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17 Control logic for the
compensation set-point
THE ANR UNITS HAVE AN OUTSIDE AIR TEMPERATURE
COMPENSATION FUNCTION.
THIS OPTION MODIFIES THE SETPOINT TO WORK ON THE
BASIS OF THE OUTSIDE AIR.
TEMPERATURE ACTING ON SOME SETPOINTS SET IN THE
UNIT.
During cooling function, the work set is calculated automatically,
the logic by which this calculation happens is the following:
One sets the minimum value (Cooling set 2) and the maxi-
mum (Cooling set 1) at which you want the machine to work
One sets the external temperature at which one wants the
unit to reach in regards to the maximum set (TAE 1) and the
minimum set (TAE 2)
In this way, the unit is able to measure the temperature of the ex-
ternal air, and on the basis of this, decide which value to give to
the cooling work set.
During „heating" operation, the work set is calculated automati-
cally, the logic by which this calculation happens is as follows:
Set a minimum value (Heating set 2) and a maximum (Heat-
ing set 1) at which you want to have the machine work
Set an external temperature at which you want the unit to
reach, respectively, the maximum set (TAE 1) and the mini-
mum set (TAE 2)
In this way, the unit is able to measure the temperature of the ex-
ternal air, and on the basis of this, decide which value to give to
the heating work set.
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18 Maintenance
NOTE
All routine and extraordinary maintenance operations must be carried out
exclusively by qualified staff.Before starting any servicing operation or
cleaning, be sure to disconnect the power supply to the unit.
All appliances are subject to inevitable wear and tear over time.
Maintenance makes it possible to.Maintain the efficiency of the
unit
Reduce the speed of deterioration.
Gather information and data and understand the condition of
efficiency of the unit in order to prevent breakdowns.
It is therefore essential to carry out periodic controls:
YEARLY
SPECIAL CASES
Keep a maintenance log on the machine (not supplied with the
unit, the user must provide for one) that enables you to keep
track of the servicing carried out on the unit. This makes it easy
to organise the work appropriately and facilitates troubleshooting
on the machine.In the log, record the date, type of work carried
out (routine maintenance, inspection, or repair), a description of
the work, any measures taken, and so on...
Yearly check
Cooling circuit
Verify the watertightness of the cooling circuit, and that the
pipes have not been damaged.
Perform an acidity test on the cooling circuit oil.
Verify the operation of the high and low pressure pressure
switches; in the event of poor operation, replace the
switches
Check the state of deposits on the dehydrator filter; if in-
crusted, replace the filter.
Electrical checks
Check the condition of the electrical wires and their insula-
tion.
Verify the operation of the resistance of the evaporator and,
if present, of the compressor sump.
Mechanical checks
Check the tightness of the screws on the fan grilles and on
the fan bodies, the compressors and the electrical box, as
well as the exterior panelling of the unit. Insufficient fasten-
ing can lead to undesired noise and vibrations
Check the condition of the structure. If there are any oxi-
dised parts, treat with paint suitable to eliminate or reduce
oxidation.
Hydraulic controls
Clean the water filter.
Bleed the air from the circuit.
Verify that the water flow rate to the evaporator is constant.
Verify the thermal insulation of the hydraulic piping.
Check the percentage of glycol where necessary.
18
EN-19
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