Honeywell HON 670 Guide

HON 670 / HON 671
Controllers
Component documentation,
Maintenance manual and spare parts

Contents
HON 670 / HON 671 Controllers Component Documentation 2
Contents
1General considerations 3
1.1 About this component documentation 3
1.2 About the safety notices 5
2Description 6
2.1 Intended use 6
2.2 Device models 7
2.3 Labels/Markings 7
2.4 Physical design and operation 9
2.5 Technical specifications 13
3Safety 15
3.1 Basic safety rules 15
3.2 Requirements concerning the workforce, personal protective gear, workplaces 16
4Maintenance 17
4.1 Maintenance schedule 17
4.2 Preparing for the maintenance 17
4.3 Removing the pressure unit from the controller 18
4.4 Maintenance on the controller with diaphragm measuring unit 19
4.5 Maintenance on the controller with metal bellows measuring unit 27
4.6 Maintenance on the pressure unit 35
4.7 Mounting the pressure unit on the controller 38
4.8 Completing the maintenance 38
5Storage and disposal 39
5.1 Storing the device 39
5.2 Disposing of the device 40
6Appendix 41
6.1 Re-engage differential 41
6.2 Additional information regarding spare parts 42
6.3 K16, K17, K18, K19: Spare parts drawing for baseplate and connections 44
6.4 K16: Spare parts drawing for diaphragm measuring unit 45
6.5 K16: Spare parts drawing for diaphragm measuring unit with ball guide sleeve 48
6.6 K17: Spare parts drawing for diaphragm measuring unit 51
6.7 K17: Spare parts drawing for diaphragm measuring unit with ball guide sleeve 53
6.8 K18: Spare parts drawing for metal bellows measuring unit 55
6.9 K19: Spare parts drawing for metal bellows measuring unit 58
6.10 K16, K17, K18, K19: Spare parts drawing for pressure unit 60
6.11 Maintenance and servicing parts for the controllers 60
6.12 Lubricants, threadlockers, and special tools 65

General considerations
HON 670 / HON 671 Controllers Component Documentation 3
1General considerations
Topic Page
About this component documentation 3
About the safety notices 5
1.1 About this component documentation
This component documentation applies for the controllers HON 670 / HON 671.
This component documentation provides all individuals with the information required in
order to safely handle the device in connection with the following tasks:
▪Maintenance and servicing
▪Storage and disposal
This component documentation is intended for anyone who requires the following infor-
mation concerning the product:
▪Intended use
▪Device models
▪Technical specifications
▪How it works
▪Maintenance manual
▪Spare parts drawings and spare parts lists
Honeywell offers products with identical functions in a number of different sizes. For this
reason, we are unable to guarantee that the illustrations in this documentation will match the
dimensions of your product. In these cases, the illustrations should be viewed as a concept
sketch.
Failing to observe the information provided in this document may lead to injuries, including
death and material damages.
To ensure the safety, any persons handling the product must have read and understood the
following parts of this document before they start with any work involving it:
▪the chapter entitled Safety
▪the chapters that describe the work to be done
Unless explicitly permitted, the disclosure as well as duplication of this document, the exploi-
tation and communication of its contents are prohibited. Any breach or infringement will
result in liability for damages. All rights reserved in the event of patent, utility model or
registered design registration.
Contents
Validity and purpose
Target group
Illustration
Safety
Copyright notice

General considerations
HON 670 / HON 671 Controllers Component Documentation 4
© Copyright 2021 by
Honeywell Process Solutions
Honeywell Gas Technologies GmbH
Osterholzstraße 45
34123 Kassel
GERMANY
Tel: [phone]
Phone number for service: [phone]
Fax: [phone]
Fax number for service: [phone]
E-mail: [e-mail]
Website:
www.honeywellprocess.com
www.hongastec.de
Printed in Germany
The manufacturer will not be liable for damages and malfunctions arising from failure to
observe this component documentation and other applicable documents.
The written approval from Honeywell Gas Technologies GmbH, Kassel, is required for any
modifications and additions to the product. Any violation will void the legal liability for con-
sequences arising thereof.
Copyright
Details about the manu-
facturer’s liability
Constructive changes

