Kaysun KRE-500DX1 Operating instructions

KRE-500DX1 KRE-1000DX1
INSTALLATION, USER &
MAINTENANCE MANUAL
Cross-flow heat recovery

NOTES: The company reserves the right to modify data, pictures and all that is related to this printed matter without any notice.
pag. 2
INDEX
DECLARATION OF CONFORMITY................................................................................................................................................... page 3
GENERAL WARNINGS...................................................................................................................................................................... page 4
SYMBOLED USED ............................................................................................................................................................................. page 5
IDENTIFICATION UNIT ...................................................................................................................................................................... page 5
SECTION 1 - GENERAL CHARACTERISTICS................................................................................................................................. page 6
1.1 Presentation of the manual......................................................................................................................................................... page 6
1.2 General characteristics............................................................................................................................................................... page 6
1.3 KRE DX series technical data .................................................................................................................................................... page 6
1.4 Dimensions and weights KRE DX .............................................................................................................................................. page 7
1.5 Characteristic curves .................................................................................................................................................................. page 8
1.6 Sound power levels .................................................................................................................................................................... page 9
SECTION 2 - TRANSPORT ............................................................................................................................................................... page 9
2.1 Packing....................................................................................................................................................................................... page 9
2.2 Handling and transport ............................................................................................................................................................... page 9
2.3 Control upon reception ............................................................................................................................................................... page 9
2.4 Storage ....................................................................................................................................................................................... page 9
SEZIONE 3 - INSTALLATION AND START UP................................................................................................................................page 10
3.1 Definitions................................................................................................................................................................................... page 10
3.2 Safety Standards ........................................................................................................................................................................ page 10
3.3 Preliminary operations ............................................................................................................................................................... page 10
3.4 Choice of the installation place................................................................................................................................................... page 10
3.5 Positioning of the unit ................................................................................................................................................................. page 12
3.6 Drain tray connection.................................................................................................................................................................. page 12
3.7 Connection to the ducts.............................................................................................................................................................. page 12
3.8 Connecting the refrigerant pipes ................................................................................................................................................ page 13
3.9 Connecting PRE-DX................................................................................................................................................................... page 14
SECTION 4 - ELECTRICAL CONNECTIONS.................................................................................................................................... page 15
4.1 Electric board’s layout - DX Module .......................................................................................................................................... page 15
4.2 Wiring plan.................................................................................................................................................................................. page 16
4.3 Temperature sensor Installation ................................................................................................................................................. page 17
4.3 Wiring connection ....................................................................................................................................................................... page 18
4.4.1 Access to electrical panel........................................................................................................................................................... page 18
4.4.2 Insertion of the electrical supply line and signals for accessories ............................................................................................. page 18
SECTION 5 - SETTINGS MODULE ................................................................................................................................................... page 19
5.1 Application control ...................................................................................................................................................................... page 19
5.2 System address and network address setting............................................................................................................................ page 19
5.3 Checks before start up ............................................................................................................................................................... page 19
5.4 Module setting indications .......................................................................................................................................................... page 20
5.5 Error codes and Query .............................................................................................................................................................. page 23
SECTION 6 - PANEL SETTINGS AND ADJUSTMENTS.................................................................................................................. page 25
SECTION 7 - ORDINARY MAINTENANCE ....................................................................................................................................... page 28
7.1 Warning....................................................................................................................................................................................... page 28
7.2 Monthly checks........................................................................................................................................................................... page 28
7.3 Yearly checks ............................................................................................................................................................................. page 29
7.3.1 Biox-dx purifying system check .................................................................................................................................................. page 29
SECTION 8 - BREAKDOWN DIAGNOSTIC ...................................................................................................................................... page 30
SECTION 9 - DISPOSAL.................................................................................................................................................................... page 30
SECTION 10 - SPARE PARTS........................................................................................................................................................... page 31

