FläktGroup ACJB Guide

INSTALLATION, OPERATION, MAINTENANCE AND SPARE PARTS
AIR HEATING UNIT
HEATMASTER ACJB

Air Heating unit ACJB - Technical manual
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FläktGroup DC_9170GB_20190117_R2 We reserve the right to make changes without prior notice
OPERATION AND MAINTENANCE (FOR USER)
System, functions, main components ...................................................................3
Control panel, operation............................................................................................... 4
Maintenance, filter replacement...............................................................................5
INSTALLATION (FOR INSTALLER AND SERVICE PERSONNEL)
Dismantling and installation of unit .......................................................................6
Capacity data ...................................................................................................................6
Dimensions and weight............................................................................................... 7
Connection diagrams
Unit with electric heater......................................................................................8
Unit with water heater .........................................................................................9
Functions .........................................................................................................................10
Replacement of room temperature sensor (if applicable) ...........................11
ADJUSTMENT, COMMISSIONING (FOR INSTALLER AND SERVICE PERSONNEL)
Settings, Symbol descriptions ................................................................................ 12
Parameter lists ..............................................................................................................13
MISCELLANEOUS
Spare parts ..................................................................................................................... 14
EC Declaration of Conformity................................................................................... 15
CONTENTS
NOTE! INSTALLATION, ADJUSTMENT AND COMMISSIONING AS DESCRIBED
IN THESE INSTRUCTIONS MUST BE CARRIED OUT BY AN INSTALLER OR SERVICE PERSONNEL.
WARNING! THE APPLIANCE MAY BE USED BY CHILDREN OVER THE AGE OF 8, PERSONS (INCLUDING CHILDREN) WITH PHYSICAL,
SENSORY OR MENTAL DISABILITIES OR LACK OF KNOWLEDGE OR EXPERIENCE, PROVIDED THEY HAVE RECEIVED INSTRUCTION
OR INFORMATION ON SAFE USE OF THE APPLIANCE AND UNDERSTAND THE POTENTIAL RISKS. CHILDREN MAY NOT PLAY WITH
THE APPLIANCE. CHILDREN MAY NOT CLEAN OR PERFORM MAINTENANCE ON THE APPLIANCE WITHOUT SUPERVISION.
INFORMATION IN ACCORDANCE WITH ECODESIGN AND
REGULATION EU 2016/2281.
The ACJB is not B
1
, C
2
or C
4
air heating unit.
Type of fuel: Electricity.
Parameter Designation Value Unit
Capacity
Nominal heating capacity
Prated, h 6.0 kW
Minimum Capacity
Pmin 0.0 kW
Other
parameters
Cover losses Fenv 1.9 %
Emission efficiency
hs, flow 96.6 %
Seasonal efficiency for
room heating
hs, h 37.9 %

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SYSTEM, FUNCTIONS, MAIN COMPONENTS
OVERVIEW OF THE AIR HEATING SYSTEM
Air heating unit ACJB
Heat recovery unit
Outdoor air
Extract air
Secondary air
Exhaust air
Toilet
Bathroom
Scullery
Laundry room
Kitchen (cooker hood)
Hallway
or similar
central area
Warm supply air
Other rooms
to be heated
Control panel
Heater
(water/electric)
Filter
Filter Filter
Fan
Fan
Heat exchanger
Supply air
SYSTEM DESIGN
An air heating system combines air-based heating and balanced venti-
lation with heat recovery.
The heat recovery units can be installed in a kitchen, store room, scul-
lery or attic.
An air heating system uses the same ducts for ventilation and heating.
CONTROL
The control unit automatically controls the ACJB unit’s fan and
water or electric heater to maintain the desired temperature.
THE UNIT’S MAIN COMPONENTS
1. Coarse filter (G3) ISO Coarse
2. Fine filter (M5) ISO Coarse 85%
3. Secondary air fan
4. Control unit
5. Postheater (water/electrical)
6.Casing
SUMMER MODE
During the summer months when there is no need for heating, sum-
mer mode can be activated. This reduces the fan operation to 30% af-
ter a set time delay (normally 24 hours). Summer mode is indicated by
a LED on the control panel.
Summer mode is automatically deactivated when there is a need for
heating.
SETTINGS
The temperature, fan speed and other parameters are set in consulta-
tion with the installer/service personnel.
!
1 2 4 5 63
ELECTRICAL DATA
UNIT WITH ELECTRIC HEATING
Voltage: 400 V, 3-phase, 50 Hz
The electric heater operates in two stages: one stage with an output of
3 kW which is controlled steplessly via a pulser, and one fixed stage
with an output of 3 kW which is controlled via a contactor.
Fan motor Output, W Electric heater Output, W Rated output, W
175 2 x 3,000 6,180
UNIT WITH WATER HEATING
Voltage: 230 V, 1-phase, 50 Hz
Fan motor output, W Rated output, W
175 180

