|
12 English10-2 Temperature control operation checklist• After check operation is complete, check the temperature controlusing normal operation.(Heating is not possible if the outdoor temperature is 75°F (24°C) orhigher.)(1) Make sure the indoor and outdoor units are operating normally.(If liquid compression by the compressor or other abnormalnoises can be heard, stop the unit immediately, heat the crankcase for a sufficient amount of time, and try again.)(2) Check to see if cold (or hot) air is coming out of the indoor unit.(3) Press the fan direction and fan speed buttons on the indoor unitto see if they operate properly.• For around 5 minutes after the compressor stops, the compressorwill not run even if the “On/Off” button on the remote controller ispressed.• When the system operation is stopped by the remote controller, theoutdoor unit may continue operating for up to 1 minute.• Malfunction code “U3” is displayed if check operation is not per-formed using the test operation button the first time after installation.Perform the check operation in accordance with “10-1 Power On–Check Operation”.[Remote controller displays malfunction code](Check on a remote controller)• When using a central controller, see the installation manual or ser-vice manual which came with the central controller.[If nothing is displayed on the remote controller]• There might be a problem with the connections or communicationbetween the indoor unit and the remote controller.Make sure all the wiring is properly connected.CAUTIONTo the piping installer, To the electricianAfter the test operation, when handing the unit over to the customer,make sure the front panel on the unit and all screws are attached.10-3 Final refrigerant charge adjustmentIt is not necessary to do this final adjustment normally, but perform thefollowing operation only when the most adequate refrigerant charge forthe best performance is required and the piping length between the out-door and indoor units is less than 50 ft. (15 m).The outdoor temperature must be between 65°F (18°C) and 105°F (40°C).The number of revolutions of the compressor must be greater than orequal to the charge mode. (It can be confirmed by LED display on PCboard)The number of revolutions of the compressor LED display.( :Chargeable :Impossible to charge)Run the system for 60 minutes in cooling by the forced operation usingthe field setting mode 2, No.20 LED :ON, mode 2, No.7 LED :ON,(Refer to Service Manual.) to allow pressures to stabilize.Check subcooling of outdoor unit at LSV. Systems should have the tar-get subcooling in the table below.a. If the subcooling is low, add charge little by little to raise subcoolingto the target value. (The maximum additional charge is 2.2 lbs. (1kg))b. If the subcooling is high, remove charge to lower the subcooling tothe target value.11. ENERGY SAVING AND OPTIMUMOPERATIONThe unit is equipped with advanced energy saving functionality.Depending on the priority, emphasis can be put on energy saving orcomfort level. Several parameters can be selected, resultingin the optimal balance between energy consumption and comfort for theparticular application.Several patterns are available and explained below. Modify the param-eters to the needs of your building and to realize the best balancebetween energy consumption and comfort.Refer to Service Manual for changing the field settings.Setting definition: [A-B]=C; A=mode, B=setting NO., C=setting value.Malfunc-tion code Installation error Remedial actionE3The stop valve of outdoor unitis left closed.Open the gas-side stop valve and the liq-uid-side stop valve.Refrigerant overcharge.Recalculate the required amount of refrig-erant from the piping length and correctthe refrigerant charge level by recoveringany excessive refrigerant with a refriger-ant recovery unit.F6 Refrigerant overcharge.Recalculate the required amount of refrig-erant from the piping length and correctthe refrigerant charge level by recoveringany excessive refrigerant with a refriger-ant recovery unit.E4The stop valve of outdoor unitis left closed.Open the gas-side stop valve and the liq-uid-side stop valve.Insufficient refrigerant.Check if the additional refrigerant chargehas been finished correctly.Recalculate the required amount of refrig-erant from the piping length and add anadequate amount of refrigerant.F3Refrigerant overcharge.Recalculate the required amount of refrig-erant from the piping length and correctthe refrigerant charge level by recoveringany excessive refrigerant with a refriger-ant recovery unit.The stop valve of outdoor unitis left closed.Open the gas-side stop valve and the liq-uid-side stop valve.Insufficient refrigerant.Check if the additional refrigerant chargehas been finished correctly.Recalculate the required amount of refrig-erant from the piping length and add anadequate amount of refrigerant.U2 Insufficient power supply volt-ageCheck to see if the power supply voltageis supplied properly.U3 If check operation has not beenperformed. Perform check operation.U4 No power is supplied to out-door unit.Turn the power on for the outdoorunit.UA If no dedicated indoor unit isbeing used.Check the indoor unit. If it is not a dedi-cated unit, replace the indoor unit.UFThe stop valve of outdoor unit isleft closed.Open the gas-side stop valve and the liq-uid-side stop valve.If the right indoor unit piping andwiring are not properly con-nected to the outdoor unit.Make sure that the right indoor unit pipingand wiring are properly connected to theoutdoor unit.UHIf the transmission wiring hasnot be connected or it hasshorted.Make sure the transmission wiring is cor-rectly attached to terminals (X2M) F1/F2(TO IN/D UNIT) on the outdoor unit circuitboard.Model Target subcooling18·24 type 6±1°F (3.33±0.56°C)30·36 type 7±1°F (3.89±0.56°C)42 type 8±1°F (4.44±0.56°C)48 type 9±1°F (5.00±0.56°C)
|
