Zehnder Rittling CALADAIR EASY 5.0 Manual

always the best climate
Decorative radiators Comfortable indoor ventilation Heating and cooling ceilings Clean air solutions
Installation, Service and User Manual
Zehnder EASY 5.0

Zehnder EASY 5.0
2
Contents
1. Physical presentation of the PG 5.0 touchscreen __________________________________________________________ 5
2. Physical presentation of the CLD-283 controller __________________________________________________________ 6
3. Electrical connection of CLD-283 controller/PG 5.0 DISPLAY ______________________________________________8
4. Zehnder Easy 5.0 and Zehnder EDT2 remote touchscreen controls (Optional) _______________________________8
4.1. Zehnder Easy 5.0 wall-mounted touchscreen master control _______________________________________________8
4.2. Zehnder EDT2 wall-mounted touchscreen user control_____________________________________________________8
5. Definition of thermal sequences __________________________________________________________________________9
5.1. General ________________________________________________________________________________________________9
5.2. Demand and need for heating _________________________________________________________________________ 10
5.3. Demand and need for cooling ___________________________________________________________________________10
5.4. Demand and need for heat recovery _____________________________________________________________________10
6. Initialisation of thermal sequences at start-up_____________________________________________________________ 11
7. Start-up sequence______________________________________________________________________________________ 11
8. Shutdown sequence ___________________________________________________________________________________ 12
9. Night cooling function __________________________________________________________________________________12
10. Anti-icing function by reducing the supply air volume ______________________________________________________14
11. Anti-fire function _______________________________________________________________________________________16
11.1. General information on the function and its possible configuration ________________________________________ 16
11.2. Fire alarm (N°58) _____________________________________________________________________________________ 17
12. Commissioning procedure ______________________________________________________________________________18
13. Time period settings____________________________________________________________________________________19
13.1. General _______________________________________________________________________________________________19
13.2. Priorities for time periods and external controls _________________________________________________________ 20
13.3. Holiday calendar ______________________________________________________________________________________ 21
13.4. Recommendations for time period settings in the LOBBY version _________________________________________ 22
13.5. Recommendations for time period settings in the DIVA and QUATTRO versions ____________________________ 22
13.6. Recommendations for time period settings in the ECO et MAC2 versions __________________________________ 23
14. Maintenance and fault diagnosis ________________________________________________________________________ 23
14.1. General ______________________________________________________________________________________________ 23
14.2. Checks prior to any diagnosis __________________________________________________________________________ 24
14.3. Simplified diagnosis ___________________________________________________________________________________ 24
14.4. Advanced diagnosis ___________________________________________________________________________________ 24
14.4.1. Checking an active BMS _______________________________________________________________________________ 25
14.4.2. Input checks __________________________________________________________________________________________ 25
14.4.3. Output checks ________________________________________________________________________________________ 26
14.4.4. Manual control of outputs______________________________________________________________________________ 27
15. Alarms _______________________________________________________________________________________________ 28
15.1. General ______________________________________________________________________________________________ 28
15.2. Alarm class ___________________________________________________________________________________________ 28
15.3. Alarm action __________________________________________________________________________________________ 28
15.4. Alarm time limit and time unit __________________________________________________________________________ 29
15.5. Alarm threshold _______________________________________________________________________________________ 29
15.6. Alarm state (or status) _________________________________________________________________________________ 29
15.7. Active alarms _________________________________________________________________________________________ 29
15.8. Alarm history _________________________________________________________________________________________ 30
15.9. Alarm maintenance (filters) ____________________________________________________________________________ 30
15.10. Alarm and fault table ___________________________________________________________________________________31
15.11. Fan feedback and difference thresholds_________________________________________________________________ 36
15.12. Frost protection alarm details __________________________________________________________________________ 37
16. BMS communication ___________________________________________________________________________________ 37
16.1. General ______________________________________________________________________________________________ 37
16.2. Modbus RTU RS485 communication ___________________________________________________________________ 38
16.3. Modbus TCP communication ___________________________________________________________________________ 39
16.4. Bacnet MS/TP and Bacnet IP communication ___________________________________________________________ 40
16.5. IP configuration (DHCP) _______________________________________________________________________________ 42
16.6. Modbus and BACnet exchange tables___________________________________________________________________ 42
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0

