Direct Digital Controller
132 Direct Digital Controller fw 4.013 – Ed. 01/2013
Diagram only for 2 line plants with only one
consent available
Figure 26 – EXAMPLE OF EXTERNAL CONTROL PLANT CONNECTIONS FOR RYWm MODE
4.5.3.1.3 Instructions for operation in aRYW mode
In RYWa operating mode (two-line hot/cold plants only), selection of COOLING or HEATING operation is
managed by the external contacts RY and RW.
Closing the contacts R - Y of connector D located on the rear of the Direct Digital Controller (see Figure 13 on
page 54) entails:
Switching on the plant;
Passing to COOLING mode, if currently in heating mode;
Activation of the units.
Closing the contacts R - W of connector D located on the rear of the Direct Digital Controller (see Figure 13 on
page 54) entails:
Switching on the plant;
Passing to HEATING, mode, if currently in cooling mode;
Activation of the units.
Opening the R - Y or R - W contacts entails:
KEY:
R1 On/off command relay contacts (not supplied as standard)
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)
terminal 4 0 (0 Vac)
terminal 5 NA Leave not connected
terminal 6 R (24 Vac)
Diagram for 4 line plants and 2 line plants
with separate consents
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