Service - Graco Therm-O-Flow Series Instructions-Parts List Manual

Pressure Relief Procedure
WARNING
HOT SURFACE AND FLUID HAZARD
The material and equipment will be hot!
To reduce the risk of injury, wear eye
protection, gloves and protective clothing
when installing, operating, or servicing this
dispensing system.
SKIN 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, or
moving parts, follow the Pressure Relief
Procedure whenever you:
• are instructed to relieve the pressure
• stop spraying/dispensing
• install or clean the nozzle
• check or service any of the system
equipment
PRESSURIZED FLUID HAZARD
High pressures can cause serious personal
injury. Be sure to open the dispense valve
during system heat-up to alleviate pres-
sure which might occur in the system due to
material expansion.
310538N

Service

This procedure describes how to relieve pressure from
the automatic dispense valve. See your supply unit or
system documentation for instructions on relieving
pressure for the entire dispensing system. Use this
procedure whenever you shut off the dispense valve
and before checking or adjusting any part of the system,
to reduce the risk of serious injury.
1. Shut off the material supply.
2. Shut off electrical power to the automatic dispense
valve.
3. Close all self bleeding air supply valves for supply
unit.
4. Have a container ready to catch the drainage, then
bleed off material pressure by actuating the dis-
pense valve.
5. Shut off air supply to valve.
NOTE: If you suspect that the nozzle or hose is com-
pletely clogged, or that the pressure has not been fully
relieved after following the steps above, very slowly
loosen the tip guard, retaining nut or hose end coupling
to relieve pressure gradually, then loosen completely.
Then clear the tip/nozzle or hose.
Service
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