CIAT FLOWAY CLASSIC RHE User manual

FLOWAY
CLASSIC RHE/PHE
& VERTICAL PHE
01 - 2021
EN7565703-02
Control manual
Compact AHU Control 2 V1

FLOWAY EN-2
The illustrations in this document are for illustrative purposes only and not part of any o󰀨er for sale or contract. The manufacturer reserves the right to change the design
at any time without notice.

CONTENTS
1 - PREAMBLE ............................................................................................................................................................................. 4
2 - REGULATING CONTROLLER................................................................................................................................................ 5
2.1 - Introduction.......................................................................................................................................................................... 5
2.2 - Inputs/outputs ...................................................................................................................................................................... 5
2.3 - Alphanumeric terminal ......................................................................................................................................................... 8
2.4 - Touchscreen terminal ........................................................................................................................................................ 10
3 - FEATURES ............................................................................................................................................................................ 16
3.1 - Management of on and o󰀨 modes ..................................................................................................................................... 16
3.2 - Managing setpoints ........................................................................................................................................................... 16
3.3 - Safety and isolation damper .............................................................................................................................................. 16
3.4 - Mixing damper ................................................................................................................................................................... 17
3.5 - Filter management ............................................................................................................................................................ 17
3.6 - Temperature control .......................................................................................................................................................... 17
3.7 - Fan control ........................................................................................................................................................................ 19
3.8 - Energy recovery ................................................................................................................................................................ 21
3.9 - Coils .................................................................................................................................................................................. 22
3.10 - Free Cooling .................................................................................................................................................................... 23
3.11 - Night cooling .................................................................................................................................................................... 23
3.12 - CO2air quality ................................................................................................................................................................ 24
3.13 - Fire protection ................................................................................................................................................................. 24
3.14 - Remote control in Th-Tune room..................................................................................................................................... 25
3.15 - Temperature setpoint compensation ............................................................................................................................... 26
3.16 - Downgraded fresh air ow rate ....................................................................................................................................... 27
3.17 - Time management........................................................................................................................................................... 27
3.18 - Time schedule ................................................................................................................................................................. 27
3.19 - Access level..................................................................................................................................................................... 28
4 - MANAGING THE CONNECTION BETWEEN CONTROLLERS AND ALPHANUMERIC TERMINALS.............................. 29
4.1 - One controller and one LCD terminal ................................................................................................................................ 29
4.2 - Several controllers and terminals: ..................................................................................................................................... 29
4.3 - Electrical connections for the pLAN (local area network) .................................................................................................. 30
4.4 - Addressing the pLAN......................................................................................................................................................... 31
5 - CONNECTING TO A CMS..................................................................................................................................................... 35
5.1 - Modbus RTU ..................................................................................................................................................................... 35
5.2 - Modbus TCP/IP and BACnet IP ........................................................................................................................................ 36
5.3 - LON ................................................................................................................................................................................... 39
5.4 - KNX ................................................................................................................................................................................... 42
6 - COMMISSIONING ................................................................................................................................................................. 45
6.1 - Actions required prior to commissioning............................................................................................................................ 45
6.2 - Test mode .......................................................................................................................................................................... 45
6.3 - Calibration ......................................................................................................................................................................... 45
7 - FAULTS.................................................................................................................................................................................. 46
7.1 - Type of faults ..................................................................................................................................................................... 46
7.2 - Fault relays ........................................................................................................................................................................ 46
7.3 - Fault memory .................................................................................................................................................................... 46
7.4 - List of faults ....................................................................................................................................................................... 46
7.5 - Diagnostics ........................................................................................................................................................................ 47
8 - PARAMETERS ...................................................................................................................................................................... 49
8.1 - Machine parameters.......................................................................................................................................................... 49
8.2 - Setting parameter .............................................................................................................................................................. 50
8.3 - Reading parameter............................................................................................................................................................ 55
8.4 - Versions............................................................................................................................................................................. 58
8.5 - Fault level .......................................................................................................................................................................... 58
8.6 - Communication parameters .............................................................................................................................................. 59
8.7 - Calibration ......................................................................................................................................................................... 59
8.8 - SW direction ...................................................................................................................................................................... 60
8.9 - Prioritisation....................................................................................................................................................................... 61
8.10 - Intake FMA EC motor ...................................................................................................................................................... 61
8.11 - Exhaust FMA EC motor .................................................................................................................................................. 61
EN-3 FLOWAY
TRANSLATION OF THE ORIGINAL DOCUMENT

