nilan Combi 302 Polar Top User manual

USER MANUAL
CTS602 BY NILAN
Combi 302 Polar Top (English)
Version 2.21 - 30.05.2018

TABLE OF CONTENTS
Safety
Power supply .................................................................................................................................................................................................................................................................. 3
Disposal............................................................................................................................................................................................................................................................................................. 3
Ventilation system .................................................................................................................................................................................................................................................. 3
Heatpump .......................................................................................................................................................................................................................................................................... 3
Quick guide
Control panel............................................................................................................................................................................................................................................................................... 4
Functions ............................................................................................................................................................................................................................................................................ 4
Operating mode ...........................................................................................................................................................................................................................................................5
Menu list............................................................................................................................................................................................................................................................................... 6
Main menu ......................................................................................................................................................................................................................................................................... 7
View alarms ..................................................................................................................................................................................................................................................................... 8
Alarm list .............................................................................................................................................................................................................................................................................9
Show data .......................................................................................................................................................................................................................................................................11
User select...................................................................................................................................................................................................................................................................... 12
User select 2................................................................................................................................................................................................................................................................. 13
Setting clock ................................................................................................................................................................................................................................................................14
Weekly programme ............................................................................................................................................................................................................................................. 15
Week program ........................................................................................................................................................................................................................................................... 16
Heating surface ....................................................................................................................................................................................................................................................... 17
Bypass operation ...................................................................................................................................................................................................................................................19
Cooling ............................................................................................................................................................................................................................................................................... 19
Humidity .......................................................................................................................................................................................................................................................................... 20
CO 2 ....................................................................................................................................................................................................................................................................................... 21
Air exchange ................................................................................................................................................................................................................................................................22
Air filter ............................................................................................................................................................................................................................................................................ 23
Temp. control ............................................................................................................................................................................................................................................................. 24
Setting language .....................................................................................................................................................................................................................................................25
General details
Unit type....................................................................................................................................................................................................................................................................................... 26
Product description .............................................................................................................................................................................................................................................26
Overview of temperature sensors .....................................................................................................................................................................................................27
Service and maintenance
Bypass function .......................................................................................................................................................................................................................................................28
Humidity control .....................................................................................................................................................................................................................................................28
Regular maintenance ........................................................................................................................................................................................................................................ 29
External cleaning ....................................................................................................................................................................................................................................................29
Water trap ......................................................................................................................................................................................................................................................................29
Filter replacement ................................................................................................................................................................................................................................................ 29
Illustration of filter change .........................................................................................................................................................................................................................30
Heat exchanger ........................................................................................................................................................................................................................................................31
Service............................................................................................................................................................................................................................................................................................ 32
Annual service .......................................................................................................................................................................................................................................................... 32
Internal cleaning ..................................................................................................................................................................................................................................................... 32
Check the air intake and outlet .............................................................................................................................................................................................................. 32
Check ventilation ducts .................................................................................................................................................................................................................................. 32
The heat pump .......................................................................................................................................................................................................................................................... 32
Product data
Declaration of compliance ........................................................................................................................................................................................................................... 33
2

Safety
Power supply
CAUTION
Always disconnect mains electricity to the unit if a fault occurs which cannot be rectified via the
control panel.
CAUTION
If a fault occurs on the electricity-conducting elements of the unit, always contact an
authorised electrical installer to rectify the fault.
CAUTION
Always disconnect mains electricity to the unit before opening the doors, e.g. for installation,
inspection, cleaning and filter change.
Disposal
Ventilation system
Nilan units mainly consist of recyclable materials. They should therefore not be
disposed of with household refuse. Take them to your local recycling centre.
Heatpump
Concerning disposal of units with heat pumps, it is important to contact the local
authorities for information about correct handling of these. The heatpump
contains the refrigerant R134a, which is harmful to the environment if not
handled correctly.
Combi 302 Polar Top (English) BY NILAN
3

