STIEBEL ELTRON Accelera 300 Instruction Manual download pdf (Page 20)

20 | ACCELERA® 300 HEAT PUMP WATER HEATER WWW.STIEBEL-ELTRON-USA.COM

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 ﬂ ow over the evaporator.

» Check the fan.

» Check for clogged evaporator.

» Ensure that the intake and discharge ﬂ ow are not restricted.

15. Maintenance and cleaning

Only qualiﬁ ed 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 ﬁ ns. 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 ﬁ ns. 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 ﬁ tting on the cold water

supply of the water heater.

15.3 Sacriﬁ cial anode rod

A sacriﬁ cial anode rod is inserted in the top of the water heater.

The sacriﬁ cial anode rod ﬁ tted 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

26_03_01_1025

1 Sacriﬁ cial 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.

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STIEBEL ELTRON Accelera 300 Instruction Manual Page 20

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