General considerations
HON 670 / HON 671 Controllers Component Documentation 5
1.2 About the safety notices
The information contained in the safety notices is intended to prevent personal injury. Safety
notices contain the following information:
▪Nature and source of the danger
▪Possible consequences associated with the non-observance of the notice
▪Procedures for the prevention of personal injury
This document contains the following types of safety notices:
Type of safety notice
Description
Sign
Basic safety notices
Superordinate safety notices not relating to a
specific task:
▪They contain a summarized description of
hazards, risks and safety procedures associ-
ated with the handling of the device.
▪Their purpose is to inform and educate the
user about an existing danger and about
practicing behavioral safety.
▪They are suitable as safety instruction for all
employees handling the device.
Recognizable by the heading
of the chapter
Instruction-related
safety notices
Safety notices containing specific instructions
relating to the entire manual or a group of
manuals
Step-related safety
notices
Safety notices containing specific instructions
relating only to the step
DANGER
WARNING
CAUTION
Additional safety
notice
Instruction to observe certain safety notices
with reference to a location in the document
where safety notices containing specific
information about dangers, risks and specific
instructions for safety procedures can be found
The safety notices containing specific instructions are identified with a signal word. The signal
word represents a certain danger level:
Danger level
If you fail to follow the instruction, then …
And the consequence is …
DANGER
an accident will happen
serious bodily injury or
death.
WARNING
an accident may happen
possible serious bodily
injury or death.
CAUTION
an accident may or will happen.
minor or moderate bodily
injury.
Warnings about possible material damages are identified with the word Attention in this
document.
Meaning
Types of safety notices
Danger levels
Warnings about material
damages

Description
HON 670 / HON 671 Controllers Component Documentation 6
2Description
Topic Page
Intended use 6
Device models 7
Labels/Markings 7
Physical design and operation 9
Technical specifications 13
2.1 Intended use
The controllers HON 670 / HON 671 are used to trigger safety equipment within a controlled
gas system.
The controllers can be used for neutral, non-aggressive gases and the gases specified in
DVWG Code of Practice G260.
Note: The device’s operating limits concerning the gas, the operating pressure, and the
operating temperature can be found either on the rating plate affixed to the device or in the
device’s technical specifications.
The use under different operating conditions must be coordinated in consultation with the
manufacturer.
The controllers HON670 / HON671, which conform to DIN EN 334 / DIN EN 14382, are in-
tended to be used for the following gas pressure regulators:
▪HON 372
▪HON 402
▪HON 408
▪HON 503
▪HON 512
▪HON 530
▪HON 703
▪HON 704
▪HON 711
▪HON 721
▪HON 5020
Please observe the following limitations of use:
▪Do not use the device for any media other than those mentioned in the intended use or
those discussed with and approved by the manufacturer.
▪Do not use the device in any installation position other than the one documented in
this component documentation.
▪Do not use the device against the direction of flow specified on the device and in the
component documentation.
▪When replacing defective parts, only use original spare parts or manufacturer-approved
standard parts.
▪Do not attempt to modify or remodel the device on your own.
Contents
Intended use
Limitations of use

Description
HON 670 / HON 671 Controllers Component Documentation 7
2.2 Device models
The configuration levels of the controllers HON 670 / HON 671 can be varied in some respects
using individual components.
The following individual components are always part of the device:
▪Spring adjuster of the pilot spring
▪Amplifying valve
▪Comparator stage
▪Base plate
▪Pressure unit
The following individual components are installed in some versions of the device:
▪Comparator stage
▪Diaphragm measuring unit
▪Diaphragm assembly with ball guide sleeve
▪Metal bellows measuring unit
The comparator stage as an individual component is executed in three models with different
designs in dependence on the control range (Wd) of the controller:
Series
Designfor upper response pres-
sure
Control range Wdso
Thread type
[bar]
[psi]
K16: Diaphragm measuring unit
0.8 - 20
11.6 - 290
HON 670
K16: Diaphragm assembly with ball
guide sleeve
10 - 40
145 - 580
Metric, imperial
K18: Metal bellows measuring unit
20 - 90
290 - 1305
Series
Design for lower response pres-
sure
Control range Wdsu
Thread type
[bar]
[psi]
K17: Diaphragm measuring unit
2.0 - 20
29 - 290
HON 671
K17: Diaphragm assembly with ball
guide sleeve
10 - 40
145 - 580
Metric
K19: Metal bellows measuring unit
20 - 90
290 - 1305
The designs that use the imperial system of measurement feature ports that conform to
Anglo-American thread standards and use inches as a unit.
The designs that use the metric system of measurement feature ports that conform to Euro-
pean thread standards and use metric units.
The technical specifications and the spare parts lists and spare parts drawings in the appendix
describe all the models of the HON 670 / HON 671 controllers.
The Maintenance section describes the controller using the example of the models with a
diaphragm measuring unit and a metal bellows measuring unit. It does not explicitly describe
every single version and design.
If you have trouble understanding the information in this documentation, contact the manu-
facturer without fail before starting any work on the device.
2.3 Labels/Markings
Variants of the controllers
HON 670 / HON 671
Controllers HON 670 /
HON 671 models
Versions and designs in
this component docu-
mentation
Illegible labels

