Gree GWH18RC-K3DNA1A, Service Manual

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NOTE:
A large-capacity electrolytic capacitor is used in the outdoor unit controller(inverter).Therefore,if the power supply is
turned off,charge(charging voltage DC280V to 380V)remains and discharging takes a lot of time.. After turning off the
power source,if touching the charging section before discharging, an electrical shock may be caused. Discharge the
electrolytic capacitor completely by using soldering iron,etc.
<Discharging method>
(1)remove the inverter cover(Outdoor Unit)
(2)As shown below,connect the discharge resistance ( approx.100 ¡ , 20W)or plug of the soldering iron to voltage b - terminals of the
electrolytic capacitor ( test 3 “D” and “E” point) on PC Board for 30s, and then perform discharging
Be cautious during installation and maintenance. Do operation following the regulations to avoid electric shock and casualty or even death
due to drop from high attitude.
* Static maintenance is the maintenance during de-energization of the air conditioner.
For static maintenance, make sure that the unit is de-energized and the plug is disconnected.
*dynamic maintenance is the maintenance during energization of the unit.
Before dynamic maintenance, check the electricity and ensure that there is ground wire on the site. Check if there is electricity on the hous-
ing and connection copper pipe of the air conditioner with voltage tester. After ensure insulation place and the safety, the maintenance can
be performed.
At times such as when the circuit board is to be replaced, place the circuit board assembly in a vertical position.
Normally,diagnose troubles according to the trouble diagnosis procedure as described below.(Refer to the check points in servicing written
on the wiring diagrams attached to the indoor/outdoor units.)
No. Troubleshooting procedure
1
2
Judgement by Flashing LED of Indoor/Outdoor Unit
3 How to Check simply the main part