Quick guide
Control panel
Functions
The CTS602 control panel offers the following functions:
1. Light diode Constant yellow light:
Flashing yellow light:
Compressor operation
The unit is in alarm mode
2. Text field Text is shown on 2 lines, each of 8 characters.
The upper line shows a help text.
The lower line shows the related setting values for the help text.
3. ESC To go to the main menu
4. ▲ To change the value
5. ▼ To change the value
6. ENTER To activate and save the chosen value
7. OFF To switch off the unit
8. ON To switch on the unit
If no button is pressed for a period of a minute, the control system will automatically return to the main
menu.
If you are programming when the control system returns to the main menu, all data will be saved, but
only if you previously have saved them by pressing ENTER . Flashing values and text will NOT be saved.
It is always possible to go back to your programming and resume from where you left off.
4

Operating mode
AUTO */1/L
>2< 19°C
4
21
3
The display on the control panel provides information about unit operation:
1. Shows the operating mode: Auto / Heating / Cooling
2. Shows: * = User option active
1-2-3 = Weekly programme active
L =Low-level operation active (humidity low)
3. Shows the set fan speed.
4. Shows the desired room temperature (not actual room temperature)
The desired room temperature can be changed by pressing ENTER once. The figure next to °C will flash,
and the temperature can be now be changed using ▲▼. The desired temperature must be confirmed by
pressing ENTER
The operating mode can be changed by double-pressing ENTER . The current mode will flash and can
now be changed using ▲▼ and confirmed with ENTER . In Auto mode, the bypass damper opens and
closes automatically, depending on temperature settings. Cooling indicates that the bypass damper
will open and heating indicates that the bypass damper is closed.
The fan speed can be changed by pressing ENTER three times. The current fan speed will flash and can
now be changed using ▲▼ and confirmed with ENTER .
Combi 302 Polar Top (English) BY NILAN
5

Menu list
SHOW
ALARMS
AUTO W/ 1
>2< 19°C
16.05.06
TM 12:10
WEEK
PROGRAM
INLET
HEATING
COOLING
HUMIDITY
CO2
AIR
EXCHANGE
AIR
FILTER
TEMP.
CONTROL
LANGUAGE
ENGLISH
SHOW
DATA
USER
SELECT
USER
SELECT 2
Displaying and resetting alarms. Alarm log with the latest 16 alarms.
Operating mode (heating, auto, cooling), temperatures, fan speed and software
version.
Main menu: Shows operating status. Press ESC to return to the main menu.
Select: Extraction, intake, ventilation and OFF. The function selected is activated
via switch or button. (See assembly instructions)
Same function as User selection. The menu is accessible when the option is
selected. (See assembly instructions)
Setting clock. If the unit has no power for more than 24 hours, the clock must be
set. Switch between summer and winter time manually.
Week program can be activated. ON/OFF If the week program is active "1, 2 or 3”
are shown in the main menu.
If the unit is selected with a heater, you can choose between supply min./max
and curve compensation.
Setting intake temperature for cooling via bypass damper.
Higher and/or lower fan speeds can be set in the event of high/low humidity.
Higher ventilation level can be set in the event of high CO2levels. Menu only
shown if CO2sensors are fitted.
Low ventilation level in the event of low outdoor temperature can be selected.
Default setting gives filter alarm with an interval of 90 days. Reset alarm in the
"SHOW ALARMS" menu
Setting minimum temperatures for supply air.
Select language: English, German, French, Swedish, Danish, Norwegian, Finnish,
Czech and Polish
The control unit is always in the main menu by default (menu in the heavy frame). Use ▲▼ to scroll
through the other menus.
6

Main menu
AUTO
>2<
19°C
ENTER
”AUTO”
>2<
19°C
ENTER
AUTO
”>2<”
19°C
ENTER
AUTO
>2<”
19°C”
AUTO
>2<”
19°C”
”COOL”
>2<
19°C
AUTO
”>3<”
19°C
”HEAT”
>2<
19°C
2
1
3
4
1. "AUTO" >2< 19°C The unit automatically selects cooling or heating mode in relation to the
room temperature set.
2. "COOL" >2< 19°C No heating from e.g. comfort heater.
3. "HEAT" >2< 19°C No cooling - i.e. no bypass open.
4. AUTO ">2<" 19°C Shows the ventilation level given that can be changed.
The main menu will be displayed automatically approx 15 seconds after power has been connected.
Menu points flashing are shown by " ".
Combi 302 Polar Top (English) BY NILAN
7

