Direct Digital Controller
Direct Digital Controller fw 4.013 – Ed. 01/2013 135
The plant is switched on only if:
The water time segments are enabled and the external on/off command is present on the RY or RW
contacts;
If the water time segments are enabled, the plant will be activated only if an external on/off command is
present on the RY or RW contacts and if the water T timer is active at that moment.
Figure 27 shows the DDC connection diagram for aRYW operating mode.
Specific diagram for using the 3 position
general selector switch
Figure 27 – EXAMPLE OF CONNECTION OF EXTERNAL PLANT CONTROLS FOR aRYW MODE (2 LINE PLANTS ONLY)
4.5.3.1.4 Instructions for operation in AmbT mode
In AmbT operating mode, the ON – OFF command of the units is managed by a temperature sensor supplied
as an optional extra [operating range –29.9°C +109.9°C (-21,8° F +229,8° F)] located in the environment to be
cooled or heated (see example of sensor connection in Figure 28). For two-line hot/cold plants, the selection
of COOLING or HEATING mode is carried out manually by the user via the “Plant control” menu
on the
Digital Controller.
KEY:
RC1 Relay contacts for cooling system (not supplied as standard)
RC2
Relay contacts for heating system (not supplied as standard);
terminal 1 R (24 Vac)
terminal 2 W (heating plant consent)
terminal 3 Y (cooling plant consent)
morsetto 4 0 (0 Vac)
terminal 5 NA Leave not connected
terminal 6 R (24 Vac)
General diagram
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