ATTACK KZT, KST, KT, KT Small, KZT Solar Plus Instructions For Use Manual

W W W . A T T A C K . S K

GAS CONDENSING BOILER

ATTACK

KZT, KST, KT, KT Small, KZT Solar Plus

INSTRUCTIONS FOR USE

2

1 Installation...........................................................................................................................

Introduction..............................................................................................................................

Control panel KST Plus, KT Plus, KT small Plus.....................................................................

Start and stop and indication during operation KST Plus, KT Plus, KT small Plus.....................

Regulation of boilers KST Plus, KT Plus, KT small Plus..........................................................

Control panel KZT Plus...........................................................................................................

Start and stop and indication during operation KZT Plus...........................................................

Regulation of boiler KZT Plus..................................................................................................

Equithermic regulation of boilers.............................................................................................

Compensation curve and transfer of curves...............................................................................

Regulation of hydraulic pressure, connection of external tank..................................................

2 Installation...........................................................................................................................

General instructions.................................................................................................................

Place of installation..................................................................................................................

Hydraulic connections..............................................................................................................

Gas connection, anti-freeze system...........................................................................................

Electrical coonections and external sensor................................................................................

Placing of external probe and access to el. terminal...................................................................

Flue gas outlets.........................................................................................................................

Accessories, Connection to outlet of condensed water..............................................................

3 Operation and maintenance................................................................................................

Regulations..............................................................................................................................

Combustion analysis and setting of CO2...................................................................................

Start-up....................................................................................................................................

Maintenance.............................................................................................................................

Table - list of errors...................................................................................................................

4 Characteristics and technical data......................................................................................

Dimensions and connections....................................................................................................

Main boiler parts.......................................................................................................................

Hydraulic circuit of boilers.......................................................................................................

Table with technical data...........................................................................................................

Electrical schemes and diagram of pressure losses....................................................................

Accessories of flue gas outlet and table of resistance.................................................................

Manual content:

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9
10

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14-15
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22-23
24-26
27-29
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31-32
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3

1. Installation

Introduction

Dear customer,
thank you for choosing the ATTACK trademark, the wall hung condensing boilers ATTACK with
modern design, equipped with modern technology, with increased reliability and construction quality.
Read this user manual properly, whereas it contents important information concerning safety at
installation, usage and maintenance of the appliance.

The ATTACK Plus boilers are intended for central heating and D.H.W. warming (with built-in 25-litres
stainless tank, instantaneous heating or external additional tank) with mixing and condensation at high
output level at operation and very low emissions. They use natural gas or propane, equipped and
controlled with modern micoprocessor control system.
Boiler body consists from multi-plate exchanger and mixing ceramic burner, equipped with electronic
ignition and ionisation flame control, venilator with modulation of rotations and modulation gas valve.

Control panel of boilers KT Plus, KT small Plus, KST Plus

Pic.1

Control panel
Description

1 = Button to decrease set temperature of D.H.W.
2 = Button to increase set temperature of D.H.W.
3 = Button to decrease set temperature of water in central heating system
4 = Button to increase set temperature of water in central heating system
5 = Display
6 = Button to recover original setting - regime option Summer/Winter
7 = Button to switch regime Economy/Comfort - Start/Stop of appliance
8 = Symbol of D.H.W.
9 = Indication of D.H.W. production
10 = Indication of regime Summer
11 = Multifunctional indication (flickers during protection function of exchanger)
12 = Indication of regime Eco (Economy)
13 = Indication of heating function
14 = Symbol of heating in heating appliance
15 = Indication of operating burner and actual output

( flickers during function of Flame protection)

7

16

14 10

4

12 5 9

2

3

13 11 15 8

1

6

4

Indication during operation of KT Plus, KT small Plus, KST Plus

Heating

Requirement for heating (generated from room thermostat or Open therm regulator) is indicated by
flickering of LED diodes at radiator symbol (see page 13 - pic.1). Display (see page 11 - pic.1)
projects actual temperature at the inlet into heating appliance and during waiting time for heating, the
„d2“ text is displayed.

Domestic hot water

Requirement for D.H.W. (activated by taking of D.H.W. ) is signalized by flickering of LED diodes by
symbol of water tap (see page 8 - pic.1).
Display projects actual temperature at the D.H.W. outlet and during the waiting time for D.H.W., there
is a text „d1“.

Disconnection of water heater KT small Plus, KT Plus (economy)

Water warming - i.e. temperature keeping in the water heater can be turned off. In case that you turn
this function off, no D.H.W. will be produced.
User can turn the heater off (ECO regime) by pressing ECO/Comfort button (see page 7 - pic.1). In
the ECO regime, appropriate yellow control light is turned on (see page 12 - pic.1) To reactivate the
COMFORT regime, press the button ECO/COMFORT (poz. 7- obr.1 ) again.