View alarms
AUTO
>2<
19°C
ENTER
16-05-06
FR 11:32
ENTER
00-00-00
FR 00:00
ENTER
ENTER ENTER
ALARM 71
DEFROST
SHOW
ALARMS
ALARM 19
FILTER
ALARM 7
FROST
ALARMLOG AL 1: 71
DEFROST
AL 2: 19
FILTER
AL 3: 7
FROST
16-05-06
FR 11:32
STATUS
ALARM
T1 20°C
T2 20°C
OUT 1-8
00000000
OUT 9-16
00000000
OUT 17-24
00000000
T3 0,00
T4 0,00
2
1
3
4
1. Alarm reset Alarms can be reset individually (inactive alarms only). When the display
shows ”Alarm 0 None” all alarms have been reset.
2. ALARM 19 FILTER Shows from 0-3 active alarms. The newest and most critical alarms are shown
first. The list will be deleted in the event of power outage.
3. ALARM LOG Restored after power outage. Shows the 16 most recent alarms. AL 1 is the
newest.
4. T3 0.00 T4 0.00 Alarm log data shows data from the time of the alarm.
When the unit is in alarm mode, the yellow diode on the CTS 602 control panel will flash.
The SHOW ALARMS menu shows the unit's alarm status and the time of the alarm. Alarms can also be
reset in this menu.
8

Alarm list
Alarm codes are given as a result of a fault or when important information should be provided to the
user.
Alarms fall into the following categories:
C Critical: Running or partially stopped as long as the alarm is active.
W Warning: Becomes critical if the situation is not improved within a reasonable period.
I Informative: Normal operation not affected. The alarm will disappear when the user cancels it.
Alarm code Category Display text Description / cause Fault correction
0 -- -- No alarm
1 C HARDWARE Fault in control system hardware Contact service if cancellation
does not help
2 C TIMEOUT Warning alarm (W) has become a
critical alarm
Note alarm and reset.
Contact service if alarm does not
disappear
3 C FIRE Fire thermostat. Units stopped
because fire thermostat is active
If there has been no fire, contact
service
4 C PRESSO
High pressure switch in the cooling
circuit has been triggered,
probably caused by:
- Extreme hot
- 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.
6 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.
8 C T xSHORT One of the temperature sensors in
the unit is short circuit or defect.
Note which sensor, T x, has
shortcircuited, e.g. T1 short and
contact service
9 C T xOPEN One of the temperature sensors
has been disrupted or is faulty
Note which sensor, T x, has been
disrupted, e.g. T1 disrupt and
contact service
10 C OVERHEAT
Electrical heater overheated.
Insufficient air flow due to e.g.
blocked filters, blocked air intake
or faulty intake fan
Check air is being blown into the
home.
Check filter and air intake.
Reset alarm.
Contact service if the above does
not help
11 C AIRFLOW Insufficient airflow at intake.
See alarm code 10 See alarm code 10
15 W ROOM LOW
When the room temperature is
under 10°C the unit will stop to
avoid further cooling. This can be
for a period when the house is
unoccupied and the heating is
switched off.
Heat up the house and reset alarm
Combi 302 Polar Top (English) BY NILAN
9

Alarm code Category Display text Description / cause Fault correction
16 I SOFTWARE Fault in control system program Contakt service
17 I WATCHDOG Fault in control system program Contakt service
18 I SET
Part of the program setup lost.
Can be due to long-term power
outage or lightning strike.
The unit will continue to run on
standard setup
Reset alarm.
Program week program as
required.
Contact service if the unit is
running unsatisfactorily or as
before, as any sub-programs can
be lost. (sub-programs are only
accessible by service)
19 I FILTER
Filter sensor set for X days for
check/replacement of filter (30,
90, 180, 360 days). Standard
setup is 90 days
Clean/replace filter.
Reset alarm.
21 I SET TIME Occurs in the event of power
outage
Week timer settings must be
checked and set if required.
Reset alarm
22 I T AIR
Target heating of intake air not
possible (only applies if comfort
heater fitted). Comfort heater and
unit cannot raise the temperature
to target.
Set lower target intake
temperature.
Reset alarm
71 I EXCH DEF
Max. defrosting time exceeded for
counterflow exchanger. Can be
because the unit has been exposed
to low temperatures
Contact service if cancellation of
alarm does not help. Note current
operating temperatures from the
SHOW DATA menu as an aid to
service
72 I EVAP LOW Abnormally low evaporator tem-
perature
Check discharge air valve and
extract air valve
91 I OPT IO Option PCB missing Contakt service
92 PRESET Error when entering or loading
installer's settings Contakt service
10

