Johnson Controls C-9500 Manuel utilisateur

Pneumatic Control Manual 717.1

Comparators, Cumulators, and Relays Section

Product Bulletin C-9500

Issue Date 1285

Part No. 24-1233-18, Rev. B

Code No. LIT-7171445

C-9500

Two-Position Pilot Cumulator

The C-9500 Two-Position Pilot

Cumulator is designed to switch

its output from zero to full input

pressure at a preselected

pressure. It provides

two-position output from a

proportional input signal.

The C-9500 features an

adjustable set point and

differential. The set point is

adjustable from 4 to 20 PSIG

(28 to 140 kPa) and is factory set

at approximately 9 PSIG

(63 kPa); the differential is

adjustable from 1 to 7.5 PSI

(7 to 52.5 kPa) below the set

point and is factory set at

approximately 1 PSI (7 kPa).

When the input pressure is below

the set point, the output will be

zero. When the input reaches

the set point, the output will

switch and become equal to the

input. Beyond the set point, the

output pressure will increase at a

1 to 1 ratio with a rising input

pressure.

Operation

In a typical application (see

Fig. 2), the input of the C-9500 is

connected to a proportional

controller and the output is

connected directly to the valve

actuator. As the controller

output pressure increases, the

output of the C-9500 remains at

zero until the controller output

pressure reaches the set point

of the C-9500. At that pressure,

the C-9500 snaps open and the

input is delivered to the output,

closing the valve completely.

After the controller completes its

cycle, its output pressure

decreases and the output of the

C-9500 also decreases. As the

controller output pressure

reaches 8 PSIG (56 kPa), the

pilot chamber of the C-9500

snaps closed and the output

goes to zero, opening the valve.

Note: The signal to the

C-9500 must be a high volume

signal; a low volume signal or

a situation where the output

line is very long may cause

the C-9500 to cycle. This

device is specifically designed

for direct mounting on the

controlled device (as

described in the installation

section) to keep its output

working capacity at a

minimum.

Application and Drawing

Identification

Fig. 1: C-9500 Two-Position

Pilot Cumulator

Specifications

2 C-9500 Product Bulletin

Installation

The C-9500 is designed for

direct mounting to the actuator

(it is simply hand tightened on)

and features a 1/8 in. NPT

output connection and a 1/8 in.

NPT barbed fitting for 5/32 or

1/4 in. O.D. polytubing. Only

one actuator can be controlled

by each C-9500.

For applications where the

output from the C-9500 is

connected to a low capacity

device (for example a C-5226 or

a P-7100), the maximum line

length must not exceed the

following:

5 ft (152 cm) for 5/32 in.

O.D. polytubing

3 ft (91 cm) for 1/4 in. O.D.

polytubing

Calibration (See Fig. 3)

When making field adjustments,

the set point must be adjusted

before the differential. Changes

to the set point will affect the

differential; however, the

differential may be adjusted

without affecting the set point.

Set Point Adjustment

1. Remove the bottom cap

from the cumulator body.

2. Using a screwdriver, rotate

the spring adjusting screw

clockwise to decrease or

counterclockwise to increase

the set point. One full turn of

the screw in either direction

will provide approximately a

2 PSI (14 kPa) change in the

set point.

3. In order to check the set

point, the output must be

dead-ended. With the bottom

cap opening blocked and an

X-200-140 Hypodermic

Needle Test Probe (ordered

separately) inserted in the test

point, determine and reset the

C-9500 to the desired set

point. When the desired set

point is obtained, replace the

bottom cap.

C-9500 Product Bulletin 3

Differential Adjustment

1. Loosen the locknut.

2. Using a screwdriver, slowly

rotate the differential

adjusting screw clockwise to

increase or

counterclockwise to

decrease the differential.

Turn the screw

approximately 1/8 of a turn

at a time.

3. To check the differential,

observe the pressure on the

output gage for the point at

which the pressure drops to

zero. When the desired

differential is obtained,

retighten the locknut.

The maximum differential is

obtained by slowly turning the

screw clockwise into the body

until it stops, then backing it out

1/8 of a turn. Note: The screw

will stop because it contacts

the valve disc. Be careful not

to force the screw down onto

the disc. Refer to Fig. 4 for the

approximate maximum

differential pressures obtainable

for each respective set point.

Repair Information

If the C-9500 fails to operate

within its specifications, unit

replacement is required; field

repairs cannot be made.

Note: When checking or

replacing the C-9500, be sure

that the change in output

pressure will not upset the

system and cause damage (for

example allow a coil to freeze,

burn out a heater, collapse

duct work).

4 C-9500 Product Bulletin

Notes

Controls Group

507 E. Michigan Street

P.O. Box 423 Printed in U.S.A.

Milwaukee, WI 53202

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