Wolf TopSon F3-1, Installation, Operating And Maintenance Instructions

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Initial start-up

During commissioning the solar circuit is flushed, filled and pressurised. At this 

stage the collector must not transfer any heat - it should be covered, unless 

solar radiation levels are very low. Commissioning is generally carried out 

using only ANRO.

Filling and flushing

If a filler pump is used for filling the system, ensure that air can escape at the 

highest point/s. Metal manual air-vent valves are ideal for this purpose. In this 

case, however, a second person will be required to close the air-vent valves 

as soon as fluid begins to exit.

The solar filler and flushing pump from the Wolf accessories range has proven 

reliable in practice. With the pump it is no longer necessary to bleed the system 

at its highest point. The decisive factor is that the flow velocity in horizontal 

and falling sections of the solar circuit is greater than 0.4 m/s, this will ensure 

that the air bubbles are pulled along.

To prevent extensive foaming of the ANRO, we recommend that you start filling 

the pipework slowly with a reduced flow rate and then gradually increase the 

rate. Care should also be taken that when fluid flows back into the fill vessel, 

any turbulence is kept as low as possible. The fluid level above the return or 

flow connector should always be high enough so that the fluid surface in the 

vessel is calm.

Take care with objects with high static head. A negative pressure may form at 

high points owing to the falling water column beyond. This causes the boiling 

point of the fluid to decrease strongly and even at a low temperature steam 

may form, preventing the system from being filled correctly. Reducing the 

drain rate at the BDF valve can help prevent this situation. Reduce the drain 

flow rate until the required system operating pressure is constantly maintained 

at the pressure gauge.

Filling the system / Safety datasheet / 

Initial start-up

Filling the system

For flushing and filling the solar heating system, we recommend the use of a 

fill & flush pump that runs for at least 30 to 60 minutes. This makes manual 

venting superfluous. Also consult the manufacturer's instructions for the solar 

pump assembly.

Extract from the safety datasheet:

Trade name:

Company:

Emergency information:

ANRO heat transfer medium (ready-mixed, frost protection to -30 °C) 

Wolf GmbH, Postfach 1380, D-84048 Mainburg; Tel: +49 (0)8751/74-0; 

Fax: +49 (0)8751/49 (0)40 -209497-0 (weekdays 08:00 - 17:00 h)

Chemical properties:

1,2-Propylene glycol with corrosion inhibitors,  

45.3 % by vol. mixed with 54.7 % by vol. potable water, dyed blue.

Particular safety information for 

personnel and the environment:

Not required

After contact with eyes: 

After contact with skin: 

After ingestion:

Flush with clear running water for 15 minutes whilst holding the 

eyelids apart. 

Wash with water and soap. 

Flush mouth and drink plenty of water.

Transport:

Not dangerous cargo in the sense of the transport regulations.

Water risk category:

WGK1; little risk to water.

The full safety data sheet is available from the "Download Centre" of the Wolf homepage.

Do not fill the system or uncover the collectors in strong sunshine. There 

is a risk of burns. Only use undiluted ANRO to fill the system. Never add 

water or any other heat transfer medium. There is a risk of flocculation, 

and frost and corrosion protection can no longer be guaranteed. This 

may lead to a complete failure of the system.

Filling and flushing 

the system