Summary of Contents for Air Trade Centre AHU-04
- Page 1 Think different, be different! User Manual AIR HANDLING UNITS www.airtradecentre.com V.2.2...
- Page 2 Think different, be different! Dear ATC Customer, We are very glad to be together with you. We have full faith on our product that we meticulously manufacture in our modern facilities with reliable engineering solutions and undergoes a stringent quality control process, will offer you the top level of performance.
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Page 3: Table Of Contents
Think different, be different! CONTENTS 1.INTRODUCTION ............................1 1.1 Purpose of the Guide ..........................1 1.2 Warranty Scope and Conditions ......................2 1.3 Safety and Warnings ..........................3 1.3.1 Personal Protective Equipment ..................... 3 1.4 Product and Information Labels ......................4 1.5 Warnings and Preventions ........................ - Page 4 Think different, be different! 4.1.2 BMS Communication Connections....................32 4.1.3 Fire Alarm System Connections ....................33 4.1.4 Dx Coil Connections ........................34 4.1.5 Heating and Cooling Valve Actuator Connections ............... 35 4.1.6 Change Over Sensor Connections ....................35 4.2 Air Handling Units Without The Controlled System ................36 4.2.1 Motor Connections ........................
- Page 5 Think different, be different! 5.3.6 Input/Output Accesses......................... 55 5.4 Alarms ..............................55 5.4.1 Inspect Alarms ..........................57 5.4.2 Acknowledge, Block and Unblock Alarms ..................57 5.4.3 Alarm List ............................. 57 5.5 Touch Screen ............................57 5.5.1 Main Page and Buttons ........................ 57 5.5.2 Sing Up ............................
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Page 6: Introduction
If you need any spare parts, please contact our after-sales service department. The damages caused by the use of spare parts that are not supplied by Air Trade Centre, will not be covered by warranty. -
Page 7: Warranty Scope And Conditions
The warranty does not apply to repairs and modifications made without the written consent of Air Trade Centre, or if the unit is not operated as specified in the agreement with Air Trade Centre. Damage caused by negligence, lack of maintenance or failure to follow Air Trade Centre's recommendations is not covered by the warranty. -
Page 8: Safety And Warnings
Think different, be different! 1.3 Safety and Warnings The instructions in this user manual are prepared for technical personnel, qualified people, competent electricians or air conditioning technicians. They must read and understand the user manual completely before performing any work. Ignoring the safety instructions may result in injury to people or damage to products. -
Page 9: Product And Information Labels
Think different, be different! Do not wear loose clothing or jewelry that can get caught. Do not hitch or climb on the unit. Use recommended tools and equipment specificially designed for the job. Use recommended personal protective equipment when the work requires it. Observe the markings, information and warning labels on the product. - Page 10 Think different, be different! Capacity Label www.airtradecentre.com V.2.2...
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Page 11: Warnings And Preventions
The unit must not be operated without duct connections. The unit must be operated under the operating conditions such as (temperature, humidity, location, etc.) which are specified on the project phase with Air Trade Centre. All electrical connections must be carried out by an authorized electrician and in accordance with local regulations and controls. -
Page 12: Transportation
Think different, be different! 2. TRANSPORTATION During transportation and shipment of the device, full compliance with the instructions specified by the ATC must be ensured. Neglecting the following follow the instructions may have adverse consequences for both personnel and the device. ATC cannot be held responsible for any damage that may occur if the instructions are not followed. -
Page 13: Transport With Forklift
Think different, be different! Lifting and transport operations must be carried out by trained and experienced personnel. When lifting and transporting the device, must not be underneath or in the area of movement. The device must not be tilted or tipped over during transportation or lifting. Unnecessary jerking or rough transporting must be avoided. - Page 14 Think different, be different! If a lifting operation is to be performed with a crane other than the base frame holes, confirmation must be obtained from the manufacturer. The weights of the modules must be checked from the technical output of the air handling unit and the center of gravity must be adjusted as centrally located between the blades as shown below.
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Page 15: Transportation With Crane
Think different, be different! 2.2.2 Transportation With Crane The holes that prepared for crane transportation are located on the corner side of the base frame as shown in the figure below. It should be passed through the lifting holes to the metal bar or rod with the appropriate bearing capacity. - Page 16 Think different, be different! As an alternative to the crane transportation method, transportation can also be done with an eyebolt. According to the weights written on the modules, the eyebolts with the appropriate bearing capacity should be passed through the lifting holes. (Module weights are written on the technical printout) An appropriate lifting beam for the size of the AHU must be used in order to prevent the straps from pressing on the unit, its accessories or the roof.
