Koer C35-VAV... User manual

C35-VAV... Technical Manual
Configurable zone temperature, carbon dioxide
and relative humidity controller for VAV systems
and universal HVAC applications
Firmware Version C35-VAV 1.0

2C35-VAV 3C35-VAV
1. Introduction
1.1. Use
1.2. Hardware features
1.3. Software features
1.4. Applications
1.5. Type Summary & Ordering Info
2. Before use or installation
3. Device Overview
4. Mounting Diagram
5. Mounting Instructions
6. First Power Up and Commissioning
6.1. Temperature measurement
6.2. Relative humidity measurement
6.3. Carbon dioxide (CO2) measurement
7. Touch screen operation and Maintenance
8. Definitions
9. User Interface
9.1. Home Screen Overview
9.2. Navigation buttons
10. Working and operating modes
10.1. Comfort mode
10.2. Economy mode
10.3. Standby mode
10.4. Scheduler
10.5. Occupied mode
11. Main menu and settings
11.1. Home > Menu
11.2. Scheduler
11.3. Setpoints
11.4. Display
11.5. Date and Time settings
11.6. Heating / Cooling (Manual Changeover)
11.7. Sound On / Off
11.8. About
12. Advanced Menu
12.1. Network
12.2. Security
12.3. Parameters [1 / 5] Main Configuration
12.4. Parameters [2…5 / 5] Air volume, VAV Temperature PID and ECM
12.5. Offsets
12.6. Setpoint Limits
12.7. Language
13. Input/Output Menu
13.1. Analog input (AI1)
13.2. Binary input (BIN1)
13.3. Sensor Function
13.4. Temperature sensor
13.5. Values
14. Variable Air Volume applications using C35-VAV
15. Connection terminals
16. Connection diagrams
17. BACnet MS/TP network recommendations
17.1. Wiring and topology
17.2. Termination jumper
17.3. Maximum number of devices on data bus
17.4. Isolated RS485
18. Technical data C35
19. Trouble shooting guide
20. Device Reset
21. Factory reset
22. Calibration of resistive touchscreen
23. BACnet Protocol Implementation Conformance Statement
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4C35-VAV 5C35-VAV
1. Introduction
Thank you for purchasing a KOER product. KOER is a brand dedicated to the development and
production of the next generation of hardware and software solutions for HVAC management
and building automation systems. Our vision is to continuously develop and produce quality
products for the building automation industry which will have a positive impact on user
environments, quality of life and, health and safety. With this in mind, we value any insights or
feedback you may have regarding our products. (Email: [e-mail])
1.1. Use
This device (C35-VAV…) can be used for temperature, air quality and humidity control of
individual zones as part of a Demand Controlled Ventilation system, HVAC system or as a
standalone controller.
C35-VAV… can be used in HVAC systems for:
• Heating
• Cooling
• Ventilation
• Dehumidification
C35-VAV… can control of the following operational elements:
• Damper actuators
• Heat exchange actuators
• Radiator/Floor heating actuator
• Modulating electric heaters
• EC motor fan
1.2. Hardware features
Main hardware features include:
• Resistive Color TFT touchscreen display
• Built-in sensors:
- Temperature
- CO2 (optional)
- Relative Humidity (optional)
• Three analog 0…10 V DC outputs
• One analog 0…10 V DC input
• One analog resistive input
• One binary input
• RS-485 transceiver (optional)
• Galvanic isolated RS-485 transceiver (optional)
• Real Time Clock
• Easy wall mounting
• Power supply 24 V AC/DC
1.3. Software features
• PID control based on temperature, air quality and humidity parameters
• Weekly scheduler, four preset modes, up to eight scheduler timers per day
• Occupied mode function
• Three operating modes: Comfort, Economy, Standby
• Protection functionality in Standby mode
• Password protected menu and advanced menu
• Window contact or presence sensor input
• Automatic or manual changeover
• Standby, Dim and Night Mode display brightness
• Easily configurable commissioning and working parameters
• Setpoint limitations for users
• BACnet MS/TP communication protocol (optional)
• Internal Temperature Compensation Algorithm
• Factory Reset function
1.4. Applications
The C35-VAV… was designed for the following VAV applications:
• Single duct
• Single duct with electric heater
• Single duct and radiator
• Single duct with heating and/or cooling coil
Pressure independent VAV applications:
• Single duct with serial fan
• Single duct with parallel fan
• Single duct with serial fan and heating or cooling coil
• Single duct with parallel fan and heating or cooling coil
1.5. Type Summary & Ordering Info
Product
Summary
Inputs Outputs Built in Sensors Protocol Network Interface Enclosure color
0-10V Pt1000 Binary 3x0-10V Temp. Humidity CO2BACnet RS485 Isolated
rs-485
White Black
Option
Codes
-H -C -B /RS /RS-G -BLK
C35-VAV √ √ √ √ √ O O O O O √ O
√ - Available
O - Option
Ordering Code E.g. C35-VAV-C-B/RS-G
Naming
Convention
1) Device 2) Application 3) Options 4) Network Interface 5) Enclosure color
C35 VAV C = CO2 sensor Isolated RS485 White
2. Before use or installation
It is strongly recommended that installation is performed by a qualified professional and
that this user manual is read carefully prior to installation. Incorrect installation may result
in malfunction, damaging the device or incorrect configuration. Please ensure you have the
correct user manual for the firmware version as shown on the ‘About’ screen (see page 20).
This manual was specifically written for Firmware Version C35-VAV 1.0.

