GS COMPRESSOR MANUAL
1.877.631.9058
GS 10-100 HP Manual
Before installation and initial operation of the air compressor, please read the manual carefully and
clearly learn about relevant information for operation and maintenance about the compressor. GS
Compressor is not responsible for damages or injury that may occur due to improper installation or
use. The compressor is designed for indoor use only.
GS COMPRESSOR MANUAL
1.877.631.9058
Contents
1. Introduction to Products and Descriptions………………………...…….…… 3
2. Operating principle ………………………………………………………..……4
3. Technical Data…………………………………………………..…...…………..5
4. Main Structure……………………………………………………….……….…6
5. Electrical Diagram ……………………………………….………………….… 9
6. Warnings…………………………………………………………….….........… 12
7. Equipment Installation………………………………………………....……… 14
8. Operation and Maintenance ……………………………………….……….….15
9. Long Term Storage……………………………………………………………...17
10. Parts Breakdown………………………………………………………………18
GS COMPRESSOR MANUAL
1.877.631.9058
Introduction to Products and Description
Thank you very much for choosing and using GS series screw air compressor. Please read the user's
manual carefully before operating the machine.
GS series screw compressor is an electric screw air compressor that is an air cooled unit. This
compressor is designed for indoor use only and only be installed by a licensed electrician only.
Description on the compressor
The GS screw compressor manufactured in Minneapolis MN is an achievement of many years’
research and development. Since being in the air compressor business since 1964 we understand the
importance of a rugged long lasting screw air compressor.
The machines and units of the series must be operated in accordance to the technical
conditions and must be operated compliance with the range of application and guideline specified in
the operation manual. The operators shall have strong safety awareness and fully recognize the risks
during the operation of the machines. Any functional breakdowns, especially those that will threaten
the safety, must be repaired by a licensed service technician.
Limitation of Liability. IN NO EVENT SHALL EITHER PARTY BE LIABLE TO THE OTHER
FOR ANY INCIDENTAL, CONSEQUENTIAL, SPECIAL, PUNITIVE OR EXEMPLARY
DAMAGES (NOR ANY LOST PROFITS OR LOST OPPORTUNITIES EVEN IF SUCH PARTY
HAS BEEN ADVISED OF THE POSSIBILITY OF THE SAME) ARISING OUT OF OR
RELATING TO THIS AGREEMENT. ACKNOWLEDGES THAT THIS LIMITATION OF
LIABILITY PROVISION HAS BEEN FREELY NEGOTIATED AND THAT THIS LIMITATION
OF LIABILITY PROVISION IS AN ESSENTIAL TERM OF THIS AGREEMENT AND IS
MADE IN RECOGNITION OF THE RELATIVE RISKS AND BENEFITS OF THE SERVICES
CONTEMPLATED IN THIS AGREEMENT. UNDER ALL CIRCUMSTANCES, GS
COMPRESSOR’S MAXIMUM LIABILITY UNDER THIS AGREEMENT SHALL BE LESSER
OF $5,000 OR THE FEES MASTER RECEIVED REASONABLY ATTRIBUTED TO THE
SPECIFIC SERVICE OR EVENT GIVING RISE TO THE LIABILITY.
Warranty is limited if a transformer, buck-boost, phase converter or frequency drive is used.
GS COMPRESSOR MANUAL
1.877.631.9058
Maintenance
The compressor must be carefully maintained to meet various requirements for screw compressors
or compressor units. The machines, therefore, must be carefully maintained during the specified
maintenance period, especially in bad working conditions such as dusty or dirty environments.
Only manufactured parts are to be put in the units. Contact GS Compressor for any products or
service you will need and they can be ordered or you will be advised on a local distributor.
In following the conditions, warranty claims will not be accepted:
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Misuse of the compressor
Improper maintenance
Misuse of materials
Nonuse of the original manufactured parts.
Modifying the equipment
Safety rules
Safety rules in the operation guideline shall be strictly abided by.
Technical modification
We reserve the right to modify all parts without prior notification during the process of technical
research and development.
Note: Compressors are made for individual specifications and customers questions need to
addressed to the manufacturer to ensure the correct technical data is valid. Please call GS
Compressor at 1-877-631-9058 for specific questions.
Operating Principle
A complete operating cycle of the screw air compressor includes the compressor making air by the
inlet opening and shutting along with the compressor going into standby and then turning itself on
when there is a need for air. The compressor will cycle by itself.
a) Procedure of Cycling: As the rotor begins to rotate, one end of the rotor gradually rotates
to form a barrier. This cycle continues until the unit goes into standby,
b) b) Procedure of compression: As the rotor is rotating, barrier between rotors continuously
reduces as rotating rotors mesh. Reduction in volume of the air in the sealed airend between
rotors causes pressure to rise. Thereby the procedure of air compression is carried out.
c) Procedure of standby: As the barrier between rotors continuously reduces, the air with
exhausting pressure is reduced though he inlet. The inlet slowly closes telling the airend to
stop making pressure and gradually goes into standby. Going into standby to fast will create
the air to diminish through every possible outlet causing the inlet to prematurely fail and the
compressor to leak air.
