RM Solar S Class 20 Manuál s instrukcemi stáhnout pdf (Strana 55)

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9. Expansion vessel

(also known as expansion tank or pressure vessel)

9.1 Function of the Expansion Vessel

An expansion vessel protects the solar system during pressure changes and

temperatures uctuations.

For example, in very hot conditions when energy is not being drawn off, the system

may overheat causing the glycol to expand.

9.2 Technical information:

Maximum pressure: 10 bar

Working pressure: 3.0 – 4.0 bar (20°C)

Gas pressure: 2.5 bar

Maximum working temperature: 130°C

Membrane: Nytril (butyl) rubber

Resistance: 40 % glycol

9.3 Expansion vessel sizing:

It is of critical importance to have the correct size of expansion vessel in your solar

system. The volume of the expansion vessel is determined by the number of RM

Solar solar panels connected within the one

solar heating system. For one collector 6 Litres of the expansion vessel volume is

required. Please use the right size expansion vessel, and we set out a table below to

help you chose the correct size:

Number Of Collectors Expansion Vessel Size

2 18

3 18

3+ Please call for details

9.4 Location:

The pressure vessel should be located in a position where it can be easily accessed.

It should be tted with isolating valve for ease of replacement. The isolating valve

should not be accessible without a tool so that an unqualied person cannot shut it

off. The expansion vessel should be tted on the return run of the system.

9.5 Maintenance:

Once an expansion vessel is pressurised correctly it does not require maintenance

although we strongly recommend a visual inspection by a qualied person at least

once a year. Monthly checking of the pressure gauge on the double pump station is

also very important. A pressure drop might indicate:

A leak on the pipes connections or•

A leak on the panels connections or•

A faulty expansion vessel•

In the case of any unexpected changes, the customer must contact the installer

immediately and the installer should inform the customer of this when explaining the

system.

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RM Solar S Class 20 Manuál s instrukcemi Strana 55