Concoa Medical IntelliSwitch 570 Series User manual

TM
ADI 9504-L
570 Series Medical
IntelliSwitch
Electronic
Switchover
INSTALLATION AND OPERATING INSTRUCTIONS
Carefully Read These Instructions Before Operating
Carefully Read These
Controls Corporation of America
1501 Harpers Road • Virginia Beach, VA 23454
Telephone [phone] or 757-422-8330 • Fax [phone]
www.concoa.com Jan 2017
Revision L

i
Index
Safety............................................................................................................................................ 2
User Responsibility ...................................................................................................................... 4
Installing the Medical IntelliSwitch™ ......................................................................................... 5
Description of Product.................................................................................................................. 9
Features ........................................................................................................................................ 9
Operating the Medical IntelliSwitch™....................................................................................... 12
User Selectable Features............................................................................................................. 13
Setting Switchover Pressure ................................................................................................ 13
Setting Delivery Regulator Pressure.................................................................................... 17
Setting Delivery Regulator Tolerance.................................................................................. 19
Setting Units of Measure ..................................................................................................... 20
Setting Keypad Security Lockout........................................................................................ 21
Connecting to a Remote Alarm............................................................................................ 22
Setting Remote Alarm Outputs............................................................................................ 24
Connecting to External Alarms............................................................................................ 27
Enabling Reserve Gas Supply.............................................................................................. 28
Enabling Remote Setup........................................................................................................ 29
Setting Communication Mode............................................................................................. 30
Trouble Shooting........................................................................................................................ 31
Error Codes................................................................................................................................. 32
Performing Self Test .................................................................................................................. 36
Mounting Detail ......................................................................................................................... 43
Power Requirements................................................................................................................... 44
Service........................................................................................................................................ 44
Self Test Worksheet ................................................................................................................... 45
Factory Default Settings............................................................................................................. 47
Fail Safe Settings........................................................................................................................ 48
Warranty..................................................................................................................................... 49

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2
SAFETY
THIS PRODUCT IS NOT INTENDED FOR USE WITH TOXIC GASES, FLAMMABLE
GASES OR CORROSIVE GASES.
NOTICE
The Medical IntelliSwitch™ is intended for use in medical installations. This product
meets NFPA-99 requirements for switchover systems. Compliance with NFPA-99 for
a complete installation (i.e. Cylinders, piping, alarms, etc.) is the responsibility of the
installer. Refer to NFPA-99 for complete system requirements.
Basic safety precautions must be followed to reduce the risk of fire, electrical shock or injury.
Connect the Medical IntelliSwitch™ to the correct line voltage. A label on the product
identifies what voltage it is wired for. CONNECTION TO AN INCORRECT VOLTAGE
CAN CAUSE SERIOUS DAMAGE TO THE PRODUCT AND WILL VOID ANY
WARRANTY.
While the Medical IntelliSwitch™ Switchover is dust and moisture resistant, it is NOT
water-proof or completely sealed. It should be installed where it will not be subjected to rain
or high concentrations of dust. Never pour or spray liquids directly onto the product.
Install the Medical IntelliSwitch™ where the ambient temperature range is between 0° F and
140° F.
Do not install this product in a hazardous environment.
If product appears damaged in any way, do not use and request service from CONCOA.
Consult the cylinder distributor for the proper use of cylinders and for any restrictions on
their use (such as flow rate and temperature requirements).
Store cylinders with valve caps screwed on, and chain cylinders to a supporting wall or
column.
Handle cylinders carefully and only with valve caps screwed on. The cap will reduce the
chance that the cylinder valve will break off if the cylinder is accidentally dropped or falls
over. The cap also protects the cylinder valve from damage to screw threads, which could
cause leaky connections.
No smoking should be permitted near oxygen, nitrous oxide, any other oxidizer, flammable
gases, or flammable mixtures, or in areas where cylinders are stored.

