20-80 Ton Self-Contained Air Conditioners - Page 16

control module digital readout (refer to Figure 13-1) are accessible at the Tracer CRT. In addition, there are several more points of information available through the Tracer computer. Included are:

• Compressor on/off status
• Ventilation status
• Condenser water flow status
• % FLA supply fan
• Heat status
• Heat hours and starts
• Each compressor operating hours
• Each compressor starts
• Supply fan operating hours
• Supply fan starts
• % RLA of each compressor
• Supply air pressure
• Supply air temperature
• Suction temperature of each circuit
• Entering economizer water temperature
• Zone temperature
• Entering condenser water temperature
• Leaving condenser water temperature
• Supply air temperature reset signal
• Morning warmup sensor temperature
• Entering air temperature

Time Clock

With this option, a programmable timer is supplied and wired to the External Interlock Auto/Stop input to provide on/off control of the unit. The timer is factory mounted and is accessible without opening any unit panels. The timer is a seven day timer with a minimum of 4 operations per day (two on and two off). The timer has a permanent built-in rechargeable battery back-up system.

Unit Control Module The unit control module is programmed at the factory to provide complete control of unit operation in all standard and optional operating modes. This control logic is an integral part of the unit microprocessor and cannot be modified. The following table (17-1 ) illustrates the status of the control outputs during each of the unit operating modes.

Table (17-1 ) Control Output Status