ROOFTOP - HEAT PUMP UNIT

Transcription

1 ROOFTOP - HEAT PUMP UNIT Operation Manual Applies to Model YNRA R410A WARNINGS This bookles includes operation and maintenance information. Before beginning any procedure, carefully review this information. Pay special attention to all checks which must be performed before fi rst start-up. Before starting up the unit for the fi rst time, verify that unit has been correctly installed. Therfore it is necessary to become familiar with the installation instructions. The manual should be kept in a safe place for future reference. In case of persisting problems, contact your Reznor distributor. Use only factory-authorized parts when replacement is required. Unauthorised modification of this appliance or departure from use in the manner for which it was intended by the manufacturer or installed in a manner contrary to these instructions, may constitute a hazard and jeopardize all warranties. Deviations should only be carried out after formal consent has been obtained from the manufacturer. CONTENTS 1. Technical features 1.1 Technical data...p 2 2. Description 2.1 Exploded view...p Composition...p Safety devices...p 4 3. Final checks & commissioning 3.1 Checklist...p Start-up...p 5 4. Comfort regulation 4.1 Main features...p Hardware installation...p User interface...p Description menus...p Functions...p Supervisor parameters...p Alarms...p Troubleshooting...p Maintenance...p Disposal...p 20 Company Standards and Services: All Reznor products are tested and approved to CE standards. Reznor Europe nv is assessed to EN ISO 9001: 2008 Quality Management. Reznor reserves the right to change specifications without prior notice. Reznor Europe N.V. J&M Sabbestraat 130/A000 B 8930 MENEN Tel. +32(0) reznor.europe@tnb.com Fax. +32(0) website: Operation manual YNRA/EN/1206- pag 1/20

2 1. TECHNICAL CHARACTERISTICS 1.1 Technical data YNRA 60 Cooling 1 Gross cooling capacity kw 58,19 Net cooling capacity kw 55,53 Absorbed power kw 18,45 EER 4 3,01 Heating 1 Absorbed power kw 14,54 Net heating capacity kw 52,11 Air treatment section Condensing section Refrigerant section Electrical COP 5 3,58 Nominal air fl ow m³/h Minimum air fl ow m³/h Maximum air fl ow m³/h Max. ext. static pressure 2 pa 250 Fans n 1 Fan type plug fan Nominal power input kw 2,53 Filters class G4 Air fl ow m³/h Fans n 2 Fan type axial Nominal power input kw 1,2 Compressors n 2 Type scroll Refrigerant circuits n 1 Power supply V/PH/Hz 400/3/50 Full load amps 1 A 53,24 Maximum starting current A 118 Maximum fuse size A 63 Sound level 1, 3 Outdoor dba 77 Indoor outlet dba 81 Construction Casing material precoated galvanised steel Dimensions mm 3065x2700x1913 Colour Ivory white Refrigerant R410A kg 16,5 Refrigerant oil POE l 2 x 3,30 Operating range Cooling Heating outdoor C DB 20~43 indoor C WB 15~24 outdoor C WB -10~15 indoor C DB 15~24 (1) Evaporator inlet air temperature 27 C d.b. / 19 C w.b.; Ambient air temperature 35 C; Condenser inlet air temperature 20 C; Ambient air temperature 7 C d.b./6 C w.b. (2) At nominal airflow rate. (3) Sound level measured according to ISO at 100 Pa (4) EER : Energy Efficiency Ratio (5) COP : Coefficient of Performance Operation manual YNRA/EN/1206- pag 2/20

3 2. DESCRIPTION 2.1 Exploded view Legend : A Main fan inverter N Accumulator B Main plug fan O Scroll compressor C Gas burner switch box P Digital scroll compressor D Gas intake Q Condenser E Exhaust fan R Power supply intake F Evaporator drain S Main switch G Evaporator T Axial condensor fan H Filterrack U Electronic expansion valve I Lifting lugs V Switch box J Forklift rail W Gas burner K Sight glass X Reversing valve L Filter/drier M Condenser drain Operation manual YNRA/EN/1206- pag 3/20

