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12 Direct-Fired Indoor and Outdoor Units • MUA-SVP01A-EN
Unit Operating Modes
function is activated whenever a contact is closed between the appropriate
terminals on the unit's terminal strip located in the unit's main control panel.
Heating and cooling functions use the Night Setback Setpoints. See the Typical
Wiring Schematic and Multiplexed Input sections of this manual for more
information. This function can be used with a twist timer, toggle switch, door
switch, exhaust fan interlock, or any other dry contact to override the time clock
schedule.
Heating/Ventilating/Cooling Operating Modes
The AdaptAire DDC controller automatically switches between the heating,
ventilating and cooling modes of operation.
Heating Mode
Heating Mode allows the burner to operate as needed and is activated whenever
the room temperature is 2° below the heating setpoint.
General Burner Control
In the Heating Mode the burner will modulate to maintain a constant
temperature. To change the desired heating discharge or room temperature of an
MDT or MRT control system, rotate the temperature setpoint knob on the remote
panel clockwise to the desired temperature.
To change the desired heating room temperature of an MRT-Pro control system,
depress the Warmer button to increase the desired room temperature setpoint or
depress the Cooler button to decrease the desired room temperature setpoint.
Each push of a button changes the temperature setpoint by 1°F. The setpoint can
be changed a maximum of ±10°F from the default of 72°F.
To change the desired heating room temperature of an MRT-Expert control
system, scroll through the SETPOINTS menu tree using the BACview, locate the
Occupied Heating Setpoint, and enter a new temperature. The allowable
temperature range is 55°F - 90°F. The burner will modulate using a PID loop to
maintain this temperature.
Additionally, on all controls systems except the MDT the control system
modulates the burner to maintain the supply air temperature within a defined
operating window. This window defines the maximum and minimum discharge
temperatures.
To change the desired minimum supply or discharge air temperature scroll
through the SETPOINTS menu tree, locate the HTG MIN DA Setpoint, and enter a
new temperature. This temperature must not be greater than the HTG MAX DA
Setpoint. The allowable temperature range is 40°F - 130°F. This sets the lowest
discharge air temperature that will leave the unit.
To change the desired maximum supply or discharge air temperature scroll
through the SETPOINTS menu tree, locate the HTG MAX DA Setpoint, and enter
a new temperature. This temperature must not be less than the HTG MIN DA