nilan VPL 28 User manual

VPL 28
Version: 10.00, 13-04-2015
Software-version: 2.30
User manual
CTS 602 by Nilan

Table of contents
Table of contents ............................................................................................................................ 2
Figure table .................................................................................................................................... 2
Introduction..................................................................................................................................... 3
Review of the thermometer sensors ............................................................................................... 4
CTS 602 panel ............................................................................................................................... 5
How to use the menu:................................................................................................................. 5
Review of the menus ...................................................................................................................... 6
Menus in the CTS 602 control..................................................................................................... 6
Operating mode.............................................................................................................................. 7
Main menu.................................................................................................................................. 8
Show alarms............................................................................................................................... 9
Show data................................................................................................................................. 12
User select................................................................................................................................ 13
User select 2............................................................................................................................. 14
Setting of clock.......................................................................................................................... 15
Week programme ..................................................................................................................... 16
Factory settings for the 3 weekly programs:.............................................................................. 17
Cooling ..................................................................................................................................... 19
Night Cooling ............................................................................................................................ 20
Humidity.................................................................................................................................... 21
Air exchange............................................................................................................................. 22
Air filter ..................................................................................................................................... 23
Temp. control............................................................................................................................ 24
Setting of language................................................................................................................... 25
System dimensions ...................................................................................................................... 26
Accessories/spare parts ............................................................................................................... 27
Figure table
Figure 1: Thermometer sensors...................................................................................................... 4
Figure 2: CTS 602 panel................................................................................................................. 5
Figure 3: Menu headlines ............................................................................................................... 6
Figure 4: Main menu....................................................................................................................... 7
Figure 5: Headlines in the ”Main menu” .......................................................................................... 8
Figure 6: The ”Show alarms” menu................................................................................................. 9
Figure 7: The ”Show data” menu .................................................................................................. 12
Figure 8: The ”User select" menu ................................................................................................. 13
Figure 9: The ”User select 2" menu .............................................................................................. 14
Figure 10: Setting of clock ............................................................................................................ 15
Figure 11: The ”Week program” menu .......................................................................................... 16
Figure 12: The ”Heating surface” menu ........................................................................................ 18
Figure 13: The ”Cooling” menu ..................................................................................................... 19
Figure 14: The ”Night Cooling” menu............................................................................................ 20
Figure 15: The ”Humidity" menu ................................................................................................... 21
Figure 16: The ”Air exchange” menu ............................................................................................ 22
Figure 17: The ”Air filter” menu ..................................................................................................... 23
Figure 18: The ”Temp. control” menu............................................................................................ 24
Figure 19: The ”Language” menu ................................................................................................. 25
Figure 20: System dimensions...................................................................................................... 26

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Introduction

Please control that the following documents have been delivered together with the unit:
- Directions for assembly and use
- CTS 602 directions (this document)
- Electrical chart
The purpose of this manual is to clearly show the menus and possibilities of the CTS 602 control.
This manual may describe functions that are not accessible in your unit.
PLEASE NOTE: If the system is damaged in any way, it must be inspected and repaired by li-
censed personnel.

May be subject to change page 4 of 27
Review of the thermometer sensors
Figure 1: Thermometer sensors
Explanation for figure 1:
T1- is the thermometer sensor for the fresh air and should be placed at the north side of the
building.
T2 - is the thermometer sensor for the inlet air at the fan (without heating surface).
T5 - shows the temperature of the condenser.
T6 - shows the temperature of the evaporator.
T7 - is the thermometer sensor for the inlet air after a heating surface.
T10 - is the thermometer sensor for the exhaust air in a room (accessory).
T15 - is the thermometer sensor in the CTS 602 panel.
The temperature of the sensors can be read in the “Show data” menu.

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CTS 602 panel
Use of t he CTS 600 panel :
- pr ess ESC t o go one st ep back i n t he menu
- pr ess qpt o move up or down i n a menu or t o
adj ust an act i vat ed menu
- pr ess ENTER t o act i vat e a menu
- pr ess ENTER t o conf i r m a menu
- pr ess OFF t o t ur n of f t he uni t
- pr ess ON t o t ur n t he uni t on
Figure 2: CTS 602 panel
The following is indicated by the light-emitting diode at the front of the CTS 602 panel:
Constant yellow light: the compressor is in operation
Flashing yellow: the unit is in alarm condition
The panel can show 2 lines of text with each 8 characters.
The upper line shows a guiding text.
The bottom line shows the matching values to the guiding text.
The text in the display in “on” as long as there is power to the unit and will not turn off even though
the unit is set to “off” or has not been operated for a longer period of time.
How to use the menu:
It is possible to adjust a value or a function by finding the matching menu via por q.
To activate the desired menu press ENTER.
To adjust the settings of the value press ENTER until the value flashes.
The adjustment can now be done viapq.
To save the chosen value press ENTER.
It is advisable to have the panel and/or the review of the menus near by during the reading of the
menus.
If none of the press buttons are activated for one minute the control will automatically return to the
main menu.
If you are in the middle of the programming when the control returns to the main menu all data will
be saved if they previously are saved by pressing ENTER. It is always possible to return to the
programming to continue.

