Johnson Controls A350A/B Data Sheet

FANs 930, 930.5, 125, 121 Product/Technical Bulletin A350 Issue Date 0614
System 350™
A350A/B Electronic Temperature Control
The A350A/B Series is an on/off electronic temperature control with a Single-Pole, Double-Throw (SPDT) relay output and a Light-Emitting Diode (LED) relay status indicator. Designed to operate with both heating and cooling equipment, this control includes an adjustable differential and an interchangeable temperature sensor.
As are all System 350™ products, the A350A/B is housed in a NEMA 1, high-impact plastic enclosure. The modular design provides easy, plug-together connections for quick installation and future expandability.
Figure 1: A350 Series Electronic
Temperature Control
Features and Benefits
Modular Design Enables stage, display, and power modules to
be purchased and installed as needed
Plug-together Connectors
and 35 mm DIN Rail Mounting
Two Standard Models
Cover Wide Setpoint Ranges
-30 to 130°F (-34 to 55°C) or 90 to 250°F (32 to 121°C)
Wide Adjustable Differential
of 1 to 30F° (0.6 to 16.7C°)
Field-Selectable Mode
Jumpers
Available with Either
External or Concealed Setpoint
Eliminates wiring between modules and reduces installation costs
Reduces inventory by encompassing temperature ranges required to support the majority of Heating, Ventilation, Air Conditioning, and Refrigeration (HVAC/R) applications
Enables the user to match equipment cycle rate and/or sequencing for a given application
Operates in both heating and cooling applications
Helps deter accidental and unauthorized adjustments
Interchangeable
Temperature Sensors
© 2014 Johnson Controls, Inc. 1 Part No. 24-7664-44, Rev. D www.johnsoncontrols.com Code No. LIT-930010
Increases versatility and serviceability
pplication
A
The A350A/B Temperature Control can be used as a standalone device or in conjunction with other System 350 plug-together modules to control single or multiple-stage HVAC or refrigeration equipment. Typical applications include:
frozen/refrigerated food cases cooling tower control beverage/milk coolers chiller staging space temperature control
A typical System 350 Temperature Control arrangement includes the following:
A350A/B Temperature Control S350 Stage Modules D350 Digital Temperature Sensor/Setpoint Display
Module
Y350R Power Module (or Class 2
24 VAC transformer)
A99B Series Temperature Sensor
IMPORTANT: Use this A350A/B Electronic
Temperature Control only as an operating control. Where failure or malfunction of the A350A/B control could lead to personal injury or property damage to the controlled equipment or other property, additional precautions must be designed into the control system. Incorporate and maintain other devices, such as supervisory or alarm systems or safety or limit controls, intended to warn of or protect against failure or malfunction of the A350A/B control.
IMPORTANT: Utiliser ce A350A/B Electronic
Temperature Control uniquement en tant que dispositif de régulation. Lorsqu'une défaillance ou un dysfonctionnement du A350A/B control risque de provoquer des blessures ou d'endommager l'équipement contrôlé ou un autre équipement, la conception du système de contrôle doit intégrer des dispositifs de protection supplémentaires. Veiller dans ce cas à intégrer de façon permanente d'autres dispositifs, tels que des systèmes de supervision ou d'alarme, ou des dispositifs de sécurité ou de limitation, ayant une fonction d'avertissement ou de protection en cas de défaillance ou de dysfonctionnement du A350A/B control.
2 System 350 A350A/B Electronic Temperature Control Product/Technical Bulletin
peration
O
The A350A/B Temperature Control operates on 24 VAC and provides an SPDT relay output. A front panel LED lights to indicate when the relay is energized. Adjustable features include:
Setpoint Adjustment
Setpoint is defined as the temperature at which the A350A/B’s relay de-energizes. Use the Setpoint Dial on the front of the A350A/B to adjust setpoint. See Figure 2.
setpoint differential heating/cooling mode
IMPORTANT: All System 350 Controls are
designed for use only as operating controls. Where an operating control failure would result in personal injury and/or loss of property, it is the responsibility of the installer to add devices (safety, limit controls) that protect against, or systems (alarm, supervisory systems) that warn of, control failure.
Differential Adjustment
Differential is defined as the change in sensor temperature between energization and de­energization of the relay. Adjustment of the A350A/B differential is made using the potentiometer marked DIFF. See Figure 2 for its location. Refer to Table 5 for adjustment ranges.
