Laars OMNITHERM ONH1250, Инструкции по сборке, установке и эксплуатации

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Page 111
If black carbon soot buildup on the heat exchanger is
suspected, disconnect the electrical supply to the unit
and turn off the gas supply by closing the manual gas
valve on the unit. Access the heat exchanger through the
heat exchanger shrouds. Removal of the outer baffles
may be required for proper inspection. Use a flashlight. If
there is a buildup of black carbon soot or other debris on
the heat exchanger, clean per the following:
1. Shut off the main power supply to the boiler.
2. Turn off all manual gas valves connecting the boiler to
the main gas supply line.
3. Remove the blower assembly and burner from the
heat exchanger.
4. Disconnect the condensate drain line.
5. Attach a longer hose to the drain and run it to a
bucket.
6. Clean the heat exchanger by brushing away any
light accumulations of soot and debris. Use a non
metallic brush with soft bristles to avoid damaging the
surfaces of the heat exchanger tubes.
7. Once the tubes have been brushed clean, rinse the
tubes and combustion chamber with a small amount
of water to rinse all of the debris out of the bottom of
the flue collector and into the longer condensate trap
line which is being diverted into a separate container.
WARNING
Failure to rinse the debris from the heat exchanger
and temporary drain line may lead to clogged
condensate lines, traps and neutralizers.
Condensate pumps (if used) may also be damaged
from the debris left behind, possibly causing property
damage.
8. To place the unit back in operation, install all removed
components in the reverse order. Be sure all gaskets
are in place as the components are installed. Replace
any damaged gaskets. Do
not
reuse damaged
gaskets.
9. Place the unit into operation, checking all gas
connections for leaks. Confirm all fasteners are tight.
12.B.8 Gas Pressure Switches
The high and low pressure gas switches are manual
reset switches that act to cut power to the interlock
circuit if the gas pressure is too low or too high for proper
operation. There is a manual reset on both.
The gas pressure switches used are integrally vent
limited and do not require venting to atmosphere. To
remove a switch, remove the screw on the plastic
housing and pull the clear cover off. Disconnect the three
(3) wires from the screw terminals. Twist the switch off
the pipe nipple. Reassemble in reverse order.
Set the low pressure gas switch to 3” w.c.
Set the high pressure gas switch to 15”w.c.”
The
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