Functional Control
ESIE07-05
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Part 2 – Functional Description
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2.10
Pump Control
Introduction
To prevent the chiller to start up without flow, safety checks are performed.
First there is a check to make sure that water flows through the system.
The pump control of the user menu allows the user to define the pump lead and the pump lag time.
Pump lead time
When the unit is switched on, the pump will run for 30 seconds before the chiller (compressors) can
start. During this 30 seconds pump lead time you also need a closed flow switch for 20 seconds.
Pump lag time
When an off signal is given to the controller (thermostat, local/remote switch,...) the pump will run for
another 180 seconds before switching off (pump lag time). During this 180 seconds, the unit will
execute the pump down procedure.
Pump / Fan and Comp.
Start
030 s
Time Between Main
the Main Pump Off
180 s
Delay on Switching
ESIE07-05.book Page 62 Friday, December 21, 2007 3:21 PM
