Particular Risks; Water Heater Description; Function Description - STIEBEL ELTRON ACCELERA 300 Operating And Installation Manual

OPERATION

WATER HEATER DESCRIPTION

3.6 Particular risks

3.6.1 Electric current
WARNING Electric shock
Contacting parts that carry live power is
associated with a direct risk to life. Damaging
the insulation or individual components can
result in a risk to life.
» If you detect damaged insulation,
immediately switch off the power supply
and arrange for the necessary repair.
» Have all electrical work carried out by a
qualifi ed electrician.
3.6.2 Hot surfaces
CAUTION Burning
Contact with hot components can result in
burning.
» When working near hot components, wear
protective clothing and gloves.
» The pipework connected to the hot water
outlet of the water heater can reach
temperatures in excess of 60 °C (140 °F).
3.6.3 Refrigerant
The water heater is fi lled with R134A refrigerant at the
factory.
WARNING Freezer burn
Should the water heater leak refrigerant,
avoid contact with the refrigerant or breathing
in any released vapors. Immediately vent the
room.
In normal water heater operation, the refrigerant is
contained in a sealed circuit.
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4. Water heater description
This water heater is an automatic hot water generator
with approx. 303 l (80 gallon) capacity. The hot water
temperature is factory set to 60 °C (140 °F).
After opening a hot water faucet, the hot water is pushed
out of the water heater by the incoming cold water.
This water heater works like an air conditioner but does
not need to be vented. The water heater extracts heat
from the ambient air to heat the water. The demand for
electrical energy and the heat-up time depend on the
ambient air temperature and humidity.
When installing the water heater inside, the space where
it is installed will be cooled down during the operation
by 1 to 3 °C (2 to 6 °F).
The water heater also extracts moisture from the air that
creates condensate, which must be drained off. For this
purpose, a condensate drain is integrated in the water
heater. This is where you can connect a hose to a drain.
To protect the steel tank against corrosion, the interior
is coated with a special enamel and is equipped with a
replaceable sacrifi cial anode.
Heat pump function:
A sealed circuit inside the water heater contains R134A
refrigerant (see "Specifi cation/data table"); this does not
deplete ozone, is non-fl ammable, and evaporates at low
temperatures.
In the evaporator, where heat is extracted from the
outside air, the refrigerant changes from its liquid into
its gaseous state. A compressor draws in the gas in
and compresses it. The increase in pressure raises the
refrigerant temperature and heats the water tank.
This process requires electrical energy. The energy
(motor heat) is not lost, but reaches the condenser
downstream together with the compressed refrigerant.
Here, the gas transfers heat to the water tank. An
expansion valve then reduces the pressure and the
process starts again.

4.1 Function description

4.1.1 Heat pump operation
The heat pump unit located on top of the water heater
extracts heating energy from the ambient air.
If the water heater was separated from
the power supply during operation, the
compressor will only restart if the pressure inside
the refrigerant circuit has been balanced. Pressure
balance can only be created after waiting 15 minutes.
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