Lennox BAC 030 SNM 3M Installation, Operating And Maintenance Manual page 74

MAINTENANCE PLAN
Task Operating mode
Increase room set-point 10°C above the
Check three way actual room temperature. Check operation
valve on HWC of the piston. It must move away from the
valve head. Reset the control.
Check all fi xings and transmission. Stop
Check economiser the unit using the control. The fresh air
actuator operation damper must close. Start the unit the
fresh air damper should open
With the unit running in cooling mode
Check refrigeration increase the room set-point temperature
4way valve 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 electric
Check tightness of all
connections, taking a particular attention
electrical connections
to the power lines and low voltage control
wires
Install manifold gauges on the circuit to
be checked. Shut down the axial fans and
wait for the HP switch to shut down the
Check HP / LP safety compressor: 29 bar (+1 / -0) auto-reset
switches 22 bar (+ - 0,7) Reconnect fans. Switch off
the centrifugal supply fan and wait for the
LP switch to cut out: 0.5bar (+ - 0,5) reset
1,5bar (+-0,5).
Check HP analogic Install calibrated manifold gauges on the
sensor calibration circuit to be checked.
Check outdoor fans Check the fan blades conditions and all
and fan guards fan guards and protections
Check the good positioning and operation
Check position of all of all sensors of all sensors. Check
sensors the values given in the control system.
Replace sensor if necessary
Check the fresh air grilles (if fi tted). If dirty
Check and clean if
or damaged, remove them from unit and
necessary all fresh air
clean with high pressure water cleaner.
grilles
Refi t on unit once clean and dry.
Visually check the coils for dirt. If not too
dirty, cleaning with a light brush may be
Clean condensate
enough (WARNING: Fins and copper
drain, indoor and
tubes are very fragile! Any damage WILL
outdoor coils
reduce the performances of the unit).
(following local
If very dirty, deep industrial cleaning
regulations)
is required using de-greasing agents.
(External contractors must be called).
• 70 •
Monthly Quarterly
Yearly
6 monthly before
winter
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BALTIC-IOM-0412-E / Service manual
Estimated
time
(min)
5
5
5
30
15
30
5
5
5
1h if cleaning