Trane Flex II Series Installation Operation & Maintenance page 41

Symptom Cooling
x
x
x
E The
compressor
does not start
x
because the
minimum
pressure switch
has tripped
x
x
x
x
x
F The fans do
not start
x
x
x
G Lack of gas
x
H Frost in the
liquid line
x
downstream
from a filter
x
x
I The unit
works
continuously
x
without ever
stopping
x
x
L The unit
works regularly
but with an
x
insufficient
capacity
Who can take
corrective action
U = User
S = specialised
personnel
Pressure switch out of order
s
Machine completely void of
s
refrigerant
Finned coil clogged, airflow rate
u
is too low
Water circulation pump blocked
u
Water circulation pump blocked
s
and defective
Presence of frost on the
s
evaporator coil
Evaporator fan not working
s
Refrigerant filter clogged
s
Expansion device that is not
s
working properly
Presence of moisture in the
s
refrigerant circuit
s Fan contactor de-energized
Lack of output voltage from the
s
control fan speed
Thermal protection inside the
s
fan
Fan motor faulty
s
Loose electrical connections
s
Loss in the refrigerant circuit
s
The filter is clogged
s
Lack of refrigerant gas
s
Incorrect tuning of the operating
u
thermostat
Excessive thermal load
s
Compressor does not give the
s
thermal output
The liquid filter is clogged
s
Low refrigerant charge
s
Probable cause
Check and replace.
See point G.
Remove dirt from the coil.
Unlock the pump
Check the pump and replace if
necessary
See point N.
See point F.
Check and replace.
Check and replace if necessary.
Replace the filter, dry and recharge
Check the voltage across the coil of
the contactor and the continuity of
the coil.
Check the contacts, replace if
necessary.
Check the condition of the fan and
the air temperature during operation
of the unit.
Check and replace.
Check and replace.
Check the cooling circuit using a leak
detector after pressurising the circuit
to approximately 4 bars.
Repair, evacuate and refill.
Replace the filter
See item G.
Check and set.
Reduce the thermal load
Check, change or revise
Replace.
See point G.
Possible remedy
41