Nibe DRAZICE TJ 6/4 E-3,3 kW Specification sheet

OPERATING AND
INSTALLATION MANUAL
SCREW-MOUNTED ELECTRICAL HEATING
UNIT
TJ 6/4" E –3,3 kW
TJ 6/4" E –3,75 kW
TJ 6/4" E –4,5 kW
TJ 6/4" E –6 kW
Družstevní závody Dražice - strojírna s.r.o.
Dražice 69, 294 71 Benátky nad Jizerou
Phone.: [phone]
Fax: +420 / 326 370 980
E-mail: [email protected]

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CONTENTS
1 PRODUCT TECHNICAL SPECIFICATION....................................................................................................... 4
1.1 FUNCTION DESCRIPTION ................................................................................................................... 4
1.2 DESCRIPTION OF ACTIVITY................................................................................................................. 4
1.3 VOLTAGE............................................................................................................................................ 4
1.4 SIGNALLING ....................................................................................................................................... 4
1.5 ADVICE FOR CUSTOMERS.................................................................................................................. 4
1.6 DESIGN AND GENERAL HEATER DIMENSIONS................................................................................... 5
2 OPERATION AND FITTING INSTRUCTIONS................................................................................................. 7
2.1 ASSEMBLY.......................................................................................................................................... 7
2.2 ELECTRICAL INSTALLATION................................................................................................................ 8
2.2.1 BASIC INFORMATION FOR ELECTRICAL INSTALLATION............................................................. 8
2.2.2 WIRING DIAGRAM ..................................................................................................................... 8
2.2.3 APPLICATION DIAGRAM: ........................................................................................................... 9
2.2.4 WIRING DESCRIPTION................................................................................................................ 9
2.3 HEATING UNIT OPERATION............................................................................................................. 10
2.4 INSPECTION, MAINTENANCE........................................................................................................... 10
2.5 MOST COMMON FAULTS ................................................................................................................ 11
3 IMPORTANT NOTICES.............................................................................................................................. 11
3.1 INSTALLATION REGULATIONS.......................................................................................................... 12
3.1.1 OPERATIONAL STATUS............................................................................................................. 12
3.1.2 OPERATING AND FAULT CONDITIONS, LED SIGNALLING ON PCB........................................... 13
3.1.3 FAULTY EXTERNAL CONTACT................................................................................................... 14
3.2 SPARE PARTS.................................................................................................................................... 14
3.3 DISPOSAL OF PACKAGING MATERIAL AND NON-FUNCTIONING PRODUCT.................................... 14

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CAREFULLY READ THIS MANUAL BEFORE INSTALLING THE PRODUCT
ACCESSORIES!
Dear customer,
Družstevní závody Dražice - strojírna s.r.o., would like to thank you for your decision to use a product of our
brand.
The product is not intended to be controlled by
a) people (including children) with reduced physical, sensual, or mental capacities, or
b) people with insufficient knowledge and experiences unless supervised by responsible person,
or unless properly instructed by such responsible person.
The manufacturer reserves the right for engineering modification of the product.
It is recommended to use the product in indoor environment with air temperatures from +2 °C to +45 °C
and a relative humidity up to 80 %.
Product’s reliability and safety is proven by tests implemented by the Engineering Test Institute in Brno.
Made in the Czech Republic.
Meaning of pictograms used in the Manual
Important information for heater users.
Abiding by the recommendations of the manufacturer serves to ensure trouble-free operation
and the long service life of the product.
Caution!
Important notice to be observed.

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1PRODUCT TECHNICAL SPECIFICATION
1.1 FUNCTION DESCRIPTION
The screw-mounted electrical heating unit (heating unit) is designed exclusively for water heating. It is
designed as an additional heating source in water heaters connected in a system with solar collectors. It can
also be used as an additional source of heating in accumulation tanks. If the installation requirements are
obeyed, it can be used as the main source of heating by a heater, or for other purposes.
Water is heated by tubular heating element. The well includes the sensor of safety thermostat. Water
temperature is controlled by an external controller, which controls the heating. Heating can be carried out
in three power steps. In the event of a heating failure, the safety thermostat switches off the power supply
at all poles.
1.2 DESCRIPTION OF ACTIVITY
The operation is controlled by an external voltage of 230 VAC from a parent external controller connected to
terminals RS1, RS2, RS3. Heating can be carried out in three power steps. For example, for TJ 6/4" E 6 kW:
6 kW, 4 kW, 2 kW. Heating of the individual power steps is indicated by a green translucent colour
on the housing cover (Figure 2, Figure 9).
1.3 VOLTAGE
Before interfering with the wiring, it is essential to switch off the power supply!
And wait for at least one minute.
The voltage of phase L1 is the supply voltage for the PCB (printed circuit board). Unless there
is voltage L1 = the controller does not start the heating.
1.4 SIGNALLING
The PCB contains 7 LEDs (Figure 5, Figure 8)
Green colour indicating supply voltage "heating on": LED L1, LED L2, LED L3.
Green colour indicating "switching present": LED PWR
Red colour indicating controlling external "voltage present": RS1, LED RS2, LED RS3
1.5 ADVICE FOR CUSTOMERS
Prior to putting the heating element into operation, re-measuring of insulation resistance is
recommended. The insulation resistance in cold must not be below 50 MΩ. If the insulation
resistance is lower, we recommend drying the heating element.
Both the electric and water installation must follow and meet the requirements and regulations
applicable in the country of use!

