Jun-Air 87R-4P Manual

Part No. 6190900 (Rev B)
® Registered Trademark/™ Trademark of JUN-AIR Inc. ©Copyright 2017 JUN-AIR Manufacturing Inc. All Rights Reserved.
WWW.JUN-AIR.COM
ISO 9001 CERTIFIED
87R-4P Compressed
Air System
Operation & Maintenance Manual

2
6190900 (Rev B) 87R-4P Compressor System User Guide
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
Section Page Number
Declaration of Conformity 3
Table of Symbols 4
System Features 5
Installation and Operation 7
Maintenance 11
Troubleshooting 21
Warranty Policy 22
WARNING
PLEASE READ THIS MANUAL COMPLETELY BEFORE INSTALLING AND USING
THIS PRODUCT. SAVE THIS MANUAL FOR FUTURE REFERENCE AND
KEEP IN THE VICINITY OF THE PRODUCT.
Dear Customer:
Congratulations on the purchase of your new JUN-AIR Industrial Compressed Air System.
This system’s intended purpose is for industrial and laboratory compression applications. It is to be used in
accordance with UL1450/CSA 22.2 standards, along with all applicable codes. The system utilizes an oil-less
rocking piston compressor that produces clean, dry, oil-free pressurized air flow when connected to an indus-
trial or laboratory device. The tank ensures that a constant supply of air is available to the device.
A pressure regulator and safety relief valve are also included to ensure safe operation of the system. This
manual provides installation, operation and preventative maintenance guidelines that should be followed to
ensure correct/reliable performance of this system.
Please carry out all maintenance according to relevant instructions.

3
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
87R-4P Compressor System User Guide 6190900 (Rev B)
Declaration of Conformity
Konformitätsbescheinigung
Certificat de Conformité
Declaración de Conformidad
Conformiteitsverklaring
Overensstemmelseserklæring
GB The manufacturer Gast Manufacturing, Inc. declares that the compressor is in conformity with:
• 2014/68/EU Pressure Equipment Directive
• 2014/29/EU Council Directive relating to Simple Pressure Vessels
• 2006/42/EC Machinery Directive
• 2014/30/EU EMC Directive
• 2006/95/EC Low Voltage Directive
• 2011/65/EU RoHS 2 Directive
• 2012/19/EU WEEE Directive
• 1907/2006 and 340/2008 REACH Regulation
DE Der Hersteller Gast Manufacturing, Inc. bescheinigt, dass der Kompressor entspricht:
• 2014/68/EU Druckgeräterichlinie
• 2014/29/EU Richtlinie der einfachen Druckbehälter
• 2006/42/EC Richtlinie zur Sicherheit von Maschinen
• 2014/30/EU Richtlinie der Elektromagnetischen Verträglichkeit
• 2006/95/EC Richtlinie für Niederspannung
• 2011/65/EU RoHS Directive
• 2012/19/EU WEEE Directive
• 1907/2006 und 340/2008 REACH Regulativ
FR Le fabricant Gast Manufacturing, Inc. déclare que le compresseur est conforme aux directives suivantes:
• 2014/68/EU Directive équipements sous pression
• 2014/29/EU Directive relative aux appareils à pression simple
• 2006/42/EC Directive sur la sécurité des machines
• 2014/30/EU Directive sur la compatibilité électro-magnétique
• 2006/95/EC Directive sur les basses-tensions
• 2011/65/EU Directive RoHS
• 2012/19/EU Directive DEEE
• 1907/2006 et 340/2008 Réglementation REACH
ES El fabricante Gast Manufacturing, Inc. declara que el compresor está conforme con:
• 2014/68/EU Directiva de equipos a presión
• 2014/29/EU Directiva en relación a recipientes a presión simple
• 2006/42/EC Directiva de Seguridad de maquinaria
• 2014/30/EU Directiva de Compatibilidad eléctrica magnética
• 2006/95/EC Directiva de baja tensión
• 2011/65/EU Directiva de RoHS
• 2012/19/EU Directiva de WEEE
• 1907/2006 y 340/2008 Reglamento REACH
NL De fabrikant Gast Manufacturing, Inc. verklaart dat de compressor in overeenstemming is met:
• 2014/68/EU Richtlijn Drukapparatuur
• 2014/29/EU Richtlijn voor eenvoudige drukvaten
• 2006/42/EC Machinerichtlijn
• 2014/30/EU Richtlijn inzake Electromagnetische Compatibilitet
• 2006/95/EC Laagspanningsrichtlijn
• 2011/65/EU RoHS Richtlijn
• 2012/19/EU WEEE Richtlijn
• 1907/2006 en 340/2008 REACH Verordening
DK Producenten Gast Manufacturing, Inc. bekræfter hermed at kompressoren er i overensstemmelse med:
• 2014/68/EU Direktivet om trykbærenole udstyr
• 2014/29/EU Direktivet vedrørende simple trykbeholdere
• 2006/42/EC Maskindirektivet
• 2014/30/EU EMC-direktivet
• 2006/95/EC Lavspændingsdirektivet
• 2011/65/EU RoHS Direktivet
• 2012/19/EU WEEE Direktivet
• 1907/2006 og 340/2008 REACH Forordningen

