Internal Cleaning (Washing) Of Secondary Heat Exchanger; Boiler's Operation Check; Check Of Heat Carrier Pressure Sensor In The Heating System; Check Of Heat Carrier Overheating Protection In The Heating System - BaltGaz NEVALUX-8230 User Manual

2) prepare 10% solution of citric acid (100 g of powdered citric acid for 1 liter of warm water);
Fill this solution into heat exchanger's pipeline;
3)
Keep this solution there for 10-15 minutes, then drain it and wash heat exchanger's pipeline (coil)
4)
thoroughly with water and if necessary to repeat all the procedure;
5) Mount the heat exchanger with new gaskets;
6) Check the joints of gas, heat carrier and water subject to disassembling for air-tightness (see p. 16.2.1 , page
39).
Also it is necessary to clean the DHW circuit water filter. It is located in the DHW flow sensor and can be demounted
by means of screwdriver or any other sharp instrument.
I
16.1.4. nternal cleaning (washing) of the secondary heat exchanger
During the exploitation there is a chance of scale deposit appearance on the inner surfaces of the secondary heat
exchanger pos. 3 (see p. 13.1, page 27).
You must demount the secondary heat exchanger (see p. 5), page 44).
The instructions on scale deposit removal are represented in 16.1.3.
Also it is necessary to clean the DHW water filter. It is located in the DHW flow sensor and can be demounted by
means of screwdriver or any other sharp instrument.

16.2 Boiler's operation check

At every boiler's technical service it is necessary to check:
1) Constant voltage regulator presence;
2) Voltage and frequency of inlet current in the boiler in accordance with indicated technical requirements on the data
plate (see p. 2.2, page 5);
3) Whether natural gas is supplied with the rated pressure 1,3-2,0 kPа (130-200 mm w.g.) or liquefied gas with the
rated pressure 2,9 kPa (300 mm w.g.) It is necessary to measure pressure while the boiler is on.
Before checking gas and hydraulic systems for air-tightness, or any other safety device, it is necessary to put a casing
and sealing cap off from the boiler (see p. 17.1, page 41, the first 7 points).
Checking the boiler's gas, heating and DHW systems on air-tightness.
16.2.1
ATTENTION! Checking of gas joints' air-tightness is performed by soap solution bubble test (or any other safe
methods without using open flame sources). Appearance of bubbles means gas leakage.
Check of air-tightness is performed on such joints as: gas supply regulator with gas supply pipe, gas pipe with burner
block and gas supply regulator, and also in the control points A and B of gas supply regulator (see scheme 13, page 25).
Checking the heating and DHW systems for air-tightness is performed alternatively in heating and DHW modes. The
joins of the boiler with the heating system and DHW, the heat exchanger with the hydraulic group, the air-tightness of
hydraulic group elements are checked. Leakage in the joints is not allowed.
In case of gas, heat carrier or water leakage detection it is necessary to remove it by tightening the nuts (gauges) or
installing a new sealing.
16.2.2 Checking of safety device operation
16.2.2.1 Checking of heat carrier pressure sensor in the heating system
Before switching the boiler on, put the cables off from the pressure sensor 14 (see p.
attempt the boiler will show the symbol "04" on display, signaling about the emergency situation in the heating circuit..
After eliminating the reasons of boiler's emergency switching off (connecting the cables to the thermo relay),and
pressing the button K6 (RESET), the boiler should automatically switch on.
16.2.2.2 Checking of heat carrier overheating protection in the heating system
Put the cables off from the thermo relay 15 from the operating boiler (see p.
off and show the symbol "02" on display. After eliminating the reasons of the emergency switching off (connecting cables to
the thermo relay) and pressing the button К6 (RESET) ,the boiler should automatically switch on.
16.2.2.3 Checking of bypass valve operation
When the boiler is working in the heating mode (see p.
heating system inlet. Bypass valve 20 (see p.
through the bypass pipe. The bypass pipe must warm up. After checking it is necessary to open a stop valve on the heating
system inlet.

16.2.2.4 Checking of safety valve operation

Checking of operation of the safety valve 22 (see p.
(counterclockwise) in order to let water ejection out of the valve. The valve should close by itself.
16.2.2.5 Air removal valve checking
If a cap of the air removal valve 8 (see p.
should be removed through the valve.
16.2.2.6 Checking of gas supply regulator operation
Set the heat carrier temperature in the heating system 50 °С. During the boiler's operating it is necessary to look after
temperature values on the display and also gas pressure value in the burner (see section
shown on display will be higher than the set one for ~ 1-2 °С, gas supply regulator 9 (see p.
gas pressure in the burner (flame height will decrease).
Before switching the boiler on, disconnect one of the cables of the modulator coil on the gas supply regulator. An
emergency code "07" will blink on the display, which signals about regulator's refusal to operate. After eliminating the
reason of boiler's emergency switching off (connecting the cable to the regulator), the boiler will switch on automatically.
16.2.2.7 Ionization plug checking
Remove the cable from the ionization plug 6 from the operating boiler (see p. 13.1, page 27). The boiler should switch
off and show the symbol "01" on display. After eliminating the reason of boiler's emergency switching off (connecting the
cable to the ionization plug) and pressing the button К6 (RESET), the boiler will switch on automatically.
3.2.4, page 10) it is necessary to shut off a stop valve on the
13.1,
page 27) should direct the heat carrier bypass from the heating system
13.1 , page 27) implies turning the knob on the valve to the left
13.1 , page 27) is open, the heat carrier should not run out of it. Only air
13.1
, page 27). At launching
13.1, page 27). The boiler should switch
11
, page 25). When the temperature
13.1 , page 27) should reduce