6C35-VAV 7C35-VAV
4. Mounting Diagram
Great care should be taken when mounting C35-VAV... to any surface. The unit has been
designed to allow it to be connected or disconnected from the wall mount quickly and easily
(Figure 5.3 on Page 9). Please ensure the unit is only connected to the wall mount once all
construction has been completed and the surrounding environment is safe.
Ideal mounting conditions include inside facing walls which are in an open and central location
of the unit’s area of operation.
Warning: In order to ensure accurate readings and correct operation, the unit should not be
mounted in the following areas:
• In direct sunlight
• Closed spaces, for example, bookshelves or draws.
• Behind doors or curtains
• On sun facing walls
• Areas where the unit could be exposed to water or condensation
(e.g. shower rooms or bathrooms)
See page 8 for mounting and page 31 for wiring instructions.
3. Device Overview
Figure 3.1.
130 cm
min.
20 cm
Figure 4.1.
Suitable mounting
locations

8C35-VAV 9C35-VAV
5. Mounting Instructions
Component Listing:
Component Description Quantity
1 Codis 35 1
2Wall mount bracket 1
3Screws 4
4Wall plug / screw anchor 2
Inspect your package to ensure all components are present and that the connection terminals meet the
required specifications shown below. See Section 4 (page 7) for appropriate mounting locations.
Warning: Disconnect the power supply prior to commencing installation of the wall mount or
any wiring.
1. Place the wall mount on the conduit box (ø 60.3mm) and insert two screws which are provided.
NOTE: Alternate screws with the parameters shown above (right) can be used.
2. Connect the wires from the conduit box wall mount terminals using the relevant wiring
diagram on page 31.
Connection terminal
wire specifications
Single stranded wire 0.2 … 1.5 mm2
Fine stranded wire 0.2 … 1 mm2
Captive screw M2
Screwdriver mm
Figure 5.1.
Figure 5.2.
IMPORTANT: Before proceeding to the next step, verify all connections are in the correct
terminals and that the correct voltage is being provided.
3. Attach C35-VAV… to the wall mount by sliding the unit onto the mounting brackets as
shown in the diagrams below. The unit will click into position. Turn on the power supply
and the unit will automatically turn on.
4. To remove or detach device from the wall mount, press the release bracket on the
bottom of the device and then pull the device upwards.
Warning: Ensure that the power supply has been switched prior to removing the device from
the wall mount.
Figure 5.3.
Figure 5.4.
CODIS35v4.4
WEIGHT:
A4
SHEET 1 OF 1
SCALE:1:5
DWG NO.
TITLE:
REVISION
DO NOT SCALE DRAWING
MATERIAL:
DATE
SIGNATURE
NAME
DEBUR AND
BREAK SHARP
EDGES
FINISH:
UNLESS OTHERWISE SPECIFIED:
DIMENSIONS ARE IN MILLIMETERS
SURFACE FINISH:
TOLERANCES:
LINEAR:
ANGULAR:
Q.A
MFG
APPV'D
CHK'D
DRAWN
A
DETAIL A
SCALE 2 : 1
CODIS35v4.4
WEIGHT:
A4
SHEET 1 OF 1
SCALE:1:5
DWG NO.
TITLE:
REVISION
DO NOT SCALE DRAWING
MATERIAL:
DATE
SIGNATURE
NAME
DEBUR AND
BREAK SHARP
EDGES
FINISH:
UNLESS OTHERWISE SPECIFIED:
DIMENSIONS ARE IN MILLIMETERS
SURFACE FINISH:
TOLERANCES:
LINEAR:
ANGULAR:
Q.A
MFG
APPV'D
CHK'D
DRAWN

10 C35-VAV 11C35-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 (CO2) measurement
The C35-VAV-C… uses Non-dispersive Infrared (NDIR) CO2 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 CO2 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
CO2Carbon 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,
CO2 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

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10. Working and operating modes
Working and operating modes are switched sequentially by selecting the button on the
home screen:
There are two main working modes (Manual Control and Scheduler) and three operating modes
(Comfort, Economy and Standby). The device’s working and operating modes are shown on the
home screen to notify users of the devices current status.
9. User Interface
9.1. Home Screen Overview
9.2. Navigation buttons
Below are the standard navigation buttons which appear on most settings screens.
1
2
3
6.1. 6.2. 6.3. 6.4.
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12 11 10
8
1 2 3 4 1
1. Back and Next: Each screen will offer a “Back” or “Next” button. These can be used to
navigate menus with more than one screen.
2. Home: Pressing the “Home” button will take you directly to the home screen.
3. Previous Screen: Each screen will offer a “Previous” or button. This will take you to the
previous main menu selection.
4. Save: Once a parameter value has been adjusted or modified in the parameter screen, a
“Save” button will appear allowing users to save their changes. If the “Save” button is not
selected prior to changing screens, any changes will not be saved and the original values
will be retained.
1. Current operating mode (Comfort, Economy, Standby)
2. Current working mode (Manual, Scheduler) or bypass status (Windows Open, Occupied
mode timer)
3. Current CO2 level (ppm) for devices with built in CO2 sensors or if external sensor is
connected
4. Operating and working mode change
5. Increase or decrease setpoints
6. Select which setpoint to adjust in Comfort mode or activate/deactivate Occupied mode in
Economy and Standby modes:
6.1. Temperature (°C)
6.2. CO2 (ppm)
6.3. Relative humidity (% rh)
6.4. Occupied mode button
7. Menu button
8. Current relative humidity (% rh) (optional)
9. Current temperature (°C) as measured by internal sensor or remote sensor
10. Indicates Heating mode is active
11. Indicates Cooling mode is active
12. Indicates Occupied mode is active
13. Date and time
5 6 5 74
Comfort mode
Manual control
Economy mode
Manual control
Comfort / Economy / Standby mode
Following scheduler
Standby mode
Manual control
13

14 C35-VAV 15C35-VAV
This mode prioritises lower
energy consumption and it is
recommended that Economy
mode is only activated
when the controlled zone is
unoccupied.
Depending on the setpoint
range, Economy mode can
significantly decrease HVAC
energy consumption and
operating costs.
Economy mode can be
activated manually using the
button, by the scheduler
or by presence sensor.
Users will not be able to
adjust any setpoints from the
Homescreen unless Occupied
mode is activated from the
homescreen.
The setpoints for economy
mode can be adjusted in the
setpoints menu.
10.2. Economy mode10.1. Comfort mode
This mode prioritises
user comfort and it is
recommended that Comfort
mode is activated only
when the controlled zone is
occupied.
Comfort mode can be
activated manually or by
the scheduler and, in short
term applications, with the
Occupied button .
In this mode, users are able
to adjust setpoints on the
homescreen and in the
setpoints menu.
Changes on the homescreen
will be saved automatically in
the setpoints menu.
A. Comroft mode with manual control A. Economy mode with manual control
B. Comfort mode activated by scheduler B. Economy mode activated by scheduler
C. Economy mode activated by presence sensorC. Comoft mode activated through Ocupied mode function