4 2.2 Composition Compressor : The compressor works as a pump to control the circulation of the refrigerant in the refrigeration circuit and compresses the refrigerant leaving the evaporator at the pressure at which it can be condensed to liquid in the condenser. Condenser : A condenser is a device or unit used to condense a substance from its gaseous to its liquid state, typically by cooling it. The heat gained by the gas in the evaporator is discharged through the condenser to the ambient air and the vapour condenses to liquid. Filter/drier : The fi lter is installed behind the condenser. It is used to fi lter out small particles from the refrigerant to avoid blockage of the tubes. The drier is removing moisture to prevent it from circulating through the system. Expansion valve : The expansion valve is installed at the inlet of the evaporator and allows the liquid refrigerant coming from the condenser to enter the evaporator. The expansion valve lowers the pressure of the liquid refrigerant to a level at which it becomes refrigerant vapor as it moves to the evaporator. Evaporator : The evaporator absorbs the heat from the water that circulates through it by transforming the liquid refrigerant coming from the condenser into gaseous refrigerant. Piping diagram 2.3 Safety devices To ensure safe operation of the Rooftop unit, there are 2 kinds of safety devices applied: The overall safety devices : these devices cut off all circuits and stop the complete installation. In this case, the resetting of the unit must be done manually. The Safety devices related to specifi c parts : these devices shut down only the component they protect. The Rooftop unit is equipped with following safety devices : Discharge thermal protector : All units are equipped with a discharge thermal protector. This safety device operates when the temperature of the refrigerant leaving from the compressor becomes too high. It resets automatically after temperature returns to normal. The controller requires a manual reset. Overcurrent relay : The overcurrent relay operates in case of overload, phase failure or too low voltage protecting so the compressor motor. These relays, built into the switch board of the unit, are factory set and non-adjustable.when activated, reset requires manual intervention, followed by a reset of the controller. Compressor thermal protector : The compressor motor is protected from overheating by thermal protectors. They reset automatically after compressor cools down. The controller requires manual resetting. Fan motor thermal protector : The condenser fan motors are protected from overheating by thermal protectors. They reset automatically after temperature returns to normal. Low pressure cutoff : The low pressure cutoff control is located in the suction line as it enters the compressor. If the suction pressure drops below the low pressure cutoff setting, the control will stop compressor and condenser fan operation. The low pressure cutoff control can be reset on the controller when suction pressure goes to normal conditions. High pressure cutoff : The high pressure cutoff control is located in the discharge line as it exits the compressor. If the discharge pressure exceeds the high pressure cutoff setting, the control will stop compressor and condenser fan operation. These controls are factory set and non-adjustable. When activated, reset requires manual intervention. Hereafter the controller still needs to be reset. Reverse phase protector : The scroll compressors are protected from running in the wrong direction by the reverse phase protector. If the controller refuses to start because of incorrect phase order, invert 2 phase of the power supply to remedy the problem. Operation manual YNRA/EN/1206- pag 4/20

5 3. FINAL CHECKS & COMMISSIONING WARNING To prevent injury or death due to electrocution or contact with moving parts, lock main circuit breaker in off position when doing checks prior to startup. Only suitably trained personnel or qualifi ed persons should be used to carry out the commissioning. Ensure that all relevant manuals are available before proceeding! It is necessary to perform following checks prior to startup the system. 3.1 Checklist prior to start-up Check that all wiring is connected in accordance to the appliance circuit diagram and the installation instructions. Be sure all field-installed controls are in place. All fi eld wiring must comply with all local and national regulations. Check the wiring for loose connections or damaged wire. Check that fuses or circuit breakers are in place and sized correctly (see unit rating plate). Bypassing fuses or circuit breakers is strictly forbidden. Check voltage supply. See voltage use range on the rating plate. Readings must fall within the allowable range. Be certain that the unit is correctly earthed by conducting an earth continuity test. Check to ensure that unit is securely fastened and correctly fi xed. Ensure that the rooftop is installed in a level plain. Check that unit and all components are free of damage. Check unit for refrigerant and oil leaks. Contact your distributor in case of leaks. Verify that air inlet and air outlet is not restricted. 3.2 Start-up WARNING At the initial start-up or after long periods of standstill without power, crankcase heaters must be allowed to warm up for at least 8 hours prior to start-up. Not observing this rule can cause damage to the compressors. Procedure to follow when connecting the crankcase heater : Before beginning the installation, switch on circuit breaker and ensure that the unit is off. After being energized, the crankcase heater begins to run automatically. Check supply voltage on the terminals L1,L2 & L3 by using a voltmeter. Readings must fall within the allowable range indicated on the rating plate of the unit. If values deviate from the specified data, check wiring and replace supply wires if necessary, Ensure that phase order is correct : the lighting of the LED on the reverse phase protectors shows a correct working. If not, switch off circuit breaker and ask intervention of qualifi ed electrician. Make sure that crankcase heaters are warming up. After 8 hours, unit is ready for functioning. Attention : Before starting up the unit, make sure that all external panels are in place and properly fi xed. When leaving unit unattended, ensure that hinges of the control panel are locked by tool. Service panels may only be opened by qualifi ed persons for performing maintenance work. The power supply must not be switched off during winter. Doing so could harm the LCD displays of the digital controller. Operation manual YNRA/EN/1206- pag 5/20

