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Item
Name
6
Gas connection line
7
Gas connection G ½" IG with connected gas hose
8
Safety gas control block
9
Gas valve connection adapter
10
Condensate pipe with overfill protection
11
Flue gas collector
12
Securing clip for gas connection line (2x)
13
Supply air manifold
14
Boiler body
15
4× fixing screws (burner blower/burner flange)
16
3× fixing screws (Venturi nozzle)
17
2× O-ring (Venturi nozzle - gas connection line - con-
nection adapter)
18
Seal (burner blower/burner flange)
19
6× fixing screws (burner blower/boiler body)
for GCU compact 524 / 528 (Biv))
20
Burner flange seal
21
Seal for burner surface
22
Burner surface
23
Flue gas collector seal
24
O-ring (burner blower - Venturi nozzle)
25
2× fixing screws (flue gas collector/boiler body)
26
Ignition electrodes seal
27
2× fixing screws (ignition electrodes)
28
Ionisation electrodes seal
29
2× fixing screws (ionisation electrodes)
30
2× fixing screws (connection adapter for gas valve)
31
Seal (connection adapter/gas valve)
32
Locking plate for gas valve
33
1× fixing screw (locking plate/connection adapter for
gas valve)
34
Seal (gas hose - safety gas control block)
35
Ignition transformer
Tab. 7-1
Legend for
Fig. 7-1
to
Control of the burner output
The controller continuously determines the required inflow temperat-
ure corresponding to the configured operating parameters and
passes this value to the combustion control of the burner. The com-
bustion control uses the set value and the values for the flow and re-
turn temperature sensors to calculate the required burner power.
The determined output is passed to the burner fan as a PWM signal.
The burner fan immediately adjusts the gas fan speed and, with that,
the combustion air flow. The gas controller controls the gas volume
accordingly.
CM434 combustion control
The CM434 gas-fired combustion control controlled by a micropro-
cessor controls and monitors the firing program and the temperature
sensors for the inflow and return temperatures.
7.2
Safety function
Fault shutdown and fault indicator
You can find an overview of locking and temporary fault shutdowns
in
Chap.
10.3,
Tab. 10-2
to
Tab.
Gas Combi Unit
Floor-standing gas condensing boiler with integrated heat storage
008.1543899_02 – 04/2019 – EN
(7×
Fig. 7-3
10-4).
7
Heat cell with gas burner
INFORMATION
A locking fault can only be reset manually on the controller
of the GCU compact (see
INFORMATION
With a temporary fault shutdown, the burner is switched off
for at least 60 secs.
When the above conditions are back in the normal working
range, a burner release is carried out automatically
A fault is indicated
▪ by the red backlight on the display,
▪ by a clear text fault message with the fault code on the display of
the control section.
Unlocking the burner
INFORMATION
The cause of the last fault is saved in the device and can
be reconstructed, even after power failure, when the
device is restarted.
Locking errors detected by the combustion control can only be re-
leased manually directly on the boiler.
Requirements: The cause of the fault has been rectified, the burner
is connected to the electrical system.
1
Switch on the GCU compact.
2
Push the Exit button
(Fig.
6-1, Item 13) for at least 5 secs.
è The "Special Level" menu is displayed.
3
Use the rotary switch to select the "FA failure" level.
è The fault code and "Reset?" request are displayed.
4
Select "Yes" with the rotary switch.
5
Confirm the changes with a brief push of the rotary switch.
è The error is reset.
6
Cancel and jump back by pushing the Exit button again.
7
If there are several successive fault shutdowns, check the heat-
ing system (e.g. flue system, fuel supply).
INFORMATION
If more than 5 faults are reset within a 15 minute period,
the fault code E96 is displayed. Another release in then
only possible after 15 mins.
7.3
Burner setting
DANGER: RISK 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-conducting parts, always close
the house gas stop valve.
▪ If there is a smell of gas, air the room thoroughly. Pre-
vent 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.
CAUTION
An improperly adjusted gas burner can lead to a prohibited
level of pollutant emissions, heavy contamination and
higher gas consumption.
▪ Burner setting should be carried out only by authorised
and recognised heating engineers.
Chap.
10.4).
Installation and operating instructions
45
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