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Page 17: Transporting Top Modules
Think different, be different! 2.2.3 Transporting Top Modules Upper modules are produced without base frame due to the structure of the air handling units. For this reason, it must be transported in a different way than the previous transportation instructions. First of all, it is required to give the belts a U-Shape and passing them under the device. - Page 18 Think different, be different! After alignment, the upper module must be install on top of the bottom module by removing the transportation pillars respectively. The conveyor belts between the two modules must be removed without damaging the modules. If a lifting operation is to be performed with a crane other than the base frame, the ATC company must be contacted.
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Page 19: Storage
If alternative methods of unit protection are required (e.g. wood, Corex or flame retardant materials), Air Trade Centre must be advised of the specific requirements at the pre-contract stage. The unit must be stored on a flat surface. -
Page 20: Installation
Think different, be different! 3. INSTALLATION Before installation, the weight and dimensions of the Air Handling Unit specified by ATC must be checked to ensure that they are suitable for the area where the unit is to be installed and transported. - Page 21 Think different, be different! The wedges must be removed before the modules are assembled. The precautions must be taken to prevent top modules falling hazard. 1. The unit must be unpacked without any damage. 2. The floor on that the device will be placed must be flat and also the device must be positioned as parallel to the floor.
- Page 22 Think different, be different! 5. Modules must be assembled according to the specified letters on them. 6. The modules must be assembled by tightening the screw nuts of the connection equipment There are two methods for this process: internal connection and external connection. The necessary fasteners for both methods are supplied with the device.
- Page 23 Think different, be different! 7. For the internal connection, following fasteners that are supplied by ATC must be used. M12x30 Screw M12 Nut 5x30 Epdm Gasket External connection must be assembled with the following fasteners. M8x60 Screw M8 Nut 5x30 Epdm Gasket 8.
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Page 24: Fan Transportation Lock
Think different, be different! Cover sheets must be placed to overlap with the mounted roof sheets and roof trapezes must be insert through the pre-drilled holes. 3.2 Fan Transportation Lock The bases frames of fans and motors are made as rubber wedges or spring isolators according to demand. -
Page 25: Duct Connection
Think different, be different! 3.3 Duct Connection Dampers must not be screwed, otherwise it will cause damage to the gears and impairs the function of the damper. The Dampers/Brackets must not be exposed to bending, deflection or any kind of tensile. -
Page 26: Drain Connection
Think different, be different! Reductions used for contriction and widening in duct installations must be made with a maximum of 15 angle. Flexible connection is suggested to prevent sound transmission into the structure. This must be installed tension-free between the duct and the air handling unit. Duct connections on the device are specified with the labels below. - Page 27 Think different, be different! Connections must be easily removable to clean sediment from the drain pan and pipes. The drainage connection must be made as U-shaped and filled with water. H (mmSS): Height (Pa) / 10 The height H must be at least equal to 1x the maximum internal negative pressure of the unit. Example: Δp = 500 Pa ~= 50mm CE =>...
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Page 28: Coils
Think different, be different! 3.5 Coils The labels on the module specifies the inlet and outlet pipes of the coil. Fluid inlet connection must be made to the connection located far from the air inlet. Fluid outlet connection must be made to the connection which is near to air inlet. - Page 29 Think different, be different! The image below is an example of the correct pipe connections. As can be seen, the necessary spaces must be left for service and the pipelines must are supported. Pipes must be covered with insulating material to prevent condensation and heat loss. In order to control the water regime in the coils, 3-way or 2- way motorized valves must be used according to the need.
