York YCIV, Manual

Page: 78 / 80

JOHNSON CONTROLS 78
FORM 201.23-EG2 (713)
data for last ten shutdown faults. Compressor suc-
tion, discharge, and oil pressures and temperatures,
suction and discharge superheats, percent of full-load,
operating hours, starts, and anti-recycle timer status.
Status Messages for manual override, unit switch off,
compressor run, run permissive, remote controlled
shut down, no cooling load, daily/holiday shut down,
anti-recycle timer.
E. Predictive Control Points: Unit controls shall avoid
safety shutdown when operating outside design con-
ditions by optimizing the chiller controls and cooling
load output to stay online and avoid safety limits be-
ing reached. The system shall monitor the following
parameters and maintain the maximum cooling output
possible without shutdown of the equipment: motor
current, suction pressure and discharge pressure.
F. System Safeties: Shall cause individual compressor
systems to perform auto-reset shut down; manual reset
required after the third trip in 90 minutes. Includes:
high discharge pressure or temperature, low suction
pressure, high / low motor current, high motor tem-
perature, high pressure switch, high / low differential oil
pressure, high oil temperature, low suction superheat,
critical sensor malfunction, low or high current, phase
loss/single phase power, overload of motor windings,
and low voltage.
G. Unit Safeties: Shall be automatic reset and cause
compressors to shut down if: high or low ambient, low
leaving chilled liquid temperature, under voltage, and
flow switch operation. Contractor shall provide flow
switch and wiring per chiller manufacturer require-
ments.
H. Manufacturer shall provide any controls not listed
above, necessary for automatic chiller operation. Me-
chanical Contractor shall provide field control wiring
necessary to interface sensors to the chiller control
system.
2.07 ACCESSORIES and OPTIONS
Some accessories and options supersede standard prod-
uct features. Your Johnson Controls representative will be
pleased to provide assistance.
A. Sound Reduction
1. Provide the following options as required to meet
scheduled sound performance data at all load
points.
a. Normal speed fans and unlined compressor
enclosure. ( Factory Mounted )
b. Two-speed fans and acousticallly lined enclo-
sure. ( Factory Mounted )
c. Sound power octave band data, dB per AHRI
standard 70 and IAW ISO3744 at 35°C ambi-
ent and 7°C leaving chilled water.
2. Provide optional control input to limit sound out-
put of the chiller based on time of day. Shall be
programmable at the chiller panel or controlled
remotely via signal (4-20mA or 0-10 VDC) from
BAS system. Chillers without this feature shall
be provided with the necessary sound attenua-
tion to meet the scheduled sound performance
data at all load points.
B. Power Supply/Connections:
1. Circuit breaker is optional at point of incoming
single point connection to provide disconnect-
ing means AND be sized to provide the motor
branch circuit protection, short circuit protec-
tion and ground fault protection for the motor
branch-circuit conductors, the motor control
apparatus and the motors. Circuit breaker shall
be equipped with lockable operating handle that
shall extend through power panel door so that
power may be disconnected without opening any
panel doors.
C. Condenser Coil Environmental Protection:
1. PRE-COATED FIN CONDENSER COILS –
The air-cooled condenser coils are constructed
of epoxy-coated aluminum fins.
2. COPPER FIN – Provide condenser coils with
copper fins in lieu of aluminum fins.
3. POST-COATED EPOXY DIPPED CONDENSER
COILS – The unit is built with dipped-cured con-
denser coils.
D. Protective Chiller Panels ( Factory Mounted ):
1. Louvered Panels (condenser coils only): Painted
steel to match unit panels, over external condenser
coil faces.
2. Wire Panels (full unit): Heavy gauge, welded wire
mesh, coated to resist corrosion, to protect con-
denser coils from incidental damage and restrict
unauthorized access to internal components.
3. Louvered Panels (full unit): Painted steel to
match unit panels, to protect condenser coils
from incidental damage, visually screen internal
components, and prevent unauthorized access
to internal components.
4. Louvered/Wire Panels: Louvered steel panels on
external condenser coil faces, painted to match
Guide Specifications