Honeywell Fema DCM-203-574 Series Assembly And Operating Instructions Manual page 67

5.3 Adjustment
Adding together the adjustment values set
using setting wheels I and II yields the
switching interval between the two micro-
switches. Changes made at the setpoint
spindle S do not affect the switching
interval; the switching interval remains
constant over the entire adjustment range
of the spindle, the two switching points
being displaced up or down in parallel.
Fig. 16. Setting spindles
MU2B-0238GE51 R0616D
5. Two-Stage Pressure Switches ...-307, ...-217

Step 1: Turn setting spindle I fully CCW until
end-stop. Turn setting spindle II fully CW
until end-stop. The smallest switching
interval has now been set.

Step 2: Set setpoint spindle S to a value on
the scale which is halfway between the
desired upper and desired lower switching
point.

Step 3: With pressure applied, set pressure
level for desired lower switchpoint (check
with manometer), turn setting spindle I CW
until microswitch acts. Switching point I has
now been set.

Step 4: Set pressure to pressure level for
desired upper switchpoint (check with
manometer), turn setting spindle II CCW
until microswitch II acts. Switching point II
has now been set.

Step 5: If the required upper and lower
switching point cannot be obtained, adjust
setpoint spindle S in the necessary direction
and repeat the setting procedure as
described in steps 3 and 4 above.
27