Honeywell HON 512, User And Maintenance Manual

Page: 64 / 208

Malfunctions
HON 512 with HON 650 pilot user manual 64
Malfunction Possible causes Correction
Pilot: The diaphragm is defective Perform maintenance on the pilot
as specified in
Maintaining the pilot
(see page 102)
Filter: The filter is dirty Perform maintenance on the filter
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
Unstable outlet pressure
behavior (oscillations) Pilot: Excessive amplification Adjust the amplifying valve as
specified in
Adjusting the amplify-
ing valve (see page 59)
The actuator assembly is operating
in the reseating pressure range Check the design specifications;
contact the manufacturer if neces-
sary
The visual position indica-
tor is not working Position indicator: The magnetic
ring is jammed Perform maintenance on the
position indicator as specified in the
Maintenance (see page 65) section
Position indicator: The spring is
damaged or not in place Perform maintenance on the
position indicator as specified in the
Maintenance (see page 65) section