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CONTROL PANEL RDKZ-41-1
The operating mode is selected via the external control panel RDKZ-41-
1, which should be installed in a suitable place, either on a wall or in a
wall box. Press the arrow button to select operating mode. The activat-
ed mode is indicated by a LED.
CONTROL PANEL RDKZ-41-1, OPERATION
Figure 2. Operating modes on control panel (RDKZ-41-1).
NORMALSUMMER MODE
FILTER ALARM
FORCEDArrow button
(for selecting operating mode)
Figure 1. Control panel RDKZ-41-1 with mains lead.
NORMAL MODE
The air heating unit automatically controls the fan speed to maintain
the desired temperature.
FORCED MODE
The fan goes up to maximum flow. This function can be used to dis-
tribute surplus heat through the house, for instance if a heating stove
is used.
The unit operates in forced mode for 120 minutes, and then returns to
NORMAL mode. If forced ventilation is required for only a short time, it
can be terminated manually by pressing the arrow button and select-
ing NORMAL mode.
Figure 3. Setting of desired temperature.
SET DESIRED TEMPERATURE
The temperature is set via control panel RDKZ-41-1.
1. Check the current set temperature by pressing either the * or
# button once.
Then count how many times the NORMAL and FORCED symbols
flash.
Note that the NORMAL symbol indicates tens and the FORCED symbol
indicates ones.
Example: If the NORMAL symbol flashes twice and the FORCED symbol
flashes three times, the temperature is currently set at 23º C.
2. To change the temperature, press * to reduce it or # to increase it.
3. After setting the desired temperature, press ARROW to save and
return to normal mode on the control panel.
SUMMER MODE
Each press reduces
the set temperature
by 1 °C
Each press raises
the set temperature
by 1 °C
Indicates ones
(1–9)
Indicates tens
(10–90)
NORMAL FORCED
Saves the set
temperature

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MAINTENANCE, FILTER REPLACEMENT
Figure 5. Location of filters in unit.
MAINTENANCE
Wipe the unit’s casing clean with a cloth. Do not use solvents.
The filter should normally be replaced every 6 months, but sometimes
more frequent replacement is needed.
A timer is set at six months, and the alarm light on the control panel
flashes when it is time to replace the filter.
To replace the filter, follow the steps below.
1. Switch off the unit with the power switch.
2. Open the filter hatch by turning the knobs.
3. Pull out the filters, see figure 5.
4. Insert new filters.
5. Close the filter hatch.
6. Start the unit.
7. Reset the filter alarm by pressing (*) for at least 10 seconds,
see figure 4.
Figure 4.
Resetting of filter
alarm
Alarm light
!
Fine filter
Power switch
Coarse filter
REPLACEMENT OF FILTERS

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DISMANTLING AND INSTALLATION, CAPACITY
THE POWER SUPPLY MUST BE SWITCHED
OFF WHILE CONTROL PANEL RDKZ-41-1 IS
BEING INSTALLED/DISMANTLED.
!
DISMANTLING AND INSTALLATION
Note that the ACJB air heating unit has duct spacers, mounting screw
holes, electrical connections and, if applicable, a pipe connection for
water heating that is the same as on the previous ACJ unit.
1. Disconnect the unit from the power supply by pulling out the plug
or deactivating (removing) the fuse for the unit.
2. Disconnect the unit’s duct connections and, if applicable, the pipe
connections.
3. Disconnect the unit from the existing mounting studs, mounting
brackets and/or silencer box.
4. If there is a room sensor, also disconnect the cables from the room
sensor by opening the smaller front hatch and disconnecting them
from the circuit board.
5. Dismantle the ACJ unit.
6. If necessary, clean the secondary air and supply air ducts.
7. Mount the new ACJB unit using the existing mounting devices.
8. Connect the ducts and any pipes.
9. Replace the existing room sensor (if applicable) with the room sen-
sor supplied with the new unit.
See page 9 for instructions.
10. Install control panel RDKZ-41-1 in a suitable place and connect it to
the unit.
11. Switch on the power to the unit.
10 30 20 40 50 70 90 60 80 100 140 160 120
10
100
200
300
400
500
100 200 300 400 500
∆ps, Pa
q, l/s
q, m3/h
LwA, dB
80%
60%
40%
68
100%
66
64
62
60
58
56
54
52
50
50%
70%
SECONDARY AIR FAN, AIRFLOW AND PRESSURE DROP
HEAT OUTPUT FOR UNIT WITH WATER HEATING
0,06 0,08 0,12 0,10 0,14 0,16 0,18 0,20 0,22
3800
4000
4200
4400
4600
4800
P, W
q
w
, l/s
To prevent the air flowing in the wrong direction during defrosting, it
is recommended to connect a non-return damper between the heat
recovery unit and the air heating unit.
Figure 7.
Figure 6.

