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Johnson Controls AD-1252, Installation Instructions Manual

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Johnson Controls AD-1252 Installation Instructions Manual Download Page 22

AD-1252 Thermal Dispersion Probe Airflow Measuring System Installation Instructions

22

Factory Menu

The factory menu is used to calibrate the sensors. Do 
not adjust the sensors by using this menu, unless you 
are directed to do so by a factory representative or 
Johnson Controls field technical support. 

Repair Information

If the AD-1252 Thermal Dispersion Probe Airflow 
Measuring System fails to operate within its 
specifications, replace the unit. For a replacement 
AD-1252 System, contact the nearest 
Johnson Controls representative. 

Maintenance

Twice a year, scroll through the velocity and 
temperature values using UP and DOWN (Figure 12). 
Remove the thermal dispersion probes and clean the 
sensor nodes if readings vary from normal readings.

Note:

SuprClean™ Defluxer by MicroCare 

(MCC-SPR) can be used to clean the sensor nodes. 
You can find the product on the All-Spec Industries 
Web site located here: http://www.all-spec.com/
products/MCCSPR.html.

Annually inspect the thermal dispersion probe in 
unfiltered outside air, return air, or exhaust air 
applications to ensure that the thermal dispersion 
probe is free of excessive buildup of lint, dust, or other 
airborne particulates. 

To remove the electronic probes:

1.

When the sensors are cool, remove the cover from 
the DMPR-RA002 Electronic Controller and turn 
the power switch off.

2.

Unplug the shielded CAT5e cable from the RJ45 
connector on the end of the thermal dispersion 
probe.

3.

Remove the mounting screws from the mounting 
plates on both sides of the thermal dispersion 
probe. On the side with the RJ45 connector, 
remove the four Phillips screws securing the 
mounting plate.

4.

Remove the lock nut and the washer from the 
mounting stud.

5.

Slide the thermal dispersion probe out of the duct 
from the side with the RJ45 connector.

6.

Wipe down the thermal dispersion probe with a 
damp cloth. Ensure that the sensor is on the 
bottom side of the probe during cleaning so any 
moisture encountered in the cleaning process will 
drain out of the probe and sensor.

7.

Remove lint, dust, and other matter from the 
opening of the sensor shroud by blowing through 
the hole or using a soft bristle brush. Do not use 
high pressure air. Care must be taken not to bend 
the thermistors while cleaning. The leads of the 
thermistors are fragile and can break if bent.

8.

Replace the thermal dispersion probe assembly in 
the duct by reversing Step 3 through Step 7.

9.

When the sensors are dry, power on the unit.

Replacement Parts

See Table 8 for AD-1252 Thermal Dispersion Probe 
Airflow Measuring System replacement part 
information.

Table 8:  AD-1252 Replacement Parts

Code Number

Description

DMPR-KA001

Aluminum mounting brackets for mounting to an inlet of a damper

DMPR-KA002

Stainless steel mounting brackets for mounting to an inlet of a damper

DMPR-RA002

Controller

DMPR-RA021

10-foot shielded CAT5 cable

DMPR-RA022

20-foot shielded CAT5 cable

DMPR-RA023

30-foot shielded CAT5 cable

DMPR-RA024

40-foot shielded CAT5 cable

DMPR-RA025

50-foot shielded CAT5 cable

DMPR-RA026

15-foot shielded CAT5 cable

DMPR-RA027

25-foot shielded CAT5 cable

Summary of Contents for AD-1252

Page 1: ...les These limits are designed to provide reasonable protection against harmful interference when this equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is...

Page 2: ... technician should install this system To avoid unsatisfactory operation or damage to the product strictly follow the instructions provided and do not substitute parts Damage to the product resulting from not following the instructions or using unauthorized parts may be excluded from the manufacturer s warranty coverage ...

Page 3: ... 2 2 3 2 3 2 4 2 4 2 4 2 4 2 4 2 4 2 4 2 4 2 4 2 4 36 914 2 2 3 2 3 2 3 2 2 4 2 4 2 4 2 4 2 4 2 4 2 4 2 4 2 4 2 4 2 4 42 1 067 3 2 3 2 3 2 3 3 4 2 3 4 3 4 3 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 48 1 219 3 2 3 2 4 2 4 2 4 3 4 3 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 54 1 372 3 2 3 2 4 2 4 2 4 3 4 3 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 60 1 524 3 2 3 2 4 3 4 3 4 3 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 66 1 6...

