Koer C35-VAV..., Техническое руководство

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10
C35-VAV 11 C35-VAV
6. First Power Up and Commissioning
Once C35-VAV… has powered on a boot up screen will be displayed. The home screen, as
shown on page 12 will appear once the device has finished booting up. The internal sensors
require time to stabilize and power up. Only adjust offsets once the unit has had sufficient
time (outlined below) to complete this process. Once the required time has elapsed compare
sensors readings against a reference instrument. If required, the device can be calibrated using
the Offsets menu instructions on page 25.
6.1. Temperature measurement
The C35-VAV… uses Internal Temperature Compensation (ITC) Algorithm to eliminate heat
generated by internal electronic components. The ITC Algorithm requires up to 30 minutes to
stabilize and achieve accurate temperature readings. Thermal resistance of surface on which
the device is mounted will affect temperature readings.
6.2. Relative humidity measurement
Built-in humidity sensor (optional) utilizes temperature readings to calculate relative humidity.
Allow 30 minutes for the device to calculate accurate readings of temperature and relative
humidity prior to adjusting offsets.
NOTE: If offset is added to temperature readings it will affect relative humidity readings.
6.3. Carbon dioxide (CO
2
) measurement
The C35-VAV-C… uses Non-dispersive Infrared (NDIR) CO
2
sensor to measure carbon dioxide
concentration. The sensor uses automatic calibration procedure and it requires up to 7 days
calibration. The calibration procedure keeps track of lowest CO
2
concentration reading and
uses that measurement as a default calibration point. The automatic calibration procedure is
repeated on an ongoing (weekly) basis.
7. Touch screen operation and Maintenance
The C35-VAV… is primarily operated through its 3.5” resistive touch screen.
• The screen should not be operated with sharp objects which can scratch or damage the screen.
• To clean the screen, simply wipe the front facing screen using a slightly damp cloth.
CAUTION : Do not expose the device’s vents to liquids and do not use any cleaning agents on
the device as this may result in sensor malfunction or incorrect readings.
8. Definitions
Term Description
BACnet A communication protocol for Building Automation and
Control Networks
C35-VAV…
Configurable zone temperature, carbon dioxide and relative
humidity controller for pressure depended or pressure
independent VAV systems
Changeover
Change from heating to cooling or vice versa
Control mode The method used (Heating/Cooling) to bring the controlled
zone to the target temperature
Control sequence This parameter defines whether the HVAC system is capable of
heating, cooling or heating and cooling, the controlled zone
CO
2
Carbon dioxide (measured in ppm)
Cooling / Heating Setpoints The desired temperature range (°C)
Data Bus RS485 physical layer standard for data transition
ECM Electronically Commutated Motors. C35-VAV… is equipped
with a 0-10v output for ECM fan control
HVAC Heating Ventilation & Air Conditioning
Kd
Derivative gain for PID controller
Ki Integral gain for PID controller
Kp Proportional gain for PID controller
MS/TP Master-Slave Token Passing
Offset The manual adjustment required to calibrate the temperature,
CO
2
or relative humidity, as measured by the sensor
PID controller Proportional Integral Derivative controller
ppm Parts per million
% rh Relative humidity (%)
RTD Resistive Temperature Detector
Setpoints The target value in a closed-loop feedback system
VAV Variable Air Volume