Related Manuals for Nobu NBFS-48IDU
Summary of Contents for Nobu NBFS-48IDU
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Page 1: Service Manual
Floorstanding Air-Conditioning Unit MODELS NBFS-48IDU/NBFS-48ODU Floorstanding Air-Conditioning Unit Service Manual English... -
Page 2: Table Of Contents
Table of Contents Summary …………………………………………………………..........………….3 Installation ………………………………………………………..........………….4 Exploded view and part list …………………………………..........…………21 Operation principle …………………………………………..........…………23 Wiring diagrams …………………………………………… ..........…………24 PCB function ……………………………………………...........…..……26 Display fault ……………………………………………..........…...……33 Troubleshooting……… ……………………………………. ………………......…………37... -
Page 3: Summary
1、Summary... -
Page 4: Installation
2、INSTALLATIO N BASIC ACCESSORIES This Installation section explains how and where to connect this new air conditioner. Please read make sure all acces- sories are included as shown below and read manual thoroughly. This Installation section is provided to assist the per-son knowledgeable in air conditioner installation and should not be installed by anybody who is not thoroughly familiar with this type of installation. - Page 5 NOMENCLATURE AND FUNCTIONS OF VARIOUS PARTS Because there are many models,features and appearance will vary,only introduce the follow pattern,Others please refer to using Indoor Units...
- Page 6 Outdoor Units Features and appearance will vary,all the figure give a demonstration to introduce the function Operation Panel...
- Page 8 use of remote controller...
- Page 10 Setting of Present Time This remote controller has the clock function and time setting is available: 1 Remove the back cover of remote controller and press "CLOCK" button, and it displays "0: 00", Press "HOUR" button once to increase 1 hour, After setting the hour, press "MIN"...
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Page 11: Before Installation
Set SLEEP Mode with Remote Controlle Use this mode for quiet environment. In running of air conditioner, operate as the following: Press SLEEP button The air noise from the indoor unit will be lower, In the SLEEP mode, press SLEEP button again to cancel the sleep mode. Note: After setting the SLEEP mode, if the air conditioner is in COOL or DEHUMIDIFY mode ,the set temperature will automatically increase 1 °C after 1 hours, If the air conditioner is in HEAT mode while setting SLEEP mode, the set... -
Page 21: Exploded View And Part List
3. indoor explosive view for 40k... - Page 22 outdoor explosive view for 40k...
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Page 23: Operation Principle
4. Operation principle indoor unit indoor fan connection pipe connection pipe outdoor unit pay attention to sealing outdoor fan cooling heating 1.compressor 2. 4-way value 3.condenser 4.flow divider for condenser 5.Non-return valve 6.auxiliary capillary 7.cooling capillary 8.high-pressure valve 9.flow divider for evaporator 10.evaporator 11. -
Page 24: Wiring Diagrams
5. CIRCUIT DIAGRAM 43K INDOOR... - Page 25 43K OUTDOOR...
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Page 26: Pcb Function
PCB function: NOTE: Ts is the set temperature, Tr is indoor room temperature, TP1 is indoor coil pipe temperature, TP2 is outdoor coil pipe temperature. Cooling ● Start up the compressor: when the room temperature is more than or equal to Ts+1 ℃ , compressor → start-up ●... - Page 27 10° C 0° C -15° C compressor outdoor blower fan indoor blower fan four-way valve Heating (only applicable to dual temperature units) ● Start up the compressor: when the room temperature is less than or equal to Ts-1 ℃ , compressor → start-up ●...
- Page 28 Tp1 ≥ 26 ℃ and Tp1 ≥ Tr+5 ℃ ＜ Tr+5 ℃ over 6 MIN start-up start-up COMPRESSOR start-up outdoor start-up start-up start-up blower fan four-way 2 MIN 2 MIN start-up start-up start-up valve 5 MIN 5 MIN b l o w e r f a n lower lower speed...
