Salda AMBERAIR User manual

AMBERAIR
EN ELECTRICAL INSTALLATION, OPERATION AND MAINTENANCE MANUAL

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1. CONTENTS
2. SAFETY PRECAUTIONS 4
3. FANS 5
3.1 FANS WITH AC MOTORS (1 SPEED) 5
3.2 FANS WITH AC MOTORS (2 SPEED) 6
3.3 FANS WITH EC MOTORS 6
3.4 FANS WITH PM MOTORS 11
3.4.1 VSD INTEGRATED ON MOTOR 11
3.4.2 VSD DELIVERED LOOSE (FC101 AND FC102) 12
4. CABLE SELECTION AND CABLE INSTALATION 15
4.1 THREE PHASE RECEIVER POWER SUPPLY CABLE SELECTION 15
4.2 POWER AND CONTROL CABLE INSTALATION 15
5. HEAT RECOVERY SYSTEMS 16
5.1 PLATE HEAT EXCHANGER 16
5.2 ROTARY HEAT EXCHANGER 18
5.2.1 1 ~ PHASE ROTOR MOTOR (W/O CONTROL) 18
5.2.2 3 ~ PHASE ROTOR MOTOR (W/O CONTROL) 19
5.2.3 STEPPING MOTOR WITH CONTROLLER 20
6. HEAT EXCHANGERS 25
6.1 WATER HEATER 25
6.2 WATER COOLER 26
6.3 ELECTRICAL HEATER 27
6.4 GAS-FIRED HEATER 28
7. HUMIDIFIERS 29
7.1 STEAM HUMIDIFIER 29
7.2 EVAPORATIVE HUMIDIFIER 29
8. AIR FILTER SECTION 30
9. DAMPER SECTION 31
10. CONTROL SYSTEM 33
11. ACCESSORIES 35
11.1 FAN SAFETY SWITCH 35
11.2 SECTION LIGHTING 35
11.3 TEMPERATURE SENSORS (WITH INTEGRATED CONTROL SYSTEM) 35
11.4 DUCT SMOKE DETECTOR (WITH INTEGRATED CONTROL SYSTEM) 35
11.5 CO2DUCT AND ROOM SENSOR (WITH INTEGRATED CONTROL SYSTEM) 36
11.6 HUMIDITY DUCT AND ROOM SENSOR (WITH INTEGRATED CONTROL SYSTEM) 36
12. UNIT ASSEMBLING 37
13. UNIT’S BASE FRAME GROUNDING 38
14. CHECKLIST FOR UNIT START-UP AND MAINTENANCE 39

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2. SAFETY PRECAUTIONS
• All work in connection with the assembly, installation and commissioning of the unit must be carried out by specially trained personnel. The unit
can only be taken into operation if it has been assembled in accordance with these installation and operation manual. All protective devices must
be e󰀨ective.
• Do not use the unit for purposes other than its intended use. Use the unit only for the air handling (air ltration, heating, cooling, humidifying,
dehumidifying and mixing).
• Use special clothing and be careful while performing maintenance and repair jobs.
• Do not place ngers or other foreign objects through inlet or exhaust guards or into connected duct. Should a foreign object enter the unit, im-
mediately disconnect power source. Before removing foreign object, make sure that any mechanical motion has stopped, the heater has cooled
down and the restart of the unit is not possible.
• Do not connect to any other power voltage source than indicated in the documentation and identication plate.
• Do not place or operate unit on unsteady surfaces and base frames. Mount the unit rmly to ensure safe operating.
• Do not use water or another liquid to clean electrical parts or connections. If you notice water on electrical parts or connections, stop operating
the unit.
• Do not make any electrical connections when the power is on.
• Before maintenance and repair, the unit must be switched o󰀨 by the supply-disconnecting device, which must be locked with a padlock.
• Before cleaning with steam, make sure that there are no people inside the unit.
• For work on unit elements and assemblies that not covered in this document, refer to the separate manual.
• Air handling units must be properly grounded.
• Always observe all relevant local standards and statutory regulations.
• Do not use the unit if external connections are broken or damaged. If there are any defects, stop operating the unit and replace the damaged
parts immediately. That can be performed only by qualied electrician