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Where an oxidizer (such as nitrous oxide or oxygen) is used, the manifold and cylinders
must be kept clean. No oil, grease, or combustible substances should come in contact with
oxygen or nitrous oxide storage or handling equipment. Such materials in contact with
oxygen or nitrous oxide are readily ignitable and, when ignited, will burn intensely.
Never lift gas cylinders with a magnetic lifting device.
Never use an open flame when leak testing.
Always open valves slowly when high-pressure gases are being used.
Always be sure that a cylinder contains the correct gas before connecting it to any manifold.
Always leak-test any manifold or distribution pipeline before using.
Always be sure that the gas in a pipeline is the correct gas for the intended use.
Always close all cylinder valves before disconnecting cylinders from a manifold.
Always remove all empty cylinders from a manifold before connecting full cylinders.
Always test cylinders to be sure the cylinders are full before connecting to a manifold.
All gas distribution piping systems must meet the appropriate standards for the intended service. For
the United States, some applicable safety rules and precautions are listed below:
1. N.F.P.A. Standard 99, Health Care Facilities
2. Local Ordinances
3. O.S.H.A. Standard 29 CFR
4. C.G.A. Pamphlet C-4, American National Standard Method of Marking Portable Compressed
Gas Containers to Identify the Material Contained.
5. C.G.A. Pamphlet G-4, Oxygen –Information on the properties, manufacture, transportation,
storage, handling, and use of oxygen.
6. C.G.A. Pamphlet G-4.1, Equipment Cleaned for oxygen service.
7. C.G.A. Pamphlet G-4.4, Industrial Practices for Gaseous Oxygen Transmission and Distribution
Piping Systems.
8. C.G.A. Pamphlet G-5, Hydrogen –Information on the properties, manufacture, transportation,
storage, handling, and use of hydrogen.
9. C.G.A. Pamphlet G-6, Carbon Dioxide –Information on the properties, manufacture,
transportation, storage, handling, and use of carbon dioxide.
10. C.G.A. Pamphlet G-6.1, Standard for Low Pressure Carbon Dioxide Systems at Consumer Sites.
11. C.G.A. Pamphlet P-1, Safe Handling of Compressed Gases in Containers.
12. C.G.A. Pamphlet P-2, Characteristics and Safe Handling of Medical Gases.
13. C.G.A. Pamphlet C-9, Standard Color Marking of Compressed Gas Containers for Medical Use.
14. C.G.A. Pamphlet M-1, Guide for Medical Gas Systems at Customer Sites
15. C.G.A. Pamphlet E-10, Maintenance of Medical Gas and Vacuum Systems in Health Care
Facilities.

4
16. C.G.A. Pamphlet G-7, Compressed Air for Human Respiration.
17. C.G.A. Pamphlet 9.1, Commodity Specification for Helium.
18. C.G.A. Pamphlet 10.1, Commodity Specification for Nitrogen.
19. C.G.A. Pamphlet SA-6, Safety Alert, Use of Nitrogen for Surgical Air Tools
20. C.G.A. Pamphlet SA-17, Safety Alert, Hazards of Nitrogen/Inert Gases Creating an Oxygen
Deficient Atmosphere
C.G.A. Pamphlets can be obtained from the Compressed Gas Association, 1235 Jefferson Davis
Highway, Arlington, VA 22202-3239, [phone]. Publications: [phone]. Fax: (703)
961-1831.
USER RESPONSIBILITY
Service to this product should only be performed by CONCOA or an authorized CONCOA agent.
Requests for service may be made through CONCOA CUSTOMER SERVICE at 1-800-225-0473.
Written requests may be made using CONCOA’s FAX number at 1-757-422-3125 or CONCOA’s
E-MAIL at [e-mail]
CONCOA accepts no responsibility for damage or injury if this product is modified in any way.
CONCOA assumes/accepts no liability or responsibility for damage to individuals or equipment that
may occur when using this product.

5
INSTALLING THE MEDICAL INTELLISWITCH™
Understanding the application and sizing the components properly is the key to any
successful system installation.
Check that the correct Medical IntelliSwitch has been selected for the application.
The Medical IntelliSwitch is shipped with “factory default” settings. Refer to the
Section “Factory Default Values” to determine how the system is configured.
Figure 1a shows examples of typical installations. Figure 1b shows locations and identification of
electrical connections and inlets and outlets.
The inlets, outlet, relief valve vent, and reserve gas port (option) on the Medical IntelliSwitch™ are
1/2” Female NPT fittings. These fittings have an anti-rotation plate around them to keep them from
twisting during installation. However, it is strongly recommended that two wrenches be used when
tightening external devices to these fittings.
DO NOT APPLY AC POWER TO THE MEDICAL INTELLISWITCH WITHOUT FIRST
APPLYING INLET PRESSURE TO IT.
1. The installation of the system requires that the vent for the relief valve exhaust be piped
away to a filtered, turned down port to avoid the entry of bugs and moisture.
2. Anchor the Medical IntelliSwitch™ securely to a wall or panel at a height adequate to
conveniently connect a manifold or pigtail. The Medical IntelliSwitch™ uses four
mounting tabs for mounting to a wall or panel. Refer to Figure 19 at the back of this
manual for the dimensions of the system. THE HEIGHT SELECTED MUST MEET
ALL REGULATORY REQUIREMENTS.
3. Make all mechanical connections (inlets, outlet, optional reserve) and pressurize the
system to check for leaks.
4. Connect the CONCOA Remote Alarm (if used) to the Medical IntelliSwitch™. If
connecting to the facility’s master alarm system the connection is made through one of
the two alarm output connectors on the bottom of the enclosure. Both connectors send
the same signals but are isolated from each other through different relay contacts. (Refer
to Section “Connecting to a Remote Alarm” for pinouts ).
5. If using the web server feature of the Medical IntelliSwitch make the connection from
the web server connector on the bottom of the enclosure to the facility’s LAN (local area
network). Refer to the Web Server Manual that was included with the product if this
option was purchased for details on setting up the web server features.
6. If using a CONCOA Reserve Gas System connect the alarm output cable from the
Reserve Gas System to the Medical IntelliSwitch.
7. Finally connect AC power to the Medical IntelliSwitch™. The system is factory set to
operate at 100-240 V 50/60Hz.