May be subject to change page 6 of 27
Review of the menus
Menus in the CTS 602 control
The control will have the main menu as starting point, (the menu in the full-drawn frame). From
here it is possible to go through the other menus via pq.
Option for choosing a low ventilation level at a low outside temperature.
Main menu: displays operating status.
Press ESC to return to the main menu.
Operating mode (heat, auto, cool), temperatures, fan speed, type of unit and
software version.
Alarm display and reset.
Alarm log containing the latest16 alarms.
SHOW
ALARMS
SHOW
AUTO
>2< 19°C
USER Options: exhaust, inlet, ventilation, OFF. The function selected is activated via a
switch or pressure.
10-09-13
TM .. 12:10 Date and time settings. The time and date must be reset if the system has been
without power for more than24 hours. Summer and winter time must also be set
manually.
Weekly program can be set to ON or OFF. When the program is active, 1, 2
or 3 is displayed in the main menu.
SELECT
WEEK
PROGRAM
COOLING Option for choosing a higher ventilation level when the system is
cooling via open bypass valve.
AIR
EXCHANGE
AIR
FILTER
TEMP.
CONTROL
LANGUAGE
ENGLISH
The controls are factory set to activate a filter alarm every 90days. The alarm
is reset in the VIEW ALARMS menu.
Setting the minimum temperature required in order for the bypass valve to
close. Maximum inlet air temperature can be set for a heating element.
Select the required language: English,German,French,Swedish,
Danish,Norwegian or Finnish.
HEATING The system has a heating surface installed. The heating surface can be
chosen ON/OFF. Frost-protection is still active when OFF is chosen.
SURFACE
DATA
HUMIDITY Offers the option to set a higher/lower fan speed at a high/low humidity level
CO2The menu is only accessible when the unit has CO2-sensors
installed
NIGHT Setting of the temperature for passive cooling at night
COOLING
Figure 3: Menu headlines

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Operating mode
The main menu shows 3 different values: operating mode, ventilation step and temperature. Those
values indicate the state of the unit and are selected by the user.
The main menu is automatically shown 15 seconds after the unit is electrically connected and is
now ready to be set.
AUTO *
>2< 19°C
Ventilation step
* : the ”USER
SELECT” menu is
active
1,2,3 : week
programme
is active
L: low ventilation
step at low outdoor
temperature
Operating mode: OFF
AUTO
COOL
HEAT
Desired
roomtemperature
(5-30°C).
Figure 4: Main menu
Desired room temperature can be adjusted by pressing ENTER once. The number at °C flashes
and the value can be set via pq. The desired value must be approved by pressing ENTER once.
The operating mode can be adjusted by pressing ENTER twice. The actual mode is flashing and
can be set via pq and approved by pressing ENTER once. In “AUTO”-mode the bypass-draught
control is automatically opened or closed according to the temperature setting.
The ventilation step can be adjusted by pressing ENTER three times. The actual ventilation step is
flashing and can be set via pq and approved by pressing ENTER once.

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Main menu
The main menu is automatically shown 15 seconds after the unit is electrically connected.
” ” indicates that the menu point flashes and can be set to another value.
Use of t he CTS 600 panel :
- pr ess ESC t o go one st ep back i n t he menu
- pr ess qpt o move up or down i n a menu or t o
adj ust an act i vat ed menu
- pr ess ENTER t o act i vat e a menu
- pr ess ENTER t o conf i r m a menu
- pr ess OFF t o t ur n of f t he uni t
- pr ess ON t o t ur n t he uni t on
AUTO
>2< ”19°C”
AUTO
”>3<” 19°C
”COOLING”
>2< 19°C
”HEAT”
>2< 19°C
”AUTO”
>2< 19°C AUTO
”>2<” 19°C
ENTER ENTER
AUTO
>2< 19°C
AUTO
>2< ”5-30°C”
ENTER
In AUTO mode the unit
automatically choses
cooling or heating
according to the desired
room temperature. Week
programme is possible.
Heating according to the
desired room
temperature.
Week programme is
NOT optional.
Cooling according to the
desired room
temperature + neutral
zone (+5 °C).
Week programme is
NOT optional.
The indicated ventilation
step applies for the
exhaust.
Figure 5: Headlines in the ”Main menu”

