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Tommy Walsh's DIY Guide
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Tommy Walsh's DIY Guide (2001)(Empire).iso
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t24b.txt
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1998-10-14
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Summary
Fitting a dishwasher can be a simple task. However,
it is recommended that you follow individual
manufacturers' instructions as well as the following
steps:
1 About dishwashers
2 About water pressure
3 About self-bore valves
4 About tee-connectors
5 Fitting an appliance valve
6 Fitting the waste system
Tools
Adjustable pliers x 2, heat gun, pipe cutter, wire wool,
hacksaw
Materials
Washing machine valves, pipe, pipe connectors, flux,
solder
Step 1 - About dishwashers
Dishwashers need a supply of cold water and adequate
discharge of the waste into a soil stack or gully.
They also require electricity which you should supply
as a fixed appliance.
Step 2 - About water pressure
If you are fitting a dishwasher downstairs to the main
water supply, the pressure will normally be okay.
The washing machine instructions will detail what
pressure is required. If you need to connect the
water supply to a cistern, the closer you fit it
to the cistern, the less pressure will be. If in
doubt, check with your local water authority.
Step 3 - About self-bore valves
If the location for your dishwasher has hot and
cold water pipes that run directly behind it,
you may be able to fit self-boring valves. These
can be fitted with no special plumbing tools.
Turn off the supply valve to the pipe before
you begin. As you insert the valve the integral
cutter bores a hole in the pipe and the clamp
forms a seal against the pipe with a special
washer.
Step 4 - About tee-connectors
If you are unable to use self-boring tap fittings,
you will need to connect to both supply pipes using
a tee-connector and run supply pipes to your chosen
position.
Step 5 - Fitting an appliance valve
Appliance valves are available for the hot and cold
supply pipes and will connect in various ways
depending on your needs. A tee-piece valve will
fit in much the same way as a tee-connector.
Other valves will fit to the pipework using a
compression fitting and have a thread for the
connecting hose. Use an appliance valve to isolate
the appliance in the event of a fault.
Step 6 - Fitting the waste system
The outlet hose from the dishwasher must be fitted
to an appropriate waste system. Most suppliers will
provide you with the standpipe and trap system you
need.