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| Accelera® 220-300 E www.stiebel-eltron-usa.com
INSTALLATION
Installation
11.1.2 Pressure reducing valve
Note
A 70 psi (4.8 bar) pressure reducing valve must be in-
stalled to ensure the pressure of the incoming water line
never exceeds 70 psi (4.8 bar).
11.1.3 Check valve
Install a check valve in the cold water line (after the pressure re-
ducing valve if installed). This check valve is necessary to prevent
water from fl owing backwards into the cold water piping.
11.1.4 Drain valve
Install a suitable drain valve at the lowest point in the cold water
inlet line.
11.1.5
Thermal insulation
Insulate the DHW line against heat loss in accordance with locally
applicable regulations.
11.1.6
Recirculation loop
Stiebel Eltron advises against the installation of this appliance in
any recirculation loop. If a recirculation loop is required, you may
plumb the return line of the recirculation loop back in through the
T&P valve port of the appliance. The T&P valve may not be omitted
so a Tee must be used in this confi guration. Be sure that the T&P
valve probe is submerged suffi ciently.
Always install a recirculation loop with a thermostat cut-off or a
timer. Installation without these devices will cause the appliance
to run continuously, resulting in high electricity use and extended
compressor run times which will reduce the life of the appliance
and void the warranty.
Note
The Accelera energy effi ciency will drop when installed
with a recirculation loop due to the reduction in thermal
stratifi cation of the tank. Contact Stiebel Eltron technical
support for additional questions.
11.2
Condensate
drain
Install a condensate drain hose to remove the condensate which
forms.
Connect the condensate drain included in the standard deliv-
ery to the “condensate drain” connection.
Connect a condensate drain hose to the condensate drain
bend.
!
Material losses
Ensure condensate drain cannot retain water.
Use a condensate drain hose with a diameter great-
er than the diameter of the condensate drain bend.
Ensure the condensate drain hose is not bent.
Route the condensate drain hose with a continuous
base slope.
The condensate drain must be open to the atmosphere.
Use a suitable condensate pump if there is insuffi cient base
slope. Observe the building characteristics.
11.3 Choosing the operation mode
The appliance is shipped from the factory set to Automatic Mode
(See 5.3, “Changing mode of operation”, pg. 14). If the appliance
needs to be set to Heat Pump Only Mode this should be selected
before commissioning the appliance.
To switch the active mode, the top and side covers must be re-
moved (See 15.1, “Removing the appliance cover”, pg. 27 & See
15.2, “Removing the casing ring”, pg. 28).
WARNING Electrocution
Ensure that the appliance is disconnected from its power
supply before changing the operation mode or perform-
ing any other service.
1
1 Control board cover
Remove the cover from the control board.
1
1
1
1 Operation mode DIP switches
