176
DC Inverter Multi
VRF Service Manual
2�3 Exhaust Temperature Protection
Error display on hand controller: E4
Outdoor units mainboard indicator: led4: dark; led3: dark; led2: blink; led1: blink
Indoor units mainboard indicators:
Patio indoor units: red led: blink:red led:blink; green led:dark; yellow led:dark
FY wall-mounting motor: red led:blink; yellow led:dark
New FY wall-mounting motor: red led:blink; green led:dark; yellow led:dark
Hanging indoor units: red led:blink; green led:dark; yellow led:dark
No
Yes
No
No
No
No
No
Yes
Yes
Yes
No
No
Yes
Yes
Yes
Yes
Exhaust Temperature Protection
Measure if the
exhaust temperature of compressor
reaches 118��
Measure if the
resistance of temperature
sensor is correct?
When the exhaust
temperature of compressor is
higher than 107
�
, check if the corresponding
liquid bypass plug is connected
through?
Replace the mainboard of outdoor unit
Replace the corresponding
exhaust temperature sensor
Check if the corresponding
liquid bypass sub-assembly is in good
condition, e.g. if the solenoid valve is in good
condition and if the capillary
pipe is blocked?
Replace the liquid bypass sub-assembly
When the exhaust
temperature of compressor is higher than
102�, Whether the openness of corresponding
indoor unit electronic expansion
valve is increased?
Check if the electronic
expansion valve is correct
Change the outdoor unit mainboard
Change corresponding electronic
expansion valve Sub-Assy
When the exhaust
temperature of compressor is
higher than 110�, Whether compressor
reduces its capacity?
Change the mainboard chip of the outdoor units
Check if the capacity
output of outdoor unit is equal
to the capacity demand of
indoor units?
Refer to the dial-up of indoor and outdoor unit
Repair the leakage of system pipe and
add refrigerant according to the
required volume
Notes:
(1) The AC frequency conversion machine includes air-out senor and shell top sensor.
(2) The temperature protection point in different machines are different.
(3) There is no liquid refrigerant by-pass in frequency conversion machine.
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