DDC
The DDC is a panel-mounted device that displays on a backlit LCD graphic display (128x64 pixels) all the status, operating and error conditions of each individual unit to which it is connected. The DDC performs the water thermostating control by switching on and off of the units connected to it.
The DDC can support and manage up to 32 modules (16 for heating and 16 for cooling) where a module is defined as the capacity of an appliance to produce chilled or hot
water.
The DDC is also capable of managing several systems configurations for the production of hot and/or chilled water, in particular:
- 1 system for the production of cold water (cold system). For example, a maximum of 16 ACF 60-00 appliances can be connected, which corresponds to a maximum of 16 cooling modules; or:
- 1 system for the production of hot water (heat system). For example, a maximum of 16 GAHP A or AY00-120 appliances can be connected, which corresponds to a maximum of 16 heating modules; or:
- 2 independent systems, one for the production of chilled water, the other for the production of hot water (4-pipe configuration) capable of operating simultaneously (a cold system and a heat system independent of each other). It is therefore possible to manage both systems as per points 1 and 2, up to a maximum of 16 heating modules and 16 cooling modules; for example, this is useful in installations with AHUs fitted with a post-heating exchanger that works at the same time as the cooling; or:
- 1 system for the alternate production (summer/winter) of hot or chilled water (2-pipe hot/cold system). This is a two-pipe system that, for example, serves the heating network in winter and the cooling network in summer. For example, a maximum of 16 GAHP-AR appliances can be connected, which corresponds to a maximum of 16 cooling modules and 16 heating modules.
For high-power systems, it is also possible to connect two or three DDCs together in order to manage up to 64 or 96 modules (up to 32 modules may be connected to each DDC).
