Temperature And Pressure Valve; Non-Return Valve; Tank Affusion; Water Pressure And Drainage - Danfoss DTW 300 SP Installation, Service And User Manual

6.2

Temperature and pressure valve

The specification of the valve connecting (internal) thread is DN20 (RC3/4"). After installation, it must be confirmed
that the drainpipe outlet is exposed in the air. If a flexible drainpipe is jointed to the pressure relief orifice of this
valve, it must be confirmed that the flexible drainpipe is directed downwards vertically and exposed in the air.
Note! A safety valve should be installed at the water inlet of the unit.
•
Do not press the handle of the temperature and pressure valve (1).
When checking the safety function, the handle is pulled towards you
until a small amount of water is released.
•
Do not dismantle the valve.
•
Do not block the drainage pipe (2). It can cause injury, if not comply-
ing with the above instruction.
6.3

Non-return valve

The specification of the Non-return valve thread in accessories is DN20 (RC3/4"). It is used to prevent backflow of
water.
6.4

Tank affusion

After all pipes have been installed, open the cold water inlet and hot water outlet and start affusing the tank.
When the water flows out from the water outlet, the tank is full. Turn off the outlet tap and check all pipes. If there
is any leakage, repair it.
6.5

Water pressure and drainage

•
If the inlet water pressure is less than 1.5 bar, a pressure pump should be installed at the water inlet.
•
To guarantee the lifetime of the tank if the water supply hydraulic pressure is higher than 5 bar, a reducing
valve must be mounted at the water inlet pipe.
•
To minimize the risk of damage due to water leakage or because of blocked drainage, it is recommended to
use a water collector.
•
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Figure 6. Water collector
6.6

Solar energy coil electrical instruction

•
This product does not provide a solar-energy control system. It only provides two signals to be used for inte-
gration with an external solar energy control system. The installer must ensure the integration between this
product and the external solar energy control system.
•
The mainboard of the unit has two deicated ports used for connecting a solar thermal, CN17 ON/OFF and
CN18 Feedback ports. These ports ensure that the unit and solar thermal does not work simultaneously.
Position
2
1
2
3
3
Explanation
≤ 22 mm
Unit
50 mm larger than the diameter of the unit
Installation, Service and User Manual VMGFK202 – 13
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