Comfort of water heating KST Plus

Requirement for Comfort regime (comeback to original internal boiler temperature) is signalized by
flickering of LED diodes by symbol of water tap (see page 9-pic.1). Water in exchanger is
permanently warmed to temperature of 45°C. Display (see page 11-pic.1) shows actual temperature of
water in the boiler.

Start and stop of boilers KT Plus, KT small Plus, KST Plus

Boiler start

Connect appliance into electricity mains. The „FH“ is displayed within next 120 seconds, which
signalizes deareation cycle of the heating appliance. Also the version of the card software is displayed
within first 5 seconds. Open the gas valve installed on connection in front of the boiler. After
expiration of the FH text is boiler prepared for automatic operation after every usage of the DHW or
in case of requirement of the room thermostat.

Boiler stop

Hold button (see 7 - Pic.1 ) for 5 seconds.
The control electronics remains connected to the electricity mains after the boiler is shut down.
Operation of DHW warming and heating is turned off. To turn the boiler on again, hold the button for
5 seconds (see 7 - Pic.1). Boiler will be immediately ready for operation by every DHW usage or by
activation per the room thermostat. After interruption of the electrical or gas connection of device is
the antifreeze system inactive. During long-time interruption of operation, to avoid of damages caused
by frost, it is recommended to release all water from the boiler, DHW and water from supply system,
or to release only DHW and fill the supply system with antifreeze mixture that conforms to conditions
given in this manual.

5

Regulation of the boilers KT Plus, KT small Plus, KST Plus

Switching to Summer/Winter

Hold the button for 2 seconds (see 6 - Pic.1).
The Summer sign appears on display (see 10 - Pic.1). Boiler will make only the DHW The antifreeze
system remains active. To cancel the Summer mode, hold the button for 2 seconds again (see 6 ­Pic.1).

Regulation of the heating water temperature

It is possible to set the temperature from the minimum of 20°C up to the maximum of 90°C by the
buttons of heating (see 3 and 4 - Pic.1).

Regulation of the DHW temperature

It is possible to set the temperature from the minimum of 10°C up to the maximum of 65°C by the
buttons of DHW (see 1 and 2 - Pic.1).

Setting of the environment temperature (with additional room thermostat)

Set the required temperature in premises by the room thermostat. If the room thermostat is not
connected, boiler will keep temperature in supply system at value that was set at the inlet into the
supply system.

Setting of the environment temperature ( additional OpenTherm regulator)

Set the required temperature in premises by the regulator. Boiler will treat water in OpenTherm
device adequately to the required temperature of environment. Farther in this manual you will find
instructions for operation with remote control.

6

Control panel of the KZT Plus boilers

Pic.2

Control panel
Description

1 = Button to decrease adjusted DHW
2 = Button to increase adjusted DHW
3 = Button to decrease adjusted temperature of water in the central heating system
4 = Button to increase adjusted temperature of water in the central heating system
5 = Display
6 = Button for switching to Summer/Winter
7 = Button for switching to Economy/Comfort
8 = Button of reset / fill-in of device
9 = On / Off button of device
10 = Button of the „Controlled temperature“ menu
11 = Indication of achieving the required DHW temperature
12 = Sign of DHW
13 = Indication of DHW production
14 = Setting/ temperature at the DHW outlet (flickers during the „Heat exchanger protection“ operation )
15 = Indication of Eco (Economy) mode or Comfort mode
16 = Temperature of the external sensor (with additional external probe)
17 = Appears, when the external probe or the remote control is connected (optional)
18 = Temperature of environment (per additional remote control)
19 = Indication of burner operation and actual output (flickers during function „Flame protection“)
20 = Indication of operation against frost
21 = Indication of pressure in the heating device
22 = Error indication
23 = Setting / temperature at the heating device inlet (flickers during operation „Exchanger protection“)
24 = Sign of heating
25 = Indication of heating operation
26 = Indication of achieving temperature at the heating device inlet
27 = Indication of the Summer mode

7

Start and stop of the KZT Plus

Boiler without electrical connection

Boiler is not connected to the electricity mains

When the electrical or gas connection is interrupted, the antifreeze system does not work. During
long-time interruption of operation, to avoid of damages caused by frost, it is recommended to release
all water from the boiler, DHW and water from supply system, or to release only DHW and fill the
supply system with antifreeze mixture.

