bonus kde-9 Assembly instructions

D KDE-9
D E-12
D KDE-15
D KDE-18
D KDE-21
D E-24 Electric Instantaneous
D KDE-27 Water Heater

Please, read and follow the installation and operating instructions carefully, to ensure the long life and reli-
able operation of this appliance.
The manufacturer may make minor changes in the appliance if necessary. They will not be exposed in the
operating instruction, so long as the main features of the heater remain the same.
KOSPEL S.A. 75-136 KOSZALIN UL.OLCHOWA 1

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ENG-020B/p.360
One must not install this appli-
ance in a place exposed to the
danger of frost or explosion.
KDE Bonus water heater is designed to heat water instantly at such places as home, a workshop, a restaurant,
a laboratory etc. It is a multi-point heater – it can supply hot water to a number of taps, e.g. in a sink, a shower
or a bath.
The temperature of water is set by the use of the knob on the front casing. On turning on the hot water tap,
the heater is switched on, which in effect provides heated water in accordance with the following technical
specifications.
The water heater KDE Bonus can heat up pre-heated water (e.g. co-operation with a domestic hot water cylinder
in a solar system) The temperature of the water on the inlet cannot exceed 70°C.
Description
Technical data KDE Bonus water heater 9 12 15 18 21 24 27
Rated power kW 9 12 15 18 21 24 27
Rated voltage 400V 3~
Rated current A 3 x 13,0 3 x 17,3 3 x 21,7 3 x 26,0 3 x 30,3 3 x 34,6 3 x 39,0
Supply water pressure MPa 0,1 ÷ 0,6
Minimal operating point l/min 2,5
Temp. range set by the knob °C 30 ÷ 60
Efficiency (at ∆t = 30°C) l/min 4,3 5,8 7,2 8,7 10,1 11,6 13,0
Overall dimentions mm 440 x 245 x 120
Weight kg ~5,1
Fuse rated current A 16 20 25 32 40 50
Min. connecting wires section mm24 x 1,5 4 x 2,5 4 x 4 4 x 6
Max. connecting wires section mm24 x 16
The maximum allowed network impedance Ω0,43 0,37 0,30
Water inlet and outlet section G 1/2"

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Installation and initial start-up
of the appliance should be car-
ried out by a professional.
Fig.2 Waterconnection.
Cut off power supply before any
installation work.
Recommendations
- if there is a non-return valve installed on a supply pipe, there is also an obligation to install a safety valve between
a heater and a non-return valve,
- inlet and outlet pipes should not be made of plastic,
- flow regulating valve should be installed before an each water outlet (fig.2) for the greater comfort of use,
- for economic reasons the heater should be installed in the vicinity of the most frequently used tap,
- Install an extra valve and a filter on the inlet pipe.
- outlet water temperature can not exceed 700C.
Fig.1 Electricconnection
 F - tri-polarcircuitbreaker
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Installation
1
Electric installation should be
equipped with safety (power
- differential) circuit breaker and
other devices which will ensure
disconnecting the heater from
the source of power (intervals
between all their poles should
not be less than 3 mm).
Assembly
1. Bring to the place where the heater is to be situated, three-phase
installation, in accordance with proper standards.
2. Bring water pipes to the marked places, keeping in mind that the cold
water inlet is on the right-hand side (G1/2”), the hot water outlet is on
the left hand side (G1/2”). Figure 2 shows where the heater should
be incorporated in the water system.
3. Remove the case (fig.3); undo the fixing screw [15]; take the cover
out of bottom catches [16].
4. Fix the heater on the fixing hooks after inserting the supply wire through
the hole [5a] or through the hole with removed plug [5], (fig.8).
5. Connect electric supply wires according fig.1. Connect wires to
electric terminal XP or after dismantling electric terminal with wires,
directly to temperature limiter [3].
6. Remove rubber plugs from cold and hot water fittings.
7. Connect the heater to the water system with the fittings [17] and [18]
(fig.4).
8. Flood the heater by letting cold water in (allow mains pressure gets
to the appliance) and check connection for leaks.
9. Make sure that the WT3 safety temperature limiter (fig.5) is at a
working position (the knob should be pushed in).
10. Fix the case: check the reciprocal set-up of knob and coupling on
steering board, set the knob [21] in off position, then set the coupling
fitting [22] to upright position, pointing the inside part down. Place
the case [8] into two bottom catches [16], screw up the case with
fixing screw [15].
11. Make sure that there is no access to live parts through the holes at
the back plate.

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ENG-020B/p.360
Fig.3 Disassemblyofcover
 [8] - case
 [15] - fixingscrew
 [16] - catches
4
5
Fig.5 Safetytemperaturelimiter
WT3
 a) toswitchiton
 b) limiter“on”
a) b)
3
Fig.4 View
 [8] - case
 [15] - fixingscrew
 [16] - catches
 [17] - inletfittings–coldwater
 [18] - outletfittings–hotwater
 [21] - knob
 [22] - couplingfitting

