10 - OPERATION
10.1 - First commissioning
■ Read the guides for commissioning any accessories very carefully and follow all advice.
■ Check that the supply voltage corresponds to that given on the data plate.
■ Retighten the connections of the electrics box.
■ Switch the unit on and check that all the fans are turning in the correct direction (direction of rotation shown on the labels).
In the event of abnormal noise coming from the fan motor assemblies, immediately switch off the power supply and contact us.
■ Ensure that the hydraulic circuit(s) are clean.
■ Start charging by bleeding the air remaining in the circuit using the vents provided in the top section.
■ Start increasing the pressure, then check that the pipe connections are fully sealed.
10.2 - In the event of faults
Please contact us if you require any help. Before contacting your CIAT agency, please check the following points:
- Are all fans turning in the correct direction? (check this against the labels)
- Is the supply voltage correct?
- Are the motors running at the correct speed? (check the input current)
- Has the uid direction been reversed during connection of the coil?
- Are the ns of the coil clogged?
- Are there any issues relating to air recycling or a poor air supply?
10.3 - Recommendations for use
Scaling and corrosion have a very negative effect on the operation and service life of the units. Therefore, only use treated
water or authorised fluids (check the compatibility of any additives with the drycooler's materials).
11 - AC FAN MOTOR ASSEMBLIES
11.1 - AC motor protection
■ All the motors are equipped with a thermal cut-out, which is available in the motor terminal box. Wiring for the thermal cut-out is
optional
11.2 - Fan with AC motor (3-ph 230 V/400 V 50 Hz)
■ On a 3-ph/400 V/50 Hz network, the motors have 2 rotation speeds, via star (Y) or delta connection (Δ).
- Low speed with Y connection
- High speed with Δ connection
■ On a 3-ph/230 V/50 Hz electrical network, the motors have 1 rotation speed via delta connection (Δ):
- Low speed with Δ connection
11.3 - Fan with AC motor 3-ph 208 V and 3-ph/400 V to 480 V 60 Hz
■ On a 3-ph 208 V/60 Hz and 230 V/50 Hz electrical network, the motors have 1 rotation speed via delta connection (Δ).
■ On a 3-ph/400 to 480 V/60 Hz electrical network, the motors have 1 rotation speed via star connection (Y):
Impeller diameter mm 910 800
Motor type B9A B9B B9C B8A B8B B8C B8D
3-ph 208 V/60 Hz supply Δ Δ Δ - - Δ Δ
3-ph/400 to 480 V/60 Hz supply Y Y Y Y Y Y Y
Speed(s) rpm 1100 1000 800 1100 1050 840 520
Weight of impeller + motor kg 28 25 25 23 23 19 19
Weight of fan motor assembly kg 69 66 66 51 51 47 47
Min. room temperature for storage °C -40
Min. operating temperature °C -40
Insulation class F
Sealing class IP 54
Number of starts Max. 50 / hour
11
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