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A.O. Smith AH 290 Manual

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The following instructions must be followed in order to ensure optimum
operation of the heat pump.
The power supply to the system must always be switched off
before opening the heat pumps cover.
When the unit has been installed for the rst time make sure the water
connections are checked after a few days to make sure there are no leaks.
Also check that the condensate drain pipe is not blocked.
Environmental considerations
When the unit is being serviced or its operation is cancelled, please make
sure to follow the guidelines for recovery and disposal of all materials
according to local procedures and laws.
3.1 Cooling system and fan
Fan:
Maintaining the fans is mainly periodically cleaning of the evaporator.
Disconnect the exible hoses from the top of the unit and unscrew the top
plate. Clean the fan with a suitable brush. Do not remove the balancing
blocks from the impeller, as this will cause imbalance and with it more noise
and fan wear.
Riskofinjuryfromsharp-edgedns!Donotdamagethisns!
Condensate drain:
When changing the lters in the autumn season, check the condensate
drain and tray for blockage by dirt. Fill water in the condensate tray and
check that the water runs out unhindered. Should this not be the case the
drain must be cleaned. At the same time make sure that the plates of the
evaporators are clean.
3.2 Water circuit and tank
Safety valve:
The installer has tted a safety valve on the cold water supply pipe for
the hot water tank. This valve is a protection of the tank against excess
pressure when the domestic water expands during heating. The non-return
valve, which is tted before the safety valve on the cold water pipe,
prevents the water from owing back into the cold water pipe. This means
that the pressure in the tank will increase to the maximum pressure
permitted by the safety valve, at which point it will open and allow the surplus
water to escape. If the safety valve did not open, the tank would burst.
To make sure that the safety valve is working properly, it should be
inspected several times a year. To do this, press the spring-loaded arm on
the safety valve and see if water comes out of the valve. Damage caused
by a blocked safety valve is not covered by the warranty.
3. Maintenance
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