Installation; Safety Instructions For Installation; Check The Size Of The Expansion Vessel; Assembly - Bosch Condens 8300i W Installation And Maintenance Instructions Manual

Measures for hard water
To protect against increased limescale and resulting service work:
Water hardness Action
range
≥ 15 °dH/25 °f/ ▶ Set the DHW temperature lower than
2.5 mmol/l (hard) 55 °C.
≥ 21 °dH/37 °f/ We recommend:
3.7 mmol/l (hard)
▶ Installing a water treatment system.
Table 12 Measures for hard water
6

Installation

6.1

Safety instructions for installation

HRisk of death from explosion!
Escaping gas can cause an explosion.
▶ Close the gas isolator before working on any gas-carrying
components.
▶ Replace used gaskets with new gaskets.
▶ After completing work on gas-carrying components, carry out a
tightness test.
HDanger to life due to poisoning!
Escaping flue gas can cause poisoning.
▶ Performing a tightness test after working on flue gas routing
components.
HObserve the tightening torque.
Table 13 Standard tightening torque
Notification must be provided of all deviations in tightening torque.
Sizing the gas line
▶ Check on the data plate the identification of the country of
destination and the suitability for the gas type provided by the gas
supplier ( Chapter 9.6.3, table 28).
▶ Size gas supply as per AS/NZS5601.Incorrect gas pipe sizing will not
be covered by the warranty. After finishing the gas piping system, the
pipes must be thoroughly purged and leak-tested. To avoid damaging
the gas valve by excess pressure, this test must be performed with
the gas valve of the heater closed.
▶ Observe the maximum rated heat output for heating or DHW
heating according to the specifications.
▶ Determine internal diameter for the gas supply.
▶ In the case of LPG: to protect the device against high pressure, install
a pressure regulator with a pressure-relief valve.
Condens 8300i W – 6721841533 (2022/12)
G 1/2" Nm 20 (+10/‒0)
G 3/4" Nm 30 (+10/‒0)
G 1" Nm 40 (+20/‒0)
6.2

Check the size of the expansion vessel

The following graph permits the approximate estimation of whether the
installed expansion vessel is sufficient or whether an additional
expansion vessel is required (not for underfloor heating system).
The following key data was taken into account for the curves shown:
• 1 % Water seal in the expansion vessel or 20 % of the rated volume in
the expansion vessel
• Operating pressure differential for the pressure relief valve of 0.5 bar
• Pre-charge pressure of the expansion vessel corresponds to the
static system head above the wall mounted boiler.
• Maximum operating pressure: 3 bar
T[°C]
90
80
70
60
50
A
40
30
0 100 200 300
Fig. 16 Curves for the expansion vessel
[1] Pre-charge pressure 0.5 bar
[2] Pre-charge pressure 0.75 bar (default setting)
[3] Pre-charge pressure 1.0 bar
[4] Pre-charge pressure 1.2 bar
[5] Pre-charge pressure 1.3 bar
A Operating capacity of the expansion vessel
B Additional expansion vessel required
T Supply temperature
V System content in litres
▶ If the results are borderline: determine the precise vessel size
according to country-specific regulations.
▶ If the intersection is on the right beside the curve: install an additional
expansion vessel.
6.3

Assembly

6.3.1

Preparing the device installation

NOTICE
Incorrect assembly can cause material damage.
If the unit is assembled incorrectly, it may fall off the wall.
▶ This appliance is for internal use only.
▶ Only install the device on a rigid, solid wall. This wall must be able to
carry the weight of the device and must at least be as large as the
bearing surface of the device.
▶ Only use screws and rawl plugs that are suitable for the wall type and
weight of the unit.
Installation
5
B
4
3
2
1
400 500 600 700
V[l]
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