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Show alarms
If the unit is in a state of alarm the yellow light-emitting diode on the front of the CTS 602 panel will
flash.
The ”Show alarms” menu indicates the type of alarm and the time of the alarm. This is also the
menu where the alarm should be reset.
06-05-30
TI 11:32 ENTER
06-05-30
TI 10:28
STATUS
ALARM
T1 20°C
T2 20°C
T3 0,00
T4 0,00
OUT 1-8
00000000
OUT 9-16
00000000
OUT 17-24
00000000
ALARMLOG:
The log is recovered
after power cut and
shows the 16 most
recent alarms
AL 1 is the newest.
ALARM 6
DEFROST
SHOW
ALARMS ENTER ENTER
ALARM 19
FILTER
ALARM 8
FROST
ALARMLOG AL 1:
6 DEFROST
AL 2:
19 FILTER
AL 3:
8 FROST
LIST OF ALARMS:
Shows from 0-3
active alarms. The
newest and most
critical alarms are
shown first.
The list is erased if
the power is cut.
ALARMLOGDATA:
Snapshots from the
time of the alarm.
Resetting of alarms:Alarms should
be reset individually. Only active
alarms can be reset. ALARM0
indicates that all alarms are reset.
ENTERENTER
00-00-00
TI 00:00
Figure 6: The ”Show alarms” menu

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Alarm codes are given because of a fault situation or when it is important to inform the user.
The alarms are divided into the following categories:
C
Critical
Operation is partly or completely stopped as long as the alarm is active.
W
Warning
These types of alarms will become critical if the problem is not solved quickly.
I
Informative
Normal operation is not affected. Alarm disappears when it is reset.
Alarm
code
Categori
Text in
display
Description/ cause
How to remedy alarms
00
--
--
No alarms
01
C
HARDWARE
Error in control hardware
Contact service if reset does
not help
02
C
TIMEOUT
Warning alarm W has become a
critical alarm.
Note and reset the alarm.
Contact service if alarm does
not disappear.
03
C
FIRE
Fire detecting thermostat.
Unit is stopped because the fire
detecting thermostat has been
activated.
If there has not been a fire
please contact service.
04
C
PRESSURE
High or low pressure switch in the
cooling circuit has been triggered,
probably caused by:
High pressure:
Extreme hot
Cloaked filter
Defective fan
Low pressure:
Extreme cold
Unit might have lost coolant
Cloaked filter
Defective fan
Check for errors and reset
alarms.
If you are unable to reset the
alarm or if the alarm occurs
often please contact service.
06
C
DEFROST
The unit is defrosting.
The frost protection of the heat
recovery system is insufficient
and the unit will stop. This can be
caused by extreme low outdoor
temperatures
Contact service if reset does
not help. Note the actual
sensor temperatures from
the menu “Show data” to
help service.
07
C
FROST
The water from the central heat-
ing is too cold.
Check that the heating sup-
ply for the heating surface is
OK. Reset alarm when fault
has been repaired.
08
C
FROST
One of the temperature sensors in
the unit is short circuit or defect.
Note the sensor and contact
service.
10
C
OVERHEAT
The electrical heating element is
overheated. Lack of airflow due to
cloaked filters, cloaked air intake
or defect inlet fan.
Check if air flows into the
house.
Check filter and air intake.
Reset alarm.
Contact service if the above
does not help.
11
C
AIRFLOW
Lacking inlet airflow
See alarm code 10
12
C
TERMO
Relay is triggered ventilation. This
may be due to defects in the fan
or low voltage
Contact service

