Operation; Daily Start-Up Procedure - Graco Gusmer H-20 Pro Operation

Operation

Daily Start-up Procedure

This procedure describes normal operation. Assume all
calibrations have been correctly executed and heating
system is not at operating temperature.
1. Check condition of hydraulic and isocyanate lubrica-
tion systems and service as required. Change pump
lubricant when it shows signs of color change.
2. Ensure supply system is at correct temperature as
recommended by chemical system supplier. Also
ensure individual chemicals are correctly mixed
within their drums/day tanks, and moisture protec-
tion system is properly set for operation.
3. Check inlet screens and service as required.
4. Turn on main air supply to transfer pumps.
5. Open A- and B-inlet supply valves.
6. If red emergency stop switch has been activated,
turn knob to reset it.
7. Turn ON red main disconnect; white main power
light will illuminate.
8. Turn ON amber control power switch; light within
switch will illuminate.
CAUTION
Uncoil heated hoses before turning on hose heater
switch to prevent overheating and hot spots within
hose.
9. Turn ON green hose heater switch; light within will
illuminate. Temperature controller will cycle toward
set point. If you need to change set point, see Digi-
tal Temperature Controllers, page 20.
10. After hose comes up to temperature, turn ON green
A- and B-heater switches; lights within switches will
illuminate. Temperature controllers will cycle toward
311392C
set point. If you need to change either set point, see
Digital Temperature Controllers, page 20.
Primary heating ramps up at 10°F (5.5°C) per
minute. Do not turn on primary heaters until
required for operation. Turn off primary heaters dur-
ing shutdowns that exceed 30 minutes.
To prevent excessive pressure build-up in heated hose,
bring hose up to set point temperature before turning
on hydraulic system.
11. Turn ON green hydraulic motor switch; light within
switch will illuminate.
12. Turn pump switch to NORMAL. One of the amber
lights will illuminate and proportioning pumps will
move a short distance and pressurize.
13. Adjust hydraulic pressure as required. See Hydrau-
lic Pressure Control section of Component Identifi-
cation, page 8.
14. Check pressure of each proportioning pump:
a. Ensure pump switch is set to NORMAL, and
monitor both pressure gauges. Resin and isocy-
anate pressures should be approximately equal
and pressures must remain fixed.
b. Set pump switch to RETRACT and monitor both
pressure gauges; they must remain fixed. If
pressure bleeds off on either stroke, see the
Troubleshooting section of the Service and
Repair Manual (311393).
Pump switch must be in NORMAL or RETRACT
position to adjust hydraulic pressure.
15. Proportioning unit is ready for operation. Connect
air supply to spray gun. See Spray Gun Operation
Manual for instructions.
Operation
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