Druck PACE5000 User manual

Druck.com
PACE5000 / 6000
Pressure Automated Calibration Equipment
Instruction Manual

Copyright 2008 Baker Hughes Company.
English–PACE5000/6000 Instruction Manual | i
Introduction
The PACE5000/6000 are pneumatic pressure controllers. The PACE5000 contains one pressure
control module. The PACE6000 can contain up to two independent pressure control modules.
The color touch-screen displays the measured pressure and the status of the instrument. The
touch-screen enables selections and settings to be changed. The instrument can be operated
remotely through communication interfaces.
Safety
The manufacturer has designed this equipment to be safe when operated using the procedures
detailed in this manual. Do not use this equipment for any other purpose than that stated, the
protection provided by the equipment may be impaired.
This publication contains operating and safety instructions that must be followed to make sure of
safe operation and to maintain the equipment in a safe condition. The safety instructions are
either warnings or cautions issued to protect the user and the equipment from injury or damage.
Use qualified technicians* and good engineering practice for all procedures in this publication.
Pressure
Do not apply pressures greater than the maximum working pressure to the equipment.
Toxic Materials
There are no known toxic materials used in construction of this equipment.
Maintenance
The equipment must be maintained using the procedures in this publication. Further
manufacturer’s procedures should be done by an authorized service agents or the
manufacturer’s service departments.
Druck.com
Technical Advice
For technical advice contact the manufacturer.
WARNING Do not apply pressure greater than the maximum safe working
pressure.
* A qualified technician must have the necessary technical knowledge, documentation, special test equipment
and tools to carry out the required work on this equipment.

Copyright 2008 Baker Hughes Company.
ii | PACE5000/6000 Instruction Manual–English
Symbols
Symbol Description
This equipment meets the requirements of all relevant European safety directives. The
equipment carries the CE mark.
This symbol, on the equipment, indicates that the user should read the user manual.
This symbol, on the instrument, indicates that the user should refer to the user manual. This
symbol, in this manual, indicates a hazardous operation.
Ce symbole, sur l’instrument, indique que l'utilisateur doit consulter le manuel d’utilisation.
Ce symbole, dans le manuel, indique une situation dangereuse.
This symbol warns the user of the danger of electric shock.
Ce symbole alerte l’utilisateur sur le danger de choc électrique.
Do not dispose of this product as household waste. Use an approved organization that
collects and/or recycles waste electrical and electronic equipment. For more information,
contact one of these:
- Our customer service department: Druck.com
- Your local government office.
WARNING Turn off the source pressure(s) and carefully vent the pressure
lines before disconnecting or connecting the pressure lines. Proceed with care.
Only use equipment with the correct pressure rating.
Before applying pressure, examine all fittings and equipment for damage.
Replace all damaged fittings and equipment. Do not use any damaged fittings
and equipment.
Do not exceed the maximum working pressure of the instrument.
This equipment is not rated for oxygen use.
RISK OF ELECTRIC SHOCK The ground lead of the instrument must be
connected to the AC supply protective safety ground.
Isolate the power supply before making any electrical connections to the rear
panel.

Copyright 2008 Baker Hughes Company.
English–PACE5000/6000 Instruction Manual | iii
General Specification
Abbreviations
The following abbreviations are used in this manual. Abbreviations are the same in the singular
and plural.
Item Description
Display LCD: Color display with touch-screen.
Operating Temperature 10°C to 50°C (50°F to 122°F)
Storage Temperature -20°C to 70°C (-4°F to 158°F)
Ingress Protection IP20 (EN 60529)
Operating Humidity 5% to 95% RH (non-condensing)
Vibration MIL-PRF-28800 Type 2 class 5 style E/F
Operating Altitude Maximum 2000 metres (6560 ft)
EMC EN 61326
Electrical Safety EN 61010-1, UL 61010-1, CSA 22.2, No. 61010-1 and IEC 61010-1
Power Supply PACE 5000: Input range: 100 - 240 Vac, (50/60 Hz), 2 A, installation
category II, Fuse T2AH250V
PACE 6000: Input range: 100 - 120/200 - 240 Vac (50/60 Hz), 5A, installation
category II, Fuse T5AH250V
Pressure Safety Pressure Equipment Directive - Class: Sound Engineering Practice (SEP) for
group 2 fluids.
Pollution Degree 2
Operating Environment Indoor use only. Do not use in potentially explosive environments.
Abbreviation Description
a Absolute
ac Alternating Current
dc Direct current
DPI Digital Pressure Instrument
etc. And so on
e.g. For example
ft Foot
g Gauge
GPIB General purpose interface bus
H2O Water
Hg Mercury
Hz Hertz
IDOS Intelligent Digital Output Sensor (Druck product)
i.e. That is

