26
5603 878 - 04
Vitoflex 300-RF Installation & Operating
Dimensions
Boiler Model
RF 150
RF 220
RF 300
RF 400
RF 540
a
in. (mm)
11
b
(292)
11
b
(292)
12
11/16
(323)
12
11/16
(323)
17
e
(442)
b
in. (mm)
9
7/8
(250)
9
7/8
(250)
11
7/8
(300)
13
7/8
(350)
13
7/8
(350)
c
in. (mm)
9
d
(232)
10
d
(257)
10
7/8
(277)
14 (355)
14 (355)
d
in. (mm)
14
1/16
(358)
14
1/16
(358)
13
7/16
(352)
14
c
(375)
14
c
(375)
e
in. (mm)
9
7/8
250
9
7/8
(250)
11
c
(300)
13
c
(350)
13
c
(350)
f
in. (mm)
4
7/8
(125)
4
7/8
(125)
5
7/8
(150)
6
7/8
(175)
6
7/8
(175)
Assembly instructions for the draft damper:
Note:
Before installing the draft damper, make sure to
install the draft damper door in the right orientation,
with the weight located at the bottom.
1. Cut an opening in the flue gas pipe (field supplied)
according to the flue gas pipe size (see dimensions in
the chart above).
2. Place the clamping band
C
over the flue gas pipe and
place
one of the draft damper adapters
B
over the
clamping
band
C
and mark the mounting holes on
the clamping band
C
.
3. Cut the clamping band
C
to the outside of the marked
holes and drill a
3/16
in. (4 mm) hole in each of the
marked areas of the clamping band
C
.
(refer to the chimney connection drawing above)
4. Assemble the two draft damper adapters
B
with bolt
E
and
nut
G
.
5. Fasten the clamping band
C
and the draft damper
adaptor assembly over the cut opening with bolt
H
,
washer
F
and nut
G
.
6. Insert the draft damper door
A
into the draft damper
opening (with the weight to the bottom of the door)
and fasten together with screws
D
.
7. Tighten all fasteners and seal all gaps with heat resistant
silicon [rated at 650°F (343°C)].
8. Adjust the balancing weight on the draft damper door
A
to 10 Pa or 2 in. (50 mm) from the damper door.
It is recommended to install a draft damper in the chimney
1
.
The draft damper is field supplied.
The optional draft damper can be installed in the flue gas
pipe of the biomass boiler
2
.
The draft damper should be installed in the flue gas pipe
as close as possible to the chimney not closer than 39
e
in.
(1000 mm) to the outlet of the flue gas exhaust blower.
The final position has to be arranged with the chimney
supplier. The draft damper must be installed in the heating
room together with the biomass boiler.
Chimney Connection
E
Bolt M4x30 (x2)
F
Washer (x2)
G
Nut M4 (x4)
H
Bolt M4x12 (x2)
Legend
A
Draft damper door
B
Draft damper adapter (x2)
C
Clamping band
D
Screw ST3.9x13 (x2)
Mechanical
recirculated flue gas
draft damper
