Commissioning
Preparing with the power off
About this task:
CAUTION
Ensure only authorized personnel perform commissioning of this unit.
WARNING
Complete the following checks with the customer supply to the unit switched OFF.
Inspection: Inspect the unit for installation damage. If found take action or repair as appropriate.
Inspect the wiring and ensure connection terminals are correctly tightened.
Refrigerant charge: Units are normally shipped as standard with a full refrigerant operating
charge. Check that refrigerant pressure is present in both systems and that there are no leaks. If
there is no pressure in the system, complete a leak test, locate the leak, and repair the problem.
Evacuate any repaired systems with a suitable vacuum pump or recovery unit as appropriate to
below 1,000 microns before charging.
CAUTION
Do not charge liquid refrigerant with static water in the heat exchanger. Care must also be taken to
charge liquid refrigerant slowly to avoid excessive thermal stress at the charging point.
After the vacuum is broken, charge with the full operating charge. See Refrigerant and oil charge.
Valves: Ensure that the compressor discharge and suction service valves are set correctly, that is
they are open.
Fans: Check that all fans are free to rotate and are not damaged. Ensure blades are at the same
height when rotated. Ensure the fan guard is securely fixed.
Isolation/protection: Verify that all sources of electrical supply are taken from a point of isolation.
Power panel: Check the panel to see that it is free of foreign materials, for example wire or metal
chips, and clean out if required. Vacuum clean only. Do not pressure clean.
Power connections: Check the customer power cables are connected correctly. Ensure that
connections of power cables within the power panel to the circuit breaker are tight. See Table 8.
Earthing: Verify that the unit earth terminal is correctly connected to a suitable earthing point.
Ensure that all unit internal earth connections are tight.
Supply voltage: Verify that the site voltage supply corresponds to the unit requirements and is
within the limits given in Electrical data. The phase imbalance must be less than 2% of the average
voltage.
YMAE Air-Cooled Inverter Scroll Chiller and Heat Pump72
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