- Page 29 Defrosting (only applicable to the heating mode) 1. the intelligent defrost In the heating mode, the electric control board checks and compares the temperature of indoor room and indoor coil pipe after the compressor works for a while; judge whether the outdoor heat exchanger part is frosted or not according to conditions such as the change of indoor coil pipe temperature;...
- Page 30 start defrost end defrost defrost start-up shutdown compressor start-up start-up shutdown outdoor shutdown start-up start-up blower fan our-way shutdown start-up valve start-up d o o r b l o w e r f a n start-up shutdown start-up Dehumidification Dehumidification running is to eliminate the water vapor in the air by using the cool circulating capacity, but the dehumidification will not decrease the indoor temperature in great deal.
- Page 31 In the ventilation mode, the set temperature range is 17 ℃ ~31 ℃ . When ventilating, the compressor, outdoor blower fan, four-way valve and electric heating are all closed and the indoor blower fan is running at the set speed. c o m p r e s s o r o u t d o o r b l o w e r f a n...
- Page 32 When the time on or time off is used, the clock of remote controller shall be corresponding to the current clock and the timing times is less than or equal to 24 hours, when the timing time is reached, unit will start-up or shutdown.
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Page 33: Display Fault
7. Failure display running timer lamp(flicker lamp(flicker Fault content The reason of fault and solution times) times) 1、Check whether the connection of the outdoor unit and indoor unit is one to one, otherwise connect the L, N and communication line of the indoor unit and outdoor unit one to one. - Page 34 the motor should be replaced when it is damaged. 3、Check whether the controllable silicon and other components on the electric control board have damaged, replace the controllable silicon or electric control board when they are damaged. 1、Check whether the connection of the compressor is reliable, otherwise connect firmly again.
- Page 35 components or integrated circuit is damaged, the electric control board should be replaced. 1、Power on again, and check the operation of the compressor is normal. 2、Check whether the connection of the compressor is reliable, otherwise repair. light compressor drive fault 3、Check whether the components on the electric control board have been damaged, if they are damaged, the components or the electric...
- Page 36 the sensor and the detection circuit are abnormal. 1、Check whether the supply voltage is out of rang from 150 to 270V low or high voltage 2、Check the voltage detection circuit of the IPM light protection base board is abnormal, if it is abnormal, the IPM base board or the electric control board should be replaced.
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Page 37: Troubleshooting
8. TROUBLE SHOOTING Indoor Tr sensor error Is CN (Tr sensor connector) Connect CN properly. connected properly? Is Tr sensor resistance value Replace TA sensor. (5KΩ at 25℃) normal? Indoor P. C. board is defective. Replace P. C. board. Indoor TP1 sensor error Is CN (TP1 sensor connector) Connect CN properly. - Page 38 Causes to leak the switch to Has not supplied power Leaks the switch to trip reposition Inspects the air- The waiting power supply conditioner entire Electric power or relates with the electric machine electric power breakdown power company supply In inspection room Inspection room electrically controlled machine remote control...
- Page 39 <Primary check> (1) Is the room temperature higher than the preset temperature in cooling operation? (2) Is the crossover cable connected properly? Turn on power supply. Does OPERATION Check power supply. indication indicate? Does compressor delay Is resistance value of room Room sensor or heat three minutes by sensor (Tr) and heat exchanger...
- Page 40 The unit does not beep at all. Press START/STOP button. OPERATION indication on indoor unit is not indicated. Is transmission mark indicated? Press RST button on remote control with tip of pencil. Is receiver on indoor unit exposed to direct sunlight? Does indoor unit Is there any thyristor operate when...
- Page 41 Trouble Is the power applied to the Check power supply mains or unit? interconnection wires Is the power normal? check Check the wiring of indoor and the voltage between L&N of outdoor terminal block Press the power ON/OFF button of wire control or remote control Control failure Does the beeper beep?
- Page 42 Floorstanding Air-Conditioning Unit...