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Apply power to the Medical IntelliSwitch™. The inlet pressure readings will appear on the two
4-digit displays. If necessary use the Bank Select pushbutton to choose the side considered to be
the primary gas source. From the factory the Medical IntelliSwitch™ will default to the left inlet
side as the primary side. It will also default to the left delivery regulator.
8. Check the delivery pressure. The value will appear on the 3-digit display. Switch
between the two delivery regulators to check the pressure from each regulator using the
Output Source Pushbutton on the control panel. The delivery pressure is factory set.
Should it be necessary to change this value refer to the section “Setting the Delivery
Regulator Pressure”.
Normal operation of the Medical IntelliSwitch™ can now begin. The “primary” or “active” side of
the system, whether left or right, will have the green Ready light ON and the In-Use light ON over
the source pressure. The “secondary” side or the “in-active” side will have only the green Ready
light ON.
Lighted green lights above the Source Select buttons should match the types of cylinders being used
by each side.
All switching is automatic. If the primary inlet gas side drops below the set switchover point, the
system will transfer to the reserve inlet gas side and the status lights will indicate the transition. The
Replace status light and alarm indicate the need to replenish a bank. In the case of high pressure
cylinders, the system will reset when pressure has been restored to the depleted bank. In the case of
liquid cylinders, the system will reset when pressure has been restored to the depleted bank and the
Reset button has been depressed.
Delivery Regulator operation is similar to the inlet operation. A green In-Use light will light to the
left or right of the delivery pressure display indicating which delivery regulator is in use. There is a
delivery pressure tolerance feature designed into the product. It allows for the pressure to vary over
a programmed range before the product indicates an error condition. If the delivery regulator in use
has its pressure fall out of its programmed operating range the system will switch to the other
delivery regulator automatically. At this time the red Fault light will light indicating which delivery
regulator has a problem and the green In-Use light will light on the delivery regulator the system
switched to. The factory default delivery pressure tolerance is +/- 7 PSI.

7
Figure 1a

8
Figure 1b

9
DESCRIPTION OF PRODUCT
The Medical IntelliSwitch™ is a device used to monitor, control and switch the flow of gas from
cryogenic or high pressure cylinders from either of two independent sources to either of two
independently controlled and isolated delivery regulators. In turn these regulators are connected to a
single point of use output.
It consists of two electronically controlled inlet valves controlling the flow of gas into two
electronically controlled valves that in turn direct the flow of gas into one of two delivery regulators.
Pressure coming into the Medical IntelliSwitch™ is monitored and displayed on two independent 4-
digit displays. The outlet pressure of the system is monitored and displayed on a 3-digit display.
Outlet pressure adjustment is available using an adjusting screw on the delivery regulators inside the
cabinet.
A series of indicator lights show the status of the system at any given time.
The status of the Medical IntelliSwitch™ may be monitored remotely via a serial port or optional
Ethernet port. In addition, the Medical IntelliSwitch™ can interface with a CONCOA Remote
Alarm.
FEATURES
Operation from Multiple Gas Sources
The Medical IntelliSwitch™ is capable of operating with inlet pressure provided by 230, 350, and
500 PSI liquid cylinders, 3,000 PSI high pressure cylinders, or any combination.
Look Back
The Medical IntelliSwitch™ switches from one bank to the other based upon the pressure supplied
to the selected bank. When using liquid cylinders, if the volume of the liquid in the cylinder becomes
low or the gas flow becomes particularly high, it is not uncommon for the pressure to drop below the
switching point even if there is plenty of gas left in the cylinder. When a typical switchover enters
such a state, two undesirable situations may occur. First, the system may switch to the reserve
temporarily until pressure builds on the primary enough to cause the system to switch back. This
situation often leads to depleting both sides at the same time as the system rapidly alternates drawing
from both sides or even draws both sides at the same time. Second, the system may permanently
switch to the reserve leaving unused product in the primary and triggering a false alarm.
To avoid either of these situations, the Medical IntelliSwitch™ has a Look Back feature that allows
the system to switch banks and wait a predetermined time period before checking the former primary
cylinder. If the pressure has recovered enough, the system will switch back to the former primary
cylinder. This look back time allows the pressure building circuit to recover and build sufficient
pressure to supply the system and fully draw down the primary cylinder before an alarm is triggered
indicating the cylinder is empty, allowing maximum utilization of cylinder contents. This feature is
only activated when a liquid cylinder is selected for use. The look back time is factory set at 30
minutes.