Copyright 2008 Baker Hughes Company.
iv | PACE5000/6000 Instruction Manual–English
Associated Publications
The following table lists the Druck publications referenced in this manual:
IEEE 488 Institute of Electrical and Electronic Engineers standard 488 (for programmable devices
with a digital interface)
in Inch
kg kilogram
m Metre
mA milliampere
max Maximum
mbar millibar
min Minute or minimum
MSDS Material safety data sheet
MWP Maximum working pressure
NPT National Pipe Thread
Pa Pascal
PACE Pressure Automated Calibration Equipment
psi Pounds per square inch
REF Reference
RS-232 Serial communications standard
Rx Receive data
SCPI Standard Commands for Programmable Instruments
SELV Separated (or Safety) Extra Low Voltage
Tx Transmit data
UUT Unit Under Test
V Volts
°C Degrees Celsius
°F Degrees Fahrenheit
Publication Title
K0447 PACE 5000/6000 User Guide and Safety Instructions
K0476 Pressure Control Module User Guide and Safety Instructions
K0469 PACE Heritage Communications Manual
K0450 PACE Series Calibration Manual
K0472 PACE Series SCPI Manual
Abbreviation Description

Copyright 2008 Baker Hughes Company.
English–PACE5000/6000 Instruction Manual | v
Contents
1. Description 1
1.1 Introduction 1
2. Installation 3
2.1 Packaging 3
2.2 Packaging for Storage or Transportation 3
2.3 Preparation for Use 3
2.4 Connecting to PACE 3
2.4.1 Pressure Adaptors 4
2.4.2 Pressure Connection 5
2.5 Connecting to UUT 6
2.6 System 6
2.7 Supply Equipment 7
2.7.1 Pneumatic Connection Examples 8
2.8 Rack-mount Option 10
2.9 Power Connection 12
2.9.1 Pressure Control Module DC Power and Logic Input Connectors 12
2.10 Communication Connection 13
2.10.1 RS-232 Interface 13
2.10.2 IEEE 488 Interface 14
3. Operation 17
3.1 Preparation 17
3.2 Power-up Sequence 17
3.3 Measure Mode 19
3.3.1 Auto-Range 20
3.3.2 Controller Off – Increasing Set-point 20
3.3.3 Controller Off – Decreasing Set-point 21
3.3.4 Controller On – Increasing Set-point 21
3.3.5 Controller On – Decreasing Set-point 21
3.4 Control Mode 21
3.4.1 Controlling to a New Set-point 22
3.4.2 Effort Meter 23
3.4.3 Controlling to Ambient/Zero Pressure 23
3.5 Operation and Example Procedures 24
3.5.1 Introduction 24
3.5.2 Measure and Control Modes 24
3.5.3 Task 25
3.5.4 Divider 26
3.5.5 Divider Menu Structure 26
3.5.6 Preset 27
3.6 Global Setup Selections 28
3.6.1 Status Area Settings 29
3.7 Barometric Reference Option 30
3.8 Supervisor Setup 31
3.9 Instrument Status 32
3.9.1 Software 33

