t.a.c. CP-8551 Instruction manual

Printed in U.S.A. 8-08 ©Copyright 2008 TAC All Rights Reserved. F-26159-5
Application
The CP-8551 and CP-8552 transducers receive a
variable electronic input signal and produce a 3 to 15
psig(21to103kPa)pneumaticoutputsignaltoposition
pneumatic damper and valve actuators in HVAC
systems.
Features
•Durable enclosure with easily accessible wiring
terminations
•Panel or DIN rail mounting for quick, snap-on
installation
•Two-wire loop powered or three-wire voltage input
•High accuracy with low hysteresis
•Long-term driftless operation with high repeatability
•Low air consumption and large air flow capacity
•Control input protection from short circuit or reverse
polarity
Applicable Literature
•TAC Environmental Controls Reference Manual,
F-21683
•EN-123 Air Quality Requirements for Pneumatic
HVAC Control Systems Engineering Information,
F-22516
•TAC Pneumatic Products Catalog, F-27383
CP-8551 & CP-8552
Electronic to Pneumatic Transducers
General Instructions

2©Copyright 2008 TAC All Rights Reserved. F-26159-5
SPECIFICATIONS
Transducer Inputs
Input Signal:
CP-8551, 4 to 20 mA.
CP-8552, 4 to 20 mA, 6 to 9 V, and 0 to 10 V.
Input Impedance:
CP-8551, 550 ¾ maximum, 400 ¾ minimum.
CP-8552, 550 ¾ maximum, 400 ¾ minimum, 4 to 20 mA input; >10,000 ¾ voltage input.
Power Input Requirements:
4 to 20 mA Input, None.
0 to 10 and 6 to 9 V Input, Requires 20 to 30 Vac, 3.9 VA (CP-8552), 50/60 Hz, or 24
to 30 Vdc power supply, 1.6 watts maximum.
Input Range Selection:
CP-8551, None.
CP-8552, Jumper selectable.
Air Supply Required: 20 psig (138 kPa) nominal, 30 psig (207 kPa) maximum. Clean,
dry, oil free air required (refer to EN-123, F-22516).
Air Consumption for Sizing Air Compressor: Maximum 0.012 scfm (5.66 ml/s) @ 20
psig (138 kPa) supply.
Air Capacity for Sizing Air Mains: Minimum 550 scim (150.24 ml/s).
Air Connections: Male barbed fittings for flexible 1/4" O.D. pneumatic tubing.
Wiring Connections: Screw terminals for use with 16 to 22 AWG wire.
Transducer Outputs
Output Signal: 3 to 15 psig (21 to 103 kPa) nominal, Direct Acting.
Maximum Pneumatic Output: 1 to 18 psig (7 to 124 kPa).
Output Air Capacity & Pressure: 515 scim (141 ml/s) maximum with a 20 psig (138 kPa)
supply.
Operating Characteristics:
Linearity, ±1% of span @ 75°F (24° C).
Hysteresis, 0.75% of span @ 75°F (24° C).
Adjustments:
CP-8551, None.
CP-8552,
4 to 20 mA Range None.
0 to 10 and 6 to 9 V Range Adjustable start point and span potentiometers.
Environment
Ambient Temperature Limits:
Shipping and Storage, -40 to 160°F (-40 to 71° C).
Operating, 32 to 140°F (0 to 60° C).
Humidity: 5 to 95% R.H., non-condensing.
Locations: NEMA Type 1.
Agency Listings:
UL 873: Underwriters Laboratories (File #E9429 Category Temperature-Indicating and
Regulating Equipment).
CSA: Certified for use in Canada by Underwriters Laboratories. Canadian Standards
C22.2 No. 24-93.
European Community: EMC Directive (89/336/EEC). Low Voltage Directive
(72/23/EEC).
Accessories
AL-3X2 Pressure gauge.
K-335 In-line air filter.
B-371 Branch tee.
M-127 90° drop ear elbow.
M-636 4 in. T and B wire tie.
P-610 35 mm DIN rail (1-3/8 W x 36 L x 3/10 H in).
Note: Order the AL-3X2 Pressure Gauge, the B-371 Branch Tee, and the M-127 90°
Drop EarElbow separately andfield assemble to provide optional pressure indication for
the CP-8551 and CP-8552 transducers.