1 - PREAMBLE
This air handling unit is managed by its PLC. In addition to its control functions, it also monitors and detects any faults with the air
handling unit.
An HMI terminal associated with the PLC is used to view and modify the following parameters:
-Values of connected sensors
-Unit on/o󰀨 cycles
-Calibration of the sensors
-Detection of alarms and log of the last 100 alarms
-Password-protected conguration and operating parameters
-Device running times and time delays
-Managing time programs (6 weekly and 6 annual)
-Language selection
Various terminal variants are available, to provide adaptability to the widest possible range of requirements:
-Remote terminal
-Terminal sharing between several air handling units
-Simplied remote user control in the room to be conditioned
This device is not designed to be used by persons (including children) with limited physical, sensory or mental
capabilities, or by persons with insu󰀩cient experience or knowledge.
Only qualied personnel, who have received in-depth training in the equipment, are authorised to work on the machine or modify
the PLC's advanced parameters.
If it proves necessary to work on the unit, all the guidelines and instructions given in the maintenance brochures, on the labels or
in the instructions accompanying the equipment should rst be observed, along with any other applicable safety advice. It is in
particular recommended to cut all the power supplies to the unit using the disconnect switch and/or circuit breakers, and wait for
the motors and all other moving mechanical parts to stop.
FLOWAY EN-4

2 - REGULATING CONTROLLER
2.1 - Introduction
The control PLC is used to control and monitor the operating status of the various components of the air handling unit. Depending
on the options, it controls the temperature, manages the fans, monitors lter fouling and the air quality level. It can be connected
to a CMS so that it can be controlled remotely.
2.2 - Inputs/outputs
The PLC has analogue and on/o󰀨 inputs/outputs. The list of inputs/outputs is described below (depending on the options installed).
The controller is installed in the electrics box.
Input designation Type
U Universal input (analogue or on/off)
GND, C Shared
DI Dry contact On/Off input
Y 0-10V analogue output
Out Polarised 24 VAC On/Off output
NO Normally open potential-free on/off output
NC Normally closed potential-free on/off output
EN-5 FLOWAY

Connector Input Type Description
J1 G +24 Vac power supply
G0 Shared
J2
U1 0-10V Supply air duct pressure sensor or CO2 air quality measurement sensor
U2 NTC Temperature sensor (see assignment table below)
U3 NTC Temperature sensor (see assignment table below)
GND Shared
J3
U4 NTC Temperature sensor (see assignment table below)
U5 NTC Supply air temperature sensor in the additional casing
+Vdc Power supply to unit internal pressure sensors
+5VR Not used
GND Shared
J4
U6 0-10V Filter differential pressure measurement (see assignment table below)
U7 0-10V Fan differential pressure measurement (see assignment table below)
+Vdc Not used
+5VR Not used
GND Shared
J5
U8 0-10V Filter differential pressure measurement (see assignment table below)
U9 0-10V Fan differential pressure measurement (see assignment table below)
U10 On/off Setpoint 1 / Setpoint 2 contact
+Vdc Not used
+5VR Not used
GND Shared
J6
GND Shared
Y1 0-10V Hydraulic coil 1 valve control or electric heater triac control
Y2 0-10V Hydraulic coil 2 valve control
Y3 0-10V Intake fan control
J7
DI1 Pump 1 fault
DI2 Pump 2 fault
DI3 Remote control
DI4 Fire fault
GND Shared
J8 Not used
J9
Vout Not used
FBus1 - Remote display connection in Th-Tune room - Tx/Rx -
FBus1 + Remote display connection in Th-Tune room - Tx/Rx +
GND Remote display connection in Th-Tune room - common
J10 Not used
J11
BMS2 - ModBus RS485 CMS connection - Tx/Rx -
BMS2 + ModBus RS485 CMS connection - Tx/Rx +
GND ModBus RS485 CMS connection - shared
J12 Not used
J13 BMS1 Location for KNX, LON, Bacnet IP, Modbus IP, Webserver expansion board
J14
pLAN - pLAN - Rx/Tx-
pLAN + pLAN - Rx/Tx+
GND pLAN - shared
J15 pLAN connector for HMI terminal
J16
NO1 On/off Pump 1 control contact
NC1 Not used
C1 +24 Vac power supply
J17 Out2 On/off Supply air and return air dampers
C2 Shared
J18 Out3 On/off Fresh air and exit dampers
C2 Shared
J19 Out4 On/off Fresh air rate decrease (mixing damper)
C2 Shared
J20 Out5 On/off Fresh air rate increase (mixing damper)
C2 Shared
J21 C2 Shared
V-IN +24 Vac power supply
2 - THE CONTROL PLC
FLOWAY EN-6

