A.O. Smith AHD 290 - Manual (Page 50)

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3.1 Water connection
During installation, regard must be paid to the dimensions of the pipes with re-
spect to the pre-existing water pressure and the pressure loss in order to ensure
sufficient pressure and water flow rates at the draw-off point.
The maximum working pressure is 10 bars, and the maximum operating tem-
perature is 65°C. If necessary, the supply pipe must be equipped with a pressure
reduction valve and possibly a filter.
As for all pressure vessels, the heat pumps connections must also be equipped
with an approved safety valve on the service side and an approved check valve
on the supply side.
All pipe work must comply with water safety regulations
3.2 Placement of pipe connections
Hot water outlet is mounted on the upper connecting branch. (¾” RG)
If the unit is used with the circulation of the hot water supply, the middle connect-
ing branch is used as a return path. (¾” RG)
Inlet of fresh cold water is mounted on the bottom connecting branch. (¾” RG)
It is recommended to use ¾” flex tube for the connection of the water connection,
to avoid possible sound from the vibration.
No holes for fittings or the like may be drilled in the product!
Such would be able to damage the functionality of the
product and cause the product to have to be scrapped!
3.3 Connection of condensation drain
While the heat pump is running, some condensation water will
occur, which is conducted to the drain connecting branch (1).
The quantity of condensation water depends upon the humid-
ity of the air going through the inlet to the heat pump.
The condensation connecting branch must be equipped with a
hose with a tight air trap, and run to a drain. The air trap must
contain a water column of at least 60 mm.
It is also possible to use other tight air traps, like a tube with
one turn.
If mounting of the air trap is omitted, water damage or
damage to the heat pump can arise! If the air trap is not
correctly mounted, the warranty will not apply!
3. Installation