FLOWMETER
The flowmeter (U) serves to measure and display flow volume of the system in a range of
It has an integrated restrictor (S) with adjustment valve which allows fine adjustment of the flow volume of the solar installation.
In order to guarantee the flawless function of the measuring device the installation must be flushed and free from foreign substances.
The flowmeter MUST be mounted vertically.
Flow Restrictor
Drain valve (open)
Scale
Figure 29
Always use a flat head screwdriver to adjust the flowmeter.
Figure 30
Read the flow rate from the upper edge of the floating body.
Figure 31
START-UP AND OPERATION OF THE SOLAR PUMP STATION
Observe the following safety instructions when starting- up the solar thermal installation:
LEAK DETECTION
1.Disconnect the expansion tank from the solar system by unscrewing the nut on the tank connector. This prevents the access of dirt particles present in the pipes from entering the expansion tank.
2.Remove the temperature gauges (C, E) and the front cover (D) of the solar pump station.
3.Turn the two isolation ball valves (J, Q) to 45° using an appropriate wrench to allow flow in both directions.
4.Close the drain valve (T).
5.Close the automatic airvent at the collector array (turn the cap clockwise by hand until tight).
6.Connect an air pressure hose to the fill valve (P) below the pressure gauge (O) and open this valve.
7.Using an air compressor or pressurized air tank fill the system with pressurized air until the pressure gauge (O) reads 40 psi then close the fill valve (P).
8.The pressure should hold steady for 15 minutes. If the pressure falls it is an indication of a leak. Find and repair the leak then repeat steps 6 and 7 watching for the pressure to hold at least 15 minutes. After the pressure test slowly open the drain valve (T) to release the air pressure on the system.
FLUSHING
CAUTION
Solar thermal installations cannot be completely emptied after flushing. There is a danger of frost damage if water is used for flushing. Only use water to flush the system when the outside temperature is above 32° F, otherwise use the solar fluid to flush making sure to filter any debris before final filling.
Use a water / propylene glycol mixture as a solar fluid (maximum 50% propylene glycol).
9.Disconect the air pressure hose from the fill valve (P)
10.Connect a water hose from a water source with at least 40 PSI supply pressure to the fill valve (P).
11.Connect a discharge hose to the drain valve (T) and open this valve. Place the other end of the discharge hose into an appropriate drain.
12.Turn the supply ball valve (Q) to 90° (horizontal) so that the valve is closed.
13.Turn the slot of the flow restrictor (S) to the horizontal position using a flat head screwdriver. The integrated ball valve is now closed and will prevent debris from entering the pump.
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