HEAT/COOL CHANGEOVER
When a call for heating/cooling exists and an opposing call is made
from another zone, a changeover time limit of 20 minutes begins at the
time that the opposing call is made. If the original call is not satisfied
within that 20-minute time period, the call will be interrupted, and the
zone panel will turn the equipment off and complete the normal fan
purge cycle and minimum equipment off time. The opposing call will
then be answered. After 20 minutes, if the original call still exists, the
opposing call will be interrupted and the original call can once again be
recognized.
DISCHARGE AIR TEMPERATURE (DAT) SENSOR HIGH/LOW
TEMPERATURE LIMIT
The high/low temperature limits are designed to prevent the heat
exchanger from overheating or the cooling coil from freezing. An
8052 Sensor mounted in the supply duct senses the discharge air
temperature and will interrupt the heating/cooling equipment before
overheating/freezing occurs.
When the discharge air temperature reaches 160°F or 40°F the zone
panel will interrupt the heating/cooling call. When the interrupt occurs
the zone panel ends the heating/cooling call and energizes the fan
terminal (if not already energized). The Heating/Cooling LED on the
zone panel will flash during a high/low limit temperature interrupt. Once
the temperature drops/rises 10°F, the high/low temperature interrupt
will end and the heating/cooling call to the equipment can resume.
VACATION MODE
The Vacation mode button allows the homeowner to switch from
normal operation to Vacation mode. When Vacation mode is enabled
the thermostat in Zone 1 becomes the only zone from which a call
for heating or cooling is recognized. Additionally, when in Vacation
mode, all dampers remain in the open position. This feature allows the
homeowner to create a setback at a single thermostat and control the
whole home based on that thermostat. The Vacation LED will illuminate
when Vacation mode is enabled.
FAN OPERATION
A call for Fan from any zone will initiate the G equipment output
terminal. The dampers for all zones not calling for a continuous fan will
be closed during the fan call.
HEATING OPERATION
When a thermostat makes a call to the zone panel for heating, the
zone panel will initiate a heating call to the equipment and close the
damper for all zones that are not calling for heat. Following a 2-minute
minimum on time, the heating call will end when (1) all zones stop
calling for heating, (2) the call has exceeded the 20 minute heat/
cool changeover time limit while a cooling call exists or (3) the call is
interrupted because the discharge air temperature sensor reaches 160°F.
When the heating call ends the dampers will hold their position for 3-1/2
minutes before completing the purge. During purge the zone panel will
control the fan call to the equipment based on the thermostat inputs.
When a heating call ends, a minimum off time delay of 4 minutes must
elapse before another heating/cooling call can begin.
COOLING OPERATION
When a thermostat makes a call to the zone panel for cooling, the zone
panel will initiate a cooling call to the equipment and close the damper
for all zones that are not calling for cooling. Following a 4-minute
minimum on time, the cooling call will end when (1) all zones stop
calling for cooling, (2) the call has exceeded the 20 minute heating/
cooling changeover time limit while a heat call exists or (3) the call
is interrupted because the discharge air temperature sensor reaches
40°F. When the cooling call ends, the dampers will hold their position
for 3-1/2 minutes before completing the purge. During purge the zone
panel will control the fan call to the equipment based on the thermostat
inputs. When a cooling call ends, a minimum off time delay of 4
minutes must elapse before another heating/cooling call can begin.
TIME DELAY OVERRIDE
A Time Delay Override (TDO) button is available on the zone panel to
speed up the internal timer for system checkout.
SEQUENCE OF OPERATION
The 6203/6202 Zone Panel is for single stage conventional heat/cool applications. The zone panel is a heat call priority system with automatic
heating/cooling changeover after 20 minutes of operation. If two opposing (heating/cooling) thermostat calls exist while the system is idle, the
heating call will be satisfied first. A heat/cool thermostat is required in each zone.
Note that immediately after the board is powered, there is a four minute minimum off delay where only the fan output will respond.
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