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Figure 55: VB-1200 Modulating Control
Figure 56: 10:1 Systems
Maxitrol EXA Star Controller
Operation
1 .
Remove the two screws holding the cover.
2 .
Connect switched OFF 24V (AC/DC) power source to
Terminals 3 and 4.
3 .
Set DIP switches to match available control signal.
4 .
Connect switched OFF control signal to Terminals 1 and
2. Observe polarity. Note that the return or signal ground
must be connected to Terminal 2.
5 .
Switch power and control signal ON.
6 .
Set valve (see Valve Setting).
7 .
Replace cover.
Valve Setting
The EXA Star modulating valve series has two buttons and
an LED for the user interface. The buttons are used to set the
valve for high and low fire settings (Figure XX).
• High fire setting: LED will be solid red
• Low fire setting: LED will be blinking red
• Operating mode: LED will be OFF
Figure 57: Maxitrol EXA Star LEDs
Optional Gas Heat
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IM 1125-13 • REBEL ROOFTOPS