12
6.4 A system of two heaters , allowing for additionally heating the return circulation with solar energy
Controlling the collector pump is analogous to that in the system no. 1, described in paragraph 6.1. Controlling valve U is done with the use of sensors T2 and T4, and an
auxiliary control coefficient ∆T2. When the sum of temperature from sensor T4 and the auxiliary control coefficient ∆T2 is below the value of temperature T2, valve U is
redirected to tank A. When the value of sum T4 + ∆T2 exceeds temperature T2, the valve is redirected to tank B. In order to prevent the valve from oscillating on and off of
when the sum of T4 + ∆T2 parameters is equal to temperature T2, hysteresis control has been implemented, with the value of 2°C. Sensor T3 is necessary for calculating
collector power, but it is not required in order to control the installation. The controller in this case will not display the power on the screen.
Controlling the circulation pump is analogous to that in the system no. 1 described in paragraph 6.1
Schematic and electric diagram of installation no. 4
Circulation pump
Non-continuous
Non-continuous
List of parameters for diagram no. 4
6.5 A system of priority heating of hot water and swimming pool water heating, controlling the work of the swimming pool filtration system's
pump
Heating using boiler B collectors takes place analogously to that in system no. 1 described in paragraph 6.1. The second heat receiver is swimming pool A. If
the set temperature for boiler B is achieved, or T2max temperature is exceeded, the controller automatically starts heating water in the swimming pool A,
switching off the O2 output and redirecting valve U to the swimming pool A. When temperature in swimming pool A is achieved, the controller redirects the
valve back in the direction of boiler B and switches off the collector pump. The controller switches the pump off also when temperatures T2 and T4 exceed,
respectively, maximum values of T2max and T4max. The swimming pool pump C is time controlled and operates in hours indicated in the "Time periods C"
option, in the "Control parameters" menu.. Swimming pool pump C is always switched on when the pool water is being heated. When the controller is heating
water in swimming pool A, once every hour, for a duration of 5 minutes, the controller forces a switch-off of the collector pump in order to check the conditions
in heater B and switch control back to priority tank B, if it is necessary to heat the water in it.
Similarly to the system described above, sensor T3 is not necessary to control the system, but without it, the controller will not calculate the collector's power.
In order to control heating of swimming pool water, auxiliary control coefficient ∆T2 has been introduced. When water in the tank is being heated, controlling
takes place with the use of sensors T1 and T2, and control coefficient ∆T1. In case of heating swimming pool water, control takes place with the use of
sensors T1 and T4, and the auxiliary coefficient ∆T2.
Schematic and electric diagram of installation no. 5
Cooling Yes / No No
List of parameters for diagram no. 5
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