Honeywell HON 512, User And Maintenance Manual

Page: 63 / 208

Malfunctions
HON 512 with HON 650 pilot user manual 63
Malfunction Possible causes Correction
The actuator assembly is
opening/closing too slowly Pilot: Not enough amplification Adjust the pilot as specified in
Maintaining the pilot (see page
102)
Pilot: The filter is dirty Clean the filter insert as specified in
the
Maintaining the filter section in
Maintaining the pilot (see page
102)
Actuator assembly: The diaphragm
is defective Perform maintenance on the
actuator assembly as specified in
the
Maintenance (see page 65)
section
Actuator assembly: The sleeve is
getting jammed Perform maintenance on the
actuator assembly as specified in
the
Maintenance (see page 65)
section
Leaks on the outside The flange gaskets are damaged or
are not in place Use new flange gaskets
Gas pressure regulator: The gaskets
are damaged or are not in place Perform maintenance as specified
in the
Maintenance (see page 65)
section
Screws not tightened enough Check that all screws have the right
tightening torque as specified in the
tables in the
Maintenance (see
page 65) section
The actuator assembly will
not close Pilot: Faulty amplifying valve Perform maintenance on the pilot
as specified in
Maintaining the pilot
(see page 102)
Pilot: Motorization pressure too
high Check the pilot spring to make sure
it is set correctly and is not dam-
aged as specified in
Maintaining
the pilot (see page 102)
Adjust the control stage’s setpoint
as specified in Adjusting the control
stage setpoint (see page 57)
Actuator assembly: The compres-
sion spring is faulty Perform maintenance on the
actuator assembly as specified in
the
Maintenance (see page 65)
section
Actuator assembly: The valve
sleeve is jammed Perform maintenance on the
actuator assembly as specified in
the
Maintenance (see page 65)
section
Leaks on the inside of the
actuator assembly in the
“closed” position
Actuator assembly: The valve disc is
damaged Perform maintenance on the
actuator assembly as specified in
the
Maintenance (see page 65)
section
Actuator assembly: The sleeve’s
sealing edge is damaged
Perform maintenance on the
actuator assembly as specified in
the
Maintenance (see page 65)
section
All the reasons why the actuator
assembly is not closing See above
Sudden outlet pressure
drop Pilot: Not enough amplification Perform maintenance on the pilot
as specified in
Maintaining the pilot
(see page 102)