Haier 2U40S2SM1FA Service Manual page 8

Check the grounding, and repair it if the equipment is not properly grounded. Improper grounding can
cause an electrical shock.
Be sure to measure the insulation resistance after the repair, and make sure that the resistance is 1 M
ohm or higher.
Faulty insulation can cause an electrical shock.
Be sure to check the drainage of the indoor unit after the repair.
Faulty drainage can cause the water to enter the room and wet the furniture and floor.
1.2.4 Using Icons
Icons are used to attract the attention of the reader to specific information. The meaning of each icon is described in
the table below:
1.2.5 Using Icons List
Icon
Note
Caution
Warning
1.2.6 Embedded wire checking before installation
Check the embedded wire diameter suitable to request:
(Power supply from indoor: 2.5kw ≥1.0mm
2
≥1.0mm )
Check the embedded wire are four roots, L/N/COM/GND; GND is needed, if not, thunder or high voltage wave
from power grid will impact to the performance
Using a multi-meter to test short circuit of the four roots wires, make sure no short circuit happen.
Type of Information
Note
Caution
Warning
Reference
Description
A "note" provides information that is not indispensable, but may
nevertheless be valuable to the reader, such as tips and tricks.
A "caution" is used when there is danger that the reader, through
incorrect manipulation, may damage equipment, loose data, get
an
unexpected result or has to restart (part of) a procedure.
A "warning" is used when there is danger of personal injury.
A "reference" guides the reader to other places in this binder or in
this manual, where he/she will find additional information on a
specific topic.
2 2
3.5kw,5kw ≥1.5mm 7kw ≥1.0mm
6
Introduction
2
; Power supply from outdoor
Domestic air conditioner