System Heat Up; Prime System - Graco Therm-O-Flow 20 EasyKey Instructions Manual

System Heat Up

Never pressurize a hot melt system before turning on
the heat. The air will be locked from the air motor until
all temperature zones are within a preset window of
the temperature set points.
CAUTION
The dispense valve must be kept open over a waste
container while the system is heating up and also
when cooling down. This will prevent a pressure
build-up caused by fluids or gasses expanding from
the heat.
Operate at the lowest temperature and pressure
necessary for your application.
1. Turn the main disconnect on the electrical control
panel door to the ON position.
POWER
ON
. Display status bar reads System On
2. Press
and Heat Off.
3. Press . The zones begin to heat (provided they
are enabled). Display status bar reads Heat On.
When temperature reaches setpoint, display status
bar reads either Run Mode or Heat Soak, depend-
ing on user setting.
The air will be locked from the air motor until all
temperature zones are within a preset window of
the temperature set points, allowing the system to
heat fully and complete the material heat soak
period.
312094K
TI8138A

Prime System

In a Tandem system, after a pail change has
occurred on the inactive unloader, pressing the
Pump Ready
to the air motor to allow for the pump to be primed.
The inactive unloader must be within its warning
deviation setpoints and in the Ready or Heat On
state. If the five minute timer runs out before the
inactive unloader is primed, pressing the Pump
Ready key again will repeat the air to the air motor.
1. Make sure the system has completed the approxi-
mately 45 minute heat soak cycle and is up to tem-
perature.
2. Close the air motor valve (D).
D
3. Adjust the air motor air regulator (C) to approxi-
mately 20 psi (138 kPa, 1.38 bar) on pneumatic
panel.
C
key will allow five minutes of air
TI10094A
TI8142A
Setup
25