6 4. COMFORT REGULATION for Reznor Rooftop units 4.1 Main features The Reznor comfort regulation is the digital integrated solution for Reznor Rooftop units. This regulation features: - Standard control of Rooftop units - Control of gas heating (one stage, two stages or modulating) - Control of (speed controlled) air supply - Control of air mixing dampers - Room and duct temperature control - Free cooling / free heating - Setpoint compensation - plan network between controllers - Connection to BMS systems as slave (Modbus, Carel, Bacnet, Lon) - Easy confi guration through graphic display - No extra switches or relays necessary 4.2 Hardware and installation Controller specifications 1 power supply connector (G(+), G0(-) 2 plan address button, 7 segment display & LED (power on & overload,+vdc terminal) 3 additional power supply for terminal and 0 to 5V ratiometric probles 4 universal analogue inputs, NTC, 0 to 1V, 0 to 5V ratiometric, 0 to 10V, 0 to 20mA, 4 to 20mA 5 passive analogue inputs, NTC, PT1000, ON/OFF 6 0 to 10V analogue outputs 7 24 Vac or 28 to 36 Vdc digital inputs Vac or 24 Vac or 28 to 36 Vdc digital inputs 9 display terminal connector (external panel with direct signals) 10 connector for all standard pco series terminals & for downloading appliacation program 11 relay digital outputs 12 fi eldbus 2 connector 13 plan network connector 14 cover for inserting supervisor serial card option (BMS1) 15 cover for inserting fi eld card option (fi eldbus 1) 16 bms2 connector 17 fi eldbus2 connector 18 built-in terminal (LCD, buttons & LEDs) 19 USB host and slave cnnector 20 electronic valve connector 21 valve driver analogue & digital inputs 22 valve driver power supply from Ultracap module EV- D0000UC20 (external to pco 5) Operation manual YNRA/EN/1206- pag 6/20

7 Probe installation The passive temperature probes (room, duct and outside temperature) consist of a simple NTC sensor. The two NTC probe wires are equivalent (as there is no polarity), therefore no special order needs to be followed when connecting to the terminal block. The CO2-sensor is an active probe with a 0-10V DC output. The sensor is connected with 3 wires (UB, GND, Output). It is important that the output jumper is placed on Voltage (V) for 0-10V output. All probes can be installed with the following types of cables: - Up to 20m: LIYCY 0,34mm² - Up to 50m: LIYCY 0,5mm² One pair is required for the passive probes and two pairs for the active probes (CO2-sensor) WARNING Separate as much as possible the probe signal cables from the cables carrying inductive loads and power cables to avoid possible electromagnetic disturbance. All connections to be made are specifi ed on the electrical diagram supplied with the unit. Graphic display and plan network installation The graphic display is connected via the proprietary plan protocol directly to the pco controller with a RJ12 (6-wires) telephone connector. This connection includes the power supply for the display. The plan connection between multiple Reznor rooftop units is made with a three wire connection. It is important that the shield of the cable is always connected to the GND pin. The following cable types may be used: - Up to 20m: LIYCY 0,34mm² - Up to 200m: LIYCY 0,5mm² One pair is required for the plan network connection between units (without power supply) and three pairs are required for the connection of the graphic display. WARNING Separate as much as possible the plan network cables from the cables carrying inductive loads and power cables to avoid possible electromagnetic disturbance. Operation manual YNRA/EN/1206- pag 7/20

8 BMS installation When an option for the connection to building management systems is ordered, an add-on card will be installed in the controller (serial card 1). The wiring depends on the type of add-on card that was ordered. The documentation for these add-on cards is delivered separately. It is recommended to use LIYCY 0,5mm² cable to connect the units to the building management systems. For the pcoweb add-on card a UTP CAT-5/6 ethernet cable with RJ11 connector can be used. 4.3 User interface Graphic terminal The user interface for the Reznor comfort regulation is the pgd1 graphic terminal (wall or panel mounted), or alternatively the built-in terminal directly on the pco controller (optional). This interface is used to control one or more Reznor units with comfort regulation. This terminal, illustrated in the fi gure above, features 6 buttons, with the following meanings: Alarm : Display the list of active alarms Prg : Enter the main menu tree Esc: Return to the previous screen. Up: Scroll a list upwards or increase the value shown on the display. Down: Scroll a list downwards or decrease the value shown on the display. Enter: Enter the selected submenu or confi rm the set value. Main screen The main screen shows information on the current ambient conditions and unit status. 1. Time, date and connected unit (in plan network) 2. Current room temperature 3. Main functions that are active (in this case gas heating and main fan) 4. Unit status (only displayed if unit is not on) 5. Current summer/winter status 6. Current room temperature setpoint Operation manual YNRA/EN/1206- pag 8/20

9 Main menu The main menu can be accessed from the main screen by pressing the Prg key. An item from the menu can be selected by using the Up and Down keys. The selected menu item can then be accessed by pressing the Enter key. The main menu consists of 8 menu items. The Service and Manufacturer item also feature a number of submenus for easy confi guration of the unit. All underlined menus require a password for access. The service password (PW1) to access the secured service settings is only meant for qualifi ed persons to introduce the correct settings during installation. The manufacturer menus are secured by the manufacturer password (PW2) and are only available for Reznor. Main menu tree: - A. On/Off Unit - B. Setpoint - C. Clock/Scheduler - D. Input/Output - E. History - F. Board switch - G. Service a. Change Language b. Information c. Summer/Winter d. Working hours e. BMS confi g. f. Service settings (PW 1) - Working hour set - Probe adjustment - Thermoregulation -User DEV/Change PW1 g. Manual management - H. Manufacturer (PW 2) Parameter screens The parameter setting screens always shows the name of the menu, the current screen number and the description of the parameters that can be changed. In the top right corner the screen number (Gfc03 in this case) is shown. The parameters can be changed by pressing Enter to move the cursor to a settable parameter and by using the arrow keys to change the parameter. Pressing Enter again will confi rm the change. Operation manual YNRA/EN/1206- pag 9/20