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1.6 DESIGN AND GENERAL HEATER DIMENSIONS
The heating unit consists of an electrical heating element with a connecting thread G 6/4“and a cover.
(Figure 1). Underneath the wiring cover there is a printed circuit board (PCB) of the control with connection
terminals and signals and a safety thermostat. The cover can be removed by removing the cover screw
(Figure 2).
Figure 1
Figure 2
Phase switching lights
(LED L1, LED L2, LED L3)
Screw
Circuit board
Heating element
Thermal fuse
Wiring cover

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Housing lengths are within a tolerance of ± 10 mm.
L1 Screw-mounted electrical heating unit of TJ series with an extended cooling compartment
Table 1
TYPE
NUMBER OF
SWITCHED
PHASES
POWER
WIRING
HEATING TIME
FROM 10 °C TO
60 °C
(APPROX.150 L)
RECOMMENDED
CIRCUIT BREAKER
VALUE
ELECTR.
PROTECTION
TEMPERATURE
SET POINT RANGE
HOUSING
LENGTH (L1)
WEIGHT
kW
hrs
A
°C
mm
kg
TJ 6/4“ E – 3,3 kW
3
3,3
3 PE-N AC
400 V/50Hz
2,6
3 x 10
IP 44
5 - 74
325
2
2
2,2
2 PE-N AC
4
1
1,1
1 PE-N AC
8
TJ 6/4“ E – 3,75 kW
3
3,75
3 PE-N AC
400 V/50Hz
2,4
3 x 10
IP 44
5 - 74
450
2
2
2,5
2 PE-N AC
3,5
1
1,25
1 PE-N AC
7
TJ 6/4“ E – 4,5 kW
3
4,5
3 PE-N AC
400 V/50Hz
2
3 x 10
IP 44
5 - 74
500
2
2
3
2 PE-N AC
3
1
1,5
1 PE-N AC
6
TJ 6/4“ E – 6 kW
3
6
3 PE-N AC
400 V/50Hz
1,5
3 x 16
IP 44
5 - 74
520
2
2
4
2 PE-N AC
2
1
2
1 PE-N AC
4,5

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2OPERATION AND FITTING INSTRUCTIONS
2.1 ASSEMBLY
The heating unit shall be mounted in the heater's neck. The end of the thread is provided with
a rubber seal. To ensure better tightness we recommend the screw joint being additionally
sealed with cannabis, a Teflon sealing tape or a mastic sealant (be careful –choose a mastic
sealant suitable for demountable joints). Tighten the element properly. If the cable bushing
is not directed upright down, loosen the 4 screws on the plastic cover bottom. Turn the cover
(not more than by 180°) to the desired position and re-tighten the screws. Check whether
the live parts of the wiring do not touch. The sealing ring is mounted last on the metal body
The space in front of the connection fitting equal to the installation length + 50 mm must be
left free for the installation, etc.
A sealing ring is part of the heating unit package.
1) Water heater
2) Electrical heating unit TJ
3) Sealing ring
Figure 3

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2.2 ELECTRICAL INSTALLATION
2.2.1 BASIC INFORMATION FOR ELECTRICAL INSTALLATION
Run the supply cord through the bushing and connect accordingly with the scheme for the
heating unit. Run the control cable through the gland and connect according to the diagram
(Figure 4). The heating unit is connected to the 400 V (230 V)/50 Hz mains by a fixed connection
with a conductor of the appropriate cross-section and the appropriate fuse for the power rating
of the heating element.
Notice: Perform the installation in compliance with applicable standards.
2.2.2 WIRING DIAGRAM
Figure 4

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2.2.3 APPLICATION DIAGRAM:
Model design of possible control
Figure 5
2.2.4 WIRING DESCRIPTION
Terminals on PCB
1) Power supply 400 VAC
PE –earth (yellow/green wire)
N –working zero (blue wire)
L1 –phase 1. (brown wire)
L2 –phase 2. (black wire)
L3 –phase 3 (grey wire)
Conductor max. S= 4 mm²
2) Control, external 230 VAC
RS1 –control switching L1, switches on heating stage I
RS2 –control switching L2, switches on heating stage II.
RS3 –control switching L3, switches on heating stage III.
C_N –working zero
Conductor max. S = 2,5 mm²
3) Fault signalling (fuse opening), 1 contact
S1
S2
Conductor max. S = 2,5 mm²
Contact (potential-free)

