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Description and principle of operation
EWH consists of casing, tubular electric heater, relief valve and protective cover.
The outer casing of EWH consists of steel tank heat insulated with impact-resistant plastic and two
threaded pipes for cold water inlet (with blue ring) and hot water outlet (with red ring). Inner tank is
made of stainless steel, which ensures high corrosion resistance and, therefore, long service life.
Tubular electric heater (TEH) (7), thermostat (8) and magnesium anode (9) are mounted on the
removable flange. TEH is used to heat water and thermostat provides with possibility of heating
temperature regulation up to +74° c (± 5° C).
Water temperature adjustment in the inner tank is made by thermostat control unit (10), located on the
protective cover of the water heater. The thermostat also has temperature switch – safety-protection
device against EWH overheating, which disconnects TEH from power supply when water
temperature exceeds +93° C (± 5° C). In the course of operation EWH casing can heat. Actuation of
water heater thermal protection is not a malfunction. Return of water heater to operating condition is
made by pressing thermal switch rod, located under EWH protective cover (fig. 3).
Relief valve performs functions of return valve, preventing the ingress of water from water heater into
water supply in cases of pressure drop in the latter and in cases of pressure increase in the tank when
strong heating of water, as well as function of safety valve, relieving excess pressure in the tank when
strong heating of water.
Backlight power selection key (11) is EWH operating mode indicator Figure. 1: lighted up when
heating water and turn off when water temperature reaches the set.
There is residual current device (RCD) (option) mounted on the EWH electric cord which provides
EWH disconnection from power supply when current leakage to grounded EWH elements.
Installation and connection
All installation, plumbing and electrical works must be performed by qualified
personnel.
Arrangement and installation
EWH installation shall be performed in accordance with marking on the housing and the following
table:
EWH model
Volume, l
Make
Praktik
80 – 150
vertical
Praktik Slim
30 – 50
vertical
It is recommended to install EWH as close as possible to the place of hot water using to reduce heat
loss in the pipes. Depending on the model you will require 2 or 4 anchors.
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