Laars MASCOT LX, Руководство по обслуживанию

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44
Mascot LX Service Manual
Fig. B11-1 - Upper part of cabinet
(typical installation, front cover removed)
Replacement Procedure -
1. Switch off the power switch on the front panel to turn
off power to the machine.
2. Remove the upper front panel.
3. Turn off all manual gas valves connecting the boiler
to the main gas supply line.
4. Disconnect the 120V and control signal connections
from the blower.
5. Disconnect the wiring harness for the gas valve. It is
held in place by a small Phillips-head screw.
6. Undo the two cap-head screws that support the end
of the air line. This assembly hangs from the end
of the Venturi. The air line runs to the air pressure
switch. Once the assembly is free, swing the end of
the air line out of the way to the left.
7. In order to remove the blower, you will need to get
the spark rod and flame sensor out of the way. Re-
move these parts as shown in Fig. B11-2.
8. Loosen the union nut between the gas inlet pipe and
the gas valve. Be careful not to drop the O-ring.
9. Remove the four nuts connecting the bottom of the
blower to the combustion chamber. There are two
sets of nuts here - remove the smaller (inner) ones.
10. At this point, you should be able to “roll” the blower
assembly forward and out of the front of the unit.
Note that the Venturi and gas valve remain connect-
ed to the blower.
11. To reassemble, reverse the steps listed above. After
re-tightening the union in the gas line, check for gas
leaks using a leak detection solution.
Union in
gas line
Air line to
pressure
switch
Nuts for mount -
ing to burner
Fig. B11-2 - Detail view - Bottom of blower
Venturi
Gas valve
Spark rod Flame
sensor
Remove these
cap screws.
B11
cont.
Blower Problems (continued)