Sequence of Operation:
The Green Zone™ Z-300-HPS is a residential /
light commercial zone control system that allows
a single HVAC unit to have up to three separate
zones. Each zone is controlled by its own space
thermostat and motorized zone damper. If a zone
thermostat calls for heating or cooling, the zones
not calling will have their dampers powered
closed, and the zone calling will have its damper
opened. The heating or cooling equipment will
also be brought on at the same time. When the
zone calling is satisfied, the heating or cooling
equipment turns off. If one zone calls for heating
and another zone calls for cooling, the first zone to
call receives priority. When the first call is
satisfied, the system will changeover and take
care of the opposite call. If a zone being served
(heating or cooling) has not been satisfied within
20 minutes while an opposite call is taking place,
the system will changeover. When the zone is
satisfied or 20 minutes has elapsed, the system
will again changeover if an opposite call exists.
This is referred to as Auto Changeover - First Call
Priority - Time Share. In the event of a tie, cooling
will receive priority. The changeover valve only
changes position when the mode of operation
changes.
High and Low Limit Protection:
The Z-300-DAS Discharge Air Sensor should be
mounted on the discharge air plenum of the
HVAC unit and wired to the DAS terminals on the
panel. If the heating temperature rises above
140° F (160° F when fossil fuel is selected) or if
the cooling temperature falls below 45° F, the
sensor will cycle the equipment, while the fan
continues to run. When the system goes out on
low limit a 3 minute time delay is activated before
cooling is allowed to energize (providing the
discharge air temperature has risen above 45°
F). LIMIT LED blinks when high or low limit is
reached.
Ventilation Mode:
Zone ventilation is established by the individual
zone thermostat fan setting. Any thermostat set
in the fan AUTO mode will not receive ventilation
air when there are no heating or cooling calls.
Any thermostat set in the fan ON mode will
receive ventilation air whenever there are no
heating or cooling calls taking place.
Power Requirements:
The Z-300
requires
a separate
24 Vac
transformer. A 40 VA transformer will power the
panel and up to four (4) dampers. A 75 VA
transformer will power the panel and up to seven
(7) dampers. If more than three (3) dampers for
an individual zone are required, a RY-1-HB relay
should be used with an additional properly sized
transformer.
Jackson
Systems
HD-XXXX
rectangular and D-XX round dampers are
powered closed / spring return open. Damper
actuators are rated at 10 VA. If 3-wire dampers
(powered open / powered closed) are installed,
VA ratings will vary depending on the damper
actuator used.
Wiring:
All wiring should be conventional 18 gauge
thermostat wire. Thermostats and zone dampers
may be located up to 300 feet from the Z-300
panel.
Z-300-HPS Installation and Operation Instructions
3 Heat / 2 Cool Heat Pump with Fossil Fuel option
Auto Changeover - First Call Priority - Time Share
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Zone Control Made Simple
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