Alpha Solar SolaStat-Eco Panduan Instalasi - Halaman 15

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SolaStat-Eco Plumbing Issues.

Disclaimer.

For full information on compliance and safety standards for solar hot water systems the appropriate
local standards must be referred to. All plumbing to be carried out by qualified plumbers only.
We provide the following information as a guideline only to help obtain the greatest efficiency from
the system. Any information supplied here is based on feedback to us by experienced solar hot
water professionals and in no way represents a complete guide to plumbing such a system, as we
are not plumbers and do not represent ourselves as such. Best plumbing practices must be used
in all instances.

Introduction.

Any solar hot water system involves professional level plumbing and water much hotter than
would normally be seen in standard domestic hot water systems. For this reason
Ltd
SolaStat
recommends any installation is carried out by a registered and qualified plumber. All parts including
the pump must be rated for the elevated temperatures found in solar hot water systems.

Solar Hot Water Specifics.

1. Tempering valve.

There is a huge amount of energy radiated by the sun. It is not uncommon for the water from the
solar collector to exceed 100 C (under pressure).
Therefore it is vital a tempering or 'mixing' valve is fitted so the domestic supply from the tank does
not burn the end users. The tempering valve must be installed to best plumbing practices. The
tempering valve must be rated to handle these elevated temperatures.

2. Non return valve.

Hot water rises and cold water falls. If the solar collector is colder than the tank, such as during the
night, the hot water from the tank can self thermosiphon up to the collector. The collector now
radiates the heat to the cool night air and the water descends back down to the tank. To stop this
loss of hot water at night or during cloudy skies there has to be a one way or 'non return' valve
fitted.
The failure of this non return valve is a common problem with solar hot water systems. The orien-
tation of the valve as per manufacturer's instructions is critical. Also the valve sometimes will not
close when swarf or other debris gets caught in the valve seat.

3. Pressure relief valves.

Solar hot water systems can run much hotter than standard domestic hot water systems. Hotter
water expands more and needs high quality pressure relief valves to avoid possible catastrophic
rupturing somewhere in the system, probably the tank.
Qualified plumbers using best industry practice must decide on adequate pressure relief valves,
the number and placement of them.

4. Air Relief Valves.

It is important that air relief valves are fitted (especially in a low pressure system) to the highest
point of both the feed to and the return from the solar water collectors. Otherwise air locks can
occur within the piping etc., and not just the pump. (An air lock in the system will increase the head
that the pump is working against and for some installations this is too much and the water ceases
to circulate. For systems where air locks occur, the pump may need to be set to a higher speed or
a higher head pump installed).
19.03-15