Honeywell MP953D Instruction Manual

IB-52

Installation and Maintenance

REPAIR AND ADJUSTMENT PROCEDURES FOR HONEYWELL

MP-953B,

MP-953D,

OR MP-953F PNEUMATIC OPERATORS USED ON ARMSTRONG HUMIDIFIERS

This bulletin should be used by experienced personnel as a

guide to the repair and adjustment of Honeywell

MP-953B,

MP-953D,

or MP-953F pneumatic operators for Armstrong humidifiers.

Selection or installation of equipment should always be

accompanied by competent technical assistance. We encourage you

to contact Armstrong or its local representative if further

information is required.

WARNING:

BE SURE THAT STEAM SUPPLY VALVE FOR THE HUMIDIFIER IS

CT,OSED

BEFORE ATTEMPTING TO MAKE ANY REPAIRS TO THE

OPERATOR.

Maintenance procedures for the Honeywell pneumatic operator

include:

removing the operator from the bonnet, installing the

operator on the bonnet, replacing steam seals, changing operator

springs,

replacing the diaphragm, replacing the rolling seal, and

replacing the valve and seat.

REMOVING THE PNEUMATIC OPERATOR

Many repair procedures require that the operator be removed

from the bonnet assembly.

To remove the operator, perform

the following steps.

Refer to Figure 1 (see back cover) to

locate the parts by item numbers.

Turn oft steam to the humidifier.

Turn off the instrument air and disconnect the line

from the operator.

Loosen the two set screws (27) on both sides of tne

operator base (26).

Remove operator plug (35) from the

MP-953D,

or open the

access plate on the MP-953B or MP-953F.

Insert a screwdriver into the slot at the top of the

yoke assembly (36).

Hold the operator and turn

screwdriver

clockwise until the yoke assembly

disengages from the operator.

Lift the operator from the bonnet.

(See Figure 1 on back cover.)

““\

y-p

‘\

AND ADJUSTMENT PROCEDURES FOR HONEYWELL

MP-953B,

MP-953D,

OR MP-953F PNEUMATIC OPERATORS USED ON

ARNSTRONG

HUMIDIFIERS

II.

INSTALLING THE PNEUMATIC OPERATOR

After necessary repairs have been made, perform the

following steps to install the operator.

10.

Press down the valve stem (16) so

that the valve is

completely

closed.

_Stem

Adapter

If the stem nut (17) and stem

,Stem

Nut

adapter (17A) were not removed

3-i/2"*

--.__

---Stem

during repairs, check

the

adjustment shown

in Figure 2.

Adjust as required.

_Matinq

surface

If the stem nut (17) and stem

for

Operator

adapter (17A) were removed during

-Humidifier

repairs,

turn them onto the stem

and adjust as shown in Figure 2.

*With valve in closed position

Assemble the yoke assembly (36) and

Figure 2.

stem adapter (17A) in the following

manner.

Hold the bearing (36B) in the orientation shown in

Figure 1 (flat side down, depression up).

Slide

the bearing into the groove of the stem adapter

(17A).

Place the spring (36C) on top of the stem adapter

(17A)

and bearing

(36B) with the longer tabs

pointed downward toward the notches in the sides

of the bearing.

Slide the yoke (36A) over the spring

(36C),

bearing

(36B),

and stem adapter (17A) until the

short tabs of the spring snap into place on both

sides of the yoke.

Center the yoke over the stem

(16)

Place the operator over the yoke assembly (36) and

lower the operator onto the bonnet (15).

Hold the operator to prevent it from turning. Insert a

screwdriver into the slot in the top of the yoke (36)

and turn counterclockwise until the operator base (26)

contacts the mating surface of the bonnet (15).

Tighten

th.e

two set screws (27).

Load the stem by turning the yoke (36) clockwise until

the spring cup (28) is from

l/16

l/8

inch above the

operator base (26).

(Dimension

"A"

in Figure 1).

Install the operator plug (35) in the top of the

MP-

9530 or close the access plate on the top of the

MP-

953B or MP-953F.

Turn on the steam to the humidifier.

Connect the air line to the operator and turn on the

instrument air. Make any necessary adjustments.

REPRAIR AND ADJUSTMENT PRC%EDURES FOR HONEYWELL MP-953B, M%-95iD,

OR MP-953P PNEUMATIC OPERATORS USED ON ARMSTRONG HUHIDIFIERS

.---,

III.

REPLACING STEM SEALS

There are stem seals in the bonnet assembly to prevent steam

leaks around the stem. The following steps should be

followed if these seals need to be replaced.

10.

Remove the pneumatic operator in accordance with

Section I.

Remove the bonnet assembly (15) from the humidifier

cap.

