Distech Controls ECB-PTU Series - Page 8

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Figure13: Relay Contact outputs - Electric Heater (I-Electric Heater > I-Max )
Wiring Triac Outputs
Depending on models, triac outputs provide either the same voltage as the power supply (100-240 VAC) or 24 VAC. Refer to the controller’s Datasheet
for further specifications.
The triac outputs can also be used to turn equipment and devices on and off (two-state outputs) and to control valve and damper actuators using Pulse
Width Modulation (PWM).
Controller Digital (Triac) Outputs
(100-240 VAC)
Digital (Triac) Outputs
(24VAC)
ECB-PTU-107 DO5 - DO6 -
ECB-PTU-207 DO5 - DO6 -
ECB-PTU-208 - DO5 - DO6
ECB-PTU-307 DO5 - DO6 – DO9 – DO10 -
ECB-PTU-308 - DO5 - DO6 – DO9 – DO10
Table5: Triac output names and specifications
£ Triac output connectors accept wires between 1 mm² (17 AWG) and 1.5 mm² (16 AWG). Make sure the cable performances suit
the connected loads.
£ To measure the state of a triac output, an external load must be connected.
£ It is not necessary to use a fuse when the onboard 24 Vac output is being used with the triac outputs since it already has built-in
short circuit protection (ECB-PTU-208 and ECB-PTU-308 only).
Figure14: Thermal valve wiring (ECB-PTU-107/207/307)
Figure15: Thermal valve wiring (ECB-PTU-208/308)
Figure16: Proportional valve wiring (ECB-PTU-107/207/307)
Figure17: Proportional valve wiring (ECB-PTU-208/308)