Honeywell MO953, MP953B, MP953, MP953A, MP953D Service Data

GENERAL

DESCRIPTION

The MO953 and MP953 Pneumatic

(“Actuators”) are used with

V5011

and

Valve

V5013

Actuators

Valves and

can control older steam and water valves via adapters. The

M0953A-D
MP953A-D

Actuators are functionally identical to the

Actuators. Therefore, most of this sheet is

directed to the MP953 Actuators.

MP953A

positioning, and the

and B Actuators use a Gradutrol Relay for

MP953E

and

MP953F

Actuators use a
positive positioner. The relay and the positioner function in
essentially the same way. Positivepositionerretrofitkitsare
available for

MP953A

and B Actuators (see

ACCESSORIES).

APPLICATION

These Actuators operate the

and certain other coil, line, and zone valves that

Device Type Active Inactive Active Inactive In. (mm)

Direct

acting
with Gradutrol
Relay

-

-

A

-

-

V5011

and

V5013

Table 1.

MP953

A1087 A1004 A1210
Al095 A1012 Al228

All78 A1053
A1202 All86 A1061

Valves

MO953/MP953

I

MO953

-

Al 5 (127)

A2

-

-

A7
A8

-

I

I

proportionally control steam or hot and cold liquids in
HVAC systems.

SPECIFICATIONS

MODELS:

MP953A-Direct-acting with Gradutrol Relay
MP953B-Reverse-acting with Gradutrol Relay
MP953C-Direct-acting without positioner
MP953D-Reverse-acting without positioner
MP953E-Direct-acting with positive positioner
MP953F-Reverse-acting with positive positioner

MAXIMUM SAFE AIR PRESSURE

25 psi (172

See Table 1 for additional specifications.

Specifications.

Size in

13 (330)

kPa)

112

(13) 160 (71)

314 (19)

314

(19)

l-1/2

(38)

314

(19)

l-1/2

(38)

with Gradutrol

i

Cl067 I-

Cl075

I

-

-

Cl141

-

Cl158

Cl067 C3XH
Cl075

C3XK

-

C9XH

-

C9XK

1

8 (203)

5 (127)

314 (19)

l/2

(13)

103)

2-7 (14-48) No

8-l 2 (55-83)

3-91 75-5500

Table 1.

MO953hW53

Specifications (Continued).

MP953

Device Type

Direct acting
no Relay or
positioner

(Cant)

Direct acting

with positive
positioner

Reverse acting
with positive
wsitioner

*Diaphragm color indicates maximum temperature:

Black
Black with White Dot (Ethylene Propylene-250F

Active

1

-

-

Cl471 Cl125

I

Cl489 Cl133 Cl489

Cl554

Cl562

-

-

D1222
D1230
D1248

D1255

El301
El319
El327
El277
El285
El293
El368
El376
El384

Inactive

I

Cl166

Cl414

-

-

D1206 D1206t -

D1214

-

-

- -

-

-

El400

- -

El418

-

El427

El435

-

El443

F1119

-

FllOl

-

F1093

-

(Neoprenetl6OF

(71C)

Active

-

-

Cl471

D1214t -

D1222

-

-

-

I-

I-

-

-

-

(121C)

MO953

1

Inactive In (mm)

I

c9xL5

­C8XH

C8XL

Cl554
Cl562

-

-

-

-

-

-

-

-

-

!

I

I

I-

I-

Sh?In

(127)

8 (203)

13 (330)

-

­7-118

(181)

8 (203)

13 (330)

3 (330)

7

(180)

Travel
In (mm)

1n

(13)

314

(19)

l-l/2

(38)

314

(19)

l-112

(38)

1-K

(38)El392

in

250

(121) 3-7 (21-48)

160

(71) 3-7 (21-48)

160 (71)

8-12

(55-83)

4-l 1 (28-76)

8-12 (55-83)

1(28-76)

4-l

(55-83)

8-12
4-l 1

(28-76)

10 (69)
10 (69)

No

,

75-5500

OPERATION

In a direct-acting (n.o. valve) system, an increase in
control (branch/pilot) air pressure forces the Actuator
diaphragm and cup assembly downward, forcing the valve
stem down to proportionally close off the flow through the
valve (Fig. 1).

1

THERMOSTAT

POSITIONER

In a reverse-acting
control (branch/pilot) air pressure forces the Actuator
diaphragm and cup assembly upwards, forcing the valve
stem up to proportionally increase the flow through the
valve.

In Actuators without Gradutrol Relays or positive

positioners, branchline pressure is applied to the
diaphragm. In Actuators with Gradutrol Relays or positive
positioners, up to full main air pressure is applied to the
diaphragm to ensure the valve is positioned proportionally

to the pilot pressure (the branchline pressure output from

the controlling device).

