KDB-GOM
Series
- 81 -
No
3
Part name
Modulating gas control valve
Replacement steps
Disassemb
ly
①
Unplug the boiler from the electric outlet and open the external cover.
②
Close the main gas valve installed on the gas supply pipe outside the boiler.
③
Loosen the flexible part connected to the gas inlet connection using manual tools (monkey spanner/group joint
plier).
④
Separate the four electric inlet wires connected to the gas control valve.
⑤
Separate the six wires connected to the gas control valve (4 ON-OFF valve, 2 proportional control valves ).
⑥
Separate the gas control valve and the nozzle by unscrewing the two screws connecting them.
⑦
Separate the board holding the ignition transformer and the air pressure switch from the nozzle by unscrewing
one screw.
⑧
Separate the gas control valve from the boiler.
A
sse
m
b
ly
①
Fix the gas control valve to the external base.
②
Screw the four screws fixing the gas control valve to the external base.
③
Screw the two screws connecting the nozzle and the gas control valve (*check for the existence or
nonexistence of O-ring when connecting).
④
Assemble the parts making sure there is no gas leak.
⑤
Open the main gas valve.
⑥
Connect the six wires of the gas control valve correctly.
⑦
Fix the board holding the ignition transformer and the air pressure switch to the nozzle by screwing one screw.
⑧
Plug the boiler to the electric outlet.
Caution
1. Check whether the gas pipe connecting O-ring is correctly assembled.
2. Make sure not to switch the color of the connection terminals.
3. Perform a gas leak test using soap foam after assembly.
⑧
⑦
⑥
④