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power circuit: 400V/3/50Hz + Earth
control circuit: 230V/1/50Hz (pressure switches – crankcase heaters).
Cabling is determined according to:
- Maximum nominal intensity
- The distance between the unit and its power source.
- The protection at the source
Electrical
motor wiring
Electrical motors for compressors
These are designed for a direct start.
The compressor motors must be fitted with an anti-short cycle mechanism allowing a maximum of 6 start-ups per hour.
Always refer to the instructions shown on the compressor
Important
: the maximum imbalance between phases is 2% in voltage and 10% in current per motor.
Electronic module protection
The 7.5HP to 15HP power models have an electronic winding motor temperature protection (identified by a W in the motor
reference, e.g. ZF33K4E-TWD ).
These are equipped with module INT 69SCY as a standard feature.
These modules detect the following problems:
-Rotor blocked, cut-out temperature 80°C
-Motor overheating, cut-out temperature 140°C
-Discharge temperature too high
In all cases, the compressor restart time delay is 30 minutes after the disappearance of the fault.
Internal thermostat protection
The other models than those mentioned above have an internal motor overheating protection (internal Klixon), which stops the
motor in the event of the winding temperature being too high, independently of the control.
For ZF models up to ZF18, a mini intensity relay (INT 125 type 35) is added in order to detect the cutting out of the compressor
to serve the injection of liquid during compressor shut down.
Electrical motors of condenser
Models equipped with 355, and 450 diameter fan-motors (plastic fans)
The motors fitted in the condenser are triple phase.
These must be coupled in STAR formation at 400V
When using an old 230V circuit, the motors should be connected in delta formation.
Motor applications:
- Ambient temperature -40°C to +50°C
- Hygrometry from 60 to 98 % with purging holes
- Insulation class F
- Protection factor IP 55 (purging holes blocked)
- Nominal current 380V to 420V
The motor protections must conform to legal standards and calibrated to the nominal current.
Other models 500 mm diameter:
The condenser is fitted with three-phase high-resistant motors
These are to be connected in TRIANGLE formation at 400 V
When used on old 230V circuits, the standard motors will not run at high speed, even on a Delta connection. These motors must be
changed, otherwise the condensing pressure will be too high.
Operating Conditions of Motors:
-
Ambient Temperature - 40° C to +50°C
-
Humidity of 60% to 98% with purge holes
-
Class F
-
Protection Factor IP 54 (purge holes sealed)
-
Operating Voltage of 380V to 420V
-
The motor protection factor must conform to the standards in force and be adjusted according to the maximum voltage at high
speed.
Important:
With regard to power supply, the maximum imbalance between phases is 2% in voltage and 10% in current per motor.
ADDITIONAL SAFETY CONTROLS
Safety Features
The safety switches fitted to the compressors must cut off the compressor instantaneously.
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