ELEKTROMET EJK mini User manual

OPERATION AND MAINTENANCE MANUAL
WARRANTY CARD
HEATER type EJK mini
for storage tanks covered inside with ceramic enamell
with insulated heating element
with metal head
for water heaters
~230 V
EJK mini - 1500 □
EJK mini - 2000 □
EJK mini - 3000 □

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Before installing, please read the following Operation and Maintenance Manual and the
Warranty Card
Table of contents:
1. General information ………………………………………………… 3
2. Structure and technical data ……………………………………….... 3
3. Heater installation ………………………………………………........ 5
3.1 Assembly in tank ………………………………………........…........ 5
3.2 Electrical connections …………………………............................… 6
4. Turning on and water temperature setting …………………….......... 9
5. Overheating protection …………………………….....................……10
6. Anti-freeze protection …………………………….......................….. 10
7. Operating instructions ……………………………......……………... 10
8. Warranty conditions ……………………………………………….... 13
ENCLOSURES:
DECLARATION OF CONFORMITY
WARRANTY CARD
1. Dry operation (without water) should be strictly avoided Place the plug in the socket
only after the tank has been filled with water. Otherwise heating elements may
become overheated and damaged, and therefore will require replacement.
2. The plug must be accessible after the heater is installed.
3. If the power cord is damaged, it should be replaced by the manufacturer or by a
specialized repair shop, or by a qualified person in order to avoid risks.

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1. General information
Heaters type EJK mini are designed for heating water in open and closed metal tanks,
including enamelled domestic hot water tanks in particular. In those tanks with anti-corrosion
cathodic protection system using magnesium anode or external current anode heating elements
should be partially insulated electrically from tank walls. Thanks to this, the electrochemical
potential difference between heating elements made of copper or special stainless steel and the
tank made of carbon steel is partially equalized in a tank filled with water. This way the
durability of heating elements and the life of the magnesium anode are increased significantly.
The insulation of heating elements in EJK mini heaters is done by fixing them in a casing
wholly made of plastic. Heating in a casing is placed in the metal head. Between the heating
element and the tank there is no electrical connection so that the metal of the sacrificial anode
is not deposited on the heater.
The heater EJK mini is not intended to use in storage tanks made of stainless steel.
2. Structure and technical data
Heaters type EJK mini are made of tubular heating elements with an internal resistance
wire, heater insulating bezel pieces, metal head and a casing containing single-phase 230V
power supply unit, including a temperature controller with stepless temperature adjustment and
a non-automatic temperature limiter to protect the heater from overheating. The temperature
controller knob and signal lamps are situated in the cover closing the upper part of the casing
body. The lower part of casing body ends with a metal head with a 1½” thread to screw the
heater to the tank coupling. Heaters structure scheme and their technical data are shown in fig.
1 and in table 1.
Tab. 1. Heaters technical data
Heater type
Pow
er
Supply
voltage
Dead
zone
D
Fold
length
L
Immersion
H
Threaded
Minimum
[kW]
[V]
[mm]
[mm]
[mm]
[cal]
[dm³]
EJK mini1500
1,5
~ 230
70
90
300
1 ½”
60
EJK mini2000
2,0
~ 230
70
190
300
1 ½”
80
EJK mini3000
3,0
~ 230
70
290
400
1 ½”
100

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1 - casing body
2 - cover
3 - temperature controller knob
4 - heating element
5 - temperature sensor cover
6 - power cord (1,5 m)
for 1500W –3x1.0mm² cord
for 2000W and 3000W –3x1.5mm² cord
7 - signal lamp
8 - plug for STB connection
9 - gasket
Fig. 1. Heater structure