Copyright 2008 Baker Hughes Company.
vi | PACE5000/6000 Instruction Manual–English
4. Maintenance 35
4.1 Introduction 35
4.2 Visual Inspection 35
4.3 Cleaning 35
4.4 Test 35
4.5 Software Update 35
4.6 Replacement Parts 37
4.6.1 Fuse Replacement 37
4.6.2 Pressure Control Module Filters 38
4.6.3 Pressure Control Module Replacement 39
5. Testing and Fault Finding 41
5.1 Introduction 41
5.2 Standard Serviceability Test 41
5.3 Fault Finding 42
5.4 Approved Service Agents 42
6. Reference 43
6.1 Installation Notes 43
6.1.1 Gas Supply 43
6.1.2 Supply Conditioning Equipment 43
6.1.3 Maximum Working Pressure 43
6.1.4 Supply Contamination 43
6.1.5 Systems without a Negative Supply 44
6.1.6 General 44
6.1.7 Operating Near Atmospheric Pressure or Below 44
6.1.8 Vacuum Pump 44
6.2 Operational Requirements 44
6.2.1 Negative or Vacuum Supply 44
6.2.2 Oil Contamination 45
6.2.3 Pump Performance 45
6.2.4 Venting 45
6.2.5 Vent 45
6.2.6 Zero 45
6.2.7 Output Port 45
6.2.8 Reference Port 45
6.3 Measure Setup 46
6.3.1 Pressure Zero 46
6.3.2 Process 46
6.3.3 Task 46
6.3.4 Units 46
6.3.5 Global Setup 46
6.3.6 Setup Zero 46
6.4 Control Setup 47
6.4.1 Vent 47
6.4.2 Nudge 47
6.4.3 Set-point Limits 47
6.4.4 Slew Rate 47
6.4.5 Control Mode 47
6.4.6 Active Control 47
6.4.7 Passive Control 47

Copyright 2008 Baker Hughes Company.
English–PACE5000/6000 Instruction Manual | vii
6.4.8 Zero Gauge Control 47
6.5 Global Setup 47
6.6 Status 48
6.7 Vent Setup 48
6.8 Global Setup 48
6.8.1 Supervisor Setup 48
6.8.2 Calibration 48
6.8.3 Save/Recall user setup. 48
6.8.4 Display 48
6.9 Supervisor Setup 49
6.9.1 Protective Vent 49
6.9.2 In-Limits 49
6.9.3 Alarms 49
6.9.4 Communications 49
6.9.5 Timeout 56
6.9.6 Idle Timeout 56
6.9.7 Gas Head Correction 56
6.9.8 Lock Tasks 56
6.9.9 Change PIN 56
6.9.10 User Defined Units 56
6.9.11 Instrument Alias Name 57
6.9.12 Language 57
6.9.13 Restore as Shipped Settings 58
6.10 Option Enable Process 58
6.11 Leak Test Option 59
6.12 Switch Test Option 61
6.12.1 Start 61
6.12.2 Test 62
6.12.3 End 62
6.12.4 Procedure 62
6.13 Test Program Option 62
6.13.1 Creating a Test Program 63
6.13.2 Editing an Existing Test Program 63
6.13.3 Running a Test Program 63
6.13.4 Copying a Test Program 63
6.13.5 Example Program 65
6.13.6 Programming Loops 66
6.14 Barometric Reference Option 67
6.14.1 Zeroing the Reference Sensor 69
6.15 Aeronautical Option 71
6.15.1 Leak Testing 71
6.15.2 Aeronautical Testing 71
6.15.3 Example of Altitude and Airspeed Testing 72
6.15.4 Units 72
6.15.5 Reference Pressure 73
6.15.6 Go to Ground 73
6.15.7 Control of Aeronautical Parameters 74
6.16 Analog Output Option 76
6.17 Volts-free Contact Option 77
6.18 Burst Pressure Testing Option 77
6.18.1 Selecting Burst Pressure Task 78
6.18.2 Test Parameter Entry 78
6.18.3 Example Burst Pressure Test 80

Copyright 2008 Baker Hughes Company.
viii | PACE5000/6000 Instruction Manual–English
6.19 Calibration 80
6.20 Communications - Instrument Emulation 81
6.21 Specification 81
6.22 Return Goods/Material Procedure 81
6.22.1 Safety Precautions 81
6.23 Packaging Procedure 81
6.24 Vacuum System Parts 82
Appendix A. Pressure Units and Conversion Factors 83
Appendix B. Air Density 85
Appendix C. User Interface Icons 87

Copyright 2008 Baker Hughes Company.
English–PACE5000/6000 Instruction Manual | 1
Introduction
1. Description
1.1 Introduction
The PACE5000 single-channel and PACE6000 single/dual-channel, Pressure Automated
Calibration Equipment measures and controls pneumatic pressures and displays, on a touch-
screen, the pressure measurement and controller status. The touch-screen enables selections
and settings in both measure and control modes. The instrument can be operated remotely
through communication interfaces.
Figure 1-1: PACE5000 General View
Figure 1-2: PACE6000 General View
The rear of the instrument houses all the electrical and pneumatic output and input connections.
The electrical connections provide an AC power supply, serial and parallel communication
interfaces, DC output and Logic input and output. The system pneumatic controller module
contains a positive and negative pressure supply port, an output port, vent port and reference
port.
The instrument can be used as follows:
• Free-standing instrument positioned on a horizontal surface.
• Rack-mounted in a standard 19 inch rack using the rack-mount option kit.