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Page 30: Run-Around Circuit Diagram
Think different, be different! 3.6 Run-Around Circuit Diagram In the air handling units with coil heat recovery system, the connection between the coils must be made in the construction site and in accordance with the diagram below. 1- Manual Valve 8- Manometer 2- Automatic Air Vent 9- Flowmeter... -
Page 31: Filter
Think different, be different! 3.7 Filter Filters are sent in the boxes with the device. When removing the filters from the boxes and assembling them, they must be held by their frames and must be done carefully. They must definitely be held by the media part of the filters and the media part must not be damaged. -
Page 32: Frame Filters
Think different, be different! 3.7.2 Frame Filters In filters with frames, gasket must not be applied between the filters. Gasket must be applied on the frame. 3x20 Epdm Gasket While placing to the filters with frame, the frame must be unclipped and placed in such a way that the filter is not damaged. -
Page 33: Plug And Play Socket
Think different, be different! No drilling and screwing should be applied to the dampers, otherwise the gears become damaged and lose their function. 3.9 Plug and Play Socket Since the air handling units are shipped as modular, plug and socket connections must be made on the worksite. -
Page 34: Change Over Sensor Installation
Think different, be different! 3.11 Change Over Sensor Installation In aqueous coils where heating and cooling functions are combined, the change-over sensor sent as disassembled. This sensor is placed in a box inside the panel. The sensor tracks the temperature of the water in the line and provides automatic mode switching of the system. -
Page 35: Disassembled Equipment
Think different, be different! 3.12 Disassembled Equipment When the design conditions of the device requires to exterior equipment, the materials that specified on the below, will be sent unmounted on the unit as disassembled. These equipment must be mounted on the air ducts or on the relevant sections on the working site. a) Temperature Sensors b) Humidity Sensors c) CO... -
Page 36: Electrical Connections
Electrical connections must be carried out by specialists. The connections should be in accordance with the electrical diagrams and the drawings in the user manual that provided by Air Trade Centre. Connections made not in accordance with the electrical diagrams will not be covered by the warranty. -
Page 37: Power Connection
Think different, be different! 4.1.1 Power Connection The electricity supply values required by the air handling unit must be made by referring to the electrical project of the relevant product. MAIN Panel Supply Input Terminal Block POWER IN 3x380V 50 Hz 25.2 kW Imax 42.5 A... -
Page 38: Fire Alarm System Connections
Think different, be different! For details of Modbus and Bacnet communication protocols. You can look the part of the control. Apart from communication protocols, the following information can be monitored or commanded through the BMS system via physical IOs. 32 33 Panel X4 Coded Signal Terminals System Status (30-31-32): Indicates that the device is switched on (Potantial free contact) General Alarm (33-34-35): Indicates any alarm on the device (Potantial free contact) -
Page 39: Dx Coil Connections
Think different, be different! Terminal number may vary in different models. Check from the panel wiring diagram. 4.1.4 Dx Coil Connections When our device has DX coil option, the following signals must be connected on the panel with experts in the field. Figure: Panel X4 Coded Signal Terminals on the Panel Fan status DX (03-04): Potantial free contact is an output signal. -
Page 40: Heating And Cooling Valve Actuator Connections
Think different, be different! 4.1.5 Heating and Cooling Valve Actuator Connections When our device has heating and cooling options, the valve motor is connected to the relevant terminals in the panel. Panel X4 Coded Signal Terminals on the Panel G: +24 V DC G0: 24 V DC Gnd Y: 0-10 V DC Valve Positioning Signal Terminal number may vary in different models. -
Page 41: Air Handling Units Without The Controlled System
Air Trade Centre also sends a wiring diagram in the fan control box together with the air handling unit. For detailed information, the data sheet of the fan model written in the technical printout can be examined. - Page 42 Think different, be different! RSA : RS-485 interface for MODBUS RSA RSB : RS-485 interface for MODBUS RSB GND : Reference ground for control interface Din1 : Digital input 1: Enable electronics Enable: Pin open or applied voltage 5...50 VDC; Disable: Bridge to GND or applied voltage <...
- Page 43 Think different, be different! RSA : RS-485 interface for MODBUS RSA RSB : RS-485 interface for MODBUS RSB GND : Reference ground for control interface 0-10V : Analog input 0-10 V +10V : +10V DC Output COM: Status relay, floating status contact, common connection NC : Status relay, floating status contact, break for failure RSA : RS-485 interface for MODBUS RSA RSB : RS-485 interface for MODBUS RSB...
- Page 44 Think different, be different! RSA : RS-485 interface for MODBUS RSA RSB : RS-485 interface for MODBUS RSB GND : Reference ground for control interface 0-10V : Analog input 1 (set value); 0-10 V +10 V : +10V DC Output COM: Status relay, floating status contact, option 1: break for failure NC : Status relay, floating status contact, option 1: make for failure RSA : RS-485 interface for MODBUS RSA...
