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. VT7225 Series Installation Guide For Modulating Electric Heat Applications November 2017 2 | 028-0485-00 November 2017 C ONTENTS Installation 3 Location 3 Installation 3 BI 1 5 UI 3 5 Terminal Identification and Function 5 Output Types 6 Wiring 7 Remote sensor accessories 11 3 | 028-0485-00 November 2017 I NSTALLATION Remove security screw on bottom of Room Controller cover. ▪ Open unit by pulling on bottom side of Room Controller (fig. 1). ▪ Remove wiring terminals from sticker. ▪ Read FCC ID and IC label installed in the cover. Location 1. Do not install on outside wall. 2. Do not install in areas exposed to direct heat source. 3. Do not install near an air discharge grill. 4. Do not install in areas exposed to direct sunlight 5. Do not install in areas that restrict vertical air circulation to Room Controller. Installation 1. Swing open Room Controller PCB to left by pressing PCB locking tabs (fig. 2). 2. Pull out cables 6” out from the wall. Ensure wall surface is flat and clean. 3. Insert cable in central hole of base. 4. Align base and mark location of two mounting holes on wall. Install proper side of base up. 5. Install anchors in wall. 6. Insert screws in mounting holes on each side of base (fig. 2). 7. Gently swing back circuit board on base and push until the tabs lock. 8. Strip each wire 1/4 inch from end. 9. Insert each wire according to wiring diagram. 10. Gently push excess wiring back into hole (fig. 3). 11. Re-Install wiring terminals in their correct locations (fig. 3). 12. Re-install cover (top side first) and gently push extra wire length back into hole in wall. 13. Install security screw. 4 | 028-0485-00 November 2017 ▪ If replacing an existing Room Controller, label the wires before removal of the Room Controller. ▪ Electronic controls are static sensitive devices. Discharge yourself properly before manipulating and installing the Room Controller. ▪ A short circuit or wrong wiring may permanently damage the Room Controller or the equipment. ▪ All VT7000 series Room Controllers are designed for use as operating controls only and are not safety devices. These instruments have undergone rigorous tests and verification prior to shipping to ensure proper and reliable operation in the field. Whenever a control failure could lead to personal injury and/or loss of property, it becomes the responsibility of the user / installer / electrical system designer to incorporate safety devices (such as relays, flow switch, thermal protections, etc) and/or an alarm system to protect the entire system against such catastrophic failures. Tampering with the devices or unintended application of the devices will result in a void of warranty. 5 | 028-0485-00 November 2017 BI 1 Binary input #1 function: Remote NSB timer clock input. The scheduling will now be set as per the binary input. It provides low cost setback operation via a dry contact: • Contact opened = Occupied • Contact closed = Unoccupied UI 3 Supply air sensor: Used for supply air temperature control. T ERMINAL I DENTIFICATION AND F UNCTION Pin Number Pin Identification Description 4 24 V ~ HOT Power 24 Vac 5 24 V ~ COM Common 6 Do not use 7 AUX 24 Vac pulsed output 9 AO 2 0 to 10 Vdc analog output 10 AO 1 8 Vdc pulsed output 12 BI 1 Night setback input 13 RS Remote sensor 14 S COM Sensor common 16 UI 3 Supply sensor 6 | 028-0485-00 November 2017 Output Types Type of Output Controlled Device Modulating analog 0 to 10 Vdc output SCR’s power controls Vdc pulsed output 4-32 Vdc triggered SSR’s Vac pulsed output 24 Vac triggered SSR’s 7 | 028-0485-00 November 2017 Wiring 24 0 to 10 Vdc 24V~ COM AUX AO 2 AO 1 BI 1 S COM UI3 24V~ HOT RS Supply temperature control with 0 to 10Vdc SCR and override input By closing contact on BI 1, will force setpoint to « Unocc HT » adjustable inside setup parameters. By adjusting to a low setpoint (ex: 0°F) is a way to disable heating. By adjusting to 180°F, is a way to force maximum heating. If parameter « MenuScro » = On, will display « Unoccup » when contact closed and « Occupied » when contact open. 24V 0 24V~ COM AUX AO 2 AO 1 BI 1 S COM UI3 24V~ HOT RS Return temperature control with 0 to 10Vdc SCR 8 | 028-0485-00 November 2017 24VSSR + - (see wiring detail) 24V~ COM AUX AO 2 AO 1 BI 1 S COM UI3 24V~ HOT RS 24V~ COM AUX AO 2 AO 1 BI 1 S COM UI3 24V~ HOT RS Wiring detail for 4x 4-32 Vdc SSR 24VSSR + - (see wiring detail) 24V~ COM AUX AO 2 AO 1 BI 1 S COM UI3 24V~ HOT RS 24V~ COM AUX AO 2 AO 1 BI 1 S COM UI3 24V~ HOT RS Wiring detail for 4x 4-32 Vdc SSR 9 | 028-0485-00 November 2017 24V + - Room remote temperature control with 4-32Vdc SSR 24V~ COM AUX AO 2 AO 1 BI 1 S COM UI3 24V~ HOT RS 1x, 2x or 3x remote sensors for averaging room temperature reading (see S3010W1000 manual for proper settings) Next >