© Hydra-Flex, Inc. 2017
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PROBLEM
POTENTIAL CAUSED
SOLUTIONS
Injector is not drawing chemical - Fails
Vacuum Pressure check test
Too much back pressure on injector
Perform back pressure check test out-
lined in Section IV if this manual. If the
result is higher than 66 psi then Increase
arch nozzle size or quantity, use larger
tubing, or use a smaller flow injector
Clogged injector check valve
Blow compressed air through the chem-
ical hose barb on the injector to remove
debris
Clogged injector nozzle
Remove injector and blow out any debris
with compressed air
Defective Injector
If Vacuum check fails but Back Pressure is
less than 66 psi, replace the injector
System won’t regulate up to 200 psi
Debris in regulator
Remove regulator and clean out debris
Opening to many valves at once
System is limited to opening up to 8
valves at once or pressure will be greatly
affected by so much demand
Pump not primed
Follow priming instructions
Defective Check Valve
Replace check valve if broken
Defective Regulator
Replace Regulator
Defective Pump
Replace Pump
Flow at arch is too low
Incorrect Injector Flow Rate Selection
Replace with desired injector size
System pressure too low
Ensure system pressure is set at 200 psi
Downstream pluming restrictive
Perform Back pressure test outlined in
Section IV of this manual, if over 66 psi,
increase tube size and reduce elbows,
turns or other restrictive plumbing
No flow from injector
Solenoid valve malfunction
Ensure valve is receiving the correct
electrical signal and voltage
Disassemble valve and clean out debris
(See valve replacement instructions)
Clogged Injector
Remove injector and blow out debris
with compressed air
No water supply
Check that the system has a supply of
water
Valve stuck open – Staying open when
signal is off
Debris in valve seat
Remove and clean valve (See valve
replacement instructions)
VALVE REPLACEMENT INSTRUCTIONS
Remove malfunctioning valves from the manifold making sure to unscrew it from the larger steel hex
closest to the plastic body. On a clean work surface disassemble the valve assembly. Be cautious with the
small components and noting how it is assembled. Inspect for debris that could interfere with the valves
operation, paying particular attention to anything blocking the two small holes through the valve piston
(2nd part from the left in the image below). For and correct assembly reference the image below.