10 4.4 Description of menus A/ Unit on/off - Summer/Winter mode The following screen displays the current unit that is controlled (plan address) and the current state it is in. On the last line of the screen the current state of the unit can be changed. However, if an alarm is present, or the unit is shut off externally (BMS or digital input), it will not be possible to switch on the unit. A02 Summer/winter screen gives the possibility to change the winter mode into summer mode manually or automatically. B/ Setpoint If the temperature setpoints are controlled locally, these can be changed on these screens. The winter setpoints are used for (free) heating and the summer setpoints are used for (free) cooling. It must be noticed that (for example) when (non free) cooling is disabled during the night, that the summer setpoint during the night is used only for free cooling. If temperature setpoints are controlled externally (through a BMS or plan master unit), these screens will only display the current setpoints. In this case these screens will be read-only. C/ Clock/scheduler In these screens it is possible to change the current date and time, to activate the overwork timer and to program the day scheduler. In the fi rst screen C01 the current date and time can be changed. The overwork timer C02 overrides the current schedule for a specifi ed time. During this time the day-schedule is used. This screen can also be accessed directly from the main screen by pressing Prg + Enter simultaneously. Operation manual YNRA/EN/1206- pag 10/20

11 The day scheduler C03 makes it possible to program up to 4 different time zones for each day of the week. For each zone it is possible to choose between OFF, DAY, NIGHT. OFF means that the entire unit is off, DAY means the day -setpoint is used and NIGHT means that the night -setpoint is used. It is possible to copy the schedule of each day to another day (for faster programming). This is done by moving the cursor to the Copy to: fi eld, then using the arrow keys to select the desired day (or ALL days), pressing Enter to move the cursor to NO, then changing this to YES with the arrow keys and confi rming with Enter. The next screen C04 allows to program up to 3 holiday periods. This holiday program takes priority over the daily scheduler. The last screen C05 allows to program up to 6 special days. Special day programming takes priority over holiday period and daily scheduler. D/ Input/output In this menu it is possible to display the physical status of the inputs and outputs, both digital and analog. It is also possible to view the status of possible devices that are connected through Modbus (such as a frequency converter). All data can be viewed in sequence (scroll with arrow keys). The values corresponding the analog outputs are expressed as a percentage. E/ History In this menu the logged alarms can be viewed in sequence. The alarms are displayed with the alarm code (see paragraph 8 Alarms), together with their corresponding date and time of occurrence. The Alarm button is only used to view the current alarms and to mute the buzzer (if present). See 8.2 for more information. F/ Board switch This screen can be used to view the status of the plan network (between controllers and terminals). It is also possible to change the unit that this terminal is controlling (if it is a shared terminal). This functionality makes it possible to control multiple units with a single graphic terminal. G/ Service The service menu contains information about the unit and installer access for advanced settings. These advanced settings (Ge, Gf, and Gg) require a service password (PW1 - default 7396). Ga. Change Language: Select one of the languages loaded in the application. Operation manual YNRA/EN/1206- pag 11/20

12 Gb. Information: View information relating to the application code (and corresponding version) on the first screen, while the second shows information concerning the pco controller hardware. Gc. Summer/Winter: Displays the current summer/winter status of the unit as well as a possibility to change the current status (depending on changeover mode). If the changeover mode is set on manual, the status can be changed directly. If the unit uses automatic changeover, the changeover temperatures can be changed here. If the room temperature drops below the winter changeover setpoint, the unit is put into winter mode. If the room temperature rises above the summer changeover setpoint, the unit is put into summer mode. It is recommended to put the Winter changeover setpoint to a value close to the Winter night temperature setpoint and to put the Summer changeover setpoint to a value a little higher than the Summer day setpoint. Gd. Working hours: Displays the operating hours for the entire unit and the main devices that need periodical maintenance. Note: From this point on in the submenu, access requires a password (installer password PW1 default 7396). Ge. BMS Config: This screen is used to confi gure the supervisor (building management system). This functionality requires an additional add-on card. The protocol that is selected here is actually the protocol to communicate to the add-on card. The actual translation is done by the add-on card. All add-on cards can be used with the RS485 protocol (for example the Bacnet card translates the RS485 protocol to Bacnet). To communicate directly to the unit via Modbus (Reznor unit as slave), it is necessary to use the Modbus RS485 protocol and the RS485 supervisor add-on card (OP1002 B 11). Gf. Service settings: This submenu is used by the installer for the following purposes: - Gfa. Working hour set: Reset working hours after maintenance and specify when a maintenance alarm should be generated - Gfb. Probe adjustment: Used to set an offset to be added to or subtracted from the reading made by the probe in question. Once the offset (Adj) value has been confi rmed, pressing Enter automatically updates the reading of the corresponding probe. - Gfc. Thermoregulation: These screens are used to change the advanced parameters of the unit regulation. Here it is possible to change temperature differentials, minimum and maximum openings for air dampers, setpoint compensation, duct temperature limits, If a clear description of the unit has been delivered together with the order, all these parameters will be pre-adjusted in the factory. The installer then just has to verify the parameters and change them slightly if the installation requires. - Gfd. User DEV/ Change PW1: On these screens it is possible to return to the previously saved standard parameters (saved before leaving the factory) and to change the installer password PW1 (default 7396). Gg. Manual management: Used to switch the individual actuators on the unit from automatic to manual. H/ Manufacturer This menu is used by the manufacturer (manufacturer password PW2 is required). The manufacturer can use this menu to change the confi guration of the unit. Operation manual YNRA/EN/1206- pag 12/20