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Alarm
code
Categori
Text in
display
Description/ cause
How to remedy alarms
15
W
ROOM LOW
When room temperature drops
below 10°C the unit will stop in
order to protect the house from
further cooling down. The function
is useful when the house is not
occupied and the main heating has
stopped.
Heat up the house and
reset the alarm
16
I
SOFTWARE
Error in software
Contact service
17
I
WATCHDOG
Error in software
Contact service
18
I
CONFIG
Parts of the programming are lost
and can be caused by a longer
period of power failure or lightning.
The unit will keep on operating on
standard programming.
Reset alarm
Re-programme the week
programme.
Contact service if the unit
does not operate as be-
fore. Supplementary
programs can be lost.
Only service can access
the supplementary pro-
grams and menus.
19
I
FILTER
The filter guard is set to give alarm
when a pre-set period of time has
occurred
Clean /replace filter and
reset alarm
21
I
POWER
Occurs if power has been cut off for
a longer period of time
The week programme
should be checked and
adjusted if necessary.
Reset alarm.
22
I
T AIR
The pre-set temperature of the inlet
air cannot be reached
Set a lower air inlet tem-
perature and reset alarm.
27-57
C
Tx KURZ
One of the temperature sensor of
the device is shorted or defec-
tive.Tx = +99 °C
Please note which sensor
T x, there is shorted, and
contact the customer ser-
vice.
28-58
C
Tx OFFEN
One of the temperature sensor of
the device is disconnected or defect
Tx= -40 ° C
Please note which sensor
T x, there is interruped,
and contact the customer
service.
71
I
DFR EXCH
The maximum defrosting time for
the counter flow heat exchanger
has been exceeded. This could be
due to the fact that the system has
been exposed to very low tempera-
tures.
Contact our after sales
department if resetting the
alarm does not help.
If possible, inform the after
sales department of the
current working tempera-
ture from the menu VIS
DATA (SHOW DATA).
72
I
EVAP LOW
Abnormally low evaporator temper-
ature
Check supply air valve
92
I
PRESET
Error by writing or input of the elec-
trician’s adjustments
Contact service.

May be subject to change page 12 of 27
Show data
The actual operation data can be read in the ”Show data” menu.
See review of thermometer sensors at page 5.
SHOW
DATA
FRESHAIR
T1 40°C
STATUS
HEATING
PANEL
T15 20°C
INLET
T7 50°C
EXTERNAL
T10 9°C
Room temperature
recorded by T15
(sensor in CTS 600
control panel).
The software version
used by the system.
The software
version used by
the controls.
INLET
FLOW 3
SOFTWARE
1 2.21
EXHAUST
FLOW 3
EVAP
T6 40°C
SOFTWARE
2 1.02
ENTER
COND
T5 25°C
TYPE
VPM/28EC
T10 is an external sensor that can be
installed in an exhaust fitting in the
sitting area. T10 can be chosen as a
controlling room sensor in the service
menu.See the installation instruction
For systems without
heating element, T2 is
shown. For systems
with heating element,
T7 is shown.
HUMIDITY %
100
WATER
T9 25°C
Figure 7: The ”Show data” menu

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User select
The menu CUSTOM OPTIONS overrides the operating mode of the main menu by activating an
external switch.
”VENTILAT”: There is a possibility here to run with a higher or lower speed on the air exhaust and
air inlet for a limited amount of time. The external pressure will activate the function. The function
has high priority.
”exhaust” and ”inlet”: These two options increase or reduce the velocity of the exhaust or inlet air
respectively for a limited period of time. The remaining functions of the operating mode remain
unaltered. An external switch activates the timer function.
Another external switch ensures that the fans remain at the desired ventilation level until the switch
is turned off.
”extend”: This option controls the velocity of the exhaust and inlet air and can be used to change
the temperature of the inlet air for a limited period of time. An external switch activates the timer
function.
“OFF”: Deactivates the external switch.
”ext offs”: Provides the possibility of choosing an afterflow time and changing the set point in exter-
nal rooms.
Use of the CTS602 panel:
- press ESC to go one step back in the menu
- press qpto move up or down in a menu or to adjust an
activated menu
- press ENTER to activate a menu
- press ENTER to confirm a menu
- press OFF to turn off the unit
- press ON to turn the unit on
Time and speed must
be set in the same
way as described
under SELECT
EXTEND.
Required period in
which the selected
function is to remain
operative: stated in
hours and minutes.
Max 8 hours.
Switches user option
off.
Required ventilation
step: 1-4.
OFF allows the system
to be shut down via an
external switch.
TIME
FLOW
ENTER ENTER
TEMP
TIME 00:00
FLOW >4<
TEMP 23
ENTER
ENTER
ENTER
”00:00"
”OFF”
ENTER
ENTER
ENTER
°C
”>4<”
”23" °C
SELECT
SELECT
SELECT
SELECT
”EXTEND”
”INLET”
”EXHAUST”
SELECT
”EXTEND”
USER
SELECT
Required room temperature
(5-30°C).
T15 is the temperature sensor to
be used to control the system.
”EXT OFFS” ENTER
SELECT Choose the
afterrunning and
displacement of
the setpunkt, for
externak heating.
See SELECT
EXTEND
”VENTILAT” ENTER
SELECT
Possibility to run at
a higher or lower
rate. High priority.
Figure 8: The ”User select" menu