Show data
STAUS
HEATING
BYPASS
OPEN
PANEL
T15 20°C
EXSTERNAL
T10 21°C
HUMIDITY
100%
CO2
566ppm
INLET
T2 21°C
FRESHAIR
T1 9°C
OUTL EXH
T4 5°C
COND
T5 40°C
INLET
FLOW 2
EVAP
T6 26°C
EXHAUST
FLOW 2
SOFTWARE
1 2.34
SOFTWARE
2 1.04
TYPE
COMBI302
ENTER
SHOW DATA
1
2
3
4
6
5
7
1. BYPASS OPEN Bypass-damper position
2. PANEL T15 20°C Room temperature measured at T15 (sensor in CTS602 panel)
3. EKSTERNAL T10 21°C T10 is an external sensor that can be fitted in an extraction fitting in the
accommodation zone. T10 can be selected as the governing room
sensor in the service menu
(See installation instructions).
4. CO 2566ppm In units with CO 2 sensor, CO 2 concentration is shown.
5. SOFTWARE 1 2.33 Software version installed on the unit.
6. SOFTWARE 2 1.04 Software version installed on control panel.
7. TYPE COMBI302 Unit type.
Actual operating data can be read off under the SHOW DATA menu.
Combi 302 Polar Top (English) BY NILAN
11

User select
ENTER
ENTER
ENTER
ENTER
SELECT
EXTEND
TIME
00:00
FLOW
>4<
TEMP
23°C
TIME
”00:00”
FLOW
”>4<”
TEMP
”23°C”
ENTER ENTER
SELECT
”EXHAUST”
SELECT
”EXT OFFS”
SELECT
”VENTILAT”
ENTER
ENTER
ENTER
SELECT
”OFF”
SELECT
”EXTEND”
USER
SELECT
ENTER
1
2
3
SELECT
”INLET”
5
6
4
7
1. TIME 00:00 Required period in which the selected function is to remain operative,
stated in hours and minutes. Max. 8 hours.
2. FLOW <4> Required ventilation level: 1-4. OFF allows the system to be shut
down via an external switch.
3. TEMP 23°C Required room temperature (5-30°C). T15 is the controlling sensor.
4. SELECT "INLET" "EXHAUST" Time and speed must be set in the same way as described under
SELECT EXTEND.
5. SELECT "EKS OFFS" The temperature is added or subtracted to/from the set point.
Choose the afterrunning and displacement of the set point for
external room heating. Selected in the same way as shown under
SELECT EXTEND.
6. SELECT "VENTILAT" Possibility to run a higher or lower speed. High priority.
7. SELECT "OFF" User selection deactivated.
The menuUSER SELECT overrides the operating mode of the main menu by activating an external
switch.
12

User select 2
ENTER
ENTER
ENTER
ENTER
SELECT
EXTEND
TIME
00:00
FLOW
>4<
TEMP
23°C
TIME
”00:00”
FLOW
”>4<”
TEMP
”23°C”
ENTER ENTER
SELECT
”EXHAUST”
SELECT
”EXT OFFS”
SELECT
”VENTILAT”
SELECT
”C HOOD”
ENTER
ENTER
ENTER
SELECT
”OFF”
SELECT
”EXTEND”
USER
SELECT 2
ENTER
ENTER
1
2
3
SELECT
”INLET”
5
7
6
4
8
1. TIME 00:00 Required period in which the selected function is to remain operative,
started in hours and minutes. Max. 8 hours.
2. FLOW <4> Required ventilation level : 1-4. OFF allows the system to be shut
down via an external switch.
3. TEMP 23°C Required room temperature (5-30°C). Panel sensor T15 is the
controlling sensor.
4. SELECT "INLET" "EXHAUST" Time and speed must be set in the same way, as described under
SELECT EXTEND.
5. SELECT "EXT OFFS" The temperature is added or subtracted to/from the set point.
Choose the afterrunning and displacement of the set point for
external room heating. Selected in the same way as shown under
SELECT EXTEND.
6. SELECT "VENTILAT" Possibility to run a higher or lower speed. High priority.
7. VALG "C HOOD" RE7: Close switch for controlling of hood damper motor.
8. SELECT "OFF" User selection deactivated.
The menu USER SELECT 2 is used as USER SELECT. (only shown when option PCB is fitted)
Combi 302 Polar Top (English) BY NILAN
13

