Lennox FCM 85 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 airflow rate or a high pressure drop before
Water found in the
ventilation section
Water ingress in the Water ingress through a leaking fresh air hood or
filter 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
FLEXYII-IOM-0409-E
POSSIBLE CAUSE AND SYMPTOMS
Low airflow rate
Incorrect position of the Klixon
POSSIBLE CAUSE AND SYMPTOMS
Cooling mode:
Water carried away from the coil because of
excessive airflow and speed on the coil.
the fan
Check seals around the ventilation section.
when running 100% fresh air
POSSIBLE CAUSE AND SYMPTOMS
Problem of addressing pLAN on the DC50
Idem
Possible problem of units' configuration
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 airflow,
relocate Klixon if necessary
Check that there is no heat transfer from the
Klixon support.
SOLUTION
Estimate the airflow rate and check the speed is
lower than 2.8 m/s
Check filter
Reduce airflow rate
Check the door seal
Check for the presence of silicone seals in the
corners of the door and at the bottom of the
refrigeration section bulkhead.
Check the seals and flanges in the fresh air hood
Reduce the airflow rate if necessary
SOLUTION
Press on the three right-hand side's buttons at
the same time during a few seconds then
reconfigure the terminal address
(Confer DC addressing procedure)
Press on the three right-hand side's buttons at
the same time during a few seconds then
reconfigure display address setting at 32.
Check the instructions from 3811 to 3833 and
reconfigure options if necessary.
Disconnect the DS50 from the unit and then
reconnect it.
Disconnect then re-plug; disconnect each unit
from the others then change all the pLAN
addresses
Page 94