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7.5 Gas connection
Caution
Make sure that the gas supply pipe has the correct diameter and length to supply
sufficient capacity to the water heater.
Caution
Make sure that the gas supply pipe is clean. Contamination in the pipe can cause damage
to the gas control valve, during operation.
Caution
Install the manual gas valve on a spot accessible for the user.
Install the gas connection:
Install a manual gas valve (10) in the gas supply pipe.
Make sure that the gas pipe is clean before use. If necessary, remove the
contamination from the pipe.
Close the manual gas valve.
Install the gas supply pipe to the gas control valve.
Make sure that there are no gas leaks.
7.6 Solar heating system
Note
Please refer to the installation diagram, electrical diagram and terminal block (see section
7.8.4.1)
for details of how to connect the solar heating system.
Connect the supply from the solar collector to the inlet (F) of the heat exchanger.
Connect the return pipe to the solar collector to the outlet (G) of the heat exchanger.
Connect the lead to the solar heating system controller and sensor S
2
, see:
electrical diagram and
connections table (see section 7.8.4.1).
Connect the communication cable between the solar heating system controller and
the water heater, see:
electrical diagram and
connections table (see section 7.8.4.1).
Warning
The installation diagram shows a pump station with an integrated non-return valve. This
type of pump unit may only be used with closed systems. In systems with drain-back,
installation of a pump unit with non-return valve is prohibited. There are special pump
units for these systems. Please contact the pump unit supplier for this.
7.7 Venting system
There are several alternatives for installation of the air inlet and flue gas outlet:
Installation
type
Version Description
B23 Open Air for combustion is drawn from installation room
and the flue gasses leave the water heater via a
vertical roof terminal.
C13 Closed Concentric and/or parallel venting system, with
horizontal air inlet and flue gas outlet, in same
pressure zone.
C33 Closed Concentric and/or parallel venting system, with
vertical air inlet and flue gas outlet, in same
pressure zone.
c
1.
2.
3.
4.
5.
n
1.
2.
3.
-
-
4.
-
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0311753_SGS_28-120_II_UKUK_V2.0 , 2017-05-03 59
59


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