Alfa Laval Micro Instructions D'installation, D'entretien Et D'utilisation page 10

Alfa Laval Micro
Installation, service and operating instruction
2 Operating instructions
2.1 General operation
The temperature and pressure of the incoming heating network water are very high. The heat from the heating
network water is transferred to the heating and hot water systems of the building in the heat exchangers. The
heat is transferred through thin plates of acid-resistant stainless steel which keep the heating network water
completely separate from the systems in the building.
Micro has automatic temperature control for hot water. This measures the temperature of the hot water in the
heat exchanger and automatically controls the primary flow.
The hot water temperature is controlled by a temperature control system which is set to about 50 ºC.
If the temperature is set too high, there is a risk of scalding. Setting the hot water temperature too low may
result in unwanted bacteriological growth in the hot water system.
After adjustment, the Micro operates completely automatically. However, in hard water areas it is advisable to
be attentive and to remedy any faults in good time if the temperature of the hot water is too high; otherwise the
risk of lime deposits in the heat exchanger may increase.
The energy supplier registers the use of energy. Measurement is done by recording the flow of heating network
medium through the system, and by measuring the temperature difference between the medium's supply and
return flow.
2.2 Heating operation Alfa Laval Micro STC and Alfa Laval Micro STC2
With an Alfa Laval Micro STC or an Alfa Laval Micro STC 2, the heating circuit is controlled in relation to
outdoor temperature (option) and/or desired room temperature by means of a room thermostat and
temperature sensor. When no heat is needed, the circulation pump in the heating circuit stops automatically,
but is started regularly to make sure that it does not seize up during long idle periods.
Micro STC2 has an extra heating connection that can be connected to radiators or towel heating.
2.3 Heating operation Alfa Laval Micro RTC
With an Alfa Laval Micro RTC, the heating circuit is controlled with a desired room temperature by means of a
room thermostat. When the measured room temperature is to low according to desired room temperature, the
relay box sends a signal to open the relay.
2.4 Safety equipment/inspection

Daily inspection to check for leaks from pipes or components.

Weekly inspection to make sure that the operation of the heating and hot water control systems is
stable and that the temperature does not fluctuate. Temperature hunting causes unnecessary wear
of valves, thermostats and heat exchangers.

Every three months check the safety valves and the pressure in the heating system.
To check the operation of a safety valve, turn its wheel/knob until water escapes from the waste pipe of the
valve, then close the wheel/knob quickly. Occasionally a safety valve may open automatically to release excess
pressure. After a safety valve has been open it is important that it closes properly and does not drip.
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