FAQ
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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.
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Heating performance is bad + - Abnormal of control
circuitry - Contact the service
center - The outdoor
environment temperature is lower than -5℃ - Affect the function
of air conditioner -
Heat pharmaceutical leaks
- Contact service
center - Room temperature is
set too low to heat - Increase the set
temperature - 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
- Abnormal of control
-
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
well - The LCD frame case is
not fixed well
- Fix the frame case
-
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
terminal
- Wireless remote
-
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
broken - Change commutate
diode -
Transformer is broken
- Change the
transformer - 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
voltage - 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