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3. FANS
Direct-driven centrifugal fans (plug fans) with one of the following motor:
• AC motor;
• EC motor;
• PM motor.
Important:
Electrical connection may only be undertaken by technically trained personnel.
Before making the electrical motor connections, compare the connection specications with the specications on the motor identication plate.
Identication plate is attached on the inner side of the motor cover or provided in the technical table on the motor.
Motor thermal protections (if any) must be connected to disconnect the motor from the power supply network in case of motor overheating.
Electric motor must be grounded. Ground terminal or screw is designed for the motor and labeled with “PE” or symbol .
If the fans safety switch is used for connection of the motor, then activation of it must be prevented during service works on the device (by
attaching lock on the handle).
3.1 FANS WITH AC MOTORS (1 SPEED)
Three phase single speed motors can normally be connected for two di󰀨erent voltage ranges (connection in star - higher voltage, or delta - low-
er voltage).
(1) (2)
Figure 3.1.1 – AC motor (1 speed) wiring diagram for Delta (Δ) and Star (Y) connection.
(1) - Delta (Δ) connection 230V (400V); (2) - Star (Y) connection 400V (690V).
Motor starters
Excessive motor temperature due to overloading or failure of one phase can be prevented by using a motor starter. The current at which the starter
trips should be set in accordance with motor nameplate data. In certain cases a standard starter will not give su󰀩cient protection. This applies
to applications with particularly severe duties e.g. starting of loads with high inertia, with the use of inverters, and use in environments with large
changes in ambient temperature. In these cases, winding protection by thermal cut-outs or thermistors should be specied.
Thermal cut-outs
Thermal cut-outs is tted to the motor winding. When the xed temperature is exceeded the cut-out will break an electric circuit e.g. to a contactor
which will turn o󰀨 the motor. The switching contact is a temperature sensitive bimetal spring.
Thermistors
Protection is provided by thermistors tted in the frame 160 and up motor windings, together with a sensing relay. Thermistors are temperature
sensitive resistors that at a certain temperature have a wide change of resistance. The sensing relay can, in turn, be used to e.g. cut o󰀨 supply to
the main contactor coil.
Thermal protection contacts of the motor (if any) must be connected using the terminals in the motor junction box.
NOTE: For more information, control, maintenance, diagnostics and troubleshooting refer to AC motors technical specication
Rotation direction
Three-phase motor rotation direction can be changed by switching two of the power supply phases:
(1) (2)
Figure 3.1.2 – Change of rotation for three-phase AC motor:
(1) – clockwise (CW) rotation; (2) – counter clockwise (CCW) rotation;
When frequency converters are used for control of AC motors, shielded cables must be used for connection.
Metal cable glands (EMC) must be used at AC motors connection box.
Before connecting to the motor, cables must be installed through the seals at junction box, which grounds the cable shield part.

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General:
Before starting any inspection work, fans must be disconnected from voltage and all safety requirements must be followed.
Possible solutions if the fan does not rotate:
• Check connectors and contacts;
• Check if the electrical connection of the motor is correct;
• Check if the wires of the control cable is not mixed;
• Check if the voltage supplied to the motor;
• Check if motor safefty switch is turned on;
After starting the device, check if:
• The motors rotate smoothly, do not vibrate and do not produce side noise;
• Airow produced by the device matches air direction indicated on the housing;
• Thermal protections of the motor are not activated;
• Overcurrent (overload) protections of the motor are not activated;
• Motor speed changes when adjusting the control (when the device has built-in control system).
3.2 FANS WITH AC MOTORS (2 SPEED)
(1) (2)
Figure 3.2.1 – AC motor (2 speed) wiring diagram:
(1) - Low speed Star (Y) connection; (2) - High speed Double Star (YY) connection.
Thermal protection contacts of the motor (if any) must be connected using the terminals in the motor junction box.
NOTE: For more information, control, maintenance, diagnostics and troubleshooting refer to AC motors technical specication
General:
Before starting any inspection works, fans must be disconnected from voltage and all safety requirements must be followed.
Possible solutions if the fan does not rotate:
• Check connectors and contacts;
• Check if the electrical connection of the motor is correct;
• Check if the wires of the control cable is not mixed;
• Check if the voltage supplied to the motor;
• Check if motor safefty switch is turned on;
After starting the device, check if:
• The motors rotate smoothly, do not vibrate and do not produce side noise;
• Airow produced by the device matches air direction indicated on the housing;
• Thermal protections of the motor are not activated;
• Overcurrent (overload) protections of the motor are not activated;
• Motor speed changes when adjusting the control (when the device has built-in control system).
3.3 FANS WITH EC MOTORS
Figure 3.3.1 – EC fans with connection box (Motor size “D” and “G”):
(1) - Cover of controller housing; (2) - Cable glands + seal insert for two cables (applicable only if necessary): motor size “D”: 3 x M16 + 1 x seal
insert with two holes 5 mm; motor size “G”: 3 x M20 + 1 x seal insert with two holes 6 mm; (3) - Cable entry points with plastic fastener; (4) -

