ST-77 – Manual Guide
III.a) Temperature Alarm
This protection activates only in the cycle of
work
(i.e. when the
temperature of the boiler is lower than the Set Temperature). If the
temperature does not increase in the time set by the user (see sub-
chapter: Alarm) , alarm is activated: the feeder and the fan are
automatically turned off, (water pump is turned on/off independenty),
and the sound signalling is turned on. The screen projects an adequate
message:
The regulator expects the button
MENU
to be pressed, after which
the alarm is turned off. The regulator returns to the previously set
process of work.
III.b) Thermal Protections
It is an additional bimetallic mini-sensor (installed next to the
boiler’s sensor) which cuts off the feeder and fan’s exits in the case of
reaching and exceeding the temperature of 90 degrees. It prevents water
which is in the system from boiling in case of the failure in the work of
the regulator.
III.c) Automatic Sensor Control
Alarm is activated in the case of failure in the work of the sensors of
CH or CHW temperature or in the work of worm. Adequate message
about the failure is also projected on the screen, e.g.:
The feeder nad the fan are turned off. The pump is turned on
independently of the actual temperature. The regulator i waiting for the
button
MENU
to be pressed after which alarm is turned off and the
regulator starts working again.
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A L A R M
NOINCREASE INTEMP
A L A R M
SENSOR FAILURE
Summary of Contents for ST-77
Page 1: ...ST 77 Manual Guide...
Page 20: ...Notes...