User Manual Thermal X - R Series Chillers
Page 25
TROUBLESHOOTING
In the event the chiller develops a fault then the fault is displayed on the screen readout on the control
board. The faults displayed are comprehensive but not fully descriptive.
Symptom
Possible Causes Solutions
L
o
w
F
lo
w
Ala
rm
Faulty Pump
Replace Pump ensuring new pump has been leak tested, phase wiring is around
the right way
Blockage on
water circuit of
chiller
installation
Check water flow is coming back through to chiller. Water line isn’t isolated
down the line. Water strainer is clean and clear (if installed in water pipe work. If
plate pack evaporator is used check there is flow through the heat exchanger. If
blocked replace heat exchanger.
Faulty electrical contractors – check operation and replace if necessary
Work Around
Set water flow alarm and protection to 0 while you test unit. (if unit has plate
pack isolate compressors while testing)
Faulty Flow
meter
Check flow meter spindle if free and not stuck, flow meter has voltage (24vdc)
wiring connections are not loose. By-pass is not fully open.
Co
mp
re
ss
o
r
F
a
ult
High head
pressure – HP
alarm tripping
Check head pressures when the unit is running. Possible causes blocked
condenser – check for dust or debris build up and clean. Refer to “Poor Heat
Dissipation” section.
Dead or dying fan – check amp draw of fans or air flow. Replace if needed
Too high a heat load for the rating of the unit. Check install and site
specifications
Bad installation or too high ambient – check that there is no other equipment in
the vicinity that may be throwing heat onto the unit or that the unit has not been
installed improperly
Faulty HP transducer or HP switch - replace
Low pressure –
LP alarm
tripping
Flow rate from pump may be too low
TX valve may have seized
Unit may have developed a refrigeration leak and lost gas charge – check
pressures or run leak detector over the unit.
Outlet water temperature and evaporator temperature too low. Check whether
there is a lack of water in the water tank and whether the circulating pump is
running well. If those are normal, reset the low pressure switch or restart the unit.
If the evaporator is frozen, input warm water to melt the ice. Do not attempt to
break the ice off with force.
Work Around
Motor protection module in compressor tripped
Motor running too hot – return water may be too high in-rush of heat load.
Compressor drawing too much current
Multi
compressors
For multiple compressor units, Second compressor should still be running and
carrying much of the heat load. Once the faulty compressor is fixed then the
programming will have to be updated as the program will have defaulted to
another setting to keep the unit running.
On the screen go to “PARAMETERS MENU” and press “OK”
Scroll to SWITCH ON FOR NEXT C” – “TIMER” should be showing
underneath this. Press “OK” and scroll to “FIXED HEAT LOAD” and press
“OK”. The screen should confirm your choice
No
P
o
wer
Main breaker
off
Check main breaker is on, If on and no power have a qualified person test power
to the unit.
P
CB
bla
nk
No mains power
Check main breaker is on, If on and no power have a qualified person test power
to the unit
No control
voltage
Check PCB has 24vdc to controller. If power is present replace PCB
