Pre-Startup Checks - Daikin EWYD-BZ Series Installation, Maintenance & Operation Manual

Pre-startup checks

General
Once the machine has been installed, use the following procedure to check that is has been done properly:
Before servicing the machine in any way, open the general disconnect switch on the machine main power supply.
When the machine is off but the disconnect switch is in the closed position, unused circuits are live, as well.
Never open the terminal board box of the compressors before having opened the unit's general disconnecting switch.
After switching off the unit, the intermediate circuit capacitors are still charged with high voltage for a short period of
time. Capacitor full discharge takes approximately 5 minutes. Wait for the LEDs on the inverter to turn off before
attempting to access parts which could potentially be live. Please consult the inverter manual for further details.
Inspect all the electrical connections to the power circuits and to the compressors including the contactors, fuse carriers
and electrical terminals and check that they are clean and well secured. Even though these checks are carried out at the
factory on every machine that is shipped, vibrations during transportation may loosen some electrical connections.
Check that the electrical terminals of cables are well tightened. A loose cable can overheat and give rise to problems
with the compressors.
Open discharge, liquid, liquid injection and suction (if installed) valves.
Do not start up the compressors if the delivery, liquid, liquid injection or suction valves are closed. Failure to open these
valves may cause serious damage to the compressor.
Put all the fan circuit breakers (from F16 through F20 and from F26 through F30) on the On position.
If the the fan circuit breakers are forgotten open, both compressors will trip due to high pressure (chiller mode) or low
pressure (heat pump mode) when the machine is started up for the first time. Resetting the high-pressure alarm requires
opening the compressor compartment and resetting the mechanical high-pressure switch.
Check the power supply voltage at the general door-handle switch terminals. The power supply voltage must be the
same as that on the nameplate. Maximum allowed tolerance  10%.
Voltage unbalance between the three phases must not exceed  3%.
The unit comes with a factory-supplied phase monitor that prevents compressors and fans from starting in the event of
wrong phase sequence. Properly connect the electrical terminals to the disconnector switch so as to ensure alarm-free
operation. If the phase monitor triggers an alarm once the machine has been powered, just invert two phases at the
general disconnector switch supply (unit power supply). Never reverse the electrical wiring on the motor.
Fill the water circuit and remove air from the system's highest point and open the air valve above the evaporator shell.
Remember to close it again after filling. The design pressure on the water side of the evaporator is 10.0 bar. Never
exceed this pressure at any time during the life of the machine.
CAUTION
CAUTION
CAUTION
ATTENTION
IMPORTANT
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