Connections
24
Installation Examples
General
The schematics on the following pages
are to be seen as guidelines only. They
further do not display all system
varieties, safety devices, or concepts
possible. Specific system layouts may
be further discussed with the local
Viessmann sales representative office.
Clearances
A minimum of 2” circumferential
clearance from non-insulated hot water
pipes to combustible construction must
be maintained. In cases where the pipes
are insulated with pipe insulation of
appropriate and sufficient thickness and
insulation values, the above clearance
may be reduced to 0”.
Waterside flow
Flow rates
The relationship between boiler flow rate and temperature rise is according
to the formula:
Boiler output (Btu/h) = 500 x flow (USGPM) x Rise (°F)
The following chart lists typical flow rates for the Vitola boiler:
Boiler Model VB2 -18 -22 -33 -40 -50 -63
20°F rise
30°F rise
USGPM
m
3
/h
USGPM
m
3
/h
7.5
1.7
5.0
1.1
9.7
2.2
6.4
1.4
12.2
2.8
8.1
1.8
15.4
3.5
10.2
2.3
20.0
4.5
13.2
3.0
25.7
5.8
17.2
3.9
5167 404 v1.9
For underfloor heating applications,
an additional immersion or strap-on
aquastat must be installed in the low
temperature underfloor loop (ahead of
the mixing valve) to de-energize the
pump and/or boiler to prevent
overheating. High water temperatures
can damage concrete slabs.
CAUTION
Waterflow
Flow restriction
m
3
/h
USGPM
5
22
20 50
“w.c.
mbar
25
3.2 8
410
820
12 30
16 40
0.4 1
0.8 2
1.2 3
1.6 4
0.5
2.2
1
4.4
2
9
3
13
4
18
6
26
7
31
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