Delta 20-140 Service Manual download pdf (Page 11)

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Setup

C. Test the spray pattern and atomization while keep-

ing the gun a consistent distance, about 6 to 8 in-

ches (150 to 200 mm), from the test piece.

D. If the spray pattern is too wide, reduce the fan air

pressure (or slightly close the fan adjustment valve

on manifold 243950).

NOTE: Reducing the fan air pressure to 0 psi (or

fully closing the fan adjustment valve) will produce

a round pattern.

E. Check the atomization quality again. Increase the

gun air supply pressure with the air pressure regu-

lator in 5 psi (34 kPa, 0.3 bar) increments until you

obtain the desired atomization.

F. If after increasing the gun air supply pressure the

atomization is still unacceptable, try installing a

larger fluid nozzle size to reduce the fluid velocity.

Repeat steps 6-B to 6-E until you obtain the

desired atomization.

Pressure Drop Chart

(for separate fan and atomizing air supplies)

5/16 inch (7.9 mm) I.D. hose

Recommended hose size to minimize excessive pressure drop. Expected pressure drops measured using 25 ft.

(7.625 m) long hose, with gun triggered.

Atomizing Air Regulator

Pressure Setting

psi (kPa, bar)

Atomizing Gun Inlet

Pressure

psi (kPa, bar)

Fan Air Regulator

Pressure Setting

psi (kPa, bar)

Fan Gun Inlet Pressure

psi (kPa, bar)

13.0 (91, 0.9) 10 (70, 0.7) 11.5 (80, 0.8) 10 (70, 0.7)

24.0 (168, 1.7) 20 (140, 1.4) 23.0 (161, 1.6) 20 (140, 1.4)

34.8 (244, 2.4) 30 (210, 2.1) 34.5 (241, 2.4) 30 (210, 2.1)

46.0 (322, 3.2) 40 (280, 2.8) 46.9 (328, 3.3) 40 (280, 2.8)

57.0 (399, 4.0) 50 (345, 3.4) 56.8 (398, 4.0) 50 (345, 3.4)

68.0 (476, 4.8) 60 (410, 4.1) 68.0 (476, 4.8) 60 (410, 4.1)

79.5 (556, 5.6) 70 (490, 4.9) 79.4 (556, 5.6) 70 (490, 4.9)

90.0 (630, 6.3) 80 (560, 5.6) 90.3 (632, 6.3) 80 (560, 5.6)

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Delta 20-140 Service Manual Page 11

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