Connections
61
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
Fig. 57
VR1-40 to -63
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 Vitorond boiler:
Boiler Model
VR1
-40
-50
-63
20°F rise
30°F rise
USGPM
m
3
/h
USGPM
m
3
/h
14
3.2
9.3
2.1
17.2
3.9
11.5
2.6
21.5
4.9
14.3
3.2
5
6
7
1
0
4
4
v
1
.0
5
6
7
1
0
4
4
v
1
.0
Waterflow
F
lo
w
re
s
tr
ic
ti
o
n
m
3
/h
USGPM
5
22
20
50
“
w
.c
m
b
a
r
2
5
3.2
8
4
10
8
20
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