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Page 45: Plug Fan Connections
Think different, be different! RSA : RS-485 interface for MODBUS RSA RSB : RS-485 interface for MODBUS RSB GND : Reference ground for control interface Din1 : Digital input 1: Enable electronics Enable: Pin open or applied voltage 5...50 VDC; Disable: Bridge to GND or applied voltage <... -
Page 46: Lighting Connections
Think different, be different! The connection structure is as follows; MOTOR Motor Supply Motor Thermistor U: L1 V: L2 W: L3 PE: GROUND +: Thermistor + -: Thermistor - 4.2.2 Lighting Connections 1x230 V supply line is drawn and connected to the terminals shown below. LIGHTING Lights L: 230V... -
Page 47: Damper Actuator Connection
Think different, be different! 4.2.4 Damper Actuator Connection Damper actuators can be supplying 230 V AC or 24 V AC/DC fed according to the project. According to the position style, it can be on/off controlled, 3 P controlled, proportional controlled. 4.2.4.1 Damper actuator connection with On/Off control It must be done according to the figure below. -
Page 48: Temperature Sensor Connection
Think different, be different! 4.2.5 Temperature Sensor Connection The temperature sensors that used in the unit are passive temperature sensors. Connection must be made as figure that shown at the right. 4.2.6 Temperature and Humidity sensor connection Temperature and humidity sensors that used in the unit are active sensors. -
Page 49: Differential Pressure Transmitter Connection
Think different, be different! 4.2.9 Differential Pressure Transmitter Connection Differential pressure transmitters are active sensors. The output signal can be configured as 0-10 V or 4-20 mA. Output is preset 0-10 V. Connection must be made as shown below. 4.2.10 Electric Heater Connections Electric heater configurations are usually preheater cascaded and post heaters are proportionally controlled. -
Page 50: Rotor Connection
Think different, be different! b) Step Step heaters can have 1 or more than 1 stage according to their heating power. The connection structure is as follows. STEP 1 STEP 2 Thermostat COM Heater first step Heater second step Thermostat R: L1 S: L2 T: L3... - Page 51 Think different, be different! COM-NO-NC is a fault signal output, it is a potantial free signal. If +12 V and 0-10 V terminals are bridged, the rotor will run at maximum speed. b) Euro Drive The drive operates with 1P 230 V. Driver current is maximum 0.5 Amps. GND - AI-1 is used to set the speed of the rotor.
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Page 52: Control
Think different, be different! 5. CONTROL 5.1 Display, Keys and Leds DISPLAY Vent controller 5.0 2017-01-08 14:29 System: Normal run Sp: 22.0 Act: 22.5 °C The display has 4 lines with 20 character positions each. The display is backlit. The backlight is off, but it can be activated when the user presses a key. -
Page 53: Access Rights
Think different, be different! 5.2 Access Rights There are four levels of access rights. Normal has the least access rights which do not require logging in. This is followed by Operator, Service and Admin levels. Admin level has the most rights. The choice of an access level determines which menus are displayed and also which settings you can change in those menus. -
Page 54: Sign Off
Think different, be different! digits of the code are displayed. Then press OK to confirm. Shortly afterwards, the new logon level will be displayed in the Current level line. Press LEFT ARROW to exit the menu. Factory preset passwords: Admin: 1111 Services: 2222 Operator: 3333 5.2.2 Sign Off... -
Page 55: Language
Think different, be different! 5.2.4 Language The menu can also be accessed directly by holding Choose language -> English down the OK key during startup or by pressing the RIGHT ARROW three times in the start menu. The language files are stored in the application memory and are copied to the working memory. If you have loaded a newer program version than the manufacturer's revision via Application tool©, you cannot download language files from the application memory. -
Page 56: System On/Off
Think different, be different! Fast blinking (2 times per second) means that the setting can be changed with the current access rights. Slower flashing (1 time per second) means that changing the setting requires higher access rights. To change a setting, press OK first. If higher access rights are required, a login menu appears. See below. -
Page 57: Change Temperature Setpoint
Think different, be different! 5.3.4 Change Temperature Setpoint a-Control Mode: Supply Air If the system runs in supply air control and you are at start display, press [▼]. ->Ventilation Vent controller 5.0 ->Actual/Setpoint Time settings 2017-01-08 14:29 Status Alarm events System: Normal run Inputs/Outputs Sp: 22.0 Act: 22.5 °C... -
Page 58: Change Fan Setpoint
Think different, be different! Act.Setp.= the actual setpoint temperature for return air. If you want to change supply air limits in return air control, following these steps: When you are at start display, press [▼] ->Ventilation Vent controller 5.0 ->Actual/Setpoint Time settings 2017-01-08 14:29 Status... - Page 59 Think different, be different! b-Fan Control Type: Constant Pressure If the system runs in constant air pressure control and you are at start display, press [▼]. ->Ventilation Vent controller 5.0 ->Actual/Setpoint Time settings Status 2017-01-08 14:29 Alarm events System: Normal run Inputs/Outputs Sp: 22.0 Act: 22.5 °C Temperature...