Zehnder EASY 5.0
3
16.6.1. Machine status________________________________________________________________________________________ 43
16.6.2. Guidelines ____________________________________________________________________________________________ 44
16.6.3. Faults and alarms _____________________________________________________________________________________ 46
17. On-board web server __________________________________________________________________________________ 48
18. Temperature control modes ____________________________________________________________________________ 48
18.1. Selection of temperature control mode _________________________________________________________________ 49
18.2. Constant supply air temperature _______________________________________________________________________ 50
18.3. Supply air temperature in relation to the outdoor temperature (supply air law) ______________________________51
18.4. Constant return air temperature ________________________________________________________________________ 51
18.5. Return air temperature in relation to the outdoor temperature (return air law) ______________________________ 52
19. Fan controller modes __________________________________________________________________________________ 52
19.1. General ______________________________________________________________________________________________ 53
19.2 ECO controller ________________________________________________________________________________________ 53
19.3. DIVA controller ________________________________________________________________________________________ 54
19.4. LOBBY controller _____________________________________________________________________________________ 55
19.5. MAC2 controller_______________________________________________________________________________________ 56
19.6. QUATTRO controller___________________________________________________________________________________ 57
20. Control of the electric air heater (BE) ____________________________________________________________________ 58
20.1. Modulation of thermal output __________________________________________________________________________ 58
20.2. Overheating protection via safety thermostat THS _______________________________________________________ 59
21. Control of the hot water heating coil ____________________________________________________________________ 60
21.1. Modulation of thermal output __________________________________________________________________________ 60
21.2. Frost protection thermostat (THA) ______________________________________________________________________ 60
21.3. Thermal output _______________________________________________________________________________________ 60
22. Control of the hot water pump ___________________________________________________________________________61
23 Control of the cold water coil ____________________________________________________________________________61
23.1. Modulation of thermal output __________________________________________________________________________ 61
23.2. Frost protection ______________________________________________________________________________________ 62
23.3. Thermal output _______________________________________________________________________________________ 62
24. Control of the cold water pump _________________________________________________________________________ 62
25. Control of the electric fresh air preheating coil ___________________________________________________________ 62
26. Control of the rotary heat exchanger ____________________________________________________________________ 64
26.1. General ______________________________________________________________________________________________ 64
26.2. Modulation of the heat recovery rate____________________________________________________________________ 64
26.3. Rotary exchanger feedback ____________________________________________________________________________ 64
27. Control of the plate heat exchanger _____________________________________________________________________ 65
27.1. General ______________________________________________________________________________________________ 65
27.2. Modulation of the heat recovery rate____________________________________________________________________ 66
27.3. Protection against icing of the plate heat exchanger _____________________________________________________ 66
28. LOBBY pressure transducers ___________________________________________________________________________ 68
29. MAC2 / QUATTRO pressure transducers ________________________________________________________________ 69
30. ECO / DIVA fan operating control pressure switches______________________________________________________ 70
31. PT1000 temperature sensor____________________________________________________________________________ 71
32. CO2sensor ___________________________________________________________________________________________ 72
33. Help with setting PID parameters _______________________________________________________________________ 73
34. Control of the output voltage of the digital outputs DO ____________________________________________________ 75
35. Presentation of the “PG 5.0” touchscreen _______________________________________________________________ 76
35.1. Technical specifications _______________________________________________________________________________ 76
35.2. Software version and regulatory compliance ____________________________________________________________ 76
35.3. PG 5.0 touchscreen basic settings _____________________________________________________________________ 77
35.4. Access level __________________________________________________________________________________________ 77
35.5. Dashboard and home pages____________________________________________________________________________ 77
35.5.1. Home page 1__________________________________________________________________________________________ 77
35.5.2. Home page 2 _________________________________________________________________________________________ 78
35.5.3. Home page 3 _________________________________________________________________________________________ 79
35.6. Navigation and menu access ___________________________________________________________________________ 79
Contents
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0

Zehnder EASY 5.0
4
Legal regulations
All rights reserved.
This manual has been compiled with the utmost care. Nevertheless, the publisher accepts no liability for damage caused
by missing or incorrect details in this operating manual. We reserve the right at any time and without prior notification to
change the content of these instructions in part or as a whole.
The information contained in these documents is the property of Zehnder Group. Any form of publication, whether in
whole or in part, requires the written approval of Zehnder Group. In-house duplication, designated for the evaluation of
the product or for proper use, is permitted and not subject to approval.
Zehnder manufacturer’s warranty
The current device terms are available online
(https://www.caladair.com/en/espace-client/media/sales-terms-and-conditions).
Hard copies can be obtained via our established sales channels.
Trademarks
All trademarks are recognised, even if they are not separately labelled. A missing label does not mean that an article or
sign is free of trademark rights.
© 2021 Zehnder Group
SAFETY AND ENVIRONMENTAL GUIDELINES
In accordance with the regulations in force, the installation and maintenance of the machine must only be carried out by
technically qualified personnel authorised for this type of appliance and work.
Use the necessary Personal Protective Equipment to avoid injury related to electrical, mechanical (injuries from contact
with metal sheets, sharp edges, etc.) and acoustic hazards.
Do not use the appliance for any purpose other than that for which it is designed. This appliance may only be used to
convey air free of hazardous compounds, construction dust, etc.
Move the appliance as described in the chapter on handling.
Grounding must be done in accordance with the applicable standards. Never switch on an ungrounded appliance.
Before carrying out any work, make sure that the unit is switched off and wait for the moving parts to stop completely
before opening the doors (fans).
During operation, inspection panels, doors and hatches must always be fitted and closed.
The appliance can only be switched on and off via the proximity switch.
The safety and control equipment must not be removed, short-circuited or disabled.
The installation must comply with fire safety regulations.
All waste produced must be handled in accordance with the regulations in force.
It is the responsibility of the installer of the equipment to ensure compliance with the regulations concerning noise
emissions inside the building and to adapt the installation and site conditions if necessary.
We accept no liability for damage resulting from misuse of the equipment, unauthorised repair or modification or failure
to observe these instructions.
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0

