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Trane Direct-Fired Indoor and Outdoor Make-Up Air Units, MUA-SVP01A-EN FAULT CODE: Safety Circuit Open

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MUA-SVP01A-EN • Direct-Fired Indoor and Outdoor Units 29

Diagnostics

–Yes . This signal is fed to the signal conditioner. Disconnect the wires from

the signal conditioner's input signal terminals and measure the voltage on

the wires. Is it the same as the voltage coming from the controller?

– No. There is an open in the wiring from the controller output. Correct

wiring and reconnect the wires to the terminals on the signal

conditioner. Be sure the wire from the controller's ground terminal is

connected to the signal conditioner's ground terminal.

– Yes. Continue.

5. Is there 24VAC on the signal conditioner power terminals?

–No. Determine cause and rectify.

–Yes . Continue.

6. Is there twice the DC voltage on the signal conditioner's output terminals as

there is on the signal conditioner's input terminals?

–No. Replace the signal conditioner.

–Yes . Continue.

7. Is the DC voltage on the modulating valve terminals the same as the DC

voltage on the signal conditioner's output terminals?

–No. There is a break in the wiring between the signal conditioner and the

modulating valve terminals. Determine cause and rectify.

–Yes . The electronics are working to this point. Continue.

8. Is there sufficient temperature rise for the amount of outside air that is being

delivered to the space?

–No. Follow the instructions in this manual for placing the unit in Manual

damper control mode. Adjust the Man. Vent setpoint to 20% outside air. Is

there sufficient temperature rise for the amount of outside air that is being

delivered to the space?

– No. Contact the factory.

– Yes. Continue.

–Yes . Continue.

9. Verify there is sufficient inlet gas pressure. Verify the modulating valve is

properly adjusted. Verify the burner orifices are clear of obstruction. Contact

the factory.

FAULT CODE: Safety Circuit Open

PROBLEM:The controller has detected a failure in the safety circuit.

SOLUTION: If fan is not running (check prior alarm log)

1. Is there a prior alarm such as Unit On/Fan Off or Airflow Sw?

–Yes . See the Diagnostic section for the previous alarm.

–No. Continue.

2. Set Unit Mode to Manual. Did fan start?

Contents

Main Overview NETWORKING ADAPTAIRE DEFAULT SETTINGS Page Contents Unit Operating Modes Functions Diagnostics Menu Selection Contents Thermostat Output Curve Airflow Station Layout I/O Zone 583 Controller Specifications Typical Wiring Schematic Unit Operating Modes MDT Controls: MRT Controls: MRT-Pro Controls: Page MRT-Expert Controls: Page Heating/Ventilating/Cooling Operating Modes Heating Mode General Burner Control Page Ventilation Mode Cooling Mode Figure 1. Cooling Mode Damper Control Modes Manual Mode Mixed Air Temperature Mode Building Pressure Mode Functions 100% Outside Air Minimum Ventilation Freezestat Clogged Filter User Configured PID Control DIRECT ACTING Page REVERSE ACTING Page Unit Resets Multiplexed Inputs Clock Set Diagnostics Critical Fault Codes FAULT CODE: Low Discharge Temperature Page SOLUTION: If burner was not operating prior to shutdown (check prior alarm log) FAULT CODE: Safety Circuit Open SOLUTION:If fan is running (check prior alarm log) FAULT CODE:Burner Status FAULT CODE: Burner Hand FAULT CODE: Flame Failure Diagnostics - Non-Critical Fault Codes FAULT CODE: Unit off/Fan on SOLUTION: If fan is running SOLUTION: If fan is not running FAULT CODE:Unit on/Fan off SOLUTION:If fan/motor is running SOLUTION: If fan/motor is not running FAULT CODE: Check Airflow Switches SOLUTION:If high airflow switch is opening. Do not adjust the switch setpoints SOLUTION:If low airflow switch is opening. Do not adjust the switch setpoints FAULT CODE: Clogged Filter Switch SOLUTION:If clogged filter switch is closing. FAULT CODE:Energy Save Mode 1 SOLUTION:If setpoints are misadjusted SOLUTION:If setpoints are not misadjusted FAULT CODE:Energy Save Mode 2 SOLUTION: If OAT, RoomT or DAT are such that heat is required FAULT CODE:Energy Save Mode 3 SOLUTION: If OAT, RoomT or DAT are such that heat is required SOLUTION: If setpoints are misadjusted FAULT CODE:Insufficient OA SOLUTION:If heat is desired SOLUTION:If less outside air is desired Page Menu Selection Tree for BACview UNIT MODES HOTKEY - 2 Menu Selection Status Alarm SET POINTS HOTKEY - 3 STATUS MENU HOTKEY - 4 Note: The Status Menu always displays the current status of the fan, burner and cooling. ALARM HOTKEY - 1 Alarm History (64 Most Recent) RESETS HOTKEY - 6 SCHEDULES HOTKEY- 7 USER CONFIGURABLE OUTPUT HOTKEY - 8 CLOCKSET HOTKEY - 0 HELP HOTKEY - 5 FUEL SELECT HOTKEY - 9 10 K Ohms Thermistor Output Curve Thermostat Output Curve Resistance (Ohms) Typical 10,000 Ohm Thermistor Output Curve Resistance (Ohms) Typical 10,000 Ohm Thermistor Output Curve Page I/O Zone 583 Controller Specifications I/O Zone 583 Controller Specifications OUTPUT ASSIGNMENTS - ANALOG RNET MRT-Pro or Room Air sensor OUTPUT ASSIGNMENTS - DIGITAL INPUT ASSIGNMENTS - UNIVERSAL