The Zonex Systems Digitract 4-2 zoning system enables up to four room thermostats to control a single HVAC system. This permits superior building
temperature control over a standard single thermostat. To provide economical, effective and simplified remote control and monitoring capability of
one or more Digitract 4-2 zone control systems, the ZonexCommander may be used to manage up to 80 thermostat schedules. The ZonexCommander is
a Windows
®
based thermal management system, which can integrate gas/electric and heat pump zone systems to include stand alone HVAC systems.
INTRODUCTION
SYSTEM DESCRIPTION
The DigiTract 4-2 zoning system consists of a 2-stage System Controller
with built-in Capacity Control (leaving air sensor), Zone Dampers, Zone
Thermostats, Bypass Damper and Damper Transformer.
The System Controller is the heart of the Digitract 4-2 zoning system.
It monitors the leaving air temperature, zone thermostats and controls the
HVAC System and zone dampers. See pages 6 to 10 for further information.
The Leaving Air Sensor (LAS) is part of the staging and capacity control
feature of the System Controller. It is a sensor placed in the leaving air
of the HVAC system. The LAS monitors the leaving air temperature of the
HVAC system and sends this information to the System Controller. The
System Controller uses this information to stage and temporarily cycle
the HVAC system off if the leaving air gets too hot in heat mode or too cold
in cool mode. For heat pumps, this information is also used to control the
auxiliary heat to maintain a minimum supply air temperature of 88
degrees. See Capacity Controller section, page 11, for further information.
The Zone Dampers are air valves placed in the forced air duct work
for each zone. They are controlled by the System Controller. While the
HVAC system is running, the zone dampers for any zone thermostats not
calling will close and zone dampers for the zones calling will remain
open. Conditioned air is only directed to the zones needing it. See pages
14 to 18 for further information.
The Zone Thermostats monitor the room temperature of each zone
and compare it to the heat and cool setpoints stored in them. If the room
temperature drops below the heat setpoint, the zone thermostat makes
a heat call telling the System Controller that zone needs heating. If the
room temperature rises above the cool setpoint, that thermostat makes
a cool call telling the System Controller that zone needs cooling.
Two-stage thermostats are not required with the DigiTract 4-2 System.
The System Controller will cycle staging and auxiliary strip heat based on
leaving air temperature. See pages12 to 13 for further information.
The Bypass Damper is a pressure relief valve placed between the
supply and return ducts of the forced air duct work. As zone dampers
start closing, the bypass damper will open and divert some of the supply
air to the return. This prevents a pressure buildup in the supply duct
which can cause fan cavitation, excessive air velocities, and excessive
zone damper blow-by. See pages 18 to 22 for further information.
Damper Transformer. Wired to TR1 and TR2 on the System Controller.
Powers the zone dampers only. Requires an in-line fuse. See Damper
Transformer section, page 23.
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