User Manual Thermal X - R Series Chillers
Page 26
C1
F
L
T
F
a
ult
Safety switch
open
Check operation of safety switches (circuit that connects to input 2) Check Hp,
LP, water level switches are made. Fan/pump and compressor overloads are
made.
Work Around
Bridge out components one after the other and test to see when unit doesn’t trip.
H
P
F
a
ult
Faulty Fans
Check operation of condenser fans. Replace if faulty.
Condenser coil
dirty
Check condition of condenser is clean and air moves through freely over coil.
Ambient
Temperature to
High
Ambient temp to high. Condensing temp to be brought down. (Spray coils with
water)
Faulty
transducer
Check operation of transducer/ reading correctly
LP
F
a
ult
Low refrigerant
charge
Check refrigerant system operation, check super heat and sub cooling are with in
normal operating ranges
Faulty Tx Valve
Check operation of Tx valve (opening and closing as required)
Low water flow
Check water flow through plate pack heat exchanger is sufficient
Water fouling
Check buffer tank and coil water is clean and coil not coated in mud/debris
Faulty
transducer
Check operation of transducer/reading correctly
Hi
gh
Ret
urn
Wa
ter
T
emp
Faulty Probe
Check probe operation/Re-calibrate sensor, replace probe
Low refrigerant
charge
Check refrigerant system operation, check super heat and sub cooling are with in
normal operating ranges
H
ig
h
Su
pp
ly
Wa
ter
T
emp
Faulty probe
Check operation of transducer/reading correctly
Low refrigerant
charge
Check refrigerant system operation, check super heat and sub cooling are with in
normal operating ranges
H
ig
h
Ambi
ent
T
emp
Faulty probe
Check operation of transducer/reading correctly
Air Re-
circulation
Check condenser air is not recirculating back over the condenser coil
L
o
w
Ret
urn
Wa
ter
T
emp
Faulty probe
Check operation of transducer/reading correctly
Low Water
Flow
-Check water flow through plate pack heat exchanger is sufficient
- Check pump operation. Replace pump if at fault
Low refrigerant
charge
Check refrigerant system operation, check super heat and sub cooling are with in
normal operating ranges
Poor Heat Dissipation
While the condenser heat dissipation is poor, the compressor will be inefficient and the operating
current will be increased. When the chiller reaches the high pressure value (set depending on the
chiller type and refrigerant used), the high pressure switch will trip an alarm and the unit will stop
working. This can be caused by poor heat dissipation. For air-cooled chillers, confirm that the
condenser is not dirty or choked and have a good airflow. Once the above conditions are checked to
be in normal condition, clear the alarm. If the high pressure alarm is frequently occurring, clean the
condenser as soon as possible.
Low Refrigerant
If the pressure at the gauge is pressure low, it may indicate a shortage of refrigerant. Any leaks should
be filled, the dryer filter should be changed, and it should be drawing a vacuum again. Refill the
refrigerant after the above has been performed.