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Mains connection; (5) - Connection alarm relay; (6) - Connection contols; (7) - Slot for add-on module.
Cable connection procedure:
1. Remove the cover from the controller housing for the connection.
2. All 3 cable entry points are in a sealed condition at delivery. Remove plastic fastener if necessary, and insert enclosed cable glands, entry points
that are not used must remain sealed!
3. When using the seal insert for two cables it is not permissible to use the corresponding cable gland with only one cable.
4. Insert and connect lines correctly.
5. Attach cover of controller housing again carefully in correct position before startup.
Wiring diagram:
Figure 3.3.2 – EC motor (3 ~ phase) wiring diagram:
(1) - Line voltage → Rating plate (3 ~ type not suitable for IT network); (2) - Contact rating max. AC 250V; 2A; (3) - External speed setting; (4) –
Input 0…10VDC
Figure 3.3.3 – EC motor (1 ~ phase) wiring diagram:
(1) - Contact rating max. AC 250V; 2A; (2) – Ground connection terminal (PE); (3) – Neutral connection terminal (N); (4) – Phase connection
terminal (L1);
Diagnostics / Faults
Status Out with ash code
Figure 3.3.4 - Status LED integrated in cover for motor size “D” and
“G”.
Figure c
LED CODE RELAYS K1* CAUSE (EXPLANATION) REACTION OF CONTROLLER (AJUSTMENT)
OFF de-energized,
11 - 14 inter-
rupted
no line voltage Line voltage available?
Unit switch OFF and automatically ON when the voltage has
been restored

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ON energized, 11 -
14 bridged
Normal operation without fault
1 x energized, 11 -
14 bridged
no enable = OFF
Terminals “D1” - “24 V / 10 V” (Digital In
1) not bridged
Switch OFF by external contact (digital input).
2 x energized, 11 -
14 bridged
Active temperature management
The device has an active temperature
management to protect it from damage
due to too high inside temperatures. In
case of a temperature rise above the
xed limits, the modulation is reduced
linearly. To prevent the complete system
being switched o󰀨 externally (in this
operation permissible for the controller) in
case of reduced operation due to too high
an internal temperature, no fault message
is sent via the relay.
With a drop in temperature the modulation rises again llinear.
Check cooling of the controller
3 x de-energized,
11 - 14 inter-
rupted
HALL-IC
Incorrect signal from the Hall-ICs,
error in the commutation.
Internal plug connection faulty
The controller switches the motor o󰀨.
Automatic restart if no faults are recognised.
Replace fan / motor
4 x de-energized,
11 - 14 inter-
rupted
Line failure (only for 3 ~ types)
The device is provided with a built-in
phase-monitoring function for the mains
supply. In the event of a mains interrup-
tion (failure of a fuse or mains phase) the
unit switches o󰀨 after a delay (approx.
200 ms).
Only functioning with an adequate load
for the controller.
Following a shuto󰀨, a startup attempt is made after approxi-
mately 15 seconds, if the voltage supply is high enough. This
keeps occurring until all 3 supply phases are available again.
Check power supply
5 x de-energized,
11 - 14 inter-
rupted
Motor blocked
If after 8 seconds of commutation no
speed is measured > 0, the fault “Motor
blocked” is released
EC-Controller switches o󰀨, renewed attempt to start after about
2.5 sec.
Final shuto󰀨, when fourth starting test fails.
It is then necessary to have a reset by disconnecting the line
voltage.
Check if motor is freely rotatable.
6 x de-energized,
11 - 14 inter-
rupted
IGBT Fault
Short circuit to earth or short circuit of the
motor winding
EC-Controller switches o󰀨, renewed attempt to start after about
60 sec.
Code 9.
Final shuto󰀨, if - following a second starting test – a second fault
detection is detected within a period of 60 seconds.
It is then necessary to have a reset by disconnecting the line
voltage.
7 x de-energized,
11 - 14 inter-
rupted
DC undervoltage
If the DC-link voltage drops below a spec-
ied limit the device will switch o󰀨
If the DC-link voltage rises above the limit within 75 seconds,
then the cotroller will attempt to start.
Should the DC-link voltage stay for more than 75 seconds be-
low the limit, the device will switch o󰀨 with a fault message.
8 x de-energized,
11 - 14 inter-
rupted
DC overvoltage
If the DC-link voltage increases above a
specied limit, the motor will switch o󰀨.
Reason for excessively high input voltage
or alternator motor operation
If the DC-link voltage drops below
the limit within 75 seconds, then the cotroller will attempt to
start.
Should the DC-link voltage stay
above the limit for more than 75 seconds, the device will switch
o󰀨 with a fault message.
9 x energized, 11 -
14 bridged
IGBT cooling down period IGBT cooling down period for approx.
60 sec.
Final shuto󰀨 after 2 cooling-o󰀨 intervals Code 6
11 x de-energized,
11 - 14 inter-
rupted
Fault motor start
If a starting command is given (enable
available and Setpoint > 0) and the
motor does not start to turn in the correct
direction within 5 minutes, then an error
message will appear
If it is possible to start the motor in the target direction of rota-
tion after the error message, the error message will disappear.
Should a voltage interruption occur in the meantime, the time
taken up to the switch o󰀨 will begin again.
Check if motor is freely rotatable.
Check if the fan is driven in reverse direction by an air stream (
Behaviour in rotation by air current in reverse direction)
12 x de-energized,
11 - 14 inter-
rupted
line voltage too low
If the DC-link voltage drops below a spec-
ied limit the device will switch o󰀨
If the line voltage rises above a specied limit within 75 sec-
onds, then the controller will attempt to start.
Should the line voltage stay below the specied limit for more
than 75 seconds, the device will switch o󰀨 with an error mes-
sage
13 x de-energized,
11 - 14 inter-
rupted
Line voltage too high
Cause to high input voltage
If the line voltage increases above a
specied limit, the motor will switch o󰀨
If the line voltage drops below the specied limit within 75 sec-
onds, then the controller will attempt to start.
Should the line voltage stay above the specied limit for more
than 75 seconds, the device will switch o󰀨 with an error mes-
sage.

