Description Of The Product; General Description; Operation Principle; Main Components - Heatrae Sadia 7037042 Installation, Operation And Maintenance Manual

4. Description of the product

4.1 General description

This appliance is a purpose designed unvented
water heater. The water heater 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 coated
corrosion proofed steel sheet. 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 appliance is used to heat and store hot water for
use in domestic & commercial applications.
The water is heated directly using a factory fitted
electric heating element and thermostatically controlled
by an adjustable thermostat.
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. To allow expansion
of this heated water it is important that an expansion
vessel is used (supplied). This vessel is pressurised
and gives the heated water room to expand.

4.3 Main components

See figure 3: Main components

4.4 Standard delivery

The delivery includes:
Water heater
`
Wall mounting brackets
`
Literature pack
`
Instructions
`
Warranty card
`
Cold water control pack
`
Expansion vessel (inc bracket)
`
Tundish
`
Pressure reducing valve
`
Expansion (Pressure) relief valve
`
Check valve
`
Compression nuts
`
Copper olives
`
Please check all components are supplied in the
pack and advise your supplier if any are missing.
8
5
6 2
Figure 3: Main components
Item
1 Temperature and Pressure Relief Valve
2 Thermostat adjustment knob
3
4 Wall Mounting Bracket (Lower)
5 Neon Indicator
6
Table 4: Main components table
Description
Inlet
Outlet
1
3
4