Copyright 2008 Baker Hughes Company.
2 | PACE5000/6000 Instruction Manual–English
Chapter 1. Description
Figure 1-3: PACE5000 Rear View
Figure 1-4: PACE6000 Rear View
Options available are detailed in the product Data Sheet.
For information and notes on applications, refer to Section 6, “Reference,” on page 43 or
Druck.com.

Copyright 2008 Baker Hughes Company.
English–PACE5000/6000 Instruction Manual | 3
Packaging
2. Installation
2.1 Packaging
Check that the PACE5000/6000 packaging contains the following:
1. PACE5000 or PACE6000 Pressure Controller.
2. Power supply cable.
3. Safety instructions, instruction manual and CD-ROM containing the full documentation suite.
4. Pressure Control Module blanking plate. Keep this plate for future use.
2.2 Packaging for Storage or Transportation
To store or return the instrument for calibration/repair:
1. Pack the instrument. Refer to Section 6.23, “Packaging Procedure,” on page 81.
2. Return the instrument for calibration/repair complete the return goods procedure. Refer to
Section 6.22, “Return Goods/Material Procedure,” on page 81.
Note: The procedure above applies to the pressure control module as a separate item.
2.3 Preparation for Use
The instrument can be positioned in the following ways:
• Free-standing instrument positioned on a horizontal surface.
• Rack-mounted in a standard 19 inch rack using the rack-mount option kit. Refer to
Section 2.8, “Rack-mount Option,” on page 10.
For free-standing instruments, the feet on the front of the base can be used elevate the
instrument to a better viewing angle.
Note: Do not obstruct the air cooling outlet on the underside of the instrument. Allow a free flow
of air around the instrument, especially at high ambient temperatures.
2.4 Connecting to PACE
INFORMATION After unpacking a cold instrument, allow time for it to
stabilize and any condensation to evaporate.
INFORMATION After removing a pressure control module, fit a blanking
plate to the PACE chassis to protect the unit and to keep the flow of cooling air.
WARNING Turn off the source pressure(s) and carefully vent the pressure
lines before disconnecting or connecting the pressure lines. Proceed with care.
Only use equipment with the correct pressure rating.
Before applying pressure, examine all fittings and equipment for damage.
Replace all damaged fittings and equipment. Do not use any damaged fittings
and equipment.
Do not exceed the maximum working pressure of the instrument.
This equipment is not rated for oxygen use.

Copyright 2008 Baker Hughes Company.
4 | PACE5000/6000 Instruction Manual–English
Chapter 2. Installation
2.4.1 Pressure Adaptors
Figure 2-1 shows the available range of PACE pressure adaptors.
Figure 2-1: Pressure Adaptors
Refer to Table 2-1 and the Data Sheet for more information.
Table 2-1: Pressure Adaptor Specification
Adaptor Part Number Specification
IO-SNUBBER-1 Restrictor/Snubber
IO-DIFFUSER-1 Diffuser
IO-ADAPT-1/4NPT ISO 228 G1/8 Male to 1/4 NPT Female.
IO-ADAPT-1/8NPT ISO 228 G1/8 Male to 1/8 NPT Female.
IO-ADAPT-7/16UNF ISO 228 G1/8 Male to 7/16-20 UNF Female.
IO-ADAPT-AN4 ISO 228 G1/8 Male to AN4 37° Male.
IO-ADAPT-AN6 ISO 228 G1/8 Male to AN6 37° Male.
IO-ADAPT-BARB ISO 228 G1/8 Male to 1/4 Hose.
IO-ADAPT-G1/4 ISO 228 G1/8 Male to ISO 228 G1/4 Female.
IO-ADAPT-G1/8 ISO 228 G1/8 Male to ISO 228 G1/8 Female.
IO-SNUBBER-1 IO-DIFFUSER-1
IO-ADAPT-G1/4
IO-ADAPT-1/8NPT
IO-ADAPT-1/4NPT
IO-ADAPT-7/16UNF
IO-ADAPT-AN4
IO-ADAPT-AN6
IO-ADAPT-BARB
IO-ADAPT-G1/8

