Startup And Shutdown Procedures; Pre Startup - Daikin AGZ030E Installation, Operation And Maintenance Manual

Pre Startup

Inspect the chiller to ensure no components became loose or
damaged during shipping or installation including leak test and
wiring check. Complete the pre-start checklist at the front of
this manual and return to Daikin Applied prior to startup date.
Pre-Startup Water Piping Checkout
1. Check the pump operation and vent all air from the
system.
2. Circulate evaporator water, checking for proper system
pressure and evaporator pressure drop. Compare the
pressure drop to the evaporator water pressure drop
curve.
3. Flush System and clean all water strainers before placing
the chiller into service.
4. Check water treatment and proper glycol percent.
5. Pre-Startup Refrigerant Piping Checkout
6. Check all exposed brazed joints for evidence of leaks.
Joints may have been damaged during shipping or when
the unit was installed.
7. Check that all refrigerant valves are either opened or
closed as required for proper operation of the chiller.
8. A thorough leak test must be done using an approved
electronic leak detector. Check all valve stem packing for
leaks. Replace all refrigerant valve caps and tighten.
9. Check all refrigerant lines to insure that they will not
vibrate against each other or against other chiller
components and are properly supported.
10. Check all connections and all refrigerant threaded
connectors.
11. Look for any signs of refrigerant leaks around the
condenser coils and for damage during shipping or
installation.
12. Connect refrigerant service gauges to each refrigerant
circuit before starting unit.
Pre-Startup Electrical Check Out
Electrical power must be applied to the compressor crankcase
heaters 8 hours before starting unit to eliminate refrigerant
from the oil.
1. Open all electrical disconnects and check all power
wiring connections. Start at the power block and check
all connections through all components to and including
the compressor terminals. These should be checked
again after 3 months of operation and at least yearly
thereafter.
2. Check all control wiring by pulling on the wire at the
spade connections and tighten all screw connections.
Check plug-in relays for proper seating and to insure
retaining clips are installed.
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3. Put System Switch (S1) to the Emergency Stop position.
4. Put both circuit #1 & #2 switches to the Pumpdown and
Stop position.
5. Apply power to the unit. The panel Alarm Light will stay
on until S1 is closed. Ignore the Alarm Light for the check
out period. If you have the optional Alarm Bell, you may
wish to disconnect it.
6. Check at the power block or disconnect for the proper
voltage and proper voltage between phases. Check
power for proper phasing using a phase sequence meter
before starting unit.
7. Check for 120 Vac at the optional control transformer and
at TB-2 terminal #1 and the neutral block (NB).
8. Check between TB-2 terminal #7 and NB for 120 Vac
supply for transformer #2.
9. Check between TB-2 terminal #2 and NB for 120 Vac
control voltage. This supplies the compressor crank case
heaters.
10. Check between TB-3 terminal #17 and #27 for 24 Vac
control voltage.
Startup
Refer to the MicroTech III Controller information on
®
to become familiar with unit operation before starting the chiller.
There should be adequate building load (at least 50 percent
of the unit full load capacity) to properly check the operation of
the chiller refrigerant circuits.
Be prepared to record all operating parameters required by
the "Compressorized Equipment Warranty Form". Return
this information within 10 working days to Daikin Applied as
instructed on the form to obtain full warranty benefits.
Startup Steps
• Verify chilled water flow.
• Verify remote start / stop or time clock (if installed) has
requested the chiller to start.
• Set the chilled water setpoint to the required temperature.
(The system water temperature must be greater than the
total of the leaving water temperature setpoint plus one-
half the control band plus the startup delta-T before the
MicroTech III controller will stage on cooling.)
®
• Set the Evap Delta T based on a percent of unit nominal
flow indicated in page 33
starting point. Delta-T=Tons x 24 / gpm
• Check the controller setpoints to be sure that factory
defaults are appropriate.
• Put both pumpdown switches (PS1 and PS2) to the ON
position.
• Put system switch (S1) to ON position.
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