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DIMENSIONS AND WEIGHT
DIMENSIONS AND WEIGHT
Weight: 55 kg
125
80
Ø120Ø100
140 200
168
Ø120
=
=
1150
290
580
340
Ø160
Ø100
=
=
Figure 8.

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CONNECTION DIAGRAMS
Figure 9.
UNIT WITH ELECTRIC HEATER
El. heater
3-ph. 3 kW
El. heater
2-ph. 3 kW
Contactor
El. heater
Contactor
Pulser Pulser
Control panel
Supply air
Return
GT
GT
Fan
NL1
1 3 5 A2 1 3 A2
2 4 6 A1 2 4 A1 1 2 3 4 6 5 M A 2 14 3
6
N
L1
0 V
+10 V
5
L2 L3
OK 1
33 32
21
22
23
9
10
11
12
5
6
7
8
1
2
3
4
18
16 17
19
20
27
24
25
26
28
29
31 30

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UNIT WITH WATER HEATING
CONNECTION DIAGRAMS, CONT’D.
Control panel
Return
air
Supply
air
GT
OK 1
TR 1
GT
Fan
Power supply
Valve
Blue
Red
Brown
Figure 10.

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Figure 11. Indication of SUMMER MODE.
FUNCTIONS, CONTROL
ELECTRIC HEATER 3 + 3 kW
When the heating requirement increases, the output signal to the puls-
er increases within a range of 0-100%. When the output signal reach-
es 100%, if there is still a need for increased heating, the unit will go
into plateau mode for a set time period (plateau time, default = 30 min-
utes). When the plateau time ends, the fan speed will increase step-
lessly from MIN to 60% and a new plateau time will start. When the
plateau time ends, if there is still need for additional heating, the fixed
heating stage of 3 kW will be activated via a contactor and the pulser
will regulate the output down to 0%. After this, the pulser increases the
output steplessly from 0 till 100% while the fan speed rises from 60%
up to MAX. The heat and the fan speed are controlled in parallel.
If there is a reduced heating requirement, the pulser will reduce the
output from 100 to 0% while the fan speed drops from MAX to 60%.
When the pulser reaches 0%, the system will wait for 60 seconds. Af-
ter the 60 seconds, if there is still a reduced heating requirement, the
fixed heating stage will be deactivated and the pulser regulates the
output down from 100% to 0%. When the output drops below 75%, the
fan speed will drop steplessly from 60% to MIN.
HIGH SUPPLY AIR TEMPERATURE
If the supply air temperature rises above 55 °C, the pulser will immedi-
ately be deactivated. When the supply air temperature drops below 55
°C, the pulser is immediately reactivated.
If the supply air temperature rises above 65 °C, the fixed heating stage
will immediately be deactivated. When the supply air temperature drops
below 65 °C, the fixed heating stage is reactivated after 60 seconds.
QUICK HEATING FUNCTION
If the temperature setpoint is set to MAX (30 °C), the fan speed and
the temperature will immediately increase to 100%. This quick heating
function is manual and has no automatic stop time or temperature
limitation.
When the desired temperature is reached, the setpoint should be reset
manually (approx. 20 °C).
SUMMER MODE
The SUMMER parameter (default = 0, off) is used to set the amount of
time that elapses before Summer mode is activated when no heating
is needed. The time delay is set in whole hours.
The recommended value is 24 hours.
When the set time (24 hours without a heating requirement) expires,
the fan speed drops to 30% (fixed fan speed). Summer mode is indi-
cated by a LED on the control panel (see figure 11). When the regula-
tor signals a demand for heating (over 5%), Summer mode is deacti-
vated and the fan resumes Normal mode.
OVERHEATING
The automatic overheating protection is activated when the heater
reaches a temperature of 90 °C and is deactivated at approx. 50 °C.
The automatic overheating protection only cuts the heat supply. The fan
will continue operating.
The manually resettable overheating protection is activated when the
heater reaches a temperature of approx. 120 °C and can be reset at
approx. 75 °C. The manually resettable overheating protection cuts
both the heat supply and the fan function.
No indication is shown on the control panel if the overheating protec-
tion has tripped.
WATER HEATER
When the heating requirement increases, the output signal to the pilot
valve increases. When the output signal reaches 50%, if there is still a
need for increased heating, the unit will go into plateau mode for a set
time period (PLATEAU TIME, default =30 min.). When the plateau time
ends, the fan speed will increase steplessly from MIN to MAX and the
heating signal will simultaneously increase from 50% to MAX. The heat
and the fan speed are controlled in parallel.
If there is a reduced heating requirement, the control valve will regulate
the output from 100 to 50% while the fan speed drops from MAX to
MIN. After this, the output signal to the control valve will continue de-
creasing from 50% down to 0%.
SETPOINT
The setpoint can be set via the panel between +10 and +30 °C. The set-
point is always saved automatically in EEPROM, regardless of whether
it is changed via the parameter list or via quick setting.
An external potentiometer (optional accessory) can be connected to
the vacant temperature contact next to the two temperature sensors.
The board automatically detects the connected potentiometer and
reads the setpoint from it. The current setpoint can be read from the
panel, but it cannot be changed from the panel.
The potentiometer can be removed at any time, even while the pow-
er is switched on. If it is removed, the function will return to the panel
(plug and play).
FILTER ALARM
The dirty filter alarm counts 180 days before the red light flashes. To
acknowledge the alarm, depress the left button (star) for 10 seconds.
The filter alarm is activated by default (parameter 7 = 1). The alarm can
be deactivated (parameter 7 = 2).
TEMPERATURE SENSOR MALFUNCTION
If a temperature sensor becomes faulty, the heat supply will be
blocked completely but the fan will continue operating. A temperature
error will not be indicated.
START-UP
On start-up, the fan will run at maximum speed for 8 seconds and
then run at NORMAL speed.
SUMMER MODE

