AAON LZ Series, Установка, эксплуатация и обслуживание

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Test the chiller operation by changing the
Run/Stop switch to “Run”, and enabling one
system at a time. The compressors should not
be placed in “Manual On” for any period
longer that what is required to check for
proper rotation. The Electronic Expansion
Valves will not function when the
compressor is operated in this mode.
Using the circuit disable switches, cycle
through all compressors to ensure they are
operating
within tolerance. While
performing checks, use the startup form to
record observations of compressor amps,
refrigerant pressures and temperatures.
Pressure readings should be independently
verified using a set of calibrated gauges. If
necessary apply offsets to the unit
controller’s readings through the MCS
Controls display or through the MCS
Connect PC program.
When all compressors have been observed to
function correctly, enable all circuits and
observe the chiller until it reaches a steady
state of operation. If necessary, adjust
leaving water setpoint to match desired
target. For units with BMS communication,
verify that the BMS system can access and
modify all necessary points.
Chillers that are provided with single point
piping connections for two evaporator barrels
are equipped with balancing valves on each
heat exchanger. Flow should be balanced
between the two evaporators by a hydronic
systems balancing professional.
Note : For more information on programming
the controller refer to the MCS Controller
manual provided with the chiller.
Condenser Fan Pitch Adjustment
Units installed at elevations above 2,000 feet
may require adjustment of the condenser fan
pitch to achieve optimal performance. See
Table 6 or Table 7 for the correct pitch
values.
Table 6 - Air-Cooled Condenser Fan Pitch
Altitude Pitch
0-2,000’ (Factory Default) 35
°
2,000’-4,000’
37.5
°
Over 4,000’
40
°
Table 7 - Evaporative-Condensed Chiller
Fan Pitch
Altitude Pitch
0-6,000’ (Factory Default) 30
°
Over 6,000’
35
°
Multi-Wing Z Series Aluminum Fan Blade
Pitch Angle Setting Instructions
1. Maintain the balance of fan
Mark the hub castings across a joint, so the
fan hub can be reassembled in the same
orientation.
Mark the location of any balancing weight.
Balancing weight will be on the outer bolt
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
Before completing installation, a
complete operating cycle should be
observed to verify that all components
are functioning properly.
CAUTION