Lennox ROOFTOP FLEXY FXK 55, Installation, Operating And Maintenance Manual

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MAINTENANCE PLAN
FLEXYII_WSHP-IOM-1307-E - 78 -
Task Operating mode
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Clean or replace filters :
disposable or metal frame
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.
O 20
Visual check of the oil level
Visually check the oil level through the sight glass on the
side of the compressor casing
O 2
Position check of the
compressor crankcase heater Check the heating resistance is fitted properly and tight
around the compressor body
O 2
Belt tension check
Check belt tension (information on installation manual).
Replace belt if necessary.
O 10
Centrifugal fan bearings check
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.
O 10
Check absorbed amps
Check absorbed amps on all the three phases. Compare
with the nominal value given in the electrical wiring
diagram.
[] 15
Check smoke detector
Start the unit. Trigger the smoke detector by moving a
magnet around the detector head.
Reset unit and control
[] 5
Check CLIMATIC control, set-
points and variables Refer to the commissioning sheet. Check all set points
are set according to this document.
[] 15
Check clock settings Check the time and date of the control O 5
Check the position and tightness
of refrigeration components
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.
[] 30
Check airflow rate safety switch
(if fitted) Shut down supply fan. The fault must be detected within
5 seconds.
O
Check freeze protection on hot
water coil
[] 5
Check three way valve on hot
water coil
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
[] 5
Check economizer actuator
operation
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.
[] 5
Check refrigeration 4 way valve
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.
[] 5
Check tightness of all electrical
connections
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.
O 30