Safety Equipment; Combustion Chamber; Heating Water - Wolf CGB-75/100 Installations- Und Planungshinweise

When replacing the heat exchanger, the boiler coding card on the control board as well as the
superior displacer of heat-resistant fine steel have to be changed.
Note:
Provide a BDF valve at the lowest system point.

Safety equipment

The minimum system pressure is 1.0 bar.
The gas condensing boiler is approved exclusively for sealed
systems of up to 6 bar. The maximum flow temperature is
factory-set to 80 °C and may be adjusted to 90 °C if required.
Generally, the flow temperature is 80 °C for DHW operation.

Combustion chamber

In order to provide an operation without disturbance when
replacing the heat exchanger, the superior displacer of heat-re-
sistant fine steel has to be changed as well (Mat.no.:8615547).
The new displacer comes with the spare heat exchanger.

Heating water

General requirements
There is a risk of damage to the boiler resul-
ting from water leaks, poor heat transfer or
corrosion.
- Before connecting the gas condensing boiler, flush the
heating system to remove residues such as welding pearls,
hemp, putty, sludge sediments, etc. from the pipework
- Clean the dirt trap
- The automatic air vent valve for the appliance must be ope-
ned during operation
- The max. flow rate of 100 l/min (6000 l/h) must not be ex-
ceeded
- Domestic hot water or partially desalinated domestic hot
water should be used as fill water and top-up water
- If an ingress of oxygen cannot be ruled out, a system sepa-
ration is advisable
- Heating water pH value must be between 6.5 and 8.5
- Limitation of the fill water hardness:
Min. 2 °dH, max. 11 °dH, at > 10 l/kW see Design information,
water treatment
- De-scaling using single-stage ion exchangers is not per-
missible. For permissible methods, see Design information,
water treatment
- Inhibitors and antifreeze are not permissible
- A system log must be kept (see Design information, water
treatment)
6
Installation
Additional requirements for operation without a low loss
header
- Systems with only one CGB-75/100 - Boiler
- Sludge separator in the boiler return of the
- Desalination of the heating water to < 3 °dH
- Control of the cylinder heating only via the MM module
- Cylinder primary pump at least DN 25 with at least 6 m
- The max. flow temperature must be adjusted with parameter
The manufacturer does not assume liability for any damage
to the heat exchanger caused by oxygen diffusion in the hea-
ting water. In the event of oxygen penetrating the system, we
recommend a system separation through the interconnection
of a heat exchanger.
Information on scaling
Scaling can be strongly influenced particularly through the
method of commissioning. Heat the system at the lowest
output with an even and adequate throughput. For multi-boiler
systems it is recommended to commission all boilers simulta-
neously to prevent the overall amount of lime concentrating on
the heat exchanger surface of an individual boiler.
CGB-75/100 - Boiler
(configurations 1 and 10)
head
HG08 to 75 °C
The design information for water treatment must
be observed, otherwise system damage due to
water leaks may occur.
Before commissioning, all hydraulic pipes must
undergo a tightness test:
Test pressure on heating water side max. 8
bar.
Prior to testing, close the shut-off valves in
the heating circuit for the appliance, because
otherwise, the safety valve (accessory) opens
at 3 bar. The appliance has already been tested
at the factory for tightness at 6 bar.
If the appliance is not watertight, there is a risk
of leaks and resulting material losses.
The maximum flow rate must not exceed
6000 l/h (100l/min).
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