Servicing The Heat Exchanger Of The Boiler Shell; Checking Accessories - geminox THI 10-50 C Technical Instructions

Disassembling the burner/fan unit:
- Disconnect the electrical connections of the burn-
er/fan unit:
• remove the 2 terminals of the cables connect-
ing the ignition electrode (item. 3) to the igni-
tion transformer (rep. A,
• removal the terminal of the cable connecting
the ionization electrode (item. 2) to the X2-05
terminal of the control panel,
• removal at the fan (item. 7):
. of the connector of the power cable from the
fan,
. of the connector of the PWM signal from the
fan,
- disconnect the air/gas control (item 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 the fan (item. 7) using a domestic vacuum
cleaner by placing the suction device over the air
inlet and outlet successively.
Cleaning 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,

2 - SERVICING THE HEAT EXCHANGER OF THE BOILER SHELL

- The heat exchanger must be cleaned once the
burner has been disassembled (section 1 -
page 13 - chapter III - MAINTENANCE - SERVI-
CING MANUAL).

3 - CHECKING ACCESSORIES

- Check that the safety and control devices (3 bar
safety valve, air bleed, safety control box, etc.)
are operating properly.
- Clean the condensate drain siphon and then fill it
with water.
- Also check that neither the installation nor the
boiler present any water or fuel leaks (leaks may
produce a risk for safety and shorten the lifes-
pan).
- Check the ignition electrodes (3) and the ionisa-
tion electrodes (2).
Fig. 8
2.25
When reassembly the burner/fan unit:
- Replace the seal at the nut (item. 9) and check
the airtightness of the gas,
- when refitting the fan on the burner :
• check the correct positioning of the fan/burner
gasket (item. 10),
• check the airtightness of the gasket and repla-
ce it if necessary.
- check airtightness at the burner and boiler shell
levels,
- 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.
- When it is frequently necessary to add water to
maintain pressure in the installation, even though
no leaks have been discovered, perform an ex-
pansion vessel check (section 4 - page 15 -
chapter III - MAINTENANCE - SERVICING MA-
NUAL).
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MAINTENANCE
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