Gree GUHD series - Page 101

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and black wires with a universal meter; The normal value is about several hundreds ohms, if the measure
value is beyond this range, it indicates there is a open circuit or the fan motor is defective.
Compressor: apart from the badly running environment, improper connection, or systematic abnormity,
if H5 still occurs frequently after the replacement of the electric control box, then it indicates that the
compressor is probably defective.
Four-way valve: pull out two purple wires and measure the resistance between them with a universal
meter to see if it is about 1~2K. If it is much larger, it indicates that there is a open circuit among the coils of
the four-way valve which then should be replaced.
If the fault is beyond the statement above, then please check the indoor unit.
2 .After the Replacement of the Electric Control Box of the Indoor Unit
If the fault remains after the replacement of the electrical control box of the indoor unit, then there is a
need to check if the wiring is proper and the fan motor and temperature sensor is in good condition. Besides,
if the fault is beyond the statement above, please check the outdoor unit.
2.2.4 Precautions
1. Prior to the replacement of the main board of the outdoor unit’s control box, it must be certain that it is
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a, test if there is a short circuit between any two of three IGBI pins. If so, the main board can not be
used.
b. test if there is a short circuit between the points P and N of the DC bus. If so, the main board can not
be used.
c. test if there is a short circuit between any U/V/W and P, U/V/W and N. If so, the main board can not
be used.
d. see the section 1.2.3 for the test point and testing method of IGBT and IPM module.
2. Each compressor is matched with only certain type main board of the electric control box, so prior to
the replacement of the main board, it must be sure what model the main board is; otherwise the main board
would fail to match with the compressor.
3 .As for the replacement of the compressor, it also must be sure what model the compressor is ( it
can be found on the label of the fan motor capacitor); otherwise the compress would failed to match with the
piping system and the electric control box.
4. Never allow any wire to contact the pipes, four-way valve, compressor, and sharp edge of the metal
sheet. And the earth leads of the compressor, fan motor and electric control box must be inside a separate
screw hole.
5. Necessary measurers should be taken to against water, moisture and static electricity. Besides,
during the dismantlement and installation of the electrical control box, a antistatic strip must be put on and do
not touch the component as much as possible.
6.The wiring should be done strictly according to the wiring diagram labeled on the electric control box
and each wiring terminal should be on the right place. Besides the wires can not be stretched too tightly or
else it would break away from the socket, connector or the insulating bushing. The bonding tie should be
kept 3mm-5mm long, as the longer one would cause unusual sound by the friction with the cover plate.