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14 x de-energized,
11 - 14 inter-
rupted
Error Peak current
If the motor current increases above the
specied limit (even in a short time-
frame) the device will switcho󰀨.
After a switch o󰀨 the controller waits for 5 seconds then the
controller attempt a start.
Arises within 60 sec. in series 5 further disconnections a nal
switch o󰀨 with fault indication follows.
Should no further switch o󰀨 be exceeded in 60 sec. the counter
will be reset.
17 x de-energized,
11 - 14 inter-
rupted
Temperature alarm
Excess of the max. permissible inside
temperature
Controller switches o󰀨 motor. Automatic restarting after cooling
down.
Check cooling of the controller
* K1: programmed function at factory: Fault indication not inverted
Add-on modules
If required, an auxiliary module can be retrotted to the designated slot for motor size “D”, “G”. The extended scope of function is specied in the
documentation for the auxiliary module.
349046 Premium Module
When the auxiliary module is plugged in the controller in the fan is extended to become a full-grade multipurpose controller. For example, “Premi-
um module” provides not only an integrated MODBUS interface, it also enables sensors to be connected straight to the fan.
The module also comes with two analogue inputs and one analogue output.
Mounting the module:
Danger due to electric current
• Always read the safety instructions chapter before mounting!
• The fan in which the module is to be installed must be disconnected from the line voltage for at least 3 minutes before opening!
Attention, electrostatic sensitive devices!
• Damage to electronic components by electrostatic charging must be prevented!
• Touch the protective earth connection in the terminal to equalize the potential immediately before removing the module from the packing. This
applies regardless of whether the device is already connected to the line.
• Equalize the potential again shortly before installation if the module is not installed immediately after unpacking.
• After unpacking the module, check for possible transport damage and insert it in the slot provided. Do not touch the connection!
Procedure:
Mount the module in the housing with the two enclosed screws (permissible tightening torque MA =1.3 Nm)
Figure 3.3.6 - Mounting the module
NOTE: For more information, control, maintenance, diagnostics and troubleshooting refer to EC motors and Add-on modules technical
specication.
FanWall
For bigger air handling units, where more air ow is needed, fan wall can be selected (from 2 to 20 EC fans).
Control types for EC fan wall:
• Control with EMR’ex
No additional add-on modules are needed.
All fans are controlled with 0-10V signal.

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NOTE: Breakdown of EC fan can only be recognized via fault relay.
• Control with UNIcon as MODBUS Master
All EC fans are equipped with AM-MODBUS modules.
NOTE: Breakdown of EC fan can be recognized via MODBUS communication line.
NOTE: For both control types an external control signal is needed.
For more information, control, maintenance, diagnostics and troubleshooting refer to EMR‘ex and UNIcon technical specication.
General:
Before starting any inspection works, fans must be disconnected from voltage and all safety requirements must be followed.
Possible solutions if the fan does not rotate:
• Check connectors and contacts;
• Check if the electrical connection of the motor is correct;
• Check if the wires of the control cable is not mixed;
• Check if the voltage supplied to the motor;
• Check if motor safefty switch is turned on;
After starting the device, check if:
• The motors rotate smoothly, do not vibrate and do not produce side noise;
• Airow produced by the device matches air direction indicated on the housing;
• Thermal protections of the motor are not activated;
• Overcurrent (overload) protections of the motor are not activated;
• Motor speed changes when adjusting the control (when the device has built-in control system).
3.4 FANS WITH PM MOTORS
Direct on-line connection is not possible for permanent magnet motors. Speed controller is always needed. This controller has special algorithm
for PM motors. Speed controller is programmed with fan and motor specic parameters.
PM motor speed controller types:
• VSD integrated on motor;
• VSD delivered loose (FC101 and FC102).
3.4.1 VSD INTEGRATED ON MOTOR
Integrated on motor means that the frequency controller is mounted at the side of the fan. If the fan service side is on the other side, the drive can
easily be moved there by opening four screws. Cabling between motor and drive is already done. Built-on version is ready to be used and needs
only power from mains and control signals. They can be easily connected to the terminals under the drive’s plastic cover.