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6190900 (Rev B) 87R-4P Compressor System User Guide
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
TABLE OF SYMBOLS
95 Indicates the acceptable maximum
relative humidity for shipping.
DANGER: Indicates an imminently hazardous
situation which will result in serious or fatal
injury if not avoided. This symbol is used only
in the most extreme conditions.
WARNING: Indicates a potentially hazardous
situation which could result in serious injury
if not avoided.
Electrical Shock Hazard.
Risk of electric shock present. Make sure power
is disconnected before attempting this procedure.
Equipment Alert: Indicates a potentially
hazardous situation that could result in
equipment damage if not avoided.
CAUTION: Indicates a potentially hazardous
situation which may result in minor or
moderate injury if not avoided. It may also be
used to alert against unsafe practices.
WARNING: To Avoid Serious Burns.
Do not touch surface during operation.
ON
OFF
I
O
Indicates the ON and OFF position
for the equipment power switch.
Indicates package should be handled with
these symbols pointing up.
FRAGILE: Handle package with care.
Indicates this package must be kept dry.
-28 °C
-18 °F
+65 °C
+149 °F
Indicates the acceptable shipping
temperature range.
372MM HG
.49 ATM
Indicates the acceptable lowest barometric
pressure conditions in which this unit
can be shipped.
INDUSTRIAL ELECTRICAL EQUIPMENT
With respect to electrical shock, fire, mechanical,
and other specified hazards only in accordance
with UL1450.
Symbol Description
A/C power
Air outlet port
Fuse location
Ground
Hour meter
Over-temp indicator light
Power on indicator light
Pressure gauge
Pressure regulator valve

5
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
87R-4P Compressor System User Guide 6190900 (Rev B)
SYSTEM FEATURES
Cover
Tank
Compressor
IEC plug
& fuse
Power supply
switch
Air
outlet
Output
pressure
regulator
Power
indicator
light
Over-temp
indicator
Hour
meter
Pressure
switch
5 µm
autodrain
filter
System
intake
filter
Drain
solenoid
Dump
solenoid
Compressor
intake
filter
Thermostat
Terminal
block
Heat
exchange

6
6190900 (Rev B) 87R-4P Compressor System User Guide
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
Specifications
NO DRYER
100V 115V 230V
50Hz 60Hz 50Hz 60Hz 50Hz 60Hz
Model Numbers 1770018 1770008 1770009 (NA)
1770010 (EU/UK)
Continuous System
Output Flow @ 4 bar (58 psi)
46 SLPM
[1.6 SCFM]
51 SLPM
[1.8 SCFM]
46 SLPM
[1.6 SCFM]
51 SLPM
[1.8 SCFM]
46 SLPM
[1.6 SCFM]
51 SLPM
[1.8 SCFM]
Continuous System
Output Flow @ 8 bar (116 psi)
27 SLPM
[1.0 SCFM]
31 SLPM
[1.1 SCFM]
27 SLPM
[1.0 SCFM]
31 SLPM
[1.1 SCFM]
27 SLPM
[1.0 SCFM]
31 SLPM
[1.1 SCFM]
Cut-in Pressure16 bar [87 psi]
Cut-out Pressure18 bar [116 psi]
Maximum Operational Pressure 8 bar [116 psi]
Dew Point Suppression2N /A
Air Filtration 5 µm
Safety Relief Valve Pressure 9.3 bar (135 psi)
High Temperature Indication ≥60 °C [140 °F] in compressor chamber
Air Connections 1/4 in BSPP
Current, A 5.0 5.8 4.8 5.3 2.6 2.9
Power Consumption, W 450 550 500 600 550 650
Fuse Specifications 12.5 A, 250 Vac, time delay
Sound Level, dB(A) 46 48 46 48 46 48
Operating Ambient Conditions 10 °C to 40 °C [50 °F to 104 °F]
10 - 95% RH*
Storage Ambient Conditions
-28 °C to 65 °C [-18 °F to 149 °F]
10 - 95% RH*
Barometric pressure >372 mm-Hg [14.7 in-Hg]
System Dimensions
W x H x D
406 mm x 495 mm x 439 mm
[16 in W x 19.5 in D x 17.3 in H]
System Weight 29.5 kg [65 lb]
Shipping Weight 35.0 kg [77 lb]
Regulatory Certifications UL 1450 / CSA 22.2 / CE
1The compressor switches on and off at the cut-in and cut-out pressures, respectively. The cut-in and cut-out pressures are adjustable.
2Membrane dryer specifications are available upon request.
* Avoid conditions that promote condensation on the equipment.

