Watlow EZ-ZONE
®
PM PID Controller • 10 • Chapter 2 Install and Wire
Installation
case
retention collar
panel
bezel
gasket
case
retention collar
panel
bezel
gasket
1. Make the panel cutout using the mounting tem-
plate dimensions in this chapter.
Insert the case assembly into the panel cutout.
2. While pressing the case assembly firmly against
the panel, slide the mounting collar over the back
of the controller.
If the installation does not require a NEMA 4X
seal, simply slide together until the gasket is
compressed.
Slide the mounting collar over
the back of the controller.
Place the blade of a screw-
driver in the notch of the
mounting collar assembly.
3. For a NEMA 4X (UL50, IP66) seal, alternately
place and push the blade of a screwdriver against
each of the the four corners of the mounting col-
lar assembly. Apply pressure to the face of the
controller while pushing with the screwdriver.
Don't be afraid to apply enough pressure to prop-
erly install the controller. The seal system is
compressed more by mating the mounting collar
tighter to the front panel (see pictures above). If
you can move the case assembly back and forth
in the cutout, you do not have a proper seal.
The tabs on each side of the mounting collar have
teeth that latch into the ridges on the sides of the
controller. Each tooth is staggered at a different
depth from the front so that only one of the tabs,
on each side, is locked onto the ridges at a time.
Note: There is a graduated measurement difference between
the upper and lower half of the display to the panel. In order to
meet the seal requirements mentioned above, ensure that the
distance from the front of the top half of the display to the panel
is 16 mm (0.630 in.) or less, and the distance from the front of
the bottom half and the panel is 13.3 mm (0.525 in.) or less.
Removing the Mounted Controller from Its Case
1. From the controller's face, pull out the tabs on
each side until you hear it click.
Pull out the tab on each side
until you hear it click.
Grab the unit above and
below the face and pull for-
ward.
2. On a PM6 control once the sides are released
grab the unit above and below the face with two
hands and pull the unit out. On the PM4/8/9 con-
trols slide a screwdriver under the pry tabs and
turn.
çWarning:
• This equipment is suitable for use in class 1, div. 2, Groups
A, B, C and D or Non-Hazardous locations only. Temperature
Code T4A.
• WARNING – EXPLOSION HAZARD. Substitution of component
may impair suitability for class 1, div. 2.
• WARNING – EXPLOSION HAZARD. Do not disconnect equip-
ment unless power has been switched off or the area is known
to be nonhazardous.
Returning the Controller to its Case
1. Ensure that the orientation of the controller is
correct and slide it back into the housing.
Note: The controller is keyed so if it feels that it will not
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