Vertiv | Liebert PEX+Chilled Water | User Manual 70
iCOM Controller Operation
4.10.3. Standby and Cascade
• Cascade is possible in Teamwork Mode 1 and 3 only.
• Line S508 Cascade Units has the options of Yes, Cool / Heat, Cooling, Fan
• Yes -Based on a call for heating, cooling, humidification or dehumidification. Teamwork Mode 1
• Cool / Heat- Based on a call for heating or cooling. Teamwork Mode 1
• Cooling - Based on a call for cooling. Teamwork Mode 1
• Fan - The only selection available for Teamwork Mode 3; not available in Teamwork Mode 1. This uses fan
control deviation to stage on standby unit fans/cooling. Fans stage serially according to the system fan control
band and temperature control is based on the local supply deviation (Fan proportional band/number of
connected units). The standby unit will remain On for the time set in the parameter. The default is 30 minutes;
the range is from 2 to 360 minutes.
Standby units will start if an alarm occurs in one of the operational units. If the standby units are cascaded or in
Teamwork Mode 3, they will also start and work with the regular operational units. If the temperature or humidity
cannot be controlled by the operational units, Cascaded units are switched O again as soon as the temperature/
humidity returns back to normal before a high or low temperature/humidity condition occurs. .
The master unit defines its proportional band according to the number of available units. When a standby unit
receives a request for full heating or cooling from the master unit, it will respond to the request after its control
delay.
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