Greenheck RL147 User Manual
DESCRIPTION
The RL 147 Positioning Relay is a compact pneumatic device
designed to provide positive positioning of a pneumatic valve
or damper actuator. The positioner provides supply air
pressure against the actuator diaphragm to initiate stem or
shaft movement. The actuator spring reverses the stem or
shaft movement.
FEATURES
•
Rapid response
•
Good repeatability
•
Adjustable start point pressure
•
Adjustable span
•
Low air consumption
Technical Instruction
Document Number 155-038
RL 147-2
May, 1996
RL 147 POSITIONING RELAY
Figure 1. The RL 147 Positioning Relay mounted on a
No. 6 Damper Actuator.
SPECIFICATIONS
Operating:
Ambient Temperature Range
Storage...................................... -20 to 160°F (-29 to 71°C)
Operation .......................................35 to 160°F (2 to 71°C)
Maximum Pilot Signal Pressure .....................30 psig (207 kPa)
Maximum Supply Air Pressure.......................60 psig (413 kPa)
Start Point Adjustment Range.................3-10 psig (21-69 kPa)
Operating Span Adjustment Range.........3-12 psig (21-83 kPa)
Response.................................1/10 psi Input change (0.7 kPa)
Air Capacity @ ∆P = 2 psi (14 kPa) ............ 410 scim (112ml/s)
Air Consumption............................................. 40 scim (11 ml/s)
Table 1. Product Numbers for Positioning Relay and Mounting Kits.
Description of Actuator Type Order Numbers Reference
No. 3 Damper Actuator For actuators manufactured after 1/1/93 147-2000 147-104 7
No. 4 Damper Actuator 147-2000 147-314 7
No. 6 Damper Actuator 147-2000 147-276 8
8" Valve Actuator
For Flowrite actuators manufactured after 3/1/96
For Model 3 Flowrite actuators manufactured between 3/1/93
and 1/1/96
For Models 1 and 2 Flowrite actuators. Also order spring arm
# 147-307 for use with VF 591 5” and 6” balanced valves
12” Valve Actuator
For Flowrite actuators manufactured after 1/1/96
For Flowrite actuators manufactured between 3/78 and 1/1/96 147-2000 147-311 11
For Super Flowrite and 12” Flowrite actuators manufactured
before 3/78
PRODUCT NUMBERS
SPECIFICATIONS, Continued
Physical:
Air Connections ........................................... 1/8" (3.2 mm) NPT
Body Materials ....................................................................Zinc
Cover.......................................................... Electro Plated Steel
Dimensions .................................................................Figure 14
Shipping Weight w/Kit........................................... 2 lb. (0.9 Kg)
Positioning Relay Mounting Kit Page
599-00426
Contains both relay and mounting kit
147-2000 147-333 8
147-2000 147-277 10
599-00423
Contains both relay and mounting kit
147-2000 147-279 10
Refer to Table 1
9
9
.
Landis & Gyr, Inc.
Technical Instruction Landis & Gyr, Inc.
RL 147-2 Page 2
APPLICATION
The Positioning Relay is recommended for damper actuator
and valve applications where rapid speed of response and/or
repeatability of stem position is needed to obtain good system
operation. It can be used to reduce the span of controlled
devices to permit sequencing. It can also be used to increase
the close-off force of a normally open actuator without
affecting its spring span. This happens because the positioner
uses full supply air pressure to position the actuator.
The spring range of the actuator does not effect the operation
of the positioner. Therefore, it is recommended that an
actuator with a high spring range, such as 8 to 13 psig (55 to
90 kPa), be selected. This combination has the high return
force of the actuator spring plus the high forward force
available from the positioner.
A positioning relay can be connected to handle up to four
identical No. 6 damper actuators or up to six identical No. 4
damper actuators provided the following conditions are met.
All actuators must operate the same damper, and no more
than 100 feet of 1/4” (6.4 mm) O.D. tube is used to connect
them. Remember all actuators connected this way must be
identical (i.e., same size, spring range, stroke, etc.).
The positioning relay is single acting and is primarily intended
for use on actuators with an integral spring to return the
actuator shaft to the normal position. Applications with a
double acting (spring-less) actuator require a reversing relay to
provide the additional control signal.
OPERATION
A rise in thermostat pressure will unbalance the lever
assembly. Refer to Figure 2. The shaft movement, through the
spring arm, increases tension on the feedback spring to bring
the lever assembly again into balance. A drop in thermostat
pressure will unbalance the lever assembly in the opposite
direction to exhaust air from the actuator until a new balance
position is reached.
