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Burner Control/Flame Safety
Series 90 Control – HercuLine® 2001 model only
24 HercuLine™ 2000 Series Actuator - Installation, Operation and Maintenance Manual Revision 7
7/08
Series 90 Control – HercuLine
®
2001 model only
Series 90 Controls are commonly used in building environmental systems and flame safeguard systems to
provide modulating control. The control is affected by balancing a 135 ohm potentiometer. The HercuLine
2001 provides an emulation of this system as follows. The current output is used to excite the potentiometer in
the controller. To do this it is set permanently at 11 ma. This produces a 1.5 volt span. The wiper is then
connected to the HercuLine 2001 input, which is operating in voltage mode. The returns from both the input
and the output are tied together.
Series 90 terminals are typically color coded white, red and blue. Conventionally, red is the wiper and white
and blue are the two ends of the potentiometer. On a drop in temperature, the wiper moves toward the blue
terminal.
Connections
4-20mA output
4-20mA input
1+
2-
4+
5-
White
Red
Blue
TB3
Figure 14 Series 90 connections
Considerations
1.
This connection performs an emulation of a series 90 motor. If the controller being used is also an
emulation of a Series 90, the connections required may be different. Shown in
Figure 15 are the
connections found necessary to connect a T775 controller through an S443A S90 Auto/Manual Control. If
the controller has the capability to provide a 4/20 or voltage output, it is easier to use that mode. It will
require only two wires and it will allow the independent use of the 4/20 output. If help is required, contact
Honeywell.
2.
Due to variations in the definition of rotation directions, it may be necessary to reverse the action of the
actuator from CCW to CW or vice versa.