BeaconMedaes 4107 9006 25 Manual

Installation, Operation and Maintenance Instructions
Scroll Laboratory Air Compressor System (-10°C Dew Point)
Part number 4107 9006 25
Revision 11
September 15, 2020

Part number 4107 9006 25
Revision 11
September 15, 2020
Installation, Operation and Maintenance Manual
2-15 Hp “Oil-Less” Scroll Laboratory Air Systems
This unit is purchased from:
Date purchased:
Model number:
Serial number:
Option(s) included:
Any information, service or spare parts requests should include the machine serial number and be
directed to:
BeaconMedæs
1059 Paragon Way
Rock Hill, SC 29730
Telephone: [phone]
Fax: [phone]
BeaconMedæs reserves the right to make changes and improvements to update products sold
previously without notice or obligation.

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“Oil-Less” Scroll Laboratory Air
4107 9006 25.11
Table of Contents
1.0 General Information
1.1 Component Description
1.2 Electromagnetic Immunity
2.0 Installation
2.1 Inspection Upon Receiving
2.2 Handling
2.3 Location
2.4 Space Requirements
2.5 Piping
2.6 Wiring
3.0 System Operation
3.1 Prestart-up
3.2 Initial Start-up
3.3 Normal Start-up
3.4 Normal Operation
3.5 Normal Shutdown
3.6 Emergency Shutdown / Alarms
4.0 Trouble Shooting
5.0 Maintenance
5.1 Maintenance Schedule
5.2 Service Kits
6.0 Inspection/Replacement Procedures
6.1 V-Belts
6.2 Air Intake Filter
6.3 Motor Lubrication
6.4 Liquid Level Sight Glass
6.5 Zero Loss Electronic Drain
6.6 Backup Pressure Switch Set Point Adjustments
6.7 General Inspections
7.0 Replacement Parts
8.0 Specifications
8.1 Duplex Base Mount Scroll SPC Laboratory Air System
8.2 Triplex Base Mount Scroll SPC Laboratory Air System
8.3 Quadruplex Base Mount Scroll SPC Laboratory Air System
8.4 Pentaplex / Hexaplex Base Mount Scroll SPC Laboratory Air System

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“Oil-Less” Scroll Laboratory Air
4107 9006 25.11
9.0 Maintenance Record
Appendix A: Desiccant Dryer
A.1 General Information
A.2 Operation
A.3 Trouble Shooting
A.4 Maintenance
A.5 Replace/Repair
A.6 Dryer Specifications
Appendix B: Dew Point Transmitter
B.1 General Information
B.2 Introduction
B.3 Specifications
B.4 Operation
B.5 Alarms
B.6 Maintenance
B.7 Troubleshooting
B.8 Dew Point Sensor Calibration
B.9 Dew Point Sensor Replacement
Appendix C: TotalAlert Embedded Control System
C.1 Board Configurations
C.2 PCB1 (5.7” Display Controller)
C.3 PCB2 (3.5” Display Controller)
C.4 Password Access
C.5 Testing Alarms
C.6 Maintenance
C.7 Remote Monitoring
C.8 BACnet Activation

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“Oil-Less” Scroll Laboratory Air
4107 9006 25.11
Safety Precautions
Pressurized air from the system may cause
personnel injury or property damage if the unit is
improperly operated or maintained.
Operator should have carefully read and become
familiar with the contents of this manual before
installing, wiring, starting, operating, adjusting
and maintaining the system.
Operator is expected to use common sense safety
precautions, good workmanship practices and
follow any related local safety precautions.
In addition:
• Before starting any installation or
maintenance procedures, disconnect all
power to the package.
• All electrical procedures must be in compliance
with all national, state, and local codes and
requirements.
• A certified electrician should connect all
wiring.
• Refer to the electrical wiring diagram provided
with the unit before starting any installation or
maintenance work.
• Release all pressure from the package before
removing, loosening, or servicing any covers,
guards, fittings, connections, or other devices.
• Notify appropriate hospital personnel if
repairs or maintenance will aect available
compressed air levels.
• This is a high speed, rotating piece of
machinery. Do not attempt to service any part
while machine is in operation.
• To prevent automatic starting, disconnect
all electrical power before performing any
maintenance.
• Do not operate unit without belt guards,
shields or screens in place.
• Make sure that all loose articles, packing
material, and tools are clear of the package.
• Check all safety devices periodically for proper
operation.
• Never operate a compressor with its isolation
(shuto ) valve closed or without its relief
valve in place. Damage to the compressor may
occur.
• Do not add lubricating oil of any kind to
the compressor. Absolutely no oil is required
for proper operation.
• The “Manual” mode of operation should only
be used for emergencies such as a master
printed circuit board malfunction and should
not be used for normal operation.
• Electrical service must be the same as specified
on the control panel nameplate or damage to
the equipment may occur.
• Vibration during shipment can loosen electrical
terminals, fuse inserts, and mechanical
connections. Tighten as necessary.

