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16 Direct-Fired Indoor and Outdoor Units • MUA-SVP01A-EN
Unit Operating Modes
To change the desired cooling 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 cooling room temperature of an MRT-Expert control
system, scroll through the SETPOINTS menu tree using the BACview, locate the
Occupied Cooling Setpoint, and enter a new temperature. The allowable
temperature range is 61°F - 96°F. The burner will modulate using a PID loop to
maintain this temperature.
Additionally, on all controls systems except the MDT the control system cycles
the cooling output 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 CLG MIN DA Setpoint, and enter a
new temperature. This temperature must not be greater than the CLG MAX DA
Setpoint. The allowable temperature range is 55°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 CLG MAX DA Setpoint, and enter a
new temperature. This temperature must not be less than the CLG MIN DA
Setpoint. The allowable temperature range is 55°F - 130°F. This sets the highest
discharge air temperature that will leave the unit.
If the maximum and minimum discharge temperature setpoints are set for the
same temperature, the supply air temperature will be the same as the setpoint
regardless of the room temperature setpoint or actual room temperature.
Damper Control Modes
There are four different modes that control the unit damper operation: Manual,
Mixed Air Temperature, Building Pressure, and 100% Outside Air. Except for the
100% Outside Air mode, these operating modes are selected through the menu
tree of the local user interface or PC. Not all damper modes are available on all
units.
Manual Mode
Manual Mode is the default damper operational mode. This will set the outside
air damper to a fixed position.
MDT and MRT Controls. To place the damper operation in Manual Mode on an
MDT or MRT control system be sure the appropriate terminals in the unit control
panel are not shorted. See the Typical Wiring Schematic and Multiplexed Input
sections of this manual for more information. Rotate the damper control knob on
the remote panel to the desired percentage of outside air. If the unit served by
this control is a direct-fired heater, that recirculates air before the burner, and is