Daikin WGZ030DW, Installation, Operation And Maintenance Manual

Startup and Shutdown Procedures

www.DaikinApplied.com 61 

IOM 1322-1 • WATER-COOLED SCROLL COMPRESSOR

Complete operating instructions are contained in the current 

version of Operating & Maintenance Manual found on 

www.

DaikinApplied.com

.

 DANGER

LOCKOUT/TAGOUT 

all power sources prior to starting, pressurizing, 

de-pressuring, or powering down the Chiller. Failure to follow this warning 

exactly can result in serious injury or death. Be sure to read and understand 

the installation, operation, and service instructions within this manual.

NOTE: 

Installation and maintenance are to be performed 

only by qualified personnel who are familiar with local 

codes and regulations, and experienced with this type 

of equipment.

NOTE: 

Return the “Scroll Compressor Equipment Warranty 

Form” on 

page 73

 within 10 working days to 

Daikin Applied as instructed on the form to obtain full 

warranty benefits. 

 CAUTION

Dyes used for refrigerant leak detection are not tested or recommended for 

use in Daikin chillers. Use of these products may damage and/or degrade 

the performance of the equipment and will void the manufacturer warranty.

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.  Check water pressure drop across evaporator and 

condenser, and see that water flow is correct (beginning 

on 

page 12

) per the 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, 

/- 10%, and that phase voltage unbalance does 

not exceed 2%. 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.

14 . 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.  Leak test the unit.
4. 

Check to see that the unit circuit breakers are in the “off” 

position.

5.  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.

6.  Put the main power and control circuit disconnects to the 

“on” position.

7.  Verify crankcase heaters have operated for at least 12 

hours prior to start-up. Crankcase should be warm to the 

touch.

8.  Check that the MicroTech II controller is set to the 

desired chilled water temperature.

9.  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.

10.  Check resets of all equipment protection controls.

11.  Switch on the unit circuit breakers.

12.  Set pumpdown switches PS1 and PS2 to “auto” for 

restart and normal operation.

13.  Start the system by setting the system switch S1 to on.
14.  After running the unit for a short time, check the oil level 

in each compressor crankcase, rotation of condenser 

fans (if any), and check for flashing in the refrigerant 

sight glass.

15.  After system performance has stabilized, it is necessary 

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 

Startup and Shutdown Procedures