Owner's manual

NOTE
Prior to connecting supply air line or signal
air line, purge air system until all moisture
and debris are blown out.
2. Purge air supply system and connect air
supply line to the air filter inlet. Run a
second line from the air filter outlet to the
power positioner supply air inlet connection.
All fittings arc l/4 inch NPT.
3. Purge signal air line and connect to signal
air connection on paver positioner.
2-5. CURRENT TO PNEUMATIC SIGNAL
CONVERTER (I/P) ELECTRICAL
CONNECTIONS. Connect electrical signal input to
I/P converter and calibrate if necessary. Refer to
paragraph 4-3 for calibration procedures. The
connections must be made by screw terminals. If the
I/I’ has pigtail leads instead of screw terminals, the
connection must be made at a terminal block. Gage of
wire required is 18 gage signal wire. The signal that
will control the JfP should have a range of 4 to
20 mA at a voltage of 24 Vdc.
a. Direct Acting. Connect positive signal to black
lead and negative signal to white lead.
b. Reverse Acting. Connect positive signal to
white lead and negative signal to black lead.
2-6. LINKAGE INSTALLATION. Install linkage for
either a characterized flow control device, or linkage
for a linear flow control device. Linkage described is
pipe (3/4 inches diameter), maximum length of
21 feet 9 inches. Maximum horizontal offset is
22 inches, at widest part of linkage system.
a. Linkage Installation for a Characterized Flow
Control Device.
1. Measure length of driven lever (R,) on
device to be controlled (Figure 2-5).
2. Attach the linkage clevis to the power
positioner’s drive lever so that distance R2 is
equal to R,.
3. Close damper of device being controlled to
minimum flow position.
DRIVE
LEVER ---
L
POWER
POSITIONER
AIR
DUCT
Figure 2-5. Linear Linkage Design
4. Measure angle (9,) of device’s driven lever
from vertical center line.
5. Install power positioner’s drive lever so its
angle (tl,) is the same as the device’s driven
lever @J.
6. Measure distance (!?) between drive and
driven levers connection holes. Allowing for
clevis length, cut pipe to fit this
measurement. Install &vises.
7. Install linkage pipe between drive and driven
levers. Check for freedom of movement by
operating power positioner’s manual lever.
Make minor adjustments to linkage length
by turning linkage clevis fitting in or out as
“C.C!C.S~.