<5. Maintenance>
5-2
IM 02M04B01-01EN
NOTE
• Controller is equipped with either a locally-
adjusted set point (set point knob, standard;
MC43-
N-N) or a remotely-adjusted
set point (pneumatic set, optional; MC43-
C-P).
• If controller is equipped with optional
automatic-manual transfer system (MC43-
C-P).
a. Amplifier is located as shown.
b. Air to automatic control system can be
turned off. If automatic control section
(amplifier, restrictor, control unit, etc.)
requires servicing, controller can be
operated manually.
• For component connection identifications,
refer to section 5.13.
5.3 To Clean Restrictor
Restrictor is screwed into base of amplifier.
F0504.ai
Location of amplifier
WITHOUT auto-man
transfer system.
Location of amplifier
WITH auto-man
transfer system.
1
1. Unscrew restrictor. (With restrictor at right, use
offset screwdriver).
2. Clean with O.D 0.13 mm wire.
3. Before reinstalling restrictor, apply a thin film of
Vaseline or similar lubricant to O-ring.
5.4 To Replace Pneumatic
Amplifier
1. To remove amplifier, remove two large screws
and pry off. A gasket is supplied with each
replacement amplifier.
2. Do not remove plate between amplifier and
manifold.
Illustrated is location of amplifier in controller
without auto-man transfer system; for other
amplifier location, see upper illustration.
5.5 To Replace Screens
3. If screens become clogged, pry out with a
pointed tool and replace.
NOTE
Filters are always located as shown regardless
of location of relay.
