AAON LZ Series, Installation Operation & Maintenance, Page: 46 / 104

46
Startup
(See back of the manual for startup form)
Before starting the chiller for the first time,
verify the following items have been
checked:
1.
Verify that electrical power is available
and that the voltage is correct and the
capacity is equal to or greater than the
unit’s MOP listed on the nameplate. If
the chiller has an evaporative cooled
condenser, verify that the make-up water
supply
is available and properly
connected.
2.
Chillers selected to use standard water are
provided with a connection for city make-
up water, verify that this is available and
properly connected. Glycol chillers may
be selected with an auto-glycol feeder. If
present verify that this has been set up
correctly and filled with the proper water-
glycol mixture (see Glycol Auto Fill
Unit). Open automatic air vents as shown
in (Automatic Air Vent Valves).
3. Before applying power, review the MCS
Controller manual provided with the
chiller. Understand the operation of the
controller display panel as well as the
MCS Connect PC program.
4.
Verify that all crankcase heaters are
operating correctly. The crankcase
heaters must be energized for at least 24
hours before starting the compressors to
clear any liquid refrigerant from the
compressors.
5.
Verify that the rotation of all pumps,
motors, and compressors are correct. The
rotations have been checked at the
factory, so if any motors that are not
powered by a Variable Frequency Drive
are operating backwards two phases
should be switch at the unit power
connection.
6.
Verify that any remote stop/start device
or BMS signal is connected to the chiller
controller and requesting the chiller to
start.
7.
With the proper pumps running, verify
that there is liquid flow through the
chiller. This can be checked by
monitoring the status of the chiller’s flow
switch or verifying a pressure drop using
the provided pressure gauges.
8.
A building load of at least 25% of the
chiller capacity should be present in order
to properly check operation.
9.
Complete the general check list at the top
of the startup form to make a last check
that the chiller is ready to operate.
Use the general check list at the top of the LZ
Series Startup Form to make a last check that
all the components are in place, water flow is
present, and the power supply is energized.
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