Iv.d) Anti-Boil Protection; Iv.e) Monitoring The Flue Gas Outlet Temperature; Iv.f) Fuse; Maintenance - Tech Controllers EU-81zPID User Manual

The current temperature is read from an electronic sensor and processed by the thermoregulator. When
the alarm temperature is exceeded, the fan is shut off and both pumps begin to run in order to distribute
hot consumption water throughout the system.
Anti-Boil Protection
IV.d)
This protective function is used only with the water heater priority mode. For example, when the water
heater setpoint temperature is 55
priority temperature), the controller shuts off the fan.If the boiler temperature reaches 80
pump will be activated. If the temperature continues to rise, the alarm will be activated at 85
condition may appear when the water heater or the pump is damaged or when the sensor has been
improperly installed. However, if the temperature drops, the controller will activate the fan at 66
it will remain in the duty mode maintaining the priority temperature of 62
Monitoring the flue gas outlet temperature
IV.e)
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.
Fuse
IV.f)
The regulator has a network protection WT 3.15 A tube fuse. Higher current ratings may cause damage
to the controller.
V. Maintenance
Before and during the heating season, the ST-81 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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EU-81zPID
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