1
SYSTEM 2000
CONCEPTUAL
DRAWING ONLY
Refer to System 2000
Controller Section for
Wiring Information
System 2000
Zonex Systems Supplied Components
System Controllers ..............................................................Pages 3- 7
Zone Thermostats ...............................................................Pages 16-17
Zone Dampers ....................................................................Pages 18-23
Bypass Dampers .................................................................Pages 23-27
Capacity Controllers ............................................................Pages 28-41
System 2000
Field Supplied Components
Thermostat Wire ........................................................................Page 41
24V Transformers and Fuse .......................................................Page 42
SYSTEM OPERATION
The System Controller communicates with the Zone Dampers and Zone
Thermostats via a patented Five-Wire Link. The Five-Wire Link is daisy
chained from damper to damper using standard five-conductor
thermostat wire. The System Controller polls every zone every 120 sec-
onds and registers the number of thermostats calling for heating and
cooling. The System Controller then runs the HVAC/Heat Pump unit in the
mode with the most calls. If the majority changes, the System Controller
will automatically change over to the new mode of operation.
The Zone Dampers are open for the zones calling and closed for the
zones not calling for the operating mode. When the HVAC/Heat Pump unit
is not running, all Zone Dampers are open to provide ventilation if the
indoor blower fan is running continuously.
While the unit is running, the Capacity Controller monitors the leaving air
temperature from the unit and will cycle the HVAC/Heat Pump unit off
and on to maintain the air temperature within a preset range to eliminate
coil freeze-up and premature heat exchanger failure.
The System 2000 is a light commercial/residential zone control system.
It enables a single HVAC unit to be controlled by up to twenty zone (room)
thermostats. System 2000 is a vote based, auto changeover system. The
system operates on a first call, first served majority wins on changeover
strategy. To provide economical, effective and simplified remote control
and monitoring capability of one or more System 2000 zone control sys-
tems, the ZonexCommander may be used to manage up to 80 thermostat
schedules. The ZonexCommander is a Window’s based thermal manage-
ment system, which can integrate gas/electric and heat pump zone sys-
tems to include stand alone HVAC systems.
For modulating communi-
cating control, use the ZonexCommander (Plus).