16 C35-VAV 17C35-VAV
10.3. Standby mode
This mode is meant to be
used for zones which are
unoccupied for extended
periods of time.
Standby mode effectively
turns off the HVAC system
unless the system detects a
value below (5-10°c) or above
(45°c). If C35-VAV... detects
that a set point is exceeded,
the HVAC system will be
activated to protect the
controlled environment and
to ensure the temperature,
CO2 or relative humidity
remains within the desired
setpoint range.
Similarly to Economy mode,
users will not be able to
adjust any setpoints from the
Homescreen unless Occupied
mode is activated (see
below).
Standby mode can be
activated manually using
the button or with the
Scheduler. Standby mode
will be activated if a window
contact switch is connected
and a Window is open
(optional).
NOTE: In Standby mode the
display will be turned off
after 5 minutes
A. Standby mode with manual control
B. Standby mode activated by scheduler
C. Standby mode activated by Window contact (if enabled in
parameters)
10.4. Scheduler
The week long scheduler allows users to set up to four presets for the week where the working
modes start and end at specific times. The device will automatically manage the HVAC system
to regulate temperature within the specific setpoints for each scheduled working mode
(Comfort, Economy and Standby). See page 17 for Scheduler setup.
10.5. Occupied mode
Occupied mode can override Economy or Standby mode to bring the controlled environment to
a comfortable setting with the single touch of the Occupied button on the home screen.
In these modes, the Occupied button will appear at the bottom of the home screen. When
Occupied mode is activated, the system will operate in Comfort mode and a countdown timer
will appear on the home screen. The default Occupied timer is set to 1 hour. The duration can
be adjusted in the Parameters menu (see page 22). Users will be able to adjust the comfort set
points ±3°c from the standard value for the duration of the override. By pressing the Occupied
button again Occupied mode will be deactivate and it will return to previous operating mode.
11. Main menu and settings
Select the button on the
home screen to enter the
Settings menu, shown right.
11.1. Home > Menu
11.2. Scheduler
Select the on Menu
screen. The Scheduler screen
will show the unit’s week
long schedule. Pressing
the button below each
corresponding day will cycle
through the desired daily
profiles (Workday, Weekend,
Holiday and Custom). Press
the button to save the
changes.

18 C35-VAV 19C35-VAV
Step by step instructions:
1. Click the button to create new timer.
2. Touch the timetable legend or timer array to select the desired working mode (Comfort,
Economy, Standby).
3. Using the +/- buttons, adjust the start time of the operating mode.
4. Repeat this process for each entry until the whole day has been configured.
5. To edit specific enties, select the entry on the timetable on the 24 hour timetable or by
pressing the button.
6. Press the button to delete entries in the timetable.
7. Once all the required entries have been made, press “Save” to save the changes to the daily profile.
The setpoints for heating,
cooling, air quality and
relative humidity can be
adjusted in the Setpoint
menu for each operating
mode (Comfort, Economy,
and Standby).
These setpoints will be used
by the scheduler or when a
mode is manually activated.
To adjust the setpoints for
each operating mode, enter
the relevant screen and
increase or decrease the
desired setpoints using the
+/- buttons. (The setpoints
for comfort mode can also be
adjusted using the increase/
decrease buttons on the
home screen). Once the
required adjustments have
been made, select to
save your changes.
11.3. Setpoints
Configuring Daily Scedules
Once the week long schedule
has been set, the daily
profiles can be input by
pressing one of four preset
profiles: Workday, Weekend,
Custom, Holiday.
A 0-24 hour timetable will
appear (Figure 11.3).
Select the button on
Menu screen to enter the
Date / Time Menu. Select
the EDIT from the options
to change the time, date or
format. Once the correct time
and date has been set using
the time buttons
-/+, press the button to
save the changes.
11.5. Date and Time settings
Select the button on
Menu screen to enter the
Display Menu.
Brightness: Select EDIT from
the options to change the
display brightness (%).
Turn Off Display: Select EDIT
from the options to enable
the screen to turn off after 5,
15, 30 minutes or never.
Dim Display: Select EDIT from
the options to enable the
screen to dim brighntes after
5, 15, 30 minutes or never.
Night Mode: Night mode
aims to reduce eye strain
in dark settings. If enabled,
screen brightness will
decreased to minimal level
between the start and stop
time. Enable or disable Night
Mode, using the On/Off
button. The timer can be set
by using the +/- buttons.
Press the button to save
any changes.
11.4. Display