Connector Input Type Description
J22 NO6 On/off AHU operating feedback
C6 Shared
J23 NO7 On/off Danger fault summary relay
C7 Shared
J24 NO8 On/off Maintenance faults summary relay
C8 Shared
J25
DI7H Not used
DI7 On/off Air intake fan control
DI7C Shared
DI8 On/off Extraction fan control
DI8H Not used
J26
Y4 0-10V Exhaust fan control
Y5 0-10V Rotary heat exchanger speed control or plate heat exchanger bypass servomotor control
U11 On/off Changeover thermostat
GND Shared
U12 0-10V Heat recovery unit differential pressure OR exhaust duct pressure
GND Shared
DI9 On/off Rotary heat exchanger check
DI10 On/off Electric heaters 1 and 2 fault summary
DI9C Shared
J27
NO9 On/off External generator (heater or cooler)
C9 Shared
NC9 Not used
NO10 Not used
C10 Not used
NC10 Not used
J28
C11 +24 Vac power supply
NO11 On/off Electric heater stage 1 control
NO12 On/off Electric heater stage 2 control or preheater control
NO13 On/off Pump 2 control
C11 +24 Vac power supply
Assignment of pressure and temperature sensors, depending on the unit type
Unit type
Classic RHE Classic PHE Vertical PHE
Supply air temperature sensor J2-U3 J2-U3 J2-U3
Return air temperature sensor J2-U2 J3-U4 J3-U4
Fresh air temperature sensor J3-U4 J2-U2 J2-U2
Intake fan pressure sensor J4-U7 J4-U7 J5-U9
Exhaust fan pressure sensor J5-U9 J5-U9 J4-U7
Intake lter fouling pressure sensor J4-U6 J5-U8 J5-U8
Exhaust lter fouling pressure sensor J5-U8 J4-U6 J4-U6
Customer terminals
The following inputs/outputs are provided for the customer's use, to remote control the machine and/or report the AHU's status.
This information is fed to unit terminal strips Xf18 and Xf22:
PLC terminals Customer terminals Function Type
J22-NO6/C6 Xf18-1/2 AHU operating feedback Dry contact output (250 Vac, 1A resistive load, 1A inductive load
with cosφ=0.6)
J23-NO7/C7 Xf18-3/4 Danger fault summary relay Dry contact output (250 Vac, 1A resistive load, 1A inductive load
with cosφ=0.6)
J24-NO8/C8 Xf18-4/5 Maintenance faults summary relay Dry contact output (250 Vac, 1A resistive load, 1A inductive load
with cosφ=0.6)
J5-U10/GND Xf18-6/7 Setpoint 1/Setpoint 2 changeover Dry contact input, not optically isolated
J7-DI3/GND Xf18-8/9 Remote control Dry contact input, not optically isolated
J7-DI4/GND Xf22-9/10 Fire detection Dry contact input, not optically isolated
2 - THE CONTROL PLC
EN-7 FLOWAY

2.3 - Alphanumeric terminal
The terminal is supplied equipped with an alphanumeric screen (8 lines x 22 characters) and 6 keys. It is connected to connector
J15 on the PLC via a telephone cable.
It is used to modify the programme parameters and view the machine state.
2.3.1 - Machine status
The terminal is used to view the machine state.
List of symbols and explanations
Indicates the unit run or shutdown request
Icon On/off request for the unit
Off from the terminal or the CMS
ashing On from the terminal or the CMS and off via the remote control
On from the terminal or the CMS
Indicates the state of the time schedule
Icon Time schedule state
No validated time schedule
At least one time schedule is validated but not active
At least one time schedule is validated and active
U:01 Indicates the unit's address on the pLAN bus
15:30 Indicates the time
21.4 °C Indicates the set temperature value (room, extraction or intake)
On Indicates the unit state
Unit status Description
Off The unit is off
Off due to a fault The unit is stopped following a fault
On The unit is operational
On setpoint 1 The unit is operational with the setpoints 1
On setpoint 2 The unit is operational with the setpoints 2
Night cooling Night cooling mode is active
Frost protection The unit is stopped but is providing frost protection
Test mode Test mode is active
Fire protection Fire protection is active
2 - THE CONTROL PLC
FLOWAY EN-8

