iNSTallaTiON
Installation
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10.1.1 Safety equipment
A T&P valve or a cold water expansion control valve, or both, must
be installed. Observe local and regional regulations.
T&P valve ( 850 kPa )
D0000063547
1 2
1 T&P valve
2 Reducer from R3/4 male thread to Rp1/2 female thread
If specified, install a type-tested T&P valve with reducer at
the "T&P valve" connection provided on the appliance.
The response pressure of the valve must be below or equal to the
permissible operating pressure of the DHW cylinder. The valve
protects the appliance against unacceptable excess pressure or
temperature. The diameter of the cold water supply line must not
be greater than the diameter of the valve.
Ensure that the expansion water escaping from the valve can
drip into a drain, e.g. a funnel or tundish.
Ensure the drain cannot be shut off.
Size the drain pipe so that water can drain off unimpeded
when the safety valve is fully opened.
Ensure that the drain pipe of the safety valve is open to the
outside.
Fit the drain pipe of the safety valve with a constant down-
ward slope and in a location free from the risk of frost.
Safety valve (cold water expansion control valve)
If specified, install a type-tested 550kPa safety valve (expan-
sion control valve) in the cold water supply line.
The safety valve protects the appliance against unacceptable ex-
cess pressure. The diameter of the cold water supply line must not
be greater than the diameter of the safety valve.
Ensure that the expansion water escaping from the safety
valve can drip into a drain, e.g. a tank or funnel.
Ensure the drain cannot be shut off.
Size the drain pipe so that water can drain off unimpeded
when the safety valve is fully opened.
Ensure that the drain pipe of the safety valve is open to the
outside.
Fit the drain pipe of the safety valve with a constant fall in a
room free from the risk of frost.
10.1.2 Pressure reducing valve
The maximum pressure in the cold water supply line must be at
least 20% below the lowest response pressure of all installed T&P
valves. Otherwise a pressure reducing valve is required. If this is
the case, install a pressure reducing valve in the cold water supply
line. The pressure reducing valve must be set to 540kPa if a safety
valve is installed; otherwise to 700kPa.
10.1.3 Drain valve
Install a suitable drain valve at the lowest point in the cold
water supply line.
10.1.4 Thermal insulation
Insulate the DHW line and valves against heat loss and to im-
prove energy efficiency in accordance with locally applicable
regulations.
Insulate the cold water supply line to prevent condensate
forming.
10.1.5 DHW outlet
WARNING Burns
The water in the DHW cylinder can be heated to temper-
atures in excess of 60°C. There is a risk of scalding at
outlet temperatures in excess of 43°C.
In Australia and New Zealand, observe regulations in
accordance with AS/NZS3500.4:
Install a temperature limiter in all systems intended
for personal hygiene, e.g. balancing valve, thermo-
static mixing valve.
10.2 Condensate drain
Install a condensate drain hose in order to remove the condensate
which forms.
Connect the condensate drain bend included in the standard
delivery to the "Condensate drain" connection.
Connect a condensate drain hose to the condensate drain
bend.
A siphon must be installed to prevent aggressive gases from the
sewer entering the appliance. The condensate drain must be in-
stalled with an outlet that opens freely above the siphon.
!
Material losses
Ensure condensate cannot back up.
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 kinked.
Route the condensate drain hose with a continuous
fall.
The condensate drain must be open to atmosphere.
Use a suitable condensate pump if there is insufficient fall.
Take the building characteristics into account.
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