Johnson Controls A19QSC Series Temperature Controls Installation Guide

Johnson Controls A19QSC Series Temperature Controls

Specifications

• Product Name: A19QSC Series Temperature Controls with Type 4X Enclosures
• Dimensions: 3 in. x 1/2 in. conduit knockout, Four 0.20 in. (5 mm) mounting holes, 0.06 in. (1.5 mm) OD, length varies by model
• Enclosure Type : Type 4X

Product Usage Instructions

Mounting

• Ensure to avoid sharp bends in the capillary tubes to prevent refrigerant leaks or flow restrictions. Secure excess capillary tubing away from sharp or abrasive objects to prevent damage that may lead to refrigerant leaks.
• Do not dent or deform the sensing bulb as it can affect calibration and cause the control to operate at incorrect temperatures.

Wiring

Before you begin:

• Disconnect the power supply before making electrical connections to avoid the risk of electric shock. Use copper conductors only and follow local regulations for wiring connections.
• Use the terminal screws supplied in the contact block to prevent damage to the switch and voiding the warranty.

Wiring Procedure:

1. Loosen the cover screws and remove the cover without damaging the O-ring seal.
2. Select and remove the desired conduit knockout.
3. Connect an approved watertight conduit fitting to the conduit and then to the A19QSC control enclosure.
4. Insert wires through the conduit opening and connect them to the screw terminals following wiring diagrams.
5. Ensure the enclosure O-ring is securely seated for a proper seal between the cover and case.
6. Replace the cover and tighten the screws.

Wiring Diagrams Figure 2: Standard wiring for heating applicationsFigure 3: Standard wiring for cooling application

FAQ

1. Q: What should I do if I encounter refrigerant leaks?
   A: If you suspect a refrigerant leak, immediately turn off the system and contact a qualified technician for repair.

2. Q: Can I use other terminal screws for wiring connections?
   A: It is recommended to use the terminal screws supplied with the product to avoid damaging the switch and voiding the warranty.

A19QSC Series Temperature Controls with Type 4X Enclosures Installation Guide

Applications

• Important: Use this A19QSC Series Temperature Control only as an operating control. Where failure or malfunction of the temperature 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 temperature control.

• You can use the A19QSC Series Temperature Controls for many agricultural applications. For installations that require compliance with Article 547 of the National Electrical Code (NEC), use an A19P or T19P series control.

• The A19QSC Controls use polycarbonate enclosures and are UL listed as Type 4X. For more information, see Dimensions and Technical specifications.

• The A19QSC Controls include internal setpoint adjustment dials and range scales.

Dimensions

See the following figure for the dimensions of the A19QSC controls:
Figure 1: Dimensions for A19QSC Temperature Controls with Type 4X Enclosures, in. (mm)

Mounting

CAUTION

• Risk of Environmental and Property Damage.
  Avoid sharp bends in the capillary tubes. Sharp bends can weaken or kink capillary tubes, which may result in refrigerant leaks or restrictions of flow.

CAUTION

• Risk of Environmental and Property Damage.
• Coil and secure excess capillary tubing away from contact with sharp or abrasive objects or surfaces. Vibration or sharp or abrasive objects in contact with capillary tubes can cause damage that may result in refrigerant leaks (or loss of element charge), which may result in damage to the environment or property.
• Important: Do not install the A19QSC Control where the maximum temperature exceeds 140°F (60°C). If you installing the device where temperatures exceed 140°F (60°C) you could cause damage to the A19QSC Control and you void the warranty.
• To mount the temperature control to a flat surface, insert screws through the mounting ears on the back of the case. For more information, see Figure 1.

Wiring

Before you begin

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.

• Important: Use copper conductors only. Make all wiring connections in accordance with local, national, and regional regulations. Do not exceed the A19QSC Control’s electrical ratings. Important: Use the terminal screws supplied in the contact block. If you use other terminal screws, you could damage the switch and you void the warranty.

The Type 4x enclosure includes three 1/2 in. (1.27 cm) trade-size conduit knockouts. To make wiring connections, perform the following procedure:

1. Loosen the four cover screws and remove the cover. Do not damage the O-ring seal.

2. Select the knockout that you want to remove.

3. Place a screwdriver blade on the knockout near the edge.

4. Apply a sharp blow to the screwdriver handle to loosen the knockout.

5. Connect an approved watertight conduit fitting to the conduit.

6.  Connect the fitting to the A19QSC control enclosure.
   Note: For flexible conduits, you can reverse Step 5 and Step 6.