24V COM VDC
SEN
DIFF
(Differential
Potentiometer)
Relay
LED Indicator
Figure 2: A350A/B Board Layout and
Setpoint
Dial
Module
Connector
Jumper Bl ock
Relay
NC
NO
Terminal Locations
Position
Heating
Cooling
Heating/Cooling Mode Adjustment
With Heating mode selected, the differential is below setpoint. The relay and LED indicator will de-energize as the temperature rises to the setpoint. As the temperature drops to the setpoint minus the differential setting, the relay will energize and the LED illuminates. Refer to Figure 6.
With Cooling mode selected, the differential is above setpoint. The relay and LED indicator will de-energize as the temperature drops to setpoint. As the temperature rises to the setpoint plus differential setting, the relay will energize and the LED illuminates.
As shipped from the factory, the heating/cooling jumper blocks are installed in the horizontal (cooling) position. See Figure 2.
System 350 A350A/B Electronic Temperature Control Product/Technical Bulletin 3
dd-On Modules
A
The S350 Stage Modules, D350 Digital Temperature Display Module, and Y350R Power Module connect together and plug into the A350 via a connector on its right side. The maximum number of add-on modules is listed in Table 1.
Table 1: Maximum Number of S350 Stage Modules per A350A/A350B
S350C Slave Stage Modules
S350C Slave Stage Modules receive power and sensor input from the A350 control. S350C Slave Stage Modules perform switching functions based upon the A350’s sensor information. (Setpoint and differential are selected independently at the S350C.)
For more information on these modules, refer to the
System 350 Module Product/Technical Bulletin (LIT-930084).
TM
S350C Temperature Slave Stage
Power Source
Y350R External
Class 2 Transformer
Note: For each S350P added, the number of S350A
or S350C Stage Modules that can be used with a Y350R decreases by two. If an external transformer is used, the number of S350A and S350C Stage Modules used decreases by one for each additional S350P.
Number of S350A or S350C
Modules
Allowed
9 6 4 9 8 7
Number of S350A or S350C
Modules
(with
1 S350P)
Allowed
Number of S350A or S350C
Modules
(with
2 S350P)
Allowed
S350A On-Off Stage Modules
S350A On-Off Stage Modules receive power, setpoint, and sensor input from the A350 control. S350A Stage Modules perform switching functions based upon the A350’s setpoint and sensor information, with the offset and differential selected at the S350A.
For more information on these modules, refer to the
System 350 S350 Temperature, S351 Humidity, and S352 Pressure On/Off Stage Modules Product/Technical Bulletin (LIT-930080).
S350P Proportional Stage Modules
S350P Proportional Stage Modules receive power, setpoint, and sensor input from the A350 control. The S350P responds with an analog 0-10 VDC and 0-20 mA output signal. This is based upon the A350’s setpoint and sensor information, with the offset, throttling range, and minimum output selected at the S350P.
For more information on these modules, refer to the
System 350 Temperature Stage Module Product/Technical Bulletin (LIT-930086).
TM
S350P Proportional Plus Integral
D350 Temperature Sensor/Setpoint Display Module
The D350 receives power, sensor, and setpoint information from the A350. A 3-digit Liquid Crystal Diode (LCD) gives continuous read-out of the sensed temperature. Pushing the PRESS FOR SETPOINT button on the front of the D350 causes the setpoint of the adjoining A350 to be displayed.
Y350R Power Module
The Y350R provides a convenient method of powering System 350 modules from a 120 or 240 VAC power source. The Y350R supplies power to the modules. See Figure 5 for a typical wiring diagram where a Y350R is used to power the A350.
For more information on this module, refer to
System 350 Product/Technical Bulletin (LIT-930090).
TM
Y350R Power Module
4 System 350 A350A/B Electronic Temperature Control Product/Technical Bulletin
imensions
D
Mounting Slots
for No. 6 Screws
3/16 (4)
1/2 (13)
2 15/16
(75)
5 (127)
4 (102)
9 3/4 (248)
1 9/16
(40)
Sensor
7/16 (11)
DIN Rail
Mount
3 (76)
1/4 (6)
Figure 3: A350A/B Control Dimensions, in. (mm)
2 3/8 (61)
7/8
(22)
2 3/8 (61)
1 3/16 (31)
Conduit
Hole
7/8
(22)
System 350 A350A/B Electronic Temperature Control Product/Technical Bulletin 5
nstallation and Wiring
I
The A350A/B Temperature Control is housed in a compact NEMA 1 plastic enclosure designed for standard 35 mm DIN rail mounting. The A350A/B is not position sensitive but should be mounted for convenient wiring and adjustment. Four key-slot mounting holes on the back of the control case are provided for surface mounting. Add-on modules must plug into the right side of the A350A/B control.