6
1. Cut off electric supply.
2. Turn the hot water tap on for the period of venting the installation (about 15-30 seconds).
3. Switch power supply on.
The recommended maintenance
needs to be done each time after
a decay of water.
If you do not vent the water
installation, the heater can be
damaged.
Venting
Fig.6 KDE Bonus work indica-
tors
 [10] - powersupply(green)
 [12] - heatingon(red)
 [21] - knob
6
Operating Water heater KDE Bonus
The heater switches on automatically straight after reaching the flow rate
over 2,5 l/min. The temperature control system selects an appropriate heat-
ing power depending on the rate of flow, temperature setting (set with the
use of a knob on the front case) and the temperature of water in the mains.
There are two indicators on the case:
- green - power supply “on”,
- red - heating “on”.
Other modes are shown through a combination of flickerings of the red
and green indicators
Number of impulses
(red indicator)
the ”green” indicator flickering with constant frequency
description
1 the water flow is too high for the temperature setting
2
the water heater was switched off by a master appliance (This
flickering will occur only when the flow exceeds the minimal
operating point.)
Number of impulses
(green indicator)
the ”red” indicator flickering with constant frequency
description
3
the inlet temperature sensor failure (This flickering will occur only
when the flow is lower than the minimal operating point)

7
ENG-020B/p.360
It is recommended to clean the
filter after water installation
maintenance, or if there are
intensive impurities in water,
or after an each year of opera-
tion.
Fig.7 Filtercleaning
 [6] - inlet with water temperature
sensor
 [14] - filter
 [17] - inletfitting–coldwater
 [20] - gasket
7
Maintenance In order to ensure long and smooth running of the heater, regular clean-
ing of the filter [14] is essential, which should be done by the user (this is
not covered by the guarantee). In order to clean the filter, follow the steps
(fig.12):
1. Shut off power and cold water supplies.
2. Remove the case [8] (fig.4): undo the fixing screw [15], take the case off
3. Undo the inlet fitting [17] – on the cold water side (left).
4. Take the filter [14] off the inlet fitting.
5. Remove impurities from the filter [14].
6. Fix the filter [14] with gasket [20] and do up the fittings.
7. Open the cut-off valve on a cold water supply pipe – check connections for
leaks.
8. Fix the case (fig.4): set the knob and coupling in correct position, put the
case back on the bottom catches [16] and do up the fixing screw to the case
[15].
9. Vent the water installation according to directions in Venting section.

8
The water heater is equipped with
a safety device (WT3) [3], which pro-
tects it from damage or failure.
Safety temperature limiter goes off
(shuts off power supply) when the
temperature in the heating box [1]
goes over 100°C. Once the safety
temperature limiter has shut down,
the operation of the appliance is
not possible. The safety temperature
limiter does not work as an electric
protection of the heater.
The ZIO PCB board features SLAVE
and MASTER appliance functions.
Use it when the power mains in your
house are not sufficient to operate
Bonus heater and another high power
appliance at the same time:
BLOK - SLAVE APPLIANCE entry,
use this entry to block heating of an-
other high power appliance - in case
you use the BLOK entry in conjunc-
tion with EKCO electric boiler, con-
nect the other end of the connecting
wire to NA entry on the EKCO boiler.
When Bonus starts heating, the heat-
ing of the boiler shuts down.
NA - MASTER APPLIANCE entry
(very rarely used, as it does not allow
to take a hot water shower) - if you
connect another high power appli-
ance to this entry, the heating of your
Bonus heater is blocked when the
MASTER APPLIANCE starts to work.
Fig.8 Innerconstruction
 [1] - heatingbox
 [2] - flowsensor
 [3] - WT3safetytemperaturelim-
iter
 [4] - protectionwireterminal
 [5]- plugged hole for electric
wires
 [5a] - holeforelectricwires
 [6] - inlet with a cold water tem-
peraturesensor
 [7] - backcasing
 [15] - fixingscrew
 [16] - catches
 [17] - inletpipe–coldwater
 [18] - outletpipe–hotwater
 A1 - controlboard
 Tin - inlet water temperature sen-
sorconnection
 Tout - outletwatertemperaturesen-
sorconnection
 Q - flowsensorconnection
 NA - masterapplianceentry
 BLOK - slaveapplianceentry
 XG - heatingboxterminal[1]
 XP - electricterminal
Any interference inside the
safety temperature limiter may
cause an irreversible damage to
the water heater.
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Construction

9
ENG-020B/p.360
Fig.9 Electricinstallation
 E1 - heatingbox[1]
 BV - differentialpressureswitch[2]
 F1 - WT3safety temperaturelim-
iter[3]
 XG - heatingboxterminal
 A1 - controlboard
 A2 - steeringboard
 Tin - inlet water temperature sen-
sorconnection
 NA - masterapplianceentry
 BLOK - slaveapplianceentry
Repairing the above is not covered by the guarantee.
If the heater breaks down (and it is caused by none of the above reasons) you need to contact an authorised
service to have it repaired.
- there is a failure of power supplies,- the heating is weak or it does not heat at all
- the plug is not properly connected to the socket, lack of 3 phases
- there is a failure of power supplies,
- the indicators on the case are off
Cut off power supplies before
taking the case off.
If the following signals of faulty work are noticed, check if:
- the rate of flow is not sufficient - the filter covered with impurities,
- valves on mains incorrectly opened.
Faults
9
contact open (NA)-
lockout of the
heating circuit
Temperature
knob
green
red

10
Water heater KDE Bonus 1 piece
Gaskets 2 pieces
Fixing hooks 2 sets
Templet 1 piece
Installation and operating instruction 1 piece
Set contents
This appliance is not intended
for use by persons (including
children) with reduced physical,
sensory or mental capabilities or
lack of experience and knowl-
edge, unless they have been
given supervision or instruction
concerning use of the appliance
by a person responsible for their
safety.
Children should be supervised
to ensure that they do not play
with the appliance.