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EDUARDO
ROMANO
BUSINESS UNIT MANAGER HVAC &ENERGY
FRIGICOLL, S.A. BLASCO DE GARAY, 4-6 , 08960 SANT JUST DESVERN , SPAGNA
SANT JUST DESVERN,06/11/2020

pag. 3

This manual is an integral part of the apparatus and then it must be preserved with care and it ALWAYS must accompany the machine, even in the
case of cession to another owner or user or in the case of a transfer on another system. In the case of its damage or losing, ask another copy to
the distributor Company.
The repairs or the maintenance must be carried out by expert and qualified staff as it is expected in this handbook. Don’t modify or tamper with the
machine because it can create dangerous situations and the distributor Company does not answer to possible damages.
Check the perfect integrity of all machine components. Check that in the packing all the accessories for the installation and the relevant documen-
tation, are included. In the case of not conformity turn to seller company.
The installation of the machine must be carried out by qualified Company according to the law March, 5th 1990 n° 46 which, at the end of the work,
must give to the owner, the declaration of conformity of installation workmanlike, that is in compliance with the regulations in force and with the indi-
cations of this handbook.
The distributor Company does not answer to possible damages to people, animals or things, due to wrong installation, regulations and maintenance
or due to illegitimate use.
Remember that in the use of products that use electrical energy and water, some fundamental rules of security must be observed.
In particular:
Children and handicapped people without assistance must not use the machine.
Don’t touch the machine if you are barefoot and if you are wet.
Do not proceed with cleaning or maintenance operations, before switching off the electric power supply.
Do not modify security or adjustement devices without permission and indications of the Manufacturer Company.
Do not pull, remove, twist electrical cables coming out from machine, even if these is disconnected from power supply network.
Do not walk up, sit down and/or place any objects on the machine.
Do not spurt water directly on the machine.
Do not open access doors of the machine, without positioning general switch of the system on "off" .
Do not scatter, leave close by children packing material because it could be dangerous.
GENERAL WARNINGS
pag. 4

IMPORTANT NOTES
THE HEAT RECOVERY UNITS OF KRE DX SERIES ARE ONLY SUITABLE FOR INTERNAL INSTALLATION
The heat recovery unit is a machine designed and built exclusively to change air in the civil environments, incompatible with toxic and
inflammable gases. Therefore it cannot be used in those environments where the air is mixed and/or altered by other gaseous com-
posites and/or solid particles.
The use of the same for different purposes from those envisioned, not conform to that described in this manual, will make any direct
and/or indirect liability of the Manufacturer automatically become null and void.
IDENTIFICATION OF THE UNIT
SYMBOLS USED
WARNING
DANGER
DANGER OF ELECTRICAL SHOCK
QUALIFIED STAFF ONLY
PROHIBITION
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B
A
C
D
E
F
G
H
L
M
I
AManufacturer's mark
BManufacturer's address
CModel
DSerial number
EVoltage; number of phases; frequency
FMaximum absorbed current [A]
GCode
HManufacturing date
IIP Grade
LCE mark
MBarcode
pag. 5

SECTION 1 - GENERAL CHARACTERISTICS
1.1 Presentation of the manual
This manual describes the rules for the transportation, the installation, the use and the maintenance of the heat recovery. The user will find every-
thing that is normally useful to know for a correct and safe installation of the KRE DX unit.
The non-observance of what is described in this handbook and an inadequate installation of the KRE DX unit may cause the cancellation of the
guarantee that the Manufacturer/Distributor Company grants on the same one. The Manufacturer/distributor Company, moreover, does not
answer to possible direct and/or indirect damages due to wrong installation carried out by inexpert and/or non-authorised staff. At the moment of
the purchase, check that the machine is integral and complete. Claims will have to be produced within 8 days from the reception of the goods.
1.2 General characteristics
• Galvanized steel self-supporting panels, internally and externally insulated
• Counterflow air-to-air heat recovery device, made of plane sheets of special paper with special sealing to keep airflows separate and only
permeable to water vapor. Total heat exchange with temperature efficiency up to 76% and enthalpy efficiency up to 67%, also at high
level during summer season
• ISO 16890 Coarse 50% + ePM2.5 95% (F9 EN779) efficiency class filters on fresh air, Coarse 50% (G3 EN779) filer on return air intake. All
filters are made with synthetic cleanable media.
• Removable side panel to access filters and heat recovery in the event of scheduled maintenance
• Motorised heat recovery by-pass device automatically controlled by unit control to use fresh air free-cooling when convenient
•Low consumption, high efficiency & low noise direct driven fans with EC motors
•Supply section complete with DX coil (R410A) fitted with solenoid control valve, freon filter, contact temperature sensors on liquid and gas
line, NTC sensors upstream and downstream airflow
•Integrated sanitization system BIOX-DX®, switched on at fans running, able to do an efficient antibacterial treatment, ensuring a perfect heal-
thiness of supplied air
• Built-in electric box equipped with PCB to control internal fan speed and to interconnect outdoor/indoor units
• Duct connection by circular plastic collars
• PRE-DX-500 electric pre-heating module (available as an accessory) for temperatures below -5 °C.
1.3 KRE DX series technical data
MODEL KRE- 500DX1 1000DX1
Nominal air flow m3/h 500 1000
Nominal external static pressure Pa 90 115
Electrical power supply V/ph/Hz 220 - 240 / 1 / 50
Total full load amperage A0.6 2.1
WORKING LIMITS
Limit working temperature °C / % - 15 …+ 40°C / 10 … 95 %
FANS
Motor typology EC EC
Number of speeds 33
Fan control (1) Man Man
Internal specific fan power of ventilation components - SFP int (5) W/(m3/s) 547 881
Total nominal power input kW 0.15 0.39
Sound pressure level (2) dB(A) 39 43
HEAT EXCHANGER
Winter thermal effic. (3) %76.0% 76.0%
Winter enthalpy effic. (3)%67.0% 62.0%
Summer thermal effic. (4) %76.0% 76.0%
Summer enthalpy effic. (4) %63.0% 60.0%
Dry thermal efficiency (5) %76.0% 76.0%
DX COIL
Heating capacity (6) kW 2,5 (2,7) 5,2 (6,7)
Approximate supply air temperature at (6) condition °C 28,0 (27,3) 28,5 (27,8)
Approximate supply air humidity at (6) condition %16 (15) 15 (14)
Total cooling capacity (7) kW 3.0 5.8
Sensible cooling capacity kW 2.1 4.1
Approximate supply air temperature at (7) condition °C 15.9 16.2
Approximate supply air humidity at (7) condition %90 89
pag. 6
KRE- 500DX1 1000DX1

