Shut-off and check valves
The shut-off valves are
equipped with a built-in check
valve, positioned inside the ball.
1. To allow the passage of the
medium in both directions, the
ball valves must be opened to
45° using a 9 mm hex wrench
(supplied with unit).
The check valve is opened by
the ball, see figure (A).
2. In normal system operation,
the ball valves must be fully
open.
A
Complete closing and opening of the valve
The valve can be fully
closed or fully open.
A slot on the valve
adjusting stem indicates
the status of the valve.
Correction for different density liquids
Changes in flow rate readings remain within the indicated
accuracy (±10%) for glycol percentages of up to 50%.
Fully closed
Fully open
6
7
Captive nut
Flow rate adjustment
1/2” F fitting
Graduation
3/4” F fitting
Flow meter
The flow meter is a flow rate measuring device, float equipped, with
an adjustment ball valve.
The meter has a range of 2 to 8 gpm.
The flow meter must always be installed in a vertical position.
A thermometric label on the back of the flow meter signals if the
maximum permitted temperature (230°F/110°C) has been exceeded:
white = temperature not exceeded;
dark = maximum temperature exceeded.
Warranty will be void if this label is removed.
The reading is taken from
the top edge of the float
Important!
Use only a 9mm
hex wrench (supplied with unit)
to adjust the flow meter.
8
7
6
5
◀
◀
open
closed
230 F
110
C
Thermometric
label
A
B
Correct
position
Incorrect
position
Air separator
The solar pump stations with supply and return connections (279
series) are equipped with an air separator on the flow line. The gases
separated from the heat transfer medium collect at the top of the air
separator. The collected gases must be evacuated from time to time
(every day after putting into operation and afterwards, depending on
the quantity of air, once a week or once a month) by opening the
manual air vent with a suit-
ably sized screwdriver.
To maintain optimal
efficiency of the solar
thermal system, after-
wards, it is necessary
to discharge air from the
system every six months
using the air separator.