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Figure 3.4.1.1 – PM motor with VSD integrated on motor
Built-on frequency controller and PM motor connection diagram
Figure 3.4.1.2 Built-on frequency inverter and PM motor connection diagram:
(1) – PM motor; (2) – Frequency converter; (3) – Remote control (hand terminal).
Built-in protection
If the temperature inside frequency converter exceeds +95°C, the frequency converter will attempt to reduce its internal heat generation by reduc-
ing motor speed (rpm).
Frequency converter has built-in current limitation for the protection of motor and cables and cannot therefore supply more current than it is set to.
In the event of lacking phase on the supply input, the frequency converter will reduce speed and activate a non-critical alarm.
The frequency converter motor output terminals are short circuit protected against phase-to-phase short circuiting.
Alarms
Frequency converter has a built-in alarm monitor, which monitors optimal fault-free operation and triggers an alarm if operating or performance
problems are observed.
• ”Critical” alarms stop the motor.
• ”Non-critical” alarms reduce motor performance.
• The built-in alarm monitor stops the frequency converter.
• If the alarm situation passes, the alarm is automatically reset and frequency converter restarted.
• If the maximum number of restarts (5 times/60 min) is exceeded, the alarm must be reset manually. The alarm can be reset by means of a
Modbus command.
• The alarm is automatically reset if the power is disconnected for longer than 60 seconds.
• Alarms can be read via Modbus.
Maintenance
Frequency converter is maintenance free under normal operating conditions and load proes.
• The cooling fns must be kept free of dust, dirt and other foreign matter so that air can pass freely over them. Deposits of dust, dirt or other foreign
matter on and between the cooling fns will prevent cooling of the frequency converter and thus impair performance.
• The cooling fns may become very hot. (Max. +95°C under normal operating conditions).
• Frequency converter cannot be repaired on site. Never attempt to repair a defective unit. Contact your supplier to obtain a replacement.

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3.4.2 VSD DELIVERED LOOSE (FC101 AND FC102)
1 2
FC101 and FC102 frequency converters are delivered loose. They are to be mounted by the customer.
Figure 3.4.2.1 – PM motor speed controller: (1) - FC101 Frequency controller; (2) - FC102 Frequency controller;
Separate speed controller should be mounted near the fan. Motor cable shall not be no longer than 10 m. With longer cables some motor param-
eters should be changed. Speed controller is delivered with 3.5 m motor cable for fan sizes up to 050. For bigger fans motor cable length is 4.5 m.
Figure 3.4.2.2 – IP54 and IP55 frequency converter mounted at AHU casing.
FC101 and FC102 frequency controller and motor connection diagram
Figure 3.4.2.3 FC101 and FC102 frequency inverter, AHU controller and PM motor connection diagram:
(1) – PM motor; (2) – Frequency converter; (3) – AHU controller.
PM motor control terminals and functions:
TERMINAL NUMBER FUNCTION CONFIGURATION FACTORY SETTING
12 +24 V output
18 Digital input *PNP/NPN Start
19 Digital input *PNP/NPN No operation
20 Com

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27 Digital input *PNP/NPN Coast inverse
29 Digital input *PNP/NPN Jog
50 +10 V output
53 Analog input *0-10 V/0-20 mA/ 4-20 mA Ref1
54 Analog input *0-10 V/0-20 mA/ 4-20 mA Ref2
55 Com
42 12 bit *0-20 mA/4-20 mA/DO Analog
45 12 bit *0-20 mA/4-20 mA/DO Analog
1, 2, 3 Relay 1 1,2 NO 1,3 NC [9] Alarm
4, 5, 6 Relay 2 4,5 NO 4,6 NC [5] Drive running
* indicates default setting
Note: PNP/NPN is common for terminals 18, 19 and 27
Installation Checklist
Before completing installation of the unit, inspect the entire installation as detailed in Table below. Check and mark the items when completed:
INSPECT FOR DESCRIPTION
Auxiliary equipment • Look for auxiliary equipment, switches, disconnects, or input fuses/circuit breakers that may reside on the input
power side of the frequency converter or output side to the motor. Ensure that they are ready for full-speed operation
• Check function and installation of any sensors used for feedback to the frequency converter
• Remove any power factor correction caps on motor(s)
• Adjust any power factor correction caps on the mains side and ensure that they are dampened
Cable routing • Ensure that motor wiring and control wiring are separated or screened or in 3 separate metallic conduits for
high-frequency interference isolation
Control wiring • Check for broken or damaged wires and loose connections
• Check that control wiring is isolated from power and motor wiring for noise immunity
• Check the voltage source of the signals, if necessary
• The use of screened cable or twisted pair is recommended. Ensure that the shield is terminated correctly
Cooling clearance • Measure that top and bottom clearance is adequate to ensure proper air ow for cooling.
Ambient conditions • Check that requirements for ambient conditions are met
Fusing and circuit break-
ers
• Check for proper fusing or circuit breakers
• Check that all fuses are inserted rmly and are in operational condition and that all circuit breakers are in the open
position
Grounding • Check for su󰀩cient ground connections that are tight and free of oxidation
• Grounding to conduit, or mounting the back panel to a metal surface, is not a suitable grounding
Input and output power
wiring
• Check for loose connections
• Check that motor and mains are in separate conduit or separated screened cables
Panel interior • Inspect that the unit interior is free of dirt, metal chips, moisture, and corrosion
• Check that the unit is mounted on an unpainted, metal surface
Switches • Ensure that all switch and disconnect settings are in the proper positions
Vibration • Check that the unit is mounted solidly, or that shock mounts are used, as necessary
• Check for an unusual amount of vibration
NOTE: For more information, control, maintenance, diagnostics and troubleshooting refer to PM motors technical specication.