Zehnder EASY 5.0
5
1. Physical presentation of the PG 5.0 touchscreen
The PG 5.0 touchscreen replaces the ED9200 display.
The 4.3’’ touch technology with a display of 65,000 colours allows high-quality images and advanced features that
facilitate human-machine interaction and make navigation between the different screens easier.
It is protected against the weather and UV rays thanks to its IP65 protection rating and a swivel cap attached directly to
the faceplate of the machine.
The screen is powered by a 230V AC / 24V DC transformer and communicates with the CLD-283 controller in Modbus
RTU RS485 via the “Ext DISP.” port . The screen is the master and the controller is the slave.
Communication
Modbus RTU RS485
(Display Master / Controller Slave)
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0
1G
-
+
2GD
P1 RxTx
P2 RxTx
TCP/1P
P/B
B 50
A 51
P
1
P
2
N 52
E 53
B 60
A 61
N 62
E 63
DI1a 71
DI2a 72
DI3a 73
DI4a 74
DI5a 75
DI6a 76
DI7a 77
DI8a 78
AO1a 91
AO2a 92 AO3a 93 AO4a 94 AO5a 95
ANGD 90
Ext.
Disp.
4+C
10 GDO
11 DO1b
12 DO2b 13 DO3b 14 DO4b 15 DO5b 16 DO6b
17 DO7b
30 AGND 33 AGND 40 AGND 43 AGND
31 AI1a
32 AI2a 34 AI3a 35 AI4a
41 UI1a
42 UI2a 44 UI3a 45 UI4a
3
+
+
L N
230V AC
24 V DC

Zehnder EASY 5.0
6
2. Physical presentation of the CLD-283 controller
The CLD-283 controller is physically very similar to the previous version. The number of inputs/outputs remains
unchanged, as do the dimensional characteristics.
Terminal Definition Details
G0 (+)
24V AC power supply
G (+) is also used to power TRPS, TRPR, CO.
sensors.
G0 (-)
Grounding
+C (24V DC) 24V DC voltage source used only for DI and UDI. It is a 24V DC (stabilised direct current) voltage
source.
Illuminated indications by (4) LEDs
P1 RxTx Status LED for RS485 port 1. The LED flashes when communication is active.
The LED is off when there is no active
communication.
P2 RxTx Status LED for port 2 reserved for communication
with another expansion controller.
TCP/IP Status LED for TCP/ IP port.
P/B Status LED of the board (Printed Board). The LED is lit when the controller is switched on.
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0
Controller
identification
1G
-
+
2GD
P1 R xTx
P2 R xTx
TCP/1P
P/B
B 50
A 51
P
1
P
2
N 52
E 53
B 60
A 61
N 62
E 63
DI1a 71
DI2a 72
DI3a 73
DI4a 74
DI5a 75
DI6a 76
DI7a 77
DI8a 78
AO1a 91
AO2a 92 AO3a 93 AO4a 94 AO5a 95
ANGD 90
Ext.
Disp.
4+C
10 GDO
11 DO1b
12 DO2b 13 DO3b 14 DO4b 15 DO5b 16 DO6b
17 DO7b
30 AGND 33 AGND
40 AGND 43 AGND
31 AI1a
32 AI2a
34 AI3a 35 AI4a
41 UI1a
42 UI2a 44 UI3a 45 UI4a
3
5 AO8 DI
Status
LEDs
Port P1
RS485
Port P2
RS485
Touchscreen
port
Power
supply
7 DO 4 AI 4 UI TCP-IP
port

Zehnder EASY 5.0
7
(7) Digital outputs DO
GDO Common to DOs and internally connected to G (+)
DO1…DO7
24V AC polarised outputs (controller supply
voltage), connected to G0
(-) internally
The DO outputs provided for the user must be
relayed or the 3.15A protection fuse on the
controller’s 24V AC power supply will blow.
(5) Analogue outputs AO
AGND Common
AO1…AO5 Outputs configured as 0-10V.
(8) Digital inputs DI
AGND Common
DI1…DI8 24V DC polarised inputs (dry contact between +C
and the corresponding DI input).
(4) Analogue inputs AI
AGND Common
AI1…AI4
Inputs configured as PT1000 or 0-10V depending on
the machine version (see electrical diagram for the
machine)
(4) Universal inputs UI
AGND Common
UI1…UI4
Inputs can be configured as analogue input AI or
digital input DI depending on the machine version
(see electrical diagram for machine)
(1) TCP-IP port
Port reserved for communication between the
machine and a BMS via TCP-IP link.
RJ45 plug interface
Available protocols: Bacnet IP or Modbus TCP
(1) Port P1 RS485 (Port P1)
Reserved port for communication between the
machine and a BMS via RS485 serial link.
Screw connector interface
Available protocols: Bacnet MS/ TP or Modbus RTU
(1) Port P2 RS485 (Port P2)
Port reserved for communication with another
controller or for communication with the Zehnder
EDT2 remote touchscreen.
(1) PG 5.0 touchscreen communication port
Port reserved for communication with the PG 5.0
touchscreen.
24 V AC L
N
G
10
11
12
G0
B 50
A 51
P
1N 52
E 53
P
2
B 60
A 61
N 62
E 63
Ext.
Disp.
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0

