Pentair 920 Series Installation, Operating And Maintenance Instructions page 12

INDUSTRIAL HEAT TRACING SOLUTIONS
The user may want to consider enclosure drain holes in applications where moisture is a problem;
drill 0.125" holes in the bottom of the enclosure on both the left and right sides. Two holes reduce
the possibility that one will plug and ensures drainage if the enclosure is not perfectly level.
Note that drilling holes in the enclosure compromises the NEMA 4 rating. Controllers should be
removed from the enclosure before any holes are drilled or cut to prevent damage due to flying
debris.
2.6.1 ControL moduLe InstaLLatIon and removaL
CAUTION:
Always ensure that the power to the unit is turned off during installation or removal to avoid the
risk of injury and damage to the controllers.
WARNING:
explosion hazard! Do not install or remove the control module while the unit is powered.
Fig 2.1 Control module installation
The 920 series controller is designed to be mounted to a flat back plate/panel using a terminal
board. This plug-in design simplifies installation and maintenance by allowing all of the low-
voltage field wiring to remain undisturbed while a control module is installed or removed.
Installation of the control module is easily accomplished by plugging it into the connector on the
terminal board.
• The module is fully inserted once its rear cover is flush to the top surface of the terminal board.
The connectors are designed to be self-aligning, so no undue force should be required.
• Next, secure the module using the two captive screws provided (one located on each side of
the rear cover). These should thread easily into the terminal board. Be sure to align the screws
properly to avoid cross-threading them.
To remove the control module, loosen the two captive screws. Once they have been completely
loosened, they will float freely in their re-spective retaining collars without falling out. The module
may now simply be pulled straight out of its connection.
2.6.2 operator ConsoLe InstaLLatIon and removaL
The operator console is designed to be easily installed or removed while the controller is
powered—even in Class I Division 2 and Zone 2 hazardous areas. It may be temporarily or
permanently installed.
The console is installed in three steps:
Step  "Hook" the lip provided on the rear cover of the console over the top edge of the control
module front plate.
Fig. 2.2 Console installation – Step 1
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