7
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
87R-4P Compressor System User Guide 6190900 (Rev B)
INSTALLATION AND OPERATION
Intended Use
To provide compressed air for use with industrial or labora-
tory devices as a primary or back-up air source.
JUN-AIR compressor systems meet or exceed the most
current and highest safety standards, which are:
• UL1450, 4th edition
• CSA C22.2 68
• ISO 9001:2008
• Ingress protection: IP50
• 2006 / 42 / EC Directive
• RoHS compliant
To ensure the safety potential of this equipment is
achieved, please:
Make sure your equipment is installed according to the
instructions provided in this manual and make sure the
installation checklist is completed prior to starting the
equipment.
DANGER
The equipment is not suitable for use in the presence
of a flammable anesthetic mixture or with oxygen or
nitrous oxide. DO NOT OPERATE THE EQUIPMENT IF
THESE CONDITIONS EXIST.
Transportation and Storage Conditions
• Temperature: -28 °C (-18 °F) to 65 °C (149 °F)
• Relative humidity: 10% to 95%
• Minimum barometric pressure: 372 mm•Hg
(14.7 in•Hg)
• Keep the system dry at all times.
• Do not stack units during shipment, installation, or us-
age.
Equipment Alert: Refer servicing to an authorized
service representative.
Unpacking
1. Cut the banding strap from the carton and remove the
lid and cardboard inserts.
2. Visually inspect the entire system for shipping damage
and verify that the following accessories have been
included: two (2) locking casters, two (2) non-locking
casters, four (4) vibration-isolation feet, four (4) studs,
four (4) washers, and one (1) power cable.
a. If the contents were damaged during shipping,
contact the freight carrier to file a claim.
b. If parts are missing, contact the supplier.
3. Use caution when removing the system from the
remaining packaging. Retain the packaging material for
future use, if necessary.
4. Install the casters or rubber mounting feet.
Before You Install...
Equipment Alert: Compressors are oil-less and
require NO lubrication.
Equipment Alert: The system must be installed in a
temperature-controlled and/or ventilated room to
ensure operational ambient temperature of 50 °F to
104 °F [10 °C to 40 °C]. A 12-inch clearance is required
on each side and top of unit to allow air flow.
Failure to do so could cause premature loss of
system performance and void warranty.
Personal Safety
DANGER
Risk of fire or explosion when using flammable substances.
Do not operate the system in an area containing combustible
gases or anesthetic mixtures.
CAUTION
Never leave children unattended near the system when in use.
WARNING
Property damage and/or personal injury may result
if directions are not followed or if the manufacturer’s
replacement parts/accessories are not used.
WARNING
Only connect equipment suitable for the listed maximum
pressure of the system.

