Daikin RWEYQ8T8Y1B Installation And Operation Manual

Also see for RWEYQ10T8Y1B: Installation and operation manual

Contents

Installation and operation manual52 RWEYQ8+10T8Y1BVRV-W IV System Air Conditioner4P399208-1 – 2015.01Symptom 4: The fan strength does not correspond to the setting The fan speed does not change even if the fan speedadjustment button in pressed. During heating operation, whenthe room temperature reaches the set temperature, the outdoorunit goes off and the indoor unit changes to whisper fan speed.This is to prevent cold air blowing directly on occupants of theroom. The fan speed will not change even when another indoorunit is in heating operation, if the button is pressed.Symptom 5: The fan direction does not correspond to thesetting The fan direction does not correspond with the user interfacedisplay. The fan direction does not swing. This is because theunit is being controlled by the micro computer.Symptom 6: White mist comes out of a unitIndoor unit: When humidity is high during cooling operationIf the interior of an indoor unit is extremely contaminated, thetemperature distribution inside a room becomes uneven. It isnecessary to clean the interior of the indoor unit. Ask your dealerfor details on cleaning the unit. This operation requires aqualified service person. Immediately after the cooling operation stops and if the roomtemperature and humidity are low. This is because warmrefrigerant gas flows back into the indoor unit and generatessteam.Symptom 7: The user interface display reads "U4" or "U5" andstops, but then restarts after a few minutes This is because the user interface is intercepting noise fromelectric appliances other than the air conditioner. The noiseprevents communication between the units, causing them tostop. Operation automatically restarts when the noise ceases.Symptom 8: Noise of air conditionersSymptom 8.1: Indoor unit A "zeen" sound is heard immediately after the power supply isturned on.The electronic expansion valve inside an indoor unit startsworking and makes the noise. Its volume will reduce in aboutone minute. A continuous low "shah" sound is heard when the system is incooling operation or at a stop.When the drain pump (optional accessories) is in operation, thisnoise is heard. A "pishi-pishi" squeaking sound is heard when the system stopsafter heating operation.Expansion and contraction of plastic parts caused bytemperature change make this noise. A low "sah", "choro-choro" sound is heard while the indoor unit isstopped.When another indoor unit is in operation, this noise is heard. Inorder to prevent oil and refrigerant from remaining in the system,a small amount of refrigerant is kept flowing.Symptom 8.2: Indoor unit, outdoor unit A continuous low hissing sound is heard when the system is incooling or defrost operation. This is the sound of refrigerant gasflowing through both indoor and outdoor units. A hissing sound which is heard at the start or immediately afterstopping operation or defrost operation. This is the noise ofrefrigerant caused by flow stop or flow change.Symptom 8.3: Outdoor unit When the tone of operating noise changes.This noise is caused by the change of frequency.Symptom 9: Dust comes out of the unit When the unit is used for the first time in a long time.This is because dust has gotten into the unit.Symptom 10: The units can give off odours The unit can absorb the smell of rooms, furniture, cigarettes,etc., and then emit it again.Symptom 11: The display shows " " This is the case immediately after the main power supply switchis turned on and means that the user interface is in normalcondition. This continues for one minute.Symptom 12: The compressor in the outdoor unit does not stopafter a short heating operation This is to prevent refrigerant from remaining in the compressor.The unit will stop after 5 to 10 minutes.Symptom 13: The inside of an outdoor unit is warm even whenthe unit has stopped This is because the crankcase heater is warming thecompressor so that the compressor can start smoothly.Symptom 14: Hot air can be felt when the indoor unit is stopped Several different indoor units are being run on the same system.When another unit is running, some refrigerant will still flowthrough the unit.10. TroubleshootingIf one of the following malfunctions occur, take the measures shownbelow and contact your dealer.The system must be repaired by a qualified service person: If a safety device such as a fuse, a breaker or an earth leakagebreaker frequently actuates or the ON/OFF switch does notproperly work.Measure: Turn off the main power switch. If water leaks from the unit.Measure: Stop the operation. The operation switch does not work well.Measure: Turn off the power. If the user interface display indicates the unit number, theoperation lamp flashes and the malfunction code appears.Measure: Notify your installer and report the malfunction code.If the system does not properly operate except for the abovementioned cases and none of the above mentioned malfunctions isevident, investigate the system according to the followingprocedures.1 If the system does not operate at all: Check that there is no power failure.Wait until power is restored. If power failure occurs duringoperation, the system automatically restarts immediatelyafter the power supply is recovered. Check that no fuse has blown or breaker has worked.Change the fuse or reset the breaker if necessary.2 If the system goes into fan only operation, but as soon as it goesinto heating or cooling operation, the system stops: Check that the air inlet or outlet of the indoor unit is not blockedby obstacles. Remove any obstacle and make it well-ventilated.Check that the water inlet or outlet of the outdoor unit is notblocked. Check if the user interface display shows (time to clean theair filter). (Refer to "8. Maintenance" on page 51 and"Maintenance" in the indoor unit manual.) Check all valves in the water piping system. Open all valves. Check if the water filter is blocked. Clean the strainer.WARNINGStop operation and shut off the power if anythingunusual occurs (burning smells etc.).Leaving the unit running under such circumstances maycause breakage, electric shock or fire. Contact your dealer.