Vaisala LT31, Руководство пользователя, Страница: 221 / 294

Chapter 6 ______________________________________________________________ Maintenance
VAISALA ______________________________________________________________________ 221
4. The measurement unit is fixed with two fastening screws. Through
the mast adapter of the support unit, these two hex-socket screws,
size 4, can be reached. See Figure 78 on page 118.
5. Now the four hex-socket screws, size 3, are accessible, which fix
the blower onto the support unit. See Figure 126 below.
0408-018
Figure 126 Fastening Screws of Blower Unit
6. Open the junction box and disconnect the blower lines from the
terminals.
7. Install the new blower unit (including blower capacitor and particle
filter). Take care of the cable routing through the feed-through hole
in the support unit, and the cable feed-through of the junction box.
8. Tighten the four blower fastening screws carefully.
9. Reconnect the blower lines and the blower capacitor to the
terminals and close the cable feed-through and the junction box
tightly.
10. The measurement unit must now be mounted in the same way as
described in sections Mounting Receiver Measurement Unit on
page 124 and Mounting Transmitter Measurement Unit on page
114.
11. Make sure that the enclosure is parallel with the support unit.
12. Secure the fastening screws of the measurement unit carefully.
13. Turn on the AC power switch (and also the battery backup switch,
if installed).
14. Carry out an operation check for the blower system as described in
section Checking Operation on page 201.