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Page 60: Input/Output Accesses
Think different, be different! 5.3.6 Input/Output Accesses Vent controller 5.0 Ventilation Raw values 2017-01-08 14:29 Time settings Analog inputs System: Normal run Digital inputs Alarm events Sp: 22.0 Act: 22.5 °C ->Inputs/Outputs Analog outputs These menus show the current values for all set inputs and outputs. These menus are only readable. - Page 61 Think different, be different! The bottom line is empty: It means alarm is still active 175 Sensor error CO2 room/extract air 8 May 14:31 Class:B Returned: It means alarm input is passive. But the system waits to reset alarm. Press two times OK button for reset or confirm the alarm.
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Page 62: Inspect Alarms
Think different, be different! 5.4.1 Inspect Alarms 1- Press the alarm buttons [ALARM] / [◄▲] to display the alarms. 2- If there is more than one alarm at the same time, this is indicated by up/down arrow symbols at the right-hand edge of the display. You can browse among them in two ways: a) By using the navigation buttons [▼] and [▲]. -
Page 63: Sing Up
Think different, be different! 1- Increasing and decreasing buttons of the temperature set value. 2- The active tempeture set value in the system. 3- The value of the system’s supply air. 4- Alarm button. 5- Outdoor/Fresh air’s value of tempeture. 6- Page navigation buttons. -
Page 64: Alarm Page
Think different, be different! 5.5.4 Alarm Page On the main page screen shown above, you can see the current alarms by pressing the alarm button. 5.6 Internal Web Interface When the Corrigo is connected to an external display or computer with a browser and a connection to the internet, an internal web interface will be shown. -
Page 65: Communication
Think different, be different! Start screen for the web interface: 5.7 Communication a-Modbus TCP/IP The MODBUS TCP/IP is activated by default. Default IP address is 192.168.3.100 255.255.255.0 It is possible to change the IP address. ->Communication Alarm events Vent controller 5.0 System Inputs/Outputs 2017-01-08 14:29... - Page 66 Think different, be different! b-Modbus RS485 The MODBUS RS 485 is activated by default. Default modbus settings: Address: 1 Baundrate: 9600 Format: 8N1 Port: Port 2 It is possible to change the settings. ->Communication Alarm events Vent controller 5.0 System Inputs/Outputs 2017-01-08 14:29 Save and restore...
- Page 67 Think different, be different! d-Coil Status Register (10XXX) Modbus Object Name Bacnet Type UOM Function Description address AlaAcknowAll 10000 Alarm Command to acknowledge all alarms e- Input Register (40XXX) Modbus Object Name Bacnet Type UOM Function Description address Analogue Outdoor temperature (Modbus Scale AI_OutDoorTemp 40290 °C...
- Page 68 Think different, be different! f- Holding Register (30XXX) Modbus Object Name Bacnet Type UOM Function Description address Running mode air unit 0=Off, 2=Auto (In Bacnet connection add (+1) to AirUnitAutoMode 30788 OFF/Auto present value) Setpoint room air temperature When supply air control is active. SupplySetpoint 30812 °C...
- Page 69 Think different, be different! g-Input Status Register (20XXX) Modbus Object Name Bacnet Type UOM Function Description address SumAlarm 20007 Alarm Status Sumalarm, is set if any alarm Malf_SAF1 20011 Alarm Points Malfunction SAF Malf_SAF2 20012 Alarm Points Malfunction SAF-2 Malf_EAF1 20016 Alarm Points Malfunction EAF...
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Page 70: Overview Of Menu Controller
Think different, be different! 5.8 Overview of Menu Controller www.airtradecentre.com V.2.2... -
Page 71: Maintenance
Think different, be different! 6. MAINTENANCE 6.1. General Information Maintenance and cleaning are a determining factor on the efficiency of the unit. The chemicals used for these operations should be compatible and should be used properly, otherwise damages that will not be cover by warranty may occur. During the maintenance process, safety is always our top priority. - Page 72 Think different, be different! PERIOD RANGE ACCORDING COMPONENT CONTROL SUBSTANCES ACTION MONTHLY ANNUAL MONTHS MONTHS FREQUENCY OF USE Cleanliness control of internaland external Detailed cleaning must be done with a damp cloth panels Damage and corrosion control Damaged and corrosive sections must be replaced CASING Checking internal module connections and Damaged seals must be replaced.
