McQuay WGS130AA: WGS140AW, Руководство по эксплуатации

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OM WGS-5 WGS 130A to 190A 23
Start-Up and Shutdown
Pre Start-up
1. Flush and clean the chilled-water system. Proper water treatment is required to prevent
corrosion and organic growth. A 20-mesh strainer is required at the evaporator chilled-
water inlet and should be cleaned after system flushing.
!
CAUTION
Failure to flush, clean and provide system water treatment can damage the unit.
2.
With the main disconnect open, check all electrical connections in control panel and
starter to be sure they are tight and provide good electrical contact. Connections are
tightened at the factory, but can loosen enough in shipment to cause a malfunction.
!
CAUTION
Lock and tag out all power sources when checking connections. Electrical shock
can cause severe personal injury or death
. .
3.
Check and inspect all water piping. Make sure flow direction is correct and that piping
is made to the correct connection on evaporator and condenser.
4. Check that refrigerant piping on remote condensers is connected to the correct circuits
and not crossed and has been properly leak tested and evacuated.
5. Open all water flow valves to the condenser and evaporator.
6. 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.
7. Check to see that the evaporator water temperature sensor is securely installed.
8. Make sure the unit control switch S1 is open OFF and the circuit switches CS1 and CS2
are open. Place the main power disconnect switch to ON. This will energize the
compressor sump heaters. Wait a minimum of 12 hours before starting the unit.
9. Measure the water pressure drop across the evaporator and condenser, and check that
water flow is correct (on pages 26 and 27) 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 McQuay 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. Replace valve seal
caps.
2. Open the two manual liquid line shutoff valves (king valves).