York YCAS Installation Operation & Maintenance Download

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YORK INTERNATIONAL

FORM 201.19-NM6 (804)

Control Circuit Terminal Block

A 120V, 20A control circuit power terminal strip lo cat ed
in the control panel to accept a fi eld provided control
power supply, rather than the standard factory mounted
control circuit transformer. The supply with appropriate
branch circuit protection in accordance with applicable
Local codes, provides the unit control cir cuit power sup-
ply via the panel mounted Emergency Stop Switch.

Building Automation System (BAS) Interface

Provides a means to reset the leaving chilled liquid tem-
per a ture or percent full load amps (current limiting) from
the BAS (Factory-mounted):

Printed circuit board to accept 4 to 20mA, 0 to 10VDC,
or dry contact closure input from the BAS.

A YORK ISN Building Automation System can pro-
vide a Pulse Width Modulated (PWM) signal direct to
the standard control panel via the standard on-board
RS485 port.

Condenser Coil Protection

The standard condenser coils have Aluminum fi ns, cop-
per tubes, and galvanized steel supports for generally
adequate corrosion resistance. However, these ma te ri als
are not adequate for all environments.

The following options provide added protection:

Black fi n condenser coils –

Condenser coils con struct ed

using black epoxy coated Aluminum fi n stock for cor-
ro sion resistance comparable to copper fin coils in
typ i cal seashore locations.

Copper fi n condenser coils –

Coils constructed with

corrosion resistant copper fi ns. Not recommended in
areas where units may be exposed to acid rain.

Phenolic coated condenser coils –

Completed con-

dens er coil assemblies are covered with a cured Phe nol ic
coating. Probably the most suitable selection for sea-
shore locations where salt spray may come into con tact
with the fi ns, and other corrosive applications ex cept:
strong alkalis, oxidizers, and wet bromine, chlo rine, and
fl uorine in concentrations greater than 100 PPM.

The standard display language is English, with 4 other
languages available.

Entry

–

Used to confi rm Set Point changes, cancel

in puts, advance day, and change AM/PM.

Setpoints

–

For setting chilled liquid temperature,

chilled liquid range, remote reset temperature range.

Clock

–

Used to set time, daily or holiday start/stop

schedule and manual override for servicing.

Print

–

Used to display or print operating data or sys tem

fault shutdown history for last six faults. (4 in YCAS 3
Compressor and YCAS 4 Compressor models). Printouts
through an RS-232 port via a separate print er.

Program

For setting low leaving liquid temperature cutout, 300
to 600 second anti-recycle timer, average motor cur rent
unload point, liquid temperature setpoint reset sig nal
from YORK ISN or building automation system.

Additional functions (password protected) for pro-
gram ming by a qualifi ed service technician:

Cutouts for low and high ambient, low suction pres-
sure and high discharge pressure, refrigerant type, high
dis charge pressure unload setpoint.

ACCESSORIES AND OPTIONS

Multiple Point Power Connection

Standard fi eld power wiring connection on all models is
Multiple Point Power Connection. Field provided pow er
supply circuits, with appropriate branch circuit pro tec -
tion, are connected to factory provided terminal blocks,
non-fused disconnect switches or circuit breakers.

Single-Point Power Connection with Individual
Circuit Protection

A single-point supply circuit with fi eld provided
pro tec tion is connected to a factory provided terminal
block or non-fused disconnect switch located in the
options com part ment. Factory wiring is provided from
the ter mi nal block or disconnect switch to factory
supplied internal branch circuit breakers with lockable
external handles in the power compartments.