Quantech QCC3 Manual page 8

FORM QCC3-EG1 (517)
Control Center (Cont'd)
• Anti-recycle timer status for each system
• 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 (Discharge Air Temperature control
only)
• Automatic lead/lag of compressors within a system
• Compressor starts & operating hours (each compressor)
• Status of hot gas valves, and fan operation
• Run permissive status
• Number of compressors running
• Liquid solenoid valve status
• Load & unload timer status
Provisions are included for: pumpdown at shutdown; optional remote discharge air tem-
perature reset and two steps of demand load limiting from an external building automation
system. Unit alarm contacts are standard.
The operating program is stored in non-volatile memory (EPROM) to eliminate chiller
failure due to AC powered
failure/battery discharge. Programmed setpoints are retained in lithium battery-backed
RTC memory for 5 years minimum.
Ambient Kit (High) – Required if units are to operate when the ambient temperature is
above 115°F (46°C). Includes sun shield panels and discharge pressure transducers.
(This option includes the Discharge Pressure Transducer /Readout Capabil ity option).
(Field mounted).
COMMUNICATIONS
• Native communication capability for BACnet (MS/TP) and Modbus
• Optional communciation available for N2 and LON via eLink option
8 QUANTECH