Trane Direct-Fired Indoor and Outdoor Make-Up Air Units, MUA-SVP01A-EN Functions

MUA-SVP01A-EN • Direct-Fired Indoor and Outdoor Units 19

The 100% Outside Air function automatically opens the outside air dampers and

closes the return air dampers. This 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. See the Typical Wiring Schematic and Multiplexed

Input sections of this manual for more information. The 100% Outside Air

function overrides all other damper control functions. See User Configured PID

Control for use with non-recirculating units.

To change the Minimum Ventilation requires the use of a BACview or PC. The

Minimum Ventilation function defines the minimum outside air percentage and

automatically prevents the dampers from modulating below this point. This

function can be used in heating or cooling mode. If the unit served by this control

is a direct-fired heater, that recirculates air before the burner, and is operating in

the heating mode, the unit will automatically keep the minimum outside air at

20%. If the outside air drops below 20%, the burner will cycle off. To specify the

Minimum Ventilation scroll through the menu tree, locate the Setpoints branch

and select Min Vent, and enter the desired outside air percentage. The allowable

range is 0% - 100% outside air.

To change the Minimum Ventilation requires the use of a BACview or PC. The

Freezestat function automatically cycles the unit off if the supply air temperature

drops below the Freezestat setpoint for 3 continuous minutes. There is an initial

8-minute delay prior activation on recirculating units, and an initial 6-minute

delay on non-recirculating units. The Freezestat function prevents the unit from

starting. The default for this setpoint is 45°F. To change the Freezestat setpoint

scroll through the menu tree, locate the Setpoints branch, select Freezestat SP,

and enter a new temperature. The allowable temperature range is 35°F - 50°F.

An optional clogged filter switch is required for this function. The Clogged Filter

function automatically notifies the user of a dirty filter condition. A Clogged Filter

indication will appear on the remote panel or local user interface. This 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. See the Typical

Wiring Schematic and Multiplexed Input sections of this manual for more

information.

Functions