Isoguard Select ™ System - Graco HFR Setup And Operation

Maintenance
IsoGuard Select
Check the condition of the A (Red) pump IsoGuard
Select fluid daily. Change the fluid if it becomes a gel, its
color darkens, or it becomes diluted with isocyanate.
Gel formation is due to moisture absorption by the pump
IsoGuard Select fluid. The interval between changes
depends on the environment in which the equipment is
operating. The pump lubrication system minimizes
exposure to moisture, but some contamination is still
possible.
Fluid discoloration is due to continual seepage of small
amounts of isocyanate past the pump packings during
operation. If the packings are operating properly, Iso-
Guard Select fluid replacement due to discoloration
should not be necessary more often than every 3 or 4
weeks.
To change pump IsoGuard Select fluid:
1. Perform Pressure Relief Procedure on page 66.
2. Remove fittings from IsoGuard Select fluid cylinder
inlet and outlet ports. Keep supply tube (ST), return
tube (RT), and leak management tube (LT) con-
nected to the fittings.
3. Carefully place ends of tubes with fittings still con-
nected into an empty pail to drain IsoGuard Select
fluid.
4. Lift the IsoGuard Select fluid reservoir (LR) out of
the bracket (RB) and remove the container from the
cap. Holding the cap over a suitable container,
remove the inlet check valve and allow the IsoGuard
Select fluid to drain. Reattach the check valve to the
inlet hose. See F . 27.
IG
5. Drain the reservoir and flush it with clean IsoGuard
Select fluid.
6. When the reservoir is flushed clean, fill with fresh
IsoGuard Select fluid.
7. Thread the reservoir onto the cap assembly and
place it in the bracket (RB).
8. Push the supply tube (ST) approximately 1/3 of the
way into the reservoir.
74
™
System
9. Push the return tube (RT) into the reservoir until it
reaches the bottom.
NOTE:
The return tube must reach the bottom of the reservoir,
to ensure that isocyanate crystals will settle to the bot-
tom and not be siphoned into the supply tube and
returned to the pump.
F . 27: IsoGuard Select Fluid System
IG
Prime IsoGuard Select Fluid Cylinder
Ensure that the IsoGuard Select fluid cylinder outlet
faces upward for air to exhaust.
1. Install IsoGuard Select fluid cylinder inlet fitting and
inlet tube into bottom of cylinder. The inlet tube is
the tube with a check valve installed in it which
points in the direction of flow towards the IsoGuard
Select fluid cylinder.
2. Install IsoGuard Select fluid cylinder outlet fitting
and outlet tube into top of cylinder. The outlet tube is
the tube with a check valve installed in it which
points in the direction of flow away from the Iso-
Guard Select fluid cylinder.
3. Remove check valve from end of outlet tube.
4. Use funnel to pour IsoGuard Select fluid into tube to
fill cylinder.
5. With check valve arrow pointing away from the Iso-
Guard Select fluid cylinder, install check valve in end
of outlet tube.
6. Install tubes into reservoir and install reservoir into
holder.
24C352_313998_8e
313997A