11
6. Installation
6.1 General
After reading the previous sections in this booklet and
choosing a good location for the unit please install,
paying attention to the following hydraulic, electrical
and commissioning sections.
Boiler selection
`
The boiler should have a control thermostat
and non self-resetting thermal cut-out and be
compatible with unvented storage water heaters.
`
Can be a sealed system or open vented type -
maximum primary pressure 3 bar.
`
The primary flow from the boiler must be pumped.
Gravity circulation will not work due to the
special design of the primary heat exchanger. It is
recomended that an air bleed point or automatic
air vent is incorporated in the primary return
pipework close to the unvented system.
`
The boiler cannot be vented through the cylinder.
Limitations
The cylinder should not be used in association with any
of the following:
`
Solid fuel boilers or any other boiler in which the
energy input is not under effective thermostatic
control, unless additional and appropriate safety
measures are installed.
`
Ascending spray type bidets or any other class 1
back syphonage risk requiring that a type A air gap
be employed.
`
Steam heating plants unless additional and
appropriate safety devices are installed.
`
Situations where maintenance is likely to be
neglected or safety devices tampered with.
`
Water supplies that have either inadequate
pressure or where the supply may be intermittent.
`
Situations where it is not possible to safely pipe
away any discharge from the safety valves.
`
In areas where the water consistently contains a
high proportion of solids, e.g. suspended matter
that could block the strainer, unless adequate
filtration can be ensured.
`
In areas where the water supply contains chloride
levels that exceed 250mg/l.
5.3 Choice of location
The cylinder must be vertically floor mounted. Although
location is not critical, the following points should be
considered:
`
The cylinder should be sited to ensure minimum
dead leg distances, particularly to the point of
most frequent use.
`
Avoid siting where extreme cold temperatures will
be experienced. All exposed pipe work should be
insulated.
`
The discharge pipework from the safety valves
must have minimum fall of 1:200 from the unit and
terminate in a safe and visible position.
`
Access to associated controls and immersion
heaters must be available for the servicing and
maintenance of the system. Where these controls
are installed against a wall a minimum distance of
250mm must be left.
`
Ensure that the floor area for the cylinder is level
and capable of permanently supporting the weight
when full of water (see table 1 & 3, page 5 & 6 for
weights).
`
Prior to installation the unit should be stored and
transported in an area free from excessive damp or
humidity. The Unit should be stored in a frost free
environment.
WALL
Min 250mm
Min 250mm
Figure 6: Acess schematic (not to scale)