Remove the yoke assembly

(36),

stem adapter

(17A),

and

stem nut (17) from the stem (16).

Remove the packing gland (18) from the bonnet (15).

Push down the valve stem

(16),

then press it back into

place.

Repeat if necessary to loosen the seals (20)

and spacer (19).

Remove the seals (20) and spacer (19).

With the stem (16) in the bonnet

(15),

place two new

seals (20) with the spacer (19) between them, onto the

stem.

The open end of BOTH seals (with spring showing)

should be toward the valve.

Carefully guide the seals into place in the bonnet

(15).

Slide the packing gland (18) over the stem and

turn it into the bonnet.

Tighten the packing gland

securely.

Turn the bonnet assembly (15) into the humidifier cap,

and tighten securely.

Install the pneumatic operator in accordance with

Section II.

IV.

CHANGING OPERATOR

SPRlNGS

10.

Remove

the pneumatic operator in accordance with

Section I.

Remove the six cover screws (31) from the operator

cover (33).

Lift the cover (33) from the frame (29).

Remove the hex nut (34) and washer (32) from the

support (24).

Remove the follower (38) and diaphragm (21) from the

frame (29).

Invert~the

operator and remove the screws (25) from the

base (26).

Remove the base (26).

Carefully remove the cup (28) and support (24) -- avoid

damaging the rolling seal (22).

Remove the old spring (30) and replace it with the new

one.

Insert the support (24) through the center of the cup

(28),

and place the support and cup into the operator

frame.

Attach the rolling seal

(22),

and press the

‘i/

support back into place.

.^____

-----

‘-

b&REPAIR

AND ADJUSTMENT PROCEDURES FOR HONEYWELL

MP-953B,

MP-953D,

OR MP-953F PNEUMATIC OPERATORS USED ON ARMSTRONG HUMIDIFIERS

11.

12.

13.

14.

15.

16.

Place the operator base (26)' onto the frame

(29),

and

secure it in place with screws (25).

Invert the operator back to its upright position.

Place the diaphragm (21) and follower (38) into the

frame (29).

Place the washer (32) around the top of the support

(24),

and turn on the nut (34). Tighten securely.

With outer edge of the diaphragm (21) in the groove of

the frame

(29),

place the cove-r (33) over the frame.

Align the screw holes.

Attach the cover with the cover screws (31). Tighten

securely.

Install the -pneumatic operator in accordance with

Section.11.

CHANGIN

THE ROLLING SEAL

replace a rolling seal, perform the following steps.

Remove the pneumatic operator in accordance with

Section I.

Perform Section IV (CHANGING OPERATOR SPRINGS) steps 2

through 8 to disassemble the operator.

With the operator in the upright position, remove the

three screws (23) and ring (39) that secure the rolling

seal (22).

Remove the rolling seal (22). Then separate the cup

(37) from the old seal.

Place the cup (37) into the new rolling seal.

Install

the new seal in the frame.

Secure the new rolling seal (22) in place with the ring

(39) and three screws (23). Tighten securely. Be sure

that the edge of the rolling seal is in the groove in

the frame.

Perform Section IV steps 10 through 15 to reassemble

the operator.

Be sure that the spring (30) is in

place.

Install the pneumatic operator in accordance with

Section II.

VI.

REPLACING THE HUMIDIFIER VALVE AND SEAT

To replace the humidifier valve and seat, perform the

following steps.

Remove the pneumatic operator in accordance with

Section I.

Remove the bonnet assembly (15) from the humidirier

cap.

‘h_

iii

b&REPAIR

AND ADJUSTMENT PROCEDURES FOR HONEYWELL MP-953B, MP-953D,

OR MP-953F PNEUMATIC OPERATORS USED ON ARMSTRONG HUMIDIFIERS

Using a socket wrench, remove the old valve seat (14

from the humidifier cap. Install a new valve seat in

its place.

Remove

the yoke assembly

(36),

from the stem (16).

Remove the old valve and stem assembly (16) from the

bonnet,

and replace with a new valve and stem assembly.

NOTE:

If the stem seals are worn, replace them by

performing Section III (REPLACING STEM SEALS), steps 4

through 8.

Install the bonnet assembly (15) in the humidifier cap,

and tighten securely.

Install the pneumatic operator in accordance with

Section II.

VII. CHANGING THE DIAPHRAGM

To replace the diaphragm, perform the following steps.

10.

11.

12.

Turn off the steam to the humidifier.

Turn off the instrument air to the operator.

NOTE:

Generally,

the diaphragm is replaced without

removing the operator from the

humidirier.

However,

there are times that the location of the humidifier

makes it more convenient to remove the operator to a

workbench for repair.

Remove the six cover screws (31) from the operator

cover (33).

Lift the cover (33) from the frame (29).

