In the "OPERATOR" mode the controller has the display option programmed into it such that the
process or hot oil temperature and the current set point are displayed simultaneously. This
option informs the user of these two pieces of information on a continuous basis.
The other keys on the controller are used to access the other modes ("CALIBRATION" and
"TUNE"). A detailed explanation of all the operating modes in the temperature controller is
presented in SECTION 6.Z: HEATER COMPONENTS TEMERATURE CONTROLLER.
The set point temperature on the ECLIPSE Model 2004 serves two purposes. First, it is the
temperature around which the burner will turn on and shut off. It is factory set to have the burner
come on at 20°F below the set point and shut off at 5F above the set point. Second, the set
point temperature is the temperature around which the burner will modulate (i.e. change firing
rates). The burner will begin to modulate from its full firing rate (i.e. high fire) at 15F below the
set point. It will be at its lowest firing rate at approximately the set point. The following example
should help clarify the role of the set point as temperature is increasing.
(page 3 - 943)