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FLOWMETER
The flowmeter (U) serves to measure and display flow
volume of the system in a range of 0.5-3.5 US gpm.
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
Disconnect the expansion tank from the solar system 1.
by unscrewing the nut on the tank connector. This
prevents the access of dirt particles present in the
pipes from entering the expansion tank.
Remove the temperature gauges (C, E) and the front 2.
cover (D) of the solar pump station.
Turn the two isolation ball valves (J, Q) to 45° 3.
using an appropriate wrench to allow flow in both
directions.
Close the drain valve (T).4.
Close the automatic airvent at the collector array 5.
(turn the cap clockwise by hand until tight).
Connect an air pressure hose to the fill valve (P) 6.
below the pressure gauge (O) and open this valve.
Using an air compressor or pressurized air tank fill 7.
the system with pressurized air until the pressure
gauge (O) reads 40 psi then close the fill valve (P).
The pressure should hold steady for 15 minutes. 8.
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).
Disconect the air pressure hose from the fill valve (P)9.
Connect a water hose from a water source with at 10.
least 40 PSI supply pressure to the fill valve (P).
Connect a discharge hose to the drain valve (T) and 11.
open this valve. Place the other end of the discharge
hose into an appropriate drain.
Turn the supply ball valve (Q) to 90° (horizontal) so 12.
that the valve is closed.
Turn the slot of the flow restrictor (S) to the horizontal 13.
position using a flat head screwdriver. The integrated
ball valve is now closed and will prevent debris from
entering the pump.