GS COMPRESSOR MANUAL
1.877.631.9058
Technical Data
Model
GS 10
GS 15
GS 20
GS 25
GS 30
GS 50
GS 75
GS 100
Horsepower
10
15
20
25
30
50
75
100
Noise
62 +/ 2
65+/- 2
65+/- 2
65+/- 2
65+/-2
68 +/- 2
68+/- 2
75+/- 2
Cooling Type
Air cooled
Air cooled
Air cooled
Air cooled
Air cooled
Air cooled
Air cooled
Air cooled
Length
33.5”
46.5”
46.5”
50.5”
50.5”
59.5”
75”
75”
Width
26”
28”
28.5”
30”
30”
38.5”
47.5”
47.5”
Height
35”
45.5”
45.5”
47.5”
47.5”
53”
63”
63”
Weight
560 lbs
1000 lb
1050 lb
1200 lb
1360 lb
2000 lb
3000 lb
3200 lb
Please refer to a licensed electrician for amp draw,
wire size and breaker box information.
Belt and Pulley Unit
Cooler
PLC
Electrical Panel
Minimum pressure valve
Cooling fan
Sump
Air filter
Oil filter
Motor
Air inlet valve
Motor Pulley
Airend (Screw)
Belts
Airend Pulley
Shockproof cushion
Direct Drive Unit
Cooler
PLC
Oil filter
Cooling fan
Minimum pressure valve
Sump
Electrical Cabinet
Motor
Coupling
Shockproof cushion
Air filter
Air inlet valve
Airend
( Screw)
Direct Drive Unit
Oil filter housing
Minimum pressure valve
Cooler
Oil filter
PLC
Emergency button
Sump
Air filter
Air inlet
Cooling fan
Electrical
Cabinet
Motor
Shockproof cushion
Airend (Screw)
Tank Mounted Compressor With Dryer
Oil filter housing
Cooler
Emergency Button
Oil filter
Minimum pressure valve
Cooling fan
Electrical Cabinet
Dryer
PLC
Tank
Motor
Shockproof cushion
Air filter
Air inlet
Airend
Airend
Sump
BELT DRIVEN ELECTRICAL DIAGRAM
DIRECT DRIVE ELECTRICAL DIAGRAM
ELECTRICAL DIAGRAM
Warning:
According to the power, voltage and electrical spikes in your facility please consult with your electrician to
determine the correct voltage and breaker box that best suits your needs.
Proper breaker shall be installed by a professional electrician according to the power and voltage of the air
compressor to protect the electrical system, which is shown in the picture below
External Breaker
The air compressor must be properly grounded to avoid the electrical spikes and danger to the end user.
The air compressor needs to be wired with its own external breaker large enough for the full load current amps.
Any transformers, external buck boost or phase converter need to be discussed with a licensed election as not to
damage to the compressor or the end user.
In order to avoid the damage caused by jolt during the process of storage and transportation during delivery the
compressor has bolts fastened to the motor to prevent damage to the unit. Once the compressor is installed the
bolts need to be removed to allow the compressor room for vibration.
S h o c kp r o o f
bolts





Setting up the new machine must be operated by appointed or authorized person by the company.
Operators must read, comprehend and follow the relevant operating procedures, warnings and
maintenance specifications in the manual.
The air compressor shall not be arbitrarily altered or modified from its original version
Air compressor shall be operated indoor, with good ventilation and a temperature that is less than 90° F.
The installation technician shall ensure all wires in the electrical panel are tight and did not get loose in
the event shipping.
Ensure all wires
are tight





It is strictly prohibited that the compressor starts under pressure
Keep the coolant between the range of upper and lower limits of the oil indicator on the sump.
It is strictly prohibited to examine and repair the electrical equipment and breaker unless the power is
off
It is strictly prohibited to repair the internal components while under pressure.
Cleansers which are inflammable, explosive and corrosive cannot be used to maintain and clean the
parts. Use detergent free cleaners instead.
Warning symbols
Name
Symbol
Description
1
Electrical Safety
Make sure electrical supply is off
during maintenance and setup
2
Electricity Danger
Electrical Danger
3
Danger warning
Pay attention to potential fire and
electrical hazards
4
Reading
instruction
5
Flammable
Inflammable
compressor.
flame
6
Explosion hazard
Do not weld of repair the sump
the
Read the
operation
instructions
before
liquids in the
Keep away from
S.N.
Name
Symbol
7
Electric
hazard
8
No air leakage
No air leakage
9
Caution, hand injury
Do not put hand in fan
10
Rotational direction
of the motor
Check rotational direction of the
motor during the process of first
starting up or changing wire to
avoid serious breakdown to the
machine
11
Danger, hot!
Hot surface, avoid touching
shock
Description
Please don't place the equipment
in wet places or outdoors to avoid
electricity shock
Equipment Installations
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
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
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




The floor on which the compressor is mounted should be capable of carrying the weight of compressor and should
be flat and dry. There is no need to fixing (anchorage bolt etc) to the floor.
The compressor room should be easily accessible and sufficiently lite.
