Lennox FLEXY II Series Installation, Operating And Maintenance page 95

MAINTENANCE DIAGNOSTIC
ELECTRICAL HEATER
FAULT
High Temperature trip
out on electric heater
WATER LEAKS
FAULT
Low air pressure in the compartment due to a
high airf low rate or a high pressure drop before
Water found in the
v entilation section
Water ingress in the Water ingress through a leaking fresh air hood or
f ilter compartment
DC50 & DS50
FAULT
DC50: Nothing is
written on the screen
but it's enlightened
DS50: Nothing is
written on the screen
but it's enlightened
Nothing occurs on the
unit or an option
disappeared
DS50 & DC50: the
message "No Link"
appears
All the units are extinct
IOM – FLEXY II – 1007 – E
POSSIBLE CAUSE AND SYMPTO MS
Low airf low rate
Incorrect position of the Klixon
POSSIBLE CAUSE AND SYMPTO MS
Cooling mode:
Water carried away f rom the coil because of
excessiv e airf low and speed on the coil.
the f an
Check seals around the v entilation section.
when running 100% f resh air
POSSIBLE CAUSE AND SYMPTO MS
Problem of addressing pLAN on the DC50
Idem
Possible problem of units' conf iguration
Problem of addresses' recognition
Problem BM50 pLAN addressing
SOLUTION
Measure and estimate the airflow and pressure
and compare with the specification from
customer.
Check that the Klixon, is positioned in the airf low,
relocate Klixon if necessary
Check that there is no heat transf er f rom the
Klixon support.
SOLUTION
Estimate the airflow rate and check the speed is
lower than 2.8 m/s
Check f ilter
Reduce airflow rate
Check the door seal
Check f or the presence of silicone seals in the
corners of the door and at the bottom of the
ref rigeration section bulkhead.
Check the seals and f langes in the f resh air hood
Reduce the airflow rate if necessary
SOLUTION
Press on the three right-hand side's buttons at
the same time during a f ew seconds then
reconf igure the terminal address
(Conf er DC addressing procedure)
Press on the three right-hand side's buttons at
the same time during a f ew seconds then
reconf igure display address setting at 32.
Check the instructions f rom 3811 to 3833 and
reconf igure options if necessary.
Disconnect the DS50 f rom the unit and then
reconnect it.
Disconnect then re-plug; disconnect each unit
from the others then change all the pLAN
addresses
Page 93