Zehnder EASY 5.0
8
3. Electrical connection controller CLD-283/PG 5.0 DISPLAY
The display has a 2-pole plug for 24V DC power supply and a 3-pole plug to allow Modbus communication with the
controller.
4. Zehnder Easy 5.0 and Zehnder EDT2 remote touchscreen controllers (Optional)
4.1. Zehnder Easy 5.0 wall-mounted touchscreen master control
The touchscreen is available as an option for remote operation from the ventilation
unit up to a distance of 100m.
The optional kit is comprised of:
■A portable screen
■An electrical harness that can be extended to the desired length up to 100m
■A screen cover
■One wall mounting plate for surface mounting.
The electrical connection between the remote display and the ventilation unit is the responsibility of the installer.
Observe the electrical connection indicated in chapter III ELECTRICAL CONNECTION CLD-283 CONTROLLER/PG 5.0.
DISPLAY. To extend the supplied electrical harness, use:
■a 2x0.75mm cable (or equivalent) for the 24V DC power supply
■A Belden 3106A cable (or equivalent) for communication.
It is not possible to operate the on-board touch control and the remote touch control simultaneously. Only one control at
a time can function. The general electrical control diagram is available in the installation and operating instructions of
the ventilation unit.
For quick access during maintenance, consider reconnecting the faceplate screen instead of the remote screen.
4.2. Zehnder EDT2 wall-mounted touchscreen user controller
The Zehnder EDT2 wall-mounted touchscreen user controller is an optional room touch controller
for end users. It offers simplified functionality compared to the Zehnder Easy 5.0 wall-mounted
touchscreen master controller.
See manual MS-REL-002 - Zehnder EDT2 for the use and installation of the Zehnder EDT2
wall-mounted touchscreen user controller.
1Modbus communication plug
224V DC power supply plug
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0
RX/TX+
RX/TX-
GND +24V DC
0V DC

Zehnder EASY 5.0
9
5. Definition of thermal sequences
5.1. General
The temperature control is defined by 3 different thermal sequences illustrated by a pictogram visible from the main
screen (the size of the coloured area indicates the calculated requirement of the sequence):
■Cooling sequence (management of the cold coil: BF cold water coil, DX or DXR direct expansion coil, CO coil
depending on version).
■Recovery sequence (managed by rotary or plate heat exchanger depending on version)
■Heating sequence (management of the heating coil: electric coil BE, water coil BC, changeover coil CO,
reversible direct expansion coil DXR according to version)
Each sequence is managed by its own PID parameters, and each sequence is connected to an analogue output (AO)
(see electrical diagram for the relevant machine).
In the case of a rotary heat exchanger, the recovery sequence depends on the speed of rotation of the wheel: the faster
the wheel turns, the greater the heat recovery. When it is not operating, there is no heat recovery, and this is also the
case when running in free cooling or free heating mode.
In the case of a plate heat exchanger, the recovery sequence acts on the opening angle of the bypass flap: the more the
bypass closes, the greater the fresh air volume passing through the exchanger and the greater the heat recovery. The
bypass also provides anti-icing (specific PID parameters), free cooling and free heating functions.
These 3 sequences work in succession according to the following descriptive diagrams.
Thermal sequences with heat recovery requirements:
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0
10V
Cooling coil output
Cooling requirement (summer)
Temp. Measured < Setpoint
+
Temp. Outdoor > Return temperature
Heating requirement (winter)
Temp. Measured > Setpoint
+
Temp. Outdoor < Return temperature
Heat exchanger/bypass output
Heat exchanger/bypass output
Heating coil output
0V
Cooling coil Heat exchanger Cooling coil
Cooling
+
Cooling recovery
Recovery
of cold
Recovery
of heat
Heating
+
Recovery of heat
Cooling Heating

Zehnder EASY 5.0
10
Thermal sequences with no heat recovery requirements:
5.2. Demand and need for heating
The heating coil (hot water or electric) operates when heat is required, which is when:
■The measured supply air temperature is lower than the setpoint supply air temperature (supply air temperature control
mode)
■The measured return air temperature is lower than the setpoint return air temperature (return air temperature control
mode).
The operation of the electric heating coil depends on the operation of the supply air fan: when there is an alarm (ID = 1
Supply air fan alarm) or when the anti-icing function is activated by lowering the supply air volume, the electric heating
coil is immediately switched off in order to prevent the heating element and its immediate vicinity from overheating.
5.3. Demand and need for cooling
The cold water cooling coil operates when cooling is required, which is when:
■The measured supply air temperature is higher than the setpoint supply air temperature (supply air temperature
control mode)
■The measured return air temperature is higher than the setpoint return air temperature (return air temperature control
mode)
5.4. Demand and need for heat recovery
The heat exchanger operates when there is a need for heat recovery. This is the case when:
■There is a heating requirement and the extraction temperature is higher than the fresh air temperature (the fresh air is
preheated)
■There is a need for cooling and the return air temperature is lower than the fresh air temperature.
Depending on the need for heat recovery, the controller will act either on the opening angle of the bypass flap (plate
heat exchanger) or on the speed of rotation of the rotary exchanger (rotary heat exchanger).
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0
10V
Cooling coil output
Cooling requirement (summer)
Temp. Measured < Setpoint
+
Temp. Outdoor < Return temperature
Heating requirement (winter)
Temp. Measured > Setpoint
+
Temp. Outdoor > Return temperature
Heat exchanger/bypass output
Heating coil output
0V
Cooling coil Heat exchanger Cooling coil
Cooling Free cooling Free heating Heating
Cooling Heating