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Power supply
The heater is connected to the 3x 230 V (400 V)/50 Hz power grid using a fixed moving cable in which a circuit
breaker (and possibly a current protector) is fitted. The 5 x 2.5 mm² cable must be tripped with a circuit
breaker of appropriate parameters listed in the table (Table 1).
Control power supply
Control inputs RS1, RS2, RS3 are connected to the mains 1 x 230 V/50 Hz with a cable.
Power supply to the inputs via one identical L phase.
It is recommended to trip the control voltage with a 500 mA (0.5 A) fuse.
Fault signaling (fuse blowing)
The contact of the S1/S2 terminal is rated at 5 A/250 VAC.
Switching contact (NO), potential-free.
It is recommended to trip with fuse 1A.
Instructions for connecting wires to terminals:
Wires are connected to the Wago terminals on the PCB. The tool to use is a flat head screwdriver of the
appropriate width. The wires are connected from the side (Figure 6). Use appropriate clamping force.
Figure 6
2.3 HEATING UNIT OPERATION
Water temperature control is operated (performed) automatically by an external controller which controls
the heating.
2.4 INSPECTION, MAINTENANCE
Maintenance involves decalcification of the heating element in certain time intervals selected by water
hardness at the place of use. Damage to the heating element due to calcareous sediments is not accepted
by the manufacturer as a reason for complaint.
Notice: If the heating unit is used in an accumulation heater, the wear of the anode rod of the
heater may deteriorate. We recommend checking it more frequently. Consider the instructions
of the manufacturer regarding the exchange of the anode rod.

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2.5 MOST COMMON FAULTS
FAILURE SYMPTOM
SOLUTION
The indicator light of the
unit operation does not
light up.
The safety thermostat (Thermal fuse) is not self-
reversing, it is triggered when the heater water has
cooled down to room temperature. The fuse can then
be manually triggered (Figure 7) in a voltage-free state
by pressing the button on the thermostat body.
Failure of the heating element is not
indicated, and the indicator light remains
on even when the thermostat is switched
on.
Have the heating unit repaired by an authorized
company.
Table 2
Figure 7
Do not attempt to repair the failure yourselves. Seek either expert or service help. It does not
take much for an expert to remove the defect. When making a repair appointment, report the
type and serial number you find on the performance plate of your water heater.
3IMPORTANT NOTICES
The following cases do not entitle the Customer to exercise the right from defective performance:
- damage caused by dry operation
- damage caused by lime scale deposits
- damage caused by chemical or electrochemical influences
- damage due to incorrect voltage, lightning strike, or voltage surges
Thermal fuse

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3.1 INSTALLATION REGULATIONS
-When active, both the element and the termowell have to be surrounded with a sufficient amount
of water from all sides.
-Thermo water flow must not be prevented.
-Mounting positions –horizontal or vertical from under.
-The length of the 6/4“ neck shall not exceed 70 mm. If longer, the variant with an extended cooling
circuit has to be used.
-If the length of the neck is within 100 mm, it has to be extended on the water side, or undercut in a
minimum length of 40 mm to the minimal diameter of 50 mm.
-The maximum pressure in the vessel is 10 bar.
Both the electric and water installation must follow and meet the requirements
and regulations relevant in the country of use!
3.1.1 OPERATIONAL STATUS
Figure 8

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Figure 9
3.1.2 OPERATING AND FAULT CONDITIONS, LED SIGNALLING ON PCB
Table 3
Heating level, Output
on, LED on (on cover)
Input on RS1
LED on (on cover)
Input on RS2
LED on (on cover)
Input on RS3
LED on
(on cover)
PWR
LED on
(on cove )
Contact
terminal
S1+S2 on
Heating
Operation
L1+L2+L3
YES
L1
-
-
YES
L2
-
-
YES
L3
-
-
YES
L1+L2
-
YES
L1+L3
-
YES
L2+L3
-
YES
Fault
Possible statuses, not heating.
No power
L1+L2+L3
-
NO
No power
L1
-
NO
Powered L1+L2+L3
-
NO
Overheated, opened by emergency thermostat!

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3.1.3 FAULTY EXTERNAL CONTACT
Is used to signal possible tripping of the emergency thermal fuse.
Non-potential contact (open at rest).
CAUTION!
Interrupting L1 will open the contact and possibly activate a fault.
CAUTION!
By de-energizing the power supply, the unit may not be de-energized. Make sure that the
external control voltage is switched off!
3.2 SPARE PARTS
Always state the type of the heating unit and the name of the spare part when placing an order.
- Safety thermostat
- Printed circuit board
- Wires
- Packing ring
3.3 DISPOSAL OF PACKAGING MATERIAL AND NON-
FUNCTIONING PRODUCT
A service fee for providing return and recovery of packaging material has been
paid for the packaging in which the product was delivered. The service fee was
paid pursuant to Act No 477/2001 Coll., as amended, at EKO-KOM a.s. The client
number of the company is F06020274. Take the water heater packages to a waste
disposal place determined by the town. When the operation terminates,
disassemble, and transport the discarded and unserviceable heater to a waste
recycling center (collecting yard), or contact the manufacturer.
6-4-2022