Control active Indicates the operating status
Operating status Description
Damper opening The isolation damper is in the process of opening
Ventilation start-up The ventilation is in the process of starting up
Control active The control functions are active
Control limited Certain control functions are not authorised (e.g.: ow rate insufcient for operation of the electric heater)
Fan delay The AHU is in the process of shutting down but the ventilation remains active to cool the electric heaters
Free cooling Free cooling is in progress
Outdoor temperature limit The outdoor temperature is too low for the unit to operate
Heat recovery unit defrost preheat The heat recovery unit is defrosting.
Lower line (symbol fixed if operation requested but inactive, symbol animated if operation requested and active)
Indicates a "Cooling" request
Indicates a "Heating" request
Indicates the operation of the fan(s)
Indicates the "Air quality" operating mode
2.3.2 - Menus
The user interface is organised according to the menus below (certain menus are only accessible when the access level is 2 or 3
(see 3.18), and when the option is present on the machine):
1 / Machine status
2 / Setpoints
3 / Fault
4 / Fault memory
5 / Time schedule
5.1 / Weekly
5.2 / Annually
6 / Access levels
7 / Machine parameters (P01 to P99)
8 / Setting parameters (P100 to P299)
9 / Read parameters (P300 to P549)
10 / Versions (P550 to P599)
11 / Fault level (P600 to P699)
12 / Communication
12.1 / BMS1 (P700 to P709)
12.2 / BMS2 (P710 to P719)
12.3 / pLAN (P720 to P729)
13 / Calibration (P800 to P849)
14 / Direction of the inputs/outputs (P850 to P899)
15 / Prioritisation (P900 to P999)
17 / Intake FMA EC motor (P1200 to P1219)
19 / Exhaust FMA EC motor (P2200 to P2219)
21 / Test mode (P3500 to P3599)
22 / Measured values
2 - THE CONTROL PLC
EN-9 FLOWAY

2.3.3 - Buttons
The 6 keys on the interface are used to change the parameters, acknowledge faults, and switch the unit on or o󰀨. The operation
of these keys is described below.
Button Description
Esc Used to go up one level in the menu tree and access the machine status menu from the general menu
This button is used to view the faults on the display and indicates the presence of a fault:
Prg +
Acknowledgement of a fault.

This key has several functions:
1. to manage the masks on the display (next mask)
2. to go to the next line in the menu
3. to adjust the values of the monitoring parameters (decrease)

This key has several functions:
1. to manage the masks on the display (previous mask)
2. to go to the previous line in the menu
3. to adjust the values of the monitoring parameters (increase)
Prg + Switches the unit on.
Prg + Switches the unit off.
Used to validate the data entered and go into a menu.
It is continuously backlit to indicate when the power is on
2.4 - Touchscreen terminal
The terminal supplied is equipped with a 4.3" touchscreen display. It is connected to connector J15 on the PLC via a telephone
cable.
It is used to modify the programme parameters and view the machine state
2.4.1 - Machine status
The terminal is used to view the machine state.
2 - THE CONTROL PLC
FLOWAY EN-10

• Return air 21.4°C Indicates the controlled temperature value (supply, return or room air)
• Intake 10,000 m3/h 120 Pa: indicates the ow rate or pressure value measured at the intake
• Exhaust 11,500 m3/h 150 Pa: indicates the ow rate or pressure value measured at the exhaust
• Indicates the operation of the fan(s) (rotates when the fans are working)
• Unit status On Indicates the unit state
State of the unit Description
Off The unit is off
Off due to a fault The unit is stopped following a fault
On The unit is operational
On setpoint 1 The unit is operational with the setpoints 1
On setpoint 2 The unit is operational with the setpoints 2
Night cooling Night cooling mode is active
Frost protection The unit is stopped but is providing frost protection
Test mode Test mode is active
Fire protection Fire protection is active
• Control active Indicates the operating status
Operating status Description
Damper opening The isolation damper is in the process of opening
Ventilation start-up The ventilation is in the process of starting up
Control active The control functions are active
Control limited Certain control functions are not authorised (E.g.: ow rate insufcient for the electric heater operation)
Fan delay The AHU is in the process of shutting down but the ventilation remains active to cool the electric heaters
Free cooling Free cooling is in progress
Outdoor temperature limit The outdoor temperature is too low for the unit to operate
Heat recovery unit defrost preheat The heat recovery unit is defrosting.
• Current mode: symbol grey if operation requested but inactive, symbol coloured if operation
requested and active
Indicates the "Cooling" operating mode
Indicates the "Heating" operating mode
Indicates the "Air quality" operating mode
2.4.2 - Menu bar
Go back to the home screen
Go back to the top menu level
Parameter search
Select the access level
No active faults.
Fault present (in this case, the LED bar is lit, red for danger faults, and yellow for maintenance faults). Link to the list
of active faults.
2 - THE CONTROL PLC
EN-11 FLOWAY

