REMEHA 1000 Indirect, Installation Manual

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Figure 5: 3 phase wiring schematic
page 9
4. Description of the product
4.1 General description
This product 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 soft jacket. All products are insulated with CFC free polyurethane
foam to give good heat loss protection.
The unit 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 commercial applications.
The water is heated indirectly through a coil in the unit using an indirect heat source. It can also be heated using Auxiliary immersion heaters
To provide pressure to the tap or shower an unvented unit uses the incoming mains water pressure. To do this the cylinder is sealed and not
vented. However, when the volume of water is heated it expands and without any room for expansion could cause the cylinder to rupture and
fail. To allow expansion of this heated water it is important that an expansion vessel is used. This vessel is pressurised and gives the heated water
room to expand.
4.3 Main components
See Figure 6: Main components
4.4 Standard delivery
The delivery includes:
#
Cylinder
#
Literature pack
#
Instructions (inc benchmark commissioning checklist & service record)
#
Cold water control pack (see table 3)
#
Expansion vessel (see table 3)
#
Combination valve (inc pressure reducing valve, pressure relief valve and check valve)
#
Tundish