4
x
Set-up and installation
4.7.9 External switching contact
Connection of an external switching contact (fig. 4-41) enables
changeover of the operating mode on the ROTEX GCU compact.
The current operating mode is switched by a changing resistance
value (tab. 4-4). The changeover of the operating mode is only ef-
fective for a long as the external switching contact is closed.
The operating mode has an effect on the direct circuit of the
ROTEX GCU compact as well as all other heating circuits con-
nected to this device as an option.
The operating mode shown on the controller display may differ
from the operating mode activated in rotary switch position
.
An operating mode activated by the external switching contact is
shown on the controller display by
"EXT."
followed by the symbol
for the operating mode (see the operating instructions for the con-
troller).
When special functions are activated, for example "Manual Oper-
ation", the input is not evaluated.
Tab. 4-4 Resistance values for evaluating the EXT signal
4.8 Connect the gas line, check the burner
setting for gas type
The ROTEX GCU compact is suitable for operation with E/H
natural gas, LL/L natural gas and liquid gas (propane).
4.8.1 Important instructions for gas connection
Gas connection
– The gas connection complies with the technical regulations
for gas installations, as well as the relevant regulations of the
destination country and the gas supply company.
– A thermally triggered blocking device (TAE) and a gas flow
monitor (GSW) with a DVGW inspection symbol must be fit-
ted. The TAE must comply with the test basis of DVGW-
VP 301. The dimensions of the GSW must comply with the
maximum adjustable rated load of the device.
Gas type
– The gas burner is set at the factory to the gas type "Natural
gas".
– Observe the permitted gas inlet pressure (resting pressure)
(see tab. 12-6).
4.8.2 Connecting the gas line
●
Connect the factory installed corrugated gas connection hose
(A) (pipe thread DIN EN 2999 Rp ½") without tension to the
gas supply line.
Fig. 4-41 Connection of EXT switching contact
Operating mode
Resistance R
V
Tolerance
Standby
< 680
Ω
± 5 %
Heating
1200
Ω
Reducing
1800
Ω
Summer
2700
Ω
Automatic 1
4700
Ω
Automatic 2
8200
Ω
The input is not considered for resistance values
greater than the value for "Automatic 2".
INFORMATION FOR CONNECTION OF A ROTEX
SOLAR SYSTEM
The
[HZU]
function integrated in the RoCon BF controller (see
the operating instructions for the controller) makes it unneces-
sary to connect the EXT connection to the burner blocking con-
tact connection of the ROTEX solar system.
DANGER OF EXPLOSION!
Escaping gas is a direct threat to human health and safety. Even
a few sparks can cause major explosions.
●
Before working on gas carrying parts, always close the
house gas stop valve.
●
If you can smell gas, air the room thoroughly. Prevent spark
and flame formation (e.g. from open flames, electric
switches or mobile phones).
●
Only heating specialists authorised and trained by the gas or
power supply company should be allowed to work on gas-
conducting parts.
WARNING!
Gases from regenerative sources (e.g. biogas) may contain
substances that cause corrosion on the gas valve and can
impair its function.
The gas composition must comply with the requirements on con-
ditions for feeding into the gas distribution grid (low-pressure
pipelines) of the public standard gas supply. Gases from regen-
erative sources (e.g. biogas) may only be used when they have
been previously prepared so that they can be fed into the public
natural gas grid in accordance with regional regulations.
The standard corrugated gas connection hose can
cause a pressure drop of up to 5 mbar. This does not
have a negative impact on the function of the ROTEX
GCU compact.
Summary of Contents for GCU compact 315
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