Quantech QCC2015CEE, Installation, Operation And Maintenance Manual, Page: 14 / 172

QUANTECH
14
Form QCC2-NM1
Issue Date: 5/20/2021
SECTION 2 – PRODUCT DESCRIPTION
Low sound fans
The condenser fans are composed of corrosion resis-
tant aluminum hub and composite blades molded into
a low noise airfoil section. They are designed for maxi-
mum efficiency and are statically and dynamically bal-
anced for vibration-free operation. They are directly
driven, and positioned for vertical air discharge. The
fan guards are constructed of heavy-gauge, rust-resis-
tant, PVC (polyvinyl chloride)-coated steel wire.
Motors
The fan motors are Totally Enclosed Air-Over, squirrel-
cage type, current protected. They feature ball bearings
that are double-sealed and permanently lubricated.
Microcomputer control center
All controls are contained in a NEMA 3R/12 cabinet
with hinged outer door and include Liquid Crystal Dis-
play (LCD) with Light Emitting Diode (LED) back-
lighting for outdoor viewing and includes:
• Two display lines
• Twenty characters per line
Display/Print
Color coded 12-button non-tactile keypad with sec-
tions for display and print of typical information:
• Suction temperatures (optional)
• Ambient temperature
• System pressures (each circuit)
• Operating hours and starts (each compressor)
• Print calls up to the liquid crystal display
• Operating data for the systems
• History of fault shutdown data for up to the last
six fault shutdown conditions.
• An RS-232 port, in conjunction with the press-to-
print button, is provided to allow hard copy print-
outs via a separate printer (by others).
Entry
This section is used to enter setpoints or modify system
values.
Setpoints
Updating can be performed to:
• Suction pressure setting
• Suction pressure control zone
• Remote reset temperature range
• Set daily schedule/holiday for start/stop
• Manual override for servicing
• Low and high ambient cutouts
• Number of compressors
• Low suction pressure cutout
• High discharge pressure cutout
• Anti-recycle timer (compressor start cycle time)
• Anti-coincident timer (delay compressor starts)
Unit
This section is used to:
• Set clock
• Set options
• Set unit option
Set unit control for Discharge Air Temperature Control
or for Suction Pressure Control (requires Suction Pres-
sure Transducers) is standard.
Unit On/Off switch
The microprocessor control center is capable of
display ing the following:
• Suction temperatures (optional)
• Low ambient temperature cutout setting
• English or Metric data
• Suction pressure cutout setting
• Each system suction pressure