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Figure 13. Replacement of cable on the control unit’s terminal block.
Figure 12. Junction box for cable from room temperature sensor.
REPLACEMENT OF ROOM TEMPERATURE SENSOR (IF APPLICABLE)
!
1
2
If the old ACJ unit has a room temperature sensor, the sensor cannot
be used in the new ACJB unit. A new room temperature sensor (option-
al accessory) must be installed in the new unit.
1. Disconnect the unit from the power supply.
2. Remove the old room sensor.
3. Connect the room temperature sensor to the existing room temper-
ature cable from the old unit.
4. Connect the room temperature cable to the junction box on the
short side of the unit (see figure 12). First remove the protective
cover. Connect the ends of the cables, then reconnect the protective
cover.
5. On the control unit’s terminal block, replace the cable from the
temperature sensor in the unit’s inlet with the cable coming out
of the junction box on the short side of the unit (the cable from the
new room temperature sensor) with the white marking .
See figure 13.
6. Switch on the power to the unit.

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Table 15.
SETTINGS, SYMBOL DESCRIPTIONS
NOTE! THE MINIMUM FAN SPEED MUST BE INCREASED
DEPENDING ON THE SIZE OF THE HOME.
AMONG OTHER THINGS, THIS PREVENTS THE
OVERHEATING PROTECTION FROM TRIPPING.
SETTINGS
To change a parameter, follow the instructions below.
Also see the parameter list and figure 15.
1. Always start from normal operating mode.
2. Activate reading mode by depressing * and # simultaneously for
about 3 seconds.
The parameter number is illustrated by the number of times the
alarm symbol flashes. See the parameter list provided.
3. Switch between the parameters by pressing * (previous) and #
(next).
4. To change a current parameter’s value, depress * and # simulta-
neously again for roughly 3 seconds until the alarm light is steadily
illuminated.
5. The parameter value can now be adjusted by pressing * (reduce)
and # (increase). The parameter value is illustrated by the number
of times the green LEDs flash (see table 16).
6. Confirm the change by pressing the ARROW button.
7. To change more parameters, repeat the procedure above.
To restore the factory settings, depress * and # simultaneously for
more than 15 seconds.
Symbol Reading mode Adjustment mode
The number of times the alarm symbol
flashes indicates which parameter is
displayed. See the parameter list below.
Steady illumination indicates that adjustment mode is active and that
the current parameter value can be changed
A flashing light indicates hundreds
A flashing light indicates tens A flashing light indicates tens
A flashing light indicates ones A flashing light indicates ones
SYMBOL DESCRIPTION FOR CONTROL PANEL RDKZ-41-1 WHEN MAKING ADJUSTMENTS
Figure 14 Symbols on display
Arrow button
(CONFIRM/SAVE)
Lowers the set value in
programming mode
Raises the set value in pro-
gramming mode
When all the LEDs flash simultaneously, confirm the reset by pressing
the arrow button.
Note: If you do not press the arrow button, only the setpoint will be re-
set to 20 °C.

