DCN 141-01064 -06 1/02/09
2
OPERATION
The ZCV2 HVAC Zone Control Unit provides two independent heating and cooling zones when connected
to a single HVAC system. Each zone can be controlled by a “Wall Display Unit” or, if preferred, simply by
a wall mounted temperature sensor. Zonal temperature control is accomplished by controlling motorized
zone dampers to open or close the flow of conditioned air into each zone. The ZCV2 also has an RS485
communications port for connecting to control networks and controllers, such as the RCS CommStar
products.
The ZCV2 uses RCS Wall Display Units (WDU), which are similar looking to typical “thermostats”, but are
digital communicating multi-function user interfaces with graphical displays, user controls and a local
temperature sensor.
Please note that you cannot use standard thermostats with the ZCV2 HVAC Control Unit, only RCS
TS16 or TS40 Wall Display Units can be connected to it.
Installation of the ZCV2 control unit is easy. The control unit connects to the HVAC system’s thermostat
connections just like a traditional thermostat does. The Wall Display Units connect to the ZCV2 with a 4
wire cable. Each Zone damper is a two wire connection (or three wire for optional heavy duty dampers).
The ZCV2 will take care of providing the heating or cooling as needed to satisfy each zone’s
requirements.
Fully Independent Zone Control
Operation of the system is just like having two independent thermostats. Set each zone to the
heating/cooling mode desired and adjust the zone temperature as needed. The ZCV2 will automatically
delivery the heating/cooling needed to satisfy each zone’s requirement. Mixed modes are allowable
among the zones, that is, one zone may be set to heating while another may be set to cooling. The system
is fully automatic and has auto changeover capability. Heating calls are give priority over cooling calls.
The Zone Control Unit monitors the setpoint and modes of all zones and determines what heating calls will
be satisfied first and when all heating calls are satisfied, the system mode will switch to cooling to satisfy
all cooling calls as needed.
HVAC System Compatibility
Standard or Heat Pump HVAC System Types The ZCV2 can work with either standard Gas/Electric or
Heat Pump HVAC systems. System type is selectable on the control board.
For Standard HVAC systems, the ZVC2 can be set to work with either Gas heating or Electric heating.
For Heat Pump HVAC systems, the ZCV2 changeover valve operation can be set for either changeover
with cooling or changeover with heating.
Multi-Stage HVAC Compatibility
For Standard HVAC systems, the HVAC outputs support 2 stages of heating and 2 stages of cooling.
For Heat Pump HVAC systems, the HVAC outputs support 3 stages of heating (2 compressor/1 heatstrip)
and 2 stages of cooling.
Fresh Air Ventilation
The ZCV2 includes the “Smart Vent” feature which provides automatic fresh air ventilation. The Smart
Vent operation is controlled from the TS40 Wall Display Unit and provides several modes of manual,
timed and automation vent operation. A vent damper relay output is provided for control of a fresh air
intake damper.
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