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3. Heater Installation
3.1 Assembly in tank
A. Type of tank
he tank and its connections must be made of metal. The structure of the heater provides
a protective circuit connecting protective conductor of the power cord with a metal head. This
connection is made in a sustainable way inside the body of the heater.
B. Working position
The heater may only operate in horizontal or semi horizontal position.
During operation heating element and the sensor protection must be totally immersed in
water and free thermally forced water circulation must be ensured. The length of the coupling
for assembling the heater shall not exceed circa 70 mm so that it does not stand out from the
heating elements dead zone (unheated zone). Heater casing must not be covered nor thermally
insulated as it would disturb normal operation of the temperature controller and of the
temperature limiter installed in the casing. When assembling the heater make sure that heating
elements length fits into the tank and that they do not touch any internal parts of the tank, such
as heat exchangers or thermometric pipes.
C. Pressure tanks
The heater is adapted for installation in pressure tanks of an admissible pressure not
higher than 10 bar. All the assembly, installation and service conditions for these tanks (boilers)
must be observed. It is also absolutely obligatory to install a safety valve with the opening
pressure not higher than indicated in the tank operating parameters. Valve flow capacity should
be chosen taking into account the power of all heaters and heat exchangers which heat water in
tank, as regulated by the Office of Technical Inspection, using the technical data published by
particular safety valves manufacturers.
Safety valve opening pressure when heater type EJK mini is used must not exceed 10 bar.
When installing an electric heater in a pressure tank it must be also remembered that the
operation of these devices is subject to various kinds of technical inspection, particularly in
accordance with the Regulation of the Minister of Economy, Labour and Social Policy dated
9.07.2003. Among other things, it stipulates that:
1. 1. Electric storage water heaters for domestic water of working temperature not higher
than 100ºC and capacity not larger than 300 l as well as tanks filled with water (heat exchangers
included) of working temperature not higher than 100ºC and capacity not larger than 500 l are
subject to simplified inspection, and therefore do not need to be reported to the Office of
Technical Inspection.
2. Electric water heaters of capacity larger than 300 l as well as tanks filled with water
(heat exchangers included) of capacity larger than 500 l are subject to limited inspection and
need to be reported to the Office of Technical Inspection.

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D. Heater sealing
Flat and O-ring gaskets are supplied with the heater.
Seal the heater only with a flat gasket Ø 55 x Ø 47.5 mm x 2mm (plane faying surface on
the coupling) or with an O-ring gasket Ø 46 mm x 3.5 mm (grooved faying surface on
coupling).
3.2. Electrical connections
A. Heater power supply
Heaters are factory-fitted with power cords with a length of 1.5 m finished with a plug.
The heater should be connected by inserting this plug into a socket. Socket type
2P+Z/230V/16A with active grounding pin should be used (do not use splitters).
B. Electrical installation diagram
Electrical installation diagram is presented in the fig. 2.
1 - heating element
2 - temperature controller +
3 - resistor
4 –rectifying diode
5 - red signal diode
6 –metal head
Fig. 2. Electrical installation diagram

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4. Turning on and water temperature setting
After the power is turned on (the plug is placed in the socket), both signal lamps situated
on the casing cover, which show the passage of current through the heating
If the temperature controller knob is in its extreme position (snowflake) and the red lamp
does not light up, turn the knob until the contacts in the temperature controller close. It is
recommended to supervise the first heating of water, remembering that during heating process
the volume of water in pressure tank expands and it must be evacuated through the safety valve
or accumulated in a diaphragm expansion vessel.
The heater power is cyclically turned on and off by the temperature controller as hot
water cools down or is consumed. The temperature controller cooperates with the capillary
sensor placed in a special protective pipe, immersed in water. By turning the temperature
controller knob (tab. 3) the desired temperature in water tank can be set steplessly in the range
of 50C (turn the knob all the way to the “snowflake” symbol) to 650C (three dots). When the
set temperature is achieved, temperature controller shall automatically turn off the power
supply to heating elements and shall turn it on again when water temperature drops below the
set temperature.
5. Overheating protection
Prior to re-enabling the thermal protection it is necessary to disconnect the heater form the
power supply.
The heater is protected against overheating by a non-automatic temperature limiter, the
so-called STB, which cuts off the current flow to the heating unit in case of failure of the
temperature controller and a temperature rise over 930C. Power can be turned on again only
after the heater cools down and the button situated on the temperature limiter body is pressed.
To do so, remove the knob situated in the heater casing cover, using a small flat screwdriver.
Place the screwdriver in the gap between the knob and cover of the heater body (fig. 3). Pry up
the knob with a gentle upward movement and remove it. Using the same screwdriver, bend the
rubber gasket situated under the knob and press the red thermal protection button on the
temperature limiter body (fig. 4). The switching of protection is signalized by the click sound.
This operation shall be carried out only by a properly qualified person, who will define the
cause of the failure and remove it.

