5
Thermometer
Setti ngup
heating
Operation
mode
switch
Pressure gauge
6
Res et
Central- heati ng an d ho t-wat er mode
Hot- wate r mode
Off
Service
function
Signal lig ht
On
Signal lig ht
Operatio n
Signal lig ht
Breakdo wn
O
Settings up
hot-water
temperature
The control centre for controlling boiler operation is a modulation electronic board
equipped with a microprocessor. Sensor state and value is scored by software which also
gives orders to active elements gas valve, ignition electronics, circulation pump. On the
inside distribution of heating water outlet there is an emergency thermostat, pressure switch
and pressure gauge signalling the pressure in the heating piping.
In the case the temperature of outgoing heating water overcomes 95°C, the emergency
thermostat puts the boiler in emergency condition following by putting it out of operation.
In the case the pressure in the heating system falls under 1 bar, the pressure switch puts the
boiler out of operation. In inside distribution of heating water inlet there is a 3-bar-safety
valve and a circulation pump. In the bridging of hot water inlet and heating water inlet
there is a ball valve serving for filling the heating system from the distribution net. In the
rear part of the boiler there is an 8-liter expansion tank connected with the pump. Outside
case is treated with dust paint with thermal endurance up to 180°C.
The thermometer and pressure gauge take the temperature and pressure in the heating
system. With a button for setting the heating temperature, a user can set the temperature of
water in the heating system in the range of 35 - 85°C. The recommended range is 55 -
85°C. With a control button for setting up hot-water temperature, a user can set requested
outlet temperature of hot water in the range of 35 - 60°C. Signal light
signals a
condition, when the electronics did not manage to burn the boiler (e.g. because of gas
delivery failure). Return to operation condition can be made by brief turning the operation
mode switch into the right extreme position (reset) when controlling the boiler operation.
The signal light
signals burning of the boiler. The signal light
serves to
signalling of starting the boiler mode. The operation mode switch has these positions:
– the boiler off
– summer operation (hot-water preparation on, heating off)
– winter operation (hot water and heating on)
– unblocking the boiler breakdown (reset)
Control front board of the boiler
Breakdown
Operation
On
– service testing function
The heating system must include a proper filter. To utilize the maximum output of the
boiler it is necessary to ensure minimum pressure in the heating system of 1 bar for right
functioning and long lifetime. A built in expansion tank enables connecting the boiler to
closed heating system.
The boiler is to operate on natural
gas of 20 mbar nominal pressure in the distribution net. The boiler is located so as to ensure
necessary operating conditions whether it is an appliance with open combustion chamber
(flue) or with closed combustion chamber (turbo) and with regard to the ways of
combustion air supply and waste gas exhaust.
The service of the boiler must be carried out by the rules described in this manual. Except
service works, the user must not carry out any repairs on the appliance nor adjustments or
dismounting and cleaning the inside parts of the boiler. The boiler can be operated only by
an adult.After leaving home in winter (on holiday...) a supervision by a trained person is
needed. If there is a danger of approach of inflammable (combustible) gases or fumes to the
boiler (e.g. when lying a PVC flooring), it must be put out of action early. The user is
obliged to take care of proper use of the boiler according to this instruction which is also a
condition to acknowledge guarantee. When putting the boiler to operation, the service
worker must instruct the user about boiler operating.
Fast-heating wall boilers ATTACK NST, NSK are equipped with copper heat-exchangers
protected on surface with silicone coating on the base of aluminium, resistent to 430°C.
These are exchangers with separated systems to warm up hot water and heating water. A
big adventage of this exchanger is place and weight saving. Maximum operation pressure
for heating circle is 300 kPa (3 bar) by 85°C, for hot-water circle 600kPa (6 bar) by 60°C.
Minimum operation pressure is 100 kPa (1 bar). The heat-exchanger is located in the upper
part of combustion chamber and is fitted with an automatic deareating valve, which leads
over closing chamber. For minimum loses during heat transmission it is necessary to keep
the surface of heat-exchanger lamellas clean.
The source of heat is a gas burner of modern unit-built design made from stainless steel. It
is located in the bottom part of combustion chamber. There are two electrodes in the burner.
One of them is a spark ingition electrode, another is a inonization probe for burning
control. Combustion chamber is made from aluminium-coated steel plate with inside
thermal insulation. Over the combustion chamber (NST) is a waste-gas collector with a fan
for waste-gas draw. With the help of silicone tubes is the fan connected to a switch of
differential pressure (manostat). In the flue version (NSK) there is a draw breaker with a
waste-gas thermostat. In the upper part of the exchanger there are thermal probes for
heating and hot-water system. The inside water piping in the boiler is made from copper
pipes. Closing chamber of the boiler (NST) is made from aluminium-coated steel plate.
Openings in the closing chamber are sealed with silicone seal. On hot water inlet there is a
water-passage sensor installed. Fast-heating wall boilers ATTACK NST and NSK are
equipped with automatics and continuous regulation of output.
On hot-water inlet to the boiler it is necessary to install a
magnetic or electromagnetic water treatment device.
The user with his or her signature
in the letter of guarantee confirms having been instructed with the boiler operating.
Conditions of service:
Technical description
Summary of Contents for Attack NSK
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