For adequate service, the compressor room should have a clearance of at least three (3) feet on all sides
Fire and corrosion causing conditions should be prevented in the operation region.
No pipe load (swaggering connections or tensions arise from environmental variations) should be relayed to
compressor by external connections.
Make sure that the air supply equipment is suitable to the operating pressure of the piping and fittings and is
damage free.
Select the diameter of the air supply, dryer and line filters according to your air supply capacity. (It is beneficiary to
select piping of big diameter considering future development of your company).
Establish a separate line for condense discharge of your filter and dryer and air tanks (water discharge line); this
way the floor of the compressor operating place does not unnecessarily get wet.
Put an air exit and electric box in your compressor room for general purposeYour compressor is manufactured for
indoor operation.
In case of different needs in relation to compressor or air supply contact service or sale representative.
Always place compressor on a rubber mat to reduce vibration
Ensure you soft pipe the air outlet to reduce vibration
COMPRESSOR ROOM VENTILATION
 In order to maintain the operation temperature at a specific value, place your compressor at a place that adequate
air flow is provided. The temperature that compressor operates should be at least 50° F.
 If you think that there will not be sufficient amount of air flow in the room of operation; it is necessary to make room
ventilation or you must discharge the outgoing hot air to the outside. When doing this, the outgoing hot air of
compressor should not return. For this reason, the hot air outlet and room air inlet should not be on the same side.
If necessary, use a fan for discharging the hot air from the room. Place this fan to the closest point of the
compressor hot air outlet
 Avoid the compressor room being subjected to heat or dust emitted by central heating boiler or generator type of
equipment
Operations and Maintenance
Maintenance Schedule:
Frequency
Oil Filter
Separator
Air Filter
Coolant
500 hours
X
X
X
X
2000 hour OR
Ye a r o n e
X
X
X
X
4000 hours OR
Ye a r 2
X
X
X
X
6000 hours OR
Ye a r 3
X
X
X
X
8000 hours OR
Ye a r 4
X
X
X
X
10,000 hours OR
Ye a r 5
X
X
X
X
Return
l i n e g a s ke t
X
Belts
Va r n a s o l v
Inlet
X
X
X
X
X
****Weekly maintenance check consists of blowing out cooler, check belt
tension and check for proper coolant level
Coolant level shall be between the upp er and lower red line of the indicator, shown below
in picture
Oil ind ica ting
tube
Star 5000 coolant should be used exclusively to maximize oil life and in
accordance with compressor warranty.
Star
5000
Coolant
Coolant drainage
valve
Slowl y open the coolant drainage valve and release the coolant.
putting in new coolant.
Shut this prior to
Air filter
Replace the air filter with a new one
Oil-g as
separa to r
Open up the sump. In order complete this, take off the top of the compressor (8
bolts) Then cross unthread the separator(bolts) and gentl y remove the r eturn oil line.
Carefull y remove the separator component and cover and replace separator. Once replaced,
fill coolant through separator and carefull y cross tighten the bolts to the separator then
replace compressor cover.
Oil filter
Unthread old oil filter and replace with new one.
past hand turn with a strap wrench.
Hand tighten oil filter then turn ¼ turn
Long term Storage
Equipment should be sealed if it is shutdown for a long period of time.
 Clean the equipment with non-corrosive cleaner
 Electric equipment such as motor, and electrical panel should be stored dry.
 All coolant should be drained from the system to ensure internal components do not rust.
 Cover the equipment with proper storage material
 Once compressor is ready for startup maintenance should be performed and the airend should be
flooded with coolant and hand turned 3-4 times to ensure the airend does not lock up
Screw Compressor Parts Breakdown
Screw Compressor Parts Breakdown
Part
Name
Quantity
Part
Name
Quantity
1
Panel
1
27
Scavenge Line
1
2
PLC
1
28
Return Line
1
3
Emergency "stop" button
1
29
Air filter Housing
1
4
Motor pulley
1
30
Oil filter
1
5
Motor
1
31
Monoblock
1
6
Electrical Cabinet
1
32
Monoblock housing
1
7
Panel
1
33
Oil Filer Line
1
8
Automatic tension spring of the
airend
1
34
Oil inlet fitting
1
9
Panel
1
35
Oil return fitting
1
1
36
Panel
1
10
Anti-vibration platform
11
Base plate
1
37
Panel
1
12
Anti-vibration pad
4
38
Cooler
1
13
Panel
1
39
Fan Fitting
1
14
Panel
1
40
The protective cover of the
cooler-fan
1
15
Transportation Bolt
1
41
Cooling fan
1
16
Frame
1
42
Control panel
1
17
Discharge pipe
1
43
Belt
3
18
Sump
1
44
Airend ( Screw)
1
19
Sump fitting
1
45
Airend Pulley
1
1
46
Oil Return Line
1
20
Panel
21
Seperator
1
47
Unloading Line
1
22
Panel
1
48
Air intake valve
1
23
Panel
1
49
Pressure Gauge
1
24
Return line
1
50
Sump Plug
1
25
Panel
1
51
Temp Sensor
1
26
Minimum pressure valve
1