Xylem MM 110C Series PFC 1G PFC 1GR Modulating Pneumatic Liquid Level Controls - Manual (Page 3)

3
TANK INSTALLATION
START-UP AND ADJUSTMENT PROCEDURE
AIR SUPPLY CONNECTIONS
It is good practice to install an air filter in the air supply
line. Control must be supplied with clean, dry instrument
air at 20 psi. (Supply pressure in excess of 20 psi will
cause a slight downward shift of the set point. Supply
pressure less than 20 psi may not give sufficient out-
put pressure to achieve control valve close-off.)
Connect air supply to either of the two 1/8” NPT ports
directly below the gauge marked SUPPLY. Connect
either of the two ports below gauge marked OUTPUT
to valve or other control device. (Alternate ports are
provided for convenience; be sure to plug the two
ports not used with plugs provided.)
Remove cover from head of control. Carefully remove
cardboard shipping stop under the yoke, by straightening
the tabs on the sides and folding it lengthwise. Turn on
air supply.
Check the supply gauge for proper air pressure—20 psi
maximum. Gently swing the yoke through its full arc of
travel to make sure the magnets do not rub against the
tower tube (A).
Check the output gauge for proper output. Move the
yoke through its full arc; output should range from 3 to
15 psi. With the yoke in a horizontal position, the out-
put should be approximately 9 psi.
To Start Operation (After all piping installation has been completed)
NORMAL
OPERATING
LEVEL
BALL VALVE
GATE VALVE
DUAL
VALVES
FOR
BLOW
DOWN
OUTPUT AIR TO
CONTROL DEVICE
1”
SUPPLY AIR
5” Min. Clearance Required
to Remove Cover
1/8” NPT
Output
1/8” NPT
Supply
7” O.D.
A