York YVAA Installation Operation & Maintenance page 20

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.
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 configu-
ration is available with fluid inlet connections at the
right-side or left-side (for two-pass configuration) of
the evaporator. Option available for front fluid inlet
(control panel end) and back fluid connections for
three-pass evaporators. Three-pass evaporators have
inlet and outlet connections on the opposite ends.
Water Box Heater – Unless an appropriate freeze pro-
tection fluid is used in the chilled fluid circuit, optional
water box heaters are required if the chiller is exposed
to environments that reach ambient temperatures be-
low 00F (-17.80C). When the water box heaters are
operated along with other required freeze protection
protocols, they assist in protecting the evaporator from
freeze damage in ambient temperatures down to -200F
(-290C). A separate, customer supplied 120 V/60 Hz
or 230 V/50 Hz single phase power supply is required
to provide power to the water box heaters. In order to
control the operation of the water box heaters, continu-
ous power must be provided to the chiller control pan-
el. See the Commissioning section for the requirements
for protection against freeze damage.
Controls Options
High Ambient Operation – This provides special
control logic coupled with high airflow fans to permit
high ambient up to 55°C (131°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.
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Building Automation System Interface (Tempera-
ture) – Factory installed option to accept a 4 mA to 20
mA or a 0 VDC to 10 VDC 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. Avail-
able alone or in combination with BAS Load Limit.
Building Automation System Interface (Load
Limit) – Factory installed option to accept a 4 mA to
20 mA or a 0 VDC to 10 VDC input to allow remote
reset of the Load Limit Setpoint. The setpoint can limit
system demand from 30% to 100%. Available alone or
in combination with BAS Temperature Reset.
SC-EQUIP Gateway – The optional SC-EQUIP Gate-
way provides communication between the equipment
and Building Automation 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 in. 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 barg to 3 barg
(3 psig to 45 psig) range switch, with 1/4 in. NPTE
pressure connections, is an alternative to the paddle-
type flow switch. Field mounted.
Thermal Dispersion Flow Switch – Alternative to
the paddle-type flow switch and differential pressure
switch, this electronic flow switch requires 115 VAC
50 Hz or 60 Hz power supply. Field mounted.
Service Isolation Valve – Service suction isolation
valve added to unit for each refrigerant circuit.
Form 201.47-ICOM1
Issue date: 17/11/2022
JOHNSON CONTROLS