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Tommy Walsh's DIY Guide (2001)(Empire).iso
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t8c.txt
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1998-10-14
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Summary
This task gives information about how to fit an electrical
shower unit. It is recommended that you follow individual
manufacturers' instructions as well as the following steps:
1 Choosing the power output of your shower.
2 Safety features of the showers.
3 About water pressure.
4 Arranging the water supply.
5 Arranging the electrical supply.
6 Arrange the waste discharge from the shower.
7 Specific installation instructions.
Tools
Plumbing tools, electrical tools, drill
Materials
Appropriate pipe run, appropriate electrical supply,
double pole switch
Step 1 - Choosing the power output of your shower
The power rating of the shower determines the maximum water
flow rate. For a hot shower, a 7kW heater has a maximum flow
rate of approximately 2litres/3.5 pints per minute. This rate
is adequate and not wasteful, but may not be sufficient to
overcome a very cold water supply in winter. A 9.5kW unit
will give a hot shower at a much more forceful flow rate.
Step 2 - Safety features of the shower
Changes in pressure of the water are dealt with internally
by the shower unit so the temperature of the water remains
constant.
Step 3 - About water pressure
An electrical shower unit can be fed from the mains system as
long as there is adequate pressure, usually 1 bar. If the water
pressure falls below the adequate level the unit will shut down
automatically or will not function properly. Where the pressure
is low, a booster pump will be required. If in doubt consult
your water authority.
Step 4 - Arranging the water supply
Supply for your shower should come from the rising main. Use a
run of 15mm copper pipe to make the connection and include an
isolating valve and double check valve within it. Run the pipe
work from the shower before making the connection to the rising
main.
Step 5 - Arranging the electrical supply
Showers must be on there own radial circuit directly from the
consumer unit. The size of protective device required will
depend on the specific kW of the heating unit.
Step 6 - Arranging the waste discharge from the shower
If the shower is in a new area then you must plan the discharge
accordingly. There are several waste systems available.
Step 7 - Specific installation instructions
Comprehensive installation instructions are supplied with the
shower heater. First choose a location over a bath or shower
cubicle. Fit on a finished surface, if this is tiled click on
the icon below to find out more. Plan the pipe work and waste
carefully. Do the plumbing before the wiring so you can rectify
any leaks before you introduce electricity.