8
6190900 (Rev B) 87R-4P Compressor System User Guide
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
WARNING
DO NOT install the system on a surface with an incline that
exceeds 10°.
WARNING
If unit is operating at a high altitude, adjustments to the
duty cycle (on time) or operating pressure may be required.
Consult a service technician prior to making any adjustments.
WARNING
A leaking pressure relief valve may indicate a need for
adjustment or repair. Consult a service technician prior to
making any adjustments.
Protection Against Electrical Shock
Provide proper grounding per NFPA 70 (NEC 2008). Do
not create a current path from the equipment to ground
through your body.
Electrical Safety
• Verify that the voltage and frequency specified on the
system are the same as that of the supply power.
• Never operate unit outside the specified voltage range
(see “SITE REQUIREMENTS” for range).
• See “SPECIFICATIONS” for more electrical information.
• Indicator light on the system cover displays when sys-
tem power is supplied and power switch is on.
Electromagnetic Interference (EMI):
The JUN-AIR system is designed to avoid electromagnetic
emissions interference with surrounding electrical
equipment. Due to the vast assortment of electrical
equipment available, it is possible that some interference
may be experienced by the end customer. If interference
is experienced, the device that is creating interference
should be removed from the room where the compressor
system is located. If the interference persists, then it
may be necessary to confirm that both devices are
connected to isolated (separated) circuits per “ELECTRICAL
CONNECTIONS” in this manual. If the problem still occurs,
then the two devices should be moved as far apart as
possible. Finally, if the problem cannot be eliminated,
contact JUN-AIR.
CAUTION
Routinely inspect any and all power cords for cuts and
abrasions. Discontinue use and have an authorized service
representative replace cord if damaged.
WARNING
Use of an extension cord is not advisable. An undersized
extension cord will cause a drop in line voltage and loss of
power. Overheating may result. Death or fire from electrical
shock could occur.
WARNING
Electric shock could occur as a result of improper
grounding. This product must be grounded
according to NEC regulations and all local codes
WARNING
Always switch system off and remove power when servicing
or removing the electrical cover. Lock out power at the breaker
prior to servicing.
CAUTION
Do not plug into an ungrounded outlet or adapter. Reliable
earth ground can only be achieved when system is connected
to a grounded receptacle.
WARNING: To Avoid Serious Burns,
do not touch surface during operation and allow it
to cool prior to servicing.

WARNING
Electrical Shock Hazard
The grounding wire is indicated by green insulation or
green insulation with yellow stripes.
Install this product in a dry location.
Install this product where it will be weather protected.
This product must be properly grounded. Electrically
ground this product per local codes.
Check the condition of the power supply wiring.
Do not permanently connect this product to wiring that is
not in good condition or is inadequate for the requirements
of this product.
Follow all local applied codes prior to installation.
Failure to follow these instructions can result
in death, fire, or electrical shock.

9
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
87R-4P Compressor System User Guide 6190900 (Rev B)
Site Requirements
Specifications 100 V
50-60 Hz
115 V
50-60 Hz
230 V
50-60 Hz
Electrical
Voltage
min./max. 90/110 103/127 207/253
Full load amps
(50 Hz) 5.0 4.8 2.6
Full load amps
(60 Hz) 5.8 5.3 2.9
Placement
• The system is intended only for indoor use in a climate-
controlled and dust-free environment.
• Do NOT install/operate the system in an enclosed area
where the ambient temperature could fall below 10 °C
(50 °F) or rise above 40 °C (104 °F).
• Maintain a minimum clearance of 30 cm (12 in) on the
top and sides of the system for service access and
cooling.
• Ensure that the system is placed on a surface with an
incline that does not exceed 10°.
Indicates the ON and OFF position for the
equipment power switch (system breaker)
When ON, the indicator light will illuminate
and current WILL be
supplied to system.
When OFF, the indicator light will
NOT illuminate and current WILL NOT be
supplied to the system.
I
o
= ON
= OFF
I
o
Pneumatic Connections
WARNING
The system should only be installed by qualified personnel
in a clean, dry, well-ventilated area on a firm surface with an
incline of less than 10°.
Equipment Alert: Verify that all leaks are sealed.
Air leaks are the primary cause of premature
system failures.
Connect the plumbing from the device air-inlet to the 1/4 in
BSPP air-output fitting on the back panel of the system.