- Page 73 Think different, be different! PERIOD RANGE ACCORDING COMPONENT CONTROL SUBSTANCES ACTION MONTHLY ANNUAL MONTHS MONTHS FREQUENCY OF USE Must be cleaned as explained in the maintenance Cleanliness check instructions In case of possible damage and corrosion on the Damage and corrosion control lamellas and housing, the HRS must be replaced.
- Page 74 Think different, be different! PERIOD RANGE ACCORDING COMPONENT CONTROL SUBSTANCES ACTION MONTHLY ANNUAL MONTHS MONTHS FREQUENCY OF USE must be cleaned as explained in the maintenance Cleanliness check instructions In case of possible damage and corrosion on the Damage and corrosion control body, steam hose, drainage hose, the damaged component must be replaced with a new one.
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Page 75: Component Maintenance
Think different, be different! 6.3. Component Maintenance 6.3.1 Casing The casing of the air handling units must be checked periodically every 6 months. During the maintenance process, special attention must be paid to the coated and painted surfaces of our products. Cleaning solvents must not contain alcohol to be used on coated surfaces. For this reason, detailed cleaning must be done with a damp cloth. -
Page 76: Fan
Think different, be different! When the maximum pressure drop recommended by the manufacturer is reached, In case of excessive leakage, damage or corrosion, In case of smells, replacement filters can be ordered from the distribution network of the filter manufacturer. Only original parts guarantee optimal functioning. Regular maintenance of filters is vital. -
Page 77: Coils
Think different, be different! The shield grid (fan inlet and/or outlet, if applicable) must be checked for correct installation/damage (visual inspection). If any drainage is exists, it must be checked for function. The fan must be tested for abnormal noises with turning it by hand. 6.3.4 Coils If the coils are to be used at full capacity, their inner and outer surfaces must be kept clean. -
Page 78: Plated And Rotary Heat Recovery
Think different, be different! In direct expansion coils, there is a possibility of oil accumulation in the pipe. It must be checked and oil must be drained when necessary. 6.3.5 Plated and Rotary Heat Recovery Filters in front of the heat exchanger air inlets prevent the inflow of impurity and particles between the plates. -
Page 79: Humidifier
Think different, be different! 6.3.6 Humidifier Humidifiers must be maintained according to the humidifier company's user manual that comes with the humidifier. Any sediment in the drain pan and fasteners must be cleaned. Also, corrosion areas must be cleaned and repaired. 6.3.7 Electrical Heater Ensure that the electric heater has cooled down completely before performing any work on it. -
Page 80: Alarm Table
Think different, be different! 6.4 Alarm Table Alarm text Reset Description Effect on control THINGS TO DO Type Check the supply duct. If all dampers Malfunction supply Manual There is no air flow on supply fan-1. Stop the fan are open, check the pressure sensors, Serious air fan 1 their pipe and electrical connections. - Page 81 Think different, be different! Alarm text Reset Description Effect on control THINGS TO DO Type Check the DX alarm status DX alarm is activated by digital DX Fault Auto Signal only information connections from the Minor input. relevant terminal. Alarm from frequency converter SAF The frequency converter of supply fan Vent.
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Page 82: Trouble Shooting
Think different, be different! 6.5 Trouble Shooting Possible Causes Fault Solution The circuit breaker must be switched on There is a circuit breaker between the mains between the mains and the cable drawn to the and the cable drawn to the unit unit. - Page 83 Think different, be different! Fault Possible Causes Solution Air flow rate set value must be brought to Set Values Adjusted the air flow setpoint incorrectly design conditions Pressure loss in the duct installation is low Air flow setpoint or fan operating level should compared to the design conditions be reduced Pressure Loss...
- Page 84 Think different, be different! Possible Causes Fault Solution Clogged siphon The siphon must be removed and cleaned Clean the condensate pan and open the drain Blockage of the condensate pan drain pipe pipe Drainage System The drip trap must be installed correctly to Incorrect installation or damage to the drip catch condensate, if damaged it must be trap...
- Page 85 Think different, be different! Possible Causes Fault Solution Foreign object hitting the heat exchanger or The heat exchanger or coil must be replaced Damage coil with a new one Structural The sensor that protects the heat exchanger Damage to Freezing on the heat exchanger or coil and coil against freezing must be replaced HRS or Coil Freezing...
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