Flushing; Proportioning Pumps - Graco Reactor H-25 Series Repair And Parts Manual

Flushing

Flush equipment only in a well-ventilated area. Do not
spray flammable fluids. Do not turn on heaters while
flushing with flammable solvents.
• Flush out old fluid with new fluid, or flush out old
fluid with a compatible solvent before introducing
new fluid.
• Use the lowest possible pressure when flushing.
• All fluid components are compatible with common
solvents. Use only moisture-free solvents.
• To flush feed hoses, pumps, and heaters separately
from heated hoses, set PRESSURE
RELIEF/SPRAY valves (SA, SB) to PRESSURE
RELIEF/CIRCULATION
lines (N).
SA
N
• To flush entire system, circulate through gun fluid
manifold (with manifold removed from gun).
• To prevent moisture from reacting with isocyanate,
always leave the system dry or filled with a
moisture-free plasticizer or oil. Do not use water.
312063Z
. Flush through bleed
SB
N
ti9880a

Proportioning Pumps

NOTE: See your proportioning pump manual for repair
instructions.
A
B
1. Shut off ,
2. Flush, page 27.
3. If pumps are not parked, press
until pumps stop.
4. Turn main power OFF
supply.
5. Shut off both feed pumps. Close both fluid inlet ball
valves (B).
6. Turn both PRESSURE RELIEF/SPRAY valves (SA,
SB) to PRESSURE RELIEF/CIRCULATION
Route fluid to waste containers or supply tanks.
Ensure gauges drop to 0.
SA
NOTE: Use drop cloth or rags to protect Reactor and
surrounding area from spills.
Repair
, and heat zones.
. Trigger gun
. Disconnect power
B
ti9883a
SB
ti9879a
.
27