Page 4: ... Configurations 90 45 60 60 FIG AD1252_3or4rd Table 2 Number of Probes Sensors per Probe for Round Duct Applications 1 Duct Diameter in No of Probes No of Sensors per Probe 12 2 2 18 2 2 24 2 2 36 2 4 42 2 4 48 3 4 60 4 4 72 4 4 96 3 4 120 4 4 1 The minimum diameter size is 12 inches for round duct applications Round duct applications smaller than 12 inches 304 mm use the same number of probes and...

Page 5: ...tions Duct Height in A Duct Width in B 12 18 24 36 42 48 60 72 96 120 12 2 2 2 2 1 3 1 3 3 2 3 2 4 2 4 2 4 2 4 2 18 2 2 1 3 1 3 3 2 3 2 4 2 2 4 2 4 2 4 24 2 2 2 3 3 2 3 2 4 2 2 4 2 4 2 4 36 2 4 3 3 3 3 4 3 2 4 2 4 2 4 42 2 4 3 3 4 4 4 4 4 4 4 4 48 3 4 4 4 4 4 4 4 4 4 60 4 4 4 4 4 4 4 4 72 4 4 4 4 4 4 96 4 4 4 4 120 4 4 Figure 5 Oval Duct Mounting Sensor Density Details ...

Page 6: ... The thermal dispersion probes may be installed in the vertical or horizontal plane of the duct Use vertical installation for fan discharge applications In vertical mount applications where moisture is possible mount the multiplexer on the top In horizontal mount applications mount the probes so that the plastic sensor shrouds are on the bottom of the probe to minimize moisture accumulation Accumu...

Page 7: ... mounting stud extends through the 2 in 50 mm holes in the opposite side of the duct 7 With the probes in place go to the other side of the duct plenum and install the mounting plates onto the studs With the stud centered in the 2 in 50 mm hole place the mounting bracket over the stud followed by the nut and washer Tighten the nut and washer against the mounting plate Do not over tighten Note Do n...

Page 8: ...b_dim Multiplexer End with RJ45 Connectors Mounting Stud End Figure 8 Probe with NEMA Type 4 Weathershield Note Box provided may appear different than the example above Figure 9 Probe with Standard Insertion Mounting Hardware Hoods Shown on Top for Illustrative Purposes Figure 10 Probe with Damper Stand off Mounting Bracket Figure 11 Probe with Internal Mounting Bracket ...

Page 9: ... a common transformer can result in lower than expected voltage at the device and higher than expected current draw when devices are connected a great distance from the power source Transformers for the DMPR RA002 Electronic Controller are not required to be isolated from other devices Isolation is only required to prevent electrical fluctuations due to intermittent high loads from causing problem...

Page 10: ...ielded cable end is connected to the controller 2 Move the electronic controller s power switch Figure 12 to the ON position 3 Use the LCD Contrast Adjustment screw Figure 12 to adjust the LCD contrast as desired Turn the screw clockwise to increase contrast Turn the screw counterclockwise to decrease contrast 4 Use the Options menu to configure the electronic controller for your application See F...

Page 11: ...controller Figure 12 RESET SETTINGS LCD ON OFF ERROR INDICATION TEST SIGNAL UNITS GAIN OFFSET ZERO CUTOFF DISPLAY VELOCITY OUTPUT FORMULA SCALE VELOCITY mA OUTPUT SIGNAL ADJUST mA OUTPUT FILTER VALUE AUTO RESET TEMP DISPLAY IMPORTANT To accept changes to any menu item press the ENTER button before pressing the ESC button to exit If you are using firmware version 8 4 or higher you return to the fac...

Page 12: ...u activates the error indication on the LCD screen When an error occurs the temperature appears as a lowercase letter f degrees Fahrenheit See Figure 17 Figure 15 Reset Settings Submenu RESET SETTINGS ARE YOU SURE YES FACTORY SETTINGS ARE YOU SURE NO LCD ON OFF LCD ON OFF UP SW3 DOWN SW4 ENTER SW5 ENTER SW5 ENTER SW5 fig sbmn_rst_sttngs RESET SETTINGS DISPLAY OFF LCD ON OFF DISPLAY ON UP SW3 DOWN ...