Note: When mounting the System 350 modules to rigid
conduit, attach the hub to the conduit before securing the hub to the control enclosure.
!
WARNING: Risk of Electric Shock.
Disconnect the power supply
before making electrical connections. Contact with components carrying hazardous voltage can cause electric shock and may result in severe personal injury or death.
AVERTISSEMENT:Risque de décharge
électrique.
Débrancher l'alimentation avant
de réaliser tout branchement électrique. Tout contact avec des composants porteurs de tensions dangereuses risque d'entraîner une décharge électrique et de provoquer des blessures graves, voire mortelles.
Sensor
Note: If sensor is mounted less than 50 ft (15.2 m) from the A350A/B, shielded cable is not required.
A350A/B
L
1 2
24 VAC
24V
COM
VDC SEN
L
1 2
Load
S350A
Load
D350
Figure 4: Typical Wiring Diagram for A350A/B
Powered by an External 10 VA Transformer
Sensor Connection
Shielded cable is not generally required for sensor wiring on runs of less than 50 ft (15.2 m), but is recommended for lengths greater than 50 ft (15.2 m). When using shielded cable, isolate and tape the shield at the sensor. Connect the shield to the COM sensor terminal on the A350A/B. (See Figure 2 for terminal location.) The A99BA-200C sensor, which includes shielded cable, is available if needed.
Note: At the maximum cable lengths listed in Table 2,
no more than 1F° (0.6C°) error in the sensed temperature will result due to wire resistance.
All wiring must conform to the National Electrical
Code and/or local regulations.
Note: For maximum electrical rating of control, see
label inside the control cover or Specifications section. Use copper conductors only.
Consult the typical wiring diagrams (Figures 4 and 5)
for proper wiring and terminal designations.
Table 2: Recommended Maximum Sensor Cable Lengths
Wire
Gauge
14 AWG 16 AWG 18 AWG 20 AWG 22 AWG
* Values provided are for 2-wire stranded cable.
Shielded Cable Length
Feet Meters
800 244 500 152 310 94 200 61 124 38
6 System 350 A350A/B Electronic Temperature Control Product/Technical Bulletin
*
Various A99B Series Temperature Sensors
and mounting hardware are available for use with A350 Series Controls. See Tables 3 and
6. The sensor must be connected to the COM and SEN terminals on the four-position terminal strip located at the top left of the printed circuit board (Refer to Figures 2, 4, and 5.). The sensors are not polarity sensitive.
The sensor must be mounted so that it can
accurately sense the temperature of the controlled medium.
Table 3: Sensors Included With A350A/B Controls
Control Sensor Included
Sensor lead length is 9-3/4 in. (0.25 m)
A350AA-1C
A350AA-2C
A350AA-3C
A350AB-1C A350AB-2C A350AB-5C A350BA-1C
A350BA-2C
A350BB-1C
A99BB-25C; Range: -40 to 212°F (-40 to 100°C)
A99BC-25C; Range: -40 to 248°F (-40 to 120°C)
A99BB-25C; Range: -40 to 212°F (-40 to 100°C)
No Sensor Included No Sensor Included No Sensor Included A99BB-25C; Range: -40 to 212°F
(-40 to 100°C) A99BC-25; Range: -40 to 248°F
(-40 to 120°C) No Sensor Included
For more information regarding sensor options
and installation, refer to the A99B Series Temperature Sensors Product/Technical Bulletin (LIT-125186).
120 VAC
Shield (Connect to COM on A350 )
A350A/B
Load Load Load Load
Y350R
S350A
S350A
Figure 5: System 350 Powered by Y350R Module
Sensor
D350S350A
System 350 A350A/B Electronic Temperature Control Product/Technical Bulletin 7
djustments
A
Follow this procedure to set up the A350A/B for the desired operation.
1. Remove the A350 cover by loosening the four captive cover screws.
2. Set the heating/cooling jumper blocks to the desired mode of operation. Position the jumper blocks vertically for heating or horizontally for cooling. (See Figure 2.)
