York YCUL0020, Installation, Operation And Maintenance Manual

Page: 16 / 178

JOHNSON CONTROLS
16
Form 150.63-NM9
Issue date: 5/20/2021
SECTION 2 – PRODUCT DESCRIPTION
driven, and positioned for vertical air discharge. The
fan guards are constructed of heavy-gauge, rust-resis-
tant, PVC (polyvinyl chloride)-coated steel wire.
Motors
The fan motors are totally enclosed air-over (TEAO),
squirrel-cage type, current protected. They feature ball
bearings that are double-sealed and permanently lubri-
cated.
Microcomputer Control Center
All controls are contained in a NEMA 3R/12 cabinet
and include Liquid Crystal Display (LCD) with Light
Emitting Diode (LED) backlighting for outdoor view-
ing. The display includes the following features:
• Two display lines
• Twenty characters beforeline
Display/Print
Color coded 12-button non-tactile keypad with sec-
tions for display and print of typical information:
• Suction temperatures (optional)
• Ambient temperature
• System pressures (each circuit)
• Operating hours and starts (each compressor)
• Print calls up to the liquid crystal display
• Operating data for the systems
• History of fault shutdown data for up to the last
six fault shutdown conditions.
• An RS-232 port, in conjunction with the press-to-
print button, is provided to allow hard copy print-
outs through a separate printer (by others).
Entry
This section is used to enter setpoints or modify system
values.
Setpoints
Updating can be performed to:
• Suction pressure setting
• Suction pressure control zone
• Remote reset temperature range
• Set daily schedule/holiday for start/stop
• Manual override for servicing
• Low and high ambient cutouts
• Number of compressors
• Low suction pressure cutout
• High discharge pressure cutout
• Anti-recycle timer (compressor start cycle time)
• Anti-coincident timer (delay compressor starts)
Unit
This section is used to:
• Set clock
• Set options
• Set unit option
Set unit control for Discharge Air Temperature Control
or for Suction Pressure Control (requires Suction Pres-
sure Transducers) is standard.
Unit On/Off Switch
The microprocessor control center is capable of
display ing the following:
• Suction temperatures (optional)
• Low ambient temperature cutout setting
• English or metric data
• Suction pressure cutout setting
• Each system suction pressure
• System discharge pressure
• Discharge air temperature reset through a YORK
ISN DDC or Building Automation System (by
others) using the following:
• A pulse-width modulated (PWM) input as
standard
• A 4 mA to 20 mA or 0 VDC to 10 VDC input,
or contact closure with the optional B.A.S.
interface option