Sequential Mode

Description

The SY1 SY2 contacts of the synchronization mode terminal of two cooling units with the same commercial reference are connected in parallel.

At start-up, regulation is managed by cooling unit 1. Cooling unit 2 is in standby.

When cooling unit 1 reaches the t01 compressor working hours (h*10), it closes the synchronization output and goes into standby. Cooling unit 2 reads the synchronization signal and becomes operative for t01 compressor working hours. When cooling unit 2 reaches t01 compressor working hours, it goes into standby and cooling unit 1 starts again.

In case of High Temperature Alarm HAL for any of the cooling units, the alarm starts without waiting for the sequential time.

Setting Procedure

Enter the Programming menu:

1. Press and hold SET for at least 5 seconds.

2. Scroll to PA1. Press SET to enter PA1 password using the keys and . Press SET to confirm.

Set cooling unit 1:

1. Scroll to H11 and press SET.

2. Change value to +15 using the keys and Press SET to confirm.

3. Scroll to t01 and press SET.

4. Change value for working hours (h*10) using the keys and . Press SET to confirm. The default value is 1 (10 hours).

Set cooling unit 2:

1. Scroll to H11 and press SET

2. Change value to -15 using the keys and . Press SET to confirm.

3. Scroll to t01 and press SET.

4. Change value for working hours (h*10) using the keys and . Press SET to confirm. The default value is 1 (10 hours).

The changes made to the parameters are taken into account after powering Off and On the cooling units.