Caleffi 269 - Manual (Page 7)

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 fluid
in both directions, the ball valves
must be opened at 45°, using a
9 mm fixed wrench.
The check valve is opened by the
ball, see figure (A).
2. In normal system operation, the
ball valves must be completely
open.
Air separator device
The solar circulation units with flow and return connection are
equipped with an air separator device on the flow line. The gases
separated from the thermal carrier medium collect at the top of the
deaerator.
The collected gases must be evacuated from time to time (every
day after commissioning and afterwards, depending on the
quantity of air, once a week or once a month) using the manual air
vent with a suitably sized screwdriver.
To maintain optimal efficiency of the solar thermal system,
afterwards, it is necessary to
vent the system every six
months by using the deaerator.
A
Full closing and opening of the valve
The valve can be
completely opened or
closed.
A slot on the obturator
stem indicates the
status of the valve.
Correction for liquids with different density
The variation in the flow rate reading remains within the range of
accuracy indicated (±10%), for glycol percentages up to 50%.
Fully closed Fully open
7
Captive nut
Flow rate adjustment
Fitting 1/2” F
Graduation
Fitting 3/4” F
Flow meter
The flow meter is a floating gauge flow rate measurator with a
built-in regulating ball valve.
It works within the range of 1–13 l/min.
The flow meter must be fitted in a vertical position only.
A thermometric label is placed on the back of the flow meter to
signal if the maximum permitted temperature (110°C) has been
exceeded:
white color = temperature not exceeded;
dark color = maximum temperature exceeded.
The label removal makes the manifacturer warranty on the device
expire.
The level is taken from the
top edge of the float.
N.B! Use only a 9mm fixed
wrench to regulate the flow
meter.
13
11
9
7
➜
➜
open closed
23
0 °F
110
°C
Thermometric
label
A B