10
6190900 (Rev B) 87R-4P Compressor System User Guide
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
Electrical Connections
Equipment Alert: If a replacement fuse is required,
then a 12.5 A, 250 VAC resistance time-delay fuse
should be used.
Refer to the specifications table for the electrical
specifications of your model.
1. Remove the screw retaining the cord anchor from
the back panel of the system. Place the cord anchor
around the cord and secure it to the back panel using
the screw provided, ensuring enough slack in the cord
to connect it to the system.
2. Plug the male IEC connector on the power cord into
the female connector on the back panel of the system,
ensuring it is seated securely.
3. Plug the opposite end of the cord into an outlet provid-
ing the voltage and frequency required by the system,
per specifications. Cord retainer
Air output
1/4 BPST
Fuse holder
IEC C13 power
inlet module
System Voltage Frequency Charge Time Recover
Time
Cut-In
Pressure
Cut-Out
Pressure
1770008 115 V
50 Hz/60 Hz ≤55 s @ 50 Hz
≤45 s @ 60 Hz
≤30 s @ 50 Hz
≤25 s @ 60 Hz 6 bar (87 psi) 8 Bar (116 psi)
1770009 230 V
1770010 230 V
1770018 100 V

11
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
87R-4P Compressor System User Guide 6190900 (Rev B)
System Checks and Tests
WARNING
Always switch the system off and disconnect power when
removing the system cover.
1. Switch the system power on and verify that the com-
pressor runs and the storage tank begins to pressurize.
2. Check the incoming line voltage to verify that it remains
within the range specified in the Site Requirements
table while the system is running. If the voltage does
not remain within the specified range, contact JUN-AIR.
NOTES:
• The safety relief valve is set to 9.3 bar (135 psi).
• The pressure switch is set to cut in at 6 bar (87 psi) and
cut out at 8 bar (116 psi). See the specifications table
for details.
• Monitor the line-pressure gauge when testing for leaks.
• The tank pressure can be measured using the line
pressure gauge by closing the system outlet and ad-
justing the regulator knob clockwise until it no longer
turns.
• If the tank pressure drops more than 0.5 bar (7.5 psi) in
three minutes, air leaks are present. Locate and repair
the leak(s).
• Soapy water can be used to check for pressure leaks.
Operation
1. When the system is completely installed and ready for
operation, it can be switched on using the power switch
on the back panel. A light on the front panel will turn on
to indicate that power is supplied to the system and it
is operational.
2. The system will provide clean, dry air and has preset
cut-in and cut-out pressures of approximately 6 bar
(87 psi) and 8 bar (116 psi), respectively. Check the in-
ternal tank gauge reading to verify the pressure-switch
settings. Contact your authorized dealer before adjust-
ing the cut-in/cut-out pressures to values outside the
preset range.
3. The pressure of the output air can be adjusted using
the regulator knob.
4. When the system is not in use, it should be turned off
using the power switch on the back panel. The indicator
light on the system cover will turn off when the system
is powered down.
WARNING
Discharge pressure in the tank prior to transporting the
system or removing connections.
MAINTENANCE
Performing regularly scheduled maintenance will ensure
your system provides you with years of superior service.
To extend your system’s life, please do the following:
• Keep the system and surrounding area clean and free
of debris.
• Maintain the recommended ambient temperature; high
temperatures will shorten the life of the system.
• Verify that all leaks are sealed.
Equipment Alert: Indicates a potentially
hazardous situation that could result in
equipment damage if not avoided.

WARNING
Electrical Shock Hazard
Disconnect electrical power supply cord before performing
maintenance on this product
If product is hard wired into system, disconnect electrical
power at the circuit breaker or fuse box before performing
maintenance on this product.
Failure to follow these instructions can result in death,
fire, or electrical shock.
WARNING
Injury Hazard
Product surfaces become very hot during operation,
allow product surfaces to cool before handling.
Air stream from product may contain solid or liquid
material that can result in eye or skin damage, wear
proper eye protection.
Clean this product in a well ventilated area.
Failure to follow these instructions can result in death,
fire, or electrical shock.
WARNING: Always disconnect power before
servicing. Surface(s) can be extr
emely hot depending
on system usage. Do not touch hot parts during or
immediately after operation.