13 4.5 Functions Scheduler and setpoints Scheduler The scheduler features the ability to program 4 time zones for each day of the week. Additionally, it is possible to program holiday periods and special days. For each zone there are 4 possibilities: Off, Day, Night, When the unit is off, there is no heating or cooling, fans are off and dampers are closed. However, if frost protection is enabled, this will also work when the unit is off. In this case the gas heaters fire up, the dampers stay closed and the fans start running. - In day or night mode, those respective setpoints are used, and depending on the settings the unit is running. - When --- is displayed, the setting of the previous time zone is taken over. The scheduler also features an overwork timer. It is possible to specify a certain amount of time, and during this time, the scheduler is overruled by the Day setpoints. Schedule optimization (experimental) is a feature to make sure that the room temperature is at the setpoint as soon as the Day-setpoint would be activated. During the last 5 days, the time it takes to reach the setpoint is saved. Depending on the current room temperature the time it will take to reach the setpoint will be predicted. This time is then used to change the schedule earlier, so the room setpoint will be achieved earlier. Setpoints It is possible to have different temperature setpoints for both day and night, as well as during the summer and during the winter. Cooling can be disabled during the night (only free cooling). Minimum and maximum air damper openings can be adjusted depending on day or night schedule. Setpoint compensation When an outside temperature probe is connected, the current setpoint is adjusted according to the outside temperature. This is to maximize comfort and to minimize energy consumption. All these parameters can be adjusted in the Service menu. In winter mode, when it gets hotter outside, the temperature setpoint will drop. In summer mode, when it gets hotter outside, the setpoint will rise. Operation manual YNRA/EN/1206- pag 13/20

14 Main fans It is possible to control the supply fans with this comfort regulation. Either the fan always runs when the unit is on, or the fan only runs when there is a demand. A demand can be a heating demand, cooling demand or damper opening demand. On and off delays are settable to have a comfortable regulation. It is also possible to use frequency inverter. In this case the speed of the supply fan can be controlled. The communication between the comfort regulation and the frequency inverter is done through the internal control. All wiring and parameterization is done by the manufacturer. If speed controlled fans are used there are several possibilities to control the speed of the fan. - Fixed AF - Constant temperature rise: predicts temperature rise and compensates with duct temperature measurement (only on heating) It is also possible to lower the speed when there is no demand (if the fan is constantly running). These control possibilities need to be mentioned together with the order as this functionality can only be introduced by the manufacturer to ensure safe operation of the unit. Heat pump control The changeover between summer and winter mode can be done manually, automatically or by a plan master. Both heating and cooling is regulated proportionally (or proportion + integral) depending on room temperature, current setpoints and regulation differentials. In winter mode, when a gas heater is installed, the regulation automatically chooses whether the heat pump or the gas heater should be used. This can be managed in two ways: By outside temperature: When the outside temperature drops below the changeover setpoint (adjustable by installer), the heat pump will be disabled and the gas heater will be used. By energy cost: When gas and electricity prices are known, the current cost of gas heating or heat pump heating is calculated (depending on heater effi ciency and heat pump COP in function of outside temperature). Additionally to this changeover regulation there is a protection based on the duct temperature measurement. A minimal temperature rise (duct temperature room temperature) may be used. If this temperature rise is not reached, the gas heater will start running for 10 minutes. Operation manual YNRA/EN/1206- pag 14/20