Zehnder EASY 5.0
11
6. Initialisation of thermal sequences at start-up
Initialisation at start-up allows the machine to be started at an operating point that is as close as possible to the one that
will be recalculated during operation in order to avoid any source of discomfort and unnecessary energy consumption.
The initialisation of the thermal sequence at start-up depends on the outdoor temperature measured at the time the
machine is started:
**The control output of the 3-way valve or the control output of the electric heating coil is at 100% (10V).
** ECO/DIVA: the DEP S pressure switch contact is open; LOBBY: the pressure signal is below the minimum threshold;
MAC2/QUATTRO: the air volume signal is below the minimum threshold.
7. Start-up sequence
When the startup sequence is active, it can be identified by the pictogram in the in the “operating mode” area of the
home page.
The start-up sequence is activated when all the following conditions are met:
■The unit is ON
■There are no active class A alarms (alarms that shut down the unit)
■The external shutdown command is not active
■At least one time schedule (reduced operation or normal operation) is active, or a forced operation (normal operation
or reduced operation) is active, or the anti-fire function configured to start the unit is active, or there is a request for
operation from the BMS.
The start-up sequence takes a total of 120 seconds. During this time, the alarms are disabled (except for the THS
electric battery overheating alarm (63), which is monitored during this period) and the AHU starts up at the operating
point defined at the initialisation of the thermal sequences at start-up. The minimum fan control signal does not apply.
The fresh air and exhaust air registers open as soon as the start sequence is activated. The control signal for the return
air fan is enabled 15 seconds after the start sequence is activated. 15 seconds later, the control signal for the supply air
fan is enabled and the supply air fan starts. The outputs for controlling the 3-way valves and the heating or cooling
pumps are activated.
Once the 120 seconds have elapsed, the fan unit switches to normal mode at the end of the start-up sequence. The
minimum and maximum fan control signal is then taken into account and the alarm monitoring function is activated.
In the event of a power failure, the unit will automatically restart as soon as the power supply is restored.
Outdoor temperature < +3°C Outdoor temperature ≥ +3°C
The unit starts when 100% heat is required*.
As long as the feedback signal from the supply air fan is off*,
the heating coil BE is not activated.
The unit starts with maximum energy recovery.
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0

Zehnder EASY 5.0
12
Access path to the function (Access level: Expert)
Step 1 →Step 2 →Step 3 →Step 4
From
screen
Area to
click
8. Shutdown sequence
When the shutdown sequence is active, it can be identified by the pictogram in the in the “operating mode” area of
the home page.
The shutdown sequence occurs when at least one of the following conditions is met:
■Appearance of an alarm whose action requires the normal shutdown of the unit (note that some alarms are
programmed for rapid shutdown, in which case the shutdown sequence is ignored and the unit shuts down
immediately)
■The unit is switched to OFF
■No active time schedule
■The anti-fire function is set to stop the unit
■Shutdown request from the BMS.
The shutdown sequence lasts for a time related to the setting of the fan shutdown time limits (post-ventilation) and the
fresh air and exhaust air register closing time limits. When the shutdown sequence is activated, the alarm management
function and the electric coil output are immediately deactivated (the hot/cold water and recovery coil outputs remain
active). The supply air fan is switched off after 180 seconds. The return air fan is switched off 30 seconds later. The
fresh air and return air registers are closed 5 seconds after the return air fan has stopped and all actuator control signals
are deactivated.
9. Night cooling function
When night cooling is active, it can be identified by the pictogram in the in the “operating mode” area of the home
page.
Night cooling takes advantage of the cool conditions outside at night to lower the temperature of the building and
extract the energy accumulated during the day. This function allows the temperature to be maintained the following day
at a level that ensures greater comfort while limiting energy consumption for cold production. A specific fan setpoint
(fan offset) can be set to change (plus or minus) the air volume when the function is active.
The activation of night cooling requires thermal conditions to be met both during the day and also during the night
period (00:00 - 07:00 factory setting) for which it is programmed.
Functions Cooling
Main menu Function settingsSettings and configuration
Sensors
Alarms
PID loops
Functions
Actuators
Protection against icing
Protection against fire
Forced operation
Cooling
Cold recovery
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0

