A421 Series Standard Electronic Temperature Controls Installation Instructions
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1
Applications
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
can be 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 to 212°F or -40 to 100°C.
The A421 controls are available either in Type1
(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).
Dimensions
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.
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)
A421 Series Standard Electronic Temperature
Controls
Installation Instructions
A421ABC-x, A421AEC-x,
A421GBF-x, A421GEF-x
Part No. 24-7664-3019, Rev. B
Issued November 6, 2015
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