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1.1 Component Description
NOTE: The features listed in this section are
standard for laboratory air systems. In the case of
special system configurations, these features may
or may not be included with the system.
System Design
The Scroll Laboratory Air SPC (Single Point
Connection) system consists of a single point
connection, base mounted design including the
following:
• Oil-less scroll compressors and motors
• Duplexed desiccant drying system with purge
control
• Duplexed line filters and regulators
• Dew Point transmitter
• Integral, pre-wired, U.L. labeled control panel
• Corrosion resistant air receiver
The complete package is pre-wired, pre-piped, and
assembled on one common base with single point
connections for electrical, intake air, discharge air,
and condensation drain. Each system includes
valving to allow complete air receiver bypass, as
well as air sampling port.
Compressor Module
The compressor is a continuous duty rated scroll
type compressor. The design is single stage, air-
cooled, consisting of one fixed and one orbiting
scroll sealed with PTFE tip seals between the
scroll halves and rated for 120 psig discharge
pressure. The scrolls are protected from dust or
contamination with a two part face seal. Orbiting
bearings for scrolls are grease filled which require
grease lubrication. See Section 5 for recommended
compressor maintenance. The drive bearing is
grease filled and lip sealed for its maintenance
interval. The scroll case is constructed of diecast
aluminum. Maximum heat dissipation is achieved
through an integral cooling fan and air ducting.
Compressor Drive and Motor
The compressor is v-belt driven and protected by
an OSHA approved totally enclosed beltguard. A
sliding motor mounting base that is fully adjustable
with two adjusting screws is incorporated to
achieve belt tensioning. The motor is a NEMA
rated, open dripproof, with 1.15 service factor
suitable for 208 or 230/460V electrical service.
Intake
Each compressor has one inlet air filter. The inlet
filter removes dust from the incoming air through
cyclonic action and through an element.
Discharge Piping
Each compressor is equipped with an integral
air-cooled aftercooler designed for a maximum
approach temperature of 15° F complete with
automatic solenoid drain valve. Each compressor
is equipped with a wired high discharge air
temperature shutdown RTD. The compressor
discharge line includes a flex connector, safety
relief valve, isolation valve and check valve. The
discharge piping of each compressor incorporates
an integral valve to provide load-less starting and
rapid air evacuation between the check valve and
scroll discharge at shutdown to minimize reverse
rotation of the scroll. The discharge air piping is
made of brass and/or stainless steel. The discharge
flex connector is braided, 304 stainless steel, brass,
or bronze.
Isolation System
The compressor and motor shall be fully isolated
from the system base by means of a four-point,
heavy duty, isolation system for a minimum of 95%
isolation eciency. Seismic isolation is optional.
Dryer
Each desiccant dryer is individually sized for peak
calculated demand and capable of producing
a 10°F (-12°C) pressure dew point. Dryer purge
flow is minimized through a demand-based purge
saving control system that includes a 441™ transfer
valve utilizing two ceramic slide plates. The inlet
to each dryer includes a mounted prefilter with
automatic drain and element change indicator.
1.0 General Information