12
6190900 (Rev B) 87R-4P Compressor System User Guide
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
Cleaning or Replacing the System-Intake
Filter Element
1. Turn the system off and disconnect it from electrical
power.
2. Remove the intake filter element from the system cover
and inspect for damage.
3. If cleaning the filter, use warm, soapy water and ensure
that it is dry before reinstalling. If replacing the filter,
discard the used element.
4. Install the new or cleaned filter element into the system
cover, ensuring that it is fully seated the cover.
5. Reconnect electrical power to the system.
NOTE: Filter kits are available for the system (see PARTS
AND ACCESSORIES).
Replacing the Autodrain-Filter Element
1. Turn the system off and disconnect it from electrical
power.
2. Bleed all of the air from the system.
3. Remove the handle bolts (4) and loosen the cover
screws (4) to tilt the cover forward.
4. Rotate the filter bowl and drop it down slightly to re-
move it, using caution to avoid damaging or kinking the
drain tube.
5. Remove the filter element by turning it completely out,
using caution to avoid damaging the plastic element
holder. Discard the used filter.
6. Install a new 5 µm filter element after verifying that it is
the correct part.
7. Position the filter bowl by pushing up slightly and rotat-
ing it into place. Verify that the drain tube is not kinked
or damaged.
8. Ensure that the drain tube passes through the base
plate and into the evaporator tray.
9. Replace the cover and reinstall the handle bolts and
cover screws.
10. Reconnect the electrical power to the system.
Replacing the Evaporator-Tray Element
1. Turn the system off and disconnect it from electrical
power.
2. Remove the handle bolts (4) and loosen the cover
screws (4) to tip the cover forward.
3. Locate the evaporator tray and remove the foam.
4. Discard the used foam, clean the tray, and install new
foam.
5. Replace the cover and reinstall the handle bolts and
cover screws.
6. Reconnect the system to electrical power.
Replacing the Compressor-Intake Filter
Element
1. Turn the system off and disconnect it from electrical
power.
2. Remove the handle bolts (4) and loosen the cover
screws (4) to tip the cover forward.
3. Remove the intake filter cap by depressing and rotating
it while holding the base of the filter.
4. Remove and discard the used intake filter element.
5. Install a replacement filter element and reinstall the
filter cap.
6. Replace the cover and reinstall the handle bolts and
cover screws.
7. Reconnect the system to electrical power.
WARNING
Disposal of system components, deemed non-usable by
the authorized dealer and the end user, should be done in
accordance with all local codes. Contact your local waste
management authorities to determine proper disposal
methods.
WARNING
Do not exceed the OSHA requirements of 2 bar [29 psig] air
for cleaning purposes.

13
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
87R-4P Compressor System User Guide 6190900 (Rev B)
Pressure-Switch Adjustment
WARNING
Exceeding the maximum pressure may result in a reduced
system life. Contact Gast Manufacturing for information
regarding operation at higher pressure.
Equipment Alert: The factory set cut-in and cut-out
pressures are approximately 6 bar (87 psi) and
8 bar (116 psi), respectively.
Equipment Alert: The system should operate
at 50% duty cycle or less.
1. Turn the system off and disconnect it from electrical
power.
2. Remove the handle bolts (4) and loosen the cover
screws (4) to tip the cover forward.
3. Remove the screw retaining the pressure-switch cover
and remove the cover.
4. To increase the cut-in pressure, use a 7 mm wrench or
socket to turn each of the two nuts on the large springs
(A) clockwise; both springs should be adjusted equally.
Each half-turn raises the cut-out pressure approxi-
mately 0.25 bar (3.5 psi). The cut-in pressure can be
reduced by turning the springs in the opposite direc-
tion.
5. Set the cut-out pressure by adjusting the pressure dif-
ferential (the difference between the cut-in and cut-out
pressures). To increase the pressure differential turn
the nut on the small spring (B) clockwise. Decrease the
pressure differential by turning the nut counter-clock-
wise. Ensure that the cut-out pressure does not exceed
the maximum rated pressure of the system.
6. Replace and secure the pressure-switch cover to pro-
tect against electric shock.
7. Reconnect the system power and charge the tank and
verify that the compressor switches off at the desired
cut-out pressure. Should the pressure reach 9.3 bar
(135 psi) ±3%, the safety relief valve will open and purge
the tank.
8. Drain air from the system through the regulator to
verify that the compressor switches on at the desired
cut-in pressure.
9. Disconnect power and repeat steps 3-8, if necessary.
10. Replace the cover and reinstall the handle bolts and
cover screws.
11. Reconnect the system to electrical power.
Pressure Switch ’’ on or ’O’ off
Adjustment of Pressure Switch Section

14
6190900 (Rev B) 87R-4P Compressor System User Guide
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
Testing the System for Leaks
It is recommended that leak testing be performed after any
maintenance or service.
1. Close the valve to the facility plumbing.
2. Run the system until it reaches the maximum operating
pressure—approximately 8 bar (116 psi).
3. Turn the system off.
4. Let the system rest for five minutes.
5. If the pressure drops more than 0.5 bar (7.5 psi) within
five minutes, then leaks must be repaired.
6. Use soapy water to locate leaks and repair them as
necessary.
7. Open the valve to the facility plumbing.

