HydroStat User Guide

IGNITION LED LEGEND and OPERATION

PROPER PILOT FLAME

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LIMITS Illuminates on a call for heat to indicate the

external limits are satisfied. (External limits may include flame

rollout, spill switch, secondary low water cut-off etc.). If the

external limits are open, the LIMITS light will blink.

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V-PWR Indicates power has been sent to the vent

damper (Model 4200a) or the inducer motor (Model 4200i).

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V-SW Illuminates when the vent damper switch (on an

atmospheric boiler) or the air pressure switch (on an induced

draft boiler) has made. If the damper end switch (Model

4200a) or the air pressure switch (Model 4200i) fail to make

in 30 seconds, the V-SW light will blink.

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FLAME Illuminates when the pilot flame is lit. If the pilot

flame is not sensed within 75 seconds or if flame is lost, the

FLAME light will blink.

A properly adjusted pilot should have a blue, steady flame

with an inner cone that engulfs 3/8" - 1/2" of the flame rod.

The flame rod should glow bright orange from the heat and

the flame current should be higher than 2.0 µA.

Note: To read flame current see TEST/SETTINGS button on

page 8.

If the pilot flame is over sized, orange in color, and blowing far

beyond the flame rod then the pilot is over fired. The flame cur-

rent will read outside of the nominal range and the pilot should

be adjusted down.

If the flame is small and the inner cone does not engulf the

flame rod then the pilot is under fired. When the pilot is under

fired, the flame rod does not glow bright orange. The flame

current will read below 1.0 µA and should be adjusted up to a

value higher than 2.0 µA.

Note: If the flame current reads below 0.8 µA, the control will

continue to spark as it does not recognize an acceptable

flame current.

Refer to the gas valve manufacturer’s instructions for adjust-

ing the gas valve.

3/8" to 1/2" Flame Coverage

Flame Rod

LIMITS V-PWR V-SW FLAME

IGNITION