The positioning relay start point is adjustable. The start point
adjustment nut shown in Figure 2 is used to set the start point
pressure. The span adjustment screw tab location on the
feedback arm and the feedback spring location on the spring
guide determine the span setting of the relay.
Figure 2. Operation Schematic.
RL 147 POSITIONING RELAY Technical Instruction
155-038 Page 3
Figure 3. Construction of the RL 147 Positioning Relay.
Item
1 147-255 Cover 1 Steel
2 – Plate 1 Zamac Die Casting
3 – Lever Assembly 1
4 – #8-32 Cover Screw 1 Steel
5 – Washer 1 Rubber
6 147-273 Pivot Screw 2 Stainless Steel
7 – #8-32 x 1/2 “ Lg. Dual Pt. Set Screw 1 Steel
8 – #8-32 Palnut 1 Steel
9 – Diaphragm Assembly 1
10 – Start Point Adjustment Nut 1 Brass
11 – Start Spring 1 Music Wire
12 – Supply Valve Seat 1 Brass
13 – Supply Valve Spring 1 Phosphor Bronze
14 – Ball Assembly 1 Stainless Steel
15 – Gasket 1 Fairprene
16 – Bleed Port 1 Brass
17 – Base 1 Zamac Die Casting
18 034-048 #6-32 x 5/8” Lg. Bind Hd Screw 2 Brass
19 147-297 Spring Guide 1 Steel
20 034-067K Span Adjustment Screw 1 Steel
21 – Feedback Arm 1 Steel
Replacement
Part No.
Description
No.
Req’d
Material
Technical Instruction Landis & Gyr, Inc.
RL 147-2 Page 4
For spans of 11 psig or 12 psig (76 or 83 kPa)
CALIBRATION
Complete calibration instructions are included with each
positioning relay.
1. Check that you have the correct feedback spring(s)
attached.
2. Identify the desired operating span and the start point
pressure.
NOTE: In some cases, the actuator stem travel or stoke
is not identical to the nominal value of the relay feedback
spring. Refer to Calculating the Span Setting on page 5
to determine the span setting on the feedback arm.
1. Move the span adjustment tab to the 10 setting on the
feedback arm. Follow steps 2 and 3 above.
2. Move the feedback spring one hole away from the
standard location for a span of 11 psig (76 kPa) and two
holes away from the standard spring location for a 12 psig
(83 kPa) span. Refer to Figure 4.
3. Follow steps 4 and 5 above.
Adjusting the Start Point. Refer to Figure 6.
The positioning relay can be adjusted to start actuator movement at pressures between 3 and 10 psig (21 and 69 kPa).
1. Remove the relay cover.
2. Attach tubing with a pressure gauge and squeeze bulb to
the "T" port. Supply air should be attached to the "S" port.
The "M" port should be attached tot he connector on the
actuator.
3. Using the squeeze bulb, apply pressure to the relay.
Watch the valve stem or actuator shaft to see when it
begins to move. Check your pressure gauge; this is your
start point pressure.
4. If this is not the desired start point pressure, turn the start
point adjustment nut (Figure 5) clockwise to increase the
start point pressure and counterclockwise to decrease the
pressure.
5. Repeat steps 3 and 4 until the stem or shaft begins to
move at the desired pressure.
Figure 4. Span Adjustment.
Shown at Span Setting 8.
Setting the Span. Refer to Figure 4.
The positioning relay operating span can be set for spans of
3 psig through 12 psig (21 kPa to 83 kPa).
For spans of 3 psig through 10 psig (21 to 69 kPa)
1. Check that the feedback spring is attached to the spring
guide in the hole across from the span adjustment screw.
This is identified as the standard location in Figure 4.
2. With a screwdriver, loosen the span adjustment screw.
Move the spring guide on the feedback arm until the span
adjustment tab is at the desired span setting reference
number.
NOTE: The line to the left of the number is the setting.
3. Tighten the span adjustment screw.
4. The feedback spring must be parallel to the actuator shaft
or valve stem. Use open end wrenches to loosen the hex
nuts holding the spring arm in position on the shaft or
stem. Align the feedback spring and tighten the hex nuts.
5. The feedback spring should have no slack or no stretch in
it. Adjust the wing nuts and adjustment nut, if necessary
Figure 5. Start Point Adjustment.
Adjusting the Span
1. Using the squeeze bulb, apply pressure to the relay. Note
the pressure at which the stem or shaft begins to move.
2. Continue to apply pressure until the stem or shaft
completes its full stroke. Note the pressure.
3. The difference between the two pressures is the span.
4. If the span is not the desired span, move the spring guide
to a higher reference number to increase the span or
lower number to decrease the span. Refer to Figure 4.
5. Repeat steps 1 through 4 until you get the desired span.
Loading...