Operation; Pressure Relief Procedure; Raising And Lowering The Ram - Graco Therm-O-Flow 5 Instructions-Parts List Manual

Pressure Relief Procedure

WARNING
MOVING PARTS HAZARD
Follow the Pressure Relief Procedure
below before checking or repairing the
ram or any other part of the system and
when shutting down the system. Keep hands and
fingers away from the follower plate, fluid pump
inlet, and lip of the fluid container when raising or
lowering the ram to reduce the risk of pinching or
amputating hands or fingers.
During operation, also keep hands and fingers
away from limit switches to reduce the risk of
pinching or amputating hands or fingers.
WARNING
The material and equipment will be
hot! To reduce risk of injury, wear eye
protection, gloves and protective clothing
when installing, operating, or servicing
this dispensing system.
WARNING
HIGH PRESSURES CAN CAUSE SE-
RIOUS PERSONAL INJURY. Be sure
to OPEN THE DISPENSE VALVE
DURING SYSTEM HEATUP to allevi-
ate pressure which might occur in the system due
to material expansion.
WARNING
INJECTION HAZARD
The system pressure must be manually
relieved to prevent the system from
starting or spraying accidentally. Fluid
under high pressure can be injected through the
skin and cause serious injury. To reduce the risk of
an injury from injection, splashing fluid, moving
parts, follow the Pressure Relief Procedure
whenever you:
D are instructed to relieve the pressure
D stop spraying/dispensing
D check or service any of the system equipment
D install or clean the spray tip/nozzle

Operation

This procedure describes how to relieve pressure for
the supply unit. Use this procedure whenever you shut
off the dispenser/sprayer and before checking or
adjusting any part of the system, to reduce the risk of
serious injury.
1. Lock the gun/valve trigger safety.
2. Shut off the main air supply to the pump.
3. Close all air bleed valves.
4. Unlock the gun/valve trigger safety.
5. Hold a metal part of the gun/valve firmly to the side
of a grounded metal drumpail, and trigger the
gun/valve to relieve pressure.
6. Lock the gun/valve trigger safety.
7. Have a container ready to catch the drainage, then
open the drain valve or pump bleed valve.
8. Leave the drain valve open until you are ready to
spray/dispense again.
If you suspect that the spray tip/nozzle or hose is
completely clogged, or that pressure has not been fully
relieved after following the steps above, very slowly
loosen the nozzle retaining nut or hose end coupling to
relieve pressure gradually, then loosen completely.
Now clear the tip/nozzle or hose.
9. If you want to relieve pressure in the ram, see the
Ram Pressure Relief Procedure on page 31.

Raising and Lowering the Ram

The ram hand valve on the ram air control has 3
positions [Fig. 3 (4-regulator version shown)]:
D Ram UP raises the ram
D Ram DOWN lowers the ram
D Ram OFF puts the ram in "neutral." Moving the
hand valve to OFF does not change the position of
the ram, but it stops the air pressure from attempt-
ing to move the ram either up or down.
Fig. 3
Ram UP
Ram OFF (neutral)
Ram DOWN
7979A
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