Copyright 2008 Baker Hughes Company.
English–PACE5000/6000 Instruction Manual | 5
Connecting to PACE
2.4.2 Pressure Connection
The PACE has parallel thread pressure connectors. Use only the connector type specified in
Table 2-2.
Refer to Figure 2-2 for connection to the PACE pressure connectors.
Figure 2-2: PACE Pressure Connection
WARNING Parallel threads must be used. Female thread type is parallel
thread to ISO228/1 (DIN ISO228/1, JIS B0202) G1/8.
Tapered threads not allowed.
Table 2-2: PACE Pressure Connector Thread Specification
PACE Connector Thread Specification
Supply +, Supply -, Output,
Vent, Reference
ISO228/1 G1/8 Parallel Threads (DIN ISO228/1, JIS B0202)
1 PACE pressure connector. 2 Bonded seal.
3 ISO228/1 G1/8 pressure connector. 4 NPT thread pressure connector.
5 Pressure adaptor, see Section 2.4.1.
1
1
3
4
45
1
2
2

Copyright 2008 Baker Hughes Company.
6 | PACE5000/6000 Instruction Manual–English
Chapter 2. Installation
For pressures less than 100 bar (1450 psi), see alternative sealing method in Figure 2-3.
Figure 2-3: Alternative Sealing Method for < 100 bar (1450 psi)
2.5 Connecting to UUT
The pressure should not exceed 1.25 x full-scale or MWP stated on the rear panel of the
instrument.
To protect the instrument from over-pressure, fit a suitable protection device such as a relief valve
or bursting disc.
1. Switch off the power supply before connecting or disconnecting the instrument.
2. Use the appropriate sealing method for all pressure connections. Refer to Section 2.4.2 on
page 5.
3. Isolate the pneumatic pressures and de-pressurize the pipes (tubes) before connecting or
disconnecting the instrument.
4. Make sure the user systems can be isolated and vented.
5. The pneumatic gas must be clean and dry, nitrogen or air. Refer to specification in the Data
Sheet.
6. Connect pressure and vacuum supplies to the SUPPLY + and SUPPLY - connection ports.
7. Connect the Unit Under Test (UUT) to the appropriate connection port.
2.6 System
The safety of any system incorporating the equipment is the responsibility of the assembler of the
system.
The instrument requires a positive pressure supply. Instruments operating in an absolute range
or negative pressure range require a vacuum supply.
A vacuum supply should be used for a fast response for instruments operating near atmospheric
pressure.
1 PACE pressure connector.
2 Bonded seal.
3 ISO228/1 G1/8 pressure connector or adaptor. For
adaptors, see Section 2.4.1.
CAUTION Do not exceed the maximum pressures stated in the appropriate
component manual for the unit under test.
Reduce pressure at a controlled rate when venting to atmosphere.
Carefully de-pressurize all pipes (tubes) to atmospheric pressure before
disconnecting and connecting to the unit under test.
1
3
2

Copyright 2008 Baker Hughes Company.
English–PACE5000/6000 Instruction Manual | 7
Supply Equipment
For dual channel operation, two independent pressure and vacuum supplies can be used
Figure 2-4: Control Module Rear View
When using two pressure control modules:
• The control module with the highest pressure rating is fitted to the right hand side. This is
labeled as Module 1 as viewed from the rear of the product. Refer to Figure 2-4.
• If two control modules have the same pressure rating, the control module with the higher
serial number is fitted to the right hand side. This is labeled as Module 1 as viewed from the
rear of the product. Refer to Figure 2-4.
All pneumatic connections must comply with the Pressure Equipment Directive (PED) or
equivalent regional pressure standard.
When connecting the output ports of two pressure control modules together make sure both are
either:
• ≤ 70 bar (1000 psi)
OR
• between 100 to 210 bar (1450 to 3000 psi).
To prevent over-pressurization of pneumatic parts and maintain compliance with the PED, do not
connect the output of modules with range of 70 bar (1000 psi) and below to modules with range
above 70 bar (1000 psi), e.g. 100 bar (1450 psi) and 210 bar (3000 psi) modules.
2.7 Supply Equipment
Pneumatic supplies should have isolation valves and, where necessary, conditioning equipment.
The positive pressure supply should be regulated to between 110% of the full-scale pressure
range and MWP stated on the control module.
To protect the instrument from over-pressure a suitable protection device (such as a relief valve
or bursting disc) must be fitted to prevent over pressurization.
On instruments without a negative supply, the positive pressure discharges from the system to
atmosphere through the negative supply port. Pipe the negative port to a safe discharge area, or
fit a diffuser to the negative port.
During system pressure vent operations, the pressure discharges from the system to atmosphere
through the negative and vent ports. Pipe both ports to a safe discharge area or fit a diffuser to
the negative port.

