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1. Insulated resistance
The insulated resistance must be more than2MΩ.
2. Grounding work
After finishing grounding work, measure the grounding resistance by visual detection and grounding
resistance tester. Make sure the grounding resistance is less than 4Ω.
3. Electrical leakage check (performing during test running)
During test operation after finishing installation, the serviceman can use the electroprobe and
multimeter to perform the electrical leakage check. Turn off the unit immediately if leakage happens.
Check and find out the solution ways till the unit operate properly.
11.2 Gas leak check
⚫ Soap water method:
Apply a soap water or a liquid neutral detergent on the indoor unit connections and outdoor unit
connections by a soft brush to check for leakage of the connecting points of the piping. If bubbles
come out, the pipes have leakage.
⚫ Leak detector
Use the leak detector to check for leakage.
12. Water drainage
Gradient and Supporting
1) Keep the drainpipe sloping downwards at a gradient of at least 1/100. Keep the drainpipe as short
as possible and eliminate the air bubble.
2) The horizontal drainpipe should be short. When the pipe is too long, a prop stand must be installed
to keep the gradient of 1/100 and prevent bending. Refer to the following table for the specification of
the prop stand.
3) Precautions
The diameter of drainpipe should meet the drainage requirement at least.
The drainpipe should be heat-insulated to prevent atomization.
Drainpipe should be installed before installing indoor unit. After powering on, there is some
water in water-receiver plate. Please check if the drain pump can operate correctly.
All connection should be firm.
Wipe color on PVC pipe to note connection.
Climbing, horizontal and bending conditions are prohibited.
The dimension of drainpipe can’t less than the connecting dimension of indoor drainpipe.
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