Introduction; Startup And Shut Down; Service Switch - EngA C-TRAC3 Installation, Operation And Maintenance Manual

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INTRODUCTION

The CTRAC-3 is designed to control the cooling, heating, mixing economizer and fan(s). Additionally, it
allows for independent control of other types of equipment operations such as multi-zone and
dehumidification.
The CTRAC-3 requires a 24Vac grounded power supply. The fuse is located on the back of the control, and
has a rating of 800mA (slow blow). Fuse failure can be checked by having 24Vac across terminals H and N,
but the small green light on the face of the C-TRAC3 is not illuminated. There should also be no Vdc
reading across V and Z.
This information in this manual should be used in conjunction with the unit function sheet(s) and the
terminal designation list that accompanied the equipment.
The C-TRAC3 configuration program number is noted on the face of the C-TRAC3. This number is
important when contacting the factory about the unit operation, or for replacement parts. This number
should accompany the unit serial and tag number, and model number.
The C-TRAC3 is designed to control Engineered Air equipment only. It is not designed to simulate or
copy other controllers on the market today, nor can it be modified to do so.
CAUTION:
All of the remote wiring must be complete and functional before attempting to start
the unit.
CAUTION:
It is important that the service technician understands the C-TRAC3 is a configurable
controller. While the terminal designation remains the same, the operation of the
terminal is dependent on the required function, and may differ from unit to unit.
The C-TRAC3 is not field programmable. If the C-TRAC3 program becomes damaged or corrupted, it
must be replaced or returned to Engineered Air for re-programming.

STARTUP AND SHUT DOWN

Startup and shutdown should always be accomplished by the use of the remote start contacts and/or
switches, or the unit on/off switch or an EMS control signal. This will allow the C-TRAC3 to disable unit
operation in sequence, protecting the unit components from damage.

SERVICE SWITCH

The service switch, located in the main electrical control panel, is designed for service and maintenance
use only, and should not be used to regularly enable or disable normal operation. Once the unit has
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