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Warning:
To ensure the quality of EMBRACO condensing unit it is essential to:
• Check that the installation power supply voltage is compatible with the voltage supply of the condensing unit (refer
to identification label).
• Check the compatibility of the wiring diagram that of the installation (refer to picture 4)
• Size the cables (power and control) according to the specifications of the condensing unit installed
• Ensure the power supply to the unit is correctly protected and earthed
• Ensure the unit is earthed when replacing components
For units with a 3-phase scroll, correct phase sequence for rotation direction must be observed.
• Determine the phase sequence by using a phase meter in order to establish the phase orders of line phases
L1,L2,L3
• Connect line phases, L1, L2, L3 to main switch terminals T1,T2,T3 respectively
3.8 Connecting components.
Please refer to the wiring diagram supplied with the unit when connecting
components. For details follow manufacturers’ datasheet of components you are replacing.
4. START UP
4.1 Leak detection
•
Never pressurized the circuit with oxygen or dry air. This could cause fire or explosion.
• Perform a first leak detection in over pressure with nitrogen gas maximum test pressure is 28bars.
• All connections must be systematically checked for any leakage with an electronic leak detector for the type of
refrigerant used around the joints
• When a leak is discovered, repair the leak and repeat the leak detection.
4.2 Vacuum dehydration
•
Never use the compressor to vacuum the system.
• Never use a megohmmeter nor apply power to the compressor while it is under vacuum. It may cause internal
damage.
• Pull a deep vacuum of the installation to about 0.14mbar absolute.
• Use the suitable vacuum pump (double stage is recommended).
• Vacuum the system simultaneously from both LP and HP pressure sides.
4.3 Refrigerant charge
•
Never start the compressor under vacuum.
• Charge the installation using only refrigerant for which the unit has been designed for.
• Charging with refrigerant should always take place in the liquid phase in order to maintain the correct blend of
zeotropic refrigerant.
• Only liquid charge into liquid line.
• Charging the system to 4-5 bar when using R404A or equivalent and approximately 2 bars for R134a or equivalent.
• The remaining refrigerant can be slowly charged into the suction line when the compressor is running, until the
nominal operating conditions of the installation are reached.
Complete the “pre-start check list” before switching on the installation.
INSTALLATION INSTRUCTIONS
Pre-start check list
1. The power supply voltage is compatible with that of the condensing unit
2. If oil sight glass is present, observe the oil level at the start.
3. Electrical safety devices are set correctly.
4. Electrical connections are properly fastened.
5. Service valve are fully open
6. The crankcase heater is working (must be energized minimum 12 hours before the compressor starts)
7. Condensing fan blades rotate freely.
8. Safety pressure switch are set properly for LP and HP according to the refrigerant used and application envelop.
9. Fan speed controller have been set properly. Supplied units have fan speed set according the manufacturer´s set
up point.
10. The installation is given a final check for any possible faults.