Setting clock
WEEK
DAY 6
HOUR
12
MINUTE
10
HOUR
”12”
MINUTE
”10”
ENTER
ENTER
ENTER
1
2
YEAR
16
MONTH
05
DAY
07
YEAR
”16”
MONTH
”05”
DAY
”07”
ENTER ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
16-05-06
FR 12.10
1. WEEK DAY 2 Shown first time only after setting up timer function, Monday = 1.
2. MINUTE "10" Seconds are reset when the minute value is adjusted.
In the event of power outage the clock will work for at least 24 hours. If the time function is lost, an
alarm will show: "SET TIME".
Switch between summer and winter time manually.
Menu points flashing are shown by " ".
14

Weekly programme
MO 1 08.00
>1< 17°C
5
321
4
1. Mo Day of week.
2. 1 Function step. There are 6 function steps for each day.
3. 08.00 Time for activation of function step.
4. >1< Fan speed.
5. 17 °C Selected temperature.
The unit has 3 weekly programmes. The unit's default setting is OFF.
There is also an option for programming your own weekly programme. This could be one of the
standard programmes, but with small changes.
Flashing menu items are designated with " ".
Default setting for the 3 weekly programmes:
• Programme 1 is for working families.
• Programme 2 is for stay-at-home families.
• Programme 3 is for businesses.
Programme Day of week Function Time Fan speed Temperature °C
Programme 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
Programme 2 Monday - Sunday 1
2
8.00
23.00
3
1
21
21
Programme 3 Monday - Friday 1
2
7.00
16.00
3
OFF
21
21
Combi 302 Polar Top (English) BY NILAN
15

Week program
ENTER
ENTER
ENTER
ENTER
SELECT
”OFF”
MO 1 06.00
>3 < 21°C
MO 2 08.00
>1 <17°C
MO 3 OFF
>1 <17°C
MO 4-6
MO ------> TU
COPY
TU 1 06.00
>3 <21°C
TU 2-6
SELECT
”PROG2”
SELECT
”PROG3”
SELECT
”CLEAR”
SELECT
OFF
ENTER ENTER
ENTER
TU ------> WE
COPY
MO ------> TU
”COPY”
ENTER ENTER
WEEK
PROGRAM
1
4
3
5 5 5
ENTER
ENTER
ENTER
SELECT
”PROG1” SELECT PROG1
2
1. SELECT OFF Unit mode with regard to main menu.
2. SELECT "PROG1-2-3" 1 of 3 week programs can be selected here. A week program can be selected
as active and customised to the user's requirements.
3. SELECT "CLEAR" All functions in the program selected are set to OFF here. The unit will
continue in AUTO mode with active week program.
4. MO 1 08.00 >1< 17°C A custom week program can be composed here, or the values of another
program revised. If several functions are coded in at the same time, only the
last/lowest function will be activated.
5. MO----> TU/WE COPY When values have been entered for the Monday program, it can be copied to
the other days with the same requirement via the Copy function.
16