ACCESSORIES
• Electric pre-heater module - PRE-DX
Finned pipe coil with safety thermostats enclosed between galvanized steel plates with duct round adapters downstream and upstream, to be pla-
ced externally, connected to the suction of fresh air stream.
1.4 Dimensions and weights KRE DX
(1) Man = Manual by selector switch or control panel;
(2) Sound pressure level calculated at 1 m far from service side of casing, with ducted supply, exhaust, return and fresh air, at nominal condi-
tions return-fresh air intake/service side, at nominal conditions.
(3) Outside air at -5° 80% RH; room air at 20°C 50% RH
(4) Outside air at 32° 50% RH; room air at 26°C 50% RH
(5) Refeer to EU 1253/2014 regulation: at nominal pressure; air conditions refer to EN 308 standard
(6) Air inlet condition: 13°C DB, RH 40% (11°C DB, RH 45%); condensing temp. 40°C
(7) Air inlet condition: 28,5°C DB, RH 50%; evaporating temp. 7°C
pag. 7
Model
Dimension [mm]
Weight net / gross
[Kg]
Packing
dimensions
[mm]
Packaging
overlap
A B C D E E1 FF1 G L T K M N P R S Y Z
KRE-500DX1 904 1450 107 200 825 1445 960 830 19 955 500 135 270 350 135 135 202 350 135 90 - 98 1750x1120x420 6
KRE-1000DX1 1216 1750 85 250 1130 1750 1273 1140 19 1290 621 171 388 550 146 241 151 415 195 105 - 120 2080x1460x540 5

1.5 Characteristic curves
0
50
100
150
200
250
300
0 100 200 300



External static pressure [Pa]
400 500 600
Air flow [m3/h]
0
100
200
300
400
500
0 200 400 600 800 1000 1200 1400