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Control System
The mounted and wired control system is U.L.
labeled. This control system provides automatic
lead/lag sequencing with circuit breaker
disconnects for each motor with external operators.
The control panel also includes full voltage motor
starters with overload protection, redundant 24V
DC control circuit power supplies, visual and
audible reserve unit alarm with isolated contacts
for remote alarm, and touch screen display.
Automatic alternation of compressors based on
a first-on/first-o principle with provisions for
simultaneous operation if required, visual and
audible alarm indication for high discharge air
temperature shutdown with isolated contacts for
remote alarm are included.
Final Line Filters and Regulators
Fully duplexed final line filters rated for 1 micron
with element change indicators, along with
duplexed final line regulators, are factory mounted
and piped.
Dew Point Hygrometer
The factory mounted, piped and wired, dew point
hygrometer includes remote alarm contact. The
dew point sensor is a ceramic type with system
accuracy of ± 2° F. The dew point alarm is factory
set at 36° F (2° C) per NFPA 99. High dew point
condition is indicated with visual and audible
alarm. Transmitters disconnected from control
system will activate an alarm. See Appendix A for
detailed information.
Air Receiver
The vertical air receiver is corrosion resistant,
ASME Coded, National Board Certified, and rated
for a minimum 150 PSIG design pressure. The tank
piping includes a liquid level gauge glass, safety
relief valve, manual drain valve, and a zero loss
automatic solenoid drain valve.
1.0 General Information

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1.0 General Information
1.2 Electromagnetic Immunity
1.2.1 EN 61000-6-2
Medical Electrical Equipment needs special
precautions regarding EMC and needs to be
installed and put into service according to the
EMC information provided in this manual.
Portable and mobile RF communications
equipment can aect Medical Electrical
Equipment.
The use of accessories, transducers, and cables
other than those specified by the manufacturer,
may result in decreased immunity of the TotalAlert
Embedded control system.
The TotalAlert Embedded control system should
not be used adjacent to other equipment. If
adjacent use is necessary, the TotalAlert Embedded
control system should be observed to verify
normal operation in the configuration in which it
will be used.

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1.0 General Information
1.2.1 EN 61000-6-2 (Cont.)
Guidance and manufacturer’s declaration - electromagnetic immunity
The TotalAlert Embedded control system is intended for use in the electromagnetic environment specified
below. The customer or the user of the TotalAlert Embedded control system should assure that it is used in such
an environment.
Immunity test IEC 60601
test level Compliance level Electromagnetic environment - guidance
Electrostatic
Discharge (ESD)
IEC 61000-4-2
±6 kV contact
±8 kV air
±6 kV contact
±8 kV air
Floors should be wood, concrete or ceramic tile.
If floors are covered with synthetic material, the
relative humidity should be at least 30 %.
Electrical fast
transient/burst
IEC 61000-4-4
±2 kV for power
supply lines
±1 kV for input/
output lines
±2 kV for power supply
lines
±1 kV for input/output
lines
Mains power quality should be that of a typical
commercial or hospital environment.
Surge
IEC 61000-4-5
±1 kV dierential
mode
±2 kV common mode
±1 kV dierential mode
±2 kV common mode
Mains power quality should be that of a typical
commercial or hospital environment
Voltage dips, short
Interruptions and
voltage variations on
power supply input
lines
IEC 61000-4-11
<5 % UT
(>95 % dip in UT)
for 0,5 cycle
<40 % UT
(>60 % dip in UT)
for 5 cycles
<70 % UT
(>30 % dip in UT)
for 25 cycles
<5 % UT
(>95 % dip in UT)
for 5 sec
<5 % UT
(>95 % dip in UT)
for 0,5 cycle
<40 % UT
(>60 % dip in UT)
for 5 cycles
<70 % UT
(>30 % dip in UT)
for 25 cycles
<5 % UT
(>95 % dip in UT)
for 5 sec
Mains power quality should be that of a typical
commercial or hospital environment. If the
user of the TotalAlert 2 requires continued
operation during power mains interruptions, it is
recommended that the TotalAlert 2 be powered
from an uninterruptible power supply or battery.
Power frequency
(50/60 Hz) magnetic
field
IEC 61000-4-8
3 A/m 3 A/m Power frequency magnetic fields should be at
levels characteristic of a typical location in a typical
commercial or hospital environment.
NOTE: UTis the a.c. mains voltage prior to application of the test level.

