Dru Style 3, Instructions For Installation And Operation Manual

English

INSTRUCTIONS FOR INSTALLATION

11

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

• 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. 1, 3, page 57)

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). 

Fastening the mounting sheet  

(fig. 1, 3, page 57)

Caution: Level the mounting sheet, make sure that the 

inlet pipe goes down towards the outside. (1 cm to 1 m) 

and that the wall grid lies straight against the exterior 

wall.  Then, any condensation will never get into the 

heater because of the downwards flow of the pipe.

• Now tighten the screw nuts on the tension members

• Saw or cut the tension members so that they do not 

stick out from the fastening clamps (5).

• Drill the hole for the key bolt (7).

• Attach the key bolt and attach the mounting sheet using 

the bolt (8) and washer (9).

Installation to a wall of inflammable material 

(fig. 5, 7, page 58, 59)

When the appliance is installed to a wall of flammable 

material, the wall duct should be executed as follows.

• On the spot of the duct, create a square opening in the 

wall ( 



 M mm).

• In the case of compressible walls, fill up the space all 

round the opening well, so that the wall cannot be 

crushed.

• In addition, replace the bolt (8) by e.g. a wood screwed 

bolt.

• On the room side, put the heat shield (14) between the 

mounting sheet (2) and the wall.

• On the outside of the wall, using 4 screws (16), attach  

siluminplate (15).

The heat shield (14) and the silumin plate (15) are packed 

together and are available from your dealer. Assembling 

the wall duct is otherwise the same as previously 

described.

N.B. To calculate the length of the inlet and outlet pipe,  

the thickness of siluminplate (15) should be included.

Installation of the interior  

(fig.2, 4, page 57)

Take the interior and put it with the bottom edge on the 

two supports of the mounting sheet. Keep the interior 

balanced and slide the outlet pipe a little bit into the 

outlet opening of the interior for support. Now slide the 

interior against the mounting sheet, taking care that the 

turned-back edge of the mounting sheet fits into the inlet 

bush on the back side of the interior and that the bolts 

(10) stick through the clamps (11). Attach screw nuts and 

washers to the bolts (10) and tighten closely up to the 

stop. Then slide the screw spindle (12) into the clamp 

(13). Fix the screw nut and washer to the screw spindle 

(12) and tighten until the interior is standing parallel to 

the wall.

N.B. If easy accessible, e.g. on the ground floor, the 

outlet pipe can also be mounted from the outside after 

the grid interior sheet and the basket have been disas-

sembled.

STYLE 4 and 5: 

After fitting heat-exchanger fix thermostat phial in clip 

provided at rear of backplat (R.h.S.).

STYLE