I Quote from a Carel PCo2 Manual

Pump lead/lag time The PUMPCONTROL of the user settings menu allows the user to define the
pump-lead time and pump-lag time.
Line n° Display Description Default value Limit value
1 PUMP CONTROL Screen title
2 PUMPLEADTIME
Time to run the water pump
before starting up the chiller
020 s 020-180 s
3 PUMPLAGTIME
Time to run the water pump
after stopping the chiller
000 s 000-180 s
Remark : the default value for the PUMPLAGTIME 0 s but it is recommend to set the lag time to
120s. This is to prevent that the evaporator freezes up.

Grizzly