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The purpose of this list of procedures is to simulate the most common problems and possible causes which may cause downtime or im-
proper operation of your SRS - Air Dryer.
The simplicity of some procedures for troubleshooting provides the means for the user to solve some of them without the interaction of
specialized Technical Assistance. Therefore, if problems persist after applying the listed corrective actions, get in touch with technical as-
sistance from an accredited Schulz Authorized-Technical/Distributor for this equipment.
EVENTUAL DEFECT PROBABLE CAUSE SOLUTION
The
compressed
air does not
dry (humidity
is present in
the line).
Needle valve is closed.
The condenser outlet from the air dryer is blocked,
flooding the heat exchanger and allowing the swept overflow to
enter the compressed air network.
Check if the needle valve of the drain is sufficiently open. If not,
turn the valve handle counter clockwise to increase the
condensate flow during drain. It is not necessary to open the
valve completely, just as much
as necessary.
The drain system is blocked by dirt.
The presence of dirt or particles in the purge system can block the
condensate flow.
Depressurize and deenergize the dryer. After that,
disassemble the drain system and clean it, then reassemble it.
If any doubts arise on how to perform the cleaning process,
get in touch with the Schulz Authorized Dealer.
Solenoid valve of the drain does not work.
The solenoid valve piston drags or the coil is burned so the
component does not function.
Get in touch with Schulz
Authorized-Technical/Distributor.
High temperature of compressed air.
Air Temperature in the input line to the dryer is extremely high (over
38°C) that is over the cooling capacity of the equipment.
Check the output temperature from the air compressor.
Perform the cleaning of the radiator or after cooler
(if present).
High room temperature.
Room temperature is very high (over 38°C),
decreasing the capacity for thermal exchange from the condenser and
harming the efficiency of the air dryer.
Check if the room temperature 38°C. If it is, provide the means
to decrease the temperature. For assistance, get in touch
with Schulz Authorized- Dealer.
Thermal protector for the refrigeration compressor is activated. Refri-
geration compressor is turning off due to very high temperature. The
system does not have enough refrigerant or it is overloaded.
Check if the refrigeration compressor is turning off during
its operation. This is noticed through an increase in
temperature and shows on the digital controller for values over
15°C. If this happens, get in touch with Schulz Authorized Dealer.
Air flow is over the equipment capacity.
The quantity of air supplied to the dryer is
over its capacity.
Get in touch with Schulz Authorized Dealer to check if the air dryer is
correctly dimensioned.
Extra long or very small diameter purge hose.
Difficulty in expelling the condensate from the purge system.
Install hoses with a maximum length of 4 meters and in
internal diameter of a least 5/16”.
A single drain hose for several dryers.
This can interfere with the correct purging of the equipment.
Use separate hoses for each purge system, if there is more
than one dryer installed.
Dryer does
not start
Breaker switch tripped because of short circuit or improper power
supply.
Power supply is short circuited and does not let the dryer activate.
Get in touch with Schulz
Authorized-Technical/Distributor.
Temperature sensor is disconnected, broken, or short-circuited.
In any of these conditions, the electronic controller does not let the
dryer activate.
Check if the electronic controller shows some errors mentioned
on Table 12.1, of this manual. If it shows get in touch
with Schulz Authorized Dealer.
Electronic controller is not set correctly.
This does not let the dryer activate.
Check if the controller “OK” led is lit. If not get in touch with
Schulz Authorized Dealer.
Dryer turns off
for no reason.
It turns off because of the high pressure switch.
If the compressed air temperature to the inlet
of the dryer is very high (over 38°C) excessive increases in
condensate pressure making the high pressure pressostat
activate.
Check if the compressed air temperature is over 38°C. If it is,
provide the means to reduce the temperature. If the system
has a cooler before the dryer check if it too dirty. Get in touch
with Schulz Authorized Dealer.
It was turned off by the high pressure switch.
If the room temperature is very high (over 38°C) the thermal exchange
in the condenser will be harmed and the condenser will
cause high pressure in the pressostat.
If it is, If the room and apply corrective measures to reduce
the temperature and for assistance get in touch with
the Schulz Authorized Dealer.
It was turned off by the high pressure switch. If the condenser is dirty,
the air discharge will be blocked and not allow the heat exchange
with the room temperature and make the condensation
pressure rise.
Clean the condenser as stated
on of this manual.
It was turned off by the high pressure switch.
The fan(s) turn on and off as the equipment needs. This can occur and
the fan remains turned on, but if (it/they) (do /does)not turn on at any
given moment until the dryer turns off for no reason, it is possible
that there is some problem in the electric circuit of the blocked
electric rotor or a defect in the motor(s).
Get in touch with Schulz
Authorized-Technical/
Distributor.
17. FAILURE DIAGNOSTICS
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