34
Unit Installation
(2) There are direct pass and bypass for the water valve and they can be selected based on actual 
conditions. See the gure below for the working principle for the water valve.
Power lines
Switch
Bypass
Inlet pipe
FCU
Outlet pipe
5 Electric wiring
5.1 Precautions for electric wiring
(1) All electric wiring should be performed by the qualied technical in accordance with local standards, 
regulations and this manual.
(2) The specialized electric circuit with rated voltage should be used for the power supply.
(3) Do not pull the power lines by force.
(4) The power lines should be sized sufciently. The damaged power lines and connection lines should 
be replaced by specialized lines.
(5) The unit should be connected to the specialized grounding device by the qualied servicemen. 
For the xed lines, there should be the breaker and air switch with sufcient capacity. The air 
switch should be of the magnetic or electric trip-off functions so as for shortcutting and overloading 
protection.
(6) The unit should be earthed reliably. The yellow-green line is the grounding line. Do not put it into 
other use, or cut it. The grounding line cannot be xed with self-tapping screws; otherwise it would 
lead to electric shock. The grounding line cannot be connected to the running water line, the gas 
line, the drain line and where it is not approved.
(7) User power should be soundly earthed rather then be connected to these positions including water 
pipes, gas lines, drain pipes and others proved unsecure by professionals.
5.2 Wiring steps
(1) Open the electric box and pull the power lines and connection lines of the electric water valve 
through the rubber rings. Then, x them with the wire clamps. 
(2) Perform wiring in accordance with the electric wiring diagram.
(3) Fix the lines with the wire clamps. Mount its cover to the electric box.