Graco Therm-O-Flow 20 EasyKey Instructions Manual page 30

Operation
4. Push and hold the blow-off air pushbutton (S). The
platen will begin to raise.
T
S
5. When platen is clear of the pail, increase the ram up
pressure to 10-15 psi (69-103 kPa, 0.69-1.03 bar) to
continue to raise the heated platen.
Never reach under the heated platen after it leaves
the pail. Serious burns could result from dripping
material.
6. Follow the steps in Material Loading (page 23) and
Prime System (page 25).
7. After pail change, press the Pump Ready key
to reverse the air motor control.
8. Prime the pump.
It is only necessary to lubricate the platen seals on
initial material loading.
For tandem systems the Pump Ready
will turn the air motor on for approximately 5 min-
utes to prime the pump. This can be repeated as
necessary.
30
If both unloaders in the system are empty, the
pump ready and transition sequence will depend on
the unloader to transition to the Run state.
 Active unloader cleared. Inactive unloader empty.
•
TI8142A
 Inactive unloader cleared. Active unloader empty.
•
 Both unloaders cleared before pressing Pump
Ready.
•
key
•
•
Pressing the Pump Ready key
the active unloader is in the Heat On state
will cause the active unloader to transition
to the Run state.
Pressing the Pump Ready key
the inactive unloader is in the Heat On
state will cause the inactive unloader to
transition to the Ready state. The active
state can then be transitioned to the loaded
unit.
Pressing the Pump Ready key
the inactive unloader is in the Heat On
state will cause the inactive unloader to
transition to the Ready state. The Pump
Crossover key must be pressed to
transfer active unloader status to the
Ready unloader. Pressing the Pump Ready
key again while the now inactive
loader is in the Heat On state, will cause
the inactive unloader to transition to the
ready state.
Pressing the Pump Ready key
the inactive unloader is in the Heat Off
state and the active unloader is in the Heat
On state will cause the active unloader to
transition to the Run state.
This sequence is required to force the user
to only engage one unloader at a time. This
prevents accidental pumping of air into the
system.
while
while
while
while
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