Honeywell MAXON 4760 Series, Инструкция по эксплуатации, Страница: 9 / 12

E - i - 05/22 9 32M-95002-03
ACTUATOR ASSEMBLY ROTATION
WARNING
MAXON electro-mechanical valves should be
ordered in a configuration compatible with
planned piping. If valve orientation is not correct,
the actuator assembly can be rotated in 90°
increments around the valve body centerline axis
using the procedure below.
1. Shut off all electrical power and close off upstream
manual cock.
2. Remove terminal block cover plate and disconnect
power lead wires. (Tag carefully for later re-assembly.)
3. Remove conduit and electrical leads.
4. Note physical position of any signal switch actuator
wands on auxiliary signal switches.
5. Unscrew the two actuator bolts screwed up from the
bottom to 1/4 inch. DO NOT completely remove.
These bolts secure the valve body to the valve’s top
assembly housing.
6. Gently lift the top assembly (not more than 1/4” in
height); just enough to break the seal between the
valve body assembly and the rubber gasket adhering
to the bottom of the top housing.
WARNING
Lifting too far may dislodge some small parts
inside the top housing, requiring complex re-
assembly and retesting by trained factory
personnel.
7.
Remove the two actuator bolts screwed up from the
bottom (were partially unscrewed in step 5).
8.
Carefully rotate top assembly to the desired position in
a plane parallel to the top of the valve body casting.
Rotate the top housing about 30° beyond this posi -
tion, and then rotate it back. Reposition the top hous -
ing back down onto the valve body casting. This
should align the open/shut indicator with its window
and provide proper alignment of the internal mecha -
nism.
9.
Realign holes in valve body casting with the corre -
sponding tapped holes in the bottom of the top
assembly housing. Be sure the gasket is still in place
between the body and top housing.
10.
Reinsert the actuator bolts up from the bottom
through the body and carefully engage threads of the
top assembly. Tighten securely.
11.
Reconnect conduit and electrical leads, then check
that signal switch wands are properly positioned and
that the open/shut indicator moves freely. Failure to
correct any such misalignment can result in extensive
damage to the internal mechanism of your valve.
12. Energize valve and cycle several times from closed to
full open position. Also electrically trip the valve in a
partially opened position to prove valve operates prop -
erly.
13. Replace and secure terminal block cover plate and
place valve in service.
FIELD INSTALLATION OF VALVE
POSITION SWITCH
General
• Shut off fuel supply upstream of valve, then de-ener -
gize valve electrically.
• Remove terminal block and access cover to provide
access, being careful not to damage gaskets.
• Compare with illustrations below to identify your
valve type.
Replacement switches
• Note wand position and mounting hole location
carefully, then remove 2 screws and lift existing
switch.
• Install replacement switch in same mounting holes
on bracket and verify correct wand position.
• Replace existing wiring one connection at a time, fol -
lowing original route and placement.
Add switches
• Check illustrations below. If your valve uses a switch
mounting bracket as in Fig. 1 & 2, mount switches to
bracket using the mounting holes appropriate for
valve type and size. For high capacity valves, mount
switches on the support stand.
• Position bracket so VCS wand just touches top of
actuator, then move downward slightly, depressing
wand until switch clicks, then tighten mounting
screws to hold this position.
• Pin bracket by drilling 1/8” diameter holes 1/4” deep
into bracket mounting pad through drive pin holes,
then tap drive pin in until flush (not required for high
capacity valves).
• Route wires to wiring compartment as shown, then
complete wiring connections and clean out metal
drilling chips from previous procedure.
• Cycle valve, checking switch actuation points care -
fully. (VCS actuates at top of stem stroke, VOS at bot -
tom.) Simultaneously the valve body must be tested
for switch continuity and seat leakage. Bend VOS
switch wands slightly if necessary to insure valve is
opening fully.
• Replace covers, then return valve to service.