Lennox FCM 85 Installation, Operating And Maintenance Manual page 80

MAINTENANCE PLAN
Task
Clean or replace filters :
disposable or metal frame
Visual check of the oil level
Position check of the
compressor crankcase heater
Belt tension check
Centrifugal fan bearings check
Check absorbed amps
Check smoke detector
Check CLIMATIC control, set-
points and variables
Check clock settings
Check the position and tightness
of refrigeration components
Check airflow rate safety switch
(if fitted)
Check freeze protection on hot
water coil
Check three way valve on hot
water coil
Check economizer actuator
operation
Check refrigeration 4 way valve
Check tightness of all electrical
connections
FLEXYII_WSHP-IOM-1307-E
Operating mode
Replace filters with new ones if disposable. Vacuum
clean or blow the dirt. Wash and dry carefully.
Replace media if necessary.
Blocked filter will reduce the performance of the unit.
THE UNIT MUST NOT OPERATE WITHOUT FILTERS.
Visually check the oil level through the sight glass on the
side of the compressor casing
Check the heating resistance is fitted properly and tight
around the compressor body
Check belt tension (information on installation manual).
Replace belt if necessary.
Isolate unit from the main power supply.
Push the fan wheel manually and check for abnormal
noises.
Bearings are lubricated for life but may need replacement
after 10000 hours.
Check absorbed amps on all the three phases. Compare
with the nominal value given in the electrical wiring
diagram.
Start the unit. Trigger the smoke detector by moving a
magnet around the detector head.
Reset unit and control
Refer to the commissioning sheet. Check all set points
are set according to this document.
Check the time and date of the control
Check systematically all connections and fixings on the
refrigeration circuit.
Check for oil traces, eventually a leak test should be
conducted.
Check operating pressures correspond to the ones
indicated on the commissioning sheet.
Shut down supply fan. The fault must be detected within
5 seconds.
Increase room set-point 10°C above the actual room
temperature. Check operation of the piston. It must move
away from the valve head.
Reset the control
Check all fixings and transmission.
Stop the unit using the control. The fresh air damper must
close. Start the unit. The fresh air damper should open.
With the unit running in cooling mode, increase the room
set-point temperature by 10 °C.
The unit should switch to heat pump mode.
Reset the control.
Power down the unit and check and tighten all screws,
terminal and electrical connections, taking a particular
attention to the power lines and low voltage control wires.
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