F-26159-5 ©Copyright 2008 TAC All Rights Reserved. 3
TYPICAL APPLICATIONS (wiring diagram)
Figure-1 CP-8551 Typical Wiring.
Figure-2 CP-8552 Typical Wiring for Voltage Input.
Figure-3 CP-8552 Typical Wiring for Current Input.
INSTALLATION
Inspection Inspect the package for damage. If damaged, notify the appropriate carrier immediately.
If undamaged, open the package and inspect the device for obvious damage. Return
damaged products.
Requirements •Wiring diagrams.
•Tools (not provided):
– Screwdriver for mounting screws.
– Drill and drill bit for mounting screws.
•Appropriate accessories.
•Two (2) # 6 mounting screws (not provided).
•M-636 4 in. T and B wire tie (not provided).
•Training: Installer must be a qualified, experienced technician.
CP-8551 M
B
M
3 to 15 psig
(21 to 103 kPa
to controlled device
(direct acting)
+
—
+4 to 20 mA Current Input Signal
Signal Common
CP-8552 M
B
M
3 to 15 psig
(21 to 103 kPa
to controlled device
(direct acting)
+IV1
Signal Common
Voltage Input Signal
Power Common COM
24 Vac/dc 24H
1
1When multiple CP-8552s or other devices are powered
by a common source, uniform wiring polarity must be
maintained between all 24H and COM terminals. Check
to ensure that the controller’s COM terminal is not
connected to any other ground reference.
1
2
3
CP-8552 M
B
M
3 to 15 psig
(21 to 103 kPa
to controlled device
(direct acting)
COM
+IV1
Signal Common
+4 to 20 mA Current Input Signal
1
2
3

4©Copyright 2008 TAC All Rights Reserved. F-26159-5
Precautions
General
Warning:
•Disconnect the power supply (line power) before installation to prevent possible
electrical shock and equipment damage.
•Make all connections in accordance with the wiring diagram and in accordance with
national and local electrical codes. Use copper conductors only.
•Do not exceed the ratings of the device(s).
Supply Air
Caution:
•Particles in the air supply larger than 0.03 microns (4 mPa) may adversely affect the
reliability and life of the transducer. If air supply is questionable, install a K-335 in line
air filter between the main air supply and the main air port of the device.
•A refrigerated air dryer, particulate filter, and coalescing filter should provide a quality
air supply (refer to EN-123, F-22516).
•Compressor oil must be non-paraffin mineral base or naphtha base. Synthetic base
oils will destroy pneumatic controls and void the warranty.
Location Caution:
•NEMA Type 1 devices are intended for indoor use primarily to provide a degree of
protection against contact with the enclosed equipment.
•Do not locate unit in areas subject to incidental contact, vibration, severe mechanical
shock, excessive moisture, or corrosive fumes.
Mounting Refer to Figure-5 for mounting dimensions.
Caution: The CP-8551 and CP-8552 transducers must be mounted within 5°of the
upright position. (Refer to "UP" arrow on printed circuit board.)
1. Remove transducer cover by grasping both sides of cover and pulling gently.
2. Select the mounting location.
3. Rail mount transducer on a vertical surface by snapping to a 35 mm DIN mounting rail
(not provided) or wall mount with two screws (not provided). Multiple units can be
mounted side by side on a DIN mounting rail.
4. Pull wires through bottom of enclosure and make necessary connections.
5. Position wires to clear the wiring access hole in the cover.
6. Use a small plastic wire tie to secure the wires to the strain relief tab provided on the
mounting base to the left of the wiring terminations (Figure-4 ).
7. Replace cover and make pneumatic connections.
Wiring Use 16 to 22 AWG wire for Class II wiring terminals. Use flexible 1/4" O.D. tubing for main
and branch male pneumatic connections.

F-26159-5 ©Copyright 2008 TAC All Rights Reserved. 5
Jumper Selection
(CP-8552 Only)
Note: The CP-8552 is factory calibrated for the 4 to 20 mA and 0 to 10 V ranges.Switching
to the 6 to 9 V range requires recalibration of the start point and span potentiometers.
The CP-8552 has three jumper selectable inputranges. Refer to Figure-4 for jumper block
detail. Make proper jumper selection as follows:
1. Choose input range.
2. Consult Table-1 for jumper position.
3. Place jumper over square posts on appropriate lettered block (Figure-4 ).
4. Calibrate by performing appropriate CHECKOUT procedure.
Table-1 CP-8552 Jumper Selection.
Figure-4 CP-8552 Internal View.
Range x = Insert jumper at position shown in chart.
ABC
4 to 20 mA X
6 to 9 V X
0 to 10 VaX
aCP-8552 factory supplied at 0 to 10 V input.
Wiring
terminations
Zero adjust
potentiometer
Jumper
Square
post
Jumper
block
Span adjust
potentiometer
Transducer
ABC
1
2
3
Start point
potentiometer