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1.0 General Information
1.2.1 EN 61000-6-2 (Cont.)
Guidance and manufacturer’s declaration - electromagnetic immunity
The TotalAlert Embedded control system is intended for use in the electromagnetic environment specified
below. The customer or the user of the TotalAlert Embedded control system should assure that it is used in such
an environment.
Immunity test IEC 60601
test level Compliance level Electromagnetic environment - guidance
Conducted RF
IEC 61000-4-6
Radiated RF
IEC 61000-4-3
3 Vrms
150 kHz to 80 MHz
3 V/m
80 MHz to 2,5 GHz
3 Vrms
3 V/m
Portable and mobile RF communications
equipment should be used no closer to any part of
the TotalAlert Embedded control system, including
cables, than the recommended separation distance
calculated from the equation applicable to the
frequency of the transmitter.
Recommended separation distance
d= 1,2√P
d= 1,2√P80 MHz to 800 MHz
d= 2,3√P800 MHz to 2,5 GHz
where Pis the maximum output power rating
of the transmitter in watts (W) according to
the transmitter manufacturer and dis the
recommended separation distance in metres (m).
Field strengths from fixed RF transmitters, as
determined by an electromagnetic site survey,a
should be less than the compliance level in each
frequency range.b
Interference may occur in the vicinity of equipment
marked with the following symbol:
NOTE 1 At 80 MHz and 800 MHz, the higher frequency range applies.
NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is aected by absorption and
reflection from structures, objects and people.
a Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile
radios, amateur radio, AM and FM radio broadcast and TV broadcast cannot be predicticted theoretically with
accuracy. To assess the electromagnetic environment due to fixed RF transmitters, an electromagnetic site survey
should be considered. If the measured field strength in the location in which the TotalAlert Embedded control system
is used exceeds the applicable RF compliance level above, the TotalAlert Embedded control system should be
observed to verify normal operation. If abnormal performance is observed, additional measures may be necessary,
such as reorienting or relocating the TotalAlert Embedded control system.
bOver the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.

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4107 9006 25.11
2.1 Inspection Upon Receiving
The condition of the Scroll Laboratory Air system
should be carefully inspected upon delivery. Any
indication of damage by the carrier should be noted
on the delivery receipt, especially if the system will
not be immediately uncrated and installed. Scroll
systems may remain in their shipping containers
until ready for installation. If Scroll systems are
to be stored prior to installation, they must be
protected from the elements to prevent rust and
deterioration.
DO NOT REMOVE the protective covers from the
inlet and discharge connection ports of the unit
until they are ready for connecting to the hospital’s
pipeline distribution system.
2.2 Handling
WARNING:
USE APPROPRIATE LOAD RATED LIFTING
EQUIPMENT AND OBSERVE SAFE LIFTING
PROCEDURES DURING ALL MOVES.
The compressor package can be moved with
either a forklift or dollies. Be sure that the orange
spacers used to prevent the compressor and motor
assemblies from floating are in place, as well as
the dryer spacer on 2 - 7.5 hp systems. These
spacers will prevent unnecessary movement while
moving and mounting the unit. Keep all packing
in place during installation to minimize damage.
Walk along the route the unit must travel and note
dimensions of doorways and low ceilings. Scroll
2 - 7.5 hp systems are designed to go through 36”
doorways. Scroll 10 hp systems must be separated
to go through 36” doorways.
If the system must be separated, carefully label all
electrical connections that are removed for easier
re-assembling at the final destination. Place units
to ensure high visibility of indicators and gauges
and for performing maintenance on the system.
2.3 Location
The Scroll Laboratory Air system should be
installed indoors in a clean, well-ventilated
environment. Areas of excessive dust, dirt or other
air-borne particulate should be avoided.
Secure the package to a flat, level surface capable
of supporting the weight and forces of the unit.
Make sure that the main base is not bowed,
twisted, or uneven. Because of the internal flexible
hose connections and spring isolators, no special
foundation is required. However, the unit base
must be securely bolted using all mounting holes
provided in the base. If a raised concrete pad is
used, the base must not overhang the concrete
pad. A method to drain away moisture is necessary.
If a gravity drain is not available, a connection to
a drain is necessary. After securing the unit to the
floor, remove the orange spacers from under the
compressor/motor structure.
The area should have an average ambient
temperature of 70°F (21°C) with a minimum
ambient temperature of 40°F (4.4°C) and
a maximum ambient temperature of 105°F
(37.8°C). (Note: At temperatures below 32°F the
bare compressor will not be adversely aected,
but freezing of the condensate can occur which
could aect operation.)
Sound levels of 65 to 80 dbA are to be anticipated
depending on the size of the package (duplex,
triplex, quad). Though the sound levels are
not excessive, they should be considered when
locating the system.
2.0 Installation

