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The easy zone 4 board has a number of advanced features to improve performance
and energy efficiency of the system while providing better control for the user.
The zone dampers will park in the last position when the equipment shuts down ready
for the next thermostat call. Should other zone make a call then the easy zone 4 will
permit the dampers to move to the correct position before passing the call onto the
equipment.
Damper parking
The easy zone touch will wait for dampers to move to the correct position before the
heating or cooling is started. It will also wait for a purge period before changing
equipment modes. This delay period is set by the SZ-4 main board.
Damper delay
If some zone(s) call for heating while other zone(s) call for cooling, the easy zone touch
will automatically alternate dampers and equipment modes every 20 minutes to
satisfy the needs of all zones. Equipment purge periods and delays will be used.
Time slicing
The SZ4 and Sz4/E will prohibit illegal thermostat calls and flash the “SOS” signal on the
status LED when any are detected. A table of possible thermostat calls are provided
below. Any thermostat making an illegal call will be rejected by the easy zone 4 and
expander board and only that zone making the prohibited call will be locked out. The
status LED will blink the “SOS” code. Other zones will function normally.
Equipment Rules
Permitted in heat cool mode (Sw2=Off)
Rejected in Heat Pump mode (Sw2=On)
Y Cool Only Rejected
Y & G Cool & Fan Permitted
G, Y & W Fan, cool & heat Rejected
Note: A standard HEAT COOL thermostat should be used with the easy zone 4 board
and expander card.
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