6©Copyright 2008 TAC All Rights Reserved. F-26159-5
Controller Output Scaling
In order to properly control the actuator, the output of the controller must be scaled
appropriately. Table-2 below illustrates the correct output which corresponds to the
electronic input of the transducer.
* Applies only to CP-8552.
CHECKOUT
4 to 20 mA Range
(CP-8551 and
CP-8552)
Note: The CP-8551 and CP-8552 4 to 20 mA span and start point potentiometers are not
field adjustable.
To check transducer operation:
1. Checkforforeignmaterialsuchasdirtoroilintheairsupply.Alsocheckforcloggedfilters.
Supply air contamination by dirt or oil is the most likely cause of malfunction.
2. Verify that the unit is mounted upright and wired correctly.
3. Verify that 20 psig (138 kPa) main air is present.
4. Verify with a digital multimeter that a 4 to 20 mAdc signal is present and of correct
polarity.
5. Adjust the input signal to 4 mA. Branch pressure should be 3 psig ± 1.0 (21 kPa).
6. Adjust the input signal to 20 mA. Branch pressure (direct acting) should be 15 psig
± 1.0 (103 kPa).
7. Unit is functional if correct pressures are indicated. Replace an inoperative transducer
with a functional unit.
Table-2 Electronic/Pneumatic Transducer Conversion Chart.
Electronic Input
Output
(PSI) 4-20 mA 6-9 Volts* 0-10 Volts*
34.00 6.00 0.00
45.33 6.25 0.83
56.67 6.50 1.67
68.00 6.75 2.50
79.33 7.00 3.33
810.67 7.25 4.17
912.00 7.50 5.00
10 13.33 7.75 5.83
11 14.67 8.00 6.67
12 16.00 8.25 7.50
13 17.33 8.50 8.33
14 18.67 8.75 9.17
15 20.00 9.00 10.00

F-26159-5 ©Copyright 2008 TAC All Rights Reserved. 7
0 to 10 or 6 to 9 V
Range (CP-8552 only) To check transducer operation:
1. Checkforforeignmaterialsuchasdirtoroilintheairsupply.Alsocheckforcloggedfilters.
Supply air contamination by dirt or oil is the most likely cause of malfunction.
2. Verify that the unit is mounted upright and wired correctly.
3. Verify that 24 Vac power is available and 20 psig (138 kPa) main air is present.
4. Verify with a digital voltmeter that an inputsignal between 0 to 10 or 6 to 9 V is present
and of correct polarity.
5. Use a digital voltmeter to verify the presence of the correct power supply voltage
between terminals 1 and 2.
6. Adjust the input signal to bottom of range (0 or 6 V).
7. Branch pressure should be 3 psig (21 kPa). If not, adjust start point potentiometer
(Figure-4 ) to obtain a 3 psig (21 kPa) output.
8. Adjust input to top of range (9 or 10 V).
9. Branch pressure should be 15 psig (103 kPa). If not, adjust SPAN potentiometer
(Figure-4 ) to obtain a 15 psig (103 kPa) output.
10. Recheck steps 6 through 9.
11. Unit is functional if correct pressures are indicated. Replace an inoperative transducer
with a functional unit.
MAINTENANCE
Regular maintenance of the total system is recommended to assure sustained optimum
performance.
FIELD REPAIR
Field repair is not recommended. Replace an inoperative transducer with a functional unit.
DIMENSIONAL DATA
Figure-5 CP-8551 and CP-8552 Dimensions.
Dimensions shown are in inches (mm).
4-5/8
(118) 4
(102)
2-1/4
(57)
2-13/16
(71)
9/16
(14)
2-3/4
(70)
5/16
(8)
Side View
Front View
2-5/32
(55)
1/2
(13)
1-21/32
(42)
4-1/4
(108)
1-3/32
(28)

Copyright 2008, TAC
All brand names, trademarks and registered
trademarks are the property of their respective
owners. Information contained within this
document is subject to change without notice.
F-26159-5
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TAC
1354 Clifford Avenue
P.O. Box 2940
Loves Park, IL 61132-2940