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2.4 Space Requirements
Scroll Laboratory Air systems should be placed
to ensure easy access to perform maintenance
and high visibility of indicators and gauges. It is
recommended that a minimum space of 24” be
allowed on all sides of the compressor system for
ventilation and maintenance. A minimum space
of 36” in front of the control panel is required by
NEC code. A vertical distance of 36” is required
above the unit for ventilation and maintenance.
2.5 Piping
2.5.1 Discharge Piping
Table 2.1 Minimum Discharge Pipe Size1
LifeLine Units Pipe Size
Duplex 2 Hp ¾
Duplex 3 Hp ¾
Duplex 5 Hp ¾
Duplex 7.5 Hp ¾
Duplex 10 Hp 1
Duplex 15 Hp 1
Triplex 5 Hp 1
Triplex 7.5 Hp 1
Triplex 10 Hp 1
Triplex 15 Hp 1¼
Quad 5 Hp 1
Quad 7.5 Hp 1¼
Quad 10 Hp 1¼
Quad 15 Hp 1½
Pentaplex 10 Hp 1½
Pentaplex 15 Hp 1½
Hexaplex 10 Hp 1½
Hexaplex 15 Hp 1½
1A larger discharge pipe size may be
required depending on the length of
distribution piping in the facility. However,
the distribution pipe size should not be less
than the minimum pipe size shown above.
For discharge pipe sizing, refer to standard pressure
drop tables. Total pressure drop in piping should
not exceed 5 psi.
2.6 Wiring
WARNING:
BE SURE TO DISCONNECT ALL ELECTRICAL
POWER FROM THE COMPRESSOR
BEFORE PERFORMING ANY ELECTRICAL
PROCEDURES.
Refer to the electrical diagram provided with
the unit before starting any installation or
maintenance work.
Do not operate compressor on a voltage other
than the voltage specified on the compressor
nameplate.
All customer wiring should be in compliance
with the National Electrical Code and any other
applicable state or local codes.
CAUTION: In the Duplex configuration, all
voltages will be disconnected from the compressor
modules using the circuit breaker. Opening the
appropriate fused knife-switch disconnects control
power. Turning o the appropriate motor circuit
breaker disconnects motor power.
Refer to the wiring diagram(s) that came with
the compressor system for pertinent wiring
connections.
Check the control voltage, phase, and amp ratings
before starting the electrical installation, and
make sure the voltage supplied by the facility is
the same. The wire size should be able to handle
peak motor amp load of all operating units, refer
to the full load and compressor system amperes
on the wiring diagram.
Check all electrical connections within the air
system that may have loosened during shipment.
2.0 Installation

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“Oil-Less” Scroll Laboratory Air
4107 9006 25.11
2.0 Installation
Qualified electricians only should make power
connections to the control panel and any
interconnecting wiring. The control panel
has openings for electrical and alarm/data
connections. Do not drill additional holes in
the control panel as this may void the system
warranty. See Figure 2.1 for opening locations.
Ensure that the emergency generation system
electrical supply is consistent with the air system’s
requirements.
Three-phase power supplied from emergency
generator(s) must match that of the normal supply
to allow for correct direction of the motor rotation
at all times.
Electrical
Connection
Data
Connection
Alarm
Wires
Figure 2.1 Electrical/Alarm/Data Openings

