26
START UP
Start up
The following operations must be carried out only by properly trained personnel. To make the
contractual warranty
effective, start
up
must be carried out by authorized service centres
.
Before calling the service centre it is advisable to make sure that all the installation steps have been completed (positioning, electrical
connections, hydraulic connections...).
Preliminary checks before turning on
1. Verify that :
- the unit has not suffered visible damages due to transport or positioning
- the unit is placed on an horizontal surface able to bear its weight
- the minimum operating area are respected
- the ambient conditions comply with the provided operating limits
- the hydraulic and electrical connections has been carried out correctly
2. Disconnect the unit power suply line at the start and make sure that :
- the unit power supply line complies with the regulations in force
- the screws, fastening the electrical cables to the components inside the electrical panel of the unit, are well tightened (vibrations
during transport phases could have caused some loosening)
3. Connect the unit power supply line and verify that :
- the voltage of the power supply line complies with the the nominal one of the unit
- for three phase power supply units, the unbalance between the phases is lower than 2% (a higher value produces an excesive
current input on one or more phases causing possible damages to the electrical components of the unit)
NOTE
.
Example of phase unbalance calculation
- Read the value of the three line voltages using a voltmeter :
line voltage between phases L
1
and L
2
:
V
1-2
= 390 V
line voltage between phases L
2
and L
3
:
V
2-3
= 397 V
line voltage between phases L
3
and L
1
:
V
3-1
= 395 V
- Calculate the difference between the maximum and minimum value of the measured line voltages :
ΔV
max
= max ( V
1-2
; V
2-3
; V
3-1
) - min ( V
1-2
; V
2-3
; V
3-1
) = V
2-3
- V
1-2
= 397 - 390 = 7 V
- Calculate the average line voltage value :
Δ
average
= ( V
1-2
+ V
2-3
+ V
3-1
) / 3 = ( 390 + 397 + 395 ) / 3 = 394 V
- Calculate the percentage unbalance value :
ΔV
max
/ V
average
x 100 = 7 / 394 x 100 = 1,78 % < 2 %
Turning on
Start all the plant components necessary to guarantee an adequate water flow rate on the plant and source side hydraulic circuit.
Activate the unit in heating or in cooling mode operating on the user interface or on the remote controls and insert a set point suitable
to require the unit to work.
