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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
Copper pipe
Steel pipe
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.
10.1.1 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.
20
| Accelera® 220-300 E
DHW outlet
Copper pipe
Steel pipe or copper pipe
PEX tubing
10.1.2 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).
10.1.3 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.
10.1.4 Drain valve
Install a suitable drain valve at the lowest point in the cold
water inlet line.
10.1.5 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.
10.3 Power supply
WARNING Electrocution
Carry out all electrical connection and installation work
in accordance with national and regional regulations.
WARNING Electrocution
If the appliance is permanently connected to the power
supply, ensure that the appliance can be separated from
the power supply by an isolator that disconnects double
terminal with at least
disconnect switches or circuit breakers can be used for
this.
WARNING Electrocution
Observe the safety regulations to prevent contact
with dangerous 'live' parts.
1 /8 ˝
/4 mm contact gap. Contactors,
www.stiebel-eltron-usa.com
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