Start-Up And Shutdown - Daikin WGZ030DW Operating And Maintenance Manual

Start-Up and Shutdown

Pre Start-up
1. The chilled-water system should be flushed and cleaned. Proper water treatment is required to
prevent corrosion and organic growth.
2. With main disconnect open, check all electrical connections in control panel and starter to be sure
they are tight and provide good electrical contact. Although connections are tightened at the factory,
they can loosen enough in shipment to cause a malfunction.
3. Check and inspect all water piping. Make sure flow direction is correct and piping is made to correct
connection on evaporator and condenser.
4. Open all water flow valves to the condenser and evaporator.
5. Flush the cooling tower and system piping to be sure the system is clean. Start evaporator pump and
manually start condenser pump and cooling tower. Check all piping for leaks. Vent the air from the
evaporator and condenser water circuit, as well as from the entire water system. The cooler circuit
should contain clean, treated, non-corrosive water.
6. Check to see that the evaporator water thermostat sensor is securely installed.
7. Making sure control stop switch S1 is open (off) and pumpdown switches PS1 and PS2 are on
"manual pumpdown," place the main power and control disconnect switches to "on." This will
energize the crankcase heaters. Wait a minimum of 12 hours before starting the unit.
8. Check compressor oil level. Prior to start-up, the oil level should cover at least one-third of the oil
sight glass located in the equalizing line between the compressors or on the compressor.
9. Note the water pressure drop across evaporator and condenser on pages 4 and 5 and check that water
flow is correct per the system design flow rates.
10. Check the actual line voltage to the unit to make sure it is the same as called for on the compressor
nameplate, within + 10%, and that phase voltage unbalance does not exceed 3%. Verify that adequate
power supply and capacity is available to handle load.
11. Make sure all wiring and fuses are of the proper size. Also make sure that all interlock wiring is
completed per Daikin Applied diagrams.
12. Verify that all mechanical and electrical inspections by code authorities have been completed.
13. Make sure all auxiliary load and control equipment is operative and that an adequate cooling load is
available for initial start-up.
Start-up
1. Open the compressor discharge shutoff valves until backseated. Always replace valve seal caps.
2. Open the two manual liquid line shutoff valves.
3. Check to see that the unit circuit breakers are in the "off" position.
4. Check to see that the pumpdown switches, PS1 and PS2, are in the "manual pumpdown" position and
the control system switch S1 is in the "off" position.
5. Put the main power and control circuit disconnects to the "on" position.
6. Verify crankcase heaters have operated for at least 12 hours prior to start-up. Crankcase should be
warm to the touch.
7. Check that the MicroTech II controller is set to the desired chilled water temperature.
8. Start the system auxiliary equipment for the installation by turning on the time clock, ambient
thermostat and/or remote on/off switch and water pumps.
9. Check resets of all equipment protection controls.
10. Switch on the unit circuit breakers.
11. Set pumpdown switches PS1 and PS2 to "auto" for restart and normal operation.
OMM 1130-2 11