Zehnder EASY 5.0
13
The cooling function is managed by the following parameters:
Fan setpoints:
When cooling is operational, the fan setpoints automatically switch to the normal setpoints plus an offset if this is
configured. In the ECO, DIVA, MAC2 and QUATTRO versions, the normal fan speed setpoints are higher than the
reduced speed setpoints in order to take full advantage of the function. In the LOBBY version, a normal operation
setpoint corresponding to the night cooling setpoint will be configured.
If the air distribution network is equipped with motorised control registers (especially in LOBBY constant pressure), it is
necessary to force their opening by using the activation signal of the cooling function, otherwise the air volume will
remain blocked and the function will be of little use. A cooling fan offset can also be set if you want to ensure that you
achieve an air volume close to the maximum air volume of the machine.
Time setpoints:
Care should be taken not to overlap the normal operation time period with the cooling time period because this would
have the effect of inhibiting the cooling function over the recovery time of the two functions (the cooling activation
signal and the fan offsets will not be operational). Cooling can only be started if the time period for reduced operation is
running or if the central ventilation unit is switched off.
All of the following conditions must be met to activate the function:
■The user has authorised the cooling operation (accessible parameter)
■Fewer than 4 days have passed since the unit was operated in reduced or normal mode
■A time schedule must be active within the next 24 hours
■The daytime outdoor temperature has exceeded the set threshold (22°C adjustable)
■Normal operation, external forced operation and restart must be off (not active)
■The current time is within the permitted operating range (00:00 - 7:00, adjustable)
■The difference between the return air temperature and the outdoor temperature is insufficient (2°C adjustable with a
hysteresis of 0.5°C).
Parameter Configuration Factory setting
Authorisation to run (user condition)
Activated
Activated
Deactivated
Time range for operating authorisation
Start time (adjustable) 00:00
End time (adjustable) 07:00
Fan offset (applied to normal HS setpoints)
Supply air fan (adjustable) 0
Return air fan (adjustable) 0
Outdoor temperature threshold reached during the day (Adjustable) 22 °C
Outdoor temperature range during the night cooling period
Maximum temperature
(adjustable) 35 °C
Minimum temperature (adjustable) 14 °C
Minimum recovery temperature threshold during the night cooling
period (Adjustable) 18 °C
Return temperature difference - outdoor temperature (Adjustable) 2 °C
Blocking time of the hot outputs after night cooling (Adjustable) 180 minutes
Time between 2 test runs (Adjustable) 60 minutes
Time to check all temperature sensors (Adjustable) 180 seconds
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0

Zehnder EASY 5.0
14
When the function is activated, the machine goes through a stop and start phase. It then starts a phase of 180 seconds
(adjustable) during which the unit operates with the cooling parameters set (normal operation fan setpoint + offset if
present) in order to properly irrigate the temperature sensors and ensure that the measured values are stabilised and
reflect the current situation.
Once this has finished, the shutdown conditions are checked. If at least one of the following conditions exists, then the
unit quits the cooling function:
■The outdoor temperature is outside the permitted range:
Outdoor temperature > 35°C
Outdoor temperature <14°C
■The return air temperature is below the specified value (18°C)
■Normal operation, external forced operation and restart must be off (not active)
■The difference between the return air temperature and the outdoor temperature is sufficient (2°C adjustable)
■The end time (07:00) has been exceeded.
When night cooling has been activated, the heating outputs are deactivated 180 minutes (adjustable) after the night
cooling function has been exited, in order not to lose the accumulated energy and comfort benefits.
Example: heating can only be switched on from 08:00 if cooling was stopped at 05:00, although the end time is set to
07:00.
If the activation conditions are met again, the fan offset will only be active after a time limit of 60 minutes from the time
the cooling function was exited.
When cooling is active:
■The DO output cooling (NO) is closed. This change of state must be used to force open any registers placed on the air
distribution network (LOBBY constant pressure network)
■The normal operation fan setpoint is used and an adjustable offset (positive or negative) is applied if this is set.
10. Anti-icing function by reducing the air volume
By reducing the air volume in the supply air stream, this function prevents the temperature of the return air stream from
dropping too low, which could lead to the icing of its water vapour and thus the clogging of the exchanger.
This function can be considered when the building is heated mainly by generators whose energy cost is cheaper than if
an electric Joule heat exchanger is used to preheat the fresh air, or when there are power supply/power constraints. In
effect, the function limits the electrical power consumed by the machine, which is particularly useful in certain countries
or regions during the winter.
Access path to the function (Access level: Expert)
Step 1 →Step 2 →Step 3 →Step 4
From
screen
Area to
click Functions Protection against icing
Settings and configuration
Sensors
Alarms
PID loops
Functions
Actuators
Main menu Function settings
Protection against icing
Protection against fire
Forced operation
Cooling
Cold recovery
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0

