A.O. Smith AHD 290 - Manual (Page 51)

51
3.4 Air intake and exhaust
Make sure that there is sufficient free space around the heat pump.
Inlet air
The inlet air may not be polluted with aggressive components (ammonia, sulphur,
chlorine, etc.). Parts in the system may be damaged.
Air connectors
Inlet and outlet ducts must be made of smooth pipes to minimize pressure losses.
Consider the fan working pressure and the duct resistance during installation.
(See technical data.)
It is advised to install the air ducts that are placed near the heating pump, levelled
or with a light fall towards the extract air outlet to avoid leaking of condensed
water, easy to cut of. This will avoid leaking of condensed water from the ducts.
When air ducts are placed outside the building the back pressure valve (with a
small resistance) should be placed to ensure no cold air is entering the room in
the winter time and when the heating pump is standing still.
The heating pump may only be used with the tank filled up!
The unit must always be disconnected from the power before the
front door is removed. When the unit is disconnected from the
power please wait until the fan has stopped before opening the front
doors!
Before starting up the unit please ensure that all cables and electric
plugs are connected correctly and the cable and plug between the
display in the door and the circuit board are connected!
It is advised to insulate all ducts to lower heat loss and to lower the noise level.
3.5
Checking
After the installation, it is recommended that the checks be performed to ensure
that the connections are sealed and that the drainage of the
condensation water is unobstructed.