Mechanical Room; Minimum Clearances; Minimum Clearances To Combustibles; Recommended Service Clearances - Viessmann Vitocrossal 300 CT3 Series Installation Instructions Manual

Vitocrossal 300, CT3 Series Installation

Mechanical Room

The Vitocrossal 300, CT3 boiler should be located in
a heated indoor space. The boiler should also be located
near a floor drain and as close as possible to the vertical
chimney or vent.
Whenever possible, install boiler near an outside wall so
that it is easy to duct fresh air directly to the boiler area.
Install boiler on flooring capable of supporting the weight
of the boiler filled with water.

Minimum Clearances

z
w
20 in.
20 in.
(500 (500
mm) mm)
x
y
Legend
A Boiler
B Burner
Boiler model CT3-
V in. (mm)
(711)
W in. (mm)
62c
(1593)
X in. (mm) 36b
(930)
Y in. (mm)
(1012)
Z in. (mm) 41a
(1048)
A
v
B
Length of
burner
17 22
28 28
(711) (711)
65c
(1752)
(1671)
39a 43a
(1000) (1100)
40 40
(1012) (1012)
41a 41a
(1048) (1048)
Do not use exhaust fans without adding additional
provisions for fresh combustion air (e.g. fresh air fan) in
the boiler room and do not install the Vitocrossal 300
boiler in rooms with refrigeration equipment. This boiler
requires uncontaminated air for safe operation - do not
install where chemicals are stored.

Minimum Clearances to Combustibles

Boiler model
CT3-
Top
Sides
Flue
Front
Floor

Recommended Service Clearances

To enable convenient installation and maintenance,
observe the stated clearance dimensions. Maintain the
minimum clearances where space is tight. In the factory
8 in. set condition, the boiler door opens to the right. You can
(200 mm)
relocate the hinge bolts so that the door can open to the
left.
Mechanical room
H Do not operate when air is polluted with halogenated
hydrocarbons (e.g. as in aerosols, paints, solvents and
cleaning agents)
H Prevent very dusty conditions
H Prevent high levels of humidity
H Prevent freezing and ensure good ventilation
Otherwise, the system may suffer faults and damage.
28 37
28 35
(889) (889)
69 72
(1828) (1906)
59
(1500) (1500)
40
44b 44b
(1128) (1128)
45a 45a
(1149) (1149)
17 22 28 37
6 in. (150 mm)
6 in. (150 mm)
As per vent manufacturer's specification
6 in. (150 mm)
combustible
46 57
35 39
(991) (1143)
75
81a 85b
(2062) (2172)
59 59
(1500) (1500)
44b
(1243)
(1128)
45a
(1219)
(1149)
Set-up
46 57 72 89
72 89
45 45
(1143)
93a
(2366)
59 59
(1500)
49 49
(1243)
48 48
(1219)
9