The ZP4-ESP is a 4 zone universal zone control panel that includes integrated ESP static pressure
control logic designed to eliminate the need for a conventional bypass damper when used with 3-wire
zone dampers. The panel is capable of handling up to 2 stages of conventional heating and cooling or
3 stages of heating and 2 stages of cooling for heat pump and fossil fuel applications.
SEQUENCE OF OPERATION
The panel allows a single HVAC unit to have up to four separate zones. Each zone is controlled by its
own thermostat. When a zone thermostat calls for heating or cooling, the zones not calling will have
their dampers powered closed, and the zones calling will have their dampers powered opened. The
heating or cooling equipment will also be brought on.
As zone dampers open and close, the ZPA-SPS Static Pressure Sensor continuously monitors the
system static pressure. If the static pressure goes above the static pressure setpoint, the panel will
send a signal to all selected non-calling zone dampers to start to open to a point where the static
pressure setpoint is maintained. The ESP LED will come on with the non-calling zone LEDs until the
static pressure reaches setpoint. The small amount of air allowed to bleed into non-calling zones
eliminates air noise and assures proper airflow through the HVAC system. This also prevents coil
freeze up and high temperature issues.
DESIGN AND INSTALLATION GUIDLINES
[ ] Zone control begins with good
design.
HVAC
[ ] Proper load calculations used to determine duct and equipment sizing are essential in achieving
optimum performance.
[ ] Install zone thermostats in their respective zones.
[ ] System wires should be tagged to match the panel terminal designations and zone
identification.
[ ] Zone dampers should be installed at least 10’ back from discharge air grills whenever possible.
[ ] Zone dampers need to be located where they can be accessed for trouble shooting.
[ ] Flex or lined duct is recommended on the last 5’ of each branch run.
[ ] Thermostats and zone dampers can typically be located up to 300’ from the control panel when
18
copper thermostat wire is used.
AWG
[ ] Always use a separate 24
transformer rated at the proper
to power the panel, zone
VAC
VA
dampers and thermostats.
[ ] Never use the equipment transformer regardless of its
rating.
VA
[ ] When using forced air zoning with a variable speed
system, high speed fan should be set
HVAC
at 400
per ton of cooling.
CFM
Summary of Contents for ZP4-ESP
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