2.4.3 - Menus
Main menu
Main menu Sub-menu 1 Sub-menu 2 Access level
Information 1
Login 1
Setpoints
Setpoints 1 1
Setpoints 2 1
Setpoint change 2
Setpoint compensation 2
Night cooling 2
Time program
Weekly 1 1
Weekly 2 1
Weekly 3 1
Weekly 4 1
Weekly 5 1
Weekly 6 1
Annual 1 1
Annual 2 1
Annual 3 1
Annual 4 1
Annual 5 1
Annual 6 1
Faults
Current fault 1
Log 1
Faults level 2
Value reading
Ventilation 1
Filters 1
Coils 1
Heat recovery units 1
Dampers 1
Pumps 1
Inputs / Outputs 1
Temperatures 1
Counters 1
Setpoint change status 1
EC FMA Intake FMA 1
Exhaust FMA 1
Curves
Temperature curves 1
Ventilation curves 1
Filter curves 1
2 - THE CONTROL PLC
FLOWAY EN-12

Main menu Sub-menu 1 Sub-menu 2 Access level
Settings
Language 1
Date and time 1
Ventilation
Fan management 2
Fan PID 2
Pressure thresholds 2
Air quality 2
Downgraded fresh air ow rate 2
Fire management 2
Energy optimisation Night cooling and free cooling 2
Heat recovery unit 2
Communication 2
Temperature
Temperature management 2
Temperature threshold 2
Temperature PID 2
Neutral zone limitation and compensation 2
Changeover 2
Frost protection 2
Input/output management I/O direction 2
Calibration 2
Prioritisation 2
Time del. / selections Time delays 2
EC fans 3
Emulation PGD 3
Service
Fault memory full 3
Machine parameters 3
Parameters back-up 3
Operating readings 3
2.4.4 - Use
Action
Start-up/shutdown
From the home screen, press and conrm
Fault acknowledgement
Press the alarm icon in the menu bar and press
Status: machine shut down
red
Status: machine on
green
Status: run request with the unit shut down
ashing red/green
Accessing the parameters
In each parameters table, it is possible to scroll down the table with a nger.
In the setpoint or setting parameters table, it is possible to modify a value by pressing on it. A numeric pad
will open, indicating the possible setting range (min. and max.), and this must be validated via
2 - THE CONTROL PLC
EN-13 FLOWAY

It is possible to seek a parameter from its number. To do so, press the icon in the menu bar. Enter the parameter number,
and validate with . If the parameter exists and your access level is su󰀩cient, you will be automatically redirected to the page
containing this parameter. Otherwise, an error message will be displayed.
Synoptic
From the home screen, pressing will access the machine's functional synoptic. Only the components present in the machine
are visible.
Return or room air
temperature
Extraction ow
Intake ow
Fresh air temperature Supply air temperature
Supply air duct pressure
Pressing on each component will access the corresponding reading parameters.
A ring positioned beside each component indicates its status:
-Grey: inactive
-Green: in operation
-Orange: maintenance fault
-Red: danger fault
Access level
Pressing on the padlock in the menu bar or main menu will access the access level selection.
The current level is displayed at the bottom of the screen. To go back to level 1, you need to enter the password "1111".
2 - THE CONTROL PLC
FLOWAY EN-14

Pressing on the stars will bring up a numeric keypad to enter the password for the desired level:
Once a password has been entered, is used to view the password, and is used to validate.
Curves
The screen records the values of the main parameters (temperatures, ow rate, duct pressure and lter di󰀨erential pressure).
It is possible to choose the record duration (1, 6, or 12 months), the oldest values are erased, which sets the sampling period
(1 acquisition every 60 s for example))
1 month (1 every 60 s)
6 months (1 every 400 s)
12 months (1 every 800 s)
Pressing brings up the curve settings:
zoom out on the vertical axis
zoom out on the vertical axis
zoom reset
change horizontal axis duration
save values to csv on USB stick (level 3?)
2 - THE CONTROL PLC
EN-15 FLOWAY

