La Marzocco kb90 Series, Руководство пользователя

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8. Mandatory Maintenance and Check-up Operations
These operations are in addition to the Maintenance and Periodic Cleaning Operations as specified in Chapter 6.
The following maintenance and check-up operations sould be carried out by a qualified technician.
The time required for the periodic maintenance is determinated by the quantity of daily work and/or coffee consumption.
N.B. These periodic maintenance operations are not covered by warranty.
EVERY THREE/FOUR MONTHS
EVERY SIX/EIGHT MONTHS (in addition to the above)
EVERY YEAR (in addition to the above)
▪ Replace group gaskets
▪ Replace diffuser screens
▪ Clean auto-fill probe
▪ Check vacuum breaker for
proper operation
▪ Inspect water inlet valve
▪ Inspect drain system for leaks
or clogs
▪ Check flow rate for each group
▪ Check brew temperature
▪ Check that brew pressure is
at 9bar
▪ Check all switches for proper
operation
▪ Check/note water hardness
▪ (Water quality must be within
the range of parameters
specified in the chapter
on Installation, otherwise
warranty is voided)
▪ Check filter basket condition
▪ Check shot volumes
▪ Test flowmeter’s ohm value
(ohm value is acceptable if
greater than 1.8 K ohm, and
less than 2.2 K ohm
▪ Rebuild steam assemblies
▪ Check the condition of the inside of boilers and if necessary rinse out with a proper cleaning product allowed for food and beverage
appliances.
EVERY 3 YEARS (in addition to the above)
▪ Replace portafilter baskets
▪ Inspect group valve plungers
▪ Inspect vacuum breaker
▪ Inspect contactor
▪
Inspect expansion valve
▪ Inspect electrical wiring
condition
▪ Inspect boilers safety switches
▪ Replace over-pressure valve
(safety valve)
▪
Accurate control of the
tightness at 2,4Nm of
each cable on the terminal
block.