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1 Unplug the kiln or disconnect the power. Remove
the 4 screws holding the controller faceplate to the
switch box. Gently remove the old controller.
2 Disconnect the wires from the old controller.
3 If yourkilnis top-load
-
ing and originally
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
controller. Measure
the space between the
heat shield and the
front of the box. If the
space is less than 1
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
either the box or the heat shield. Move the bottom
of the heat shield back and fasten screws in thenew
holes.
4 Thread the Sentry
wiring harness into
the switch box by in-
serting it in the open
-
ing where the control
-
ler goes. Let the end
with the plugs hang
out of the box.
5 Remove the switch
box from the kiln by
removing the screws
holding the box to the
kiln.
6 The red wire from the
old controller con
-
nects to the relays.
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, youwill use all 3 push-on connectors,1
for each relay. If you have 2 relays, cut off the last
terminal and jumper wire. If your kiln has 1 relay,
cut off two push-on connectors. Cut the wire close
to the other terminal (see next photo).
28
Appendix C: Upgrading Instructions
Upgrading the DTC 100, 600, 800 & 1000 to the Sentry
CAUTION: Cut off the
extra terminal(s) and
jumper wire(s) unless they
are attached to relays. Un
-
connected wires that touch
a grounded object can
damage your controller!
7 Attach the red wire termi
-
nal(s) to the relay(s). Follow steps 6 and 7 for the
black wire, which also goes to the relays.
8 Note how the white, orange, and blue wires of the
oldcontroller areconnected tothetransformer. Re
-
moving and replacing one wire at a time, connect
the Sentry white, orange, and blue wires to the
transformer the same way.
9 Find the green grounding screw. Securely fasten
the green wire under the nut of grounding screw.
10 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
touch an element connector or the kiln case. Install
the screws that hold the switch box to the kiln.
11 Straightenthe ends ofthe thermocouplewires. At
-
tach them to the thermocouple terminals on the
bottom of the Sentry. (Use the center connectors if
your kiln has only one thermocouple.) Make sure
the thermocouple wires are tight.
11 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 typeconnectors: ifthe wireis
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.
Inserting the plugs on the back of
the Sentry.