7. Insert the wire through the conduit opening.

8.  Connect the wires to the screw terminals. For more information, see Figure 2, Figure 3, and Figure 4.

9. Ensure that the enclosure O-ring is securely seated in the groove so that it forms a correct seal between the cover and case.

10. Replace the cover and tighten the screws.

Wiring diagrams
Figure 2: Standard wiring for heating applications

Note: In Figure 2, R to B opens on temperature rise.
Figure 3 : Standard wiring for cooling applications

Note: In Figure 3, R to Y closes on temperature rise.

Figure 4: Standard wiring for combination heating and cooling applications

Note: In Figure 4, R to B opens and R to Y closes on temperature rise.

Setup and adjustments

• Turn the knob under the temperature control cover to adjust the setpoint.
• Before you finish the installation, observe at least three complete operating cycles of the controlled equipment to ensure that all components function correctly. To check for correct A19QSC temperature control operation, see
• Operation for more information.

Heating applications

• The following procedure describes how to adjust the temperature for heating applications.
• Turn the dial clockwise to a setpoint greater than the sensed temperature. The heating system cycles on.
• Turn the dial counterclockwise to a setpoint less than the sensed temperature. The heating system cycles off.
• If the temperature does not operate in this manner, check the wiring and the tightness of the wiring connections.

Cooling or ventilating applications

The following procedure describes how to adjust the temperature for heating applications.

• Turn the dial clockwise to a setpoint greater than the sensed temperature. The ventilating or cooling system cycles off.
• Turn the dial counterclockwise to a setpoint less than the sensed temperature. The ventilating or cooling system cycles on.
• If the temperature does not operate in this manner, check the wiring and the tightness of the wiring connections.

Operation

• When the temperature at the sensing element rises to the setpoint or the dial setting, the switch between R and Y closes and the switch between R and B opens on single-pole, double-throw (SPDT) models. The opposite happens  when the temperature at the sensing element falls below the following value: the setpoint or dial setting minus the differential.
• For more information, see Figure 2, Figure 3, and Figure 4.
• Repair information
  If the A19QSC type electromechanical temperature control fails to operate within its specifications, replace the unit. For a replacement A19QSC control, contact the nearest PENN by Johnson Controls® representative.

Technical specifications

Table 1: A19QSC Series Temperature Controls with Type 4X Raintight Enclosures

Specifications| Applied VAC| 24 VAC| 120 VAC| 208 VAC| 240 VAC| 277 VAC| 600 VAC
---|---|---|---|---|---|---|---
Switch contact ratings| Motor, full load amperes| –| 16 A| 9.2 A| 8 A| –| –
Motor, locked rotor amperes| –| 96 A| 55.2 A| 48 A| –| –
Non-inductive, single- pole, single-throw (SPST) amperes| –| 22 A| 22 A| 22 A| 22 A| –
Non-inductive, SPDT amperes| –| 16 A| 16 A| 16 A| 16 A| –
Pilot duty volt-amperes| 125 A| 125 A| 125 A| 125 A| 125 A| 125 A
Ambient operating conditions| -26°F to 140°F (-32°C to 60°C)
Ambient storage conditions| -40°F to 140°F (-40°C to 60°C)
Shipping weight| 1.2 lb (0.54 kg)
Compliance| UL Listed; File E6688, CCN XAPX (US) and XAPX7 (Canada) UL Listed as Type 4X

The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these specifications, consult Johnson Controls Application Engineering at 800-275-5676. Johnson Controls shall not be liable for damages resulting from misapplication or misuse of its products.

Product warranty

This product is covered by a limited warranty, details of which can be found at www.johnsoncontrols.com/buildingswarranty.

Single point of contact

• JOHNSON CONTROLS
• C/O CONTROLS PRODUCT MANAGEMENT
• NO. 32 CHANGJIANG RD NEW DISTRICT
• WUXI JIANGSU PROVINCE 214028
• CHINA

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• UNITED KINGDOM

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• GLENDALE, WI 53209
• USA

Contact information

• Contact your local branch office : www.johnsoncontrols.com/locations
• Contact Johnson Controls : www.johnsoncontrols.com/contact-us

A19QSC Series Temperature Controls with Type 4X Enclosures Installation Guide

© 2022 Johnson Controls. All rights reserved. All specifications and other information shown were current as of document revision and are subject to change without notice.
www.penncontrols.com

References

• johnsoncontrols.com/
• johnsoncontrols.com/buildingswarranty
• johnsoncontrols.com/contact-us
• johnsoncontrols.com/locations
• PENN

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