External static pressure [Pa]
Air flow [m3/h]
KRE-500DX1
KRE-1000DX1
pag. 8

KRE-500DX1 Sound power levels Lw at center band frequencies Total Lw
Hz 63 125 250 500 1000 2000 4000 8000
Supply duct dB(A) 32.8 37.9 54.9 55.5 54.2 52.2 44.0 33.9 60.5
Exhaust duct dB(A) 32.8 46.9 54.2 55.6 55.0 52.2 44.0 33.9 60.7
Outside the casing dB(A) 27.8 33.1 42.8 41.3 40.0 37.4 12.7 9.0 47.0
1.6 Sound power levels
Noise at nominal working point
KRE-1000DX1 Sound power levels Lw at center band frequencies Total Lw
Hz 63 125 250 500 1000 2000 4000 8000
Supply duct dB(A) 46.4 52.9 60.1 59.3 59.0 59.0 52.5 47.9 66.0
Exhaust duct dB(A) 45.8 52.5 57.0 58.1 56.6 57.2 52.0 47.9 64.1
Outside the casing dB(A) 41.1 41.4 44.8 44.3 43.0 43.2 20.3 17.9 51.0
Noise at nominal working point
SECTION 2 - TRANSPORT
2.1 Packing
• The regenerators and their accessories are inserted in cardboard boxes that will have to remain integral until the moment of the assembly.
• The components that, due to technical requirements, are not assembled, are supplied packed in a suitable covering and fixed to the inside or
outside of the unit.
2.2 Handling and transport
• For the handling, in function of the weight, use adequate means in conformity to the directive 89/391/EEC and successive modifications.
• The weight of every single machine is shown on the attached technical data sheet.
• Avoid rotations without control.
• Take utmost care during loading operations: all the machines must be loaded and stored in the truck interposing opportune spacers to safe-
guard all protruding parts like water couplings, handles, hinges.
2.3 Control upon reception
Upon reception of the goods, please carry out a control of all the parts, verifying that the transport has not caused damages. All damages must
be communicated to the carrier, putting a reserve clause on the delivery note and specifying the type of damage.
2.4 Storage
In case of long term storage, keep the machines protected from dust and from all sources of vibrations and heat.
The manufacturer company declines every responsability for damages due to uncorrect unloading or not sufficient protection
against atmospheric agents.
pag. 9

SEZIONE 3 - INSTALLATION AND START UP
3.1 Definitions
CUSTOMER - The customer is the person, the agency or the company, that has acquired or rented the unit and that uses it for the conceived
purpose.
USER / OPERATOR - The operator or user is the physical person who has been authorised from the customer to operate with the machine
SPECIALISTIC STAFF - Intended are all those physical persons who have achieved a specific training, are therefore in a position to recognize
the dangers deriving from the use of this machine and are able to avoid them.
3.2 Safety Standards
The Manufacturer/Distributor Company declines whichever responsability for the non observance of the emergency and prevention norms
described below.
It declines furthermore responsibility for damages caused by an improper use of the unit and/or by modifications carried out without authoriza-
tion.
• The installation must be carried out by expert and qualified staff.
• During installation operations, use suitable accident-prevention clothing, as an example: glasses, gloves, etc as indicated by the 686/89/EEC
and successive norms.
• During installation, operate in absolute safety, in clean surrounding and free from impediments.
• Respect the laws in force in the Country in which the unit is installed, concerning the use and the disposal of the packings and the products
used for cleaning and maintainig the machine and follow the manufacturer instructions of such products.
• Before putting the unit in function, check the perfect integrity and safety of all components and of the entire system.
• Avoid at all cost to touch the parts in motion or to intefere with the same ones.
• Do not proceed with cleaning or maintenance operations, before switching off the electric power supply.
• The maintenance and the substitution of damaged or worn out parts of the unit must be carried out by qualified staff only and following the
indications contained in this handbook.
• Spare parts must correspond to the requirements defined by the Manufacturer Company.
• In case of dismantling of the unit, follow the relevant antipollution norms.
N.B. When using the unit, the installer and the user must take into account and place remedy to all the other types of risk connected with the
sistem. As an axample risks deriving from entry of foreign bodies, or risks deriving from the conveying of dangerous gases that are inflamma-
ble or toxic at high temperature.
3.3 Preliminary operations .
• Check the perfect integrity of all components.
• Check that in the packing all the accessories for the installation and the relevant documentation, are included.
• Transport the packed section as close as possible to the installation place.
• Do not put tools or weights over the packed unit.
3.4 Choice of the installation place
• Place the unit on a solid structure that shall not causes vibrations and that is solid enough to support the weight of the machine.
• Do not place the unit in rooms where inflammable gases, acids or aggressive and corrosive substances may be present. These could dama-
ge the different components in an irreparable way.
• Foresee a minimum free space as shown on the following figures, to make possible the carrying of scheduled and not scheduled maintenan-
ce; in order to do maintenance to BIOX-DX system, allow accessibility from lower side around supply section with DX coil.
pag. 10

450 mm MINIMUM FREE SPACE
FOR CHECKING AND
MAINTENANCE
CEILING
FALSE-CEILING
pag. 11
Modello KRE DX KRE-500DX1 KRE-1000DX1
A (mm) 450 450