Zehnder EASY 5.0
15
It should be noted that stopping/reducing the supply air volume and maintaining the return air volume at the nominal
value requires fresh air inlets at the windows (or any other similar device) in order to control the pressure in the building
and the minimum air volume at the return.
This function is activated when the 2 conditions below are met:
■The anti-icing sequence by bypassing the fresh air volume (see XXVII.3 Protecting the plate heat exchanger against
icing) is active
■The measured outdoor temperature is below the set threshold (-100°C factory setting, configurable value).
When the function is active, the supply air fan setpoint changes to the minimum signal value of 25% (2.5V, not
adjustable) regardless of the fan control type (ECO/DIVA/LOBBY/MAC2/QUATTRO).
To allow the supply air fan to resume normal operation, the fresh air temperature must return to above the set threshold
(+1°C) AND the fresh air bypass anti-icing function must be reset. This does not always happen instantly depending on
the PID settings.
The factory setting of the outdoor activation temperature threshold is -100°C, which makes this function inactive. To
activate it, it is necessary to change this value to about -10°C.
It is not recommended to activate this function on SMART or INFINITE machines equipped with an electric fresh air
preheating coil. This is because the fresh air volume becomes low (fan control signal at minimum) when the function is
activated, which could lead to overheating of the fresh air preheating coil.
= Possible = Not recommended — = Non-functional
If an electric heating coil is integrated in the machine, it will be deactivated for as long as the function is active in order
to avoid excessive overheating of the heating element and its immediate vicinity.
This function is not used in machines with a rotary heat exchanger.
Fan control Exchanger type Heating coil type Thermal control
ECO LOBBY MAC2 DIVA QUATTRO PLAQUE ROUE BE BC
SMART/INFINITE
(Fresh air preheating
coil)
—
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0

Zehnder EASY 5.0
16
11. Anti-fire function
11.1. General information on the function and its possible configuration
When the anti-fire function is active, it can be identified by the pictogram in the “operating mode” area of the home
page.
The anti-fire function is activated when the corresponding digital input DI is active.
It allows the machine to be forced to operate on sequences specific to the anti-fire function.
This function is inactive when the unit leaves factory and must be configured when the machine is commissioned.
The anti-fire function cannot be used to control fire dampers. The management and control of these components should
be done independently, if necessary.
When the anti-fire function is activated, the bypass control output of the plate heat exchanger is deactivated and the
fresh air is diverted from the plate heat exchanger.
Only the behaviour of the unit, fans and isolation registers can be configured when the anti-fire function is activated.
In the case of a rotary heat exchanger, the recovery sequence remains on auto if the selected operating mode allows the
machine to operate.
Access path to the function (Access level: Expert)
Step 1 →Step 2 →Step 3 →Step 4
From
screen
Area to
click Functions Protection against fire
Settings and configuration
Sensors
Alarms
PID loops
Functions
Actuators
Function settings
Protection against icing
Protection against fire
Forced operation
Cooling
Cold recovery
Main menu
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0

Zehnder EASY 5.0
17
11.2. Fire alarm (N°58)
The fire alarm has a factory setting of Class C (= warning), with a time limit of 1 second and no action.
Parameter Possible choices Details
Function activation Activated or deactivated Enables the operation or non-operation of the anti-fire
function.
Operating mode
Stop
The machine is stopped when the anti-fire function is
active. The fans are switched off immediately even
with a declared heating BE; there is no post-
ventilation.
Continue
The machine operates continuously without taking
into account the time schedules with the fan settings
below(1).
Under normal start/stop
conditions The machine operates according to the time schedule.
Supply only The supply air fan only operates according to the
corresponding setpoint below(1).
Return only The return air fan only operates according to the
corresponding setpoint below(2).
(1)Supply air fan setpoint
Auto
The fan runs at the speed/pressure/volume requested
by the time schedule. It may be at a standstill if a
shutdown phase is programmed.
100% manual output The fan runs at maximum speed regardless of the type
of control (speed/pressure/volume)
Reduced operation The fan rotates at the corresponding reduced speed/
pressure/volume.
Normal operation The fan rotates at the corresponding normal speed/
pressure/volume.
(2)Return air fan setpoint
Auto
The fan runs at the speed/pressure/volume requested
by the time schedule. It may be at a standstill if a
shutdown phase is programmed.
100% manual output The fan runs at maximum speed regardless of the type
of control (speed/pressure/volume)
Reduced operation The fan rotates at the corresponding reduced speed/
pressure/volume.
Normal operation The fan rotates at the corresponding normal speed/
pressure/volume.
Fresh air register position
setpoint
Fan function The fresh air register is forced open if the fan is
running or forced closed if it is not.
Open The fresh air register is forced open when the anti-fire
function is activated.
Closed The fresh air register is forced closed when the anti-
fire function is activated.
Exhaust air register position
setpoint
Fan function The exhaust air register is forced open if the fan is
running or forced closed if it is not.
Open The exhaust air register is forced open when the anti-
fire function is activated.
Closed The exhaust air register is forced closed when the
anti-fire function is activated.
Plate heat exchanger sequence
setpoint
Bypass open (parameter
fixed and not accessible)
When the fire function is activated, the exchanger is
bypassed.
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0

