Honeywell T8090T Owner's Manual - Page 20

Voltage at Clock Terminals

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Voltage at Clock Terminals AC VOLTAGE AT C-R TERMINALS 0 Vac Up to 15 Vac. 15 to 30 Vac. POSSIBLE CAUSE CHECK ACTION 1. System power is Off. 1. Restore power. 2. Short in clock power supply wiring. 2. Replace wiring. 3. Limit switch contacts stuck open. 3. Free or replace limit switch. 4. Transformer supplying power is burned out. 4. Replace transformer. 1. System transformer used to power 1. Use additional (separate) the clock is inadequate. transformer. 2. Additional (separate) transformer used to power the clock has inadequate voltage. 2. Install transformer with proper secondary voltage. 1. Spring fingers on thermostat are 1. Rebend spring fingers to a 45 not making proper contact with the degree angle to assure proper subbase terminals. contact. 2. Clock has failed. 2. Replace the thermostat. 20 69-0432-1

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20
69-0432—1
Voltage at Clock Terminals
AC VOLTAGE AT
C-R TERMINALS
POSSIBLE CAUSE
CHECK
ACTION
0 Vac
1.
System power is Off.
1.
Restore power.
2.
Short in clock power supply wiring.
2.
Replace wiring.
3.
Limit switch contacts stuck open.
3.
Free or replace limit switch.
4.
Transformer supplying power is
burned out.
4.
Replace transformer.
Up to 15 Vac.
1.
System transformer used to power
the clock is inadequate.
1.
Use additional (separate)
transformer.
2.
Additional (separate) transformer
used to power the clock has
inadequate voltage.
2.
Install transformer with proper
secondary voltage.
15 to 30 Vac.
1.
Spring fingers on thermostat are
not making proper contact with the
subbase terminals.
1.
Rebend spring fingers to a 45
degree angle to assure proper
contact.
2.
Clock has failed.
2.
Replace the thermostat.