3.5 Positioning of the unit
In the continuation are illustrated some sequences of the
assembly:
1. Carry out the drilling on the ceiling and fix six M8
threaded rods as shown in the figure.
2. Position the unit on the six threaded rods (eight brac-
kets available).
3. Block the unit by locking the bolts.
3.7 Connection to the ducts
• The ducts must be dimensioned in function of the system and of the air flow characteristics of the unit ventilators. A wrong calculation of the
ducts may cause loss of power or the possible activation of devices fitted on the unit.
• Severe bending, several bending and diameter reductions of the ducts should be avoided to minimize the pressure loss.
• In order to prevent the formation of condense and to reduce the noise level it is advised to use insulated ducts.
• If rigid ducts are used, to avoid the transmission of possible vibrations of the machine in the atmosphere, it is advised to interpose an antivi-
brating joint between the air outlets and yhe ducts. The electrical continuity between duct and machine must however be guaranteed through
a earth cable.
• The distance between indoor inlet port and indoor intake port should be as far as possible
• In order to prevent the penetrations of rains, the ducts connecting the unit with the outside should be protected by grilles.
Moreover the ducts should be a little tilted
IMPORTANT: IT IS PROHIBITED TO START UP THE UNIT, IF THE FANS OUTLETS ARE NOT CANALIZED OR PROTECT WITH AN ACCI-
DENT-PREVENTION NET AS PER UNI 9219 AND SUCCESSIVE NORMS.
Exhaust air
duct
Indoor Intake
duct
Room intake
opening
Supply air duct
Threaded rods (min 6)
Outside
intake air
Outside intake duct
Brackets
Inside supply
opening
3.6 Drain tray connection
Close to supply air duct connection, a drain tray outlet
(1/4” hose pipe) shall be connected for discharge of con-
densed water during cooling mode.
It is strongly suggested to install a water trap close to
the unit in order to avoid odors coming inside and to get
a slope on discharge pipeline.
pag. 12

3.8 Connecting the refrigerant pipes
The unit is supplied with plugged direct expansion coil: to ensure its tightness during storage and transport, inside it is loaded nitrogen gas at
a higher pressure than atmospheric.
1) First loosen the FLARE 1/4 ”union (1) and carry out the leak test, checking that a clear noise is heard due to the outflow of pressurized
nitrogen coming out of the pipe.
2) Loosen the 1/2 "FLARE pipe union (2) and remove the rubber cap
3) Prepare the pipes to be connected following the procedure:
Cut the copper tube to the required length with a tube cutter. It is•
recommended to cut approx. 30 – 50 cm longer than the tubing
length you estimate.
Remove burrs at each end of the cop-•
per tubing with a tube reamer or file.
This process is important and should be
done carefully to make a good flare. Be
sure to keep any contaminants (moistu-
re, dirt, metal filings, etc.) from entering
the tubing.
Remove the flare nut from the unit and be sure to mount it on the copper tube.•
Make a flare at the end of the copper tube with a flare tool. A good flare should•
have the following characteristics:
-inside surface is glossy and smooth
-edge is smooth
-tapered sides are of uniform length
Apply a sealing cap or water-proof tape to prevent dust or water from entering the•
tubes before they are used.
Be sure to apply refrigerant lubricant (ether oil) to the inside of the flare nut before•
making piping connections. This is effective for reducing gas leaks.
For proper connection, align the union tube and flare tube straight with each other,•
then screw on the flare nut lightly at first to obtain a smooth match.
Adjust the shape of the liquid tube using a tube bender at the installation site and•
connect it to the liquid tubing side valve using a flare.
pag. 13
Flare nut
Copper
tubing
Flare tool
Apply refrigerant lubricant.
Union Flare nut
Indoor unit
Spanner
Torque wrench

