Honeywell MP-953D Installation And Maintenance Manual page 3

AND ADJUSTMENT PROCEDURES FOR HONEYWELL MP-953B, MP-953D,
OR MP-953F PNEUMATIC OPERATORS USED ON ARNSTRONG HUMIDIFIERS
II. INSTALLING THE PNEUMATIC OPERATOR
After necessary repairs have been made, perform the
following steps to install the operator.
1. Press down the valve stem (16) so
that the valve is
closed.
2. If the stem nut (17) and stem
adapter (17A) were not removed 3-i/2"*
during
adjustment shown in Figure 2.
Adjust as required.
If the stem nut (17) and stem
adapter (17A) were removed during
repairs, turn them onto the stem
and adjust as shown in Figure 2.
Assemble the yoke assembly (36) and
3.
stem adapter (17A) in the following
manner.
c)
Place the operator over the yoke assembly (36) and
4.
lower the operator onto the bonnet (15).
5. Hold the operator to prevent it from turning.
screwdriver into the slot in the top of the yoke (36)
and turn counterclockwise until the operator base (26)
contacts the mating surface of the bonnet (15).
6. Tighten th.e two set screws (27).
Load the stem by turning the yoke (36) clockwise until
7.
the spring cup (28) is from l/16 to l/8 inch above the
operator base (26).
a.
Install the operator plug (35) in the top of the MP-
9530 or close the access plate on the top of the MP-
953B or MP-953F.
Turn on the steam to the humidifier.
Connect the air line to the operator and turn on the
10.
instrument air.
repairs,
Hold the bearing (36B) in the orientation shown in
Figure 1 (flat side down, depression up).
the bearing into the groove of the stem adapter
Place the spring (36C) on top of the stem adapter
pointed downward toward the notches in the sides
of the bearing.
Slide the yoke (36A) over the spring (36C),
bearing (36B), and stem adapter (17A) until the
short tabs of the spring snap into place on both
sides of the yoke.
(16)
l
Make any necessary adjustments.
completely
check the
*With valve in closed position
(36B) with the longer tabs
Center the yoke over the stem
(Dimension "A" in Figure 1).
2
---Stem
for
Operator
-Humidifier
Figure 2.
Slide
Insert a