• FAQ for Commercial Air Conditioners +
    What to do when evaporating pressure is too low?
    Reason: It may be cool water not enough; or cool load low; or failure occurred at throttle
    orifice; or heat transfer at heat transfer tube of evaporator bad for the
    pollution like furring; or lack of refrigerant.
    Solution: Check the cool water circuit and refill the cool water to rated
    volume; or check the rated temperature at auto on/off device; or check if
    expand throttle is blocked; or clean the heat transfer tube; or fill the
    refrigerant to needed volume.
    What to do when condensing pressure is too high?
    Reason: It may be
    cooling water not enough; or capacity of cooling tower reduced; or temperature
    of cool water too high; or cooling capacity too high to increase the load at
    condenser; or non condensed gas exist; or heat transfer at condensing tube bad
    for the pollution like furring.
    Solution: Check the cool water circuit and adjust it to rated current flow; or
    check cooling tower and expand throttle etc. to lower (or rise) the temperature
    of cool water to rated temperature as soon as possible; or get rid of non
    condensed gas; or clean the tube.
    What to do when the difference of oil pressure is too low?
    Reason: It may be oil
    filter blocked; or oil pressure adjusting valve (gate gurgle valve) opened too
    wide; or outlet oil at oil pump decreased; or bearing abrades; or failure
    occurred at oil pressure meter (or sensor); or too many refrigerant mixed into
    lubricating oil (oil pressure is too low for oil bubbles when starting).

    Solution: Change the
    core of oil filter; or tighten the oil pressure adjusting valve so that the oil
    pressure rise to rated pressure; or disassembly to check; or change the
    bearing; or check oil pressure meter, reset the pressure sensor and change it
    when necessary; or do apply the oil heater when cooler stops to maintain rated
    oil temperature (check if wire of oil heater is breaking, and if the set
    temperature for oil heater to heat is correct).

    What to do when cool water is subcool?

    Reason: It may be
    cool water not enough; or cool load low
    Solution: Check the cool water circuit and refill cool water to rated volume;
    or wait for cool load rise.
    Over load at oil pump
    Reason: It may be oil
    pump broken; or resistance at oil circuit too great.
    Solution: Disassembly the oil pump to check; or check the oil circuit system
    like oil filter and other components, change them when necessary.

    What to do when oil temperature is too high?

    Reason: It may be
    cooling capacity of oil cooler lowered; or refrigerant supply for cooling oil
    cooler not enough for refrigerant filtering net is blocked; or bearing abrades.
    Solution: Adjust oil temperature adjusting valve; or clean refrigerant
    filtering net; or disassembly to repair or change bearing.
    What to do when water failure occur?
    Reason: It may be
    cooling water not enough; or failure at differential meter
    Solution: Check cool water pump and cool water circuit and adjust to normal
    flow volume; or check and repair differential meter.
    What to do when
    winding for main motor is superheat ?
    Reason: It may be
    power phase voltage unbalance; or voltage drop at power cord large; or
    operating with ultra low head; or refrigerant supply for cooling main motor not
    enough for refrigerant filtering net is blocked.

    Solution: Take
    measures to make power phase voltage balance; or take measures to lower voltage
    drop at power circuit; or clean the refrigerant filter net.

  • Heating performance is bad +
    Abnormal of control
    Contact the service
    The outdoor
    environment temperature is lower than -5℃
    Affect the function
    of air conditioner

    Heat pharmaceutical leaks

    Contact service
    Room temperature is
    set too low to heat
    Increase the set
    Doors or windows
    aren’t close well
    Close the door or
    window to preserve cool (heat)
    Air filter is dirty
    or blocked

    Clean filter to improve airflow

  • Big oscillation or noise is too loud +
    Screw is loose
    Tighten the screw
    There are foreign objects on the unit
    Remove the foreign objects
    Bracket of the unit
    is not installed steadily
    Fix the bracket or
    reinstall it

    Unit is not placed well

    Adjust the location
    of the units
    Compressor is not
    installed well, or the floor stand is not firm enough

    Check if the floor stand is firm

  • LCD flashes or full screen display when pressing the Transmit button +
    Change battery
    Low battery
  • Incomplete of the display in LCD +
    Fix the frame case
    The LCD frame case is
    not fixed well
  • The receiving distance of wireless remote controller is short +
     Low battery
    Change the battery
  • Wireless remote controller can’t receive signal (remote control type window unit) +
    Wireless remote
    controller has malfunction

    Change wireless remote controller

     Breakage or bad
    connecting of the receiving terminal

    Change receiving terminal or adjust connecting wire of
    receiving terminal

    Receiving terminal is loose
    Adjust the receiving
  • The treatment taken by protector when the compressor is over heated +
    Protector is in error
    Check if the contact
    points are connected by multimeter when the compressor is not over heated, if
    it isn’t connecting, change protector
    Compressor cannot run
    smoothly, crankshaft jammed or breakage of discharge valve
    Change compressor
    Capillary is blocked
    and inspiration temperature increases
    Change capillary

    Refrigerant is not enough or too much

    Adjust the amount of refrigerant

  • No response after energization +

    Integrated modular CPU broken

    Change integrated
    modular CPU

    Cool joint or breakage at manostat 7806

    Change manostat 7806
    Crystal oscillator or resetting circuit element is broken

    Change them

    Commutate diode is
    Change commutate

    Transformer is broken

    Change the
    Blow of the fuse
    Change fuse
  • The compressor can’t startup after energization +
    Compressor is open-circuit or short-circuit
    Change compressor
    Wrong wire connection
    Reconnect the wire
    The main On/Off
    switch is broken
    Change the main
    On/Off switch
    Compressor capacitor
    is broken
    Change compressor
    Set temperature of temperature controller is too high or temperature controller is broken
    Decrease the set temperature of temperature controller or change the temperature controller