Startup and Shutdown
www.DaikinApplied.com 87
IOM 1242-8 • PATHFINDER
®
MODEL AWV CHILLERS
Startup and Shutdown
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.
DANGER
LOCKOUT/TAGOUT all forms of hazardous energy and
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.
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.
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.
NOTICE
Daikin Applied service personnel or factory authorized
service agency must perform initial startup in order to activate
warranty. Return the “Screw Compressor Equipment Warranty
Form” within 10 working days to Daikin Applied as instructed
on the form to obtain full warranty benefits.
CAUTION
Most relays and terminals in the unit control center are
powered when S1 is closed and the control circuit disconnect
is on. Therefore, do not close S1 until ready for startup or the
unit may start unintentionally and possibly cause equipment
damage.
Startup
“Chilled Water Piping” on page
are met. including flushing the system water piping
before
connecting to the unit.
2.
Verify chilled water flow rate and calibrate thermal
dispersion flow switch - see instructions on
.
3.
Double check that the discharge shutoff valve and the
optional compressor suction butterfly valves are open.
4.
Check that the manual liquid line shutoff valves at the
outlet of the subcooler coils are open.
5. Check the leaving chilled water temperature set point
on the MicroTech
®
III controller to be sure it is set at the
desired chilled water temperature.
6. Start the auxiliary equipment for the installation by
turning on the time clock, and/or remote on/off switch,
and chilled water pump.
7. Check to see that pumpdown switches Q1 and Q2 are in
the “Pumpdown and Stop” (open) position. Throw the S1
switch to the “Auto” position.
8. Repeat step 7 for Q2
9. Under the “Control Mode” menu of the keypad, place the
unit into the automatic Cool Mode.
10. Start the system by moving pumpdown switch Q1 to the
“Auto” position.
Temporary Shutdown
Move pumpdown switches Q1 and Q2 to the “Pumpdown and
Stop” position. After the compressors have pumped down, turn
off the chilled water pump.
CAUTION
Do not turn the unit off using the “Override Stop” switch,
without first moving Q1 and Q2 to the “Stop” position, unless
it is an emergency, as this will prevent the unit from going
through a proper shutdown/pumpdown sequence, resulting in
possible equipment damage.
CAUTION
The unit has a onetime pumpdown operation. When Q1
and Q2 are in the “Pumpdown and Stop” position, the unit
will pump down once and not run again until the Q1 and Q2
switches are moved to the “Auto” position. If Q1 and Q2 are
in the “Auto” position and the load has been satisfied, the unit
will go into onetime pumpdown and will remain off until the
MicroTech
®
III control senses a call for cooling and starts the
unit.
CAUTION
Water flow to the unit must not be interrupted before the
compressors pump down to avoid freeze-up in the evaporator.
Interruption will cause equipment damage.
CAUTION
If all power to the unit is turned off, the compressor heaters
will become inoperable. Once power is resumed to the unit,
the compressor and oil separator heaters must be energized
a minimum of 12 hours before attempting to start the unit.
Failure to do so can damage the compressors due to
excessive accumulation of liquid in the compressor.
Startup After Temporary Shutdown
1. Insure that the compressor and oil separator heaters
have been energized for at least 12 hours prior to
starting the unit.
2. Start the chilled water pump.
3. With system switch Q0 in the “On” position, move
pumpdown switches Q1 and Q2 to the “Auto” position.
4. Observe the unit operation until the system has
stabilized.