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Switchback Delay
Using the Look Back feature alone can result in the switchover switching back several times well
after the cylinder can provide a useful gas supply. To prevent this, the Switchback Delay feature
keeps track of how often the Medical IntelliSwitch™ switches back to a liquid cylinder that has been
used and whose pressure has been restored to be used again.
If the system switches away from the priority side before the Switchback Delay timer has timed out,
the system determines that all the useful gas has been extracted from the cylinder and switches to the
auxiliary side and draws from it. This feature is only activated when a liquid cylinder is selected for
use. The switch back time is factory set at 10 minutes.
Hysteresis
This feature is a pressure value added to the switchover pressure value to determine the pressure at
which the Medical IntelliSwitch™ will switch back to a cylinder after the “Look Back” time has
expired. This feature provides added protection against inadvertently drawing from the reserve bank
when the primary still has gas. The Hysteresis pressure is factory set at 10 PSI.
Economizer Function
When using liquid cylinders in switchover applications, it is common for the reserve cylinder to
build pressure due to the vaporization of liquid within the cylinder. When this pressure reaches the
set point of the relief valve on the liquid cylinder, the relief valve will open, venting gas to the
atmosphere. The Medical IntelliSwitch™ constantly monitors the reserve cylinder and, at a
predetermined pressure, will change the valving to allow gas from the headspace of the reserve
cylinder to feed the system, thus drawing down the pressure in the reserve cylinder. There are three
pressure ratings for liquid cylinder relief valves, 230 PSIG, 350 PSIG and 500 PSIG; the Medical
IntelliSwitch™ has predetermined settings for all three types that may be selected on the front panel
of the system.
Settable Switchover Pressure
The Medical IntelliSwitch™ can be configured to switch at pressures ranging from 100 to 500 PSI.
This value is factory set but can be changed in the field. To change this value, refer to the section on
changing the switchover pressure.
Manual Bank Switching
It is possible to manually change the side that gas is being drawn from by pressing the “BANK
SELECT” button provided that there is sufficient pressure on the side being switched to.
Manual Delivery Regulator Switching
It is possible to manually change which delivery regulator is in use. Simply press the “OUTPUT
SOURCE” button.
Selectable Units of Measure
The default units of measure for the Medical IntelliSwitch™ are PSI. Alternate units of BAR or
MPA can be selected by changing internal DIP switch settings. To change units of measure refer to
the section on changing units of measure.

11
Security Lockout
The Medical IntelliSwitch™ has the ability to electronically lockout the front panel buttons to
discourage tampering. The factory default setting is OFF or disabled. Refer to section on Keypad
Security Lockout for details.
Alarm Notification
The Medical IntelliSwitch™ is designed to interface with CONCOA Remote Alarms and comes
with the necessary mating connector for their use. Refer to the section on connecting a remote alarm
for more information.
Serial Port
The Medical IntelliSwitch™ is capable of communicating to peripheral equipment via a standard
serial port. For more information on the serial port refer to the section on connecting to a serial port.
Ethernet Port
The Medical IntelliSwitch™ is capable of communicating to peripheral equipment via an optional
Ethernet connection. For more information on the Ethernet option refer to the section on connecting
to the Ethernet.
High Flow Relief Valve Overpressure Protection
The Medical IntelliSwitch™ is equipped with a high flow relief valve to protect the system from
extreme pressure increases and liquid withdrawal.

