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Functional Control for a Standalone Unit ESIE06-05

2–152 Part 2 – Functional Description

MODE: DISCONNECT

DISCONNECT: Units which are defined as ''DISCONNECTED'', can be put ''ON/OFF'' or set to

MANUAL MODE independent from the other units. This can be very useful e.g. in case of servicing.

When changing to ''NORMAL'' or ''STANDBY'', the unit becomes part of the system again.

OFFSET

The OFFSET time defines the target difference in running hours between one unit and another unit

with OFFSET:0000 h. This value is important for maintenance purposes. The difference in setting

among different units should be high enough as to avoid servicing of the units all at the same time. The

lower and upper limits are 0 and 9000 hours respectively. The default value is 0 hours.

For units with 2 circuits, the individual lead/lag setting is valid as to determine the priority of the circuits.

E.g. if following setting is made:

Unit 1 = 0 h

Unit 2 = 1000 h

Unit 3 = 2000 h

Unit 4 = 2000 h

Then unit 3 and 4 will be operated most. They will get priority in operation as to reach 2000 running

hours more than unit 1. Unit 1 will be the unit with the lowest running hours.

PUMP ON IF

Set if the pump must operate as long as the chiller is ON (UNIT ON), or during compressor on condition

only (COMPR ON).

■ When UNIT ON is selected, the voltage free contact S9L will remain closed as long as the chiller

is ON.

The pump of individual unit will run if unit is on.

■ When COMPR ON is selected, the voltage free contact S9L will remain closed as long as the

compressor is ON.

Remark: If no pumpcontact is closed (ex all pump on if “COMPR ON” & no request to loadup) then turn

on the pumpcontact of the unit with highest priority. (This is needed because the temperature sensor

must be able to measure the correct water temperature).