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- Water may drip from the discharge pipe of the
pressure-relief device and this pipe must be left
open to the atmosphere; (see page 18 for more
details)
-the pressure-relief device is to be operated
regularly to remove lime deposits and to verify that
it is not blocked; (see page 25 for more details)
- How hot water can be drained. (see page 25 for
more details)
- The type or characteristics of the pressure-relief
device and how to connect it; (see Fig. 3 page 9)
- A discharge pipe connected to the pressure-
relief device is to be installed in a continuously
downward direction and in frost free environment;
(see Fig. 3, page 9 for details)
Details on how to set the temperature controls for
both immersion heaters and boiler controls can be
found in section 6. Installation, page 20.
2.1 General safety warning
WARNING
Only competent persons
`
received
permitted to work on the appliance and
the installation.
Where the inlet supply to the Pressure
`
Reducing Valve is routed through
a heated space and is fitted with a
check valve or other fitting that would
prevent backflow, high pressures can
be experienced in the inlet pipe due to
warming that can cause damage to the
PRV or other fittings on the inlet supply.
In these circumstances, the installation
of a means to accommodate expansion
and thus limit the pressure rise in the
inlet pipe is recommended
Do not tamper with any of the safety
`
valves or controls supplied with the
cylinder.
Before any work, switch off the mains
`
supply to the appliance.
Do not switch on if there is a possibility
`
that the water in the cylinder is frozen.
The HWA Charter Statement requires that all members adhere to the following:
`
To supply fit for purpose products clearly and honestly described.
`
To supply products that meet, or exceed appropriate standards and building and water regulations.
`
To provide pre and post sales technical support.
`
To provide clear and concise warranty details to Customers.
`
4
2. Safety
adequate
training
DANGER
This cylinder is unvented and as such
becomes pressurised when in operation. The
combination of pressurisation and hot water
could lead to serious physical injury if the safety
instructions in this manual are not adhered to.
WARNING
When handling the unit, take appropriate
precautions for the weight of the unit.
Weights can be found in section 3 Technical
specifications, Tables 1&2, pages 5&6.
CAUTION
Annual maintenance is recommended by a
competent person.
CAUTION
having
Do not operate immersion heaters until the
are
cylinder has been filled with water.
WARNING TO USER
If
water
discharges
`
temperature/pressure
on the cylinder shut down the boiler/
immersion heaters. Do not turn off any
water supply. Contact a competent
Installer for unvented water heaters to
check the system.
Do not remove or adjust any component
`
or part of this unvented water heater ;
contact installer
DO NOT bypass the thermal cut-out(s)
`
in any circumstances.
from
the
relief
valve
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