Advertisement
Figure 2A - Dual Switch
Figure 2B - Single Switch
Figure 2C - Terminal Block Option
Types 800S, 802S and 802PS
(Skeleton units)
Wire directly to the leadwires, in the same
manner as above.
Types 820E and 822E
(Explosion-proof)
Connect the electrical conduit directly to the die-
cast aluminum enclosure via 3/4 NPTF connec-
tion. Wire directly to the terminal block. See
Figure 2D. Wiring enclosure includes grounding
terminal.
Figure 2D - Explosion Proof
Part II - Adjustments
5/16" Open End Wrench (2 required)
Switch Settings
(Dual switch types only)
The basic enclosed and skeleton dual switch
controllers are furnished with a choice of
individual or common adjustment of set points
as described below.
Types 802 and 802S have a separate knob and
pointer for each switch. Turn black knob for
switch #2 and turn green inserted knob for
switch #1. Set points are shown by individual
pointers and may be separated up to 100% of
dial range apart, so long as the red pointer is
set higher than the green pointer.
Types 802P, 822E AND 802PS have a single
knob and pointer for both switches. Both
switches are standardly, factory set together
within 5% of the dial range. Turning the knob
positions both switch simultaneously, maintain-
ing a constant separation between switches.
Replace cover and adjustment knob if removed
during installation. Controller is ready for
operation. Turn setting pointer to desired
control temperature and start up the process.
To suit particular process conditions or for
greater controller accuracy it may be desirable
to make slight alterations to the set point or
indicator reading. Procedures for making these
adjustments are described below.
Note:
Indicating Pointer Deflection:
The indicating pointers will read slightly low
when the bulb temperature is 15° above the
controller setting. This deflection is normal and
repeatable (approximately 0.5% of scale range
on single switch models) and is due to the
transference of the switching mechanism load
to the thermal system. It can be measured by
moving the setting pointer from the high to the
low end of the scale and observing the resultant
indicating pointer deflection.
Note: Prior to making any controller adjust-
ments, the cover and adjustment knobs should
be removed. When adjustments are completed,
all applicable parts should be replaced.
Tools Needed
5/64th" Allen Wrench
Screwdriver
1/4" Open End Wrench
9/16" Open End Wrench
Advertisement
