Manual Defort DWP-2000 (page 9 of 88) (All languages)

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2.3. Preheating of the sleeve welding unit

As soon as the connecting lead is connected to the

mains, the welding unit begins to heat up. The green

power-on indicator lamp (6) and the red temperature in-

dicator lamp (7) light up. The unit requires about 10 min.

to heat up. Once the required temperature is reached,

the built-in thermostat cuts off the power supply to the

heating element. The red temperature control lamp turns

off. Whenever the red temperature control lamp is lit, the

no welding should be carried out.

2.4. Selecting the correct welding temperature

The welder heating element is preadjusted to the aver-

age welding temperature for PP pipes (260°C). Depend-

ing on the pipe material and gauge of the pipe walls,

it may be necessary to adjust this temperature. In this

case, observe the manufacturer’s information on the

pipes or mouldings without fail. In addition, the tempera-

ture of the welding tools (spigot and socket) should be

checked with an electric surface thermometer. If neces-

sary, the temperature can be adjusted by turning the

temperature adjusting screw (8). In this case, it should

be remembered that the heating element must not be

used until 10 minutes after the preset temperature has

been reached.

3. OPERATION

3.1. Description of process

In welding with the sleeve welder, the pipe and sleeve

are welded together overlapping. The end of the pipe

and moulded sleeve are heated to welding tempera-

ture by means of the welding tool (spigot and socket),

then welded together. The end of the pipe and ﬁ tting are

matched to the welding spigot and socket respectively

in such a way that a build-up of pressure takes place in

the joint when the two components are mated (Fig. 3).

3.2. Preparations for welding

Take care to observe the information issued by the man-

ufacturer of the pipes or mouldings. The end of the pipe

must be cut off square and ﬂ at, either with a pipe cutter

or pipe shears. In addition, the end of the pipe should be

chamfered to facilitate insertion into the socket. This pro-

cess should be performed with the pipe chamfering unit.

Immediately before welding, the end of the pipe and in-

terior of the sleeve and, if necessary, the heating spigot

and socket should be cleaned with non-adherent paper

or a non-fraying cloth and spirit or industrial alcohol. In

particular, no remnants of plastic must be left adhering to

the coating on the heating spigot or socket. When clean-

ing the welding tools, take care to ensure without fail

that their anti-adhesive coating is not damaged by tools.

The welding surfaces must not be touched again before

welding takes place.

3.3. Welding process stages

3.3.1. Heating-up

For the heating-up process, the pipe and moulding are

pushed axially onto the welding tools in a continuous

movement until they reach the stop or the marking on

the tools. During the heating process, heat penetrates

into the joint faces and brings them up to welding tem-

perature.

3.3.2. Changeover and joining

After the heating process, the pipe and moulding are

pulled away from the welding tools in a series of jerks and

pushed together, without twisting, as far as they will go.

3.3.3. Setting

Connected sections must be ﬁ xed (be kept together)

within a short time.

4. MAINTENANCE

WARNING

Before any repair work, pull the mains plug! This work

may only be performed by qualiﬁ ed personnel.

4.1. Maintenance

Units are entirely maintenance-free.

4.2. lnspection/repairs

The anti-adhesive coating on the heating element must

be cleaned with nonadherent paper or a non-fraying

cloth and spirit or industrial alcohol before each welding

process. Any remnants of plastic adhering to the heating

element must be cleaned off in the same way. In this pro-

cess, take care to ensure that the anti-adhesive coating

on the heating element is not damaged by tools.

5. ACTION IN CASE OF TROUBLE

5.1. Trouble: Sleeve welding unit does not

heat.

Cause: ● Sleeve welding unit is not plugged in.

● Mains lead is defective.

● Mains socket is defective.

● Unit is defective.

5.2. Trouble: Plastic remnants stick onto the

heating tools.

Cause: ● Heating tools are dirty (see 4.2.).

● Anti-adhesive coating is damaged.

6. DISPOSAL

The heating element muff welding equipment may not

be thrown into the domestic waste after use. It must be

disposed of according to the legal regulations.

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Defort DWP-2000 Manual

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