112 Auxiliary Potentiometers

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INSTALLATION. When Installing this Product... 1. Read these instructions carefully. Failure to follow them could result in the equipment not operating properly. 2. Check the part numbers in Table 1 to be sure that the product is suitable for your application. 3. The installer must be a trained, experienced service technician. 4.

43191679-111/-112 Auxiliary Potentiometers INSTALLATION INSTRUCTIONS

APPLICATION

INSTALLATION

The 43191679-111/-112 Auxiliary Potentiometers can be used as feedback potentiometers and to provide remote indication of the valve position. They are used with valve actuators as shown in Table 1. Fig. 1 illustrates the parts furnished with these potentiometers.

When Installing this Product...

Table 1. Auxiliary Potentiometers. Actuator

Single 10K Ohm Potentiometer

Single 220 Ohm Potentiometera

ML6425A,B

43191679-111

43191679-112

1. Read these instructions carefully. Failure to follow them could result in the equipment not operating properly. 2. Check the part numbers in Table 1 to be sure that the product is suitable for your application. 3. The installer must be a trained, experienced service technician. 4. After completing installation, use these instructions to check product operation.

CAUTION

ML7425A,B a Over nominal stroke (3/4 in.), usable potentiometer range is 135 ohms.

Disconnect the power supply to the auxiliary potentiometer and actuator before beginning installation to prevent electrical shock or equipment damage.

Mounting, Connecting, and Adjusting 1 Remove actuator cover.

2 Turn potentiometer shaft fully clockwise. See Fig. 2. a

b T Y G

d C8372

T

Y

G

Fig. 1. Auxiliary Potentiometer Parts.

c

C8373

Fig. 2. Installing potentiometer, terminal label, and connector block.

Copyright © 1997 Honeywell Inc. • All Rights Reserved

X-XX UL

63-2522

43191679-111/-112 AUXILIARY POTENTIOMETERS

3 Remove manual spring handle retaining clip and lift and release the handle. See Fig. 3. The easiest way to perform this operation safely is to: a. Remove the retaining clip (shipping stop). b. Wedge a small, flat-bladed screwdriver under the manual spring handle at the point marked in Fig. 3 and pry up the handle.

CAUTION

100

The manual spring handle is under tension and could turn quickly when lifted resulting in injury to fingers pinched between the handle and plastic casing. Maintain handle orientation while lifting and remove fingers quickly when releasing.

0

0

100

C8374

Fig. 4. Manually checking that handle is fully counterclockwise and valve stem is fully retracted (up). 5 Secure potentiometer, terminal label, and terminal block with Phillips head screwdriver. See Fig. 5.

4MM 3MM

Fig. 3. Removing spring retaining clip and releasing manual spring handle. a.

b.

G

4

ML6425A/ML7425A: After the handle is released, valve stem will be fully extended. Turn handle fully counterclockwise until valve stem is fully retracted (up). Secure the manual spring handle in valve stem-up position by pushing down handle and installing key in grove. See Figure 4.

Y

M6629

C8375

Fig. 5. Securing potentiometer, terminal label, and connector block. 6 Route potentiometer wires to terminal block and connect to terminals using a flat bladed screwdriver. See Fig. 5, 6, and 7.

ML6425B/ML7425B: After the handle is released, the handle turns automatically to the valve stem fully retracted (up) position.

G ML6425A/ML7425A only: Wedge a small, flat-bladed screwdriver under the manual spring handle at the point marked in Fig. 3 and pry up the handle. The manual spring handle will turn quickly, operating the valve stem to the fully extended position.

CAUTION

The manual spring handle is under tension and could turn quickly when lifted resulting in injury to fingers pinched between the handle and plastic casing. Maintain handle orientation while lifting and remove fingers quickly when releasing.

63-2522

2

43191679-111/-112 AUXILIARY POTENTIOMETERS

C8378

Fig. 6. Routing potentiometer wires to terminal block and connecting to terminals. All wiring must comply with local codes, regulations, and ordinances. VIOLET

BROWN

ORANGE

PI

T T

Y

Y

G

T

Y

G

G C8377

Fig. 7. Internal wiring for potentiometer.

C8376

Fig. 8. Field wiring for potentiometer.

Wiring Route field wiring in through the conduit opening in the bottom of the actuator, connect to the potentiometer terminal block according to the job drawings, and replace the actuator cover. See Fig. 8.

CHECKOUT Drive actuator shaft fully up and fully down and check the operation of the auxiliary potentiometer, e. g., feedback in the control system or remote indication of the valve position.

NOTE: When reversing the direction of the actuator, reverse the wires to Terminals Y and G.

CAUTION

Disconnect the power supply to the auxiliary potentiometer and actuator before wiring to prevent electrical shock or equipment damage.

3

63-2522

43191679-111/-112 AUXILIARY POTENTIOMETERS

Home and Building Control Honeywell Inc. Honeywell Plaza P.O. Box 524 Minneapolis, MN 55408-0524 63-2522 G.C. 1-97 Printed in U.S.A

Home and Building Control Honeywell Limited-Honeywell Limitée 155 Gordon Baker Road North York, Ontario M2H 2C9 4

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