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Note: For all other control sequence options, this button will be disabled and it will only serve
as indicator for heating , cooling or ventilation mode.
Once the desired setting has been selected, press the button to save the changes.
Manual changover from
heating to colling and
vice versa can be done by
presing the Heating or
Cooling button on
the Menu screen. Manual
changover is only posible
when “Cooling or heating” is
selected as Control seqence
in Parameters (see page 22)
and when Sensor function in
In/Out menu is not defined
as Changover (see page 26).
Select the (sound on) or (sound off) button on Menu screen to turn the unit’s keytone
speaker on or off. Press the button to save any changes.
Enter the About menu to see
firmware version.
11.6. Heating / Cooling (Manual Changeover)
11.7. Sound On / Off
11.8. About
MS/TP MAC: The unique MAC address which can have a value between 0-127 on the local
MS/TP data bus.
Max Master: The highest MAC address used by BACnet devices in the local MS/TP databus
(limited to 127). For optimal network performance, limit the Max Master value to the total
number of devices on the data bus.
Max Info Frames: The maxium number of requests a device is able to send over the local
network. For optimal network performance, this value should be set to 1.
Baud Rate: The baud rate setting determines the rate at which data is sent on the data bus.
The maximum value will be determined or limited by the quality of cabling between the two
furthest devices on the network.
Note: All devices must be set on the same baud rate. The available options are:
• 9600
• 19200
• 38400
• 57600
• 76800 (Default Value)
Once the desired settings have been selected, press the button to save any changes.
12.1. Network
Enter the advanced settings
menu. Select the “Parameter”
button to enter the specific
parameters of the system
onto the device.
Note: You will be prompted
for a pass code prior to
entering the advanced
menu. Enter the passcode
to proceed to the advanced
menu. Note: The default
password is “0000”.
12. Advanced Menu
NOTE: BACnet and network
settings should be configured
by qualified profesionals
Device name: The device
name that will be used on
the BACnet network.
Device ID: A unique BACnet
device number which can
have a value between 0 to
HEX 3FFFFF that will be used
for device’s identification
on the different network
protocols within the BACnet
network.

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To set a lock password to
limit access to the unit’s
home screen, select the
button on the home screen
to enter the Settings menu.
Select “Advanced” and then
“Security”.
To activate a user password
on the home screen press the
“Lock Home Screen” button
so that its status is “ON”.
Select the “User password”
button from the options
screen and then input a
password using the keypad.
Once a 4 digit password
has been set, press the “OK”
button.
Return to Home screen:
When this function is
enabled, the device will
return to the home screen
automatically from any menu
screen after 1 minute of
inactivity.
Note: The default Admin
password (0000) can be
used to bypass the user
password.
12.2. Security
12.3.4. Dehumidification
12.3.5. Occupied Mode
Timer
12.3.2. Cooling / Heating
Coil
12.3.3. Fan Operating Mode
If there are optional heat exchangers or modulating electric heaters, it is necessary to enable
the analog output signal for the valve(s) through the “Cooling / Heating Coil” parameter.
A fan can be placed in series or in parallel with a VAV box. The “Fan operating mode” parameter is
off by default. The parameter can be set to “Series” or “Parallel” depending on the configuration.
Series: If the fan is configured in series, the VAV damper actuator and fan are controlled
according to temperature or air quality demand. The fan maximum and minimum speed can be
adjusted in Parameters [5 / 5] Fan AQ PID and ECM voltage).
Parallel without heat exchanger: If the fan is configured in parallel, then the fan is used to
recirculate warmer ceiling air. The parallel fan operates only when Heating is active and according
to the ambient temperature (the lower the ambient temperature, the higher the fan speed).
Parallel with heat exchanger: VAV damper actuator will be controlled according to air quality
demand. The fan and heat exchange valve will be controlled according to room air temperature.
C35-VAV... can be configured to dehumidify a controlled zone with the dehumidification
parameter. The options are:
Enabled - The following system configuration is required to enable dehumidification:
• Control sequence is set to “Cooling” or “Cooling and Heating”.
• “Cooling / Heating coil” parameter is enabled.
• The unit or system has a built in relative humidity sensor. (optional)
While operating in cooling mode, the valve of the heat exchanger will control relative humidity
in line with each working modes humidity setpoints. (See page 18, Setpoints).
Disabled - Dehumidification will be disabled. Select to save your changes.
The default duration for the occupancy timer is 60 minutes. To adjust the occupancy timer
duration, enter screen 01/05 of the parameters menu and increase or decrease the number of
minutes using the +/- buttons. Select to save your changes.
12.3.1. Control Sequence
12.3. Parameters [1 / 5] Main Configuration 12.4. Parameters [2…5 / 5] VAV voltage, VAV PID and ECM parameters
12.4.1. VAV voltage output To change analog output
(AO1) voltage range from
0-10 V to 2 – 10 V and vice
versa press the VAV voltage
output button. Select to
save your changes.
The control sequence defines whether the controlled system is capable of heating, cooling
or ventilating the zone. Select the desired control sequence by pressing the button next to
“Control sequence“. The options are:
• Heating only
• Cooling only
• Cooling or heating
• Cooling and heating
• Ventilation

24 C35-VAV 25C35-VAV
12.4.2. Parameters
[2..5 / 5] PID settings
and ECM
The Proportional-Integral-
Derivative controller (PID
controller) calculates a
difference between measured
values and set points. The
PID controller minimizes the
difference between those
values by adjusting openness
of the valves, damper
actuator or fan speed. Adjust
PID gains according to each
project’s specifications. The
default values may not be
suitable for all applications.
Tuning a PID controller
involves setting values of
Proportional gain (Kp),
Integral gain (Ki) or Derivative
gain (Kd) parameter values.
If two-term (PI) or one-term
(P) control is needed adjust
unnecessary values to zero.
The C35-VAV… uses 6 PID
controls. The PID controller
parameters can be adjusted
for the following functions:
• VAV temperature [2/5]
• VAV Air quality [3/5]
• Valve [3/5]
• Dehumidification [4/5]
• Fan Temperature [4/5]
• Fan Air Quality [5/5]
Adjustments can be made
using the +/- buttons. Once
the required adjustments
have been made, select
on each screen to save your
changes.
The analog output signal for the EC motor can be configured with three parameters:
• “ECM Min Off voltage”: If this value is different from zero volts, adjust the ECM OFF voltage
to value that will turn off the ECM fan.
• “ECM MIN voltage”: Defines the minimum signal value and the minimum speed of the fan
(5 %).
• “ECM MAX voltage”: Defines the maximum signal value and the maximum speed of the
fan (100 %).
Adjustments can be made using the +/- buttons. Once the required adjustments have been
made, select to save your changes.
The C35-VAV… can be
calibrated by adjusting the
offset values on the device.
Adjust offset values for
each sensor using the +/-
buttons.
Select to save
your changes. Once the
button has been pressed, the
temperature will be updated
to reflect the input of the
offset value.
12.5. Offsets
NOTE: Ensure all sensors have had sufficient time to power up and stabilize prior to entering
offset values. For more information see, “First Power Up an Commissioning”
Setpoint limits are defined in
the “SP limits” menu. Limits
can be set for temperature,
air quality, and relative
humidity in heating and
cooling control modes and
for all operating modes. Once
setpoint limits have been
defined, users will not be able
to adjust setpoints outside
the defined limits.
Adjust the limits for each
setpoint on screens 1 to 4
using the +/- buttons.
Select to save your
changes.
Select the “Language” button
on Advanced menu screen.
Select the desired language
from the available options
and then press the “Save”
button to save the changes.
12.6. Setpoint Limits
12.7. Language

