Serial Mode

Description

Serial mode allows the propagation of the door contact alarm between connected cooling units. Up to 10 cooling units can be connected in this mode with a maximum length of 10 m (33 ft).

Several cooling units can be installed in a large panel, with one cooling unit per compartment. If the compartments are not segregated, all the cooling units can work simultaneously in parallel, with the risk that one open compartment door allows all the cooling capacity to be wasted. Serial mode helps to mitigate this risk by stopping all the cooling units in the case of one open door, and sending one alarm signal for the cooling system.

The door contact is connected only in the first cooling unit. The alarm output is wired only in last cooling unit.

When the door is open, the door contact connected to the door contact input of cooling unit 1 is used to deliver the synchronization signal. Other connected cooling units receive the same information and act accordingly.

Setting Procedure

Follow this procedure to put the cooling units into serial mode:

Enter the Programming menu:

Press and hold SET for at least 5 seconds.
Scroll to PA1. Press SET to enter PA1 password using the keys and . Press SET to confirm.

Set the first cooling unit:

Scroll to H11 and press SET.
Change value to 16 (door contact propagation) using the keys and . Press SET to confirm. The default value is 0.
Scroll to H13 and press SET
Use the keys and to change the value to:
- -4 if the door contact is an NC contact (contact closed when door is closed). Default value.
- +4 if the door contact is an NO contact (contact open when door is closed).
. Press SET to confirm.

Set the other cooling units:

Scroll to H11 and press SET.
Change value to +4 using the keys and . Press SET to confirm.
Scroll to H13 and press SET.
Change value to 0 (disabled door contact) and press SET to confirm.

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