STIEBEL ELTRON Accelera 300 - Manual (Page 22)

22 | ACCELERA® 300 HEAT PUMP WATER HEATER WWW.STIEBEL-ELTRON-USA.COM
INSTALLATION
MAINTENANCE AND CLEANING
15.4 Descaling
» Close the shut-off valve in the cold water supply to the tank.
» Draw water from the tank to relieve the pressure inside the
water heater.
CAUTION : Risk of electric shock Use copper conductors only
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1 Low pressure fill port
2 High pressure fill port
3 Booster heater flange
» Unscrew the booster heater flange and remove element.
» Immerse scaled sections of the heater element into a
descaling liquid (for example citric acid), until the limescale
has dissolved.
» Flush the descaling liquid (white vinegar is another example)
off and allow the immersion heater element to dry.
15.5 Checking valves
15.5.1 Safety valve (on-site provision)
For reasons of safety, it is necessary to check the T&P valve for
proper function from time to time.
» Crack open the safety valve until a full jet of water is
discharged.
» Close the safety valve when the check is complete.
How quickly limescale builds up depends on the local water quality
and the hot water temperature. As your local licensed installers
are familiar with your local water quality, let them determine the
timing of the next service.
15.5.2 Pressure reducing valve (on-site provision)
» Check the on site pressure relief valve for function. If
required, replace the valve.
15.5.3 Checking refrigerant levels
» When checking refrigerant levels at fill ports be sure to use
new crush washers (supplied with unit).
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