LAARS NeoTherm NTV (Sizes 399-850 MBTU/h) - Service Manual - Manual (Page 55)

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Service Manual - NeoTherm 500
11. The location where you removed the Venturi is the
air intake for the blower. To clean the blower, blow
compressed air through the intake and spin the
impeller.
12. To reassemble, reverse the procedure listed above.
13. Replace the gasket on the inner surface of the cover
for the heat exchanger. The gasket should sit in its
slot as shown in Fig. B23-9.
14. When attaching the front cover of the heat exchang-
er, tighten the nuts in a cross-pattern. See Fig. B23-
10. (If you tighten all of the nuts on one side first,
this might bend or distort the cover.)
15. Check for gas leaks using a leak detection solution.
16. Finish reassembling the unit and turn on the power
and gas. Check for proper venting and combustion
air. Fire the boiler and check the combustion using a
combustion analyzer.
Fig. B23-9 - Gasket in correct position
Fig. B23-10 - Tightening sequence for nuts on front
cover
2 3
4
5 6
1
B23
cont.
Removing and Replacing the Blower (continued)