York YLAA Operation Manual page 59

Guide Specifications (Cont'd)
JOHNSON CONTROLS
5. Programmable Setpoints (within Manufacturer limits): display language; chilled liq-
uid temperature setpoint and range, remote reset temperature range, daily sched-
ule/holiday for start/stop, manual override for servicing, low and high ambient cut-
outs, low liquid temperature cut-out, low suction pressure cut-out, high discharge
pressure cut-out, anti-recycle timer (compressor start cycle time), and anti-coinci-
dent timer (delay compressor starts).
6. Display Data: Return and leaving liquid temperatures, low leaving liquid tempera-
ture cut-out setting, low ambient temperature cut-out setting, outdoor air tempera-
ture, English or metric data, suction pressure cut-out setting, each system suction
pressure, discharge pressure (optional), liquid temperature reset via a 4-20 milliamp
or 0-10 VDC input, anti-recycle timer status for each compressor, anti-coincident
system start timer condition, compressor run status, no cooling load condition, day,
date and time, daily start/stop times, holiday status, automatic or manual system
lead/lag control, lead system definition, compressor starts/operating hours (each),
status of hot gas valves, evaporator heater and fan operation, run permissive sta-
tus, number of compressors running, liquid solenoid valve status, load & unload
timer status, water pump status.
7. System Safeties: Shall cause individual compressor systems to perform auto shut
down; manual reset required after the third trip in 90 minutes. System Safeties in-
clude: high discharge pressure, low suction pressure, high pressure switch, and
motor protector. Compressor motor protector shall protect against damage due to
high input current or thermal overload of windings.
8. Unit Safeties: Shall be automatic reset and cause compressors to shut down if low
ambient, low leaving chilled liquid temperature, under voltage, and flow switch op-
eration.
9. Alarm Contacts: Low ambient, low leaving chilled liquid temperature, low voltage,
low battery, and (per compressor circuit): high discharge pressure, and low suction
pressure.
10. BAS Communications: YORKTalk 2, BACnet MS/TP, Modbus and N2 communica-
tion capabilities are standard. (Option: LON communication via ELink Microgate-
way)
D. Manufacturer shall provide any controls not listed above, necessary for automatic
chiller operation. Mechanical Contractor shall provide field control wiring necessary to
interface sensors to the chiller control system.
2.06 POWER CONNECTION AND DISTRIBUTION
A. Power Panels:
1. NEMA 3R raintight, powder painted steel cabinets with hinged, latched, and gasket
sealed outer doors. Provide main power connection(s), control power connections,
compressor and fan motor start contactors, current overloads, and factory wiring.
2. Power supply shall enter unit at a single location, be 3 phase of scheduled voltage,
and connect to individual terminal blocks per compressor. Separate disconnecting
means and/or external branch circuit protection (by Contractor) required per appli-
cable local or national codes.
FORM 150.72-EG6 (516)
59