STIEBEL ELTRON Accelera 300 E - Manual (Page 19)

www.stiebel-eltron-usa.com Accelera® 220-300 E | 19
EN
GL
ISH
INSTALLATION
Installation
10. Installation
!
WARNING Injury
Incorrect installation can lead to serious personal injury
or material losses.
Before any work, ensure suffi cient clearances for the
installation.
Handle sharp-edged components carefully.
10.1 Water connection
!
Material losses
Carry out all water connection and installation work in
accordance with local plumbing regulations.
The following material combinations are approved for pipework
installations:
Cold water inlet DHW outlet
Copper pipe Copper pipe
Steel pipe Steel pipe or copper pipe
PEX tubing PEX tubing
  Thoroughly fl ush the pipework before connecting the ap-
pliance. Foreign bodies, such as welding pearls, rust, sand
or sealant can impair the operational reliability of the
appliance.
!
Material losses
To protect the connection nipples against corrosion the
water tube connection must be made with plumber’s
thread seal tape (PTFE). The use of hemp on nipple
threads is not permissible.
Safety valve
The appliance is a sealed unvented DHW tank. The appliance is
supplied with a temperature and pressure relief valve that has
been factory installed and leak-tested.
  Install a type-tested safety valve in the cold water supply
line. The response pressure of the safety valve must be below
or equal to the permissible operating pressure of the DHW
tank.
The safety valve protects the appliance against unacceptable ex-
cess pressure.
  Ensure that the expansion water escaping from the safety
valve can drip into a drain, e.g. a tank or sink.
Ensure the drain cannot be shut off.
  Size the drain in a way that water can drain off unimpeded
when the safety valve is fully opened.
  Ensure that the discharge pipe of the safety valve is open to
atmosphere.
  Fit the discharge pipe of the safety valve with a constant
downward slope and in a room free from the risk of frost.
Pressure reducing valve
The maximum pressure in the cold water supply line must be at
least 20% below the response pressure the safety valve. If the
maximum pressure in the cold water supply line is higher, install
a pressure reducing valve.
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.
Drain valve
  Install a suitable drain valve at the lowest point in the cold
water inlet line.
DHW circulation
The heat losses incurred in a DHW circulation line and the elec-
trical power consumption of the circulation pump reduce the effi -
ciency of the system. The cooled water in a circulation line mixes
with the tank content. Where possible, avoid installing a DHW
circulation line. Where that is not possible, the DHW circulation
pump must be controlled thermally or by time switch.
Thermal insulation
  Insulate the DHW line against heat loss in accordance with
locally applicable regulations.
10.2 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.