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4. Description of the product
4.1 General description
This appliance is a purpose designed unvented water
heater. The unit has a stainless steel inner vessel,
which ensures an excellent standard of corrosion
resistance. The outer casing is a combination of resilient
thermoplastic mouldings and pre-painetd corrosion
proofed steel. All products are insulated with CFC free
polyurethane foam to give good heat loss protection.
The appliance is supplied complete with all the
necessary safety and control devices needed to
allow connection to the cold water mains. All these
components are preset and should not be tampered
with.
4.2 Operation principle
The unvented cylinder is used to heat and store hot
water for use in domestic applications.
Depending on the model the water can be heated
directly using factory fitted Immersion heater(s) or
indirectly through a coil in the unit using an indirect heat
source.
To provide pressure to the tap or shower an unvented
water heater uses the incoming mains water pressure.
To do this the water heater is sealed and not vented.
However, when the volume of water is heated it
expands and without any room for expansion could
cause the water heater to rupture and fail. The water
heater requires no separate expansion vessel to
accommodate this expansion as it incorporates an
internal air gap.
4.3 Main components
See Fig. 3, page 9
4.4 Standard delivery
The delivery includes:
Cylinder incorporating factory fitted immersion
`
heater(s) and thermal controls and factory fitted
temperature and pressure relief valve
Instructions (inc benchmark commissioning
`
checklist & service record)
Warranty card
`
Cold water control pack
`
Pressure reducing valve
`
Isolation valve
`
Tundish
`
Drain valve
`
Nut and olive kit
`
Immersion spanner
`
2 port zone valve (indirect only)
`
Wiring centre (indirect only)
`
Check all components are supplied in the pack and
advise your supplier if any are missing.
10
4.5 Storage and Handling
If the unit is to be stored before installation it must be
placed upright on a secure, level surface and be in a
dry, frost free environment. The support surface must
be capable of supporting the packaged weight of the
unit, the packaged weights are displayed on the carton
label.
Please take care when handling a packaged cylinder.
The units are heavy and must only be moved manually
using safe working practices. The package weights of
each unit are displayed on the carton label.
Take note of the unit weights when deciding on a safe
lifting method. DO NOT use the factory fitted T&P/
Expansion Relief Valve to lift or manoeuvre the unit.
CAUTION
This unit should be kept upright if transported
by vehicle, if not it could damage the internal
heating coil.
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