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| EN
EIOM v2018.04
Figure 6.1.3 – Water valve actuator (SAX…) manual override
When pushing the manual adjuster down (1), it engages and the actuator can be manually operated. When turning the manual adjuster in a clock-
wise/counterclockwise direction (2), the actuator’s stem extends/retracts.
NOTE: For more information, control, maintenance, diagnostics and troubleshooting refer to water circulation pump and water valve actuator
technical specification.
Water heater protection from freezing
During cold weather conditions water heater can freeze. Protection from potential freezing of heat carrier must be installed. Anti-freeze tempera-
ture sensor and thermostat are used for this purpose.
Anti-freeze temperature sensor
is installed on the return pipe of the water. For mounting temperature sensor on the pipe - clip (hose clamp) is
used.
Figure 6.1.4 – Installation of the anti-freeze temperature sensor
Capillary thermostat
are electric circuit control devices which open or close an electric contact depending on temperature changes at the bulb.
Capillary thermostat must be installed behind the water heater.
Capillary thermostat needs to be mounted inside air unit. If it is not possible, thermostat must be mounted inside box from dust protection and
outside air temperature.
Capillary thermostat set point +5°C.
Figure 6.1.5 - Capillary thermostat electrical connection. On temperature rise above setting 1-2 opens and 1-4 closes; On temperature drop
below setting 1-2 closes and 1-4 opens.
NOTE: When water heater is integrated in the unit, supply air damper actuator must be with the spring return. In case of the power supply failure,
damper will close and water heater will be protected from freezing.
NOTE: For more information, control, maintenance, diagnostics and troubleshooting refer to capillary thermostat technical specifica
-
tion.
General:
If the valve actuator does not operate:
• Check connectors and contacts;
• Check if the actuator is connected properly and operating voltage is supplyed;
Potential fault of the anti-freeze temperature sensor and thermostat:
• Check anti-freeze thermostat. In normal mode, environment temperature of the capillary must be higher than set on the thermostat. Contact
between terminals 4 and 1 must be closed.
• If supply air temperature is low, the assemblies of the heating system must be inspected.
After starting the device, inspect if:
• The circulation pump rotates smoothly;
• The valve actuator is controlled smoothly;
• Control panel does not indicate faults of the anti-freeze protection (when the device has built-in control system);
• Water temperature sensor provides correct values;
• The thermostat is set at +5°C mark.
