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Flame detection is based on the principle of monitoring ionization current. Ionization current is measured by micro
ammeter, consequently connecting it to the circuit of the ionization plug. Optimal value of the ionization current is 3...5 μА.
Reasons of reduced ionization current can be the following: «current leakage», bad connection with the "ground" or
wrong plugs connection ( it is necessary to replace cables of ionization and ignition plugs with each other). Sometimes low
ionization current can be caused by gas-air mixture inappropriate for requirement or appearance of carbon deposit on the
ionization plug while using a boiler.
16.2.2.8
Checking of combustion products removal control devices
Switch the boiler on, preliminary disconnect the smoke exhaust flue pipe from the smoke exhauster. Cover the hub,
mounted on the fan's hose with a metal sheet. The boiler should switch off and show the symbol "03" on display which
signals that boiler stops operating because of the draught lack in the smoke exhauster.
After eliminating the reason of boiler's emergency switching off, and also removing the blockage by means of the
button К6 (RESET),the boiler should automatically switch on. After performing such checking, it is necessary to mount the
smoke exhaust flue pipe back.
16.2.2.9 Checking of CHtemperature sensor
Before switching the boiler on, disconnect the cables from the CHheat carrier temperature sensor 16 (see p.
27) When trying to launch the boiler, it should show the symbol "05" on display which signals about the CHtemperature
sensor's failure. After eliminating the reason of boiler's emergency switching off (connecting the cables to the sensor) the
boiler should automatically switch on.
In order to check the temperature sensor, measure its resistance: R=10 kOhm (at 25 °С).
16.2.2.10
Before switching the boiler on, disconnect the cables from the DHW circuit water temperature sensor 17 (see p.
page 27). When trying to launch the boiler in DHW mode, it should show the symbol "06"on display which signals about
the DHW temperature sensor's failure.
After eliminating the reason of boiler's emergency switching off (connecting cables to the sensor) the boiler should
automatically switch on.
In order to check the temperature sensor, measure its resistance: R=10 kOhm (at 25 °С).
16.2.2.11
Render the boiler into DHW mode (see p.
the DHW circuit flow sensor 23 (see p.
After connecting the cables back, boiler should automatically switch on.
16.2.2.12
Measure air pressure through the expansion tank's valve (nipple), located in the upper part of the expansion tank. Air
pressure should be (0,10,02) MPа. If the air pressure in the expansion tank is lower than the allowed one, it is necessary to
increase it up to the required value by the pump or using any other safe method. If the inner membrane is damaged (when
measuring the air pressure, the heat carrier comes out of the valve or air pressure doesn't restore), it is necessary to replace
the expansion tank.
16.2.3 Checking of the air inlet and combustion products output systems for air-tightness
Visually check the smoke exhauster's integrity. Sags and gaps in the joints of the smoke exhauster's elements are not
allowed. Joints of the separate smoke exhauster, in the elements of which the presence of sealing rings or cups is provided
should be sealed with aluminum thermo resistant tape or any other material with similar properties.
16.2.4 Checking of DHW water consumption
Determine maximum water flow in DHW line with a draw down gauge. Water consumption should be at least 2,5
l/min. If water flow is less than 2,5 l/min, it is necessary to clean the boiler's inlet water filter in DHW line (if the filter is
mounted). If cleaning (washing) of the secondary heat exchanger was not effectuated, it is necessary to effectuate it (see p.
16.1.4, page 38).
16.2.5 Checking the heating system for stoppage
When boiler is operating in the heating mode (see p.
hot. If bypass pipe is hot constantly, it is necessary to clean the boiler's inlet hydraulic filter in the heating line (if the filter is
mounted), and also in other places of the heating system where contamination is possible. Before cleaning the filter, it is
necessary to switch the boiler off and drain the heat carrier out of the boiler (see p.10.4and
stop valves, drain the heat carrier out of all heating system).
17 BOILER'S DISASSEBMBLING AND DISMANTLING OF MAIN UNITS
Boiler's disassembling and all works connected with dismantling of the boiler's main units are performed only after
the boiler is completely switched off, (the boiler must be switched off, the taps on the heat carrier, water and
gas lines by the inlet into the boiler are closed, the boiler is disconnected from the power line)
For any works connected with dismantling, it is necessary to drain the heat carrier out of the boiler (see p.
24).
17.1 Burner block dismantling
To disassemble the burner block it is necessary to:
1) Switch the boiler off (see p.
2) Unscrew 4 self-threading screws 1(see Scheme 16) of casing fastening to the boiler's bottom panel;
3) Remove the cap of front panel;
4) Unscrew two self-threading screws 3 and four self-threading screws 2 (see scheme.
panel to the casing;
Checking of DHW circuit temperature sensor
Checking the DHW circuit water flow sensor
3.2.2,
page 9), open the water tap on the DHW line. Remove the cables from
13.1,
page 27). The boiler should enter into the stand-by mode.
Checking of air pressure in the expansion tank
3.2.4
, page9) it is necessary to check whether the bypass pipe gets
10.4
, page 24);
13.1
, page
13.1
,
10.5
, page 21) (if there are no
10.5
, page
16
) of fastening to the front
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