Penn A421 Series Installation Manual

Penn A421 Series Installation Manual

Electronic temperature controls with off-cycle defrost
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Applications
Important: Use this A421 Series Electronic
Temperature Control only as an operating control.
Where failure or malfunction of the A421 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 A421
Control.
Important: Utiliser ce A421 Series Electronic
Temperature Control uniquement en tant que
dispositif de régulation. Lorsqu'une défaillance
ou un dysfonctionnement du A421 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 A421 Control.
The A421 Series Electronic Temperature Controls are
single-stage, electronic temperature controls with a single-
pole, double-throw (SPDT) output relay.
A421 Controls feature a backlit LCD with adjustable
brightness and three-button touchpad interface that you
can set up to restrict user adjustments. An LED indicates
the output relay's on/off status.
A421 Controls have simple on and off temperature
settings for heating or cooling, an adjustable anti-short
cycle delay, temperature setback, and sensor offset
capability. The temperature control range is -40°F to 212°F
or -40°C to 100°C.
The A421 Controls are available either in Type 1 (NEMA),
IP20 (CE), high-impact plastic enclosures suitable for
surface or DIN rail mounting (Figure 1), or in Type 4X
(NEMA), IP66 (CE) watertight, corrosion resistant surface
mount enclosures (Figure 2).
A421 Series Electronic Temperature Controls
with Off-Cycle Defrost Installation Guide
Dimensions
Figure 1: A421 Control with Type 1 (NEMA), IP20
enclosure dimensions, in. (mm)
Figure 2: A421 Control with Type 4X (NEMA), IP66
enclosure dimensions, in. (mm)
Off-Cycle Defrost control
You can use the A421 Control with Off-Cycle Defrost to
set up regular, passive defrost periods of 1 minutes to 99
minutes. The defrost interval can range from 2 hours to 24
hours, or you can set it to 0 for no defrost interval. You can
also start or stop a defrost cycle in the following two ways:
Part No. 24-7664-3035 Rev. D
2018-11-13
A421ABD, A421AED

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Summary of Contents for Penn A421 Series

  • Page 1 A421 Control. The A421 Series Electronic Temperature Controls are single-stage, electronic temperature controls with a single- pole, double-throw (SPDT) output relay. A421 Controls feature a backlit LCD with adjustable brightness and three-button touchpad interface that you can set up to restrict user adjustments.
  • Page 2 Control includes an A99 sensor. Any A99 Series sensor • Allow sufficient space to connect and route wires, view works with the A421 Series Controls. Do not replace an the LCD, and use the touchpad. A99 Series sensor with any other brand, series, or type •...
  • Page 3 Disconnect or isolate all power supplies before mak- Observe the following guidelines, procedures, and ing electrical connections. More than one disconnec- illustrations when you wire an A421 Series control and A99 tion or isolation may be required to completely de-en- Series sensor.
  • Page 4 This is now the default shielded behavior for the binary input. cable Connects the low-voltage common from the sensor and binary input. Connects the low-voltage input signal wire from control sensors. A421 Series Electronic Temperature Controls with Off-Cycle Defrost Installation Guide...
  • Page 5: Setup And Adjustments

    • OFF < On = Cooling mode = Snowflake icon Important: During normal operation, adjusting just the On value or just the OFF The A421 Series Control has a backlit LCD screen (Figure value on the A421 Control changes the 5). You can adjust the LCD brightness. During normal...
  • Page 6 You can still start or stop a defrost cycle by setting the SdF parameter or by • The Main screen displays BIN in the upper-right using the binary input. corner of the LCD. A421 Series Electronic Temperature Controls with Off-Cycle Defrost Installation Guide...
  • Page 7 1 = output relay To navigate through all of the parameter code energized screens, press Down or Up. A421 Series Electronic Temperature Controls with Off-Cycle Defrost Installation Guide...
  • Page 8 To scroll through all of the basic parameter codes and display the preferred code, press Down or Up With the preferred parameter code displayed, press MENU to display the current parameter value for the code. A421 Series Electronic Temperature Controls with Off-Cycle Defrost Installation Guide...
  • Page 9 Down or Up to scroll through all of the parameter code’s usable values and display the preferred value. With the preferred parameter value displayed, press MENU to save the displayed value and go to the next parameter code. A421 Series Electronic Temperature Controls with Off-Cycle Defrost Installation Guide...
  • Page 10 To set the A421 Control to the restricted adjustment mode, position the P1 jumper located on the circuit board next to the TB3 terminal block. See Setting the control to Restricted Adjustment mode. A421 Series Electronic Temperature Controls with Off-Cycle Defrost Installation Guide...
  • Page 11: Troubleshooting Procedure

    Note: To completely restrict and lockout all user adjustment on the control, set the HtS value equal A421 Series Controls display fault codes on the LCD as to the On or OFF value and the LtS value equal to described in Table 4.
  • Page 12: Repair Information

    Ordering information sensor wiring is correct, replace the sensor. Figure 15: Temperature versus sensor resistance See Table 5 to order a standard A421 Series Electronic Temperature Control. See Table 6 and Table 7 for more information about A99 sensors, mounting hardware, and other accessories used to install A421 Controls.
  • Page 13: Technical Specifications

    -40ºF to 212ºF or -40ºC to 100ºC. Low Voltage Directive. Australia and New Zealand: RCM, Table 7: Accessories Australia/NZ Emissions Compliant Product code Description BKT287-1R 12 in. (305 mm) long DIN rail section A421 Series Electronic Temperature Controls with Off-Cycle Defrost Installation Guide...
  • Page 14: North American Emissions Compliance

    • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. • Consult the dealer or an experienced radio/TV technician for help. A421 Series Electronic Temperature Controls with Off-Cycle Defrost Installation Guide...
  • Page 15 WESTENDHOF 3 507 E MICHIGAN ST MANAGEMENT 45143 ESSEN MILWAUKEE WI 53202 NO. 32 CHANGJIJANG RD NEW GERMANY DISTRICT WUXI JIANGSU PROVINCE 214028 CHINA For more contact information, refer to www.johnsoncontrols.com/locations. A421 Series Electronic Temperature Controls with Off-Cycle Defrost Installation Guide...
  • Page 16 © 2019 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...

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A421abd-02cA421aed-01cA421aed-02c

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