1. Use and construction of the pump and control unit Pump and control unit is used to cooperate with solar collectors in an installation with a required heat transfer fluid. Maximum flow rates of up to 18 l/min can be set, depending on the area of the mounted solar collectors. The pump and control unit is compacted in a foamed polypropylene cover and it contains accessories necessary for correct functioning of the solar installation. Construction of the pump and control unit is presented in Figure 1 below. Spacing of 010 openings for attaching the unit 81mm 23 mm Fig. 2. Diagram of spacing between 010 openings necessary for attaching the pump control unit

2. Diagram of solar installation connections Fig. 3. Schematic diagram of solar installation 3. Assembly of the pump and control unit. Consecutive steps. a. Attach the pump and control unit to the wall using 3 anchor screws in spacing as presented in Figure 2. b. Connect the hydraulic connections of the pump and control unit with the solar collectors, the boiler, and the expansion tank, as shown in the schematic diagram of the installation (Fig. 3). c. Cold water connection should be done according to the presented schematic diagram of the installation (Fig. 3), or the schematic diagram of the...

h. In case of a reduction or interruption of the flow (message “flow insufficient” - confirm with the OK button) turn counter clockwise the circulation pump main screw (11) and let out the air blocking the pump. Continue till full deaeration of the system. If, after 5 minutes, the flow is still insufficient, the controller will issue a “Pump blocked...” message - in order to switch the pump on again, press OK button. i. In case the pressure measured by the pressure gage (12) is below 1.5 bar, fill in the system to reach required system overpressure of p = 2.5 bar. j. Disconnect supply and overflow...

ATTENTION!!! Dashed lines refer to optional sensors than can be installed but are not required for correct operation of the controller (Fig. 1). Description of G422 controller Controller is equipped with an LCD screen and 7 buttons. After connecting electric connections correctly, turn on the controller by pressing . In normal operation, the controller's screen displays: • Current installation scheme number and diagram, • Current date and time, • Current temperatures in respective measurement locations (a lack of the sensor is indicated by displaying - - -, and damage of the sensor by displaying...