Installing a DCC decoder in a Dapol Class 22

Click on each image for a more detailed view.

Class 22 and decoder

Before installing a decoder into any loco it is advisable to check the current being drawn by the loco. This loco requires a 21-pin decoder and draws about 0.25 amps when running normally and 0.9 amps when stalled.

This is a very easy installation which uses a TCS EU621 decoder.

There are just a couple of important things to draw your attention to.

Class 22 - where to lever body

First, ignore the instructions that come with the loco and go on about removing valences one at a time. This loco has none!

Actually getting the body off is relatively easy - just use finger nails to gently lever the body away from the chassis where shown on the photo (left). Once you have levered away on one side slightly, do the the same on the other side. Then gently wiggle the body from side to side until it reaches the top of the chassis.

Class 22 inside

Be careful as you separate body from chassis as wiring for the lighting is wrapped around the decoder socket and under the blanking plug. Gently remove the wiring from under the blanking plug - this provides enough length of wire to put the body down (upside down) alongside the chassis.

Class 22 with blanking plug removed

Gently remove the blanking plug. It is quite a tight fit so, like removing the body, wiggle the blanking plug from side to side, being careful not to bend any of the pins.

Pin 1 is clearly marked next to the appropriate pin.

Class 22 with decoder fitted

Make sure you orientate the decoder properly before attempting to install it. If in doubt, check the instructions which come with the decoder. If you use the EU621 check against the photo (left).

Before replacing the body, program the CV settings as required on the programming track and test the loco on the main line or a rolling road to check that both motor and lights are working correctly.

The second important point to make is about replacing the body. Make sure you wrap the lighting wires back around the decoder socket. You then need to line up very carefully the body with fittings already on the chassis. You need to replace the body so that it is level all of the time rather than trying to fit one end first as it is a very snug fit and any angle will mean there won't be room for the body to slot back into place.


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