AAON LL-540 - Manual (Page 38)

38
Startup
(See back of the manual for startup form)
Before the startup of the chiller and boilers
be sure that the following items have been
checked.
1. Verify that electrical power is available
to the unit.
2. Verify that any remote stop/start device
connected to the chiller (and boiler)
controller is requesting the chiller (and
boiler) to start.
3. Verify that liquid flow is present through
the chiller (and boiler) from the building.
4. There should be a building load of at
least 25% of the chiller (and boiler)
capacity in order to properly check
operation.
5. With the main power switch off, review
the MCS Controller Manual provided
with the chiller. Understand the keypad
functions, how to set the leaving water
temperature setpoint and how to initiate
the Run State.
Use the general check list at the top of the
startup form to make a last check that all the
components are in place, water flow is
present, and the power supply is energized.
Using the controller keypad, individually set
the outputs in “Manual On” to confirm relay
closure and compressor operation.
Cycle through all the compressors (and
boilers) to confirm that all are operating
within tolerance.
While performing the check, use the startup
form to record observations of compressor
amps, refrigerant pressures and boiler amps.
When all is running properly, place the
controller in the Run mode and observe the
system until it reaches a steady state of
operation.
Note:
For more information on
programming the controller refer to the
MCS Controller manual provided with the
chiller.
Electric shock hazard. Shut off all
electrical power to the unit to avoid
shock hazard or injury from rotating
parts.
WARNING
Improper installation, adjustment,
alteration, service or maintenance
can
cause property damage,
personal injury or loss of life. Startup
and service must be performed by a
Factory Trained Service Technician.
WARNING
Rotation must be checked on all
MOTORS AND COMPRESSORS of
three phase units. All motors, to
include and not be limited to pump
motors and condenser fan motors,
should all be checked by a qualified
service technician at startup and any
wiring alteration should only be made
at the unit power connection.
CAUTION