Barnstead International Thermolyne 859 Series, Service Manual

Page: 48 / 118

Amendment
TIMER PROGRAMMING & HIDDEN KEY
PROCEDURES FOR REVISION “I” SOFTWARE
Definition
Hidden Keys provide multiple use of the keypad. Hidden
Key Procedures typically are used to access infrequently
changed user variables and infrequently used diagnostic
procedures. The access, procedure and exit are detailed
under each key procedure. The furnace must be in the
idle (non-programmable) mode to access the Hidden
Keys.
Amendment #1 applies to Operation Manuals, Part
Numbers LT859X1, LT945X1, LT945X3 and LT945X4 for
NCAT Asphalt Content Tester.
Programmable Timer
Heating the furnace to operational levels may require two
or more hours of preheating but leaving the furnace on
constantly may not be efficient, consuming both electricity
and heating elements. To optimize your working hours,
we have designed an automatic preheat timer into your
asphalt testing furnace. This feature allows you to begin
work immediately each day, but only run your furnace as
much as necessary to complete your days work.
Programming the Timer
The following directions will explain how to program the
“wake-up” date and time into your asphalt furnace. This
will determine exactly when the furnace will begin pre-
heating to your setpoint temperate. We recommend that
you set the time for at least 2-1/2 hours before you want
to begin work.
1. Press the timer button on the key pad. The
heating element will shut down at this time.
The wake-up time will be displayed in the
“Elapsed Time” display and the “wake-up” date
will be displayed in the “Percent Loss” display.
2. Enter the “wake-up” date by inputting the
48
Procedures
Note
If you don’t want to enter a “wake-up”
date you can bypass this feature by
simply pressing “ENTER” after you
have presses the timer button in step
1. Bypassing the date automatically
converts the timer from a programma-
ble 364 day timer to a 24-hour timer.
This means that when the pro-
grammed “Time” is reached, the unit
will begin heating, ignoring the “wake-
up” date. The date needs to be set at
0.00 for this to happen.