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User select 2
User select 2 as user select
Time and speed must
be set in the same
way as described
under SELECT
EXTEND.
Required period in
which the selected
function is to remain
operative: stated in
hours and minutes.
Max 8 hours.
Switches user option
off.
Required ventilation
step: 1-4.
OFF allows the system
to be shut down via an
external switch.
TIME
FLOW
ENTER ENTER
TEMP
TIME 00:00
FLOW >4<
TEMP 23
ENTER
ENTER
ENTER
”00:00"
”OFF”
ENTER
ENTER
ENTER
°C
”>4<”
”23" °C
SELECT
SELECT
SELECT
SELECT
”EXTEND”
”INLET”
”EXHAUST”
SELECT
”EXTEND”
USER
SELECT
Required room temperature
(5-30°C).
T15 is the temperature sensor to
be used to control the system.
”EXT OFFS” ENTER
SELECT Choose the
afterrunning and
displacement of
the setpunkt, for
externak heating.
See SELECT
EXTEND
”VENTILAT” ENTER
SELECT
Possibility to run at
a higher or lower
rate. High priority.
Figure 9: The ”User select 2" menu

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Setting of clock
In case of power cut the clock will function for at least 24 hours. If the time function is lost there will
be a alarm.
Changing to daylight saving time has to be done manually.
” ” indicates that the menu point flashes and can be set to another value.
Use of t he CTS 600 panel :
- pr ess ESC t o go one st ep back i n t he menu
- pr ess qpt o move up or down i n a menu or t o
adj ust an act i vat ed menu
- pr ess ENTER t o act i vat e a menu
- pr ess ENTER t o conf i r m a menu
- pr ess OFF t o t ur n of f t he uni t
- pr ess ON t o t ur n t he uni t on
Is only shown the first
time after setting up
the time function.
06-05-30
TI 12.10 YEAR 06 ENTERENTER YEAR ”06"
MONTH
”05"
Seconds are being reset
when minutes are adjusted
MONTH 05
DAY 30
WEEK
DAY 2
HOUR 12
MINUTE 10
DAY
”30"
HOUR
”12"
MINUTE
”10"
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
Figure 10: Setting of clock

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Week programme
The unit is equipped with 3 standardized week programmes. See page 17.
Anlægget er fra fabrikken indstillet til program 1.
In addition to these programmes it is possible to programme your own week programme which can
be one of the standard programmes with minor alterations.
” ” indicates that the menu point flashes and can be set to another value.
Use of t he CTS 600 panel :
- pr ess ESC t o go one st ep back i n t he menu
- pr ess qpt o move up or down i n a menu or t o
adj ust an act i vat ed menu
- pr ess ENTER t o act i vat e a menu
- pr ess ENTER t o conf i r m a menu
- pr ess OFF t o t ur n of f t he uni t
- pr ess ON t o t ur n t he uni t on
Once settings have been made for
Monday , the values can be copied
to any other day the same settings
are to apply using in the copy
function.
System operation in
accordance with main
menu settings
”PROG 1"
MO1 06.00
>3 < 21°C
”CLEAR”
TU1 06.00
>3 < 21°C
MO TU
COPY
ENTER
ENTER
ENTER
”PROG 2"
MO2 08.00
>1 < 17°C
”PROG 3"
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER ENTER
MO TU
”COPY” TU WE COPY
TU2-6
SELECT
OFF ENTER ENTER
MO4-6
MO3 AUS
>1 < 17°C
PROG 1
WEEK
PROGRAM SELECT
”OFF”
SELECT
SELECT
SELECT
SELECT SELECT
Here it is possible to make your own
programme or adjust one of the
standard programmes. If there is more
than one function at the same time only
the last one is active.
Here it is possible to
chose one of the 3
standard programmes.
The 3 programmes can
be altered but not deleted.
The original programme
can always be found.
Here it is possible to delete all
user made programmes. The unit
will continue in AUTO mode
without any week programme.
Figure 11: The ”Week program” menu

