Quantech QCC2015CEE, Installation, Operation And Maintenance Manual, Page: 15 / 172

QUANTECH
15
SECTION 2 – PRODUCT DESCRIPTION
Form QCC2-NM1
Issue Date: 5/20/2021
2
• System discharge pressure
• Discharge Air Temperature Reset via a ISN DDC
or Building Automation System (by others) via:
• A pulse width modulated (PWM) input as
standard
• A 4 mA to 20 mA or 0 VDC to 10 VDC input,
or contact closure with the optional B.A.S.
interface option
• 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 sys-
tem
• Compressor starts and operating hours (each com-
pressor)
• Status of hot gas valves, and fan operation
• Run permissive status
• Number of compressors running
• Liquid solenoid valve status
• Load and unload timer status
Provisions are included for pumpdown at shutdown,
optional remote discharge air temperature 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 mem-
ory (EPROM) to eliminate condensing unit failure due
to AC powered failure/battery discharge. Programmed
setpoints are retained in lithium battery -backed RTC
memory for 5 years minimum.
Building automation system interface
The Microprocessor Board can accept a 4 mA to
20 mA, 0 VDC to 10 VDC or contact closure input
to reset the discharge air temperature from a Building
Automation System. Only one of the following remote
communications options can be offered on a unit at a
time: BAS Interface, Remote Control Panel or Multi-
unit Sequence Control (Factory Mounted).
• The standard unit capabilities include remote
start-stop, remote discharge air temperature re-
set through a PWM 4 mA to 20 mA or 0 VDC to
10 VDC input signal or up to two stages of de-
mand (load) limiting depending on model.
• The standard control panel can be directly con-
nected to a Quantech Building Automated Sys-
tem.
Communications
• Native communication capability for BACnet
(MS/TP) and Modbus
• Optional communication available for N2 and
LON via eLink option
Power panel
Each panel contains:
• Compressor power terminals
• Compressor motor starting contactors per Interna-
tional Electrotechnical Commission (I.E.C.).
• Control power terminals to accept incoming for
115-1-60 control power
• Fan contactors and overload current protection
The power wiring is routed through liquid-tight con-
duit to the compressors and fans.