STIEBEL ELTRON Accelera 300 E - Manual (Page 11)

OPERATION
Settings
www.stiebel-eltron-usa.com Accelera® 220-300 E | 11
EN
GL
ISH
3.1 Heating the DHW tank
The water is heated by the heat pump through the condenser
wrapped around the tank. This is the appliance’s standard mode
of operation.
An integral sensor in the tank is connected to an electronic device
to measure the thermal energy content of the water in the DHW
tank. The water in the DHW tank is heated if its temperature is
lower than the set temperature.
For information on the heat-up time of the water in the DHW tank,
See 15.3, “Data table”, pg. 29.
3.1.1 Electric booster element
The electric booster element is automatically activated in case
of a damaged heat pump or to provide more hot water than the
current tank supply.
In the event of an unexpectedly high hot water demand, the boost-
er heater can be manually activated. See 4.4.1, “Comfort heating”,
pg. 13.
In the event of an appliance fault, a backup mode can be set to
activate the electric booster element. See 4.4.2, “Emergency back
up mode”, pg. 13.
3.2 Appliance operation outside the application
limits
3.2.1 Ambient temperatures below the application limit
If hoar frost is growing on the evaporator fi ns, the hoar frost
temperature monitor switches the heat pump compressor off.
The compressor switches on automatically once the evaporator
defrosts.
  To guarantee fault-free operation of the appliance, make sure
you operate the appliance within its application limits (See
15.3, “Data table”, pg. 29).
Note
Heat-up times are longer while the evaporator is defrost-
ing.
3.2.2 Ambient temperatures above the application limit
The safety equipment switches the appliance off if the upper ap-
plication limit is exceeded.
Following a cooling time of several minutes, the appliance is
switched back on automatically. The appliance is switched off
again if the ambient temperature rises above the permissible tem-
perature value again.
  To guarantee fault-free operation of the appliance, make sure
you operate the appliance within its application limits (See
15.3, “Data table”, pg. 29).
3.3 Frost protection
The appliance activates a frost protection function if the integral
sensor in the DHW tank detects a temperature below 50°F/10°C.
The appliance then heats the water in parallel mode by using both
the heat pump and the electric booster element. The heat pump
and electric booster element switch off once the temperature de-
tected by the integral sensor is more than 65°F/18°C.
4. Settings
4.1 Display and controls
Note
The back-light of the display will illuminate for 15 seconds
after pressing any button.
e l c t r o n i c c o m f o r t
1
3
5
12
10
8
26
_0
3_
13
_0
0
0
6_
c o m f o r t o m f o r t
4
2
7
6
11
e l c t r o n
2 2
1
9
1 Set temperature symbol
2 Amount of amount of mixed water display (l
@ 40°C /gal @
1 04°F)
Actual temperature display, upper tank section /
Set temperature 1 display
Set temperature 2 display
Fault code display
3
Plus key
4 Minus key
5 Service/error symbol
6 Electric booster element symbol
7 Heat pump symbol
8 Rapid heating key
9 Set temperature 2 symbol
10 Menu key
11 Amount of mixed water symbol
12 Actual temperature symbol
The "electric booster element" and "heat pump" symbols are dis-
played when these appliance components are active. The display
of these symbols does not necessarily mean that the electric boost-
er element and the heat pump are running.
Service/fault symbol
Note
Notify your contractor if the service/fault symbol ap-
pears on the display. Continuous illumination of the
symbol indicates that the fault is not preventing appli-
ance operation.
A fl ashing service/fault symbol indicates that the water
is not being heated and that it is essential you notify
your contractor.
4.2 Settings
In standard display mode, the display shows the current amount
of mixed water.