Quantech QWC3 Manual page 65

Guide Specifications (Cont'd)
QUANTECH
4. Forty character liquid crystal display, numeric data in English (or Metric) units.
Sealed keypad with sections for Setpoints, Display/Print, Entry, Unit Options &
clock, and On/Off Switch. Display descriptions and membrane keypad graphics
shown in English language.
5. Programmable Setpoints (within Manufacturer limits): display language; chilled
liquid temperature setpoint and range, remote reset temperature range, set daily
schedule/holiday for start/ stop, manual override for servicing, number of compres-
sors, low liquid temperature cutout, low suction pressure cutout, high discharge
pressure cutout, anti-recycle timer (compressor start cycle time), and anti-coinci-
dent timer (delay compressor starts).
6. Display Data: Return and leaving evaporator liquid temperatures, low leaving liquid
temperature cutout setting, English or metric data, suction pressure cutout setting,
each system suction pressure, discharge pressure, liquid temperature reset via a
0-20 VDC input, 2-10 VDC input or a 0-20mA input contact closure, anti-recycle
timer status for each compressor, anti-coincident system start timer condition, com-
pressor 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 (if
supplied), run permissive status, 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. Includes: high dis-
charge 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. Contractor shall provide flow switch installation and wiring per chiller manu-
facturer requirements.
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/EMS Temperature Reset: Chiller to accept 4 to 20mA, 0 to 10 VDC, or discrete
contact closure input to reset the leaving chilled liquid temperature.
D. Pressure Transducers and Readout Capability
1. Discharge Pressure Transducers: Permits unit to sense and display discharge pres-
sure.
2. Suction Pressure Transducers: Permits unit to sense and display suction pressure.
E. 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.
FORM QWC3-EG1 (217)
65