Cascade Operation - Wolf MGK-2-390 Installation Instructions Manual

Cascades (overpressure), open flue
2
Flue system design
MGK-2
390 2x row
3x row
4x row
470 2x row
3x row
4x row
550 2x row
3x row
4x row
630 2x row
3x row
4x row
* Calculation and design to EN 13384-2 – kit on request
A maximum back pressure up to 50 Pa must be maintained in the connection to the header line and must not be exceeded.
Only use DIBt approved flue pipes.
In cascade operation, a Wolf cascade controller is required.
3063772_201507

27. Cascade operation

... 4
The following overview shows the maximum vertical flue length for open flue positive
pressure cascades, with different boiler combinations:
V
Nominal diameter
of connection line
to the appliance
DN250
DN250
DN250
DN250
DN250
DN250
DN250
DN250
DN250
DN250
DN250
DN250
DN250
The following basic principles are taken into
consideration in all calculations for the sizing
tables:
- Length between the individual appliances: 1.0 m
- Length after the last appliance: 2.0 m
- Pressure drops: 2 x 45° bends in the diameter of
the header pipe (optionally as lateral offset or 90°
diversion)
- Combustion air supply: from installation room
- Duct ventilation: balanced flow principle
- Geodetic height: 325 m
S A
Nominal Nominal
diameter of diameter of flue
header pipe, vertical
DN250 DN315
DN315 DN315
* *
DN250 DN315
DN315 DN315
* *
DN250 DN315
DN315 DN315
* *
* *
DN315 DN315
* *
* *
Ø /
Minimum Achievable
duct sizes height from
duct inlet to
round rectangular
duct outlet
420 mm 400 mm
420 mm 400 mm
* *
420 mm 400 mm
420 mm 400 mm
* *
420 mm 400 mm
420 mm 400 mm
* *
* *
420 mm 400 mm
* *
* *
H
50 m
42 m
*
50 m
17 m
*
22 m
50 m
*
*
23 m
*
*
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