Servicing The Heat Exchanger Of The Boiler Shell; Tank Maintenance - geminox THI 2-17 B 120 Technical Instructions

Disassembling the burner/fan unit:
- Electrically disconnect the burner/fan unit:
• remove the 2 cable lugs connecting the ignition
electrode (3) to the ignition transformer (A),
• remove the cable lug connecting the ionising
electrode (2) to the X2-05 terminal of the boiler
control panel,
• remove the fan (7):
. from the connector of the fan power cord,
. from the connector of the fan's PWM signal,
- disconnect the air/gas servo-system (B) from the
gas valve,
Disassembling the fan:
- Unscrew the four screws (1) fixing the fan (7) to
the burner's air sleeve (6),
- Clean it using a domestic vacuum cleaner by pla-
cing the suction device over the air inlet and outlet
successively.
Disassembling the burner:
- Unscrew the four screws fixing (5) the burner (4)
to the boiler shell (8),
- Disassemble the nut (9),
- Clean the burner (4) using a domestic vacuum
cleaner by placing the suction device over the air
inlet and the gas inlet successively,
- Check the ignition electrodes (3) and the ionisa-
tion electrodes (2).

2 - SERVICING THE HEAT EXCHANGER OF THE BOILER SHELL

- The heat exchanger must be cleaned once the
burner has been disassembled (section 1 -
page 7 - chapter II - MAINTENANCE - SERVI-
CING MANUAL).

3 - TANK MAINTENANCE

- The stainless steel hot water tank is resistant to
lime scale. Nevertheless, the access flap gives
access to the tank and the exchanger.
Note :
- See section 5.2 - page 34 - chapter IV - INSTAL-
LATION - INSTALLATION MANUAL
Fig. 5
2.25
When fitting back the burner/fan unit:
- Replace the seal at the level of the nut (9) and
check that there are no gas leaks,
- when fitting the fan back onto the boiler:
• check that the fan/burner seal (10) is correctly
positioned,
• check that there is no leakage at this seal and
replace it if necessary.
- check that the burner (4) and boiler shell (8) have
no leaks - replace the seal if necessary.
- Sprinkle the heat exchanger with water. The wa-
ter is evacuated through the condensate evacua-
tion siphon,
- when reassembling the burner onto the boiler
shell check the correct positioning of the gasket.
- 8 -
MAINTENANCE
3
39
2
40
ZEM-31-0-2-17