Supplied By www.heating spares.co Tel. 0161 620 6677
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2. BOILER CHARACTERISTIC AND EQUIPMENT
2.1. CHARACTERISTICS
PROTHERM electric boilers are designed for usage in heating warm-water systems with forced water circulation.
They serve as heaters of heating water, which is then pumped and distributed through central and level heating
systems to heating bodies.
The electric boiler has a function of sequential on/off switching of power at intervals of maximum 6 kW with 10-70
seconds delay according to the boiler output, so that undesirable impulses in the mains are eliminated on the
electric boiler switch-off and switch-on. The circulation pump only works when it is necessary, thereby saving
energy and reducing mechanical wear. The pump stays in operation for 2 minutes after the electric boiler switch-off,
so that warm water remaining in the boiler body and distribution system after switch-off can be utilized.
The electric boiler is mounted into a steel case with a front panel integrated with side panels attached to the back
panel with screws. The heating water inlet and outlet are at the bottom of the boiler as well as an electrical connection.
The REJNOK series boilers are designed for mounting on a wall.
In order to achieve higher output, the electric boilers can be cascade-connected, and controlled by only one
temperature controller connected to the primary electric boiler.
Operating diagram of the electric boiler (Diagram 1)
1. a heating coil
2. a container / heat exchanger
3. insulation
4. a deaerating valve
5. the circulation pump
6. heating flow
7. heating return
8. an integrated hydroblock
9. a safety valve
10.
a pressure sensor
11.
an expansion tank
2.2. Boiler equipment
The electric boiler is equipped with a cylindrical heat
exchanger with heating elements, a hydroblock consisting of
an integrated circulation pump, a pressure sensor and a safety
valve.
The signalling and power control panel consists of an
integrated thermometer and a pressure meter, an operating
thermostat, the first, second and third output level LED diodes,
the second and third output level switches, general remote
control LED diode and LED diode indicating mains and
eventual overheating of the boiler.
The internal control and safety segment consists of an
electronic switching block with a contactor for general remote
signal control and an emergency thermostat.
There is a built-in 10l expansion tank for the compensation
of the thermal expansivity effect of heating water in the system.
TS
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Diagram 1
