
Set-up
14
Minimum Clearances to Combustibles
For typical installations, Viessmann recommends installing the boiler with
clearances as published on page 15 under Recommended Minimum Clearances for
Service.
Legend
Boiler
Burner
The following are clearances to
combustibles:
Standard installation
Boiler
Model
VR1
-40
-50
-63
Rear
Sides
Flue
inches
mm
inches
mm
inches
mm
6
150
0
0
9
230
6
150
0
0
9
230
6
150
0
0
9
230
Floor
Combustibles
Alcove installation
Boiler
Model
VR1
-40
-50
-63
Rear
Sides
Flue
Top*
inches
mm
inches
mm
inches
mm
inches
mm
6
150
0
0
9
230
6
150
6
150
0
0
9
230
6
150
6
150
0
0
9
230
6
150
Floor
Combustibles
*1
Clearance of 24” / 610 mm required for burner service.
.
5
6
7
1
0
4
4
v
1
.0
min. 6” / 150 mm
m
in
.
9
”
/
2
3
0
m
m
min. 0” / 0 mm
min.
24”
610 mm
*1
Fig. 4
min. 6” / 150 mm
m
in
.
9
”
/
2
3
0
m
m
min.
24”
610 mm
*1
24” Vitotronic
installation
6” Aquastat
installation
Fig. 5