A421 Series Electronic Temperature Controls with Cycle Timer Installation Instructions
3
• Do not mount the control on surfaces that are
prone to vibration or in a location where
high-voltage relays, motor starters, other sources
of electromagnetic emissions, or strong radio
frequency may cause interference.
• Do not install the control in an airtight enclosure.
• Do not install heat generating devices with the
control in an enclosure that may cause the ambient
temperature to exceed 150°F (66°C).
To mount a Type 1/IP20 control on DIN rail:
1. Provide a section of 35 mm DIN rail that is longer
than the control width, and mount the DIN rail in a
suitable location using appropriate mounting
hardware.
2. Clip the control module on the rail, position the
module’s upper DIN rail clips on the top rail, and
gently snap the lower clips on to the bottom of the
rail.
To direct-mount a Type 1/IP20 control to a wall or
other flat surface using the four keyhole slots:
1. Remove the enclosure cover, place the control
horizontally against the wall surface in a suitable
location, and mark the keyhole slot locations on the
mounting surface.
2. Install appropriate screws or fasteners, leaving the
screw heads approximately one or two turns away
from flush to the mounting surface.
3. Position the control mounting slots over the screw
heads, and then carefully tighten the mounting
screws to secure the control to the surface.
4. When mounting the control on an uneven surface,
use shims to mount the control evenly on the
surface.
Additional Guidelines for Mounting Type 4X/IP66
Controls
The Type 4X models may be mounted to flat vertical
surfaces using the four holes at the enclosure corners.
Place the control against aflat wall surface in a suitable
location, and mark the mounting screw hole locations
on the mounting surface. Use appropriate screws and
shims to mount the control evenly on the surface.
On Type 4X models, select the knockout to be
removed. Place a screwdriver blade on the knockout
near the edge. Apply a sharp blow to the screwdriver
handle to loosen the knockout. Be careful not to
damage the control’s interior components.
An additional low-voltage, two-wire cable is required to
operate the A421 (optional) manual override feature.
On Type 4X/IP66 enclosures, you must install a
suitable watertight fitting in an available knockout to
pass the two-wire cable through the enclosure wall.
The control enclosure base on the Type 4X/IP66
models can be easily rotated 180º relative to the
control enclosure cover and LCD, allowing you to bring
the electrical connection to either the top or bottom of
the mounted control.
Note: Do not twist the wiring harness between the
enclosure base and cover more than 180º.
Wiring
Observe the following guidelines:
WARNING: Risk of Electric Shock.
Disconnect or isolate all power supplies
before making electrical connections.
More than one disconnection or isolation
may be required to completely
de-energize equipment. 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 ou isoler toute alimentation
avant de réaliser un raccordement
électrique. Plusieurs isolations et
débranchements sont peut-être
nécessaires pour couper entièrement
l'alimentation de l'équipement. Tout
contact avec des composants porteurs
de tensions dangereuses risque
d'entraîner une décharge électrique et de
provoquer des blessures graves, voire
mortelles.
IMPORTANT: Use copper conductors only. Make
all wiring in accordance with local, national, and
regional regulations.
IMPORTANT: Do not exceed the A421 control’s
electrical ratings. Exceeding the electrical ratings
can result in permanent damage to the control and
void any warranty.