Remove the hex nut (34) and washer (32) from the

support (24).

[Do

not disturb the yoke assembly

(36).]

Remove the follower (38) and diaphragm (21) from the

frame (29).

Discard the old diaphragm (21) and lay a new one in its

place.

Place the follower (38) on the diaphragm. Then place

washer (32) around the top of the support

(24),

and

turn on the nut (34). Tighten securely.

With the outer edge of the diaphragm (21) in the groove

of the frame

(29),

place the cover (33) over the frame.

Align the screw holes.

Install and tighten the six cover screws (31).

Turn on the steam to the humidifier.

Turn on the instrument air to the operator.

NOTE:

THE FOLLOWING ADJUSTMENTS ARE NECESSARY ONLY FOR

THE GRADUTROL RELAY USED WITH THE MP-953B OPERATORS‘AND

WITH MP-953F PILOT POSITIONERS.

b&REPAIR

AND ADJUSTMENT PROCEDURES FOR HONEYWELL

MP-953B,

MP-953D,

MP-953F PNEUMATIC.OPERATORS USED ON ARMSTRONG HUMIDIFIERS

VIII.OPERATING RANGE AND START POINT

MP-953B (See Figure 3)

Using a wrench (Honeywell Part No.

301572A

supplied

with gradutrol), loosen the cover locking screw.

Unscrew the start point adjustment knob and make

adjustments according to the directions printed inside

IX.

the knob as follows:

Range adjustment

3 lb. range, all

screws backed

off

to friction stop.

5 lb. range, plated

(outer) screws

tightened.

Black

(inner) screws

backed-off to

friction stop.

10 lb.

range, all

screws tightened.

Start point adjustment

Tighten cover until

it bottoms.

Back off (one turn

max.) until desired

start point of

correct range scale

lines up with

indicator near

marking.

Tighten the cover locking screw until it engages

the relay housing. Do not overtighten.

OPERATING

Set

TART POINT

iDJUSTMENT

COVER RANGE ADJUSTMENT

,,r,nn

LOCKING

hlY”D

/SCREW

SCREWS

RANGE ADJUSTMENT

(BLANK)-

(3)

SCREWS

RELA; BODY

Fig. 3

Adjustment Points of

Gradutrol Relay.

START

RANGE AND START POINT

MP-953F PILOT POSITIONER

the start point on the positioner to the value

desired.

Each click of the start point knob adjusts

the start point

l/4

psi.

NOTE:

ON THE MP-953F PILOT POSITIONER, ONLY THE START

POINT IS ADJUSTABLE. THE SPRING RANGE IS NOT

ADJUSTABLE.

THE RANGE CAN ONLY BE CHANGED BY REPLACING

THE FEEDBACK SPRING.

Honeywell MP-953F operators (with positioners) come

standard with an 8

13 psi (black) main spring. This

soring

does

us&

mge.

The feedback spring, however,

maybe changed in order to

vary

the

spring range of the

operator.

It is available in 3

(See Chart 4)

,\-5,

or 10 lb. ranges.

Since the start point is adjustable,

full open point willbethe startpointplus the spring

range.

--T-

,$$

AREPAIR

AND ADJUSTMENT PROCEDURES FOR HONEYWELL MP-953B,

MP-953D,

MP-953P PNEUMATIC OPERATORS USED ON ARMSTRONG HUMIDIFIERS

Feedback springs are available in a kit containing:

Bias Spring

White feedback spring, operating range 3 psi

Bronze feedback spring, operating range 5 psi

Violet feedback spring, operating range 10 psi

To change the feedback spring:

Turn off the instrument air.

Remove the pilot positioner by removing the two

phillips

head screws and one cover screw.

Do not

remove the pneumatic tubing.

The feedback spring is located in the operator on

top of the main diaphragm. Remove the old

feedback spring.

Insert

the feedback spring that will give the

desired operating range.

Replace the bias spring

located on top of the operator.

Replace the pilot positioner.

Turn on the instrument air.

ADJUSTMENT CHECK

(MP-953B AND MP-953F MODELS ONLY)

Install guages in the main and pilot air lines.

Main air pressure should be

equal

to or more than top

of sequencing range:

13 psi is minimum main pressure

for device to function.

Slowly apply pilot pressure and note the pressure at

which valve stem travel starts. This pressure should

be within

3/4

psi for the B model

1 psi for the F

model) of the start point setting.

Slowly increase pilot pressure until valve stem travel

is complete.

This pressure should be within

3/4

psi

for the B model

(+lpsi

for the F model) of the start

point pressure plus the range setting.

Make fine adjustments, if necessary, with the start

point adjustment knob. CAUTION (B MODEL ONLY): Loosen

the cover locking screws before turning the start point

adjustment knob.

This manual suits for next models

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