20
SOLATHERM
reserves the right to modify characteristics of the products or their accessories and components without prior notice.
For the filling and draining of the system, please follow carefully the following steps:
Attention: Always fill the tank with water before filling the closed circuit with the thermal fluid
mixture. Similarly, when draining the system, always drain the closed circuit before emptying the tank
of water.
1.
Filling the tank:
Fill the tank with water by opening a hot water tap somewhere in the house and the
BALL VALVE
(No.10)
on
the cold-water inlet of the tank.
Once the tank is full, close the tap inside the house and proceed to the filling of the closed circuit with
the thermal fluid/water mixture. Closed circuit is filled
Note:
If water hardness is above 250ppm or if the water is not very clean, it is recommended to install a
water filter. Above 400ppm, a water softener is advised.
2.
Filling the closed circuit:
Use a bucket in order to mix the thermal fluid with purified water before filling the solar system. Always
put the thermal fluid in the bucket before the water and mix thoroughly.
Place the bucket with the mixture above the tank and fill the system through the outlet where the safety
valve (No.9) or expansion vessel (No.14) will be fitted, on the top right side of the tank.
The system will be full when the mixture starts coming out the outlet on the other side of the tank where
fitting No.8 is placed. At this point plug and tighten fitting No.8. Shake the system so that any eventual
air bubbles that are trapped can exit through the filling valve and complete with more thermal fluid
mixture until fluid is spilled. Install the safety valve (2 bar) and plug on the outlets.
Closed circuit filling
inlet
Loop is filled when water
flows from the outlet
Procedure
1.
Mix thermal fluid with water in a bucket and start the
filling process. The use of a funnel is recommended
for ease of filling.
2.
When all thermal fluid is inserted, continue filling
with water. It may take some time, do not rush or air
can be trapped in the system and the process will
take much longer.
3.
When the closed circuit is filled, plug the fill-in fitting
with the ¾” male plug (image on the left) and
install
the safety valve or expansion vessel with safety valve
if included (image on the right)
Safety Valve or
Expansion Vessel
connection