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

Start-Up and Shutdown

Start-Up and Shutdown
Complete operating instructions are contained in the current
version of Operating & Maintenance Manual found on
www.DaikinApplied.com.
Pre Start-up
The chilled-water system should be flushed and cleaned.
1
Proper water treatment is required to prevent corrosion
and organic growth.
With main disconnect open, check all electrical
2
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.
Check and inspect all water piping. Make sure flow
3
direction is correct and piping is made to correct
connection on evaporator and condenser.
Open all water flow valves to the condenser and
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evaporator.
Flush the cooling tower and system piping to be sure the
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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.
Check to see that the evaporator water thermostat sensor
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is securely installed.
Making sure control stop switch S1 is open (off) and
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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.
Check compressor oil level. Prior to start-up, the oil level
8
should cover at least one-third of the oil sight glass
located in the equalizing line between the compressors or
on the compressor.
Check water pressure drop across evaporator and
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condenser, and see that water flow is correct (beginning
on page 17) per the design flow rates.
Check the actual line voltage to the unit to make sure it is
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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.
Make sure all wiring and fuses are of the proper size.
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Also make sure that all interlock wiring is completed per
Daikin Applied diagrams.
Verify that all mechanical and electrical inspections by
12
code authorities have been completed.
IM 1131-2
Start-Up and Shutdown
Make sure all auxiliary load and control equipment is
13
operative and that an adequate cooling load is available
for initial start-up.
Start-up
Open the compressor discharge shutoff valves until
1
backseated. Always replace valve seal caps.
Open the two manual liquid line shutoff valves.
2
Check to see that the unit circuit breakers are in the "off"
3
position.
Check to see that the pumpdown switches, PS1 and PS2,
4
are in the "manual pumpdown" position and the control
system switch S1 is in the "off" position.
Put the main power and control circuit disconnects to the
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"on" position.
Verify crankcase heaters have operated for at least 12
6
hours prior to start-up. Crankcase should be warm to the
touch.
Check that the MicroTech II controller is set to the
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desired chilled water temperature.
Start the system auxiliary equipment for the installation
8
by turning on the time clock, ambient thermostat and/or
remote on/off switch and water pumps.
Check resets of all equipment protection controls.
9
Switch on the unit circuit breakers.
10
Set pumpdown switches PS1 and PS2 to "auto" for
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restart and normal operation.
Start the system by setting the system switch S1 to on.
12
After running the unit for a short time, check the oil level
13
in each compressor crankcase, rotation of condenser fans
(if any), and check for flashing in the refrigerant sight
glass.
After system performance has stabilized, it is necessary
14
that the "Compressorized Equipment Warranty Form"
(Form # SF-990007) be completed to establish
commencement of the warranty period. Be sure to list the
pressure drop across both vessels. This form is shipped
with the unit and after completion should be returned to
the Daikin Applied service through your sales
representative.
Weekend or Temporary Shutdown
Move pumpdown switches PS1 and PS2 to the "manual
pumpdown" position. After the compressors have pumped
down, turn off the chilled water pump. Note: With the unit in
this condition, it will not restart until these switches are turned
back on. The unit has one-time pumpdown. It is important that
the compressors pump down before the water flow to the unit
is interrupted to avoid freeze-up in the evaporator.
Leave S1 on and power to the unit so that the crankcase
heaters will remain energized.
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