15
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
87R-4P Compressor System User Guide 6190900 (Rev B)
Parts and Accessories
Part no. Description Kit contents
4736609 European power cord
4736621 UK / GBR power cord
4736620 Asian / Australian power cord
4736915 IEC C13/C14 power cord
4736882 US 115 V power cord
4736931 US 230 V power cord
AS560 Check valve
AS620A Filter kit (annual) Intake filters and evaporator filter
K964 Compressor rebuild kit O-rings, seals, cups, cylinders
AS623 Rubber-mounting-feet kit Four (4) rubber isolation feet and washers
Preventive Maintenance Schedule
Interval Action P/N
Monthly Remove and clean system-intake filter -
Annually Replace system-intake filter AS562
Annually Replace autodrain-filter element 4071009
Annually Replace compressor-intake filter element B300A
Annually Replace evaporator-tray foam element AS561A
Annually Test for air leaks -
Annually Inspect system for functionality using system checks and tests -
8,000 hours Rebuild compressor K964

16
6190900 (Rev B) 87R-4P Compressor System User Guide
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
Model: 1770008

17
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
87R-4P Compressor System User Guide 6190900 (Rev B)
Models: 1770009 &
1770010

18
6190900 (Rev B) 87R-4P Compressor System User Guide
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
Model: 1770018

19
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
87R-4P Compressor System User Guide 6190900 (Rev B)
Pneumatic Schematic
(applies to all models)
Compressor
with Motor
Intake Filter
Aftercooler
5
µm
Filter
Pressure Gauge
0-8 Bar (0 to 120 psi)
4 Liter Tank
SAFETY RELIEF VALVE
9.3 BAR (135 psi)
Pressure Switch CUT-IN 6.0 BAR (87 psi) CUT-OUT 8.0 BAR (116 psi)
System
Outlet,
1/4 BSPT
Drain Line
Adjustable
Pressure
Regulator
Dump
Solenoid
Valve
Compressor
Chamber
X= Pneumatic Tube Connection Letter
Check
Valve
AS613"X" = 6mm OD Tubing
AS614"X" = 8mm OD Tubing
AT697
Hose
Evaporator Tray
Manifold
Block
8-B
Tank Purge
Timer Solenoid
System
Enclosure
Quick
Couplings
6-A
8-A
8-C
8-D
8-G
8-E8-F
6-B
6-C
6-D
B
h
h
B

20
6190900 (Rev B) 87R-4P Compressor System User Guide
© 2017, JUN-AIR
We reserve the right to make any alterations which may be due to any technical improvements
Printed in the USA
Electrical Schematic
(applies to all models)
Black
Blue
Motor
Compressor
Compressor Chamber
X=AS580"X" Electrical Wire Reference
Connector
IEC Inlet
Meter
Hour
White
Indicator Light
"Power On"
Green
Switch
I/O
Block
Terminal
Fan
Cooling
(each lead)
12.5A SB Fuse, X2 Thermostat
SPDT
Switch
Pressure
DPST
Indicator Light
"Over Temp"
Yellow
w/Timer
Capacitor
A
K2K1
H
J
ED
C B
BF
K3
K4 K5
K6
S
T
Z
X
W
G
Brown
Brown
Brown
Blue
Blue
Brown
Blue
White
Solenoid
Yellow
Brown
Yellow
Brown
Blue
Green &
Yellow
Blue
Brown
Blue Brown
Blue
Brown
Blue
Brown
Enclosure Cover
Connector
L2L1 L4L3 L6L5
Brown
Blue
Blue
Brown
Blue
Brown
Green &
Dump Valve
w/ Timer
M
WAGO
Green
Green
WAGO
WAGO
K
Black
Black
L
Brown
Blue
Solenoid Valve
Wire harness
AS581 Male
Wire harness
White
White
Blue
AS582 Female
Motor
Compressor Chamber
Capacitor
Z
X
W
Compressor
Yellow
Brown
Yellow
Red
Orange
Black
Red
Tank Drain
Green &
Orange
115V
230V
Ins.
B
B
30:00 30:00
1
2
3