Install Instructions

SEQUENCE OF OPERATION
The Aprilaire 6000 Series Zone Control System 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.
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 system 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 limit settings 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 can either downstage or interrupt the heating/cooling equipment before
overheating/freezing occurs.
When Downstage On DAT is set to Yes, if the discharge air temperature comes within 5°F of the HIGH DAT LIMIT or LOW DAT LIMIT setting, the
system will go to the next lowest equipment stage, if it is not already in first stage heating or cooling. The system will remain in this lower stage until
the discharge air temperature is 10°F from the HIGH DAT LIMIT or LOW DAT LIMIT setting. When the discharge air temperature reaches the HIGH DAT
LIMIT or LOW DAT LIMIT the system will interrupt the heating/cooling call. When the interrupt occurs the system ends the heating/cooling call and
energizes the fan terminal (if not already energized). The 6000 Series Control will display the status of the interrupt on the Status screen. Once the
temperature drops/rises 10°F, the high/low temperature interrupt will end and the heating/cooling call to the equipment can resume.
EMERGENCY HEAT MODE
This feature can only be used with heat pump systems. The EM Heat button, on the control, can be used to enable Emergency Heat mode. When
Emergency Heat mode is enabled, any call for heat will be answered with auxiliary heat equipment and the heat pump will be locked out.
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 zone makes a call for heating, the 6000 Series Zone Control System will initiate a heating call to the equipment and close the dampers for all
zones that are not calling for heat. Following a 2-minute (heat/cool or auxiliary) or 4-minute (heat pump) minimum on time, the heating call will end
when (1) all zones stop calling for heating, (2) the call has exceeded the 20 minute heating/cooling changeover time limit while a cooling call exists or
(3) the call is interrupted because the discharge air temperature sensor reaches the DAT HIGH LIMIT setting.
COOLING OPERATION
When a zone makes a call for cooling, the 6000 Series Zone Control System will initiate a cooling call to the equipment and close the dampers 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 has reach the DAT LOW LIMIT setting.
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