Graco 247936, 247937 User Manual
Instructions
Manual Electrostatic
PRO™ Xs Waterborne
Air Spray Gun
For use with conductive spray materials (waterborne and other materials
less than 1 megohm-cm). For professional use ONLY.
For use in Class I, Div. I hazardous locations using Group D spray materials.
#53
For use in Group II, Zone 1 areas using Group IIA spray materials.
II 2 G EEx 0.24 mJ
312900G
EN
247936 Standard Model
247937 Smart Model
100 psi (0.7 MPa, 7 bar) Maximum Air Inlet Pressure
100 psi (0.7 MPa, 7 bar) Maximum Working Fluid Pressure
Important Safety Instructions:
Read all warnings and instructions in this manual.
Save these instructions.
See page 2 for Table of Contents.
Smart Model
247937
Standard Model
247936
Table of Contents
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
How the Electrostatic Air Spray Gun Works . . . . 5
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Install the System . . . . . . . . . . . . . . . . . . . . . . . . 9
Warning Sign . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Ventilate the Spray Booth . . . . . . . . . . . . . . . . . . 9
Connect the Air Line . . . . . . . . . . . . . . . . . . . . . 11
Connect the Charging Probe . . . . . . . . . . . . . . 11
Connect the Exhaust Tube . . . . . . . . . . . . . . . . 12
Connect the Fluid Line . . . . . . . . . . . . . . . . . . . 12
Filter the Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Select a Fluid Nozzle and Air Cap . . . . . . . . . . 13
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Check Electrical Grounding . . . . . . . . . . . . . . . . 15
Check Fluid Resistivity . . . . . . . . . . . . . . . . . . . 15
Check Fluid Viscosity . . . . . . . . . . . . . . . . . . . . 16
Prepare to Paint . . . . . . . . . . . . . . . . . . . . . . . . 16
Flush . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Pressure Relief . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Electrical Troubleshooting . . . . . . . . . . . . . . . . . . 22
Electrical Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Test Total Gun Resistance . . . . . . . . . . . . . . . . 23
Test Gun Resistance . . . . . . . . . . . . . . . . . . . . . 23
Test Charging Probe Resistance . . . . . . . . . . . . 23
Test Power Supply Resistance . . . . . . . . . . . . . 24
Test Barrel Resistance . . . . . . . . . . . . . . . . . . . 24
Spray Pattern Troubleshooting . . . . . . . . . . . . . . . 25
Gun Operation Troubleshooting . . . . . . . . . . . . . . 26
Gun Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Prepare the Gun for Repair . . . . . . . . . . . . . . . . 27
Replace Air Cap/Nozzle . . . . . . . . . . . . . . . . . . 28
Replace Fluid Needle . . . . . . . . . . . . . . . . . . . . 28
Remove Fluid Packing . . . . . . . . . . . . . . . . . . . . 29
Repair Packing Rod . . . . . . . . . . . . . . . . . . . . . . 30
Remove Barrel . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Install Barrel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Remove and Replace Power Supply . . . . . . . . . 32
Remove and Replace Turbine Alternator . . . . . . 33
Repair Fan Air Adjustment Valve . . . . . . . . . . . . 33
Repair Fluid Adjustment Valve . . . . . . . . . . . . . 34
Repair Air Valve . . . . . . . . . . . . . . . . . . . . . . . . . 34
Remove and Replace Atomizing Air
Restrictor Valve . . . . . . . . . . . . . . . . . . . . . . 35
Repair ES ON/OFF Valve . . . . . . . . . . . . . . . . . 35
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Air Line Accessories . . . . . . . . . . . . . . . . . . . . . 41
Fluid Line Accessories . . . . . . . . . . . . . . . . . . . 41
Gun Accessories . . . . . . . . . . . . . . . . . . . . . . . . 42
Miscellaneous Accessories . . . . . . . . . . . . . . . . 42
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Graco Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Graco Information . . . . . . . . . . . . . . . . . . . . . . . . . 44
2 312900G
Warnings
Warnings
The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The exclamation point symbol alerts you to a general warning and the hazard symbols refer to procedure-specific risks. When
these symbols appear in the body of this manual, refer back to these Warnings. Product-specific hazard symbols and
warnings not covered in this section may appear throughout the body of this manual where applicable.
WARNING
WARNINGWARNINGWARNING
FIRE, EXPLOSION, AND ELECTRIC SHOCK HAZARD
Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. To help prevent fire
and explosion:
• Electrostatic equipment must be used only by trained, qualified personnel who understand the require-
ments of this manual.
