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Functional Control for a Standalone Unit ESIE05-07

2–44 Part 2 – Functional Description

Dual evaporator

pump control

When dual pump control is allowed an extra digital output is needed (see Service Menu). In total four

choices will be possible: one pump (default), two pumps with automatic rotation (by running hours and

with a certain offset), priority pump 1 and priority pump 2.

(The default setting is automatic rotation)

When the dual evaporator pump control is set in automatic rotation, the software calculates the

differences in operation time between the two pumps. When this time exceeds the chosen offset time,

the pump will shut down and the other pump will start up, during this the unit keeps running. The

switchover will happen immediately, there is no transition time.

Remark: In case two pumps are present and the running pump fails then the unit is stopped and

started up again with the other pump. When the first pump fails a visible warning will be given. The

failed pump can not start up before this warning is reset. If the running pump fails while the other pump

is already in warning a unit alarm will be given.

Condenser pump This function is only available on water-cooled units.

The condenser pump control can operate in two ways:

P In cooling mode: the condenser pump contact will close on command of the thermostat function.

P In other mode (heating/double thermostat): the condenser pump contact will close if the evaporator

pump contact is closed.

When condenser pump control is allowed an extra digital output is needed (see service menu).

Heat recovery

condenser pump

This function is only available on heat recovery units.

If Heat recovery mode is active in circuit1 or circuit2 then HR pump contact is closed. This pump is the

waterpump that circulates the water of the heat recovery load.

The HR pump contact is a changeable digital output.

Line n° Display Possible setting Description

1 DUAL EVAP. PUMP

2a MODE AUTOM. ROTATION The controller decides whether

pump 1 or pump 2 starts up first

2b MODE PUMP 1>PUMP 2 Pump 1 starts up before pump 2

2c MODE PUMP 2>PUMP 1 Pump 2 starts up before pump 1

Line n° Display Description Default value Limit value

3 OFFSET ON RH Running hours offset value 048h 001h-999h

ESIE05-07.book Page 44 Wednesday, October 11, 2006 10:42 AM