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4
Maintenance
Contents
4.1
Maintenance schedule
Meaning
Maintenance schedule
4.2
Preparing for the maintenance
Preparation work for
controller maintenance
HON 670 / HON 671 Controllers Component Documentation
Topic
Maintenance schedule
Preparing for the maintenance
Removing the pressure unit from the controller
Maintenance on the controller with diaphragm measuring unit
Maintenance on the controller with metal bellows measuring unit
Maintenance on the pressure unit
Mounting the pressure unit on the controller
Completing the maintenance
The maintenance schedule provides an overview of the periodically required maintenance.
Since the maintenance intervals are highly dependent on the operating conditions and the
gas quality, it is impossible to provide set maintenance intervals. It is recommended to use
maintenance intervals conforming to the specifications in DVGW Code of Practice G 495. In
addition, the need for maintenance must be determined and documented on the basis of
operational requirements and experience.
Maintenance must be carried out in compliance with all federal and state laws and regula-
tions, as well as with the local rules and regulations set forth by the relevant utilities and
authorities and any other applicable regulations.
Proceed as follows:
Step
Description
1
Have the maintenance
and servicing parts
ready
2
Preparing special tools
Explanation
Refer to the topic Explanation of spare parts to find out which
spare parts drawings belong to your device model and have the
corresponding maintenance and service parts ready before
starting maintenance.
▪ The spare parts that are always required for the controller's
maintenance are listed in the spare parts kits for the control-
ler.
▪ Spare part drawings and spare parts lists are listed in the
appendix (see page 41).
In addition to these maintenance parts, there are also servicing
parts that need to be checked during maintenance in order to
make sure that they are in working condition. Depending on
their condition, these must be replaced as needed.
Consequently, it is recommended that the required servicing
parts be kept on hand as per the section Servicing parts for
controllers in the topic Maintenance and servicing parts for HON
670_671 to prevent downtimes.
In addition to standard tools, have the special tools required for
your specific controller model ready to go before maintenance.
Please refer to the Special tools section in Lubricants, thread-
lockers, and special tools (see page 65).
You will also need a magnetic bowl for the maintenance of your
controller to enable removal of the balls of the guide sleeve.
Maintenance
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