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4. CABLE SELECTION AND CABLE INSTALATION
4.1 THREE PHASE RECEIVER POWER SUPPLY CABLE SELECTION
Various conditions must be evaluated before selecting cable cross-section area:
• Power;
• Current;
• Starting currents;
• Operating conditions;
• Voltage drop;
• Mounting type;
• Ambient temperature;
Current-carrying capacity of PVC insulated copper conductors or cables under steady-state conditions in an ambient air temperature of +40 °C for
di󰀨erent methods of installation (EN 60204-1:2006):
INSULATION METHODS
B2 C E
Cross-sectional area, mm2Current-carrying capacity I for three phase circuits, A
0.75 8,5 9,8 10,4
1.0 10,1 11,7 12,4
1.5 13,1 15,2 16,1
2.5 17,4 21 22
4 23 28 30
630 36 37
10 40 50 52
16 54 66 70
25 70 84 88
35 86 104 110
50 103 125 133
70 130 160 171
95 156 194 207
120 179 225 240
The voltage drop from the point of supply to the load shall not exceed 5 % of the nominal voltage under normal operating conditions. In order
to conform to this requirement, it can be necessary to use conductors having a larger cross-sectional area than that derived from selection list.
Methods of conductor and cable installation independent of number of conductors/cables
Figure 4.1.1 - B2 Cables in conduit and cable
trunk systems
Figure 4.1.2 - C Cables on walls Figure 4.1.3 - D Cables on open cable trays
4.2 POWER AND CONTROL CABLE INSTALATION
Shielded cables recommended during installation.
One end of the cable screen must be grounded at the control box ground terminal.
Power and control cables should be separated during installation (minimum distance 50 mm).
Separated cable ducts and di󰀨erent cable glands should be used for power and control cables.

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5. HEAT RECOVERY SYSTEMS
5.1 PLATE HEAT EXCHANGER
In the plate heat exchanger, the warm extract air and the cool fresh air, separated by thin plates, pass each other in counter-ow. No mixing of the
two air streams takes place. Therefore, the transmission of dirt, odours, moisture, bacteria, etc. is impossible. Heat transmitted from extract air to
fresh air purely by conduction because of the temperature di󰀨erence between the two air streams: the warm extract air cooled down and the cool
fresh air heated up.
Heat exchanger section divided in separate parts from size 12-KR due transportation reasons. Refer to separate assembly manual for assembly
of such section.
Figure 5.1.1 - Cross-ow heat exchanger section.
5 – Heat exchanger, 6 – by-pass damper, 7 – by-pass chamber, 8 – condensate tray, 9 – xing bolts.
Plate heat exchanger is equipped with by-pass damper.
By-pass damper is controlled with modulating actuator (0-10V).
The actuator is controlled by means of a standard control signal DC 0 ... 10 V. It opens to the position dictated by this signal. The measuring voltage
U allows the damper position (0 ...100%) to be electrically indicated and serves as a follow-up control signal for other actuators.
Simple direct mounting on the damper spindle with a universal spindle clamp, supplied with an anti-rotation strap to prevent the actuator from
rotating.
Manual operation is possible with the pushbutton (the gear is disengaged for as long as the button is pressed or remains locked).
Adjustable angle of rotation with mechanical end stops.
The actuator is overload-proof, requires no limit switches and automatically stops when the end stop is reached.
Safety notes:
Assembly must be carried out by trained personnel. Any legal regulations or regulations
issued by authorities must be observed during assembly.
By-pass actuator electrical wiring diagram:
Figure 5.1.2 – Modulating actuator (0-10V) wiring diagram
The actuator rotation direction can be changed.
Figure 5.1.3 – Changing the rotation direction of the actuator

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By-pass actuator electrical instalation
NOTE: For more information, control, maintenance, diagnostics and troubleshooting refer to actuator technical specication.
For indoor swimming pool premises, by-pass damper actuator is selected with higher protection class (IP66/67). Optimum protection against
corrosion and chemical inuences, UV radiation, damp and condensation.
Figure 5.1.4 – Damper actuator with IP66/IP67 protection class
Before conecting power and control cables, actuators protective cover needs to be oped.
At the certain weather conditions the heat exchanger starts to freeze. Heat exchanger plates can be damaged during ice formation. To ensure it
does not happens the heat exchanger is equipt with the pressure switch (relay).
During ice formation air ow though heat exchanger plates decreases. Pressure builds up and the pressure switch is activated.
Activated pressure switch indicates alarm and precautions must be taken.

