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Mechanical
Chimney Connection
It is recommended to install a draft damper in the chimney
The draft damper is field supplied.
The optional draft damper can be installed in the flue gas
pipe of the biomass boiler
The draft damper should be installed in the flue gas pipe
as close as possible to the chimney not closer than 39e 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.
Dimensions
Boiler Model
a
in. (mm)
b
in. (mm)
c
in. (mm)
d
in. (mm)
e
in. (mm)
f
in. (mm)
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
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.
26
2
.
RF 150
RF 220
11b (292)
11b (292)
9
(250)
9
7 / 8
7 / 8
9d (232)
10d (257)
14
(358)
14
1 / 16
1 / 16
9
250
9
7 / 8
7 / 8
4
(125)
4
7 / 8
7 / 8
in. (4 mm) hole in each of the
1
.
recirculated flue gas
RF 300
12
(323)
11 / 16
(250)
11
(300)
7 / 8
10
(277)
7 / 8
(358)
13
(352)
7 / 16
(250)
11c (300)
(125)
5
(150)
7 / 8
Legend
A Draft damper door
B Draft damper adapter (x2)
C Clamping band
D Screw ST3.9x13 (x2)
Vitoflex 300-RF Installation & Operating
draft damper
RF 400
12
(323)
17e (442)
11 / 16
13
(350)
13
7 / 8
14 (355)
14c (375)
14c (375)
13c (350)
13c (350)
6
(175)
7 / 8
E Bolt M4x30 (x2)
F Washer (x2)
G Nut M4 (x4)
H Bolt M4x12 (x2)
RF 540
(350)
7 / 8
14 (355)
6
(175)
7 / 8
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