Johnson Controls Y20EBD Series Service manual

FANs 121, 125
Technical Bulletin
Issue Date 0493
© 1993 Johnson Controls, Inc. 1
Part No. 34-420-6, Rev. A
Code No. LIT-121775
lntroduction 3
•
Application Details 3
•
Glossary 4
Installation Procedures 5
•
Tools Needed 5
•
Kit Includes 5
•
Installation Overview 6
•
Configuration and Mounting 7
•
Actuator and Linkage 13
•
Travel Limits 16
Checkout Procedure 22
Replacement Parts 23
Y20EBD Valve Linkage
for M100 Motor Actuators

2 M Motor Actuators—Y20EBD Valve Linkage for M100 Motor Actuators

MMotor Actuators—Y20EBD Valve Linkage for M100 Motor Actuators 3
lntroduction
The Y20EBD Valve Linkage converts the rotary motion of an M100
Series Motor Actuator to a linear movement in order to operate several
types of valves.
A rack and pinion drive mechanism provides the linear movement. The
rack assembly contains a spring that, when compressed by over travel, will
maintain valve close off to rated values. The pinion gear may be reversed
for manual operation with a 3/8 inch socket drive extension for service of
controlled equipment.
Table 1: Selection Table--Actuators and Linkages
Linkage
Number Spring Return
Actuator
Non-spring
Return
Actuator
Valve Seating Load, lb (n)
Y20EBD-1 M130 M120 75 (334) Green
Y20EBD-2 --- M140 150 (607) Yellow
Y20EBD-3 --- M150 270 (1201) Red
Y20EBD-5 M110 --- 40 (178) Orange
Y20EBD-6 M130 M120 100 (449)
Note: The Y20EBD linkage kit can be used on Barber-Colman
1-1/2 to 2 inch valves. Use the grooved adapter bushing provided
with the linkage kit for V-90 Series and the mid-bracket position.
Larger Barber-Colman valves can mount onto the Y20EBD yoke
directly; however, adding locally purchased large washers under
the linkage bracket to prevent paint damage is recommended.
A selection of models are available to adapt M100 Motor Actuators to
several types of valves.
A Y20EBD-4 linkage is available to enable an M150 Motor Actuator to
operate S91 auxiliary switches for automatic heating/cooling changeover
applications. The Y20EBD-4 allows additional over travel after valve
close off for switch operation. See Y20 Series Linkage Kits Product
Bulletin for a complete description.
Y20EBA valve linkage kits are available to adapt the M100 Series
Actuators to valves made by other manufacturers. See Y20 Series Linkage
Kits Product Bulletin for more information.
Refer to the technical bulletin provided with the motor actuator for
information on wiring the motor actuator and related adjustments.
Application
Details

4 M Motor Actuators—Y20EBD Valve Linkage for M100 Motor Actuators
The following terminology is used in these instructions:
CW--Clockwise refers to the direction of rotation of the actuator shaft as
seen from the load end.
Zero Position--The fully counterclockwise position of the actuator
shaft--the de-energized position of a spring return actuator.
Stem Up--The initial position of the stem is up before operating the valve.
Stem Down--The initial position of the stem is down before operating the
valve.
Push/Drive Down to Open--Pushing or driving the stem down opens
the valve.
Push/Drive Down to Close--Pushing or driving the stem down closes
the valve.
Pull/Drive Up to Open--Pulling or driving the stem up opens the valve.
Pull/Drive Up to Close--Pulling or driving the stem up closes the valve.
Stem Up/Drive Down--The stem is initially in the up position and the
motor actuator through the linkage will drive the stem down.
Stem Down/Drive Up--The stem is initially in the down position and the
motor actuator through the linkage will drive the stem up.
Three Way Mixing Valve--A valve with two inlets and one outlet. Valve
seats on both stem up and stem down travel.
Three Way Diverting Valve--A valve with one inlet and two outlets.
Valve seats on both stem up and stem down travel.
Glossary

MMotor Actuators—Y20EBD Valve Linkage for M100 Motor Actuators 5
Installation Procedures
•screwdriver, small blade
•screwdriver, medium blade
•pliers
•wrench, adjustable, medium
•socket wrench, 3/8 inch drive
4
12
2/3
8
13
10
9
7
1
11
5/6
14
Y20D1-01
Item Description Quantity Item Description Quantity
1Mounting Bracket Assembly 1 8Washer (High Temp) 4
2Valve Bushing, 3/4 in. Not
Grooved 19Hex Nut, 1/4-20 4
3Valve Bushing, 1 in. Grooved 1 10 Valve Stem Connector 1
4Yoke Nut 1 11 Rack Subassembly 1
5Hex (Jam) Nut, 1/4-28 1 12 Gear Subassembly 1
6Hex (Jam) Nut, 3/8-20 1 13 Washer, Black 2
7Hex Cap Screw 4 14 Screw 2
Figure 1: Kit Components
Tools Needed
Kit Includes

6 M Motor Actuators—Y20EBD Valve Linkage for M100 Motor Actuators
Upright mounting of the motor actuator is recommended.
When valve mounting, do not mount below the horizontal plane of the
valve piping to prevent damage to the motor actuator if the valve leaks or
develops condensation.
Do not install the motor actuator in atmospheres with explosive vapors or
escaping gases, or where vapors having deteriorating properties might
attack the actuator’s metal parts.
Do not install where the ambient temperature of the surrounding area falls
below -40°F (-40°C) for non-spring return motor actuators, or
-35°F (-37°C) for spring return motor actuators. The maximum ambient
temperature of the surrounding area of the motor actuator should not
exceed 125°F (52°C).
Valve medium temperatures above 250°F (121°C) are permissible only if
the maximum ambient temperature at the motor actuator is less than 105°F
(41°C).
Use insulating washers furnished with the linkage kit for valve medium
temperature applications over 250°F (121°C).
Locate the motor actuator where the shaft and wiring terminals are
accessible.
The non-spring return M100 Actuator will hold its position if power is
removed. The spring return actuator will return to its zero position if
power is removed. Both types will hold their current position if the
control signal is satisfied.
Note: The spring return is intended only as a safety feature to drive the
actuator to its zero position in the event power is interrupted or
turned off.
There are three sections to the installation of the Y20EBD valve linkage
kit:
1. Configure and mount the yoke on the valve.
2. Mount the actuator and linkage assembly to the yoke and connect to
the valve.
3. Adjust the travel limits to actuate the over travel spring and seat the
valve.
Installation
Overview