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“Oil-Less” Scroll Laboratory Air
4107 9006 25.11
3.1 Prestart-up
The contractor should notify BeaconMedæs
two weeks prior to start-up date to schedule an
appointment for an authorized technician to
review the installation prior to start-up.
CAUTION: Failure to install the unit properly and
have an authorized technician from BeaconMedæs
start-up the system can void the manufacturer’s
warranties.
Prestart-up and start-up procedures should be
performed for a new installation or when major
maintenance has been performed.
WARNING:
Have more than one person on hand during
prestart-up and start-up procedures to
ensure safety and to facilitate certain
checks.
The main power source to the control panel should
be OFF for the duration of the visual inspection.
Ensure that the equipment is installed on a solid
level surface.Walk aroundthesystemtoensurethat
there is enough clearance on all sides to perform
operational checks/actions and maintenance. The
temperature of the area containing the modules
should be approximately 70°F (21.1°C) with a
minimum ambient temperature of 40°F (4.4°C)
and a maximum ambient temperature of 105°F
(40°C).
Check all piping system joints that might have
come loose during shipment and installation to
ensure they are tight.
Check the air receiver, dryers, controls, and
compressors for damage.
Check the drain valves on the air receiver and
compressor modules.
Check all valves for full open and full close travel.
Ensure that the system’s valves are positioned
for proper operation. (Refer to labeling on valve
handles) Remove all packing material from
the unit including the orange shipping blocks
under the compressor module(s) and dryer
tower (2-7.5 Hp Dpx).
Check the electrical connections to the control
cabinet.
Verify electrical service. Before starting the system,
check to see that voltage, amperage, and wire size
are appropriate.
CAUTION: Electrical service must be as specified
or damage to equipment may occur.
WARNING:
To prevent electrical shock, ensure that
ALL electrical power to the system is OFF,
including the disconnect switches and
Automatic-Manual-O touch screens on
the control panel. The facility’s supply
circuit breaker should also be locked out.
Open the electrical cabinet by loosening the
fasteners on the front.
CAUTION: Vibration during shipment and
installation can loosen electrical terminals, fuse
inserts, and mechanical connections. Tighten as
necessary.
Check the electrical cabinet for any broken
components.
Check that all motor starter connections are tight
and that there are no loose objects such as terminal
lugs, screws, nuts, etc., in the cabinet.
3.0 System Operation

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4107 9006 25.11
3.2 Initial Start-up
CAUTION: Complete the prestart-up procedure
before continuing with the initial start-up
procedure.
WARNING:
To prevent electrical shock, ensure that
ALL electrical power to the system is OFF,
including the disconnect switches and
Automatic-Manual-O touch screens on
the control panel. The facility’s supply
circuit breaker should also be locked out.
NOTE: DO NOT ADD OIL TO THE COMPRESSOR.
The design of the Scroll compressor is totally oil-
less. It is not necessary to fill the crankcases with
oil.
Inside the control panel, make sure that all unit
printed circuit boards are set to the manual
override “O” position. This is indicated by the
middle position “X” on the three-position sliding
switch as shown in Figure 3.2.
3.0 System Operation
Figure 3.1 Touchscreen Controls
Main Screen
Proximity Sensor
Unit Screen # 2Unit Screen # 1
Alarm Buzzer
Power ON Light
Manual Override
Switch
O - On Manual
X - O
A - Automatic
Figure 3.2 Unit PCB Override Switch

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4107 9006 25.11
3.0 System Operation
Check all voltages supplied to the Scroll system
to ensure they are the required value and phases
needed by the control panel.
Opentheoutletisolationvalveoneachcompressor.
Open the receiver isolation valves.
Close the receiver bypass valve.
Close the DP sensor isolation valve.
Close the inlet and outlet valves on both dryer/
filter/regulator assemblies.
Close the outlet isolation valve.
Apply power to the system and turn the disconnect
switches to “On”.
Inside the control cabinet, switch one of the unit
printed circuit boards from the manual override
“O” position to the bottom position, the default
“Automatic” mode. Make sure the Pump Mode on
the Unit touchscreens are in the O position, see
Figure 3.3.
Figure 3.3 Unit Screen - O Position
Check for correct direction of rotation of each
compressor by pressing the “Rotation” button
on touchscreen display (found in the Service
section of the Unit touchscreens - See Section
D.3.7 for additional information) and observing
rotation. See Figure 3.4. The Pump Mode for each
compressor must be in the O Position for the
Rotation to function.
WARNING:
DO NOT RUN THE COMPRESSOR
BACKWARDS!
Figure 3.4 Unit Screen - Service: Rotation
Rotation direction arrows are located on the
belt guard (rotation is counter clockwise, facing
the compressor pulley). Correct the rotation, if
required, by switching the motor leads at the
starter.
REMOVE POWER BEFORE WORKING ON ANY
ELECTRICAL CONNECTIONS.
Repeat the process of switching the Unit printed
circuit boards from the manual override “O”
position to the default “Automatic” position and
testing rotation.
Start each compressor by pressing “Automatic”
on the touchscreen. See Figure 3.5. Allow each
compressor module to operate for a short time (15
to 30 seconds) and check for any unusual noises

