Operating instructions

34 Cone-Fire / Ramp-Hold
Unplug the kiln or disconnect the power. Remove
the 4 screws holding the controller faceplate to the
switch box. Gently remove the old controller.
Disconnect the wires from the old controller.
If your kiln is
top-loading and origi
-
nally came with a
DTC 100 or 600, the
heat shield inside the
switch box may need
to be moved to give
more clearance for
the new Sentry con
-
troller. Measure the
space between the
heat shield and the
front of the box. If the
spaceislessthan1
¾”, remove the
screws that hold the
bottom of the heat shield. These screws are on the
sides near the louvers. Drill new holes in the switch
box next to the bottom 2 holes used for the heat
shield. Move the bottom of the heat shield back
and fasten screws in
the new holes.
Thread the Sentry
wiring harness into
the switch box by in
-
serting it in the open
-
ing wherethe control
-
ler goes. Let the end
with the plugs hang
out of the box.
Remove the switch
box from the kiln by
removing the screws
holding the box to the
kiln.
The red wire from the
old controller con
-
nects to the relay(s).
The red wire in the Sentry wiring harness goes to
the same relay terminal. (See diagram, facing
page.) You will notice that the red Sentry wire has
3 push-on connectors with jumper wires. If your
kiln has 3 relays, you will use all 3 push-on connec
-
tors, 1 for each relay. If you have 2 relays, cut off
the last terminaland jumper wire. If your kiln has 1
relay, cut off two push-on connectors. Cut the wire
closetothe terminal that remains (see next photo).
Appendix C: Upgrading Instructions
Upgrading the DTC 100, 600, 800 & 1000 Series to the Sentry
CAUTION: Cut off the ex
-
tra terminal(s) and jumper
wire(s) unless they attach to
relays. Unconnected wires
that touch a grounded object
candamageyour controller!
Attach the redwire termi
-
nal(s) to the relay(s). Fol
-
low steps 6 and 7 forthe black wire, which also goes
to the relays.
Note how the white, orange, and blue wires of the
old controller are connected to the transformer.
Removing and replacing one wire at a time, con
-
nect the Sentrywhite, orange,and blue wires to the
transformer the same way. (See Transformers,
next page. Cut off the extra blue wire terminal if
your transformer doesn’t need it.)
Remove the old wiring harness from the switch
box. With the thermocouple wires and the Sentry
connection plugs hanging out of the front of the
switch box, move the box into place on the kiln. Ar-
range the wires so that when the switch box is fas-
tened to the kiln, the wires and wire nuts will not
touchan element connector or the kilncase. Install
the screws that hold the switch box to the kiln.
Straighten the ends of the thermocouple wires.
Attach them to the thermocouple terminals on the
bottom of theSentry. (Use the center connectors if
your kiln has only one thermocouple.) Make sure
the thermocouple wires are tight and that there is
no short.
Attach the two plugs
to the back of the Sen
-
try controller. Care
-
fully insert the Sentry
into the controller
opening on the switch
box. Install the 4 cor
-
ner screws.
Lever type connectors: if the wire is
too thick, it will break the lever. Do
not force the lever downward.
The button-type thermocouple
connector: press down, then insert
wires.
The extra wires tied to the harness
are for multiple zone kilns and the
optional AOP electrical outlet. The
green grounding wire is connected
only if you use a computer interface.
Inserting the plugs on the back of
the Sentry.