Trane Voyager Commercial Installation, Operation And Maintenance Manual page 138

D D i i a a g g n n o o s s t t i i c c s s
Table 79. Troubleshooting (continued)
SYMPTOM
G. ODM 3 and/or 4 will not cycle.
H. CPR2 and 3 (if applicable) will not
operate.
I. Indoor motor (IDM) will not operate
J. No Heat (YC's only) CFM will not
run, IP warms up, GV is energized
K. No Heat (YC's only) CFM runs, GV
energizes, IP does not warm up.
L. No Heat (YC's only) GV does not
energize, CFM runs, IP warms up
138
PROBABLE CAUSE
1. OAS has failed.
2. ODM3 and/or 4 capacitor has failed.
3. Wiring, terminal, or CC2 contactor failure.
4. ODM3 and/or 4 has failed.
5. RTRM is defective.
6. ODF20 has failed.
1. No power to CC2 and/or 3 coil. Cool Failure
Possible.
2. CC2 and/or 3 coil defective. Cool Failure Indicated.
3. CC2 and/or 3 contacts defective.
4. RTRM is defective.
5. DLT2 and DLT3 has tripped.
1. IDM has failed.
2. Wiring, terminal, or contactor failure.
3. ZSM is defective.
4. RTRM is defective.
5. Supply Fan Proving (FFS) switch has opened.
1. CFM has failed.
2. CFM capacitor has failed.
3. Wiring, or terminal failure.
4. TNS3 and/or 4 has failed. (460/575 V units only)
5. Modulating gas is not configured properly.
1. TNS3 and/or 4 has failed.
2. Wiring or terminal failure.
3. IP has failed.
1. Wiring or terminal failure.
2. GV has failed, in two stage units
3. Pressure switch failure, in mod heat units
RECOMMENDED ACTION
1. Perform OAS Resistance/Temperature check.
Replace if necessary.
2. Check ODM capacitor, replace if necessary.
3. Check wires, terminals, and CC2. Repair or replace
if necessary.
4. Check ODM, replace if necessary.
5. Replace RTRM module
6. Check for proper voltage and contact closure.
ODF20 relay has a 24 VAC holding coil. If voltage is
present, replace relay.
1. Check wiring, terminals and applicable controls
(CCB2, CCB3, HPC2, LPC2, WTL2, WTL3, TDL2 &
TDL3)
2. Verify integrity of CC2 and/or 3 coil windings. If
open or shorted replace CC2 and/or CC3.
3. If 24 VAC is present at CC2 and/or 3 coil, replace
relay.
4. 24 VAC is not present at CC2 and/or 3 coil. Reset
the Cool Failure by cycling the service disconnect.
Place the unit into Cool Stage 2 Mode, step 4 for
constant Volume or step 6 for variable air volume, to
insure CPR2 and 3 Compressor operation. Check
input devices in #1 & #2 above, if no controls have
opened, and CC2 and/or 3 will not close, replace
RTRM.
4. Check for leaks, Open wire connections, Lose
quick connect terminals, TDL2 and TDL3 resistance
check.
1. Check IDM, replace if necessary.
2. Check wiring, terminals and F contactor. Repair or
replace wiring, terminals, or fan contactor F.
3. Place unit in test mode. If the fan operates in the
test mode, test the ZSM using the appropriate test
procedures.
4. Check the RTRM fan output. Locate P2-1 on the
RTRM. Measure voltage to ground. If 24 VAC is not
present on a call for fan, replace the RTRM.
5. Check FFS and belts, repair or replace if
necessary.
1. Check CFM, replace if necessary.
2. Disconnect BROWN wires from capacitor, test, and
replace if necessary.
3. Check wiring, and terminals. Repair, or replace if
necessary.
4. Check for 230 VAC at TNS3 and/or 4 secondary,
between Y1 and Y2. If 230 VAC is not present,
replace TNS3 and/or 4.
5. Check RTOM wiring and control board software
versions.
1. Check for 115 VAC at TNS3 and/or 4 secondary,
between X1 and X2. If 115 VAC is not present,
replace TNS3 and/or 4.
2. Check wiring and terminals. Repair or replace if
necessary.
3. With 115 VAC applied to IP, warm up should take
place. Cold resistance of IP should be a minimum of
50 Ohms. Nominal current should be 2.5 to 3.0
Amps.
1. Verify presence of 24 VAC between IGN J1-7
terminal to ground, if not present, check wiring and
terminals. Repair or replace if necessary.
2. Measure voltage between TH and TR on the gas
valve (GV). If 24 VAC is present and the GV will not
open, replace the GV.
3. In mod heat units, verify the pressure switch is
wired correctly. If wired correctly, verify operation of
pressure switch.
RT-SVX34R-EN