Description
HON 670 / HON 671 Controllers Component Documentation 8
Illegible information on the device poses a risk of injury due to resulting erroneous opera-
tion, use, or installation.
Labels, as well as inscriptions and stamping on the device, can eventually become soiled or
otherwise unrecognizable to such an extent that users will not be warned effectively of
hazards and may be unable to follow required operating instructions. This will pose a risk of
injury.
Make sure to always keep all relevant labels in good condition so that they will be easily
legible.
Immediately replace damaged and missing labels.
Make sure you have the right component documentation for your device.
To identify your device, look at the nameplate.
Make sure that the conditions on site correlate with the information on the type plate and
the technical specifications.
Technical specifications
The monitoring device type plate locations are as follows:
Figure
No.
Description
1
Type plate onthe side of the monitoring
device
2
Additional type plate on the side of the
monitoring device
The details on the type plate have the following meaning:
Figure
No.
Description
1
Manufacturer ID
2
Manufacturer’s address
3
Type designation
4
Serial number
5
PS = Maximum allowable pressure
Identifying the device
Verifying the technical
specifications
Locating the monitoring
device’s type plates
Interpreting the type
plate on the monitoring
device

Description
HON 670 / HON 671 Controllers Component Documentation 9
The details on the additional type plate mean the following:
Figure
No.
Description
1
Specific adjustment range [bar]
Wdso = Excess pressure
2
Specific adjustment range [bar]
Wdso = Insufficient pressure
3
Setpoint to be set [bar]
pdso = Upper response pressure value
4
Setpoint to be set [bar]; see configuration
pdsu = Lower response pressure value
Small color-coded text labels must be used to mark the controller’s connection lines based on
what the lines are used for.
2.4 Physical design and operation
The controller is made up of the following individual components:
Figure
No.
Description
1
Spring adjuster
2
Pilot spring
3
Comparator stage with diaphragm meas-
uring unit
4
Amplifying valve
5
Base plate
Interpreting the addi-
tional type plate on the
monitoring device
Labels on connection
lines
Physical design of the
controllers K16 / K17

Description
HON 670 / HON 671 Controllers Component Documentation 10
The controller is made up of the following individual components:
Figure
No.
Description
1
Spring adjuster
2
Pilot spring
3
Ball guide sleeve
4
Comparator stage with diaphragm meas-
uring unit with ball guide sleeve
5
Amplifying valve
6
Base plate
The controller is made up of the following individual components:
Figure
No.
Description
1
Spring adjuster
2
Pilot spring
3
Ball guide sleeve
4
Amplifying valve
5
Comparator stage with metal bellows
measuring unit
6
Base plate
Physical design of the
controllers K16 / K17 with
ball guide sleeve
Physical design of the
controllers K18 / K19

Description
HON 670 / HON 671 Controllers Component Documentation 11
The pressure unit consists of the following individual components:
Figure
No.
Description
1
Piston
2
Controller connection
The controller features the following connections:
Figure
No.
Connection
Pipe connection
thread type
Metric
Imperial
1
Measuring line
E12L
1/2"
2
Vent line
E12L
1/2"
3
Pressure unit
E10L
3/8"
Physical design of the
pressure unit
Controller connection
lines