Boiler start

Connect boiler to electricity mains.
The „FH“ letters will be displayed within the following 120 seconds, which means, that the air is
being released form the heating device. During the first 5 seconds is displayed also the card software
version. Open the gas valve installed on the connection with boiler.
The „FH“ text expires, the boiler is prepared for automatic operation everytime by DHW consumption
or by requirement from the room thermostat.

Boiler stop

Hold the button for 1 second (see 9 - Pic.2). When the boiler is shut down, the control electronics
remains connected to electricity. Operation of water warming and heating is turned off. The antifreeze
system remains active. To start the boiler again, hold the button for 1 second again (see 9 - Pic.2).
Boiler will be immediately ready for operation by every DHW consumption or by activation through
the room thermostat.

Indication during heating operation of the KZT Plus

Requirement for heating (activated by room thermostat or remote control) is indicated by flickering of
the warm air over space heater sign (see 24 and 25 - Pic.2).
Display (See 23 - Pic.2) shows actual temperature at the heating device inlet and the „d2“ text during
the period of waiting for heating.
Grades of heating (see 26 - Pic.2) light on sequentially, according to achieving of the value set by
thermal probe.

Domestic hot water

Requirement for water heating in the boiler is indicated by flickering of the warm water sign - marked
as water tap (see 12 and 13 - Pic.2). Display (see 14 - Pic.2) shows actual temperature at the DHW
outlet and the „d1“ during waiting for DHW. Grades of the DHW (see 11 - Pic.2) light on
sequentially, according to achieving of the temperature set by the heating device sensor.

Shutdown of the water heater (economy)

Water heating, i.e. keeping water temperature in the storage tank can be shut down. When this
function is turned off, no DHW is produced. When the DHW warming is turned on (original setting),
text „COMFORT“ is diplayed (see15-Pic.2). When it is turned off, text ECO is displayed (“See7­Pic.2"). For activation of the COMFORT mode, press the button again (See 7 -Pic.2).

8

Regulation of the KZT Plus boiler

Switching Summer/Winter

Hold the button for 1 second (see 6 - Pic.2).
The Summer sign appears on display (see 10 - Pic.1). Boiler will make only DHW. The antifreeze
system remains active. To cancel the Summer mode, hold the button for 1 second again (see 6 - Pic.2).

Regulation of the heating water temperature

It is possible to set the temperature from the minimum of 20°C up to the maximum of 90°C by the
buttons of heating (see 3 and 4 - Pic.2).

Regulation of the DHW temperature

It is possible to set the temperature from the minimum of 10°C up to the maximum of 65°C by the
buttons of DHW (see 1 and 2 - Pic.2).

Setting of the environment temperature (with additional room thermostat)

Set the required temperature in premises by the room thermostat. If the room thermostat is not
connected, boiler will keep temperature in supply system at value that was set at the inlet into the
supply system.

Environment temperature setting ( additional time remote control)

Set the required temperature in premises by the . Boiler will treat water in device time remote control
adequately to the required temperature of environment. Farther in this manual you will find instructions
for operation with time remote control.

Equithermic regulation of the KZT Plus, KST Plus, KT Plus, KT small Plus boilers

After installation of external probe (additional), the external temperature measured by the external
probe is displayed on the screen of the control panel (See 5 - Pics.1 and 2).
Boiler regulation system works with the „Controlled temperature“. In this mode is temperature of the
heating device regulated according to the external climatic conditions to ensure higher comfort and
energy savings during the whole year. Moreover, after increasing of the external temperature is the
temperature at the boiler outlet decreased according to the concrete „ compensation curve“. By
regulation of the equithermic regulation of temperature, the temperature set by the buttons of heating
(See 3 and 4 - Pics.1 and 2) represents maximum temperature at the inlet into the heating device.
It is recommended to set maximum temperature to enable system operation within the full interval.
Boiler must be set by specialist during the installation. Necessary adjustment for higher comfort can be
done by user.

Compensation curve and shift of curves of the condensing boilers Plus

Press button once to display actual compensation curve (See 6 - Pic.1 KST, KT and See 10 - Pic2 KZT).
It is possible to change it per DHW buttons (See 1 and 2 - Pic.1 and 2). Adjust the required curve from 1
to 10, adequately to the characteristics. By adjusting curve to 0 is the regulation of the controlled
temperature cancelled.

Compensation curve of the Plus condensing boilers

Access to the paralel curves shifting is enabled through heating buttons (See 3 and 4 - Pics. 1 and 2).
Flickering text (OF) is displayed. It is possible to change it through DHW buttons. (See 1 and 2 - Pics. 1
and 2).