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“Oil-Less” Scroll Laboratory Air
4107 9006 25.11
3.0 System Operation
Open the inlet isolation valve on one of the dryers.
The pressure reading on one of the gauges should
be the same as the panel. The other gauge will
normally read 0 psig, and airflow will be coming
from the dryer purge exhaust muer. It is possible,
but unlikely, that the outlet dew point may be low
enough to activate the purge saving feature at
start-up. If the purge saving feature is activated,
then both dryer pressure gauges will be at the
same pressure as the control panel and there will
be no flow from the dryer purge exhaust muer.
Check for air leaks.
Adjust the pressure regulator to the desired
pressure setting.
Open the outlet isolation valve of the dryer/filter/
regulator group. Check for air leaks.
Open the Dew Point sensor isolation valve.
Slowly open the outlet isolation valve to allow air
to flow out to the facility.
Adjust the pressure regulator setting if necessary.
If everything appears normal, open the inlet
isolation valve of the other dryer/filter/regulator
assembly. If the dryer pressures appear as expected,
open the dryer/filter/regulator outlet isolation
valve. Close the other dryer/filter/regulator inlet
and outlet isolation valves.
CAUTION: Only one dryer/filter/regulator group
should be on line at a time.
Adjust the pressure regulator to the desired
pressure.
Adjust the pressure regulator setting, if necessary.
The dryer should purge until the dew point
monitor reading is below minus 10°C. If dew
point is below minus 10°C; both pressure gauges
of the on-line dryer will read the same.
Observe the system for normal operation.
or vibrations. Switch the compressor back to the
“O” position on the touchscreen.
Figure 3.5 Unit Screen - Automatic Mode
After testing each compressor, if everything
appears normal, put each compressor into the
“Automatic” mode and allow each compressor to
run until pressure builds in the air receiver. The lag
compressor should stop first when the pressure
reaches its set point on the controller. Pushing the
reset button on the control panel can now reset
the lag alarm. See Figure 3.6. The lead compressor
should stop when the pressure reaches 140 psig.
Check for any leaks in the piping up to the inlet
isolation valves of the dryers. Repair leaks, if
needed.
Reset Button
Figure 3.6 Main Screen - Reset Button

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“Oil-Less” Scroll Laboratory Air
4107 9006 25.11
3.0 System Operation
3.3 Normal Start-up
Facility shuto valve - CLOSED.
Receiver bypass valve - CLOSED.
One air dryer o line with valves CLOSED; the
other air dryer on-line with the valves OPEN.
Main electrical power - ON.
Disconnect switches - ON.
Pump mode to “Automatic” on touchscreen
display.
Pressure increasing to 140 psi.
Check that each compressor shuts down as it
reaches its o-limit pressure.
Check that the mainline regulator is set for the
desired output pressure and adjust if necessary.
Slowly OPEN the facility shuto valve.
NOTE: Opening the facility valve may cause a
pressure demand that brings the lag compressors
back on-line. This is a normal sequence.
NOTE: The Laboratory Air system is now on-line
and in the Normal Operating Mode (lead/lag
operation).
To verify dryer operation, refer to Appendix A for
desiccant dryers.
3.4 Normal Operation
3.4.1 Controls
During normal operation, all pumps should be
in “Automatic” mode to eectively control the
system. The controls monitor the system pressure
condition (see the table 3-1), starts and stops the
compressors depending on changing pressure
conditions, and automatically alternates the lead
position between compressor units.
In a typical duplex system, the control will signal
the lead compressor to start at 130 psig with
falling system pressure. If the one compressor can
carry the load, then the system pressure will rise to
140 psig. At this point, the control will turn o the
lead compressor. When the system pressure drops
again to 130 psig, the control will automatically
sequence the lead role to the other compressor
and will start it. This is known as “first on/first o”
instead of the more traditional “last on/first o”.
With the “first on/first o” sequencing technique,
starts and stops on the compressor are minimized.
If the lead compressor runs continuously in
lead for more than 17 minutes, the control
will automatically sequence the compressor
attempting to evenly distribute the run time
among all available compressors. In a triplex or
quadruplex system, the operation is very similar
to the duplex operation described above.
NOTE: For a compressor to be considered
available to the system, its pump must be in the
“Automatic” position.
Table 3.1 System Pressure Factory Settings
System Pressure Settings
Start
(Close)
Stop
(Open)
Lead Varies 140 psig
Lag 120 psig Varies
Backup Switch 110 psig 135 psig
NOTE: Factory settings may vary depending on
system size and configuration.
For maintenance or other reasons, compressors can
operate in “Manual” position. The compressor(s)
in the “Manual” mode will start and stop
depending on backup pressure switch conditions.
NOTE: Any compressor in the “Manual” mode
will start and stop depending on backup pressure
switch condition.