15 Air mixing, free cooling, free heating and air quality (Optional) The regulation can control a modulating servomotor to open/close an air damper. This air damper is used to mix return air with fresh air and is controlled with an analog output of the regulation (2-10V or 5V PWM). It is possible to specify a minimum and maximum opening percentage for the air damper during the day and during the night. Thus it is possible to have a minimum (adjustable) amount of ventilation during the day, and to have only heating during the night. The maximum opening can also be adjusted to limit the overpressure in the building in case that there is no return blower. Between this minimum and maximum opening of the air damper, other types of regulation are possible. Free cooling: In case the air outside is cooler than the air inside and the room temperature is above the current setpoint, the fresh air damper opens gradually. Free heating: In case the air outside is warmer than the air inside and the room temperature is colder than the day setpoint for heating, the fresh air damper opens gradually Air quality control: In case a CO2-sensor is installed, the damper will open gradually to keep the room CO2 level below the specifi ed setpoint. The use of these 3 regulations can reduce the operating costs significantly, as only ventilation is used when it is necessary. 4.6 Supervisor parameters Analog values BMS address Description Default UOM Min Max Read/write Variabele name 21 Probe B Probe B Probe B Probe B R AIN_ R AIN_ R AIN_ R AIN_4 4.7 Alarms Alarm management The regulation can manage all alarms mentioned below. Depending on the type of alarm the unit may be stopped completely or partially. For example, if there is a fault on the main compressor, an alarm will be displayed and the second compressor will take over. If an alarm is present the Alarm key will be fl ashing red. Pressing this key will display the current active alarms and pressing the key again will reset the active alarms. Of course, it is also necessary to fi nd the cause of the alarm, to be able to reset it. This screen displays the alarm code in the upper right corner as well as a brief description of the alarm. If an external reset is possible, this can be done by pressing Enter. In this example, pressing Enter will reset the burner relay. Operation manual YNRA/EN/1206- pag 15/20

16 Alarm log From the main menu, entering the History menu or at the end of the list of alarms described above, the following alarm log screen can be accessed. A maximum of 50 alarms can be logged; over this limit new events overwrite the older ones, which are deleted. Table of alarms Alarm code Description Alarm code Description ALA01 Unconnected probe B1 ALT01 Maintenance unit ALA02 Unconnected probe B2 ALT02 Maintenance main fan ALA03 Unconnected probe B3 ALT03 Maintenance return fan ALA04 Unconnected probe B4 ALT04 Maintenance gas heating ALA05 Unconnected probe B5 ALT05 Maintenance compressor 1 ALA06 Unconnected probe B6 ALT06 Maintenance compressor 2 ALA07 Unconnected probe B7 ALC01 Thermal compressor 1 ALA08 Unconnected probe B8 ALC02 Thermal compressor 2 ALA09 Unconnected probe B9 ALV01 VDF serious fault ALA10 Unconnected probe B10 ALV02 VDF offline ALF01 Fan thermal overload ALV03 VFD fault ALF02 Flow switch ALV04 VFD fault ALF03 Thermal condenser fan 1 ALV05 VFD fault ALFO4 Thermal condenser fan 2 ALV06 VFD fault ALG01 Clock fault ALV07 VFD fault ALG02 Extended memory fault ALV08 VFD fault ALR01 Gas heating fault ALV09 VFD serous fault ALR02 Cooling fault ALV10 VFD not serious fault ALR03 Dirty fi lter ALV11 VFD offline ALR04 Dirty fi lter return ALV12 VFD fault ALS01 Serial humidity probe ALV13 VFD fault ALS02 Serial probe offl ine ALV14 VFD fault ALS03 Serial temperature probe ALV15 VFD fault ALS04 Serial humidity probe ALV16 VFD fault ALS05 Serial probe offl ine ALW01 High duct temperature ALS06 Serial temperature probe ALW02 Low duct temperature ALS07 Serial humidity probe ALW03 High outside temperature ALS08 Serial probe offl ine ALW04 Low outside temperature ALS09 Serial temperature probe ALW07 High room temperature ALS10 Serial humidity probe ALW08 Low room temperature ALS11 Serial probe offl ine ALW09 High room humidity ALS12 Serial temperature probe ALW10 Low room humidity ALS13 Serial humidity probe ALW11 High CO2/VOC ALS14 Serial probe offl ine ALP01 Low pressure switch ALS15 Serial temperature probe ALP02 High pressure switch ALS16 Serial humidity probe ALS17 Serial probe offl ine ALS18 Serial temperature probe ALS19 Serial humidity probe ALS20 Serial probe offl ine ALS21 Serial temperature probe Operation manual YNRA/EN/1206- pag 16/20