Zehnder EASY 5.0
18
*By using the save user settings function at the end of the commissioning process, a normally functional configuration
can be restored at any time.
Step Symbol
PG 5.0 Description Additional information
1Installation and electrical wiring of options (if present)
1.1 3-way valves hot / cold See installation manual
1.2 Hot / cold circulators See installation manual
1.3 Changeover thermostat See installation manual
1.4
External controls (smoke detection devices, fire detection
devices, low-speed remote order, high-speed remote order,
remote stop order, fire protection)
See installation manual
1.5 Signal reports (LOBBY night cooling, alarm reports) See installation manual
1.6 Zehnder EDT2 remote room touch control
See specific Zehnder EDT2 product
information sheet
XXXV.6 Navigation and menu access
2Controller date and time setting XXXV.6 Navigation and menu access
3Time change setting / summer winter automatic XXXV.6 Navigation and menu access
4Time period settings XXXV.6 Navigation and menu access
5Fan setpoint configuration
XXXV.6 Navigation and menu access
0
FAN CONTROL MODES
6Temperature setpoint configuration XXXV.6 Navigation and menu access
XVIII TEMPERATURE CONTROL MODES
7Wiring and setting of communication ports XXXV.6 Navigation and menu access
XVI BMS COMMUNICATION
8Setting specific functions XXXV.6 Navigation and menu access
8.1 Night cooling IX NIGHT COOLING FUNCTION
8.2 Protection against fire XI ANTI-FIRE FUNCTION
8.3 Protection against icing by reducing the supply air volume
•
ANTI-ICING FUNCTION BY REDUCING THE
SUPPLY AIR VOLUME
9Checking the correct operation and adjustment of PIDs
XXXV.6 Navigation and menu access
XXXIII HELP WITH SETTING PID
PARAMETERS
10 Save user settings* XXXV.6 Navigation and menu access
12. Commissioning procedure
The commissioning procedure can follow the following sequence of steps:
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0

Zehnder EASY 5.0
19
13. Time period settings
13.1. General
The setting of the time periods is to be adapted according to the type of occupancy in the area served by the ventilation
unit, and whether the ventilation unit should maintain thermal comfort or not. The setting of the time periods involves
combining 2 adjustable ventilation levels (reduced operation / normal operation) with 2 adjustable time periods (period 1
/ period 2) for all days of the week and for the day that is assigned to the “holiday” periods.
For each time period, it is necessary to set the start time and the end time.
Principle of timetable setting:
00:00 - 00:00 means that the period is not active
00:00 - 24:00 means that the period is permanently active
07:00 - 19:00 means that the period is active from 07:00 to 19:00
Access path to the function (Access level: Expert)
Step 1 →Step 2 →Step 3 →Step 4
From
screen
Area to
click Time periods
Main menu Time settings
Holiday calendar
Date and time
Time periods
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0
Copy from Monday
to
Friday
Copy from Monday
to
Friday
Period 1
Period 1 Period 2
Start
Start Start
StartEnd
End End
End
Monday
Monday
Period 2
Period 1 normal operation
Settings for days
of the week
Settings for holiday
periods
Period 2 normal operation
Period 1 reduced operation Period 2 reduced operation
Reduced
Reduced
Normal
Normal

Zehnder EASY 5.0
20
13.2. Priorities for time periods and external controls
Where time periods overlap, the following should be considered:
■When a reduced operation time period and a normal operation time period overlap, the normal operation time period
has priority over the reduced operation time period
■When there is no active operation, i.e. when neither the reduced nor the normal operation is active, the ventilation unit
is switched off
■If the ventilation unit is stopped, it can be started if the night cooling function is allowed to operate in the set operating
time range (00:00 - 07:00 factory setting)
■The night cooling function can only operate if the ventilation unit is:
■In reduced operation
■Stopped via time schedules (no active time schedules).
External controls have priority over time period programming. If the ventilation unit:
■Operates in the normal operation time schedule and the external forced operation in reduced operation is activated,
the ventilation unit will operate in reduced operation
■Operates in the reduced operation time schedule and the external forced operation in normal operation is activated,
the ventilation unit will operate in normal operation
■Is off (no active time schedule) and the forced running in reduced (or normal) operation is activated, the unit will
operate in reduced (or normal) operation the whole time the forced running in reduced (or normal) operation is
activated
■Is operating in the reduced (or normal) operation time schedule and the external forced operation is activated, the
ventilation unit will be switched off.
The night cooling function will only be started if:
■The time schedule that covers the cooling period is the reduced operation
■Or the ventilation unit is stopped by the time schedules (no active time schedule)
■And there is no demand for an external forced operation.
Due to the risk of internal deterioration of the fan unit and clogging of the pressure tap tubes by condensation, it is
generally not recommended to have shutdown phases, especially because:
■These shutdown phases are short and repeated
■The exhaust air is humid
■The machine is installed outdoors, in a cold region, and without isolation registers.
For these reasons, it is recommended to have at least the reduced operation period permanently active (setting 00:00 -
24:00).
The diagram below summarises the operating logic for the following time schedule setting:
Z-MASTER-V1122-CSY-INM-Zehnder Easy5.0