Installation Instructions - Nidec EMBRACO SLIDING UNIT Serie Montageanleitung

• Ensure the Unit is earthed when replacing components
• For Units with a 3-phase compressors, 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 according wiring diagram.
For scroll compressors Units verification of proper rotation can be made by observing that the suction pressure drops
and the discharge pressure rises when the compressor is energized. Additionally, if operated in reverse the
compressor is noisier and its current draw is substantially reduced compared to tabulated values.
If this is the case, you must reverse 2 phases and check the correct operation of the compressor.
3.9 Connecting replacement 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 pressurize 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 28 bar.
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 Unit to vacuum the system.
Never use ohmmeter 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 Unit 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.
Ensure liquid charge by checking the sight glass.
Charge 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.

INSTALLATION INSTRUCTIONS

Complete the "pre-start check list" before switching on the installation.
Pre-start check list
1. The power supply is compatible with power supply indicated on the Unit label.
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 valves are fully open.
6. The crankcase heater is working (must be energized minimum 4-6 hours for reciprocating compressors and
minimum 12 hours for scroll compressors Units).
7. Fan blades rotate freely and in proper rotation direction (sucking air from condenser towards compressor).
8. Safety pressure switches are set properly for LP and HP according to the refrigerant used and application envelop.
9. Fan speed controller has 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.
Check list after start-up
After the installation has been running for several hours, carry out the following checks:
1. The power supply voltage and current consumption by the Unit is correct.
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