Page 13: ... 20 mA Press ENTER to accept the test output signal and turn the test signal ON See Figure 18 Note Connect the BAS wiring and verify the test signal at the BAS and automation scaling have been correctly configured If the test signal at the BAS does not produce expected results disconnect the BAS wiring and verify the test signal at the controller with a multimeter If the test signal at the control...

Page 14: ...d DOWN to scroll through the available units Press ENTER to select the desired unit If CFM or L S is selected the area is requested on the LCD screen Use UP and DOWN to adjust the area calculation Press ENTER to accept the area value See Figure 19 Figure 19 Units Submenu ENTER UNIT SYSTEM S I UNIT SYSTEM I U VELOCITY UNIT M S AREA VALUE 1 00 sq M AREA VALUE 1 00 sq ft VELOCITY UNIT FPM VELOCITY UN...

Page 15: ...SET sets Gain 1 Offset 0 and velocity units to FPM If the units displayed are for volume CFM and L S make sure that the area calculation is correct for each respective area where measurements are being taken 2 Record the flow rate displayed on the controller during the time that reference measurements are taken 3 Record reference measurements of the flow rate Make sure that the units FPM CFM M S a...

Page 16: ...hat the area calculated is correct for each area where measurements are being taken 8 Calculate the new gain for the controller 9 Calculate the offset for the controller 10 Enter the gain and the offset for the controller Note If the offset is greater than the zero cutoff adjust the zero cutoff to a value greater than the offset value to display zero during no flow conditions The Controller displa...

Page 17: ...Cutoff Submenu Versions 8 5 and later UP SW3 DOWN SW4 ENTER SW5 ENTER SW5 DISPLAY VELOCITY OUTPUT FORMULA ZERO CUTOFF FIG sbmn_zr_ctff_nwr CUTOFF VALUE 40 FPM Figure 25 Zero Cutoff Submenu Versions Prior to 8 5 UP SW3 DOWN SW4 ENTER SW5 ARE YOU SURE NO DISPLAY VELOCITY OUTPUT FORMULA ARE YOU SURE YES ZERO CUTOFF TEST SIGNAL ENTER SW5 ENTER SW5 FIG sbmn_zr_ctff Figure 26 Display Velocity Output For...

Page 18: ...ting If normal operation is interrupted when Auto Reset is OFF manually cycle power to the control to restore normal operation Temp Display This option submenu allows the user to disable the temperature display The default setting is ON When the temperature display is OFF the display only shows the air movement measurement See Figure 30 Troubleshooting During normal operation two LEDs illuminate a...

Page 19: ...r is closed Ensure that power and data cables are a sufficient distance from high voltage power sources and motors to prevent interference Conduit may be required Ensure that there are no kinks cuts or crimps in the shielded CAT5e cables Ensure there is no visible damage to the electronic controller Ensure that the thermistors are clean dry and free from debris The output of individual sensors is ...

Page 20: ... of the transmitter If more than one amber LED flashes at the same time the multiplexer circuit is not properly programmed If this problem occurs contact the factory The mA output has locked on a single value The mA OUTPUT CALIBRATION function did not exit properly 4 mA and 20 mA are set to 0 4 mA and 20 mA have less than a 500 FPM difference ESCAPE enters a zero value 1 Press ESC and ENTER at the...

Page 21: ...w increases VA decreases The output data varies and is not consistent The dampers are not sequenced properly Correct the sequence of operation The transmitter locks up and resetting the transmitter starts the operation RF interference from local high output transmitters ambulance police is at fault Shorten the CAT5e communications cable and if it is not shielded use shielded cable or place in a co...

Page 22: ...ve the mounting screws from the mounting plates on both sides of the thermal dispersion probe On the side with the RJ45 connector remove the four Phillips screws securing the mounting plate 4 Remove the lock nut and the washer from the mounting stud 5 Slide the thermal dispersion probe out of the duct from the side with the RJ45 connector 6 Wipe down the thermal dispersion probe with a damp cloth ...

Page 23: ...wer Consumption 4 probes with 4 sensors 65 VA 3 probes with 4 sensors 48 VA 2 probes with 4 sensors 35 VA 1 probe with 4 sensors 17 VA Transmitter Chassis 0 080 Aluminum Output Signals 4 to 20 mA standard 2 to 10 VDC requires 499 ohm resistor across output terminals Output Signal Adjustments Field adjustable offset gain Display 16x2 character LCD airflow temperature and diagnostics Velocity Requir...

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