet light wiring schematic ........................................................................................................................................ 4

Introduction

This manual provides general information about the Ultraviolet Light option for McQuay Vision™ Indoor Air Handler, Models CAH/CAC. In addition to an overall description of the unit, it includes removal and installation procedures, maintenance instructions and parts identification.

Description

The ultraviolet light application is designed to irradiate the coil surface along with the drain pan. Germicidal protection is delivered at a wavelength of 254 nanometers in the light spectrum. Light at this wavelength is known as UV-C. Most bacteria, mold, and virus organisms are killed by exposure to UV-C light.

Ultraviolet lights are typically installed on the leaving side of the cooling coils in the unit. Each light module is mounted on a rail and is removable for convenient bulb replacement.

UV Light Power Disconnect switches are factory installed on every access panel that allows a direct line of sight to the UV lamps when opened. These switches are designed to prevent UV exposure when cabinet access panels are opened and must not be disabled.

A viewing window near the UV lights allows viewing to determine if the lights are energized. The viewing windows use specially designed glass that blocks harmful UV light.

WARNING

UV-C exposure is harmful to the skin and eyes. Looking at an illuminated UV-C bulb can cause permanent blindness. UV-C skin exposure can cause cancer.

Always disconnect power to power receptacle before servicing. Do not operate if disconnect switch has been disabled.

Figure 1. Typical ultraviolet light installation

Operation

Refer to the wiring schematic on page 4. 115 VAC power for the UV lights is provided by the field. The lights operate whenever the unit is powered and all access panel power disconnect switches are closed. To turn the lights off, disconnect power to the power receptacle.

The normally open interlock switches are wired in series in a circuit that supplies 115VAC to the UV lights when all access panels are closed.

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