Honeywell Fema DCM-203-574 Series Assembly And Operating Instructions Manual page 59

2.
When the switching differential is changed,
the switching point remains unchanged.
The reset point is shifted by the value of
the switching differential.
CAUTION:
When approaching the max. switching
differential value, take care that the
differential spindle not be turned so far as
to hit the stop and possibly jam, as this
could interfere with switching back. In the
event that this nonetheless accidentally
happens, loosen the screw by a half or full
rotation.
MU2B-0238GE51 R0616D
Pressure Switches with Adjustable Switching Difference ...V...-203
RSP = SP – x
d
Fig. 9. Rising pressure
RSP = SP – x
d
SP = switching point
RSP = switch back point
x = switching differential (hysteresis)
d
p = pressure
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