5
4.3 Tap water heating system - controlling solar collector pump, circulation pump and a boiler - scheme no 3
Controlling the P collector pump
Similarly as in scheme no 1 - description in point 4.1.
Controlling the C circulation pump
Similarly as in scheme no 2 - description in point 4.2.
K boiler control for tap water heating
The K boiler is only switched on for water heating in the time programmed in the “Time program K” option to be found in the “Parameter settings” menu. The boiler will switch off if
the temperature of the upper part of the T4 heater is lower than the set “Max. temp. T4 OFF heat source”. If the temperature of water in the T4 heater reaches to set value of “Max.
temp. T4 OFF heat source”, the boiler will be switched off. Additionally, the controller makes it possible to make boiler operation independent of the solar collectors. Boiler may be
switched off if the calculated collector power is higher than the “Coll. power OFF boiler, heater, heat pump” value set in control parameters.
ATTENTION ! Connecting the T3 sensor is necessary for calculating collector instantaneous power.
Tap water boiler can be controlled in two ways.
1. Switching the boiler on with a fault of appropriate contacts inside the boiler.
2. Switching the boiler on with temperature sensor input in the boiler by simulation of appropriately selected resistors corresponding to boiler switch on and switch off
temperatures. An example of a table of resistances depending on the manufacturer of a given boiler has been presented in the table below.
ATTENTION ! The original tap water temperature sensor remains disconnected and replaced by 2-wire cable from the controller GH26.
Table 2. Resistor resistance for selected boiler manufacturers
Fig. 5. Schematic and electrical diagram of installation no 3.
4.4 Tap water heating system - controlling solar collector pump, circulation pump and an electrical heater – scheme no 4
Controlling the P collector pump
Similarly as in scheme no 1 - description in point 4.1.
Controlling the C circulation pump
Similarly as in scheme no 2 - description in point 4.2.
Controlling electrical heater for tap water heating
Similarly as for the boiler in scheme no 3 - description in point 4.3.
The heater is switched on indirectly by passing voltage to transmitter coil which leads to a fault of appropriate connectors inside such a transmitter.
Sample
boiler manufacturer
R1 resistor [kΩ]
Temp. 20 30°C
R2 resistor [kΩ]
Temp. 70 80C
Sample
boiler manufacturer
R1 resistor [kΩ]
Temp. 20 30°C
R2 resistor [kΩ]
Temp. 70 80C
Acv
12,0 15,0 1,5 2,0
Brotje Heizung
8,0 12,5 1,2 1,7
Ariston
8,0 12,0 1,5 2,0
Buderus
8,0 12,5 1,2 1,7
Beretta
9,0
14,0 1,8
2,0
De-Dietrich
10,0
15,0 1,8
2,3
Ferolli
8,0
12,5 1,2
1,7
Vaillant
3,5
3,3 0,4
0,6
Junkers
10,0 14,8 1,9 2,4
Viessmann (new boilers)
9,0 15,0 1,5 1,8
Stiebel Eltron
10,0 15,0 1,0 1,5
Viessmann (old boilers)
0,54 0,56 0,64 0,66
Termet
10,0 11,0 1,4 1,8
Wolf
5,0 7,0 1,8 2,6
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