Daikin EWYQ230DAYN [341/524] Compressor control

ESIE06-05 Functional Control for a Standalone Unit

Part 2 – Functional Description 2–115

3.6 Compressor Control

Lead Lag control Introduction

The lead lag control mode determines which circuit/compressor starts up first in case of a capacity

demand. It prevents the unit from always starting up the same circuit or compressor.

Possible modes:

■ Auto : the controller decides which compressor starts first.

■ Priority : the user can select the sequence of the compressor starts (fixed)

Remark : the different modes can be selected in the user/compressor menu.

Lead Lag in Auto

Mode

When the lead lag control is done automatically, the software calculates the differences in operation

time between the compressors.

Start up priority in

Auto Mode

At first, power on:

Start up priority compressor : cir 1-1 -> cir 2-1* -> cir 1-2 -> cir 2-2 *

Remark : (*) is not applicable for 30hp and 40hp unit.

Reason : There are only 2 compressors (1 circuit) for 30hp and 40hp unit.

Stop priority in Auto

Mode

Remark : (*) is not applicable for 30hp and 40hp unit.

Reason : There are only 2 compressors (1 circuit) for 30hp and 40hp unit.

In case running hours has the same value for several compressors in start/stop priority. Start up priority

compressor : cir1-1 -> cir 2-1* -> cir1-2 -> cir2-2* (stop priority is opposite).

Sequence Status Start-up priority

0 compressors running Compressor with least running hours

1 compressor running Compressor wit least running hours of

the other circuit

2 compressors running* Compressor with least running hours

3 compressors running* Start compressor 4.

Sequence Status Start-up priority

4 compressors running* Compressor with most running hours

3 compressor running* Compressor with the most running

hours of the circuit with two compres-

sors running

2 compressors running Compressor with the most running

hours

1 compressors running Stop compressor.