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INSTALLING AIR LINES
Remove protective shipping cover and install air line(s).
All 1000 series hubs are shipped completely pre-adjusted for
specified spring pre-load and pitch travel.
ROTARY JOINT
Hook up instrument line to connection on rotary joint (See Figure
14).
Figure 14
Rotary joint assembly used to deliver controlled pressure to hub
has mechanical seal with ball bearings to assure alignment. It is
very important that the air line is installed with some slack.
IMPORTANT: Do not pull air line to rotary air joint tight
when installing hub. Instrument air pressure should be 3-15 psi.
SUPPLY PRESSURE FOR VALVE POSITIONER OR BIAS RELAY
Hub Type
Fan Diameter (ft)
9-14
Standard
16-20
Acting Hub
All Sizes
Reverse
All Sizes
Acting Hub
Installation manual 1000H
Blade Type
8
B, C, D or H
B, C, D or H
B or H
W, HW
All
VALVE POSITIONER
Connect instrument line to connection marked INSTRU.
Connect supply line to connection marked SUPPLY (See
Figure 15). Instrument line hookup is all that is necessary
before operating. Instrument air pressure should be 3-15 psi.
Valve positioners are adjusted for 3 psi instrument starting
point. Supply air pressure should be set to level according to
table below.
Figure 15
BIAS RELAY
Connect both supply and instrument lines. Check instructions
included with bias relay. If problems are encountered, contact
Hudson fan engineer. Instrument air pressure should be 3-15 psi.
Bias relays are adjusted for 3 psi instrument starting point. Supply
air pressure should be set to level according to table below.
Hub Spring
To Vary Pitch
Yellow
White
Brown/Black
Brown/Black
White
Page 6 of 10
Supply Pressure (psi)
To Check Blade Pitch
Travel at Rest
35
45
45
55
75
85
75
85
45
55
May 2015
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