State Standard Systems - Manual (Page 24)

24
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 30. Figure 31.
Always use a flat head screwdriver to adjust the flowmeter.
Read the flow rate from the upper edge of the floating body.
Figure 32.
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. Be sure the air vent at the collector array is closed.
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. THERE IS A DANGER OF FROST DAMAGE IF
WATER IS USED FOR FLUSHING. ONLY USE WATER TO FLUS 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. Disconnect 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.
14. Turn on the supply water and open the fill valve (P)
then leave running for 15 minutes to flush debris out
of the solar loop
15. After the 15 minute flush turn off the supply water at the
source and allow the system to drain. When water stops
flowing out of the discharge hose close the fill valve (P)
16. Close the drain valve (T) on the pump station and
move this hose to the drain valve that was installed at
the lowest point of the solar loop (near the bottom of
the tank)
17. Open this drain valve with a flat head screw driver
and open the fill valve (P) slowly to vent the system
and allow the remaining water to drain out. In order
to vent the system completely it is necessary to open
the flow restrictor (S) - turn with flat head screwdriver
until vertical.
preparation of the heat transfer fluid
18. Pour 100% Propylene Glycol into a large clean bucket.
Add an equivalent amount of distilled or de-mineralized
water for a 50/50 solution by volume.
The use of regular tap water as a mixing agent is
prohibited. Distilled or de-mineralized water is often
available from grocery stores and drugstores. This