3 - FEATURES
3.1 - Management of on and off modes
The unit can be started by the terminal or by the CMS. Parameter P716 is used to authorise or deny CMS control of the unit.
When the unit is operating, an on/o󰀨 "remote control" input is used to stop the unit.
This may have been previously started up by the HMI in the ON position.
The unit's various operating modes can also be programmed (see time schedule 3.17). The unit has a "frost protection" mode
which is only used when the controlled temperature is the room temperature.
When this is activated the unit is o󰀨, but it will automatically restart if the room temperature drops below the P228 set threshold.
To be able to start up the unit, the machine parameters must be locked (P99 = yes)
if the unit is shut down via the terminal but remote control is authorised (P716=remote), then the air handling unit
may potentially start at any time (if ordered by the CMS, for example).
The unit will only operate if the fresh air temperature is above the minimum threshold (P265). If the unit has been started but the
outdoor temperature is too low, a periodic reminder will be issued every hour, to measure the outdoor temperature and check
whether it is above the threshold.
99 Conguration locked
716 Control type
228 Frost protection temperature setpoint
265 Fresh air temperature limit for unit operation
3.2 - Managing setpoints
The PLC manages setpoints 2 setpoint levels (setpoint 1 and setpoint 2) for the temperatures and ow rates/pressures. Setpoints 1
are, for example used when the building is occupied and setpoints 2 when the building is unoccupied.
Parameter P160 is used to choose between setpoints 1 and 2, either by time schedule or via the J5-U10 on/o󰀨 input, as well as
by the CMS control or override via the J5-U10 on/o󰀨 input. In the latter mode, if the On/O󰀨 input indicates setpoint 1 mode, it is
operating in setpoint 1; otherwise the operation is as per the last order received from the CMS or time schedule.
Parameter P161 is used to select whether the change in setpoint is based on the temperature setpoints, on the ventilation setpoints
(ow rate or pressure) or on both.
Setting P161 Operation
Setpoint Selection
Setpoint 1
Selection
Setpoint 2
Temperature Temperature Setpoint 1 Setpoint 2
Flow rate or pressure and mixing Setpoint 1
Ventilation Temperature Setpoint 1
Flow rate or pressure and mixing Setpoint 1 Setpoint 2
Temperature + Ventilation Temperature Setpoint 1 Setpoint 2
Flow rate or pressure and mixing
Note: the setpoint selection input is can be congured NO / NC; this table adopts the input as normally closed. If the actuation
takes place via the CMS, then the input becomes inactive.
160 Setpoint 1 / Setpoint 2 selection
161 Application of setpoint 1/setpoint 2 selection
3.3 - Safety and isolation damper
The unit may have up to 4 isolation dampers. They are connected to 2 outlets: outdoor side (fresh air/exit air) and building side
(supply air/return). The presence of the dampers is given by parameter P26.
The insulating damper is activated by an On/O󰀨 servomotor with spring-return. The time required for it to open is P108.
When the unit is stopped, this damper is normally closed.
It will open upon the unit start-up request, then after a timeout, the unit will switch to "Run" mode, and the damper kept open, until
the unit is shut down or a "danger" fault appears.
26 Isolation damper
108 Damper opening time delay
FLOWAY EN-16

3.4 - Mixing damper
If a mixing damper is present in the unit (P27 = with), it is necessary to congure its opening time (P166).
A minimum opening value can be set using parameters P208 and P209.
The damper operates with 100% fresh air in night cooling or free cooling mode. It is modulated when there is an air quality
requirement.
If there is a mixing damper present and the mixing opening demand is greater than 95%, then the outdoor side isolation dampers
(if present) close.
The mixing damper can be forced to close using parameter P163 (accessible via BMS).
27 Mixing damper
163 load shedding of mixing damper
166 Mixing damper opening time
208 Mixing damper minimum setpoint 1
209 Mixing damper minimum setpoint 2
3.5 - Filter management
Pressure sensors measure the lter fouling (intake and exhaust), and a fault appears if the lter is fouled (new lter to be ordered
and replacement scheduled) or blocked (machine is shut down).
The threshold is calculated automatically according to the lter type (M5, F7, F9, M5+F7, M5+F9, F7+F9) and the air ow rate.
It is possible to view the pressure di󰀨erence and thresholds for each lter (P312 to P317).
7Intake lter type
8Intake lter coefcient
15 Exhaust lter type
16 Exhaust lter coefcient
3.6 - Temperature control
The set temperature may be:
-The return air temperature
-The room temperature (if the Th-Tune room remote control is present)
-The supply air temperature
This choice is made via parameter P154.
The temperature is set via a PID which calculates a heating requirement (P395) or a cooling requirement (P394). There is one
heating setpoint (P180) and one cooling setpoint (P170), with the option to have a deadband between these two di󰀨erent setpoints.
The calculated requirement is then divided between the heating or cooling elements, in the following order of priority: heat recovery
unit, hydraulic coils, electric heater.
Heating requirement (%)
P182 Proportional band Heating
setpoint
Setpoint 1: P180
Setpoint 2: P181
Setpoint 1: P170
Setpoint 2: P171
Room temperature
Return air temperature
Supply air temperature
Cooling
setpoint
Cooling requirement (%)
P172 Proportional band
-The heating and cooling setpoints must not overlap in automatic mode (P155)
-In heating only or cooling only mode, the setpoints may overlap.
154 Target temperature selection
155 Temperature control mode selection
168 Heating or cooling change authorisation time delay
Cooling PID
170 Temperature setpoint 1 in cooling mode
171 Temperature setpoint 2 in cooling mode
172 Temperature control PID proportional band (P) in cooling mode
173 Temperature control PID integral time (I) in cooling mode
174 Temperature control PID derivative time (D) in cooling mode
3 - FEATURES
EN-17 FLOWAY