12
OPERATING THE MEDICAL INTELLISWITCH™
Figure 2 identifies and locates the various front panel and external system features.
Selecting a Gas Source
The Source Select buttons on the front panel provide flexibility in the choices of liquid or high
pressure cylinders used in an application. Further, they provide choices of liquid cylinders with
different pressure ratings. There are two Source Select buttons, allowing each side to be controlled
independently. Green indicator lights directly above the Source Select buttons identify which
cylinder choice is currently selected for the side. Each time a Source Select Button is pressed, the
indicator lights above the button will shift to the next choice.
Cylinder Sizes
There are three liquid cylinder pressure ratings that can be selected. For each cylinder pressure, the
Medical IntelliSwitch™ has a preset value it uses to determine when the cylinder has reached an
overpressure condition in order to activate the economizer feature. Table 1 provides the cylinder
pressure choices and their respective economizer pressures.
Table 1
Cylinder Relief Valve
Pressure
Economizer Activation
Pressure
Normal Value to Switch
Back
230 PSI
210 PSI
190 PSI
350 PSI
325 PSI
300 PSI
500 PSI
475 PSI
450 PSI
If a liquid cylinder’s pressure rises to the “activation” pressure, the Medical IntelliSwitch™ will
redirect itself to draw the pressure down through the delivery stream. Once the pressure reaches a
“normal” value, it will return to drawing from the previous side.
Bank Selection
The Bank Select button on the front panel allows for manually switching the active bank. The In-Use
status indicator lights provide the feedback to indicate which side is selected.
Reset
The Reset button is primarily used to reset a “replace” condition when using liquid cylinders. The
Replace status light can only be cleared if the side with the condition has its pressure restored to a
value above the switchover (trip point) plus the Hysteresis value AND the Reset button is pushed. If
the button is pushed while the condition still occurs, the system will attempt to clear the condition
but will reinstate the indicators automatically. Example: Switchover (trip point) = 130 PSI. System
will switch to the other side when pressure drops to 130 PSI. It will not allow switching back until
the pressure reaches 140 PSI (130 PSI + 10 PSI Hysteresis pressure)

13
Testing
GAS WILL CONTINUE TO FLOW WHILE IN THE TEST MODE.
Holding the Reset button in for 5 seconds will place the system in test mode. This diagnostic and
troubleshooting tool performs 23 different tests. Each time the Reset button is pushed again, the
system will perform a different test. Continuing to press the Reset button will step through all the
tests after which the system will return to normal operation. If after the test mode has been
entered there is no pushbutton activity for 5 minutes, the system will return to the normal display
operation. Gas flow is maintained during the test mode. Refer to the Troubleshooting Section for
details on testing.
Keypad Lockout
If the keypad security lockout feature is enabled, the keypad will become inoperative after
approximately 5 minutes provided there has been no buttons pressed. There will be an audible beep
when the keypad goes into the locked state. If the keypad becomes locked it can be re-activated by
holding the Bank Select Pushbutton for approximately 4 seconds. The system will make an audible
beep when it is unlocked. To enable this feature, see Section “User Selectable Features” for
explanation on enabling/disabling this feature.
USER SELECTABLE FEATURES
The Medical IntelliSwitch™ allows various system parameters to be set in the field. They are:
a. Switchover Pressure
b. Delivery Regulator Pressure
c. Delivery Regulator Pressure Tolerance
d. Units of Measure
e. Keypad Security Lockout
f. Remote Alarm Configuration
g. Enabling Reserve Gas Supply
h. Enabling Remote Setup
i. Communication Port

14
Figure 2

15
SETTING SWITCHOVER PRESSURE
The switchover pressure (changeover pressure) point for the Medical IntelliSwitch™ is changeable
up to a value of 500 PSI. Each system has a specific switchover pressure set at the factory based on
the delivery pressure ordered. To change the switchover pressure from the factory set value,
perform the following steps:
Note: In order for the DIP switches to be recognized, DIP switch SW4-3 must be OFF.
1. Turn power OFF to the system.
2. Open door by loosening the four screws holding it to the cabinet.
3. Using Figure 3, locate DIP switch SW1 at the bottom of the electronic circuit board on the
door.
Figure 3
4. Using Table 2 or Table 3 set the desired switchover pressure.
5. Close system door and tighten 4 screws holding door to cabinet.
6. Turn power back ON. The new switchover pressure will take effect on power ON.
Table 2 —DIP Switch Settings
SWITCH
VALUE
SW1-1
1
SW1-2
2
SW1-3
4
SW1-4
8
SW1-5
16
SW1-6
32
SW1-7
64
SW1-8
128
SW1-9
256
Note:
The values shown in the table are
additive. Example: To set
switchover pressure to 130 PSI,
turn on SW1-8 (128) and SW1-2
(2). These added together equal
130 PSI.