26 C35-VAV 27C35-VAV
The AI1 analog input
parameter allows the
following sensors to be
connected and enabled
in In/Out menu:
• VAV actuator position
signal
• Remote CO2 sensor
• Disabled (default)
Select to save your
changes.
13. Input/Output Menu
13.1. Analog input (AI1)
The remote sensor can be activated by selecting “Remote sensor” from the available ‘Sensor
function’ parameter options. Once selected, the Remote sensor parameter will appear. Select
to save your changes.
The Floor heating sensor function requires floor temperature sensor to be connected and
enabled in settings. Enable floor sensor by selecting Floor sensor from the available “Sensor
function” parameter options. Select to save your changes.
Max Floor Temperature: If the floor sensor parameter is enabled, a “Max floor temperature”
parameter will appear at the bottom of In/Out screen 1/2. Adjust maximum floor temperature
by using the +/- buttons. Select to save your changes.
13.4. Temperature sensor
Users can define how temperature readings will be displayed by pressing the button next to
“Temperature Sensor“. The options are:
• Internal: The temperature as measured by the device’s inbuilt sensor.
• Remote: If a remote sensor is connected, the temperature as measured by the remote
sensor.
• Min, Max, Average: If a remote sensor is connected, the measured temperature can be a
calculated using minimum, maximum or average reading of the two sensors.
Select to save your changes.
13.3.3. Floor sensor
13.2. Binary input (BIN1)
If a window contact swich or presence sensor is connected to binary input (BIN1) change Binary
input parameter from “Disabled” to “Window contact” or “Presence sensor”.
If the “Window contact” parameter is selected and window’s contact switch is triggered by an
open window, then the system will go into standby mode to save energy. The operating status
on the home screen will state “Standby - Window is Open” to notify users. Once the window
has been closed, the system will resume normal operation.
If the “Presence sensor” parameter is selected and presence sensor is not detecting any
presence the system will go from “Comfortable mode” to “Economy mode”. The operating status
on home screen will state “Economy mode – No presence detected”. Once the presence is
detected the system will resume to “Comfortable mode”.
The contact polarity can be reversed by selecting the Binary input polarity “Normally open” or
“Normally closed”.
Select to save your changes.
13.3. Sensor Function
The analog RTD sensor (PT1000) parameter has the following available options if the sensor is
connected to the device’s RTD input:
• Disabled (Default value, an external sensor is connected but has not been enabled)
• Changeover sensor
• Remote sensor (Temperature only)
• Floor sensor
If a sensor is not connected or a sensor with different resistance to that of a PT1000 is
connected, a message “Not connected” will be shown instead.
A changeover sensor allows the system to automatically switch between heating and cooling
mode (or vice versa) using the “Sensor function” parameter on Screen 1/2 of the Input / Output
menu. If the sensor function parameter is set to “Changeover”, the device will automatically
change from heating or cooling as required. Changeover will be determined by the temperature
in the duct or pipe. If the temperature in the duct or pipe is above 28°C the control mode will
change to heating or if the temperature is below 18°C the control mode will be changed to
cooling. Select to save your changes.
13.3.1. Change Over
13.3.2. Remote sensor
13.5. Values
Screen [2 / 2] of the
In/Out menu summarizes
all of the values and states
of the device’s inputs and
outputs. These values are
refreshed every second.
14.1. VAV systems without ECM fan
14. Variable Air Volume applications using C35-VAV
D - Damper actuator 0 - 10 V
T1 - Remote temperature sensor Pt1000
Q1 - Remote air quality sensor 0 – 10 V
Main configuration
Control sequence: Heating only
Cooling only
Cooling or heating
Ventilation
Cooling/heating coil: Disabled
Fan operating mode: Off
Dehumidification: Disabled
14.1.1. Single duct

