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Voltage at Clock Terminals
AC Voltage at
C-C Terminals Check Action
0 Vac. — System power off. — Restore power.
— Short in clock power supply wiring. — Replace wiring.
— Limit switch contacts stuck open. — Free or replace limit switch.
—Transformer supplying power is — Replace transformer.
burned out.
Up to 15 Vac. — System transformer used to power — Use additional (separate)
the clock is inadequate. transformer.
— Additional (separate) transformer — Install transformer with proper
used to power the clock has secondary voltage.
inadequate voltage.
15 to 30 Vac. — Spring fingers on thermostat not — Rebend spring fingers to a
making proper contact with subbase 45 degree angle to assure
terminals. proper contact.
— Clock has failed. — Replace thermostat.
Servicing the Thermostat
Cycle Rate Adjustment
(T8095A only)
The equipment should cycle on and off just
enough to keep the room temperature close to
the temperature lever settings.
If the thermostat seems to cycle the heating
system too fast or too slow, adjust the cycle rate
by moving the anticipator setting lever one
indicator mark at a time (Fig. 6). Observe the
heating system operation after each adjustment.
NOTE: Most hot water systems require a setting
of 1.2A.
Fig. 6—Heat Anticipator Setting.
M7317
ANTICIPATOR
SCALEPLATE
ANTICIPATOR
SETTING LEVER
22
23 69-0639—1