IMPORTANT: Verify that the heating/cooling
jumper blocks are in the proper position before powering the System 350 modules. If the jumper blocks on the control or staging modules are installed in the wrong position, the device will activate the relay in response to the opposite signal. The heating or cooling equipment will remain energized until the error is corrected.
3. Adjust the differential potentiometer (DIFF) on the A350 as needed. (Figure 6 is an example of a multistage application.) The stage module’s offset and differential can be set independently.
(+)
Setpoint
Temperature
(-)
ON
Differential
OFF
ON = Energized
OFF= De-energized
A350
Stage 1
ON
Differential
OFF
OFFSET
OFF
S350A
Stage 2
Stage 3
Jumper Set T o
OFFSET
ON
S350A
Differential
S350A
Stage 4
HeatingCooling
OFFSET
OFF
Differential
ON
OFFSET
OFF
S350A
Stage 5
Differential
ON
Figure 6: Typical Multistage
Heating/Cooling Application
4. Replace the cover, and secure in place with the four captive screws. Move the setpoint dial to the desired position.
Note: The A350A/B setpoint is factory calibrated at
midscale to a tolerance of +/- 1F° (0.6C°). Setpoint tolerance at the extreme ends of the setpoint ranges in relation to the printed scale can be +/- 3F° (1.7C°). The D350 Display Module is unaffected by this tolerance shift. Use the D350 for the most accurate setpoint selection.
heckout Procedure
C
Follow this procedure to verify that the A350A/B is connected and functioning properly.
1. Make sure installation and wiring connections are according to job specifications before applying power. (Refer to Figure 6 for an example of a multistage application.)
2. Make the necessary adjustments and electrical connections.
3. Put the system in operation and observe at least three complete operating cycles before leaving the installation.
roubleshooting
T
If the control system does not function properly, verify that the proper mode is selected on each module (Heat/Cool, Direct Acting/Reverse Acting). Proceed as follows to determine the cause of the problem:
1. Make sure proper voltage is applied to the A350 control.
a. Connect a digital voltmeter (DVM) between
the 24V and COM terminals located on the control’s left side terminal block (See Figure 2.)
If an external transformer is used, select AC
volts on the DVM and verify that the voltage is between 20 and 30 VAC.
If a Y350R Power Module is used, select DC
volts on the DVM and verify that the voltage is between 16 and 38 VDC.
b. If the DVM reading is within the indicated
voltage range, proceed to Step 2.
c. If the DVM reading is not within the indicated
voltage range, correct the wiring, replace the Y350R, or replace the external transformer.
8 System 350 A350A/B Electronic Temperature Control Product/Technical Bulletin
2. Check temperature sensor for proper resistance. a. Take an accurate, independent temperature
reading at the sensor location.
b. Disconnect the sensor from the control. Using
an ohmmeter, measure the resistance across the two sensor leads. Consult Figure 7 to verify sensor conformance.
°F
260 240 220 200 180 160 140 120 100
80 60 40 20
-20
-40
0
500
700 900
Temperature
1100
1300 1500
1700 1900
Resistance (Ohms)
°C
120 100
80 60 40
20
0
-20
-40
2100
Figure 7: Temperature vs. Resistance
Chart for the A99B Series Sensor
c. If the resistance varies substantially from the
optimal resistance for that temperature, the sensor or wiring must be replaced.
Note: The sensor reading indicated by the D350 may
differ from thermometer readings due to sensor tolerances, time constants, accuracy of thermometer, and other factors.
3. Check the A350 for proper operation. Note: Steps 1 and 2 must be performed first.
a. Adjust the setpoint dial to at least 40°F (22°C)
below the sensor temperature determined in Step 2.
b. Increase setpoint by slowly turning the dial
until the control relay and LED turn On and Off.
c. If the relay does not perform as indicated in
Table 4, replace the A350.
Table 4: A350 Relay Troubleshooting
Action LED
Heating Heating Cooling Cooling
*(Ts) is sensed temperature, and (Sp) is setpoint temperature.
epairs and Replacement
R
N.O. Contact
Status
On Closed (Ts) = Sp - Diff Off Open (Ts) = Sp On Closed (Ts) = Sp + Diff Off Open (Ts) = Sp
Do not make field repairs or perform calibration. Replacement controls and A99B Temperature Sensors are available through the nearest Johnson Controls representative. See Tables 5 and 6 for ordering information.