Parallel shift of the curves of the condensing boilers Plus

Repeated pressing of the button (See 6 - Pic.1 KST, KT ) and (See 10- Pic.2 KZT ) enables to exit
mode of the parallel curve regulation. If the environment temperature is lower than required
temperature, it recommended to set more abrupt curve and vice-versa. Decrease or increase for 1 unit
and check the result in the room.

9

Compensation curve and curve shifting

By holding the ,,reset" button (See6 - Pic.1 KST, KT) or the ,,mode" button(See 10 - Pic.2 KZT ) for 5
seconds opens the menu of the „Controlled temperature“, the flickering „CU“ is dipslayed. Adjust the
required curve by the DHW buttons (marked as 1 and 2, pics. 1 and 2) from 1 to 10, adequately to the
characteristics. Regulation of the controlled temperature is cancelled by adjusting curve to 0.

Compensation curve

Option of the parallel curve shift, the flickering „Of“is displayed by pressing the heating buttons (See 3
and 4 - Pics.1 and 2). Set the parallel curve shift adequately to the characteristic by the DHW buttons
(See 1 and 2 - Pics. 1 and 2).

Compensation curves

Parallel curve shift

Repeated pressing of the button „Reset“ (See 6 - Pic.1 KST, KT ) and „Mode“(See 10- Pic.2 KZT ) for
5 seconds enables to exit mode of the parallel curve regulation. If the environment temperature is lower
than required temperature, it recommended to set more abrupt curve and vice-versa. Decrease or increase
for 1 unit and check the result in the room.

Regulation with time remote control

If the time remote control (additional equipment) is connected to the boiler, the above mentioned
operations are controlled per boiler display and the „FH“ text appears.

Regulation of the heating temperature

Regulation can be performed via menu of the time remote control, as well as via the boiler´s control
panel.

Regulation of the DHW temperature (with external DHW tank installed)

Regulation can be performed via menu of the time remote control, as well as via the boiler´s control
panel.

Switching Summer/Winter

The Summer mode has priority over the eventual requirement for heating from the remote control.

Selection Eco/Comfort

If the DHW warming is turned off by the remote control, boiler is switched into the Economy mode.
Therefore is the button (See 7 - Pics.1 and 2) on the boiler control panel out of order. If the DHW
warming is turned on by the remote control, the boiler is switched to the Comfort mode. Therefore it is
possible to set one of the two modes through the button (See 7 - Pics. 1 and 2).

Controlled temperature ( OPENTHERM )

The OPENTHERM communication is built into the electronic control board of the boiler. All the boiler
functions are controlled through programmable Opentherm regulator (Ordering code: OT36A).
Programmable regulator and the room thermostat are not included to the boiler accessories.

10 9 8 7 6

5
4

3

2
1

100

90

80

70

60

50

40

30

20

-20-15-10-505101520

100

90

80

70

60

50

40

30

20

-20-15-10-505101520

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Regulation of the hydraulic pressure of the supply device

Pressure indicated on the water-gauge, when the heating system is filled being cold, has to be 1,0 bar.
If pressure of device decreases to minumum values, boiler display shows error F 37. Increase pressure
in device to value higher than 1,0 bar by using the filling tap (See 1). Manometer indicating pressure
without electrical connection is placed in the bottom part of the boiler.When the hydraulic pressure is
recovered, boiler activates 120 seconds long ventilation cycle displayed as „FH“. Afterwards it is
always necessary to close the filling tap (See 1).

Connection to the DHW tank of the KT Plus, KT small Plus boilers

Control electronics of the boiler serves to control the external DHW tank. Make hydraulic
connections following the scheme. Make electrical connections following the instructions in the
electrical scheme (Page 13). It is always necessary to instal thermal probe for the tank. Boiler control
system detects presence of the thermal probe and automatically configures itself, activates display and
appropriate control of DHW warming.

Scheme of connection to external tank:
8 DHW outlet
9 DHW inlet
10 Inlet into the heating system (CH flow connection)
11 Return flow from the heating system (CH return

connection)

209 Inlet into the exchanger of DHW warming
210 Return flow from the exchanger of DHW warming

11

2. Installation

General instructions

BOILER HAS TO BE INSTALLED EXCLUSIVELY BY SPECIALIZED AND TRAINED WORKERS AND ALL THE
INSTRUCTIONS GIVEN IN THIS TECHNICAL MANUAL HAVE TO BE KEPT, AS WELL AS ALL THE VALID
PRESCRIPTIONS, ALL REGULATIONS FROM THE EN NORMS, ALL STN NORMS, ALL SAFETY
PRESCRIPTIONS AND ALL WARNING SIGNS.