28 C35-VAV 29C35-VAV
D - Damper actuator 0 - 10 V
T1 - Remote temperature sensor Pt1000
E1 - Modulating electric heater 0 – 10 V
Q1 - Remote air quality sensor 0 – 10 V
Main configuration
Control sequence: Heating only
Cooling and heating
Cooling/heating coil: Enabled
Fan operating mode: Off
Dehumidification: Disabled
D - Damper actuator 0 – 10 V
V1 - Valve actuator 0 – 10 V
T1 - Changeover sensor or remote temperature sensor Pt1000
Q1 - Remote air quality sensor 0 – 10 V
Main configuration
Control sequence: Heating only
Cooling only
Cooling or heating
Cooling/heating coil: Enabled
Fan operating mode: Off
Dehumidification: Disabled
Enabled (if cooling)
D - Damper actuator 0 – 10 V
V1 - Valve actuator 0 – 10 V (heating)
V2 - Valve actuator 0 – 10 V (cooling)
T1 - Remote temperature sensor Pt1000
Q1 - Remote air quality sensor 0 – 10 V
(0 – 2000ppm)
Main configuration
Control sequence: Cooling and heating
Cooling/heating coil: Enabled
Fan operating mode: Off
Dehumidification: Disabled
Enabled
D - Damper actuator 0 – 10 V
V1 - Valve actuator 0 – 10 V
T1 - Remote temperature sensor Pt1000
Q1 - Remote air quality sensor 0 – 10 V
(0 – 2000ppm)
Main configuration
Control sequence: Heating only
Cooling and heating
Cooling/heating coil: Enabled
Fan operating mode: Off
Dehumidification: Disabled
14.1.2. Single duct with
electric heater
D - Damper actuator 0 – 10 V
V1 - Valve actuator 0 – 10 V
T1 - Floor temperature sensor Pt1000
Q1 - Remote air quality sensor 0 – 10 V
(0 – 2000ppm)
Main configuration
Control sequence: Heating only
Cooling and heating
Cooling/heating coil: Enabled
Fan operating mode: Off
Dehumidification: Disabled
14.1.3. Single duct with
heating or cooling coil
14.1.4. Single duct with
heating and cooling coils
14.1.6. Single duct with
floor heating
14.2. VAV systems with ECM Fan
D - Damper actuator 0 – 10 V
M1 - ECM Fan 0 – 10V
T1 - Remote temperature sensor Pt1000
Q1 - Remote air quality sensor 0 – 10V (0 – 2000ppm)
Main configuration
Control sequence: Heating only
Cooling only
Cooling or heating
Ventilation
Cooling/heating coil: Disabled
Fan operating mode: Serial
Dehumidification: Disabled
D - Damper actuator 0 – 10 V
M1 - ECM Fan 0 – 10V
T1 - Remote temperature sensor Pt1000
Q1 - Remote air quality sensor 0 – 10V (0 – 2000ppm)
Main configuration
Control sequence: Heating only
Cooling only
Cooling or heating
Ventilation
Cooling/heating coil: Disabled
Fan operating mode: Parallel
D - Damper actuator 0 – 10 V
M1 - ECM Fan 0 – 10 V
V1 - Valve actuator 0 – 10 V
T1 - Remote temperature or change over sensor Pt1000
Q1 - Remote air quality sensor 0 – 10 V (0 – 2000ppm)
Main configuration
Control sequence: Heating only
Cooling only
Cooling or heating
Ventilation
Cooling/heating coil: Enabled
Fan operating mode: Serial
Dehumidification: Disabled
Enabled (if cooling)
14.2.1. Single duct with
serial fan
14.2.2. Single duct with
parallel fan
14.1.5. Single duct with
radiator heating
14.2.3. Single duct with
serial fan and heating or
cooling coil

30 C35-VAV 31C35-VAV
D - Damper actuator 0 – 10 V
M1 - ECM Fan 0 – 10 V
V1 - Valve actuator 0 – 10 V
T1 - Remote temperature or change over sensor Pt1000
Q1 - Remote air quality sensor 0 – 10 V (0 – 2000ppm)
Main configuration
Control sequence: Heating only
Cooling only
Cooling or heating
Cooling/heating coil: Enabled
Fan operating mode: Serial
Dehumidification: Disabled
Enabled (if cooling)
14.2.4. Single duct with
parallel fan and heating or
cooling coil
15. Connection terminals
Figure 15.1.
16. Connection diagrams
C35-VAV and VAV damper actuator
D1 - Zone controller C35-VAV…
V1 - Damper actuator with feedback signal
S1 - Switch for window contact or
presence sensor
T1 - Changover or remote RTD sensor (Pt1000)
C35-VAV with VAV damper actuator
and auxiliary electric heater
D1 - Zone controller C35-VAV…
V1 - Damper actuator
E1 - Modulating electric heater (DC 0...10V)
S1 - Switch for window contact or
presence sensor
Q1 - Remote air quality sensor (DC 0...10V)
T1 - Changover or remote RTD sensor (Pt1000)
C35-VAV with VAV damper actuator
and heating and cooling coils
D1 - Zone controller C35-VAV…
V1 - Damper actuator with feedback signal
V2 - Valve actuator (DC 0...10V) - heating
V3 - Valve actuator (DC 0...10V) - cooling
S1 - Switch for window contact or
presence sensor
C1 - BACnet MS/TP bus connection
C35-VAV with VAV damper actuator, heating
or cooling coil and ECM fan
D1 - Zone controller C35-VAV…
V1 - Damper actuator with feedback signal
V2 - Valve actuator (DC 0...10V) -
heating/cooling
M1 - EC motor fan
S1 - Switch for window contact or
presence sensor
C1 - BACnet MS/TP bus connection
F 6A
F 6A
F 6A
F 6A
C35-VAV
G0 Power supply voltage ground
G Power supply voltage 24 V AC
D- RS485 data –
D+ RS485 data +
SC RS485 isolated ground or cable shield connection
AI Analog input 1 DC 0-10V (1mA)
M
(Pin 1)
(Pin 2)
(Pin 3)
(Pin 4)
(Pin 5)
(Pin 6)
(Pin 7) Analog input 1 ground reference
RTD (Pin 8,9) Analog input for RTD room temperature sensor, changeover sensor or floor sensor (Pt1000)
BIN (Pin 16, 17) Input for potential-free switch (window, presence sensor or dew point sensor)
AO1 (Pin 15) Analog output 1, DC 0-10V (1mA) for damper actuator
M1 (Pin 14) Ground reference for analog output 1
AO2 (Pin 13) Analog output 2, DC 0-10V (1mA) for valve actuator (heating/cooling for 2-pipe systems;
heating for 4-pipe system) or auxiliary modulating electric heater
M2 (Pin 12) Ground reference for analog output 2
AO3 (Pin 11) Analog output 3, DC 0-10V (1mA) for valve actuator (cooling, 4-pipe systems) or ECM fan
(pressure independent systems)
M3 (Pin 10) Ground reference for analog output 3