• Ground equipment, personnel, object being sprayed, and conductive objects in work area. See
Grounding instructions.
• Only use grounded Graco conductive air supply hoses.
• Check gun and hose resistance and electrical grounding daily.
• Use and clean equipment only in well ventilated area.
• Interlock the gun air supply to prevent operation unless ventilating fans are on.
• Use cleaning solvents with highest possible flash point when flushing or cleaning equipment. To com-
ply with EN50050 requirements, cleaning solvents must have a flash point at least 5°C above ambient
temperature.
• Always turn the electrostatics off when flushing, cleaning or servicing equipment.
• If there is static sparking or you feel a shock, stop operation immediately. Do not use equipment until
you identify and correct the problem.
• Eliminate all ignition sources; such as pilot lights, cigarettes, portable electric lamps, and plastic drop
cloths (potential static arc).
• Do not plug or unplug power cords or turn lights on or off when flammable fumes are present.
• Keep work area free of debris, including solvent, rags and gasoline.
• Keep a working fire extinguisher in the work area.
ELECTRIC SHOCK HAZARD
This equipment must be grounded. Improper grounding, setup, or usage of the system can cause electric
shock.
• Turn off air supply before servicing equipment.
• All electrical wiring must be done by a qualified electrician and comply with all local codes and
regulations.
• Do not touch gun electrode when electrostatics are on.
• Do not expose to rain. Store indoors.
PRESSURIZED EQUIPMENT HAZARD
Fluid from the gun/dispense valve, leaks, or ruptured components can splash in the eyes or on skin and
cause serious injury.
• Follow Pressure Relief Procedure in this manual, when you stop spraying and before cleaning,
checking, or servicing equipment.
• Tighten all fluid connections before operating the equipment.
• Check hoses, tubes, and couplings daily. Replace worn or damaged parts immediately.
312900G 3
Warnings
WARNING
WARNINGWARNINGWARNING
EQUIPMENT MISUSE HAZARD
Misuse can cause death or serious injury.
• Do not operate the unit when fatigued or under the influence of drugs or alcohol.
• Do not exceed the maximum working pressure or temperature rating of the lowest rated system com-
ponent. See Technical Data in all equipment manuals.
• Do not leave the work area while equipment is energized or under pressure. Turn off all equipment and
follow the Pressure Relief Procedure in this manual when equipment is not in use.
• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine manufac-
turer’s replacement parts only.
• Do not alter or modify equipment.
• Use equipment only for its intended purpose. Call your distributor for information.
• Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot surfaces.
• Do not kink or over bend hoses or use hoses to pull equipment.
• Keep children and animals away from work area.
• Comply with all applicable safety regulations.
TOXIC FLUID OR FUMES HAZARD
Toxic fluids or fumes can cause serious injury or death if splashed in the eyes or on skin, inhaled, or swallowed.
• Read MSDS’s to know the specific hazards of the fluids you are using.
• Store hazardous fluid in approved containers, and dispose of it according to applicable guidelines.
• Always wear impervious gloves when spraying or cleaning equipment.
• If this equipment is used with isocyanate material, see additional information on isocyanates in Isocya-
nate Conditions Section of this manual.
4 312900G
Overview
KEY
How the Electrostatic Air Spray Gun Works
Overview
The air hose supplies air to the spray gun. Part of the air
operates the turbine and the rest of the air atomizes the
fluid being sprayed. The turbine generates power, which
is converted by the power cartridge to supply high voltage current to the gun’s external charging probe.
A Air swivel inlet page 6
B Fluid inlet page 6
C Turbine air exhaust page 6
D Air cap and nozzle page 6
E Fluid needle page 6
F Fluid adjustment page 7
G Fan air adjustment valve page 7
H Atomizing air restrictor valve page 7
I ES ON/OFF switch page 7
J ES indicator (247936 only) page 8
K Voltage/current display (247937 only) page 8
L ES HI/LO switch (247937 only) page 8
M LO voltage adjustment (247937 only) page 8
N External charging probe
The pump supplies fluid to the hose and gun, where the
fluid is atomized by the air cap and the atomized particles are electrostatically charged as they pass the
external charging probe. The charged fluid is attracted
to the grounded workpiece, wrapping around and
evenly coating all surfaces. The external charging
allows the fluid supply to remain grounded at all times
and therefore eliminate the need for an isolation system.
