ST-85 – USER'S MANUAL
III.e) Monitoring the flue gas outlet temperature
This sensor constantly monitors the flue gas outlet temperature. If the
sensor is damaged, disconnected from the controller or removed from the
flue conduit, Flue Gas Sensor Damaged massage will appear on the
display. This will cause the controller to switch to the emergency mode. In
such case, only boiler temperature is used. The controller is operated using
only the boiler sensor and the zPID function remains active without the flue
gas outlet sensor.
III.f) Fuse
The regulator has a network protection WT 3.15 A tube fuse. Higher
current ratings may cause damage to the controller.
IV. Maintenance
Before and during the heating season, the ST-85 controller should be
checked for condition of its cables. You should also check if the controller is
properly mounted and clean it if dusty or dirty. It is advisable to measure
grounding parameters for the motors (central heating pump, hot
consumption water pump and fan)
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O
c 98
O
c 50%
C.H. Flue Fan D
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