Graco Aerobotix RC50, Instructions Manual

Page: 53 / 66

Pressure Relief Procedure
313813A 53
Pressure Relief Procedure
Before performing system maintenance, system pres-
sure must be relieved.
Air Pressure Relief
1. Turn off and lockout main power.
2. Close day tank incoming air supply valve (MK). See
Tanks section on page 32.
3. Disconnect air supply hose from water
separator (MG). See
Tanks section on page 32.
4. Bleed air pressure from system by opening the
pressure relief valve (MB) on top of each day tank.
See
Tanks section on page 32.
5. Ensure there is no air pressure in the tanks by look-
ing at the pressure gauges mounted on the tanks.
Chemical Line Pressure Relief
1. Turn off and lockout main power.
2. Relieve tank air pressure. See Air Pressure Relief
procedure.
3. Ensure there is no pressure in the chemical lines by
looking at the pressure gauges mounted above the
main panel.
NOTICE
Relieving air pressure in the machine means that the
supplied dry air will be replaced by moist, room air. Do
not leave the machine exposed to moist air for more
than 30 minutes.
If the machine must be left without air pressure for
more than 30 minutes, the day tanks must be emptied
and thoroughly flushed. See
Long-Term Shutdown
on page 44.
See F
IG
. 17 on page 32.
When the metering pump motors are turned off, all
chemical line pressure is relieved except for the
pressure coming from the tank blanket air pressure.