9
R
TROUBLESHOOTING
9. TROUBLESHOOTING
PROBLEM POSSIBLE CAUSES POSSIBLE CORRECTIVE STEPS
Fluid outlet
temperature
on cooler (gas
pressure on
condenser) stays
high, won't come
down.
The system does not spray water
and pump is not running.
1. Check if Status on Main Status screen is ON. If not, switch the
system ON and check for alarms and continue troubleshooting.
2. Check Offsets. They should be at zero during normal operation or
can be used to simulate FT and OT to create a Cooling demand.
Refer to page 28 of the adiabatic controller programming
manual.
3. Check that cooling demand (CD) on Main Status Screen is at
least 10%. Adjusted to 10% by default, refer to page 18 of the
Adiabatic Controller programming manual.
4. On Main Status screen, check if drain valve and water treatment
system are CLOSED and ON. If not, you may need to wait for OT
to increase above Drain temp + Drain temp Band (or for tests,
insert OT Offset to simulate the condition). Refer to page 27 for
Drain Temp. and page 28 for Offets and Drain temp. Band of the
adiabatic controller programming manual.
5. Check that no critical alarm is triggered, such as FT or OT sensor
failure, Water inlet LPS alarm or Water high pressure. Identify alarm,
x condition and reset alarm by following instructions on page 32 of
the adiabatic controller programming manual. Check that the cooler
(or condenser) switches the interlock to call for the system to run.
The system sprays water and pump
is running.
1. Check coils for blockage.
2. Check if cooler/condenser fans are all running at full speed.
3. Check if there is excessive water dropping from the spraying
system. If not, increase amount of water delivered to the nozzles.
Refer to the Operation Principle/Sequence of Operation section
of the adiabatic controller programming manual to understand
your conguration and adjust the amount of water by following
instructions on page 17 to page 19. The amount of water
should be enough to make the uid/gas temperature (FT) or
pressure decrease while avoiding too much water dropping from
the cooler/condenser coil.
On the main status
screen, uid tem-
perature reading
(FT) displays an
abnormal reading,
completely out of
range
Badly programmed offset or faulty
sensor.
1. Check FT offset, return offset to zero. Refer to page 28 of the
adiabatic controller programming manual to adjust offsets.
2. Check FT sensor wires, one should be on B2 (port J2) and the other
one on Ground (port J2); no other wire should be in contact with the
wire on B2 (port J2).
3. Check sensor and wiring. Look for open wire or short. Disconnect
wires from B2 and Ground (port J2), read resistance, should be
around 10 Kohms at 25
o
C, 27K ohms at 0
o
C. If reading open,
replace sensor.
On the main status
screen, the outside
temperature reading
(OT) displays an
abnormal reading,
completely out of
range.
Badly programmed offset or faulty
sensor.
1. Check OT offset, return offset to zero. Refer to page 28 of the
adiabatic controller programming manual to adjust offsets.
2. Check OT sensor wires, one should be on B1 (port J2) and the
other one on Ground (port J2); no other wire should be in
contact
with the wire on B1 (port J2).
3. Check sensor and wiring. Look for open wire or short. Disconnect
wires from B1 and Ground (port J2), read resistance, should be
around 10 Kohms at 25
o
C, 27K ohms at 0
o
C. If reading open,
replace sensor.
To Next Page
Loading...