3.8 Connecting therefrigerant pipes
CAUTIONS DURING BRAZING
Replace air inside the tube with nitrogen gas to prevent copper oxide film from forming during the brazing process. (Oxygen, carbon dioxide
and Freon are not acceptable.)
●Do not allow the tubing to get too hot during brazing.The nitrogen gas inside the tubing may overheat, causing refrigerant system valves to
become damaged. Therefore allow the tubing to cool when brazing.
●Use a reducing valve for the nitrogen cylinder.
●Do not use agents intended to prevent the formation of oxide film. These agents adversely affect the refrigerant and refrigerant oil, and may
cause damage or malfunctions.
TIGHTENING
In the table below are shown the pipes diameter for each unit
For the flare nuts at tubing connections, be sure to use the flare nuts that were supplied with the unit, or else flare nuts for R410A. The refrige-
rant tubing that is used must be of the correct wall thickness as shown in the table below.
Because the pressure is approximately 1.6 times higher than conventional refrigerant pressure, the use of ordinary flare nuts or thin-walled
tubes may result in tube rupture, injury, or asphyxiation caused by refrigerant leakage.
In order to prevent damage to the flare caused by overtightening of the flare nuts, use the table above as a guide when tightening.
When tightening the flare nut on the liquid tube, use an adjustable wrench with a nominal handle length of 200 mm.
INSULATING THE REFRIGERANT TUBING
Thermal insulation must be applied to all units tubing, including distribution joint (field supply). For gas tubing, the insulation material must be
heat resistant to 120°C or above. For other tubing, it must be heat resistant to 80°C or above.
Insulation material thickness must be 10 mm or greater.
If the conditions inside the ceiling exceed DB 30°C and RH 70%, increase the thickness of the gas tubing insulation material by 1 step.
ø Tube Tightening torque Tube thickness
ø 6,35 (1/4”) 14 - 18 N*m 0,8 mm
ø 12,7 (1/2)” 49 - 55 N*m 0,8 mm
Unit KRE-500DX1 KRE-1000DX1
Gas Pipe ø 12,7 mm
Liquid Pipe ø 6,35 mm
3.9 Connecting PRE-DX
• The electric heater shall be connected to the suction of fresh air stream, both upstream and downstream to a duct of the same nominal diam-
eter; the duct must be fully inserted on the heater sleeve up to the stop, so that it fits the airtight gasket.
• It is suggested to mount the heater as close as possible to the unit to which it is connected. For PRE-DX heater the ambient temperature
must be from -25°C to +30°C; degree of protection IP40.
• The heater can be installed both horizontally and vertically; in case of horizontal electric heater, the electric box must be placed according to
one of the positions.
• The heater must be adequately supported, so that unit connections are free from any stress.
• The heater must not be insulated.
For BE heater, the supply air temperature must be lower than 50°C and the air speed must be higher than 2 m/s. Make sure that the
heater is turned ON only when the fan is switched on. The fan must continue to run at least 30 seconds after the heater has been
turned off.
• Connections and cables that are used for them have to be supplied by the installer.
• For power supply of the electric heater use a 3-wire cable (line, neutral, ground), sized for the specific current of the selected model. First,
pass along the free ends of the three cables from the inside of electrical board to the outside, through the glands on the basic unit.
pag. 14
Flare insulator
Insulation tape (white)
Flare union
Unit side
Flare nut
Tube insulator
(not supplied)
Heat resistant
Insulation
Liquid tubing
Two tubes arranged together
Gas tubing
Modello / Model
PRE-DX
Pt pre Ampere Dt nom Stadi / Stages V / ph / Hz Ø A B C Peso / Weight
kW °C n° mm mm mm mm kg
KRE-500DX1 1.5 6.5 9.0 1 230 / 1 / 50 200 400 289 200 4.6
KRE-1000DX1 2.5 10.9 9.0 1 230 / 1 / 50 250 400 342 260 4.8

SECTION 4 - ELECTRICAL CONNECTIONS
• The electrical connections to the control cabinets must be carried out by specialized staff, following the supplied wiring diagrams.
• Make sure that the voltage and the frequency specified on the nameplate correspond to those of the power supply line.
• For the main supply of the regenerator is not allowed to use adapters, multiple sockets and/or cable extensions.
• The installer must foresee the installation of the cut-off switch and of everything that is necessary for the protection of the electri-
cal components, as close as possible to the unit.
• Connect the unit to an effective earth, using the appropriate screw fitted on the unit.
Before beginning whichever operation make sure that the voltage supply is cut off.
Carry out the connection with cables of a section which is adapted to the engaged power and in the respect of the local norms.
Their dimension must however allow to realize a voltage drop of less than 3% during the starting phase.
4.1 Electric board’s layout - DX Module
pag. 15
fig.4.1
MORSETTI DI
ALIMENTAZIONE
POWER CLAMPS
NUCLEO DI FERRITE
FERRITE CORE

