Warner Instruments FireRight LT User manual

OPERATION
To operate the FireRight LT manually, proceed as follows:
1. Turn the kiln on.
2. Notice either the HEAT or LIMIT light glows, indicating that the system
is on.
3. When operating manually, the controller has two modes; soak or shut-
off. To select the soak mode, depress the pushbutton switch, leaving it
latched in the “pressed’ position. Push the button a second time to release
the latch, leaving the control in the shut-off mode.
4. To reset the controller when latched off in the shut-off mode, depress the
pushbutton, then press it again to release the latch.
5. Adjust the set point knob to the desired soak or shut-off temperature.
6. In the soak mode, the controller will maintain the kiln’s temperature at the
level you have set. In the shut-off mode, the controller will permit the
kiln’s temperature to rise to the limit you have set, then shut it off,
allowing it to cool at its own natural rate.
SERVICE
If you have questions, please give the dealer or kiln manufacturer from whom you
purchased your controller the first opportunity to assist you. FireRight Controls
warrants
FireRight LT units for one-year. We will repair or replace, without charge,
units that fail because of defective material or workmanship. Factory service is available
a reasonable flat rates for all other cases, and can be handled through your dealer, or
factory-direct.
Warner Instruments
1320 Fulton Street PO Box 604
Grand Haven MI 49417 USA
Phone: [phone]
Internet: http://www.fireright.com
© FireRight /Warner Instruments 1996-2009
INSTRUCTION SHEET
FireRight LT
Temperature Controller
for Ceramic Kilns
GENERAL INFORMATION
The FireRight LT Controller is a simple non-indicating temperature controller specially
designed for use with ceramic kilns. Soak and Shut-Off operation is provided for, over a
temperature range of 0 to 2500°F. The controller is provided on a single panel, suitable
for flush mounting on most kiln switch boxes.
The
FireRight LT can be used to supply power for small kilns, and to operate high
voltage power switching devices on larger kilns, such as definite purpose contactors and
mercury relays. Standard push-on connectors permit wiring for either 110vac or 220vac,
50/60Hz power. A single-pole electrical contact, capable switching up to 15 amps at
240vac, constitutes the controller’s output. Since all but the smallest kilns draw more
than 15 amps, a power relay or definite purpose contactor is normally also required to
complete the installation.

INSTALLATION
The FireRight LT kiln temperature controller may be installed on the kiln, or in a remote
enclosure. If installed on the kiln, the temperature at the mounting location must not exceed 130°F
during operation.
The control can be mounted in panels as follows:
1. Provide a rectangular cutout measuring 4 1/8”wide by 5 1/8” high.
2. Insert the FireRight LT in this cutout and mark the locations for its four mounting
screws.
3. Remove the control and drill 7/64” pilot holes at the marked locations.
4. Fasten the FireRight LT to the mounting panel using #6 self-tapping screws.
ELECTRICAL CONNECTIONS
All electrical connections are made at the tabs provided at the top and along the bottom edge of the
control’s circuit board, using ¼” push-on terminals.
The
FireRight LT will work with 50/60Hz input power, either 110/120vac or 208/240vac. Small
kilns drawing less than 15 amps can be operated directly by the control’s output contact. Larger kilns
require a separate power relay, sized according to the nameplate current of the kiln.
The wiring diagram provided in this sheet illustrates a typical installation using a mechanical
contactor (power relay) on a 208/240vac kiln. If the particulars of your installation are somewhat
different:
1. Connect the temperature sensor to the S+ (yellow wire) and S- (red wire) terminals.
Any Type K thermocouple may be used. The
FireRight LT is unaffected by sensor
or extension wire resistance, although the sensor cable must by Type KX
thermocouple extension wire (do not use copper hookup wire.)
2. For 120vac systems, connect terminal L1 to aand terminal bto L4.
3. For 220vac systems, connect terminal ato terminal b.
4. Connect one leg of the input power to terminal L1, and the other to L4. (Most
power relays have auxiliary terminals that are intended as a convenient source of
control power. L1 and L4 can usually be connected to the power relay at these
auxiliary terminals.)
5. Connect the output contact of the FireRight LT to interrupt current either to the
kiln’s electric heaters, or the solenoid coil of the power relay. This normally open
contact is provided between terminals H1 and H2.
6. If operating the kiln’s electric heaters directly, connect one leg of the power line to
H1, one end of the heating element to H2. Connect the other end of the heating
element to the other leg of the power line.
7. If using a power relay, connect H2 to L1, then connect H1 to either one of the
power relay’s coil terminals. Next connect the second coil terminal to a L4 auxiliary
terminal on the same power relay.
Please note that the
FireRight LT modulates power to the kiln on an ON/OFF basis. Kilns are often
equipped with a motor-driven shut-off timers; in such cases, the power relay should be connected so
that it does not interrupt power to the timer. Please also note that certain types of mercury relays,
when used to switch high electrical heater current, can be highly inductive, and may cause the
FireRight LT output contact to switch erratically. If any “chattering” is evident (HEAT light
flickering), consider attaching a snubber network (available from any electrical supply) across the
relay’s solenoid coil.
baL1H1 L4H2
POWERCORD
FROM
TOHEATERS
S+ S-
T
yp
ical S
y
stem Wirin
g
–
208/240vac 50/60 Hz Connections