Place of the installation

Sphere of combustion of device is totally hermetic to the surrounding environment, and thereby it is possible to install
device in any kind of room. It is necessary to have sufficient ventilation in the room, where the boiler is going to be installed
to avoid from danger of the gas release (even if small). This safety norm is given by the Ordinance EHS Nr.90/936 for all the
gas using devices and also for devices with so called hermetic chamber. The boiler has to be installed in the dustless room,
where are no flammable materials or corrosive fumes.Room must be dry and the inside tempreture must not decrease under
0°C. Boiler has to be hung on the wall and therefore it is equipped with the console. Boiler has to be clamped in the way
ensuring its stable and efficient position. It is necessary to leave sufficient space for maintenance, in case that the boiler is
placed in the corner or if there is a furniture around. By installation , keep safe distance of the boiler surface from flammable
materials in dependence on combustibility grade:

- from materials of the combustibility grade B, C1, C2 100mm

- from materilas of the combustibility grade C3 200mm

- from materials of the combustibility grade not tested under STN 73 0853 200mm
Examples of the building materials sorting by combustible grade:

- combustible grade A - non-combustible (brick, adapting pieces, ceramic tiles, parget, mortar )

- combustible grade B -very hard combustible (heraklith, lignos, boards from basalt felt)

- combustible grade C1 - hard combustible (beech, oak, plywood, werzalit, hard paper )

- combustible grade C2 - medium combustible (pine wood, spruce chipboard, solodur)

- combustible grade C3 - easy combustible (wood-fibre-boards, polyurethane, PVC, molitane, polystyrene)
Solid materials of the combustible grade A can be used as non-combustible and isolation matters. Items made from
combustible materials must not be placed on the boiler and in the distance of 500mm from boiler.

Hydraulical connections

The ATTACK boilers are intended for heating systems with forced heating water circulation. Intensity of the water flow can
be set by switch on the pump. Before is the heating system filled with water, it is necessary to clean the system properly. It is
necessary to flush heating bodies and distribution pipes several times.To flush and clean the system properly it is
recommended to use cleansing articles. Filter must be mounted at the inlet into the heating system. It is recommended to use
copper filter with side cleaning and it has to be cleaned in regular intervals, depending on system clogging. Due to the
maintenance and servicing it is recommended to mount closing valves at the inlet and outlet of central heating and D.H.W.
Filter and valves are not delivered as accessories of the boiler. Heating system has to be also equipped with inlet valve
(installation with ATTACK KT boiler) with reverse flap, connected to water supply system to fill and pressure the heating
system. Boilers ATTACK KST and KZT Plus are equippped with filling valve with reverse flap.

Warranty is not valid for cases of clogging or stucking of exchanger or pump caused by dirts from the system!

Water callosity in the heating system cannot excess 3 mmval/l . In case of exchanger damage caused by boiler operation
with water of callosity higher than 3 mmval/l is warranty for exchanger also not valid. Expanse vessel of 7 or 8l installed in
the boiler enables connection to the closed heating system. If it is neccessary due to the size of the heating system, it is
possible to install additional expanse vessel. There should be difference of 15-20°C between outlet and inlet boiler heating
water. In case of reconstruction of the heating system or new system, it is recommended to use low-voluminous heating
appliances and distribution pipes in as small dimmensions as possible for quick system temperature reaction and
considerable flexibility of the system.
Process of filling with water: boiler has to be disconnected from electricity mains. Open deareation valves on boiler and
heating system. System has to be pressurized for at least 1 bar and deareated again. If the pressure decreases, it is neccesary
to pressurize it again.
Heating system must conform to valid norms and prescriptions:
STN 06 0310 - projection and installation of the central heating system,
STN 06 0830 - Assurance of appliance for central heating system
STN 06 0830 - Expanse vessel size
STN 07 7401 - Water in heating system
If the expanse vessel volume exceeds 7 or 8 litres it is necessary to add next expanse vessel with volume adequate to the
difference. To use maximum condensation effect it is necessary to dimensionize heating system to gradient 50/30°C. Fall
from the safety 3-bar valve has to be connected to the waste pipe. Heating system has to be equipped with suitable filter. For
maximum output of the heat exchanger, its correct function and long lifetime it is necessary to ensure minimum
overpressure of the heating system of 0,8bar. Built-in expanse vessel enables boiler connection to closed heating system.
Boiler has to be placed to ensure necessary operation conditions, adequately to design of the combustion air inlet and flue
gas exhaust.

V =V . v . 1,3

C

V - volume of expanse vessel

C

V - volume of water in heating system
v - appropriate volume increase by warming to t

m

t =80°C is v =0,029

m