American Power Conversion Central Air Conditioning System manual System Delays

Operation: Set Up System Configuration

System Delays

Path: Main > Setup > System # > System Config > System Delays

The System delays protect the Modules in the System from excessive wear and damage, and keep the modes from working against each other.

Comp Min ON. The Comp Min ON setting does not apply to Systems without compressors. For Systems with compressors (direct expansion), the delay begins when the compressor engages, and then prevents the compressor from disengaging until the delay has expired. It protects the compressors from rapidly cycling between on and off and pushing all of their lubricating oil out into the refrigerant line.

Reducing the Comp Min ON delay can shorten the lives of your compressors by causing excessive wear and damage.

Comp Min OFF. The Comp Min OFF setting does not apply to Systems without compressors. For Systems with compressors (direct expansion), the delay begins when the compressor disengages, and then prevents the compressor from engaging until the delay has expired. It protects the compressors from rapidly cycling between on and off and pushing all of their lubricating oil out into the refrigerant line.

Reducing the Comp Min OFF delay can shorten the lives of your compressors by causing excessive wear and damage.

Cndsr Vlv Dly. The Cndsr Vlv Dly setting does not apply to Systems without compressors. For Systems with compressors (direct expansion), the "condenser fluid valve close delay" begins when the compressors disengage, and then keeps coolant flowing through the heat exchanger until the delay expires. Once the delay expires, the condenser fluid valve closes.

Intrstg Dly. The Intrstg Dly setting does not apply to Systems without compressors. For Systems with compressors (direct expansion), the interstage delay begins when the first compressor (stage 1) in a Module engages. It prevents a second compressor (stage 2) in a System from engaging until the delay has expired.

Start-up Dly. The Start-up Dly applies to all System configurations. The delay begins when the System is started and initialized. The System cannot begin operation until this delay has expired. Use the start-up delay to restart equipment sequentially in your room after a power loss.

Mode Dly. The Mode Dly setting applies to all System configurations. The delay begins when the blowers start. It allows the sensors to obtain an accurate reading of the room conditions, and the System to check for major alarms before engaging environmental control functions.

Communication Loss Shutdown Delay. The Comm Loss Shutdown Dly applies to Multi-

Module Systems. The delay begins when an Expansion Module loses communication with the Main Module of a System. If communication is not restored before the delay expires, the Expansion Module shuts down. Set the delay for up to twenty-four hours, or select Disabled to cause the Expansion Modules to remain operating if communication with the Main Module is lost.

8 NetworkAIR IR Operation, Maintenance, and Troubleshooting