QUANTECH
FORM QCC3-EG1 (517)
8
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
Summary of Contents for QCC3
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