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Figure 5.1.5 – Palate heat exchanger pressure switch and tubes mounting principal scheme:
GP3 – Heat exchanger pressure switch (relay) with „+“ and „-“ pressure tubes; ST3 – By-pass damper aqtuator; (1) – Supply air ow; (2) –
Fresh air ow; (3) – Exhaust air ow; (4) – Extract air ow.
5.2 ROTARY HEAT EXCHANGER
Rotary heat exchangers are regenerators with rotating heat accumulators. The heat-dissipating and heat-absorbing air ows heat or cool the
rotating, air-permeable storage accumulator. Depending on the air conditions and the surface of the accumulator material, moisture may also be
transferred in the process. Self-cleaning e󰀨ect due counter-ow supply. Double deck arrangement.
Rotary heat exchanger section divided in separate parts from size 12-KR due transportation reasons. Refer to separate assembly manual for
assembly of such section.
Electrical connection:
• Electrical connection may only be undertaken by technically trained personnel.
• Rotors can be equipped with 1-phase motor (w/o control), 3-phase motor (w/o control) or stepping motor with controller.
• Do not route the wires through the heat exchanger’s casing. Otherwise it will be impossible to pull out heat exchanger in case the maintenance
needed without help of electrician.
Important:
Some rotary heat exchangers are delivered with rubber transportation locks 6 which prevent rotor wheel from deformation. These rotary heat
exchangers are marked with special warning label on the section. Remove rubber transportation locks before connecting rotary heat exchanger
section to other section of the AHU otherwise the unit will not work properly.
Figure 5.2.1 - Rotary heat exchanger section.
1 – Panel blocks, 2 – removable panel, 3 – fastening elements, 4 – casing, 5 – rotary heat exchanger, 6 - rubber transportation locks.
5.2.1 1 ~ PHASE ROTOR MOTOR (W/O CONTROL)
Capacitor 1,5uF is used for motor connection. Capacitor is supplied with the motor as the device is delivered without any control system.
Connection diagram and rotation direction of the single-phase induction motor:
Figure 5.2.1.1 – Single-phase rotor motor connection - clockwise
(CW) rotation:
Figure 5.2.1.2 – Single-phase rotor motor connection - counterclock
wise (CCW) rotation:
(1) – Red (Main) wire; (2) - White wire; (3) – Black (blue) wire; (4) – Capacitor 1,5uF.

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Recommended cable cross-sectional area (mm2) for connecting 1-phase rotor motor:
CABLE CONDUCTOR CROSS-SECTIONAL AREA, mm2PURPOSE
1.5 Motor power supply cable
NOTE: Rotor motor must be grounded. Ground wire must be connected to the ground screw at the motor junction box, and the other
end of the wire must be connected to the ground loop of the device.
General:
If rotor does not rotate, check if:
• All cable connections (if any) are connected;
• Rotor motor is properly connected;
• Power supply voltage matches voltage indicated on the rotor motor plate;
After starting the device, inspect:
• Rotor rotation direction. It has to match to the direction of indicated sticker (if any);
• Operation of the rotation sensor (if any);
5.2.2 3 ~ PHASE ROTOR MOTOR (W/O CONTROL)
Three phase single speed motors can normally be connected for two di󰀨erent voltage ranges (connection in star - higher voltage, or delta - lower
voltage)
(1) (2)
Figure 5.2.2.1 – AC motor (1 speed) wiring diagram for Delta (Δ) and Star (Y) connection.
(1) - Delta (Δ) connection 230V (400V); (2) - Star (Y) connection 400V (690V).
Thermal cut-outs
Thermal cut-outs is tted to the motor winding. When the xed temperature is exceeded the cut-out will break an electric circuit e.g. to a contactor
which will turn o󰀨 the motor. The switching contact is a temperature sensitive bimetal spring.
Thermal protection contacts of the motor (if any) must be connected using the terminals in the motor junction box.
Rotation direction
Three-phase rotor motor rotation direction can be changed by switching two of the power supply phases:
(1) (2)
Figure 5.2.2.2 – Change of rotation for three-phase rotor AC motor:
(1) – clockwise (CW) rotation; (2) – counterclockwise (CCW) rotation;
NOTE: Rotor motor must be grounded. Ground wire must be connected to the ground screw at the motor junction box, and the other end of the
wire must be connected to the ground loop of the device.
NOTE: For more information, control, maintenance, diagnostics and troubleshooting refer to AC motors technical specication
Recommended cable cross-sectional area (mm2) for connecting 3-phase rotor motor:
CABLE CONDUCTOR CROSS-SECTIONAL AREA, mm2PURPOSE
1.5 Motor power supply cable
0.5 Motor thermal cut-out cable
NOTE: Rotor motor must be grounded. Ground wire must be connected to the ground screw at the motor junction box, and the other end of the
wire must be connected to the ground loop of the device.

