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)