4.2 Wiring plan
L = linea /
line
N = neutro /
neutral
PE = terra /
protective earth
LINEA ALIMENTAZIONE: PREDISPORRE A MONTE UNA ADEGUATA PROTEZIONE
CON INTERRUTTORE MAGNETOTERMICO DIFFERENZIALE /
POWER LINE: PROVIDE A
PROPER SAFETY DEVICES EQUIPPED WITH DIFFERENTIAL MAGNETOTHERMAL SWITCH
Vm red
GND black
Vcc white Vsp yellow
FG blue
M1
Vm red
GND black
Vcc white Vsp yellow
FG blue
M2
Running signal
Fault signal
A TRATTEGGIO SONO RAPPRESENTATI I COLLEGAMENTI DA EFFETTUARSI A CURA DELL'INSTALLATORE
DASHED LINES SHOW THE CONNECTIONS TO BE CARRIED OUT BY THE INSTALLER
exhaust
fan
supply
fan
Bypass
Electrical heater
Humidity
sensor
Dial
switch
RA Probe
FR EA
Probe
OA
Probe
SA
Probe
CO2
Probe
LN


Pressostato
differenziale filtri
Differential filter
pressure switch



Max
speed
Low speed
Medium speed
*


 ""$(& #
!""$ &
%'!$#
%)!$#" 
LD4
BIOX-DX (opzionale)
(option)
Bus comunicazione
unità esterne /
Communication bus
to external unit
CN10
CN3 - CN4
CN9 CN23
CN19 CN23
Al comando cablato
(opzionale) / To
wired command
(option)
Al comando cablato
(del costruttore) / To
wired command
(manufacturer)
pag. 16

pag. 17
There are five temperature sensors (T1, TA, T2A, T2, and T2B) and five extension wires in the accessories, as shown in Figure 4.3a.
4.3 Temperature sensor Installation
fig.4.3a
fig.4.3b
Mounting location for temperature sensors:
T1: is an AHU inlet air temperature sensor; it should be installed at the air inlet of the AHU.
T2A: is an AHU evaporator inlet temperature sensor; it should be installed at the inlet pipe of the evaporator.
T2: is an AHU evaporator intermediate temperature sensor; it should be installed at the intermediate pipe of the evaporator.
T2B: is an AHU evaporator outlet sensor; it should be installed at the outlet pipe of the evaporator.
TA: is an outlet air temperature sensor and therefore does not need to be installed if outlet air temperature control is not selected.
Mounting location of T2A, T2, and T2B tube temperature sensors
T1, TA
T2A, T2, T2B
Temperatur sensor
White
Extension wire
White
Black
Blue
Red Red Red
Blue Blue
Black Black
Black Black
White White
Gas pipe
Liquid pipe

pag. 18
4.3 Wiring connection
4.4.1 Access to electrical panel
• Remove the fixing screws of electrical panel (FIG 4.4a)
• Rotate the electrical panel and extract on the left (FIG 4.4b)
4.4.2 Insertion of the electrical supply line and signals for accessories
• Screw down the cable glands placed outside the QE: insert the cable into the cable gland cover, then into the cable gland, towards the inside
of the compartment, taking care to pass it through the already prepared ferrite core. Ref. fig. 4.1 page 45.
fig.4.4a fig.4.4b

