System Component Information

VIII. Using the Air Regulators and Needle

1.
2.
3.
4.
5.
valve
See Fig. 5.
Always open air and fluid regulators slowly to pre-
vent surging during startup.
The air regulator (6a) on the right side of the pump
controls air to the pump, and the regulator (6b) on
the left side controls air to the gun.
To open the air regulator, pull out the adjusting
knob. Turn the knob IN (clockwise) to open, and
turn the knob fully OUT (counterclockwise) to
close. You may push the adjusting knob in to lock
the adjustment.
The fluid regulator (44) controls fluid from the
pump to the gun. For an accurate setting, adjust
the fluid regulator only when the gun is triggered,
and fluid is flowing through the regulator. Be sure
the jam nut (H) under the T-handle does not inter-
fere with your adjustments. Tighten the jam nut to
lock in the setting, if desired.
To open the fluid regulator, which allows fluid to
flow, turn the T-handle IN (clockwise).
The needle valve (5), located on the fluid return
side of the circulating system, acts as a flow con-
trol. Use it to balance the pressure of the circulat-
ing fluid so that the pump circulates a sufficient
volume of fluid without running too fast or too slow.
Trigger the gun while adjusting the needle valve.
Turn the needle valve handle IN (clockwise) to
restrict fluid and slow down the pump. Turn the
needle valve handle OUT (counterclockwise) to
allow more flow, which. speeds up the pump.
-
A

CAUTION

Never close the needle valve completely. Doing so
prevents circulation, which can cause the fluid to
overheat, damaging the fluid and the heater.

.6b

A

1
Not visible in this view
Fig. 5

IX. Using the 3-Way Valve

See Fig. 6.
Heated systems require that the fluid circulate
constantly when the heater is turned on. The 3-way
valve (9) supplied with this system enables you to
drain or circulate the fluid. The words Drain and Circu-
late are marked on the valve.
In the Drain position, and with the gun untriggered,
the fluid returns from the gun, to the needle valve
(5), to the hose (12), and to the 3-way valve, which
directs the fluid out the drain hose (13). This posi-
tion is used when flushing the system and when
relieving system pressure.
In the Circulate position, with the gun untriggered,
fluid returns from the gun, to the needle valve (5),
to the hose (12), and to the 3-way valve, which
directs the fluid back into the pump intake. This
position is used during normal operation, and it
helps keep the fluid at a constant temperature.
308-448 7