Operation Outside The Limits Of Use - STIEBEL ELTRON WWK 300 Bedienungs Und Installationsanleitung Handbuch

OPERATION
Appliance description
Minimum runtime and minimum OFF time
Material losses
!
When operating with external switching devices that can
interrupt the power supply to the appliance, such as time
switches, energy management systems or domestic auto-
mation systems, observe the following conditions:
- The minimum runtime is 60 minutes.
- The minimum OFF time following a shutdown is 20
minutes.
- The appliance should not be switched on/off more
than 10 times per day.
- The external switching device must have a minimum
breaking capacity of 240 V~ / 16 A / AC3.
3.1.2 Booster heater
You can accelerate the heating-up process with the electrical
supplementary heater, if the DHW demand increases or if the
appliance has previously been switched OFF and you require hot
water as quickly as possible. For reasons of saving energy, the
electrical supplementary heater only heats the top third of the
cylinder capacity (approx. 100 litres). This takes approx. 2 hours.
In SOL versions, approx. 50 litres are heated up due to the flange
being positioned higher up on the cylinder.
The electrical supplementary heater is switched ON when the
actual temperature falls below 58 °C and is switched OFF when
65 °C are exceeded.
Press the push button only once if you want to activate the
electrical supplementary heater only to cover a peak demand.
3.1.3 Boiler operation via heat exchanger (only for SOL
version)
A heat exchanger, which is generally connected to a central heating
system, is integrated into the cylinder. Subject to the heating
water flow temperature, the entire cylinder capacity should be
heated up by the heat exchanger in between 3 and 4 hours.
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3.2

Operation outside the limits of use

Room temperature below 6 °C to 4 °C
Subject to the relative humidity and the DHW temperature
inside the cylinder, the evaporator begins to ice up below a
room temperature of 6 °C. When the evaporator is covered in
hoarfrost, the frost stat N2 (see wiring diagram) shuts down the
compressor, whilst the fan continues to operate, thereby defrosting
the compressor. The compressor starts again automatically after
the defrosting process has been completed, and the heat pump
operation continues.
The minimum temperature required for the heat pump operation
is +4 °C. The evaporator is defrosted upon demand at operating
temperatures between +4 and +6 °C. This increases the heat-up
time.
Room temperature higher than 35 °C
The heat pump will be switched OFF by safety equipment at
room temperatures above approx. 35 °C. The heat pump will be
re-started automatically after a brief cooling down period. The
heat pump will be switched OFF again if the room temperature is
still higher than 35 °C.
Note
Take appropriate steps to prevent the ambient tempera-
ture rising above 35 °C.
WWK 300 / WWK 300 SOL | 21