Description
HON 670 / HON 671 Controllers Component Documentation 12
Figure
No. /
color
Description
1
Vent line
2
Bleed line
3
Measuring line
Outlet pressure
Atmospheric pres-
sure
▪The pressure in the system to be safeguarded is guided into the controller via the
measuring line where it is applied to the upper side of the double diaphragm system
and compared with the reference variable that is specified using the setpoint adjusting
screw (force of the pilot spring).
▪In the normal operating state, the amplifying valve is closed. The downstream system
including the actuator of the SAV is pressureless.
▪When the upper or lower response pressure is reached, the amplifying valve opens.
▪Gas from the monitored system flows to the actuator of the safety shut-off valve.
▪The piston of the pressure unit is moved and triggers the SAV’s trip mechanism via the
piston rod.
▪The safety shut-off valve closes.
▪The pressure in the system to be safeguarded is guided into the controller via the
measuring line where it is applied to the upper side of the double diaphragm system
and compared with the reference variable that is specified using the setpoint adjusting
screw (force of the pilot spring).
▪In the normal operating state, the amplifying valve is closed. The pressures in the upper
and lower actuator chamber of the actuator assembly are equal.
▪When the monitored pressure reaches the set response pressure of the controller, the
amplifying valve opens.
▪The pressure in the actuator chamber below the driving piston is reduced.
▪The system pressure on the upper side of the actuator moves the sleeve against the
closing spring in the opening direction so that the blowdown procedure of the safety
relief valve is enabled.
▪If the monitored pressure then once again falls below the setpoint as adjusted, the am-
plifying valve closes and the pressure in the lower actuator chamber thus rises.
▪When the pressure between the upper and the lower actuator chamber has equalized,
the safety relief valve closes again on its own.
Functional diagram of the
controller
How the controller works
when the SAV responds
How the controller works
when the SBV responds

Description
HON 670 / HON 671 Controllers Component Documentation 13
2.5 Technical specifications
The following characteristic values apply to all control ranges:
Value
Max. inlet pressure pumax
100 bar
(1450 psi)
Temperature range
-20 to +60 °C
(-4 to +140 °F)
Materials
Case: Aluminum alloy
Internal parts: Al alloy, stainless steel
O-rings: rubber-like synthetic material
diaphragms: rubber-like synthetic material
Controller
Manual
Automatic for overpressure
[bar]
Response time
[sec.]
K16
Via manual actuator
0.8 - 40.00
0.1 - 0.3
K18
Via manual actuator
20.00 - 90.0
0.1 - 0.3
Controller
Manual
Automatic for underpressure
[bar]
Response time
[sec.]
K17
Via manual actuator
2.0 - 40.00
0.1 - 0.3
K19
Via manual actuator
20.00 - 90.0
0.1 - 0.3
The figure below shows the dimensions for the controller K16 / K17 for the control range
Wd=0.8 –40 bar:
Comparator stage: Diaphragm measuring unit and diaphragm measuring unit with ball guide sleeve
*) Stage with ball guide sleeve
Characteristic device
values and materials
Actuating mechanisms
for overpressure
Actuating mechanisms
for underpressure
Controller dimensions

Description
HON 670 / HON 671 Controllers Component Documentation 14
The figure below shows the dimensions for the controller K18 / K19 for the control range
Wd=20 –90 bar:
Comparator stage: Metal bellows measuring unit
Design
Controller
A
B
C
D
E
F
G
H
J
[mm]
SAV
K16 / K17
K16* / K17*
K18
26
26
60
100
100
131
195
260
340
60
60
60
75
75
85
50
50
60
20
20
18
SBV
K16
K18
26
60
100
131
40
37
195
340
60
60
75
85
50
60
38
38
*) Stage with ball guide sleeve
The properties of the gas conveyed through the controllers HON 670 / HON 671 must meet
the requirements specified by the DVGW German Technical and Scientific Association for Gas
and Water in the latest version of DVGW Code of Practice G 260 (A).
The device’s mechanical components do not contain any potential sources of ignition, and
accordingly do not fall under the scope of ATEX 95 (94/9/EC). The electrical components used
on the device meet all applicable ATEX requirements.
Dimensions:
Gas properties
ATEX specifications

