1 | 028-0485-00 November 2017
Features
• 0 to 10 VDC modulating
output
• VDC pulsed modulating
output
• VAC pulsed modulating output
• Night setback digital input
• Room or supply control
applications
Description
The VT7225 series controllers are microcomputer-based, proportional and
integral (PI) devices with one analog 0 to 10 Vdc output, one 8 Vdc and one 24
Vac proportioning pulsed output.
The analog 0 to 10 Vdc modulating output can control the room or supply
temperature by modulating directly a 0 to 10 Vdc SCR power controller.
The Vdc and Vac pulsed outputs can control the room or supply temperature by
modulating directly 4-32 Vdc triggered solid state relays (SSR’s) using a time
proportioning control algorithm on a 1 second time cycle.
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