Mounting A Type 1/Ip20 Control On Din Rail; Additional Guidelines For Mounting Type 4X/Ip66 Controls; Direct-Mounting A Type 1/Ip20 Control To A Wall Or Other Flat Surface Using The Four Keyhole Slots - Penn A421 Series Installation Manual

• 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).

Mounting a Type 1/IP20 control on DIN rail

1. Provide a section of 35 mm DIN rail that is longer than the control width. Mount the DIN rail in
a suitable location and use 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.
Direct-mounting a Type 1/IP20 control to a wall or other flat
surface using the four keyhole slots
1. Disconnect the power and 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 and leave 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 tighten the mounting
screws to secure the control to the surface.
Note: When you mount the control on an uneven surface, use shims to mount the control
evenly.

Additional guidelines for mounting Type 4X/IP66 controls

You can mount the Type 4X models to flat vertical surfaces using the four holes at the enclosure
corners. Place the control against a flat 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 for removal. 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.
The A421 Control's temperature setback (BI) function requires an additional low-voltage, two-wire
cable for operation. 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.
You can rotate the control enclosure base on the Type 4X/IP66 models 180º relative to the control
enclosure cover and LCD, to bring the electrical connection to the top or bottom of the mounted
control.
Note: Do not twist the wiring harness between the enclosure base and cover more than 180º.
4 A421 Series Electronic Temperature Controls with Off-Cycle Defrost Installation Guide