Alarms and Troubleshooting
OAU-SVX005C-EN 53
RTRM Failure Modes
Following is the listing of RTRM failure indication causes.
System Failure
Check the voltage between RTRM terminals 6 and 9 on J6,
it should read approximately 32 Vdc. If no voltage is
present, a System failure has occurred. Refer to Step 4 in
“Microprocessor Control,” p. 51 for the recommended
troubleshooting procedure.
Cooling Failure
• CLP1 has opened during the 3 minute minimum “on
time” during four consecutive compressor starts,
check CLP1 by testing voltage between the J1-8 and
J3-2 terminals on the RTRM and ground. If 24 Vac is
present, the CLP has not tripped. If no voltage is
present, CLP has tripped.
System Failure
Measure the voltage between terminals J6-9 and J6-6.
Normal Operation = approximately 32 Vdc
System Failure = less than 1 Vdc, approximately 0.75 Vdc
Cool Failure
Measure the voltage between terminals J6-8 and J6-6.
Cool Operating = approximately 32 Vdc
Cool Off = less than 1 Vdc, approximately 0.75 Vdc
Cooling Failure = voltage alternates between 32 Vdc and
0.75 Vdc
Airflow Troubleshooting
Unit Trips Heater
High Limit
High fire gas manifold pressure too high
Supply fan speed too low
Dirty or clogged filters
Restricted discharge air duct
Temperature of air entering heater too high
Defective high limit
Protonode Not
Communicating
Change Baud rate on UC600 to 38,400
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when
exposed to live electrical components could result in
death or serious injury. When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been properly
trained in handling live electrical components perform
these tasks.
AVERTISSEMENT
Composants électriques sous tension!
Le non-respect de toutes les consignes de sécurité lors
de la manipulation de composants électriques sous
tension peut entraîner des blessures graves, voire
mortelles. S’il est nécessaire de travailler avec des
composants électriques sous tension, demandez à un
électricien qualifié et agréé ou à une autre personne
ayant la formation nécessaire pour manipuler des
composants électriques sous tension d’exécuter ces
tâches.
Table 17. TOAU UC600 troubleshooting (continued)
Trouble Possible Cause
Table 18. Airflow troubleshooting
Airflow
Profile Opening Width (in.)
6-in. Burner 12-in. Burner 18-in. Burner
500 6.5
750 7.5
1000 9
1250 10
1500 11-1/4
1750 12-1/2
2000 13-3/4
2250 14-3/4
2500 16 14
2750 17-1/4 15
3000 18-1/2 15-3/4 14-1/4
3250 19-3/4 16-3/4 15
3500 21 17-1/2 15-1/2
3750 22 18-1/4 16-1/4
4000 23-1/4 19-1/4 17
4250 24-1/2 20 17-1/2
4500 25-3/4 21 18-1/4
4750 27 21-3/4 18-3/4
5000 22-1/2 19-1/2
5250 23-1/2 20-1/4
5500 24-1/4 20-3/4
5750 25 21-1/2
6000 26 22
6250 26-3/4 22-3/4
6500 27-3/4 23-1/2
6750 28-1/2 24
7000 29-1/4 24-3/4
7250 30-1/4 25-1/4
7500 31 26
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