11
5285 280 v1.0
Cascade System Guide
Set-up for Cascade System with Vitocontrol-S
(continued)
The following 4 drawings are general and provide
additional information for the different cascade systems.
These include preparing the Vitocontrol-S with the
connections to the boilers and the necessary coding
changes for a cascade system as well as various
accessories
.
Custom systems are available on request.
Configurations for 5, 6, 7 and 8 boilers are available with
a customized boiler control solutions from Viessmann.
Contact Viessmann (commercial projects) for boiler control
information and requests.
IMPORTANT
Heating Circuit / Boiler Pumps
Model WB2B 80
Flow rate
Boiler pressure drop (ft.)
Recommended pump Grundfos
20º F
r
t
26.0
16.7
* UPS 32-160/2, 115V, Speed1
25º F
r
t
20.8
9.2
UPS 26-99FC, 115V, Speed3
30º F
r
t
17.3
6.5
UPS 26-99FC, 115V, Speed2
35º F
r
t
14.9
4.8
UPS 26-99FC, 115V, Speed2
40º F
r
t
13.0
3.4
UPS 26-99FC, 115V, Speed2
Flow limitation L/h (GPM)
8000 (35.2)
Model WB2B 105
Flow rate
Boiler pressure drop (ft.)
Recommended pump Grundfos
20º F
r
t
35.0
30.0
* UPS 32-160/2, 115V, Speed3
25º F
r
t
28.0
20.0
* UPS 32-160/2, 115V, Speed2
30º F
r
t
23.3
12.5
* UPS 32-160/2, 115V, Speed1
35º F
r
t
20.0
9.0
UPS 26-99FC, 115V, Speed3
40º F
r
t
17.5
6.4
UPS 26-99FC, 115V, Speed2
Flow limitation L/h (GPM)
8000 (35.2)
We recommend the following (depending on
r
t):
* UPS 32 - 160/2 can not be installed with the manifold option.