Heating PID
180 Temperature setpoint 1 in heating mode
181 Temperature setpoint 2 in heating mode
182 Temperature control PID proportional band (P) in heating mode
183 Temperature control PID integral time (I) in heating mode
184 Temperature control PID derivative time (D) in heating mode
Supply air limitation
When control is being applied to the return air or room air, the supply air temperature can be limited. This limitation is used to avoid
blowing air at too high a temperature in heating mode or too cold a temperature in cooling mode. This limitation is activated by
parameter P156. A PI controller (proportional-integral) limits the heating or cooling requirement. If integral control is deactivated
(P233=0), the proportional band (P232) must be approximately 5°C, so as to prevent too high or too low a supply air temperature.
Cooling request
limitation
Proportional band P232
Integral time P233
Supply air
lower limit setpoint:
P230
Supply air
temperature
Low
threshold
fault P240
100%
0%
Supply air
temperature
Supply air
upper limit setpoint:
P231
Proportional band P232
Integral time P233
High
threshold
fault P241
100%
0%
Heating request
limitation
156 Supply air limitation = With or Without
230 Supply air temperature low limit setpoint
231 Supply air temperature upper limit setpoint
232 Supply air temperature limit proportional band
233 Supply air temperature limit integral time
When the cooling requirement is minimised, cooling compensation is used to start up the heat recovery unit or close the bypass
if the supply air temperature is less than P230-2°C (if P230>0) or P230-P232 (if P230=0). This function prevents excessively cold
supply air (outside air) if there is a cooling requirement and the outside air is cold (excluding night cooling). This compensation is
proportional control of a 5°C proportional band.
There is hysteresis on the cooling requirement and supply air temperature, to prevent inadvertent starts/shutdowns.
Cooling compensation
Heat recovery unit demand
Proportional band
P232 if P230 = 0
2°C if P230 > 0
5°C
Supply air lower limit
setpoint: P230
Supply air
temperature
Low
threshold
fault P240
100%
0%
10%
3 - FEATURES
FLOWAY EN-18

Supply air compensation
When control is being applied to the return air or room air, the supply air temperature can be compensated. This compensation is
used avoid blowing air at too cold or too high a temperature when the control is in deadband mode (no heating or cooling requirement
calculated). This compensation is activated by parameter P157.
Proportional band P235 Supply air
compensation
lower limit P234
Supply air
compensation
upper limit P236
Proportional band P237
Low
threshold
fault P240
High
threshold
fault P241
Heating compensation
(%)
Cooling compensation
(%)
Supply air temperature
100%
0%
157 Supply air compensation in deadband = With or Without
234 Low supply air temperature compensation setpoint in deadband
235 Low supply air temperature compensation proportional band in deadband
236 High supply air temperature compensation setpoint in deadband
237 High supply air temperature compensation proportional band in deadband
The temperature upper and lower thresholds (P240 to P245) are used to trigger a fault if the temperature is outside of these limits.
240 Supply air temperature low limit threshold
241 Supply air temperature upper limit threshold
242 Return air temperature low limit threshold
243 Return air temperature upper limit threshold
244 Room temperature low limit threshold
245 Room temperature upper limit threshold
3.7 - Fan control
The controller runs the plug fans with an EC motor. The unit has one intake fan and one exhaust fan. Pressure sensors for measuring
the air ow rate are wired on the PLC.
The fans can be under constant duct ow rate control or constant duct pressure control.
Constant air ow control (P104)
The ow rate setpoints are congurable: Intake ow rate setpoints 1 / 2 (P112, P113) and exhaust ow rate setpoints 1 / 2 (P128, P129)
The PID for the intake motor control is managed via P114 to P116, and the exhaust motor control via P130 to P132
Intake ow
112 Air intake fan ow rate setpoint 1
113 Air intake fan ow rate setpoint 2
114 Air intake fan ow control PID proportional band (P)
115 Air intake fan ow rate control PID integral time (I)
116 Air intake fan ow rate control PID derivative time (D)
Extraction ow
128 Air extraction fan ow rate setpoint 1
129 Air extraction fan ow rate setpoint 2
130 Air extraction fan ow rate control PID proportional band (P)
131 Air extraction fan ow rate control PID integral time (I)
132 Air extraction fan ow rate control PID derivative time (D)
3 - FEATURES
EN-19 FLOWAY

