Installation - General - Wolf COB Technical Manual And Installation Instructions

Safety equipment
Hydraulics
3062547_201802
10 Installation - general
Note:
Provide a drain & fill valve at the lowest point in the system.
The COB has not been fitted with an expansion vessel at the factory. This must be fitted
externally (available from the Wolf accessories range). The expansion vessel must be
sized sufficiently, in accordance with DIN 4807.
There should not be a shut-off valve between the expansion vessel
and the oil condensing boiler, because otherwise the pressure build-up
would permanently damage the boiler during heating. There is a risk of
system components rupturing, giving rise to a risk of scalding.
This does not include butterfly valves upstream of the expansion vessel. The safety
assembly from the Wolf accessories range includes an integral 3-bar safety valve. Route
the discharge pipe into a drain outlet.
The minimum system pressure is 1.0 bar.
The oil condensing boiler is permitted exclusively for sealed systems of up to 3 bar.
The maximum flow temperature is factory-set to 75°C and may be adjusted to 90°C if
required. In DHW mode, the max. flow temperature is factory-set to 80°C and may be
adjusted to 90°C if required.
It is only possible to refrain from using a minimum flow rate at
Note
temperatures lower than 80°C, to prevent damage to the heat exchanger
from overheating and steam knocking.
The return line to the appliance must have a dirt trap. A sludge separator
Note
with magnetite separator should be used to protect the appliance and
the high efficiency pump from dirt/sludge and magnetite.
Deposits in the heat exchanger may lead to boiling noise, a drop in
performance or faults in the appliance.
Before commissioning, carry out a tightness test on all hydraulic
Note
pipework:
If the appliance is not watertight, there is a risk of leaks and resulting
material losses.
Test pressure on the heating water side max. 4 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 4.5 bar.
The maximum flow rate must not exceed 6000 l/h (100 l/min)
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