Honeywell HON 380 User And Maintenance Instructions page 42

Purging the lines with
nitrogen
Protecting the pipe
connections from
being twisted
Removing compo-
nents
HON 380 gas pressure regulator with HON 673/674 controller
All the gas pressure regulator's lines must be purged with nitrogen before the de-
vice is removed.
When conducting work involving the pipework, please always observe the follow-
ing:
Figure
If ...
You want to perform maintenance on the
regulator unit only
You want to perform maintenance on the
controller only
You want to perform maintenance on both
the regulator unit and the controller
Description
Do not twist the pipe connections in the assem-
blies.
Use a second spanner wrench for securing
when loosening and tightening pipe joints.
then ...
 The measuring line and the vent line on
the regulator unit must be removed.
 The regulator must be removed from the
gas pressure regulator body.
 The gas pressure regulator, including the
pipes, can remain in the gas regulating
line.
 The measuring line and the vent line on
the controller must be removed.
 The controller must be removed from the
gas pressure regulator body.
 The gas pressure regulator can remain in
the gas regulating line.
 The measuring line and the vent line on
the regulator unit and on the controller
must be removed.
 The regulator unit and the controller
must be removed from the gas pressure
regulator body.
 The gas pressure regulator, including the
pipes, can remain in the gas regulating
line.
Maintenance
42