The Exterior Wall Duct With Telescopic Inlet Pipe; Installation Of The Wall Duct With Telescopic Inlet Pipe - Dru Verwarming NL 31 Instructions D'installation Et Mode D'emploi

sheet up to the wall. Press the inlet pipe back in such a
way that the end of the pipe is level with the turned-back
edge of the mounting sheet.
From the outside, bring the wall grid with its attached
tension members into the inlet pipe. Bend the tension
members a little outwards, so that they will jam slightly
in the inlet pipe, keeping the grid in its place. Keep the
mark "Top" up when placing the wall grid. Slide the two
fastening clamps (5) over the tension members (6), taking
care that the fastening clamps catch on the turned-back
edge of the mounting sheet. Fix the screw-nuts onto the
tension members and tighten them by hand. Place the fas-
tening clamps onto the horizontal centre line of the inlet
pipe. See also the marks in the mounting sheet.
The exterior wall duct with telescopic inlet
pipe
This is suitable for wall thicknesses of 250 – 440 mm
without shortening the parts of the inlet pipe. By short-
ening the pipe's parts, this exterior wall duct can be
adapted for thicknesses of 70 – 250 mm. The outlet pipe
should be adjusted. The tension members attached to
the wall grid can be shortened after the wall duct has
been mounted. If the telescopic inlet pipe is applied for
wall thicknesses of 70 – 250 mm, both parts of the pipe
should be shortened, i.e.:
• the part of the inlet pipe on the side of the wall grid
equal to the thickness of the wall
Type A B
NL31 757 339
NL31 STYLE 805 390
NL51 1228 386
A
fig. 1
fig. 2
D E F
232 ø 230 167
230 ø 230 192
289 ø 230 183
Table 1
11
INSTRUCTIONS FOR INSTALLATION
• the part of the pipe on the side of the heater to a length
equalling the wall thickness minus 20 mm.
CAUTION: do not cut the pipe parts on the side
where the fastening clamps have been applied.
Installation of the wall duct with telescopic
inlet pipe (fig. 3)
From the outside, put the wall grid, together with the
attached half inlet pipe into the created wall opening,
keeping "Top" up when placing the wall grid. Slide the
other half of the inlet pipe through the mounting sheet
(2), making sure that the inserted fastening clamps (5)
lie on the horizontal centre line (see the marks in the
mounting sheet). They should catch on the turned-back
edge of the mounting sheet.
Attach the sealing ring (3) and the wall ring (4) to the
half inlet pipe (see ffigure for the correct order). Take
the whole and, from the inside, slide the half inlet pipe
through the created wall opening into the part of the
inlet pipe already mounted. While doing so, make sure
the the two tension members (6) stick through the fas-
tening clamps. Press the mounting sheet up to the wall.
Appply the screw-nuts onto the tension members (6) and
tighten them by hand against the fastening clamps (5).
G3/8"
(K)
D
G3/8"
(K)
K M R
3/8" 280 Ø210
3/8" 280 Ø210
3/8" 280 Ø210
2
U
38c-981
2
16
14
15
38c-981
S T U
Ø110 255 79
Ø110 255 79
Ø110 255 80
NL 31 / NL 51
Y
364
364
401