J
MAX FLUID WPR:
100 PSI (7bar, 0.7 Mpa)
MAX AIR WPR:
I
100 PSI (7bar, 0.7 Mpa)
To avoid shock or explosion
•Use properly grounded air hose
•Read instruction manual
I O
ES
F
G
N
Smart Model
247937
Standard Model
247936
ti12581
K
M
L
H
I
0
HI
LO
ES
I O
100
KV
Ma
MAX FLUID
WPR: 100 PSI
(7bar, 0.7 Mpa)
MAX AIR
WPR: 100 PSI
(7bar, 0.7 Mpa)
ES
%
F
G
E
D
A
ti12658
Smart Model
247937
ti12582
BC
312900G 5
Overview
A. Air swivel inlet. Left-hand thread.
B. Fluid inlet.
ti1254a
A
C. Turbine air exhaust.
D. Air cap and nozzle. See page 13 for sizes.
E. Fluid needle. Shuts off fluid flow and provides a
ground point.
B
C
E
ti1254a
ti1254a
ti1255a
D
ti1256a
6 312900G
F. Fluid adjustment valve. Adjusts fluid needle travel.
Use only in low flow conditions, to reduce needle
wear.
G. Fan air adjustment valve. Adjusts fan size and
shape.
0
LO
ES
I O
0
LO
ES
I O
KV
Ma
MAX FLUID
WPR: 100 PSI
HI
(7bar, 0.7 Mpa)
MAX AIR
WPR: 100 PSI
(7bar, 0.7 Mpa)
ES
KV
Ma
HI
ES
100
%
100
%
MAX FLUID
WPR: 100 PSI
(7bar, 0.7 Mpa)
MAX AIR
WPR: 100 PSI
(7bar, 0.7 Mpa)
Overview
F
G
H. Atomizing air restrictor valve. Restricts atomizing
air flow. Replace with plug (included) if desired.
I. ES ON/OFF switch. Turns electrostatics ON (I) or
OFF (0).
ES
I O
H
100
%
0
KV
I
HI
LO
ES
I O
Ma
MAX FLUID
WPR: 100 PSI
(7bar, 0.7 Mpa)
MAX AIR
WPR: 100 PSI
(7bar, 0.7 Mpa)
ES
ti1257a
312900G 7
Overview
J. ES indicator (247936 only). Green when ES is ON
(I).
MAX FLUID WPR:
100 PSI (7bar, 0.7 Mpa)
MAX AIR WPR:
100 PSI (7bar, 0.7 Mpa)
To avoid shock or explosion
•Use properly grounded air hose
•Read instruction manual
I O
ES
J
ti12581
K. Voltage (247937 only). Shows voltage and
current.
Green/yellow=spray,
red=see Electrical Troubleshooting, page 22.
NOTE: Normal current draw for this model is higher
and the yellow current bar will be lit.
L. ES HI/LO switch (247937 only). Sets voltage to HI
or LO (factory settings).
Voltage
Current
L
LO
I O
0
HI
LO
ES
I O
0
KV
Ma
HI
ES
ES
KV
Ma
MAX FLUID
WPR: 100 PSI
(7bar, 0.7 Mpa)
MAX AIR
WPR: 100 PSI
(7bar, 0.7 Mpa)
ES
100
MAX FLUID
WPR: 100 PSI
(7bar, 0.7 Mpa)
MAX AIR
WPR: 100 PSI
(7bar, 0.7 Mpa)
100
%
K
%
ti12582
ti12582
M. LO voltage adjustment (247937 only). Remove
plug to adjust to 4 settings.
8 312900G
0
LO
ES
I O
KV
Ma
HI
ES
100
%
MAX FLUID
WPR: 100 PSI
(7bar, 0.7 Mpa)
MAX AIR
WPR: 100 PSI
(7bar, 0.7 Mpa)
M
ti12582
Installation
Installation
Install the System
Installing and servicing this equipment requires
access to parts which may cause electric shock or
other serious injury if work is not performed properly.
• Do not install or service this equipment unless you
are trained and qualified.
• Be sure your installation complies with National,
State and Local codes for the installation of electrical apparatus in a Class I, Div. I, Group D or a
Group II, Category 2G Hazardous Location.
• Comply with all applicable local, state, and
national fire, electrical, and other safety regulations.
FIG. 1. shows a typical electrostatic air spray system. It
is not an actual system design. For assistance in
designing a system to suit your particular needs, contact
your Graco distributor.
Warning Sign
Mount warning signs in the spray area where they can
easily be seen and read by all operators. An English
Warning Sign is provided with the gun.
Ventilate the Spray Booth
Provide fresh air ventilation to avoid the buildup of
flammable or toxic vapors when spraying, flushing,
or cleaning the gun. Do not operate the gun unless
ventilation fans are operating.
