6 DEX & DBX Installation, Maintenance and User Instructions - April 2011
Installation
Requirements
• These instructions must be read and fully understood before commencing
the installation. If in doubt, or in need of further guidance please ring Zip on
0845 602 4533.
• Zip InLine water heaters must be installed by a competent person familiar
with electric instantaneous water heaters.
• Installations must comply fully with UK Water Regulations and any Local
Authority requirements.
• The electrical installation including earthing and cross bonding should
comply with current IEE regulations and any Local Authority requirements.
• Zip InLine water heaters must be installed according to the specification on
the rating plate and the technical specifications.
• The appliance must be permanently connected to the electrical supply through
an isolation switch having a contact separation of at least 3mm on all poles.
• To protect the appliance, a circuit breaker must be fitted with a rating
suitable for the nominal current of the appliance.
• The cross sectional area of the connection cable must be in accordance
with the power rating of the appliance and the specific requirements of the
installation site up to a maximum of cable size of 10mm
2
.
• Take care to protect the wiring from damage during installation and ensure
that the wiring is not directly accessible after installation.
• Check that the power supply is switched off prior to electrical connection.
• This appliance must be earthed.
Installation site
• The installation site must be free from frost at all times.
• The appliance complies with protection type IP25 and may therefore be
installed in protection zone 1.
• In order to minimise thermal losses, the distance between the appliance
and the outlet fitting should be as short as possible. Recommended
maximum distance 2 metres.
• For maintenance work a shut off valve should be installed in the water
supply line to the heater.
• Hot and cold water connecting pipes should be WRAS approved and of
copper or steel construction. Plastic pipes may only be used if conforming
to DIN 16893 Series 2. The hot water pipes must be thermally insulated.
• The specific resistance of the supply water must be at least 1,100 Ωcm at
15°C for type DEX and at least 1,300 Ωcm at 15°C for type DBX. The
specific resistance can be checked with the local water supply company.
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