16
Note: Tables 2 & 3 show values in PSI. If operating in BAR or MPA it will be necessary to
convert the PSI units to the units being used in order to use the tables. To convert values to
BAR divide the PSI value by 14.5. To convert the values to MPA divide the PSI value by
145.
Table 3 —Typical Switchover Pressure DIP Switch Settings
PSI
SW1-1
SW1-2
SW1-3
SW1-4
SW1-5
SW1-6
SW1-7
SW1-8
SW1-9
75
ON
ON
OFF
ON
OFF
OFF
ON
OFF
OFF
100
OFF
OFF
ON
OFF
OFF
ON
ON
OFF
OFF
125
ON
OFF
ON
ON
ON
ON
ON
OFF
OFF
135
ON
ON
ON
OFF
OFF
OFF
OFF
ON
OFF
150
OFF
ON
ON
OFF
ON
OFF
OFF
ON
OFF
155
ON
ON
OFF
ON
ON
OFF
OFF
ON
OFF
default
175
ON
ON
ON
ON
OFF
ON
OFF
ON
OFF
200
OFF
OFF
OFF
ON
OFF
OFF
ON
ON
OFF
225
ON
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
240
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
default
250
OFF
ON
OFF
ON
ON
ON
ON
ON
OFF
275
ON
ON
OFF
OFF
ON
OFF
OFF
OFF
ON
300
OFF
OFF
ON
ON
OFF
ON
OFF
OFF
ON
325
ON
OFF
ON
OFF
OFF
OFF
ON
OFF
ON
350
OFF
ON
ON
ON
ON
OFF
ON
OFF
ON
375
ON
ON
ON
OFF
ON
ON
ON
OFF
ON
400
OFF
OFF
OFF
OFF
ON
OFF
OFF
ON
ON
425
ON
OFF
OFF
ON
OFF
ON
OFF
ON
ON
450
OFF
ON
OFF
OFF
OFF
OFF
ON
ON
ON
475
ON
ON
OFF
ON
ON
OFF
ON
ON
ON
500
OFF
OFF
ON
OFF
ON
ON
ON
ON
ON

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SETTING DELIVERY REGULATOR PRESSURE
The Delivery Regulator Pressure is factory set based on the model purchased. If it is necessary to
change the pressure of the regulators after installation perform the following steps:
1. Open door by loosening the four screws holding it to the cabinet.
2. Using Figure 4, locate DIP switch SW4 at the bottom of the electronic circuit board on the
door. Move SW4-4 to the ON position. The front panel display will show a screen similar
to Figure 5 indicating the system is in CALIBRATE mode. The front panel display will
show the inlet pressure from the side that it is currently drawing from.
Figure 4
3. Locate the Allen wrench attached to the inside panel.
4. There is a green light to the left or right of the delivery display that indicates which delivery
regulator is in use. If the left light is ON, the pressure being displayed in the delivery
display is the output pressure of the left regulator. Similarly, if the right green light is ON
the pressure being displayed is from the right regulator.
5. Locate the Allen wrench attached to the inside panel. Starting with the delivery regulator
that is currently in use, place the Allen wrench into the set screw and adjust the pressure to
the desired value. Turning the set screw clockwise increases pressure. Counterclockwise
decreases pressure. The system will not decrease in pressure if there is no flow. See Figure
6 for the location of the regulators.
Figure 5

18
6. After the pressure is set to the desired value, press the Output Source Pushbutton on the
front panel to switch to the other delivery regulator.
7. Place the Allen wrench into the set screw of the second regulator and adjust the pressure to
the desired value.
It is possible to switch back to the other delivery regulator and change its pressure by
pushing the Output Source PB again. The delivery pressure for both regulators should be
the same to within 1-2 PSI for best performance.
8. When the desired delivery pressure for both regulators is set, turn OFF SW4-4 on the control
board. See Figure 4.
9. Locate SW5 on the control board (Figure 4) and press it once. The system should go back to
normal operation showing inlet pressures on both inlet displays. If an “Err2” message
appears when SW% is pressed it means that both regulators were not selected for calibration
(See step 6).
10. Calibration is complete. Close door and re-attach screws.
Figure 6