32 C35-VAV 33C35-VAV
17.2. Termination jumper
Position of the termination jumper is shown in the figure below. The termination jumper should
be connected on the first and last device on data bus segment. When the jumper is connected
termination is enabled and a 120Ω resistor is connected between RS-485 nodes. When the
jumper is removed the termination of the cable is disabled.
17. BACnet MS/TP network recommendations
17.1. Wiring and topology
BACnet wiring requirements
• Use Shielded Twisted Pair cable (0.2 mm2).
• Maximum cable length for a data bus segment must not exceed 1200 m.
• Only a daisy-chained data bus topology as shown in drawing is acceptable.
• Connect cable shields together. Connect cable shield to the Protective Earth (PE) at one
point only.
• Connect termination jumper on the first and last device on the data bus (see below).
• Maintain same polarity between devices on a single power supply.
17.3. Maximum number of devices on data bus
The C35-VAV-…-B/RS is categorized as BACnet MS/TP Master device. The maximum
number of Master devices supported by BACnet MS/TP on one data bus segment is 128.
However, it is recommended that no more than 50 devices are connected to one data
bus segment. A BACnet router device should be used for projects where more data bus
segments need to be connected, shown below.
17.4. Isolated RS485
Devices with RS-485 with galvanic isolation are marked with suffix /RS-G. Galvanic
isolation is required if there is no guarantee that the potentials at the earth grounds
of different nodes in the system are within the common-mode range of the receiver.
The benefits of galvanic isolation extend beyond safety and protection from dangerous
voltages. They also provide error-free communication in the presence of high edge rate
transients, noise and high common mode voltage that would otherwise render a non-
isolated network inoperative.

34 C35-VAV 35C35-VAV
18. Technical data C35
Power supply Nominal voltage SELV 24 V AC /DC
Consumption 2.1 W
Analog Inputs Voltage inputs 0 … 10 V DC (max 1 mA)
Resolution 10 mV
Accuracy ± 0.9 % (full scale)
Resistive input (PT1000) 803 … 1480 Ω (-50 … 125 °C)
Resolution 0.385 Ω (0.1 °C)
Accuracy ± 1.54 Ω (± 0.5 °C)
Binary Input Voltage free contact Selectable (NO/NC)
Analog Outputs Voltage outputs 0 … 10 V DC (1 mA)
Resolution 10 mV
Accuracy ± 1.54 Ω (± 0.5 °C)
Temperature sensor Type Silicon Band gap
Resolution 0.0625 °C
Accuracy ± 0.5 °C (max) - 20 °C to
+ 100 °C
Humidity sensor Type Capacitive
Range 0-100 % rH from -40 °C
to 75 °C
Accuracy ± 2% at 25°C
CO2 sensor Sensing method NDIR
Measuring range 400 … 10,000 ppm
Accuracy ± 50 ppm ± 3 %
of measured value
Step response time (90%) 3 minutes
Sampling intervals 5 seconds
Warming-up time 3 minutes
Calibration time 7 Days
Display Type Graphical TFT LCD
Touchscreen type Resistive / single touch
Size 3.5 inch (diagonal)
Resolution 320 x 240 pixel
Color depth 16 bit
Real time clock Battery ON time Rechargeable
RS485 Bitrate 250 kbps (up to 2000 m)
Isolation Galvanic (optional)
Termination 120 Ω (jumper selectable)
Wi-Fi Protocol 802.11 b/g
Bitrate 1 – 54 Mbit/s
Frequency 2.4 GHz ISM band
Security WEP / WPA / WPA2
Connection terminals Single stranded wire 0.2 … 1.5 mm2
Fine stranded wire 0.2 … 1 mm2
Captive screw M2
Screwdriver Flat-bladed 0.5 x 2.5 mm
Degree of protection Enclosure IP20
Against electric shock class III
Ambient temperatures Operation + 5 °C to + 40 °C
Transport and storage - 20 °C to + 65 °C
Weight With package/without
package
180 g / 150 g (max)
Dimensions (mm)

36 C35-VAV 37C35-VAV
Dimensions (mm)
Directives
conformity
EMC directive 2004/180/EC
Low voltage directive
2006/95/EC
RoHS 2011/65/EU (RoHS 2)
Standards Automatic electrical controls
for household and similar use
EN60730-1
Electromagnetic
Compatibility (EMC)
Emission standard for
residential, commercial and
light industrial environments
EN 61000-6-3:2007
Immunity for industrial
environments
EN61000-6-2:2005
Disposal This device is classified as waste electronic equipment
under European Directive
2002/96/EC (WEEE) and may not be disposed of as
unsorted municipal waste.
Adhere to all relevant national laws.
19. Trouble shooting guide
Symptom Diagnostic Test Cause Solution
Home screen temperature
reading is incorrect.
Confirm room temperature
using a thermometer.
Codis has not had enough
time to power up and
stabilize.
After resetting the device,
wait 30 minutes prior to
adjusting parameters.
The device has not been
calibrated.
Calculate and input the tem-
perature offsets. See Page 25.
Unit has not been
mounted correctly resulting
in uncharacteristic
temperatures.
Remount device in a suitable
mounting location and follow
mounting instructions. See
page 7 and 8.
Incompatible remote sensor
has been connected.
Only use the PT1000 resistive
temperature sensor.
The device is not mounted
properly.
Ensure the device has clicked
into place on the wall mount.
See page 9.
CO2 sensor reading is
incorrect.
Compare measurements
against a reference
instrument.
Codis has not had enough time
to power up and stabilize.
Read chapter First start up
and Commissioning.
Relative humidity reading
is incorrect.
The device has not been
calibrated.
Calculate and input the
offsets. See Page 25.
Display is not ON or the
device appears to be OFF.
Touch the screen, the device
should awaken upon contact,
if not:
The connecting pins have
been damaged during
installation.
Ensure none of the connector
pins are bent. If required,
gently realign any bent pins.
The device is not mounted
properly.
Ensure the device has clicked
into place on the wall mount.
See page 9.
The device’s wiring has not
been installed correctly.
Install the device in line with
the wiring diagrams on page
31.
Display’s touch screen is not
responding to touch or it is
responding incorrectly.
Touch the screen to see if
there is a response.
A pressure has already been
applied on touchscreen
surface.
Check the perimeter of the
display and remove any dust
or dirt.
If the pressure has been
applied at one place but
the graphic response
is on other part of the
screen recalibration of the
touchscreen is required.
For recalibration of touch
screen please read chapter
Calibration of touch screen
on page 40.
Display brightness is low. Touch the screen to see if the
brightness will increase.
If brightness increases after
the display has been touched
the Dim display setting is
turned on.
Change “Dim” display settings
in Display menu. (page 19).
If brightness don’t increases
after the display has been
touched the Night mode
setting is turned on.
Change the “Night mode”
start and stop time or turn
off this option in the display
menu (page 19).