(nc.

valve) system, an increase in

MAINTENANCE

EQUIPMENT NEEDED

-

Commercial cleaning solvent or degreaser

-

Pressure Gage 14003519 (0 to 30 psi [0 to 207

-

Wrench 301572A for

MP953A

and B

kPa])

Mius

Fig. 1. Typical Direct-Acting

OPERATIONAL CHECK

Vary the branchline (pilot) pressure through the
operational range of the Actuator in both directions. The
valve should open and close smoothly.

MP953

Operation.

2

VISUAL INSPECTION

Check

periodically

visible problems.

for leaks, loose fittings, and other

CLEANING

Clean the Actuator with a commercial cleaning solvent or

degreaser.

A

WARNING

Careless handling of solvents can cause permanent

respiratory or skin damage. Avoid prolonged exposure to

solvents.

A

ADJUSTMENTS

CHECK ADJUSTMENT ON

Install gages in the main and pilot air lines.
Main

air

pressure

should be greater than or equal to the
top of the sequencing range (span): 13 psi (90
the minimum main pressure for the device to function.
Slowly increase
which the valve stem begins to travel. This pressure
should be within
setting
pressure should be within +l psi (7
point.
Continue increasing the pilot pressure until the valve
stem stops traveling. This pressure should be the start
point pressure plus the range (span) setting.

of

pilot

kO.75

theMP953AandB‘ForMP953EandF, the

MP953A,

pressure and note

psi (5

kPa)

of the start point

kPa)

B, E, F

the

pressure at

of the start

75-5500

kPa)

is

SET OPERATING RANGE

MP953E,

F

MP953A,

B

1,2.Use Wrench 301572A to loosen the cover locking

screw (Fig. 2).
Unscrew the start point adjustment knob until thread
is disengaged. Remove knob.
a.

For 3 psi (21

kPa)

range, back all range adjustment

screws off to friction stop.

b.

For 5 psi (34

kPa)

range, back only the black range
adjustment screws to stop and tighten the outer,
cadmium-plated range adjustment screws.

c. For 10 psi (69

kPa)

range, tighten all range

adjustment screws.

RANGE ADJUSTMENT SCREWS

START POINT

ADJUSTMENT

RANGE
ADJUSTMENT
INSTRUCTIONS
SHOWN HERE

(BLANK) -

(3)

E ADJUSTMENT

M IUM

PLATED)

-

Change the operating range of

replacing the feedback spring with one for the

MP953E

desired

and F by

(see REPAIR).

ADJUST START POINT

MP953A, B

Reinstall

setpoint

knob.
Tighten knob by turning it until it is seated on relay
body (Fig.

2).

Loosen knob (maximum of one turn) until start point

of correct scale range lines up with start point
indicator.
Tighten knob locking screw until it engages relay
body. Do not overtighten.

MP953E, F

range

RELA‘i BODY

Fig. 2. Adjustment Points of

Gradutrol Relay.

M0953/MP953A

8817-I

and B

Set the start point on the positioner to the value shown on
the job drawings. Critical applications and feedback spring
changes mightrequire fine-tuning the
of the start point knob will adjust the start

start

point. Each click

point

0.25 psi (1.7

kPa).

75-5500

4

TROUBLESHOOTING

EQUIPMENT NEEDED

Troubleshooting procedures require Pressure Gage

14003519 (0 to 30 psi [O to 207

CHECK

IS SECURELY MOUNTED

kPa]).

THAT

ACTUATOR

STEM EU-lTON IS

AND

PROPERLY LATCHED

NO

f

PRESSURETO

DOES

A

SYMPTOMS AND CORRECTIVE
ACTION

Figures 3 and 4 show troubleshooting flowcharts.

LOOSEN

SETPOINT COVER. SLOWLY

TURN COVER SCALE TO

BELOWZERO START POINT.

POSiTlONER

RANGE VALUE

ADJUST POSITIONER

START POINT

MINIMUM VALUE

DIALTO

I

RECAUBRATE

POSITIONER START

POINT IF NECESSARY

NO

Y

REMOVE ANY FOREIGN

MATERIAL;

REPAIR

AND STEM; AND/OR

AND/OR

DISC, SEAT.

REPACK VALVE

Fig. 3. Troubleshooting Flowchart for

MP953A,

B, E, F (with

5

Gradutrol

Relay/Positioner).

IS SECURELY h4OUNTED

AND STEM

PROPERLY LATCHED

NO

6UlTON Is

I

ADEQUATE FOR

COMPLETE

S-EM MOVE

REMOVE ANY FOREIGN

MATERIAL; AND/OR
REPAIR DISC, SEAT,
AND STEM; AND/OR

REPACK VALVE

Fig. 4. Troubleshooting Flowchart for

MP953C,

REPLACE ACTUATOR

DIAPHRAGM AND/OR

SLEEVE

ACTUATOR IS OK.

RESTORE SYSTEM

TO SERVICE.

D (without Gradutrol Relay/Positioner).

75-5500