York YVAA, Installation, Operation & Maintenance Instructions Manual, Page: 22 / 178

JOHNSON CONTROLS
22
FORM 201.28-NM1.1
ISSUE DATE: 1/31/2018
SECTION 2 - PRODUCT DESCRIPTION
End Hail Guard – Louvered panels, painted with the
same color as the unit, are installed on the rear of the
unit (opposite end of the control panel) to protect the
exposed condenser from flying debris or hail.
V-Guard Panels – Solid panels, painted the same col-
or as the unit, are installed along the sides of the units
to cover exposed piping within the condenser section
without impacting airflow. These guard panels can be
combined with End Hail Guard option for additional
protection from debris.
Evaporator Options
38 mm insulation – Double thickness insulation
provided.
Flange Kit –
Provides contractor with the couplings
best suited to tie into the chilled water piping. All
flanges are PN10.
Connection Location – The standard unit configura-
tion is available with fluid inlet connections at rear
(opposite control panel end) of unit. Option available
for front fluid inlet on select configurations.
Water Box Heater – The standard unit comes with
evaporator shell heaters and water pump control soft-
ware. Optional water box heaters are required for stor-
age below 0°F (-17°C). See the Refrigerant Valve - Off
option on page 100 for more information on freeze
protection .
Controls Options
High Ambient Operation – This provides special
control logic coupled with high airflow fans to permit
high ambient up to 52°C (125°F) operation. Fans are
airfoil type blades with high power motors. This option
may also allow for increased machine capacity, allow-
ing the selection of a smaller chassis to meet specific
capacity requirements.
Building Automation System Interface (Tempera-
ture) –
Factory installed option to accept a 4 to 20mA
or a 0 to 10VDC input to allow remote reset of the
Leaving Chilled Liquid Temperature Setpoint. The
setpoint can be positively offset upwards up to 22.2°C
(40°F). This option is useful for ice storage or process
applications or for periods where higher chilled liquid
temperatures are adequate for low loads. Available
alone or in combination with BAS Load Limit.
Building Automation System Interface (Load
Limit) – Factory installed option to accept a 4 to 20mA
or a 0 to 10VDC input to allow remote reset of the Load
Limit Setpoint. The setpoint can limit system demand
from 30-100%. Available alone or in combination with
BAS Temperature Reset.
E-Link – The optional E-Link gateway provides com-
munication between the equipment and Building Auto-
mation Systems, including BACnet (MS/TP), Modbus,
LON and N2.
Thermal Storage – Provides special control logic and
modifications to produce leaving chilled brine temper-
atures below 4.4°C (40°F) primarily at times of low
ambient temperatures (night time). Option can be used
to produce ice to supplement cooling and significantly
decrease energy costs. The capability of the chiller is
enhanced by using both ice and chilled water simulta-
neously during times of peak cooling needs.
General Options
Flow Switch Accessory – Vapor proof SPDT, NEMA
3R switch, 10.3 barg (150 psig) DWP, -29°C to 121°C
(-20°F to 250°F) with 1" NPT (IPS) connection for
upright mounting in horizontal pipe. This flow switch
or equivalent must be furnished with each unit.
Field
mounted.
Differential Pressure Switch –
This 0.2-3 barg (3-45
psig) range switch, with 1/4" NPTE pressure connec-
tions, is an alternative to the paddle-type flow switch.
Field mounted.
Service Isolation Valve –
Service suction isolation
valve added to unit for each refrigerant circuit.
Dual Pressure Relief Valve – Two safety relief valves
are mounted in parallel; one is always operational to
assist in valve replacement during maintenance.
Terminal Block [not available for CE marked units]
Terminal Block connections shall be provided at the
point of incoming single point connection for field
connection and interconnecting wiring to the compres-
sors. Separate external protection must be supplied,
by others, in the incoming power wiring, which must
comply with local codes.