Installation manual 1000H
Page 6 of 10
May 2015
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.
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.
SUPPLY PRESSURE FOR VALVE POSITIONER OR BIAS RELAY
Hub Type
Fan Diameter (ft)
Blade Type
Hub Spring
Supply Pressure (psi)
To Vary Pitch
To Check Blade Pitch
Travel at Rest
Standard
Acting Hub
8
B, C, D or H
Yellow
35
45
9-14
B, C, D or H
White
45
55
16-20
B or H
Brown/Black
75
85
All Sizes
W, HW
Brown/Black
75
85
Reverse
Acting Hub
All Sizes
All
White
45
55