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3.0 System Operation
3.4.2 Dryers
This fully automatic, heat-less type dryer
alternately cycles the compressed process gas
flow through two desiccant charged vessels where
the gas’ vaporous moisture content is adsorbed.
One desiccant vessel is always on-line in a drying
cycle throughout normal dryer operation. The
opposite, o-line vessel is in a regeneration cycle
for removal of the previously adsorbed moisture
content, or in a purge saving cycle at line pressure.
When the dryer is in the “Manual” mode, the
dryer will shift towers every 30 seconds. At normal
operating conditions, one tower is approximately
100 psig and the other tower is at 0 psig. Any
condition other than this is not normal and will
cause a high dew point condition. During tower
changeover, the online chamber will exhaust,
and the chamber that is regenerating (purging)
will come to line pressure. There is a 5 second
repressurization cycle. If the dryer is in the
“Manual” mode, the dryer will use 15% of the
system capacity to purge the dryer.
When the dryer is in the “Automatic” mode, the
dew point monitor controls the dryer purge, and
purging depends on the dew point condition.
See Figure 3.7. When the dew point reading is
above the setpoint of -10°C (14˚F), the dryer will
function normally (one tower at system presure,
one tower at 0 psig). When the dew point is below
the setpoint of -10°C (14˚F), the purge valve
will close. In this condition, both towers will be
approximately 100 psig (dependent upon tank
pressure) and the dryer will not shift towers until
the dew point is above -10°C (14˚F).
Dryer 2 is in Automatic mode, Dryer 1 is in O position
Figure 3.7 Main Screen - Dryer Operation
3.5 Normal Shutdown
Dryer in Automatic Mode
Disconnect switches-OFF
Main power source-OFF
Facility shuto valve-CLOSED
Air receiver manual tank drain-OPEN
Pressure gauge decreasing to 0 psi (0 kPa)
Close air receiver manual tank drain when pressure
decreases to 0 psi (0 kPa)

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4107 9006 25.11
3.0 System Operation
3.6 Emergency Shutdown / Alarms
The following conditions may arise during
operation.
Figure 3.8 Unit Screens - Shutdown and Alarms
Motor Overload Shutdown - This will shut down
the compressor in question and will not re-start
until the reset button on the starter inside the main
control cabinet is reset and the appropriate reset
button is pressed on the control panel display.
See “Motor overheating” in the Troubleshooting
Section 4.0.
High Air Temperature Shutdown - This will shut
down the compressor in question and will not re-
start until the appropriate button is pressed on the
control panel. Before allowing the unit to re-start,
the condition should be checked (see “Compressor
shuts o unexpectedly” in the Troubleshooting
Section 4.0). Even after resetting the alarm and
putting the compressor in “Automatic” mode,
the unit may not re-start, depending on system
sequencing and system pressure.
High Air Temperature Alarm - This will not shut
down the compressor in question but instead is
a warning that a shutdown is likely to occur. The
condition should be checked immediately (see
“High temperature alarm” in the Troubleshooting
Section 4.0) to avoid a compressor shutdown.
Control Circuit Alarm - This will not shut down
the compressor in question but instead is a
notification that there is a loss of communication
between printed circuit boards within the control
panel. See Appendix D on Control System for
troubleshooting.
Figure 3.9 Main Screen - Alarms
Dew Point Alarm - This alarm will activate if the
dew point exceeds the alarm setting. To silence the
alarm,pressthe horn silencebutton. Ifthesituation
does not correct itself through normal dryer use,
see Appendix B, section B.7 Troubleshooting for
possible causes and solutions. The alarm remains
latched until the alarm condition is reset by the
operator.
Ambient Temperature Alarm - This alarm will
activate when the temperature in the room
exceeds the set point. The audible alarm will not
sound but a touchscreen will show an active alarm
and record it in the event log. The alarm remains
latched until the alarm condition is reset by the
operator.