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General:
If rotor does not rotate, check if:
• All cable connections (is any) are connected;
• Rotor motor is properly connected;
• Power supply voltage matches voltage indicated on the rotor motor plate;
• Thermal protection of the motor is activated (if any). When thermal protection is activated, contact becomes open (NO).
After starting the device, inspect:
• Rotor rotation direction. It has to match to the direction of indicated sticker (if any);
• Operation of the rotation sensor (if any);
Inductive rotation sensor
Single phase and three phase rotor (w/o control) can be equipped with inductive rotation sensor.
Rotation sensor can be used to identify if the rotor belt is broken or some other problems occurs.
Periodically perform the following checks to ensure stable operation of the sensor:
Check for mounting position, dislocation, looseness, or distortion;
Check for loose wiring and connections, improper contacts, and line breakage;
Check for attachment or accumulation of metal powder or dust;
Check for proper lighting of indicators (for models with a set indicator.)
Never disassemble or repair the Sensor.
Figure 5.2.2.3– Inductive rotor sensor electrical wiring connection scheme
(1) – Brown; (2) – Black; (3) – Blue; (4) – Inductive rotor sensor cable;
5.2.3 STEPPING MOTOR WITH CONTROLLER
Step motor and controller type depends on the size of the unit:
Stepmotor controllers are OJ-DRHX series, EMX-R-..E or Varimax25;
Recommended cable cross-sectional area (mm2) for connecting step motor controller:
CABLE CONDUCTOR CROSS-SECTIONAL AREA, mm2PURPOSE
1.5 Motor power supply cable
0.5 Motor thermal cut-out cable
OJ-DRHX series
The DRHX series covers the range from 2Nm to 14Nm with both Modbus and analogue control.
The DRHX is equipped with a software that monitors the rotation of the rotor, which means that no physical/optical rotor guard is required.

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OJ-DRHX-2-8Nm
Figure 5.2.3.1 – stepmotor controller OJ-DRHX-2-8Nm
NO. DESCRIPTION NO. DESCRIPTION
1 Test button 5 RJ12 Modbus connector (2 x RJ12)
2 4-pole DIP switch 6 A/D control and signal terminals, depending on variant
3 LED 7 Supply terminals (L, N, PE)
4 3 x 7-segment display - depending on variant 8 Connection terminals for stepper motor (U, V, W, PE)
Figure 5.2.3.2 – stepmotor controller OJ-DRHX 2-8Nm electrical connection scheme.
NOTE: The extension stepper motor cable should be connected to the terminals marked: “U” – Brown; ”V” – Black; ”W” – Blue; “PE” - Yellow/
Green
OJ-DRHX-14Nm
Figure 5.2.3.3 – stepmotor controller OJ-DRHX-14Nm

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NO. DESCRIPTION NO. DESCRIPTION
1 Stepper motor connections (U, V, W, PE) 5 RJ12 Modbus connector
2 Connection terminals for future use 6 3-point strain relief for Modbus cable (ribbon cable)
3 Connector for optional module 7 Supply terminals (L, N, PE)
4 Terminal strip for Modbus and A/D control signals 8 Earth connection (PE)
Figure 5.2.3.4 – stepmotor controller OJ-DRHX-14Nm electrical connection scheme:
NOTE: The extension stepper motor cable should be connected to the terminals marked: “U” – Brown; ”V” – Black; ”W” – Blue; “PE” - Yellow/
Green
ITEM TO BE CHECKED DESCRIPTION OF CHECK
Completion Check that the entire installation is ready to be commissioned, both
electrically and mechanically, before energizing the installation.
Check that no people or animals are present in the vicinity of moving
parts.
Check that the selected stepper motor size meets the required torque
in order to be able to run the specic rotor.
Check that the OJ-DRHX cover has been correctly tted and that both
snap locks have engaged correctly before energizing the product.
Check that all unused cable glands and other unused openings are
appropriately blanked o󰀨 in accordance with the applicable enclosure
rating.
Check that the drive belt is tensioned correctly and that the rotor can
rotate easily and unhindered, with a torque that is less than the rated
torque for the stepper motor.
Make sure that the belt is not tensioned beyond the maximum permis-
sible vertical tension on the stepper motor shaft.
Cabling Check that all cabling has been tted correctly and that stepper motor
and control cables are kept apart in separate cable conduits. The mo-
tor cable must be xed to the chassis of the rotor for its entire length
Check that all cables are securely attached and relieved of tension
and torsion.
Check that all cables are free of visible damage throughout their length.
Electrical installation Check that cables have been correctly inserted into OJ-DRHX and that
the cable glands have been correctly tightened.
Check whether there are any bad electrical connections, as they may
cause overheating and serious damage to the product and to property.
Mains voltage Check that the mains voltage wires have been correctly tted to the
supply terminals: one-phase on terminals ”L”, ”N” and ”PE” and three-
phase on terminals ”L1”, ”L2”, ”L3” and ”PE”.
Check by means of voltage measurement that there is the correct volt-
age on the terminals.
Stepper motor connection Check that the extension cable is properly connected to the OJ-DRHX
terminals: ”U”, ”V”, ”W” and ”PE”