Parker Hannifin Corporation
Industrial Gas Filtration and Generation Division
Haverhill, MA
• 1-800-343-4048
Parker Zero Air Generators
Models HPZA-3500, HPZA-7000, HPZA-18000, HPZA-30000
Bulletin TI-HPZA-3500H
Troubleshooting
All troubleshooting and service activities should be performed by suitable personnel using
reasonable care.
Symptom
Course of Action
No Flow From Generator
Check drains on prefilters
-
Remove drain tubing and hold finger over drain opening to allow pressure to build within housing.
-
Close (customer installed) inlet air valve and depressurize generator. Re-open valve.
-
Remove bowl from filter and rinse with warm water.
-
Replace automatic drain, P/N 21552.
Unplug generator, remove cover, and check for internal leaks.
Low Pressure At Outlet
Check inlet pressure. Pressure drop up to 4 psid (0.3 bar) is normal. Minimum inlet pressure is 40 psig (2.8 barg).
Check flow demand and
“Overflow”
LED. Flow demands in excess of capacity may cause high pressure
drop through generator.
Check generator for leaks.
“Overflow” LED illuminated/
Yellow THC LEDs illuminated
Check downstream flow demand.
If flow capacity of generator is exceeded, “Overflow” LED and yellow “THC” LEDs
will illuminate. An excessive pressure drop (greater than 4 psig/0.3 bar) may accompany an overflow situation.
If demand exceeds capacity, install a flow controller downstream from the generator.
No Power
Check power switch to ensure generator is turned on.
Check that the generator cord is firmly connected to the wall receptacle and the power receptacle on the unit.
Check the generator fuses
-
Unplug generator cord from wall and generator receptacle.
-
Using a small screwdriver, open the fuse drawer and check the fuses.
-
Change fuse if necessary
Warning: for continued protection against risk of fire, replace only with fuse of specified rating.
Check that voltage selector reading matches local electrical supply.
“Check
System”
LED Illuminated
Turn generator off and check all electrical connections inside. Re-start generator.
(solid)
“Check
System”
LED blinking
Replace hydrocarbon removal module. Call local representative to order replacement module and request Return
frequently
Authorization for spent module.
If you have followed the above procedures and are still having trouble, please call Technical Support at 1-800-343-4048 or
email at
(For other locations, please contact your local representative. Please have the se rial
number available.