17 5. TROUBLESHOOTING The troubleshooting section will help you to determine the problem and to correct certain troubles. Prior to calling a service technician, there are some basic troubleshooting steps you can perform. If it is not possible to solve the problem, contact your distributor. WARNINGS Before starting the trouble shooting procedure, turn off all power to the unit. Before starting inspection, verify that all connections are properly fi tted and check condition of wiring. Before resetting safety devices, it is necessary to remedy the cause of the problem. It is forbidden to change the factory settings of the safety devices. Safety switches must not be bypassed (bridging of contacts), turned away or removed. Important : Do not release refrigerant to the atmosphere. If required service procedures include the adding or removing of refrigerant - the service technician must comply with all national, state, province and local laws. PROBLEM POSSIBLE CAUSE REMEDY A/ Compressor will not start Power off, loose electrical connections or fuse open Check disconnect switch, fuses, and wiring. Replace parts or repair as necessary. Compressor contactor not closing. Check voltage to contactor coil, transformer, slave relay, and system. Replace parts as necessary Internal compressor thermal overload open. If compressor is hot, allow 2 hours to cool. See D. below. Compressor defective. Check compressor for electrical failure. Compressor may be seized; check refrigerant. If necessary, replace compressor. High or low pressure switch open or defective. If manual reset (high pressure), reset switch. (Switch opens at 40,2bar and will not reset above 32 bar.) If auto reset (low pressure) does not reset and everything else is OK, replace switch. B/ Compressor starts but cuts out on low pressure (low pressure switch activates at 1.5 bar.) Low refrigerant charge. Airfl ow restricted Restriction in refrigerant line Defective low pressure switch Check subcooling and superheat. Check for dirty evaporator coil, dirty fi lters, closed dampers or iced evaporator coil. Check motor amps. Check duct design. Check refrigerant pressure; check expansion valve. If not functioning properly, check for pressure drop across the fi lter drier. Check calibration of switch. C/ Compressor starts but cuts out on high pressure Refrigerant overcharge Check subcooling and superheat. switch. Condenser fan motor defective Check fan motor(s). Air or non condensables in system Check high side equalized pressure reading with equivalent outdoor temperature. Defective high pressure switch Check calibration of switch. Restriction in discharge or liquid line Check refrigerant line pressures, check expansion valve. D/ Compressor cuts out on thermal overload. Low voltage Check voltage Substained high discharge pressure Check running amperage and conditions described in H. High suction and discharge pressures Check expansion valve. Check for non-condensables in the system. Defective compressor overload If compressor is hot, allow compressor to cool for two hours. Recheck for open circuit. Compressor operating in reverse Switch the 3 phase line voltage wiring connections. Improper refrigerant charge Check subcooling and superheat. Bearings or pistons too hot Check for low oil level. Allow time for compressor to cool Check dome temperature of compressor Operation manual YNRA/EN/1206- pag 17/20

18 PROBLEM POSSIBLE CAUSE REMEDY E/ Noisy compressor Refrigerant overcharge Check subcooling and superheat. Compressor operating in reverse Switch the 3 phase line voltage wiring connections. Liquid fl oodback Check expansion valve. Check for refrigerant overcharge. Check subcooling and superheat Tubing rattle Dampen tubing vibration by taping or clamping. Carefully bend tubing away from contact where possible. Compressor defective Check internal parts. Replace parts or compressor as needed. F/ High suction pressure Excessive load on evaporator coil Check for high entering wet bulb temperature. Check for excessive air. Compressor is unloaded Check head pressure; check thermal expansion valve if not functioning properly; check pressure drop across fi lter drier. Expansion valve not secured to suction line or valve defective Check operation of the expansion valve. Ensure sensors are well connected. G/ High discharge pressure Expansion valve setting Check expansion valve and superheat. Refrigerant charge Check subcooling and superheat. Condenser fan motor defective Check operation of condenser fan motor(s) Non condensables in the system Clean circuit H/ Suction pressure too low Refrigerant undercharge Check superheat and subcooling. Check for a leak. Blower running backward Interchange any two wires of 3 phase wiring connections. Loose blower Check air handler drive pulley alignment and belt tension. Defective or improperly adjusted expansion valve Check superheat and thermal expansion valve. Dirty fi lter Check fi lter and evaporator coil. Clean or replace as needed. Too little air fl ow or low entering air temperature Check airfl ow and entering air wet bulb conditions. Restriction in suction or liquid line Check refrigerant circuit for restriction. I/ Head pressure too low Insuffi cient refrigerant charge Check superheat and subcooling. Check for a leak. Defective or improperly adjusted expansion valve Check superheat and expansion valve. Low suction pressure See H above. Defective compressor See F above. J/ Compressor short cycles Thermostat location or malfunction Check thermostat/control Improper refrigerant charge Check subcooling and superheat Defective high or low pressure control Check and replace as needed. Liquid fl oodback Possible tight bearings. Defective expansion valve Check expansion valve and superheat. Poor air distribution Check ductwork for recirculating. High discharge pressure See G above. Leaking discharge valves in compressor See F above. K/ Running cycle is too long or unit operates continuously Refrigeration undercharged Check subcooling. Dirty fi lter or evaporator coil Check fi lter, coil and airfl ow. Dirty or clogged condenser coil Check coil and airfl ow. Air or other non condensables in system Check equalized high side pressure with equivalent outdoor temperature. Defective compressor See F above. Restriction in suction and liquid line Check for restrictions in refrigerant circuit. Control contacts stuck Check wiring. L/ Supply air temperature is too high Refrigerant undercharge or leak in system Check subcooling and check for leaks. Evaporator plugged with dirt or ice Check evaporator, airfl ow and fi lter. Improperly adjusted or defective expansion valve Check superheat and expansion valve. Check expansion valve sensors. Defective compressor Check compressor for proper operation. High discharge pressure See G above. Airfl ow too high Check external static pressure. Operation manual YNRA/EN/1206- pag 18/20