Constant duct pressure control
A pressure sensor should be added and installed in the duct before this function is activated. This sensor should be connected to
terminal strip Xf19 in the unit. An autozero should be performed when commissioning this sensor. Refer to the unit's manual for
the electrical connection and autozero.
The intake pressure setpoints are adjustable: setpoints 1/2 (P118, P119). The PID for the intake motors control is managed via
P120 to P122
In this case the exhaust fan operates based on intake ow rate feedback (default setting) with a multiplier coe󰀩cient (P106)
to create a positive pressure or vacuum pressure at the exhaust.
Intake duct pressure
118 Air intake duct pressure setpoint 1
119 Air intake duct pressure setpoint 2
120 Air intake duct pressure control PID proportional band (P)
121 Air intake duct pressure control PID integral time (I)
122 Air intake duct pressure control PID derivative time (D)
124 Intake duct pressure lower limit threshold
125 Intake duct pressure upper limit threshold
Exhaust duct pressure
The exhaust pressure setpoints are adjustable: setpoints 1/2 (P136, P137). The PID for the intake motors control is managed via
P138 to P140
136 Exhaust duct pressure setpoint 1
137 Exhaust duct pressure setpoint 2
138 Exhaust duct pressure control PID proportional band (P)
139 Exhaust duct pressure control PID integration time (I)
140 Exhaust duct pressure control PID derivative time (D)
142 Exhaust duct pressure lower limit threshold
143 Exhaust duct pressure upper limit threshold
Faults
The pressure sensors installed on the fans are also used to detect the presence of the air ow (threshold P111). The PLC triggers
a fault if the ow rate is greater or less than the xed limits.
Flow rate control
110 AHU max ow rate
111 AHU ow rate low limit threshold
Minimum and maximum ow rates depending on the unit model:
Model (P1) Max. ow rate (P110) Min. ow rate (P111)
Classic PHE 1000 Alu 1200 m3/h 300 m3/h
Classic PHE 1000 PP 1200 m3/h 300 m3/h
Classic PHE 2000 Alu 2200 m3/h 500 m3/h
Classic PHE 2000 PP 2200 m3/h 500 m3/h
Classic PHE 3000 Alu 3700 m3/h 700 m3/h
Classic PHE 4000 Alu 5100 m3/h 900 m3/h
Classic PHE 6000 Alu 6600 m3/h 1400 m3/h
Classic RHE 1000 Alu 1450 m3/h 300 m3/h
Classic RHE 1000 PP 1450 m3/h 300 m3/h
Classic RHE 2000 Alu 2800 m3/h 500 m3/h
Classic RHE 2000 PP 2800 m3/h 500 m3/h
Classic RHE 3000 Alu 4500 m3/h 700 m3/h
Model (P1) Max. ow rate (P110) Min. ow rate (P111)
Classic RHE 4000 Alu 5700 m3/h 900 m3/h
Classic RHE 5000 Alu 7000 m3/h 900 m3/h
Classic RHE 6000 Alu 8500 m3/h 1400 m3/h
Classic RHE 7500 Alu 11,000 m3/h 1400 m3/h
Classic RHE 10000 Alu 14,000 m3/h 2500 m3/h
Classic RHE 15000 Alu 18,000 m3/h 3000 m3/h
Vertical PHE 700 Alu 1200 m3/h 300 m3/h
Vertical PHE 700 PP 1200 m3/h 300 m3/h
Vertical PHE 1500 Alu 2000 m3/h 700 m3/h
Vertical PHE 1500 PP 2000 m3/h 700 m3/h
Vertical PHE 2000 Alu 2600 m3/h 700 m3/h
Vertical PHE 2000 PP 2600 m3/h 700 m3/h
3 - FEATURES
FLOWAY EN-20