Electrically interlock the gun air supply with the ventilators to prevent gun operation without ventilating fans
operating. Check and follow all National, State, and
Local codes regarding air exhaust velocity requirements.
High velocity air exhaust will decrease the operating efficiency of the electrostatic system. Air exhaust velocity of
100 ft/min (31 linear meters/minute) should be sufficient.
312900G 9
Installation
a
c‡d
‡e
g
h
f
Fig. 1. Typical Installation
m
c‡
j‡
l
v
ES ON/OFF valve:
I is ON, O is OFF
ti12721
s
b‡
o
g
‡r
w
p
k
n
u‡
q‡
t
ti1498ax
Key
a Main Air Supply Line
b‡ Ventilation Fan Interlock Solenoid Valve
c‡ Main Air Supply Shutoff Valve (bleed-type)
d Pump Air Line Filter/Water Separator
e‡ Pump Air Supply Shutoff Valve (bleed-type)
f Air Line Lubricator
g Air Pressure Regulator
hPump
j‡ Pump Ground Wire
k Fluid Filter
l Fluid Supply Line Shutoff Valve
m Fluid Pressure Regulator
n Fluid Supply Line
o Gun Air Line Filter/Water Separator
p Gun Air Supply Line Shutoff Valve (bleed-type)
q‡ Air Hose Ground Wire
r‡ Graco Grounded Air Hose
s Electrostatic Air Spray Gun
t Air Line Drain Valve
u‡ Fluid Drain Valve
vGun Air Inlet
w Gun Fluid Inlet
‡ These items are required for proper operation
and must be purchased separately.
NOTE: Solenoid valve (b) is not offered as a
Graco accessory.
10 312900G
Installation
Connect the Air Line
To reduce the risk of electric shock or other serious
injury, the air supply hose must be electrically connected to a true earth ground. Use only Graco
Grounded Air Supply Hose.
1. Connect the Graco Grounded Air Supply Hose (R)
between the air supply line and the gun's air inlet (V)
(F
IG. 2). The gun air inlet fitting has a left-hand
thread. Connect the air supply hose ground wire (Q)
to a true earth ground.
V
Q
To air supply
5. Install an air shutoff valve (P) on each gun air supply
line to shut off air to the gun(s).
Connect the Charging Probe
1. Apply dielectric grease to probe socket.
Probe
Socket
ti12722
FIG. 3
2. Press electrode on in Connect/Disconnect position
shown in F
3. Rotate electrode to spray position.
IG. 4.
Connect the Charging Electrode
R
ti1259
F
ti1259a
IG. 2
2. Install an air line filter/water separator (O) on the
gun air line to ensure a dry, clean air supply to the
gun. Dirt and moisture can ruin the appearance of
your finished workpiece and can cause the gun to
malfunction.
3. Install a bleed-type air regulator (G) on the pump
and gun air supply lines to control air pressure to the
pump and gun.
4. Install a bleed-type air valve (E) on the pump air line
to shut off air to the pump. Install an additional
bleed-type air valve (C) on the main air line (A) to
isolate the accessories for servicing.
The bleed-type air valve (E) is required in your system to relieve air trapped between the valve and the
pump after the air regulator is shut off. Trapped air
can cause the pump to cycle unexpectedly, which
can result in serious injury, including splashing fluid
in the eyes or on the skin.
Connect/Disconnect
Position
F
IG. 4
Spray
Position
NOTICE
The external charging probe rotates easily. Do not
press too hard when rotating it or it could be damaged.
NOTICE
For proper performance, do not operate electrostatics if the charging probe is not in spray position.
ti1933a
312900G 11
Installation
Connect the Exhaust Tube
Press the exhaust tube (38) onto the barbed adapter on
the bottom of the gun handle. Secure the tube with the
clamp (39) (F
IG. 5).
Barbed adapter
W
N
38
39
ti1275a
IG. 5
F
Connect the Fluid Line
1. Before connecting the fluid line (N), blow it out with
air and flush it with solvent. Use solvent compatible
with the fluid to be sprayed.
2. Install a fluid regulator (M) on the fluid line to control
fluid pressure to the gun.
3. Install a fluid filter (K) and drain valve (U) at the
pump outlet.
ti1277
F
ti1277a
IG. 6
5. Before running any paint through the spray gun,
flush it with a compatible solvent.
Filter the Fluid
Install a fluid filter (K) to remove particles and sediment
that could clog the spray nozzle.