38 C35-VAV 39C35-VAV
Symptom Diagnostic Test Cause Solution
Scheduler is not working
properly
Set new timers and test the
scheduler. The home screen
should respond in line with
the set timetable.
Time and or Date have not
been set correctly.
Enter the correct date and
time in the Date Time menu.
(Page 19).
When device is following
scheduler it is always in
standby mode
The scheduler timer presets
have not been configured.
Enter new timers in
scheduler presets.
System is not heating or
cooling to the desired set
point.
Check the home screen
status bar to ensure the
correct control sequence icon:
(heating) or
(cooling), is present.
The unit is set to manual
changeover and is in the
incorrect control mode
Enter the Menu and press
the (heating) or
(cooling) button for manual
changeover.
Manual changeover can’t be
performed from the settings
menu.
Check if the (heating)
or (cooling) button is
unavailable (dimmed button).
Manual changeover is
disabled. Manual changeover
is only possible when Control
sequence is set to “Heating
or Cooling” and if Sensor
function in In/Out menu is
not set to “Changeover”.
Change the Sensor function
in In/Out menu or Control
sequence in Advanced
Parameters.
Sensor function in In/Out
menu can’t be changed.
Check if the message on the
button is “Not connected”.
If the PT1000 sensor is not
connected to RTD terminals
or if the resistance of
connected element is less
than 780Ω and more than
1500Ω then the Sensor
function parameter will be
unavailable.
Connect the correct RTD
sensor (PT1000) to RTD
terminals.
Setpoint buttons are not
shown on the Home screen.
Check if the device is in
Economy or Standby mode by
reading the status on screen.
Setpoints in these modes
can only be adjusted in the
setpoints menu.
Change the Operating mode
with button or bypass to
Comfort mode by activating
Occupied mode function with
button.
System is not heating or
cooling and only the Menu
button is shown on the
Home screen.
Check if “Window is open”
message is shown on the
display and if any window in
the room is open.
The device has detected that
a window is open .
Device will exit bypass mode
when the window is closed.
“Window is open” message is
shown on the display and all
windows are closed.
Close or open the window to
see if the device will change
operating mode.
Polarity of the window
contact is not correct.
Change the Window contact
polarity in In/Out menu.
The device does not
communicate over the
BACnet MS/TP network.
Inspect wires and wall
mounts for signs of damage.
Disconnected/broken/
damaged wire.
Repair or install new wiring
where necessary.
The device does not
communicate over the
BACnet MS/TP network.
Count the number of devices
on the network segment
The maximum number
of devices on a network
segment has been exceeded.
Install a BACnet router to
extend the BACnet data bus
network.
20. Device Reset
In the event C35-VAV becomes inoperative, the device can be reset using the manual
reset switch which is located on the bottom right hand corner of the device. Gently insert
a thin object into the opening. The device should reboot through the normal boot menu.
Note: Do not touch the display during the boot menu to avoid inadvertently performing a
factory reset.
Figure 20.1.
Symptom Diagnostic Test Cause Solution
The device does not
communicate over the
BACnet MS/TP network.
Check the device ID in the
network settings menu.
Two or more devices have the
same device ID .
Assign unique ID to every
device on network.
Check the MAC address in the
network settings menu.
Two or more devices have the
same MAC address.
Assign unique MAC address to
every device on data bus.
Check the Baud rate in the
network settings menu.
The correct baud rate has not
been configured.
Set the same baud rate to all
devices on data bus.
Check the connection
terminals on the wall mount.
BACnet data bus polarity has
been incorrectly connected .
Rewire the D+ and D- signal
wires to correct polarity.
Check the Max Master
parameter in the network
settings menu.
The Max Master parameter
has been incorrectly
configured.
Set the Max Master to
highest MAC address used on
data bus.
Measure the power supply
voltage on device terminals.
Incorrect voltage is being
supplied to the device.
Connect correct voltage to
device.
Check if cable termination
is enabled on first and last
device on the data bus.
Incorrect signal levels are
being received by the data
bus.
Enable termination by
connecting termination jumper
on first and last device on data
bus.
Check if all devices are
connected in daisy-chain
topology .
The network has not been
correctly wired.
Connect all devices only in
daisy-chain topology.
Determine the cable length
for furthest device.
Network cable length is too
long.
Ensure the total wire length
for the furthest device does
not exceed 1200 meters.
CODIS35v4.4
WEIGHT:
A4
SHEET 1 OF 1
SCALE:1:2
DWG NO.
TITLE:
REVISION
DO NOT SCALE DRAWING
MATERIAL:
DATE
SIGNATURE
NAME
DEBUR AND
BREAK SHARP
EDGES
FINISH:
UNLESS OTHERWISE SPECIFIED:
DIMENSIONS ARE IN MILLIMETERS
SURFACE FINISH:
TOLERANCES:
LINEAR:
ANGULAR:
Q.A
MFG
APPV'D
CHK'D
DRAWN
CODIS35v4.4
WEIGHT:
A4
SHEET 1 OF 1
SCALE:1:2
DWG NO.
TITLE:
REVISION
DO NOT SCALE DRAWING
MATERIAL:
DATE
SIGNATURE
NAME
DEBUR AND
BREAK SHARP
EDGES
FINISH:
UNLESS OTHERWISE SPECIFIED:
DIMENSIONS ARE IN MILLIMETERS
SURFACE FINISH:
TOLERANCES:
LINEAR:
ANGULAR:
Q.A
MFG
APPV'D
CHK'D
DRAWN