York YVAA, Installation, Operation & Maintenance Instructions Manual, Page: 21 / 178

JOHNSON CONTROLS
21
FORM 201.28-NM1.1
ISSUE DATE: 1/31/2018
SECTION 2 - PRODUCT DESCRIPTION
2
Extreme Conditions –
During extreme or unusual
conditions (that is, blocked condenser coils, ambient
above scheduled maximum, and so on) the chiller con-
trol system will avoid shutdown by varying capacity.
By monitoring motor current and suction and discharge
pressures, the chiller can maintain maximum available
cooling output without shutting down.
Unit Safeties are provided for the chiller to perform
auto-reset shut down for the following conditions:
• Ambient temperature above or below allowable
range
• Out of range leaving chilled liquid temperature
• Under voltage
• Flow switch operation
ACCESSORIES AND OPTIONS
All options factory mounted unless otherwise noted.
Sound Attenuation
Low Noise Kits – The standard chiller configuration is
equipped with low sound fans and acoustic treatments
on the refrig erant lines and compressors. There are
several sound attenuation options available to further
reduce sound at its source thereby meeting local sound
level regulations.
SilentNight™ – Due to time of day based sound regu-
lations in some locations it may be desirable to force
the chiller to a lower sound level on demand. The
SilentNight control option provides a control input
to limit sound output of the chiller based on time of
day. This feature is programmable at the chiller panel
or can be controlled remotely via a signal (4-20mA or
0-10VDC) from a BAS system.
FAN OPTIONS
Ultra Quiet Fans – The chiller is equipped with spe-
cially designed fans and motors to provide lower sound
levels yet retain appropriate airflow. The result is re-
duced fan generated sound with minimal effect on the
chiller capacity or efficiency.
High Static Fans – The chiller is equipped with con-
denser fans with higher power motors suitable for
high external static pressure, up to 100 Pa (0.4 water),
across condenser coils. This option should be selected
if additional airflow resistance may be present due to
flow restrictions such as field installed ducts, filters,
sound enclosures and so on. Please contact your local
JCI representative for more information.
High Airflow Fans
– The chiller is equipped with con-
denser fans with airfoil type blades and high power mo-
tors providing extra airflow across coils. In some chiller
configurations, this option can provide an increase in
chiller capacity at high ambient. The high airflow fans are
also available with variable speed control. Please contact
your local JCI representative for more information.
CONDENSER COILS
Fin and tub condenser coils of seamless, internally-en-
hanced, high-condensing-coefficient, corrosion resis-
tant copper tubes are arranged in staggered rows. The
tubes are mechanically expanded into aluminum fins.
Integral subcooling is included. The design working
pressure of the coils is 350 PSIG (24 barg).
Condenser Coil Protection
The aluminum alloys used in the YVAA micro-chan-
nel condenser have been carefully selected and tested
for high corrosion resistance. However, all metals can
corrode in harsh conditions. Consider protecting coils
from corrosive environments such as coastal, marine,
urban and industrial.
Post-Coated Epoxy Dipped Condenser – Micro-
channel condenser coils applied with electro-deposited
and baked flexible epoxy coating that is finished with a
polyurethane UV resistant top-coat suitable for highly
corrosive applications.
Protective Chiller Panels
Wire Panels – UV stabilized black polyvinyl chloride
coated, heavy gauge, welded wire mesh guards mounted
on the exterior of the full unit. Protects condenser coil
faces and prevents unauthorized access to refrigerant
components (compressors, pipes, evaporator, and so on),
yet provides free air flow. This can cut installation cost
by eliminating the need for separate, expensive fencing.
Louvered Panels – Louvered panels, painted the same
color as the unit, enclose the unit to visually screen
and protect the coils as well as preventing unauthor-
ized access to internal components. Also available as a
condenser-only option.
Louvered/Wire Panels Combination – Louvered pan-
els, painted the same color as the unit, are mounted on
external condenser coil faces. Heavy gauge, welded
wire-mesh panels, coated to resist corrosion, are mounted
around base of machine to restrict unauthorized access.