Lennox BAH075DNM User Manual

MAINTENANCE PLAN
BALTIC R410A-IOM-0708-E Page 123
Task Operating mode
Monthly Quarterly 6 monthly Yearly B4 winter Estimated Time (min)
Check outdoor fans and fan guards
Check the fan blades conditions and all fan
guards and protections
o 5
Check position of all sensors
Check the good positioning and operation of all
sensors of all sensors. Check the values given in
the control system. Replace sensor if necessary
o 5
Check and clean if necessary all
fresh air grilles
Check the fresh air grilles (if fitted). If dirty or
damaged, remove them from unit and clean with
high pressure water cleaner. Refit on unit once
clean and dry.
o 5
Clean condensate drain, indoor and
outdoor coils (following local
regulations)
Visually check the coils for dirt. If not too dirty,
cleaning with a light brush may be enough
(WARNING: Fins and copper tubes are very
fragile! Any damage WILL reduce the
performances of the unit). If very dirty, deep
industrial cleaning is required using de-greasing
agents.(External contractors must be called).
o /
[]
1h if
clea
ning
Check electric heater element for
excessive corrosion
Isolate the unit; Pull the electric heater out of the
heater module box and check the resistances of
traces of corrosion; Replace resistance as
required;
o
1h if
repl
ace
men
t
Check anti-vibration mountings, for
wear and tear.
Visually check anti-vibration mountings on
compressors and centrifugal fan. Replace if
damaged.
o
1h if
repl
ace
men
t
Check refrigeration circuit for traces
of acid in the oil
Take a sample of oil from the refrigeration
circuit.
[]
Check Glycol concentration in the
HWC circuit
Check the glycol concentration in the
pressurised water circuit. ( a concentration of
30% gives a protection down to aprox. -15°C)
check the circuit pressure
[] 30
Check defrost cycle with 4-way valve
inversion.
Switch the unit to heat pump mode. Change the
set point to obtain the standard defrost mode
and reduce the cycle time to the min value.
Check the operation of the defrost cycle.
[] 30
Gas burner module check for
corrosion
Pull out the burner to access the tubes (refer to
Gas burner section in the IOM)
[] 30
Sweeping and cleaning the gas
burner
Clean the in-shot burners and the blower wheel
lightly with a brush. Sweep the flue and flue box.
Wipe-off the dust from the housing of the motor.
Clean combustion air inlet louvers Pull-out
baffles from the tubes, sweep the tubes
CHECK FLUE BOX GASKET
[] 30
Gas supply pressures / connections
checks
refer to Gas burner section in the IOM for details [] 15
Gas regulation valve settings refer to Gas burner section in the IOM for details [] 30
Check gas burner safety switches refer to Gas burner section in the IOM for details [] 30

Lennox BAH075DNM Specifications

General

Brand	Lennox
Model	BAH075DNM
Category	Air Conditioner
Language	English