19 PROBLEM POSSIBLE CAUSE REMEDY M/ Supply air temperature is too low Airfl ow too low Check evaporator coil; check fi lters; check for closed dampers or grills; check drive for loose parts, belts, or misalignment; check external static pressure. Return air temperature too low. Check entering air wet bulb conditions. N/ Liquid is too hot Refrigerant undercharge Check subcooling Dirty/plugged condensor coil Clean coil Non condensables in the circuit Clean circuit Condensor fan motor defective Check condenser fan mtor (s) High discharge pressure See G above O/ The unit does not start but ON led lights up Incorrect temperature setting Check setpoint controller Unit is in manual mode Check on controller No power supply Check voltage Blown fuse or interrupted protection device Verifi y safety devices and fuses. Only use fuses of the same type and size Loose connections Check connections and tighten if necessary Faulty wires Check and repair if necessary P/ The unit does not start but ON led is blinking Remote switch if off and remote on/off input is enabled Check and adjust if necessary Q/ Unit stops after operation Clock is activated in off mode Disable clock or work conform settings A safety device is activated Check - detect cause and remedy Voltage is too low Check voltage R/ Unit is noisy and/or vibrates Improper fi xing of unit Fix unit properly in accordance with the instructions in the installation manual S/ One of following safety devices is activated Low pressure switch Shortage of refrigerant Checks for leaks in system and top up if needed Unit is working out of its operation conditions Check operation conditions Reverse phase protector is energized Faulty connection of power supply Switch 2 phase of power supply (intervention to be done by a qualifi ed technician) Improper connection of one phase Repair (protector will be reset automatically) Discharge thermal protector is energized Improper operation conditions Check (when temperature decreases, the thermal protector will reset automatically but controller needs manual reset) Compressor thermal protector is activated Temperature compressor motor coil too high Unsuffi cient cooling of compressor by refrigerant (when temperature decreases, the thermal protector will reset automatically). If problem occurs frequently, contact your distributor. Overcurrent relay of compressor is activated Faulty phases Check and repair Voltage insuffi cient Adjust Overload of motor Reset by pushing blue button on the overcurrent relay inside switch box and reset the controller. Contact distributor in case problem persists. High pressure switch Improper functioning of condenser fan Check free turning of fans. Clean if necessary Dirty or blocked condenser Remove obstacles or clean Inlet air temperature at condensor too high Check (temperature at condenser inlet must not exceed 43 C) Faulty turning direction of fan Switch 2 phases of power supply to fan motor (must be done by qualifi ed technician). Fan thermal protector is activated Fan is obstructed Check and repair Air fl ow too low or outside temperatur too hight Clean air heat exchanger (when temperature decreases, the thermal protector will reset automatically). If problem persists, replace motor or contact your distributor. Operation manual YNRA/EN/1206- pag 19/20

20 6. MAINTENANCE The unit should be controlled periodically to make sure it works correctly. If the unit is used as an air conditioning appliance, the checks should be made at least once a year - for other applications, checks should be done on a four-monthly basis. WARNINGS Before carrying out any work on the unit or accessing internal parts, make sure the unit is disconnected from the mains power supply. Also the hinges on the control panel should be placed in the locked position. After maintenance operations have been completed, the unit should always be closed with the relative panels which should be fi xed with the relative screws. Never clean the unit with water under pressure Please remember that wiring and power supply must be checked by a qualifi ed technician. Inspect the wiring for any damaged wires. Replace damaged wiring. NOTE: If replacement parts are required, use only factory-authorized parts. For information, call your supplier. Maintenance checks Air heat exchanger : Carefully clean coil fins by means of a brush and a blower. Blow from the inside of the unit. Pay special attention not to damage or bend the fi ns. Wiring and power supply Check that voltage corresponds to the voltage mentioned on the data label of the unit. Check that all connections are properly fi xed. Check correct working of earth leak detector and circuit breaker. Make sure the terminals in the electrical panel are well tightened. Verify that all electrical components are in good working conditions. Earth connections Refrigerant circuit Verify that earth wires and connections are properly fi xed. Verify that unit is free of leaks. In case of leakage, contact your distributor. Compressor Check compressor for oil leaks. In case of leakage, contact your distributor. Check that compressor has no signs of damage, otherwise contact your distributor. Check for abnormal noises and vibrations. Fan motor Check the fi ns of the motor for dirt and clean if needed. Check for abnormal noises. Contact your distributor when fan or motor are damaged. 7. DISPOSAL Disposal of unit and related parts must be handled in accordance with the relevant local and national regulations. - Collect the refrigerant taking care not to disperse it into the environment and then send it to authorised col lec tion centres. - The lubricating oil must also be collected and sent to authorised collection centres for disposal. - Dismount the various components and the structure and sort the various materials into separate groups for disposal. Operation manual YNRA/EN/1206- pag 20/20