STIEBEL ELTRON Accelera 300 - Manual (Page 21)

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WWW.STIEBEL-ELTRON-USA.COM ACCELERA® 300 HEAT PUMP WATER HEATER | 21
INSTALLATION
MAINTENANCE AND CLEANING
The safety high pressure limiter shuts down the compressor if
the pressure inside the refrigerant circuit exceeds the permissible
maximum value. The safety high pressure limiter may also trip if
the water heater is operated above its permissible limit, i.e. above
an air temperature of 42 °C (107 °F). (See above)
The safety pressure limiter also trips if the heat pump thermostat
fails.
» After the cause of the fault has been removed, reset the
safety pressure limiter by pressing the reset button.
14.1.3 Protective motor switch - klixon
The protective motor switch will shut down the compressor if it is
overloaded because of excessive thermal load. Remove the cause.
After a short cool-down phase, the protective motor switch will
restart the compressor automatically.
14.2 Troubleshooting
14.2.1 Excessive power consumption
» Lower the temperature of the booster heater.
14.2.2 The room temperature falls excessively
One possible cause is an inadequate air flow over the evaporator.
» Check the fan.
» Check for clogged evaporator.
» Ensure that the intake and discharge flow are not restricted.
15. Maintenance and cleaning
Only qualified licensed installers must carry out maintenance work
in accordance with these instructions.
WARNING Electric shock
Maintenance work, such as checking the electrical
safety, must only be carried out by an electrician.
Always disconnect the power supply before working
on the water heater.
15.1 Cleaning the evaporator
WARNING Injury
The evaporator has many sharp-edged fins. When
cleaning the evaporator, proceed with caution and
wear protective clothing, in particular safety gloves.
Maintaining the full output of the water heater at all times requires
an occasional professional cleaning of the evaporator.
» Undo the screws that connect the water heater cover and
remove.
» Carefully clean the evaporator fins. Only use water and a soft
brush. Never use acidic or alkaline cleaning agents.
15.2 Draining the tank
WARNING Scalding
Hot water can be expelled when draining the tank.
» Close the shut-off valve in the cold water line.
» Fully open the hot faucets at all points.
The tank is drained via the cold water supply. Some residual water
will remain in the bottom of the tank.
» Open the drain valve (see chapter 10.7, "Water connection").
If a drain valve was not installed, undo the fitting on the cold water
supply of the water heater.
15.3 Sacrificial anode rod
A sacrificial anode rod is inserted in the top of the water heater.
The sacrificial anode rod fitted at the factory is approx. 1260 mm
(50") long.
The timing of the anode inspection is subject to the local water
quality and is determined by your local licensed installer. We
recommend that the anode is checked no later than 12 months
after initial start-up.
CAUTION : Risk of electric shock Use copper conductors only
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1 Sacrificial anode rod
If the anode is used up, you will need to replace it. Should it prove
impossible to install an anode rod (length approx. 1260 mm (50")),
install a segmented anode.
Description Part #
Anode rod 278235
Segmented anode rod 143498
During the anode rod installation ensure a clean metal-conducting
connection between the anode and the tank.