Setpoint
Dial Setting*
rdering
O
Table 5: System 350 Products
Item Product Code
Number
A350 Temperature Controls (With Temperature Sensors)
A350 Controls Without Sensors
Digital Temperature Setpoint Display Modules
On/Off Stage Modules
Slave Stage Modules Proportional Stage Modules Power Module
A350AA-1C A350AA-2C A350AA-3C A350BA-1C A350BA-2C
A350AB-5C A350AB-1C A350AB-2C A350BB-1C
D350AA-1C D350BA-1C
S350AA-1C S350AB-1C
S350CC-1C Dual Scale (°F and °C) S350PQ-1C Dual Scale (°F and °C) Y350R-1C 120/240 VAC, 50/60 Hz Input; Rectified Class 2, 24 VAC Output
System 350 A350A/B Electronic Temperature Control Product/Technical Bulletin 9
Description
Range: -30 to 130°F; Adjustable Differential: 1 to 30F° Range: 90 to 250°F; Adjustable Differential: 1 to 30F° Range: -30 to 130°F; Adjustable Differential: 1 to 30F° (concealed setpoint) Range: -35 to 55°C; Adjustable Differential: 0.5 to 17C° Range: 30 to 120°C; Adjustable Differential: 0.5 to 17C°
Range: 90 to 150°F; Adjustable Differential: 1 to 30F° Range: -30 to 130°F; Adjustable Differential: 1 to 30F° Range: 90 to 250°F; Adjustable Differential: 1 to 30F° Range: -30 to 130°F; Adjustable Differential: 1 to 30F°
Fahrenheit Scale Celsius Scale
Fahrenheit Scale Celsius Scale
Table 6: System 350 Accessories
Item Product Code
Number
Enclosure Wall Mount Plate Cover Mounting Clip Duct Mounting Duct Mounting Conduit Adaptor Immersion Well Sun Shield DIN Rail Sections
DIN Rail End Clamp Cables for Remote Mounting
of D350 Display Module
pecifications
S
Supply Voltage
Power Consumption
Ambient Temperatures
Setpoint Adjustment Range
Differential Adjustment Range
SPDT Relay Output
Agency Listings
The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these specifications, consult Johnson Controls Application Engineering at 1-414-524-5535. Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products.
BOX10A-600R Outdoor PVC sensor enclosure; includes wire nuts TE-6001-4 Includes sensor mounting clip T-4000-2644 For wall mount plate A99-CLP-1 Surface mounting clip for the A99B Temperature Sensor TE-6001-1 Duct-mounting hardware with handy box for A99B sensor TE-6001011 Duct-mounting hardware without handy box for A99B sensor ADP11A-600R 1/2 in. Snap-fit EMT conduit adaptor (box of 10) WEL11A-601R For liquid sensing applications SHL10A-603R For use with outside sensors in sunny locations BKT287-1R BKT287-2R PLT344-1R Consists of two end clamps WHA29A-600R WHA29A-603R WHA29A-604R
Product
Humidity
Sensor
Material
A350A/B Electronic Temperature Control Y350R Power Module: Input: 120/240 VAC 50/60 Hz
Output: 24 VDC, unfiltered, 10 VA, Class 2 External Source: 24 VAC, 50/60 Hz Class 2 (20-30 VAC) Note: Only one supply voltage source may be used.
1.4 VA Operating: -30 to 150°F (-34 to 66°C) Shipping: -40 to 185°F (-40 to 85°C) 0 to 95% RH non-condensing; maximum dew point: 85°F (29°C) See Table 5. See Table 5. 120V 208 to 240V Horsepower: 1/2 1/2 Full Load: 9.8A 4.9A Locked Rotor: 58.8A 29.4A Non-Inductive: 10A at 24 to 240 VAC Pilot Duty: 125 VA at 24 to 240 VAC Replaceable positive temperature coefficient sensor Reference resistance: 1035 ohms at 77°F (25°C) Case and cover: NEMA 1 high-impact thermoplastic UL Listed, CCN XAPX, File E27734 UL Listed for Canada, CCN XAPX7, File E27734
Description
12 in. (0.3 m) long 39-1/3 in.(1.0 m) long
3 ft (0.9 m) This can also be used to daisy chain S350 Stage Modules together. 25 ft (7.6 m) 50 ft (15.2 m)
Controls Group
507 E. Michigan Street P.O. Box 423 Printed in U.S.A. Milwaukee, WI 53201 www.johnsoncontrols.com
10 System 350 A350A/B Electronic Temperature Control Product/Technical Bulletin
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