Trane Voyager Commercial - Page 139

RT-SVX34C-EN 139
Diagnostics
Table 77. Troubleshooting
SYMPTOM PROBABLE CAUSE RECOMMENDED ACTION
A. Unit will not operate.
No Heat, No Cool or No
Fan operation.
1. No power to the Unit. 1. Check line voltage at service disconnect.
2. No power to the RTRM. 2. Check for 24 VAC at RTRM J1-1 to system ground.
3. Zone Sensor Module (ZSM) is
defective or MODE circuit is open.
(VAV only)
3. See Zone Sensor Module (ZSM) Test Procedures or
short MODE input on VAV units.
4. RTRM is defective.
4. If 24 VAC is present at the RTRM J1-1 to ground, the
LED on the RTRMshould be on. If the LED is not lit,
replace the RTRM.
5. Supply Fan Proving (FFS)
switch has opened.
5. Check the IDM and belts, replace as necessary.
6. Emergency Stop input is open. 6. Check the Emergency Stop input.
CV Units Only
B. Unit will not Heat or
Cool, but the Fan
switch operates.
1. Zone Sensor Module (ZSM) is
defective.
1. Refer to the Zone Sensor Module (ZSM) Test
Procedures.
2. Problem in (ZSM) wiring.
2. Disconnect the ZSM wiring at RTRM and test the
wires using the Zone Sensor Test Procedures to locate
any wiring problems.
3. RTRM is defective.
3. Disconnect the ZSM wiring at the RTRM and perform
the Zone Sensor Module (ZSM) Test Procedures. If
within range, replace RTRM.
CV or VAV (Unoccupied)
C. Unit heats and cools, but
will not control to set point.
1. Zone Sensor Module (ZSM) is
defective.
1. Refer to the Zone Sensor Module (ZSM) Test
Procedures.Refer to the Default Chart.
2. Thermometer on the ZSM out
of calibration.
2. Check and calibrate the thermometer.
D. CPR1 will not operate,
ODM's will operate.
1. Compressor failure.
1. Test compressor, mechanically and electrically.
Replace if necessary.
2. Wiring, terminal, or
mechanical CC1 contactor
failure.
2. Check wires, terminals and CC1. Repair or replace
if necessary.
3. LPC1 has tripped
3. Leak check, repair, evacuate and recharge as
necessary. Check LPC1 operation.
E. CPR1 operates, ODM's will
not operate.
1. ODM has failed. 1. Check ODM's, replace if necessary.
2. ODM capacitor(s) has failed. 2. Check ODM capacitors, replace if necessary.
3. Wiring, terminal, or
mechanical CC1 or CC2 contactor
failure.
3. Check wires, terminals ,CC1 and CC2. Repair or
replace if necessary.
4. ODF 20 or 34 relay has failed
4.Check for proper voltage and contact closure.
ODF20 and 34 have a 24 VAC holding Coil. If voltage
is present, replace relay.
5. RTRM is defective
5. Locate the P3 connector on the RTRM. Check for 24
VAC at terminal P3-6. If 24 VAC is not present, replace
RTRM.