DDB AIR CONDITIONER SYSTEMS Operation And Installation Manual

AIR CONDITIONER SYSTEMS
FOR ELECTRONIC ENCLOSURES

OPERATIONS AND INSTALLATION MANUAL

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**IMPORTANT** For safe and satisfactory operation, please read this
manual and follow the instructions for installation and operation of this
system. Keep this manual for future reference. Some information may
not apply to your system.

Introduction Page 3
Basic Operation Page 4
Unpacking Inspection Page 4
Pre-installation Test Page 5
Preparing The Enclosure Page 6
Operating Your System Page 7
Programming The Controller Page 8
Alarm Operation Page 9
Maintenance Page 10
Troubleshooting Page 11

Schematic Wiring Diagram Page 12
Warranty Back Page

Operation and Installation Manual

Where To Find Information On

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Introduction

DDB computer and electronics enclosure cooling systems have been designed to
provide a friendly environment for your equipment by cooling and de-humidifying the
enclosure, which houses your equipment in an efficient, modern, aesthetically pleasing
package requiring minimal maintenance. The closed-loop circulation design also
protects your equipment from air-borne dust and contaminants, which may hinder your
equipment operations and cause unnecessary downtime. DDB offers models ranging in
cooling capacity from 1,000 to 20,000 BTU per hour to provide cooling systems for many
of your conditioning needs. DDB also offers select models in enclosure top and side
mount packages.

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Basic Operation

The DDB air conditioning system is actually three systems, which function
simultaneously to maintain environmentally friendly conditions for your equipment within
the enclosure. These are the closed-loop cold air system, the warm air system, and the
vapor-compression refrigeration system.

The closed-loop cold air system circulates cold air from the cooling system to the
electronics enclosure. The air then returns to the system, bringing with it unwanted heat
and humidity from within the enclosure. This heat and humidity is removed by a heat
exchanger within the system. This heat exchanger is part of the vapor-compression
refrigeration system.

At the heart of the vapor-compression refrigeration’s system is a quiet, energy
efficient rotary compressor, which circulates NON-CFC refrigerant to transfer heat from
the heat exchanger (evaporator) located within the closed-loop air stream to a heat
exchanger (condenser) located in the warm air system. In the warm air system, air is
circulated from the ambient surrounding the enclosure, through a filter and across the
warm air heat exchanger. Here, heat from the enclosure is transferred from the warm air
heat exchanger to the warm air stream and dissipated to the ambient

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Unpacking Inspection

What to look for:

1. Shipping container is banded to the pallet and arrows on the shipping
container are pointing in the proper (upward) direction. The system is position

sensitive. DDB recommends the unit to remain in the proper upright position, as
indicated on the shipping container, for a minimum of 24 hours before initial operation to
ensure the oil has returned to the compressor. Operation before the 24-hour time may
cause compressor damage and shorten the life of the system. Operation before this 24­hour period will void all warranties.

2. Damage to the shipping container. If the shipping container has been damaged or
marred in any way, carefully inspect the unit for damage, which may have occurred
during shipping. Check for scratches, dents, or rattles indicating loose components,
presence of oil, or any other irregularities. Any evidence of damage should be recorded
on the freight bill. The freight carrier’s claim procedure should be followed. DDB cannot

accept responsibility for damages that occur during shipping.

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