Gas Connection; Heating Side Connection - Vaillant ecoCRAFT VKK GB SERIES Installation And Maintenance Instructions Manual

5 Installation
5.3

Gas connection

The gas installation may only be carried out by a com-
petent and qualified engineer. The legal directives and
any local regulations for gas supply companies must be
observed while doing this.
The gas supply line must be constructed in accordance
with the Gas Safety (installation and use) Regulations
and IGE UP1, IGE UP1A, IGE UP1B and IGE UP2.
Caution!
a
Leaks!
Make sure that the connection and gas pipes
are not under stress when installed to avoid
leakage in the heating installation or at the gas
connection!
• The cross-sections of the gas pipes should be selected
to suit the nominal boiler load.
Caution!
a
Damage to the gas valve!
The gas valve may be tested for leakage only
with a maximum pressure of 110 mbar! The op-
erating pressure must not exceed 60 mbar! If
these pressures are exceeded, the gas valve
may be damaged.
Fig. 5.3 Gas connection (rear of boiler)
• Connect the gas line to the gas connection (1) on the
boiler.
• Check the gas connection for leaks.
14
5.4
Fig. 5.4 Heating side connection (rear of boiler)
• Connect the heating flow to the heating flow connec-
tion (1).
• Connect the heating return to the heating return con-
nection (2).
• Fit the required isolation valves between the heating
installation and the boiler and fit the relevant safety
devices and a pressure gauge.
Caution!
a
1
If the volume of water circulating falls below
the nominal value, the temperature difference
will be too great and the burner will start to
cycle.
For this reason it is necessary to ensure the
water circulation quantities specified in
Table 5.1.
The boiler circulation pump is not integrated into the
boiler and thus must be fitted within the system.
Installation and maintenance instructions ecoCRAFT - 0020055744_03

Heating side connection

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