Heating surface
MODE
”HEATING”
MODE
”OFF”
ENTER ENTER ENTER
ENTER
INLET
HEATING MODE
DEMAND
INLET
MIN 20°C
INLET
MAX 40°C
CURVE
10
OFFSET
CUR 0°C
OFFSET
T15 0°C
DELAY
10 MIN
1
2
3
4
5
6
7
1. MODE "DEMAND" Select central heating mode "HEATING", "OFF" og "DEMAND"
When the channel heating function is set to HEAT, the regulation is
constantly controlled from the inlet SET point from the curve function.
When the channel heating function is set to DEMAND, the regulation is
controlled by the selected SUPPLY MIN temperature, when there is no
room heating requirement. When there is a room heating requirement,
the curve temperature is used - as in setting HEAT.
2. INLET "MIN 20°C" Minimum limit for supply air temperature (Channel heater) between 5
and 50 °C.
3. INLET"MAX 40°C" Maximum limit for supply air temperature (Channel heater) between 5
and 50 °C.
4. CURVE "10" The weather compensation curve can be set between 1 and 10 (see
illustration).
5. OFFSET CUR"0°C" Supply air temperature can be changed in the weather compensation
curve (-15 to + 10 °C).
6. OFFSET T15 "0°C" Rumtemperaturen kan BEHOV forskydes fra rummets setpunkt til et
lavere setpunkt (0 til +2°C).
7. DELAY "10 MIN" Delayed activation in DEMAND operation from 0-30 min.
Combi 302 Polar Top (English) BY NILAN
17

It is possible to retrofit an electrical comfort heater. The heater must be activated in the CTS 602
control menu to work with the unit.
After customized with a heating element is T7 supply sensor.
Weather compensation curve
0
10
20
30
40
50
60
70
80
90
100
-20 -17 -14 -11
-8 -5 -2
1 4 7
10 13 16 19
Outdoor temperature°C
K1
K2
K3
K4
K5
K6
K7
K8
K9
K10
Supply air temperature °C
The desired heating temperature is set to an outdoor temperature of
-20°C, and +20°C.
On the basis of these temperatures, the central heating temperature is
determined by interpolating between the points for a given outside
temperature.
18

Bypass operation
AUTO
>2<
19°C
ENTER
VENTILAT
HIGH ”2”
ENTER ENTER
VENTILAT
HIGH 2
COOLING
1
1. VENTILAT HIGH "2" Select between levels 2, 3, 4 and OFF.
The COOLING menu allows selection of the unit automatically running at a higher/highest ventilation
level for low bypass mode.
Bypass operation is used when there is no need for heat recovery.
Cooling
2
TEMP
SET +5°C TEMP SET ”+5°C”
VENTILAT
HIGH ”OFF”
ENTER ENTER
VENTILAT
HIGH OFF
ENTER
COOLING
1
1. TEMP "SET +5°C" Indicates when refrigeration via compressor operation must be activated
in relation to the set room temperature. The value can be set to +1, +2, +3,
+4, +7, +10°C and OFF.
1. VENTILAT HIGH "OFF" Here it is possible to chose high ventilation step when cooling. The value
can be set to: 2, 3, 4 and OFF.
In the COOLING menu it is possible to cool the air with active cooling via compressor operation.
Combi 302 Polar Top (English) BY NILAN
19

Humidity
TIME
60 MIN
ENTER
4
HUMIDITY
LOW >1<
LOW
30%
HUMIDITY
HIGH >4<
HUMIDITY
LOW >”1”<
LOW
”30%”
HUMIDITY
HIGH >”4”<
ENTER ENTER
ENTER
ENTER
ENTER
TIME
”60” MIN
ENTER
ENTER
ENTER
HUMIDITY
1
2
3
1. HUMIDITY LOW "1" Option for selecting lower fan speed in case of low air humidity.
The value can be set to: OFF and 1, 2, 3.
2. LOW "30"% Range adjustable between 15-45%. 30% is standard
3. HUMIDITY HIGH "4" Option for selecting higher fan speed in case of high air humidity.
The value can be set to: OFF and 2, 3, 4.
4. TIME "60" MIN Maximum duration of high fan speed due to high air humidity.
The time can be set from 1-180 min.
The HUMIDITY menu has a option for running at higher and/or lower fan speeds in case of high/low air
humidity.
Low fan speeds are only activated in winter operation and at air humidity levels below 30%.
High speeds are activated by a change from 10% to 5% compared to an average relative air humidity of
40% to 80% over the last 24 hours.
When the current air humidity decreases to the average relative air humidity + 3%, high speed
operation will end. If the time expires before the air humidity has reached this level, high speed
operation will end.
High fan speed is deactivated again when the air humidity falls to within 3% or less of the 24 hour
average.
When the time has expired, a new, elevated daily average is added, so the function is not immediately
re-activated.
Up to 3 minutes may elapse before the high/low fan speed has stabilised.
Flashing menu items are designated with " " .
20