Honeywell T8195B Owner's Manual - Page 20

Voltage at Timer Terminals - thermostat wiring

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Voltage at Timer Terminals Ac Voltage at C-R Terminals Possible Cause Check 0 Vac 1. System power is Off. 2. Short in timer power supply wiring. 3. Limit switch contacts stuck open. 4. Transformer supplying power is burned out. Up to 15 Vac. 1. System transformer used to power the timer is inadequate. 2. Additional (separate) transformer used to power the timer has inadequate voltage. 15 to 30 Vac. 1. Spring fingers on thermostat not making proper contact with subbase terminals. 2. Timer has failed. Action 1. Restore power. 2. Replace wiring. 3. Free or replace limit switch. 4. Replace transformer. 1. Use additional (separate) transformer. 2. Install transformer with proper secondary voltage. 1. Rebend spring fingers to a 45 degree angle to ensure proper contact. 2. Replace thermostat. 20 69-0563-2

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20
69-0563—2
Voltage at Timer Terminals
Ac Voltage at
C-R Terminals
Possible Cause Check
Action
0 Vac
1.
System power is Off.
1.
Restore power.
2.
Short in timer 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 timer is inadequate.
1.
Use additional (separate)
transformer.
2.
Additional (separate) transformer
used to power the timer has
inadequate voltage.
2.
Install transformer with proper
secondary voltage.
15 to 30 Vac.
1.
Spring fingers on thermostat not
making proper contact with
subbase terminals.
1.
Rebend spring fingers to a
45 degree angle to ensure
proper contact.
2.
Timer has failed.
2.
Replace thermostat.