Troubleshooting - Trane Voyager Commercial Installation, Operation And Maintenance Manual

Troubleshooting

Table 79. Troubleshooting
SYMPTOM
A. Unit will not operate. No Heat, No
Cool or No Fan operation.
CV or SZ VAV Units only
B. Unit will not Heat or Cool, but the
Fan switch operates.
CV, SZ VAV or VAV (Unoccupied)
C. Unit heats and cools, but will not
control to set point.
D. CPR1 will not operate, ODM's will
operate.
E. CPR1 operates, ODM's will not
operate.
F. CPR1 and ODM1 will not operate.
RT-SVX34R-EN
PROBABLE CAUSE
1. No power to the Unit.
2. No power to the RTRM.
3. Zone Sensor Module (ZSM) is defective or MODE
circuit is open. (VAV only)
4. RTRM is defective.
5. Supply Fan Proving (FFS) switch has opened.
6. Emergency Stop input is open.
1. Zone Sensor Module (ZSM) is defective.
2. Problem in (ZSM) wiring.
3. RTRM is defective.
1. Zone Sensor Module (ZSM) is defective.
2. Thermometer on the ZSM out of calibration.
1. Compressor failure.
2. Wiring, terminal, or mechanical CC1 contactor
failure.
3. LPC1 has tripped
1. ODM has failed.
2. ODM capacitor(s) has failed.
3. Wiring, terminal, or mechanical CC1 or CC2
contactor failure.
4. ODF 20 or 34 relay has failed
5. RTRM is defective
1. No power to CC1 coil. Possible Cool Failure
2. CC1 coil defective. Cool Failure Indicated.
3. CC1 contacts defective.
4. RTRM is defective.
5. LPC1 has tripped
RECOMMENDED ACTION
1. Check line voltage at service disconnect.
2. Check for 24 VAC at RTRM J1-1 to system ground.
3. See Zone Sensor Module (ZSM) Test Procedures or
short MODE input on VAV units.
4. If 24 VAC is present at the RTRM J1-1 to ground,
the LED on the RTRM should be on. If the LED is not
lit, replace the RTRM.
5. Check the IDM and belts, replace as necessary.
6. Check the Emergency Stop input.
1. Refer to the Zone Sensor Module (ZSM) Test
Procedures.
2. Disconnect the ZSM wiring at RTRM and test the
wires using the Zone Sensor Test Procedures to
locate any wiring problems.
3. Disconnect the ZSM wiring at the RTRM and
perform the Zone Sensor Module (ZSM) Test
Procedures. If within range, replace RTRM.
1. Refer to the Zone Sensor Module (ZSM) Test
Procedures.Refer to the Default Chart.
2. Check and calibrate the thermometer.
1. Test compressor, mechanically and electrically.
Replace if necessary.
2. Check wires, terminals and CC1. Repair or replace
if necessary.
3. Leak check, repair, evacuate and recharge as
necessary. Check LPC1 operation.
1. Check ODM's, replace if necessary.
2. Check ODM capacitors, replace if necessary.
3. Check wires, terminals,CC1 and CC2. Repair or
replace if necessary.
4.Check for proper voltage and contact closure.
ODF20 and 34 have a 24 VAC holding Coil. If voltage
is present, replace relay.
5. Locate the P3 connector on the RTRM. Check for
24 VAC at terminal P3-6. If 24 VAC is not present,
replace RTRM.
1. Check wiring, terminals and applicable controls
(CCB1, HPC1, TDL1, WTL1, LPC1)
2. Check CC1 coil. If open or shorted, replace CC1.
3. If 24 VAC is present at CC1coil, verify contact
closure.
4. If 24 VAC is not present at CC1 coil, reset the Cool
Failure by cycling the main power disconnect switch.
Verify system MODE is set for cooling operation. If no
controls have opened, and CC1 will not close, replace
RTRM.
5. Leak check, repair, evacuate, and recharge as
necessary. Check LPC1 operation.
D D i i a a g g n n o o s s t t i i c c s s
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