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Factory settings for the 3 weekly programs:
Program 1 is suitable for the working family
Program 2 is suitable for the non-working family
Program 3 is suitable for offices
Program
Week day
Function
Time
Ventilation
Temperature
Program 1
Monday -
Friday
1
2
3
4
6.00
8.00
15.00
22.00
3
1
3
1
21
21
21
21
Saturday -
Sunday
1
2
8.00
23.00
3
1
21
21
Program 2
Monday -
Sunday
1
2
8.00
23.00
3
1
21
21
Program 3
Monday -
Friday
1
2
7.00
16.00
3
OFF
21
21
MO 1 08.00
>1< 17°C
Time of program step activation.
If a program step should not be used
OFF should be chosen.
(OFF is located instead of 24.00)
Required room
temperature.
Week
day.
Program step.
6 program steps are
available each day.
Fan speed.
Weekly program settings

May be subject to change page 18 of 27
Heating surface
The menu HEATING SURFACE is only accessible when the system has a heating surface in-
stalled and when the control has been set up to a heating surface in the SERVICE MENU.
” ” indicates that the menu point flashes and can be set to another value.
Use of t he CTS 600 panel :
- pr ess ESC t o go one st ep back i n t he menu
- pr ess qpt o move up or down i n a menu or t o
adj ust an act i vat ed menu
- pr ess ENTER t o act i vat e a menu
- pr ess ENTER t o conf i r m a menu
- pr ess OFF t o t ur n of f t he uni t
- pr ess ON t o t ur n t he uni t on
HEATING
SURFACE SELECT ON
SELECT
”OFF”
SELECT
”ON”
ENTER ENTER
ENTER
ENTER
When a heating surface is
installed T2 is replaced
with T7, which is the
sensor placed in the inlet
at the heating surface.
If you wish to disconnect the
heating surface this position should
be chosen.
The frost-protection is still active
and T7 is the active temperature
sensor for the inlet air.
Figure 12: The ”Heating surface” menu

May be subject to change page 19 of 27
Cooling
The ”Cooling” menu enables you to chose at which temperature cooling should be activated ac-
cording to the room temperature.
” ” indicates that the menu point flashes and can be set to another value.
Use of t he CTS 600 panel :
- pr ess ESC t o go one st ep back i n t he menu
- pr ess qpt o move up or down i n a menu or t o
adj ust an act i vat ed menu
- pr ess ENTER t o act i vat e a menu
- pr ess ENTER t o conf i r m a menu
- pr ess OFF t o t ur n of f t he uni t
- pr ess ON t o t ur n t he uni t on
COOLING TEMP
SET +3 TEMP ”SET +3”
ENTER ENTER ENTER
SET: the chosen temperature
in the main menu.
+5: allows cooling via
compressor 5 °C above
the chosen roomtemperature
The value can be set to:
OFF, 0, +1, +2, +3,+4,+5,+7,+10.
VENTILAT
HIGH OFF
Here it is possible to chose
high ventilation step when
cooling.
The value can be set to:
OFF, 2, 3, 4.
VENTILAT
HIGH ”OFF”
ENTER ENTER
Figure 13: The ”Cooling” menu
Example : Desired room temperature in main menu = 21°C
Cooling set = 5°C
Starting of compressor, cooling = 26°C

May be subject to change page 20 of 27
Night Cooling
The NIGHT COOLING menu makes it possible to select passive night cooling, provided that the
outdoor temperature on the day before has exceeded the day temperature limit set in the NIGHT
COOLING menu for at least one hour.
During the night cooling period, the compressor cooling is suspended and the room setpoint is
lowered to the temperature set in the NIGHT COOLING menu.
The limit set for the minimum intake temperature is not observed during night cooling, but the sys-
tem may run compressor heating if the room temperature falls below the night cooling setpoint.
No special account is taken of whether the room temperature is above or below the outdoor tem-
perature, i.e. whether a cooling effect from the outdoor air can actually be achieved.
When the night cooling period is over, the system will run as normal again, with compressor heat-
ing and cooling according to the normal setpoint.
Outdoor temperature as requirement NIGHT COOLING
New ROOM SET for NIGHT COOLING
Outdoor temperature as
requirement NIGHT COOLING
OFF, 20….40°C
DAY TEMP
25 °C ENTER
NIGHT
COOLING ENTER ENTER
ENTER ENTER
DAY TEMP
”25 °C”
”18 °C”
ROOM SET
18 °C
New ROOM SET for NIGHT
COOLING
OFF, 20….40°C
ROOM SET
Figure 14: The ”Night Cooling” menu