Hydra-Flex Aqua-Lab EVO User Manual - Manual (Page 11)

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Troubleshooting
Injector Vacuum Check (for troubleshooting injectors)
1. At the Chem-Flex injector, remove the chemical feed line from the injector hose barb.
2. Attach the tubing of the vacuum gauge to the Chem-Flex hose barb
3. With the pump(s) on, manually activate the chemical that is to be tested at the main car wash control cabinet. An
injector that is working properly will have a reading greater than or equal to (≥) 20 in Hg
4. If injector is not functioning:
a) Check metering tip for clogs (can be tested with no metering tip to ensure injector is performing)
b) Try smaller injector (this will produce less flow and thus less backpressure)
c) Remove a nozzle(s) at the arch, allowing water to free flow (this will reduce backpressure)
5. Repeat steps 2-4 for each chemical lane that a vacuum reading is needed for.
6. Once testing is complete, turn off the AQUA-LAB pump from the main car wash control cabinet.
There is a variation of performance in the injectors that comes from slight variations in the dimensions of the parts and in assembly that are
unavoidable. It is common to see the resultant vacuum range from 20 in Hg all the way up to 28. There is also variation in the through hole size on the
meter tips from Dema (within their manufacturing tolerances). Using the same tip color from site to site is a good starting point. However with the
potential for variation from part to part it is reasonable to still need to do some adjustments from there.
Injector Issues
Problem Potential Causes Solutions
Injector is not
drawing chemical –
PASSES vacuum
pressure check
Clogged chemical feed Check chemical hose, foot valve, metering tip and
hose barb for debris or clogs
Injector is not
drawing chemical –
FAILS vacuum
pressure check
Too much back pressure on injector Clean or replace downstream check valves,
increase nozzle size or quantity, use larger tubing,
or use smaller flow injectors
Clogged injector check valve Blow compressed air through the chemical hose
barb on the injector to remove debris
Clogged injector nozzle Remove injector and blow out any debris with
compressed air
Defective Injector Replace injector
Product Specific – Sonny’s Rain Bar Remove elbow at inlet to foam generator and
remove nozzle
Manifold Inlet Clogged (rare) Remove end fittings and retention rod. Clean out
inlet holes to allow full flow.
No Flow from
injector
Valve malfunction, valve not opening Ensure minimum 60 psi on primary air regulator,
ensure valve receiving signal
Clogged injector Remove injector and blow out debris with
compressed air
No water supply Check that the system has a supply of water
Injector Stainless
Steel disintegrating
Strong Acid Call Hydra-Flex and order composite version of
injectors