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ELECTRIC HEATER 3 + 3 kW
Parameter Function Setting Factory setting
1 Setpoint value supply air °C 10–30 20
2 Current temperature supply air °C Display
3 Current temperature secondary air °C Display
4 Summer mode 0=no 1-255=number of hrs before acti-
vation 0–255 0
5 Adjustment MIN speed in % 40–60 40
6 Adjustment MAX speed in % 40–100 100
7 Filter alarm 1=Yes 2=No 1–2 1
8 Plateau time in minutes before changing the fan speed
and heat output 0–255 30
9 Internal function – –
10 P-band multiplier 1–255 8
11 Int action time 1=5min 1–255 10
12 Current register value Display
13 Current bit information Display
WATER HEATER
Parameter Function Setting Factory setting
1 Setpoint value supply air °C 10–30 20
2 Filter alarm 1=Yes 2=No 1–2 1
3 Adjustment MIN speed in % 40–100 40
4 Adjustment MAX speed in % 40–100 100
5 Current temperature supply air °C Display
6 Current temperature extract air °C Display
7 P-band multiplier 1–255 8
8 Int .action time 1=5 min. 1–255 10
9 P-band VA multiplier (not used) 1–255 8
10 Int. action time VA 1=5 min. (not used) 1–255 10
11 Range 0–200 100
12 Plateau time in minutes before changing the fan speed
and heat output
0–255 30
13 Summer mode (not used) 0–255
14 Control type electric/water (not used)
PARAMETER LISTS

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REPLACEMENT PARTS
If the supply cord is damaged, it must be replaced by the manufacturer, an authorised service firm or a similarly qualified professional
in order to avoid hazard.
Pos. Designation Name Included in Quantity
1 ACJZ-01 Coarse filter ACJB, (G3) ISO Coarse ACJB 5
1 ACJZ-02 Fine filter ACJB, (M5) ISO Coarse 85% ACJB 2
1 ACJZ-03 Filter kit ACJB, (G3) ISO Coarse + ((M5) ISO Coarse 85%)
ISO Coarse 85%
ACJB 1
2 ACJB-99-21 Fan, complete EC 175 W ACJB 1
3 ACJB-99-15 Control board, electric heater 3 + 3 kW ACJB-aa-b-c-1-e 1
3 ACJB-99-16 Control board, electric heater 6 kW ACJB-aa-b-c-1-e 1
3 ACJB-99-17 Control board, water heater ACJB-aa-b-c-5-e 1
4 ACJB-99-08 Temperature sensor kit, 1+1 ACJB 1
5 CPDC-99-01 Switch ACJB 5
6 ACJB-99-11 Electric heater 3 + 3 kW ACJB-aa-b-c-1-e 1
6 ACJB-99-12 Electric heater 6 kW*) (conversion kit 3 + 3 kW) ACJB-aa-b-c-1-e 1
6 ACJB-99-02 Water heater ACJB-aa-b-c-5-e 1
7 ACJB-99-05 Pulser ACJB-aa-b-c-1-e 1
8 ACJB-99-06 Contactor ACJB-aa-b-c-1-e 1
9 ACJB-99-03 Valve actuator ACJB-aa-b-c-5-e 1
10 ACJB-99-07 Transformer 230/24V ACJB-aa-b-c-5-e 1
*) Electric heater 6 kW has been discontinued. It has been replaced with electric heater 3 + 3 kW including conversion kit.
!
21 6
7
3
44 8
5

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WWW.FLAKTGROUP.COM HEATMASTER ACJB
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