Let’s take a look at how to determine whether this valve is open or closed
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Two photos were taken: one of the blower inlet, and another of the heating furnace air duct. There are different opinions on this – what do you think is the correct way to interpret it?
If it cannot be determined, it’s necessary to try it out in practice. First, set it to the fully off position (using the scale markers), then start the unit and check the current. If the value is low, then it matches the readings on the scale; if it’s high, then the situation is the opposite.
Butterfly valve…… This switch label is really confusing
Dude, take pictures of both the path of the flue and that of the air duct. At least that way I’ll know the direction of the first one; the pointer aligns with the orientation of the internal baffles
The first one shows the flue gas entering the preheater, with the flow direction from top to bottom； The second one is the induced draft fan inlet butterfly valve, from left to right