Laars MagnaTherm MGH1600, Инструкции по установке и эксплуатации для

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LAARS Heating Systems
Page 84
11.B.8 Heat Exchanger Tubes
Black carbon soot buildup on the external surfaces
of the heat exchanger is caused by one or more of
the following; incomplete combustion, combustion air
problems, venting problems or heater short cycling.
Soot buildup or other debris on the heat exchanger
may restrict the flue passages.
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:
CAUTION
Black carbon soot buildup on a dirty heat
exchanger can be ignited by a random spark or
flame. To prevent this from happening, dampen
the soot deposits with a wet brush or fine water
spray before servicing the heat exchanger.
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.
NOTE - The Warranty does not cover damage
caused by lack of required maintenance, lack of
water flow, or improper operating practices.
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 appliance in operation according to
Section 9, checking all gas connections for
leaks. Confirm all fasteners are tight.
11.B.9 Gas Pressure Switches
The high and low pressure gas switches are 120
Volt 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 pressure gas 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 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..”
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.