Trane Voyager Commercial - Troubleshooting Common Issues; Unit Will Not Operate; Unit Will Not Heat or Cool (Fan Operates); Unit Operates but Does Not Control to Setpoint

RT-SVX34C-EN 137
Diagnostics
Note: If voltage is incorrect, verify RTAM DIP switch settings.
2. If the voltage to the IGV/VFD is not present, verify that the wires are properly connected between
the RTRM or COMM (Communications Module) and the RTAM.
If Step 2 checks out and the voltage is still not present at the IGV/VFD output, replace the RTAM.
Test 2
Testing the Static Pressure Transducer (SPT) Input
1. With main power to the unit turned "Off", disconnect all of the tubing to the Static Pressure
Transducer.
2. With the system MODE "Off", apply power to the unit and measure the voltage between J1-4
and J1-1 on the RTAM. The voltage should be approximately 5 VDC. If not, check the wiring
between the RTRM and the RTAM. If the wiring checks good, replace RTAM.
3. Measure the voltage between J1-3 and J1-1 on the RTAM. The voltage should be approximately
0.25 VDC. If not, check the wiring between the RTAM and the SPT. If the wiring checks good,
replace the SPT.
4. Apply 2.0" w.c. pressure to the HI port on the static pressure transducer (SPT). Measure the
voltage between J1-1 and J1-3. The voltage should be 1.75 (± .14) VDC. If not, replace the SPT.
Note: The SPT is susceptible to interference from VFD’s. Make sure the SPT is mounted on plastic
standoffs and is not touching any sheet metal.
Test 3
Testing the VAV Setpoint Potentiometers
Turn the main power disconnect switch "OFF". Check each potentiometer listed in the table below
by measuring resistance. These potentiometers are built into the RTAM and are not replaceable.
Test 4
Testing the Inlet Guide Vane Actuator (IGVA)
1. Using the "Step Test Mode" procedure described in the "Unit Startup" section (Step 1 for VAV).
Measure the voltage between the (+) and (-) terminals on the actuator. The voltage should be
8.5 VDC. If not, check the wiring between the RTAM and the IGV actuator. If the wiring checks
good, return to Test 1.
2. If the voltage above is present and the actuator is not opening, verify that 24 VAC is present
between terminals T1 and T2. If the voltage is present, replace actuator.
Note: The IGVA can manually be driven open by shorting the (F) terminal to either the (+) or (-)
terminals. The IGVA will drive closed when the short is removed.
Static Pressure Setpoint 0-560 ohms (Approximate) RTAM J7-1,2
Static Pressure Deadband 0-560 ohms (Approximate) RTAM J7-7,8
Reset Setpoint 0-560 ohms (Approximate) RTAM J7-11,12
Reset Amount 0-560 ohms (Approximate) RTAM J7-5,6
Morning Warmup Setpoint 0-560 ohms (Approximate) RTAM J7-9,10
Supply Air Cooling Setpoint 0-560 ohms (Approximate) RTAM J7-3,4
Supply Air Heating Setpoint 0-560 ohms (Approximate) RTAM J7-13,14