Installation; Mounting; Actuator Mounting; Panel Mounting - Fisher 4660 Instruction Manual

Type 4660

Installation

WARNING
To avoid personal injury or property
damage caused by a sudden release of
pressure, do not exceed the process
pressure values in table 4 or the maxi-
mum supply pressure values in table 1.
The following instructions describe various mounting
and connecting procedures. Pilots may be connected
together to accommodate requirements for single and
dual outputs as well as single and dual process pres-
sure lines. Figure 2 shows some typical connections.
When a pair of high-only and low-only pilots are used
to obtain closer set points as specified by the set point
- P values in tables 2 and 3, connect the pilots as
MIN
shown in examples A and D in figure 2. For a two-seg-
ment flow line configuration that adheres to API Speci-
fication RP14C, connect as shown in example B or C.

Mounting

Normal installation is with the pilot mounted vertically
and with process, supply, and output connections fac-
ing downward as shown in figure 1. If the pilot was not
ordered as part of a control valve assembly, it can be
mounted in any of the following ways. All key numbers
are shown in figure 8 unless otherwise indicated.

Actuator Mounting

Pilots specified for mounting on a control valve actua-
tor are normally mounted at the factory. If the pilot is
ordered separately for installation on a control valve
actuator, mount the unit as described in the appropri-
ate portion of this section.
To yoke-mount the pilot to an actuator, attach the two-
holed side of the yoke mounting plate (key 75, not
shown) to the spring barrel of the actuator with cap
screws and lockwashers (keys 84 and 85, not shown).
Then attach the three-bossed side of the pilot case
(key 2) to the three-holed side of the yoke mounting
plate with the remaining cap screws and lock washers.
To mount the pilot to the diaphragm casing of an ac-
tuator, attach the two-holed side of the casing mount-
ing plate (key 75, not shown) to the diaphragm casing
of the actuator with the actuator cap screws and nuts.
Then attach the three-bossed side of the pilot case
(key 2) to the three-holed side of the casing mounting
plate with cap screws and lock washers (keys 84 and
85, not shown).
4

Panel Mounting

If the pilot is not already equipped with a panel mount-
ing plate (key 75), remove the cover screws (key 6),
the cover (key 4), and the screws (key 21).
For pilots without set point indication, loosen the set
screws and remove the knobs (key 67), the locking
disks (key 69), and the front plate (key 74). Insert the
panel mounting plate, and reattach the front plate, the
locking disks, the knobs, the cable assembly (key 12),
the screws, the cover, and the cover screws.
For pilots with set point indication, loosen the module
set screws, and remove the modules and the front
plate (key 74). Insert the panel mounting plate, and
reattach the front plate, the modules, the cable assem-
bly (key 12), the screws, the cover, and the cover
screws.
Choose the panel mounting style required to allow for
either front or rear removal of the pilot from the panel.
Cut a hole in the panel surface and drill mounting
screw holes using the dimensions shown in figure 3.
For either mounting style, the process,
output, and supply pressure fittings
may be attached to the pilot prior to
sliding the pilot into the cutout. Also,
when removing the pilot from the panel,
these fittings do not need to be de-
tached from the pilot.
Peel off the backing on the panel mount gasket. Apply
pressure to the gasket surface to adhere the gasket to
the face of the panel. Slide the pilot into the cutout
from the front or rear side of the panel and attach the
panel mounting plate to the panel.

Pipestand Mounting

Pipestand mounting parts are available to mount the
pilot to a 2-inch (nominal) horizontal or vertical pipe.
Attach the three-bossed side of the pilot case (key 2)
to the three-holed side of the pipestand mounting plate
(key 75, not shown) with cap screws and lock washers
(keys 84 and 85, not shown). Then attach two pipe
clamps (key 86, not shown) to the pipestand mounting
plate, and fasten the pilot to the pipe.

Pressure Connections

Standard pressure connections on the Type 4660 pilot
are 1/4-inch NPT female. Use 1/4 or 3/8-inch pipe or
tubing for process, output, and supply pressure piping.
The locations of pressure connections are shown in
figure 4. The vent location is shown in figure 8.
Note