Copyright 2008 Baker Hughes Company.
8 | PACE5000/6000 Instruction Manual–English
Chapter 2. Installation
2.7.1 Pneumatic Connection Examples
The following notes apply to the connection examples:
2.7.1.1 Pneumatic Connections without Vacuum Supply
The examples below show a single channel connection detail, using supply equipment described
above.
Figure 2-5: Pneumatic Connections without Vacuum Supply
Note: Refer to Section 6, “Reference,” on page 43 for details of other system components.
Note Description
*High pressure gas exhaust - depending on pressure range.
** Optional vacuum system kit, allows the -ve port gas to be directly discharged to
atmosphere, by-passing the vacuum pump.
†
Optimum controller transient response and minimum time to set-point may be
degraded if either the pneumatic supply or vacuum system has restricted flow.
Installing a reservoir volume, which has a larger capacity than the load volume,
located in close proximity to the controller supply ports can improve the controller
response.
‡Optional negative gauge pressure generator kit.

For ranges of 70 bar (1000 psi) and above, fit a suitable protection device to prevent
overpressure. For example, fit a relief valve or bursting disc. The protection device
must limit the applied pressure to below the MWP.
Optional differential connection kit.
1 Pressure source 2 Conditioner
3 Filter 4 Regulate to between 110% full-scale and
MWP
5 Diffuser * 6 Unit under test
7 Optional reservoir † 8 Protection device 
9 Optional differential connection 14 Manual external vent valves
a Atmosphere
OUTPUT
12
3
4
5
6
7
+
5
9
a
-
SUPPLY VENT REF
8
14
14

Copyright 2008 Baker Hughes Company.
English–PACE5000/6000 Instruction Manual | 9
Supply Equipment
2.7.1.2 Pneumatic Connections with Vacuum Supply
Figure 2-6: Pneumatic Connections with Vacuum Supply
Note: PACE option IO-VAC-SYS Vacuum System Check Valve Kit should be used in the vacuum
line. Mount near to the PACE CM -ve port to exhaust most of the high pressure gas directly to
atmosphere. The vacuum buffer volume needs to be rated to at least the highest system
pressure.
Note: Section 6, “Reference,” on page 43 for details of other system components.
1 Pressure source 2 Conditioner
3 Filter 4 Regulate to between 110% full-scale and
MWP
5 Diffuser * 6 Unit under test
7 Optional reservoir † 8 Protection device 
9 Optional differential connection 10 Oil mist trap
11 Vacuum source 12 Normally open electrical release valve
13 Check valve ** 14 Manual external vent valves
a Atmosphere
12
3
4
5
6
7
8
9
13
7
10
12
11
a
OUTPUT
+-
SUPPLY VENT REF
14
14

Copyright 2008 Baker Hughes Company.
10 | PACE5000/6000 Instruction Manual–English
Chapter 2. Installation
2.7.1.3 Pneumatic Connections with Negative Gauge Pressure Generator
Figure 2-7: Pneumatic Connections with Negative Gauge Pressure Generator
Note: Section 6, “Reference,” on page 43 for details of other system components.
2.8 Rack-mount Option
There must be enough space at the rear of the instrument for all the cables and pipes (tubes).
The length of the cables and pipes (tubes) must allow for the removal and installation of the
1 Pressure source 2 Conditioner
3 Filter 4 Regulate to between 110% full-scale and
MWP
5 Diffuser * 6 Unit under test
7 Optional reservoir † 8 Protection device 
9 Optional differential connection 10 Vacuum generator ‡
11 Source pressure (regulated compressed air
supply)
12 Exhaust to atmosphere
13 Check valve ** 14 Manual external vent valves
a Atmosphere
12
3
47
8
5
6
9
13
7
15
17
16
OUTPUT
+-
SUPPLY VENT REF
a
14
14