4660 Pressure Pilot
Instruction Manual
Form 5200
September 2004
9
Setting the High Set Point
Note
To ensure that full output pressure will
be indicated during the following
steps, make sure the previous six
steps of the Preliminary Adjustments
portion of this section have been
completed before proceeding.
WARNING
To avoid personal injury or property
damage caused by a sudden release of
pressure, do not exceed the Bourdon
Tube rating (see tables 2 and 3).
To set the high set point pressure, perform the
following three steps:
1. Adjust the external pressure source to the
desired high set point pressure.
2. Check that full output pressure is being registered
by using a pressure gauge installed in the output
pressure line or by using the optional output
indicator (key 88). The optional output indicator
shows a green color when the output pressure is at
full pressure and black when the output pressure is
at zero.
3. Slowly turn the HIGH SET knob counterclockwise
until the desired high set point is obtained. The high
set point is obtained when the output pressure of the
pilot has changed from full output to zero.
4. Lock the locking disk (key 69).
Setting the Low Set Point
Note
To ensure that full output pressure will
be indicated during the following
steps:
D
Make sure that the first six steps
of the Preliminary Adjustments portion
of this section have been completed
before proceeding, and
D
Make sure the difference between
the high set point pressure and the
low set point pressure is greater than
or equal to the appropriate Set Point
D
P
MIN
value specified in tables 2 and 3.
To set the low set point pressure, perform the
following three steps:
1. Adjust the external pressure source to the
desired low set point pressure.
2. Check that full output pressure is being registered
by using a pressure gauge installed in the output
pressure line or by using the optional output
indicator (key 88). The optional output indicator
shows a green color when the output pressure is at
full pressure and black when the output pressure is
at zero.
3. Slowly turn the low set point knob (key 67)
clockwise until the low set point is obtained. The low
set point is obtained when the output pressure of the
pilot has changed from full output to zero.
4. Lock the locking disk (key 69).
Alternate Set Point Adjustment
Procedure
This procedure may be used to closely approximate
the desired high and low set points when no external
pressure source is available to simulate process
pressure. If the pilot does not have the optional
output indicator (key 88), provide a means of
indicating the output pressure. Refer to figure 5.
For high-low constructions, perform steps 1 through
7. For high-only constructions, perform steps 1, 2, 4,
and 5. For low-only constructions, perform steps 1
through 3, 6, and 7.
Note
Make sure the first 6 steps of the
Preliminary Adjustments portion of
this section have been completed
before proceeding.
1. Refer to the warning at the beginning of the
Operating Information section. Make sure the
Bourdon tube contains no pressure.
2. Connect supply pressure to the pilot.
3. Turn on the supply pressure. To check that the
supply pressure is on, press the SUPPLY TEST
button in the cleanout assembly (key 54) until a flow
sound is heard.
4. Turn the LOW SET knob counterclockwise until it
has reached the end of its travel.
5. Turn the HIGH SET knob counterclockwise until
the high set point pivot just comes in contact with the
flapper. The pilot should have full output pressure
(green indication on the optional output indicator).
