26
Program Reset
A running, held or finished program can be reset by depressing the up and down push buttons together.
When the reset has been enabled, the parts of the display associated with programming will be
extinguished and the controller will operate as a single setpoint control.
NOTE
The temperature control in these models is a programmable "and" automatic single setpoint
device. When the program has ended, the controller will maintain the chamber temperature
at a value equal to the last programmed level (PL)
until the program is cancelled. It will not
automatically cool to ambient unless last programmed level (PL)
is set at ambient. When a
program is cancelled, the controller will maintain the chamber temperature at a value equal
to the main setpoint (SP1 or SP). To cancel a program, depress and release the "UP" and
"DOWN" push buttons simultaneously. Be sure single set point mode is set to 20 or below
degrees as described earlier in this manual.
Installation and Operation of Air Control
NOTE
Coal ashing furnaces -60 models contain a feature to provide air (or inert gas) flow within the
furnace chamber.
Installation
NOTE
A pressurized air line with a minimum working pressure range of 0 to 20 psi is required.
Compressed air hook-up
1. At the rear of the furnace is located a 0.250 inch tube fitting.
2. Using 0.250 inch I.D. rubber tubing, connect a length of tubing from this input fitting to a
corresponding 0.250 inch fitting located on the regulated side of a pressurized air service line.
3. Prior to making connections at the regulator, insure that the regulator is turned fully closed (0
psi).
4. Turn flow control valve located at the bottom of the flowmeter (front control panel) fully clockwise
to closed position.
5. Turn regulator to maximum output pressure of 20 psi. Check for any leaks at connection points of
connecting tubing.
6. Open flow control valve slowly until ball in flow meter reads between 40 to 45 liters per minute
flow rate.
NOTE
A flow rate of 40 to 45 liters per minute will provide three air exchanges of the chamber per
minute.
7. Open furnace door and check that air is exhausting from the manifold located at the bottom rear
of the chamber.
8. Turn flow control valve to off (fully clockwise).
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