Circulation Connection - Panasonic PAW-TA20C1E5C Technisches Handbuch

The water connection must only take place via a certified membrane safety valve or a membrane safety valve combination
connection fitting (no piston valve) for pressure-resistant storage tanks! A safety valve combination consists of shut-off, test,
back-flow, drainage and safety valves with an expandable water outlet and is installed between the storage tank's cold water
inlet pipe and cold water inlet in the marked sequence:
Storage tank connection according to DIN 1988 and ÖNORM B2531:
The following must be observed:
In order to ensure the faultless functioning of the connection fittings these may only be installed in frost-protected spaces.
The outlet of the safety valve must be open and observable and/or the outlet pipe from the drip tray (water overflow funnel)
must be introduced into the sewer line so that neither frost nor blockages due to dirt and the like can result in a malfunction.
It is to be ensured that the drip container or the drainage object is free of deposits and dirt.
No shut-off valve or any other restriction may be installed between the safety valve and the storage tank cold water inlet.
The outlets of the safety valves (domestic water as well as heating circuits) must lead to a corresponding drainage object in
order to prevent any damage from the leakage of operating liquid.
The safety valve must be configured for a trigger pressure that is lower than the nominal pressure of the storage tank. Before
the final connection of the storage tank the cold water inflow pipe must be flushed through.
Once the water has been connected and the storage tank has been filled without air bubbles, the function of the connection
fittings must be checked.
When lifting or turning (ventilation) the safety valve testing knob, the water must be able to flow properly and without
congestion from the excess water funnel.
To check the back-flow valve the shut-off valve is closed and no water should escape via the open test valve. Testing the safety
valve must take place according to DIN 1988 or ÖNORM B2531.
The operation of the storage tank takes place via the hot water valve of the control device (mixing unit). Therefore, the storage
tank is permanently under pressure. In order to protect the inner boiler from overpressure during heating, the excess water
that arises during each heating is drained off via the safety valve. In the event of a drop in pipeline pressure, the back-flow
valve prevents the back-flow of the hot water into the cold water pipe system thereby protecting the boiler from being
heated up in the absence of water.
The storage tank can be separated from the cold water supply grid through the shut-off valve on the water side and, therefore,
also from pressure and can be drained off via the drainage valve if necessary.
In order to allow repairs to be carried out easily and to allow the device to be removed or replaced, it is necessary to establish
the connection to the tank by means of a detachable connection (union).
Storage tank leaks as a result of an improper connection and resulting damage and consequential damage are excluded from
the warranty and product liability.

3. CIRCULATION CONNECTION

A circulation connection is to be avoided if possible due to significant energy losses. If a widely ramified domestic water
network requires a circulation line, this is to be well-insulated and the circulation pump is to be controlled via a timer switch
and thermostat. The switching temperature of the thermostat should be set low (45°C). The circulation connection piece is
provided with an outer thread.
Id.Nr. 248611-3
Storage tank
27
PAW-TA20C1E5C