Hewalex Geco G422-P01 User Manual

10
6. Controller's installation systems
6.1 Basic system of Hot water heating system – controlling the solar collector pump, circulation pump and the boiler
Controlling the collector pump P is done with the use of temperature sensor T1, and sensor T2, placed in the tank. When the sum of temperature T2 and the
control coefficient ∆T1 exceeds the value of temperature T1, the pump switches off, and will remain switched off until the sum of T2 + ∆T1 falls below the
value of T1. In order to prevent the system from oscillating on and off when the sum T2 + ∆T1 is equal to the temperature T2, hysteresis control has been
implemented, with the value of 2°C. When the option of controlling the rotary speed of the collector pump is switched on, the pump is switched to its
maximum speed only when the difference between the values of T1 and T2 + ∆T1 exceeds 5°C. When this difference decreases, the pump slows down
and reaches its minimum speed when the difference T1 – (T2 + ∆T1) is equal to 0. A description of the function of cooling the collectors and the work of the
controller when this function is active is presented in paragraph 4 in the description of the "Cooling" parameter.
Boiler K operates only during the hours set in the „Time programme K” option, in the „Parameters” menu. The control of boiler K is done with the use of
sensor T4. When temperature T4 is lower than temperature T4max, output O2 is switched on, controlling pump K. When temperature T4 falls below the
T4max value, output O2 is switched off and the boiler is switched off.
Additionally, controlling collector power calculated by the controller is implemented in this system. When collector power is above the power value set in the
control parameters, O2 output is switched off and remains this way until collector power is lower than the value set in the parameters. In order to prevent the
O2 output from oscillating on and off when temperature T4 is equal to the T4max value, hysteresis control has been implemented, with the value of 4°C.
Sensor T3 is not involved in control and may be disconnected. After disconnecting this sensor, horizontal lines will be displayed in place of the temperature
value, and collector power will not be calculated.
Circulation pump C can operate in two modes, continuous and non-continuous. In the continuous mode, the pump operates the whole time it is programmed
to operate in the "Time periods" menu, in the control parameters. If the circulation pump C is to operate in the non-continuous mode (10 minute intervals of
being switched on and off) during the set hours, mode of operation should be set to non-continuous work in the parameters.
Pic. 9. Schematic and electric diagram of installation no. 1
Parameter
Range
Default settings
ΔT1 [°C]
5
–
15
8
T2max [°C]
10
-
85
65
T4max [°C]
10
-
85
50
Pump regulation
Yes / No
Yes
Cooling
Yes / No
No
Circulation pump
Continuous / Non
-
continuous
Non
-
continuous
Power [W]
100
–
3000
1000
List of parameters for diagram no. 1.

Hewalex Geco G422-P01 Specifications

General

Brand	Hewalex
Model	Geco G422-P01
Category	Controller
Language	English