pag. 19
5.2 System address and network address setting
1) After first powered on, please set the system address by remote controller or wired
controller, the address range is 0-63, the indoor unit addresses of the same system
can not be repeated.
2) Display as the table.5-2, when there are different ENC1, the address setting will be dif-
ferent;
Each independent control box needs to be set an address, this address is an actual
address; when the capacity code ENC1 is selected to be E-4, this indoor unit inde-
pendent control box will produce virtual address(es) with corresponding quantity based
on the set actual address, and if an address has been an actual address or virtual
address, then this address can not be the actual address or virtual address of other
indoor unit in the same system;
For example, if there are two independent control boxes in the same system, one of
the capacity code is E, the setting actual address is 5, then according to the table.7-2
this control box will produce one virtual address as 6, and then the actual address and
the virtual address of the other independent control box can not be any one of 5, 6;
The actual address and the virtual address should less than or equal to 63.
3) The indoor unit quantity detected by outdoor unit will be the sum of the actual address
quantity and the virtual address quantity, e.g. when the capacity code of independent
control box is E, the setting actual address is 5, then it will produce virtual address 6,
and then the indoor unit quantity detected by outdoor unit will be 2.
4) The outdoor unit can not use auto addressing for to set the address for the indoor unit
without address; only the indoor unit has address then can the outdoor unit to be set
auto addressing;
5) When the independent control box system connects to the indoor unit centralized con-
troller, the actual address and the virtualaddress will be displayed on the centralized
controller, e.g. when the capacity code of independent control box is E, the setting
actual address is 5, then the actual address 5 and virtual address 6, will be displayed
on the centralized controller, that is to say, it equals to two indoor units, and the states
of four indoor units will be kept in the same;
6) The network address is the same as the indoor unit address, no need to setting sepa-
rately.
5.1 Application control
Refer to the specific manuals "AHU AHU Control box" and "Wired Controller" sup-
plied with the unit; below are explained the main instructions.
Set the PCB code of the indoor unit electric control box by different usage.
After setting, be sure to turn off the total power switch and then switch on.
The setting function can not be carried out if not to turn off the total power switch and then
switch on (SW4-2, ENC1).
5.3 - Checks before start up
Before starting the unit check the following:
• Anchorage of the unit to the ceiling.
• Connection of the air ducts.
• Connection of the earth cable.
• Fixing of all the electric terminals
SW4-2 ENC1 Corresponding Virtual Addresses Qty of Occupied
Addresses
00~D No virtual address 1
0 E-F Actual address +1 / / / / 2
00-1 Actual address +1 / / / / 2
02-4 Actual address +1 Actual address +2 Actual address +3 / / 4
Table. 5-2
Table 5-1 Capacities of SW4-2 and ENC1
SECTION 5 - SETTINGS MODULE




')#&* 
$(

')#&* 













$(



KAHU-90.4
$(
$(
$(
$(
$(
$(
$(



KAHU-200.4
$(
$(
$(
$(
$(
$(
$(

KAHU-360.4
$(




$(
$(
$(
KAHU-560.4
$(
$(
Capacity Capacity
- Function specification:
SW4-2, ENC1 - Cooling capacity setting, set the
cooling capacity of this machine (Table. 5-1).
DipSW factory settings:
SW1: 0000 (leaving the differential for thermo-off
in cooling by default at 0 ° C)
SW2: 0000
SW3: 0001 (compensation in heating 2 ° C, the
only dipSW to actually move)
SW4: 0000
SW9: 000
SW10: 00 (identifies UTA kit size)
Capacity settings:
- KRE-500DX1
(3 kW in cooling) -> 1HP -> SW4-2=0, ENC1=1
- KRE-1000DX1
(5,8 kW in cooling) -> 2HP -> SW4-2=0, ENC1=4

pag. 20
5.4 Module setting indications
SECTION 5 - SETTINGS MODULE
1) Definitions of each bit of SW1:
ON
1234
SW1-1 is 0: shutdown compensation
temperature (cooling) is 0°C (factory
default)
SW1-1 is 1: shutdown compensation
temperature (cooling) is 2°C (outlet
air temperature control is invalid)
SW1-2 is 0: AHU control box provides
three fan speeds (factory default)
SW1-2 is 1: only one fan speed
Valid for the
master unit only
ON
1234
Valid for the
master unit only
SW1-3 and SW1-4 are 00: the
number of slave AHU control boxes
connected in parallel is 0 (factory
default); valid for the master unit
ON
1234
Valid for the
master unit only
SW1-3 and SW1-4 are 01: the
number of slave AHU control boxes
connected in parallel is 1
SW1-3 and SW1-4 are 10: the
number of slave AHU control boxes
connected in parallel is 2
SW1-3 and SW1-4 are 11: the
number of slave AHU control boxes
connected in parallel is 3
ON
1234
Valid for the
master unit only
ON
1234
Valid for the
master unit only
ON
1234
Valid for the
master unit only
2) Definitions of each bit of SW2:
ON
1234
SW2-1 is 0: automatic addressing
(factory default)
SW2-1 is 1: clearing AHU control
box address
SW2-2 is 0: no self-check (factory
default)
SW2-2 is 1: self-check
ON
1234
SW2-3 and SW2-4 are 00: master
AHU control box
ON
1234
SW2-3 and SW2-4 are 01: slave
AHU control box 1
SW2-3 and SW2-4 are 10: slave
AHU control box 2
SW2-3 and SW2-4 are 11: slave
AHU control box 3
ON
1234
ON
1234
ON
1234
0 means DIP switch is dialled to “OFF”
1 means DIP switch is dialled to “ON”