Graco Reactor E-XP1 Troubleshooting Manual page 32

Reactor Error Code Trouble Shooting Guide
o If we can determine what chemical "A" or "B" is coming out of the gun, then we can
focus on the missing chemical side. This will immediately save us time by checking the
side that is lacking chemical or is the cause of our problem.
o First we need to understand that the restriction of the mix chamber impingement port
sizing creates the backpressure that we monitor at the fluid outlet gauges. Think of it as
holding your thumb over the end of the garden hose. The more we block, or "restrict" the
opening, the greater the backpressure we create.
2a) If "A" (ISO) side is lacking at the gun, and "A" side fluid gauge reading is higher than
the "B" side then this is an indication of restriction on the "A" side, anywhere from the gun
mix chamber back to the fluid outlet manifold.
Causes:
o Restrictions can include,
 blockage in the mix chamber,
 gun screen,
 whip hose,
 hose temperature sensor,
 main fluid line,
 manifold outlet.
o "A" side chemical is thicker than the "B" due to cold material or primary heater problem.
o "B" side mix chamber port has been increased by wear, reducing the "B" side back
pressure causing a resin rich, or too much "B" condition.
2b) If "A" (ISO) side is lacking at the gun, and "A" side fluid gauge reading is lower than
the "B" side, this is an indication of a problem from the fluid outlet gauge back to the "A"
drum feed supply.
Causes:
o Starving the supply with one of the following.
 Supply feed pump malfunction,
 Restriction of the feed hose or filter strainer,
 Drum is not properly vented due to bung cap in place or desiccant breather
clogged.
 Debris in the bottom of the drum container,
 Dented drum bottom restricting the feed pump inlet,
 "A" side proportioner pump has debris or a stuck ball in the inlet or discharge ball
check seat area.
 If circulating material back to the drum, the pressure relief/spray valve could be
leaking, or diverting pressure and material back to the drum.
Rev 2.6 (02/2014) Page 32