The fluid drain valve (U) is required in your system to
assist in relieving fluid pressure in the displacement
pump, hose, and gun. Triggering the gun to relieve
pressure may not be sufficient. Install a drain valve
close to the pump's fluid outlet. The drain valve
reduces the risk of serious injury, including splashing
in the eyes or on the skin.
4. Connect the fluid line to the 3/8 npsm gun fluid inlet
(W) (F
IG. 6).
12 312900G
Installation
Select a Fluid Nozzle and Air Cap
The gun is supplied with Part No. 197266 Nozzle and
24A276 Air Cap. If you require a different size, refer to
Table 1 and Table 2 , and instruction manual 309419, or
consult with your Graco distributor. See Replace Air
Cap/Nozzle on page 28.
A wide pattern kit (P/N 24A431) is included with the gun
and if installed, will provide more fan air for wider spray
patterns. (If pattern becomes split, use the fan air valve
to reduce the amount of fan air.)
To reduce the risk of an injury, follow the Pressure
Relief procedure on page 19 before removing or
installing a fluid nozzle and/or air cap.
NOTE: Due to the larger needle diameter, use a nozzle
one size larger than you would use with a standard Pro
Xs gun (i.e., 1.5 mm = 1.2 mm flow area).
Table 1: Fluid Nozzles
Part No. Orifice Size
197265 1.2 mm (.047 in.)
197266 1.5 mm (.055 in.)
197267 1.8 mm (.070 in.)
249922* 1.2 mm (.047 in.)
249923* 1.5 mm (.055 in.)
249924* 1.8 mm (.070 in.)
* Glass-reinforced acetal construction.
Table 2: Air Caps
Pattern Shape
Part No.
24A438
24A279
24A276*
24A274
24A439
24A275
*Also available in the following colors:
24A376 - gray
24A277 - red
24A278 - green
and Length in.
(mm)
Round end;
15-17 (381-432)
Round end;
14-16 (356-406)
Tapered end;
17-19 (432-483)
Tapered end;
12-14 (305-356)
Round end;
11-13 (279-330)
Tapered end;
14-16 (356-406)
Recommended Fluids and
Production Rates
Light to medium viscosity.
Up to 15 oz/min (450 cc/min)
Medium to high viscosity and
high solids.
Up to 15 oz/min (450 cc/min)
Light to medium viscosity.
Up to 15 oz/min (450 cc/min)
Light to medium viscosity.
Up to 15 oz/min (450 cc/min)
Medium to high viscosity and
high solids.
Up to 15 oz/min (450 cc/min)
For use with 2.0 mm nozzle.
Light to medium viscosity and
high solids.
Aerospace coatings.
Up to 25 oz/min (750 cc/min).
312900G 13
Installation
Grounding
Fire, Explosion, and Electric Shock Hazard
When operating the electrostatic gun, any ungrounded
objects in the spray area (people, containers, tools,
etc.) can become electrically charged. Improper
grounding can result in static sparking, which can
cause a fire, explosion, or electric shock. Follow the
grounding instructions below.
The following are minimum grounding requirements for
a basic electrostatic system. Your system may include
other equipment or objects which must be grounded.
Check your local electrical code for detailed grounding
instructions. Your system must be connected to a true
earth ground.
• Pump: ground the pump by connecting a ground
wire and clamp as described in your separate pump
instruction manual.
• All persons entering the spray area: shoes must
have conductive soles, such as leather, or personal
grounding straps must be worn. Do not wear shoes
with non-conductive soles such as rubber or plastic.
If gloves are necessary, wear the conductive gloves
that are supplied with the gun. If non-Graco gloves
are worn, cut off fingers or palm area of gloves to
ensure your hand contacts the grounded gun handle.
• Object being sprayed: keep the workpiece hangers
clean and grounded at all times. Resistance must
not exceed 1 megohm.
• The floor of the spray area: must be electrically con-
ductive and grounded. Do not cover the floor with
cardboard or any non-conductive material which
would interrupt grounding continuity.
• Electrostatic Air Spray Gun: ground the gun by con-
necting the Graco Grounded Air Hose and connecting the air hose ground wire to a true earth ground.
See Check Electrical Grounding, page 15.
ti1259a
• Air compressors: ground the equipment according
to the manufacturer's recommendations.
• All air and fluid lines must be properly grounded.
Use only grounded hoses with a maximum of 100
feet (30.5 m) combined hose length to ensure
grounding continuity.
• Flammable liquids in the spray area: must be kept in
approved, grounded containers. Do not use plastic
containers. Do not store more than the quantity
needed for one shift.
• All electrically conductive objects or devices in the
spray area: including fluid containers and wash
cans, must be properly grounded.
14 312900G
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