Safety
HON 670 / HON 671 Controllers Component Documentation 15
3Safety
Topic Page
Basic safety rules 15
Requirements concerning the workforce, personal protective gear, workplaces 16
3.1 Basic safety rules
These rules are intended for any individuals handling the device.
These rules are designed to make sure that any individuals working with or on the device will
thoroughly familiarize themselves with the corresponding hazards and safety measures and
will observe the safety notices contained in this component documentation and on the
device. If you do not follow these rules, there is a risk of injury including death and material
damages.
Observe the following rules:
▪Read the chapter entitled Safety and the chapters relating to your responsibilities in
their entirety. It is vital that you have understood these contents.
▪Always keep this component documentation in the vicinity of the device so that you can
consult it when necessary.
▪Include this component documentation if you are transferring ownership of the device.
Observe the following rules:
▪Only individuals who meet the requirements set forth in this component documenta-
tion have permission to work with/on the device.
▪The device’s intended use includes its use in hazardous locations. All work with and on
the device must be carried out only after the presence of an explosive atmosphere has
been fully ruled out.
▪Only use the device for the intended purpose. Never use the device for any other, po-
tentially logical purposes.
▪Follow all the safety measures outlined in this component documentation and on the
device. In particular, wear the mandatory personal protective gear.
▪Do not modify the device in any way, e. g. by removing parts or adding unapproved
parts. In particular, you have no permission to modify or disable any safety contrivanc-
es.
▪When replacing defective parts, only use original spare parts or manufacturer-approved
standard parts.
Personnel must meet the following requirements:
▪All personnel must meet the requirements corresponding to their duties.
▪All personnel must read and understand this component documentation before work-
ing with/on the device.
▪All occupational health and safety regulations that apply in your country must be com-
plied with.
▪All personnel must be provided with the personal protective equipment required for
their work. This personal protective equipment must be in good condition at all times.
▪All personnel must wear the personal protective equipment required for their work.
Contents
Target group of these
rules
Purpose of these rules
How to use this compo-
nent documentation
Handling the device
Requirements concerning
the workforce

Safety
HON 670 / HON 671 Controllers Component Documentation 16
The device is designed and built such that the employees can work with it without being at
risk. In spite of all the precautions, accidents can happen under unfavorable circumstances.
Always consult the directives of your company concerning the protection of the workforce.
3.2 Requirements concerning the workforce, personal protective gear,
workplaces
Individuals tasked with handling the device must meet the following requirements:
Personnel
Responsibilities
Required qualification
Mechanical fitter
▪Mechanical removal and
installation
▪Maintenance and servicing
▪Professional training and experience
operating pressure equipment and
systems
▪Knowledge of the relevant standards
and regulations
▪Ability to identify and avoid dangers
autonomously
Any persons handling the device must be equipped with the following personal protective
gear:
Task
Required personal protective gear
Mechanical activities involved in mainte-
nance, storage, disposal
▪Safety boots with protection for electrostatic dis-
charge (ESD)
▪Safety gloves
To ensure the safe handling of the device, the personnel must remain at the workplaces
intended for performing their tasks.
The workplaces for performing the various tasks are at the following locations:
Task
Workplaces
▪Maintenance, repairs
▪Storage
▪Disposal
All around the device, depending on the task
Conduct in the event of
accidents
Requirements concerning
the workforce
Requirements for the
personal protective gear
Workplace requirements

Maintenance
HON 670 / HON 671 Controllers Component Documentation 17
4Maintenance
Topic Page
Maintenance schedule 17
Preparing for the maintenance 17
Removing the pressure unit from the controller 18
Maintenance on the controller with diaphragm measuring unit 19
Maintenance on the controller with metal bellows measuring unit 27
Maintenance on the pressure unit 35
Mounting the pressure unit on the controller 38
Completing the maintenance 38
4.1 Maintenance schedule
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.
4.2 Preparing for the maintenance
Proceed as follows:
Step
Description
Explanation
1
Have the maintenance
and servicing parts
ready
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 thatthey 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.
2
Preparing special tools
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.
Contents
Meaning
Maintenance schedule
Preparation work for
controller maintenance

