8 MAINTENANCE
Correct maintenance prevents problems, guarantees maximum operating efficiency of
the appliance and allows running costs to be contained.
The maintenance operations described in this paragraph must be performed exclusively
by the serviceman in charge of the plant or by the Technical Assistance.
Any operation that regards internal components of units of the appliance must be
carried out by the Technical Assistance, according to the instructions supplied by the
manufacturer.
The "efficiency check" and every other "check and maintenance operation" (see Table
8.1 → 62 and 8.2 → 63), must be performed with a frequency in agreement to cur-
rent law or, if more restrictive, in respect of what requested by the planner (builder of the
system) or by the manufacturer of the unit.
The liability of CHECKING THE EFFICIENCY AS A FUNCTION OF THE SYSTEM, OF THE FUEL
IN USE AND OF THE THERMAL POWER, to be carried out with the purpose of containing
the energy consumption, is in charge to the responsable of the system.
Before any maintenance operation, switch off the appliance through controls and wait
for the completion of the shut-down cycle. When the appliance is off, switch off power
supply and gas supply (according to anti-icing settings), opening the electrical breaker
and closing the gas isolation valve.
GUIDELINES FOR THE PREVENTIVE MAINTENACE OPERATIONS
In Table 8.1 → 62 are reported the guidelines for the preventive maintenance
operations.
If the unit is subject to particularly heavy duty (for example in process plants or in
other conditions of continuous operation), these maintenance operations must be
more frequent.
Table 8.1
GUIDELINES FOR THE PREVENTIVE MAINTENACE OPERATIONS
Check of the unit GAHP-A GAHP-GS/WS AY ACF GAHP-AR
Visually check of the general condition of the unit and of its air heat exchanger. (1) √ √ √ √ √
Check the correct operation of the device used for monitoring the water flow √ √ √ √ √
Check the % value of CO2√ √ √
check gas pressure to the burners √ √
Check that the condensate discharge is clean
[If necessary, frequency of the maintenace operation must be increased] √ √ √
Replace the belts after 6 years or 12,000 hours of operation √ √ √ √
Check/restore the pressure of the primary hydronic circuit √
Check/restore the air pressure inside of the expansion vessel of the primary hydronic circuit √
1 It is suggested the cleaning of the air heat exchanger once every 4 years [the optimal frequency of this operation is in any case a consequence of the installation site].
ORDINARY SCHEDULED MAINTENANCE
Perform the following operations at least once every 2 years.