MMotor Actuators—Y20EBD Valve Linkage for M100 Motor Actuators 7
The information obtained in the following steps will be used for the travel
adjustments later. The reason that these measurements are here is that it is
easier to take the measurements prior to installing the linkage and actuator
than after.
For valves with various lift requirements, the actuator will require a
change in travel by 15°for each additional 0.1 inch (2.54 mm) of lift
required.
To determine the lift required:
Valve Stem
Full Up
Valve Stem
Full Down
Figure 2: Stem Travel Measurement
1. Measure the valve stem length in the full down position as shown in
Figure 2.
2. Measure the valve stem length in the full up position as shown in
Figure 2.
3. Subtract the full down position from the full up position, this will
provide the valve lift.
4. Divide the valve lift by 0.1 inch.
5. Multiply the result by 15°.
6. Provide additional 15°rotation on 2-way valves and 30°additional
rotation on 3-way valves for over travel seating.
Note: Maximum actuator rotation is 270°, which allows up to 1.7 inches
lift on 2-way valves and 1.6 inches lift on 3-way valves.
Note: VT valves have only 5/16 inch lift which requires a reduction of
actuator travel by 25°from factory setting.
Record the value for use with the travel adjustments.
Configuration
and Mounting
Valve Lift

8 M Motor Actuators—Y20EBD Valve Linkage for M100 Motor Actuators
When configuring the yoke, two areas have to be considered:
•the distance the actuator will be from the valve (height)
•the direction of drive the actuator is going to provide to the valve
To determine the height:
Yoke
Mounting
Surface
Valve Stem
Full Up
Valve Stem
Full Up
Figure 3: Height Measurement
1. Raise the valve stem to its full up position.
2. Measure from the yoke mounting surface to the top of the stem.
Brackets
Yoke
High
Low
Medium
Y20A1-04
Figure 4: Linkage Bracket Positions
The linkage brackets can be mounted to the yoke in one of three positions:
low, medium, or high.
•Low position for stem lengths from 2 inches up to 3 inches
(50.8 to 76.2 mm) in full up position. Johnson brass valves up to
2 inch (50.8 mm) pipe size.
•Medium position for stem lengths from 3 inches to 4 inches
(76.2 to 101.6 mm) in full up position. Johnson iron valves from
2-1/2 inches (63.5 mm) pipe size and larger. V90BA valves up to
2 inch (50.8 mm) and V90CA valves up to 3 inch (76.2 mm) pipe
sizes.
Configuring Yoke
Height

MMotor Actuators—Y20EBD Valve Linkage for M100 Motor Actuators 9
•High position for stem lengths from 4 inches to 5-7/8 inches
(101.6 to 147.2 mm) in full up position. V90CA valves from 4 inch
through 6 inch (101.6 through 152.4 mm) pipe sizes.
LOAD ENDLOAD END
Y20A1-05
Figure 5: Long and Short Stem Valve Bodies
The left side of Figure 5 shows a Y20EBD Valve Linkage in the high
position connecting a 3-way valve body with a long stem to a M100 Motor
Actuator for stem up operation.
The right side of Figure 5 shows a Y20EBD Valve Linkage in the low
position connecting a 2-way valve body with a short stem to a M100
Motor Actuator for stem up operation.
Except for M100C (reverse acting) and M100H models, with an increasing
signal, the actuator always operates Clockwise (CW) from its zero
mechanical position. This clockwise rotation can be used to drive the
valve stem up or down, depending on the way the gear housing is attached
to the actuator.
To determine the direction of actuator drive:
LOAD END
Directionof
Drive Rotation
Y20D1-06
Figure 6: Motor Actuator and Valve
Direction

10 M Motor Actuators—Y20EBD Valve Linkage for M100 Motor Actuators
1. With the motor actuator next to the valve, view the motor actuator
from the load end.
2. Determine the type of valve being used and the direction that will be
required to drive the stem from its initial position.
•Stem Up Two Way Valve--Drive Down to Close
•Stem Up Two Way Valve--Drive Down to Open
•Stem Down Two Way Valve--Drive Up to Open
•Stem Down Two Way Valve--Drive Up to Close
•Stem Up Three Way Valve
•Stem Down Three Way Valve
Load End Load End
Y20A1-07
Figure 7: Stem Up/Drive Down and Stem Down/Drive Up
3. For valves with the stem in the initial up position, the hole in the yoke
will be to the right of center when facing the load end as shown in the
left illustration of Figure 7.
For valves with the stem in the initial down position, the hole in the
yoke will be to the left of center when facing the load end as shown in
the right illustration of Figure 7.
The brackets are assembled at the factory in the low position and for stem
up/drive down valve application with the hole in the yoke to the right of
center as shown in the left illustration of Figure 7.
For any other application, the yoke and brackets must be disassembled and
reassembled for the specific application as described below.
Screw
Left Side
Bracket Right Side Bracket
Nut
Washer/
Yoke
Y20D1-O8
Figure 8: Bracket Components
Changing Yoke