FORM 100.10-NOM2
25
YORK INTERNATIONAL
Instructions For Checking Unit With Variable
Inlet Vanes Prior To Startup of Unit
1.
Ease of Operation
- Prior to the installation of the
electric or pneumatic operator motor, check the ease
of the operation of the vanes by moving the opera-
tor arm back and forth by hand. If the vanes are
difficult to turn, Neck to see that no foreign mate-
rial has lodged in the assembly during shipment or
installation. Lubricate the bearings with a silicone
spray lubricant. Wipe away any accumulation of
dust or dirt from the bearings prior to oiling and
after lubrication. The bearings are located at each
end of the blades and on the control arm. When
oiling the bearings, work the control arm back and
forth to work the oil into the bearings.
2.
Synchronization of Vanes
- The vane linkage
should be adjusted so that the vanes on both sides
of the fan operate in unison. When one side is com-
pletely closed the other side should also be closed.
3.
Connecting Linkages and Push Rods
- The push
rods between the operating ring and the jack shaft
crank arm on the vanes must always be at an angle
of at least 40 degrees with respect to the jack shaft
crank arm to which it is attached. If not, maximum
power against rotational motion will be compro-
mised. (See Figure 29)
4.
Position of Vanes
- When completely open, vanes
are approximately 75 degrees with respect to the
plane of the cones. Do not try to force the vanes
open further or damage will occur. The vanes do
not always close completely and should never be
forced into a completely closed position.
5.
Installation of Operator
- The connecting linkage
between the (drive) crank arm on the jack shaft
and the actuator should be made as stated above.
The travel of the actuator crank arm should be ad-
justed so that it is somewhat less than the travel of
the crank arm of the jack shaft. The Pneumatic or
FIG. 28 –
VARIABLE INLET VANE INSTALLED IN
INLET CONE AIRFOIL FAN
Electric Operator Motor should never be adjusted
so that a force is placed on the unit jack shaft crank
arm when the vanes are either completely open or
closed. (See Figure 30) for the operator torque re-
quirements for each unit.
6.
High Pressure Units
- When vanes are installed
in high pressure units (total static pressure in ex-
cess of 6 inches of water) the vanes should be ad-
justed so that complete closure cannot occur. The
linkage should be adjusted so that the vanes are
always approximately 20% open.
00417VIP
JACK SHAFT
CRANK ARM
2