Maintenance
HON 670 / HON 671 Controllers Component Documentation 18
Step
Description
Explanation
3
Have the required
lubricants and thread-
lockers ready
For specifications concerning the lubricants and threadlockers
that must be used, please refer to the sections of the same name
under Lubricants, threadlockers, and special tools (see page 65).
4
Removing the control-
ler from the actuator
assembly
WARNING! Riskof serious injury posed by pressurized compo-
nents moving in an uncontrolledmanner when handled improp-
erly. If not handled properly or in the event of a defect, gas can
escape from pressurized components under high pressure and
cause serious injuries and even death. Before you start working
on these components:
▪Close all connections leading to the gas-carrying line.
▪Establish a depressurized status. Residual amounts of energy
must be depressurized as well.
Before starting with the maintenance work, the controller must
be removed from the actuator assembly with which it operates.
For instructions on how to remove the controller, please refer to
the user manual for the relevant gas pressure regulator. Keep in
mind that it is always necessary to depressurize the actuator
assembly (including the controller) and purge all gas-conveying
lines with nitrogen before removal.
The maintenance described below uses the controller with a diaphragm measuring unit and
the controller with a metal bellows measuring unit as an example. Use the bills of materials to
make sure that you replace all the maintenance parts relevant to your specific device model
during maintenance.
4.3 Removing the pressure unit from the controller
Crush and impact hazard posed by components falling or toppling over accidentally.
When working with heavy components that have been removed or are yet to be installed,
injury may result if the components start moving in an uncontrolled manner, e.g., fall down
from the working surface or topple over.
Place removed components exclusively on level, horizontal working surfaces with enough
load-bearing capacity.
If necessary, secure removed components so that they will not fall or topple over.
Wear the required personal protective equipment.
Exercise caution when performing the relevant tasks.
Sample maintenance
instructions
Falling components

Maintenance
HON 670 / HON 671 Controllers Component Documentation 19
Observe the following cleaning instructions:
▪Before assembly, all parts must be cleaned in order to remove any foreign particles
(swarf) and soiling.
▪If screws, bolts, or washers are replaced with identical new parts, any oil on these new
parts must first be removed.
Proceed as follows:
Figure
Step
Description
1
Unscrew screw connections (1) and (2) to
disconnect the pipe connections.
Take off the pressure unit.
Proceed as follows:
Maintenance on the controller with diaphragm measuring unit (see page 19)
Maintenance on the controller with metal bellows measuring unit (see page 27)
Maintenance on the pressure unit (see page 35)
4.4 Maintenance on the controller with diaphragm measuring unit
Crush and impact hazard posed by components falling or toppling over accidentally.
When working with heavy components that have been removed or are yet to be installed,
injury may result if the components start moving in an uncontrolled manner, e.g., fall down
from the working surface or topple over.
Place removed components exclusively on level, horizontal working surfaces with enough
load-bearing capacity.
If necessary, secure removed components so that they will not fall or topple over.
Wear the required personal protective equipment.
Exercise caution when performing the relevant tasks.
Observe the following cleaning instructions:
▪Before assembly, all parts must be cleaned in order to remove any foreign particles
(swarf) and soiling.
▪If screws, bolts, or washers are replaced with identical new parts, any oil on these new
parts must first be removed.
Cleaning
Removing the pressure
unit from the controller
Next task
Falling components
Cleaning

Maintenance
HON 670 / HON 671 Controllers Component Documentation 20
Observe the tightening torques below when following the instructions in this section:
Part
Tightening torque
Step
Task
Screws of pilot spring
cover
12 Nm (9 ft lbs)
4
Replace the O-ring of the pilot
spring cover
Cap nut
20 Nm (15 ft lbs)
5
Assembling the double dia-
phragm system
Hex nut
20 Nm (15 ft lbs)
6
Assembling the double dia-
phragm system
Baseplate screws
12 Nm (9 ft lbs)
7
Mounting the controller
Screws of bottom cover
12 Nm (9 ft lbs)
8
Mounting the controller
Proceed as follows:
Figure
Step
Description
1
Unscrew the 4 screws (1) on the
baseplate.
2
Remove the baseplate (1).
3
Replace the 4 O-rings (1) with 4 new,
lubricated O-rings. Bear in mind that the
O-rings differ.
Note: See the appendix for the lubricants
to be used.
Tightening torques
Replace O-rings of the
baseplate