Viconics VTR7300 Installation Manual - Manual (Page 4)

4 | PIR Ready VTR7300 Series-Installation Guide
2 or 4 pipe only with electric reheat can be configured and wired for the following:
o Cooling only
o Heating only
o Cooling / Heating with network or local auto changeover
o On-Off electric reheat only
o Cooling with On-Off or modulating VDC pulsed electric reheat
( model dependent )
o Heating with On-Off or modulating VDC pulsed electric reheat
( model dependent )
o Cooling / Heating with network or local changeover with On-Off
or modulating VDC pulsed electric reheat ( model dependent )
 The VC3xxxX Relay Pack supplies power to the wall VTR73xxA Terminal
Equipment Controller.
 The VTR73xxA Controller controls the VC3xxxX Relay Pack(s) via a simple
communication bus.
 A maximum of 10 VC3xxxX Relay Pack can be used under a single VTR73xxA
Terminal Equipment Controller.
 3 wires minimum are required between the VTR73xxA Controller and the first
VR7300 Relay Pack.
 The 3 wire functions are known as the following:
o 1 Tx / Rx Communication
o 2 Power Hot 7.0 VDC 4 Watts maximum ( required for the
VTR73xxA Controller power )
o 3 Power common
 Commands for fan speed and valve operation are issued from the VTR73xxA
Terminal Equipment Controller to the VC3xxxX Relay Pack(s)