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1 - cover
2 - temperature controller knob
Fig. 3 Removal of heater knob –placing of a screwdriver in a gap.
1 - cover
3 - gasket
4 - thermal protection STB
Fig. 4 Pressing the thermal protection on the temperature limiter body.

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6. Anti-freeze protection
The temperature controller used in the heater is provided with the anti-freeze protection
feature to maintain the temperature of water in tank in the level of +50C. This feature can be
turned on by turning the temperature controller knob all the way to the snowflake sy mbol. The
heater is not turned off in this position, it is anti-freeze protection only.
7. Operating instructions
A. Heaters type EJK mini do not need to be supervised during operation. However, if the
water is hard, heating elements should be periodically cleaned of boiler scale as it blocks the
heat flow and therefore increases the current consumption and may cause damages of
heating elements.
B. The temperature of water in tank is set by the temperature controller knob. Remember that
electric energy consumption and accumulation of boiler scale increase at higher
temperatures. Temperatures of water achieved for various settings during tests at the
manufacturer's are
The heater EJK mini is not intended to use in storage tanks made of stainless steel.

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Tab.3 Water temperature for various settings of temperature control knob.
Knob position
Description
In its extreme left position the temperature controller operates as
an anti-freeze protection feature, that is, it turns the heater on
only after the temperature drops down to +5oC.
Ca.+20oC, lukewarm water, directly suitable for washing in a
washbasin, no accumulation of boiler scale.
Ca.+45oC, moderately hot water, slight accumulation of boiler
scale.
Ca.+65oC, hot water, high accumulation of boiler scale.

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8. Terms of warranty
1. Warranty period is 24 months.
2. The Guaranty period starts from the day of purchase of the product by the user entered into
the warranty card and confirmed by the proof of purchase (invoice) issued by the Seller.
3. The Warrantor ensures a proper functioning of the heater under the condition that it is
installed and used as described in the present manual.
4. Heating elements (abutment temperature controller) damaged due to excessive accumulation
of boiler scale are not covered by the warranty
5. Removal of the cover and turning on STB is not a guarantee service and shall not be a
subject to the complaint.
6. Scale removal by mechanical means is not permitted; it should be carried out using
appropriate available resources (citric acid, descaling agents, etc.)
7. During the warranty period the user is entitled to free of charge repair of damages of the
heater that occurred through the fault of the manufacturer. These damages shall be
eliminated within 14 days after they have been reported.
8. The warranty does not apply to the damages caused by the improper use, repairs and
alternations made by unauthorised persons and the device installation and maintenance that
is not in accordance with this manual.
9. In the event of failure or malfunction of the transporter the manufacturer’s service should be
notified by phone: [phone] from 7ºº am to 3ºº pm, or via electronic mail: or in the
place of purchase.
10. The method of repair shall be chosen by the manufacturer.
11. The Warranty Card, filled in, complete and free of any modifications shall be the ground for
carrying out repairs by virtue of granted warranty.
12. In the matters not regulated by the above provisions, the Civil Code shall apply
13. It is recommended to keep the warranty card during the whole period of
use of the heater.
Waste arising from electrical and electronic equipment (WEEE)
This product must not be treated as household waste.
By ensuring the proper disposal you protect the environment. In order
to obtain more detailed information regarding the recycling of this
product please contact your waste disposal service or the shop where
you have purchased this product.

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