Fujitsu Airstage AOU72RLAVL Installation Manual

En-157.6.2 Procedures to enable automatic address setting on indoorunitsCheck that the rotary switch IU AD on the indoor unit PC board is set to “00”. If it is not setto “00”, it means the address of that device is not set. (Factory default is “00”).Turn on the power of the indoor and outdoor units.• When the system is normal, nothing will be displayed on the 7-segment display.• When ERROR is displayed, inspect the units.Use the “MODE/EXIT”, “SELECT”, and “ENTER” buttons on the outdoor unit PC board toconfigure settings according to the procedures below.1: Function setting(The display when the main power is turned on)Set to Function mode [F3].(When [F4] to [F9] are displayed, continue to pressthe “SELECT” button until [F3] is displayed.)Press the “SELECT” button until “11” is displayed.Press the “ENTER” button for more than 3 seconds.EndThe number of indoor units with normal settings will bedisplayed at the first 2 digits of the 7-segment LED display.The number of indoor units with error will be displayed atthe last 2 digits.NOTE:After the “ENTER” button is pressed, the end processingwill occur for about 30 seconds. During this period, the7-segment will blink.Automatic address setting forindoor unitsFirst 2 digits Last 2 digits7.7. Resistance measurement of transmission cable(Measure with breaker OFF)CAUTIONDo not turn on the power if the resistancebetween the terminals of the transmissioncable is abnormal. Otherwise, the PCboard may be damaged.Measure the resistance between 2 termi-nals of a transmission cable.(1) Transmission cable connectingindoor units, outdoor units, andsignal amplifiersMeasure the resistance of the signalamplifier terminal and the terminal ofthe indoor and outdoor units con-nected farthest away from the devicewhere terminal resistor is measured.A value from the table is displayed,depending on the distance from thesignal amplifier and the device wherethe terminal resistor is set.This value is an estimate.(2) Transmission cable connecting out-door units in a refrigerant systemThe resistance between the terminalsof the transmission cable is 45-60 Ω.This value is an estimate.Distance from terminal resistor[ft (m)]0 ~328(0 ~100)~656(~200)~984(~300)~1,312(~400)~1,640(~500)Approximate resistance (Ω)0 ~50A short circuit somewhere or 2or more termination resistors areconnected5060708090100110120130140150160170180190~Faulty contact or wiring length over1,640 ft (500 mm)1K~∞Faulty contact, open circuit, or notermination resistor8. PIPE INSTALLATION IIFig. A Connection system Fig. BOutdoor unitPressuregaugeVacuumpump ScalePressure regu-lating valveNitrogenIndoorunitIndoorunitService hosewith valve coreChargingportChargingport cap3-wayvalveConnectingpipeBlank capHexagon wrench sizeLiquid valve: 4 mmGas valve: 8 mm.Tightening torque [lbf·ft (N·m)]Model Liquid valve Gas valve Chargingport cap3-way valve Blank cap 3-way valve Blank cap72/96/1206.0 to 7.3(8.1 to 9.9)13.3 to 16.2(18.0 to 22.0)19.9 to 24.4(27.0 to 33.0)16.6 to 20.3(22.5 to 27.5)8.4 to 10.3(11.4 to 14.0)8.1. Sealing testCAUTIONUse only nitrogen gas.Never use refrigerant gas, oxygen, in flammable gas or poisonous gas to pressurize thesystem. (If oxygen is used, there is the danger of an explosion.)Do not apply shock during sealing test.It can rupture the pipes and cause serious injury.Do not turn on the power unless all operations are complete.Do not block the walls and the ceiling until the sealing test and the charging of therefrigerant gas has been completed.After connecting the pipes, perform a sealing test.Recheck that the 3-way valve are closed before performing a sealing test. (Fig. B)Pour nitrogen gas through both the liquid pipe and the gas pipe.Pressurize nitrogen gas to 609 psi (4.2 MPa) to perform the sealing test.Check all flare connection areas and brazed areas.Then, check that the pressure has not decreased.Compare the pressures after pressurizing and letting it stand for 24 hours, and check thatthe pressure has not decreased.* When the outdoor temperature changes 9 degrees F (5 degrees C), the test pressurechanges 7.25 psi (0.05 MPa.).If the pressure has dropped, the pipe joints may be leaking.If a leakage is found, immediately repair it and perform a sealing test again.* Decrease the pressure of nitrogen gas before blazingAfter completing the sealing test, release the nitrogen gas from both valves.Release the nitrogen gas slowly.8.2. Vacuum processCAUTIONDo not turn on the power unless all operations are complete.If the system is not evacuated sufficiently, its performance will drop.Be sure to evacuate the refrigerant system using a vacuum pump.The refrigerant pressure may sometimes not rise when a closed valve is opened afterthe system is evacuated using a vacuum pump. This is caused by the closure of therefrigerant system of the outdoor unit by the electronic expansion valve. This will notaffect the operation of the unit.Use a clean gauge manifold and charging hose that were designed specifically for usewith R410A. Using the same vacuum equipment for different refrigerants may damagethe vacuum pump or the unit.Do not purge the air with refrigerants, but use a vacuum pump to evacuate the system.• If moisture might enter the piping, follow below. (i.e., if doing work during the rainyseason, if the actual work takes long enough that condensation may form on theinside of the pipes, if rain might enter the pipes during work, etc.)• After operating the vacuum pump for 2 hours, pressurize to 7.25 psi (0.05 MPa) (i.e.,vacuum breakdown) with nitrogen gas, then depressurize down to 500 microns (-100.7kPa) for an hour using the vacuum pump (vacuum process).• If the pressure does not reach 500 microns (-100.7 kPa) even after depressurizing forat least 2 hours, repeat the vacuum breakdown - vacuum process.After vacuum process, maintain the vacuum for an hour and make sure the pressuredoes not rise by monitoring with a vacuum gauge.

/ 19

Related manuals for Fujitsu Airstage AOU120RLAVL