Chapter Ⅱ Installation（6. Electric Installation）
36
according to the national standard.
③The specification of circuit breaker in the above table is based on the conditions that the
ambient temperature is 40℃, the air switch is “D”. If it is not under the aforesaid conditions,
please adjust according to the specification manual of circuit breaker.
④If the length of power cord is more than 15m, please properly increase the sectional area of
power cord to prevent overcurrent.
⑤The capacity of air switch and diameter of power cord have not taken the external
connection of auxiliary electric heater into consideration.
⑥The yellow-green wire inside the unit is the earth wire. Do not connect the earth wire to
following places:
a. tap water pipe b. gas pipe c. blow-off pipe d. unreliable places.
⑦Safety notices for using water
Please use PPR plastic pipe to connect to direct hot water inlet, circulating water inlet and
water outlet respectively, and then connect to the exterior water pipe. If the plastic pipe is
self-prepared by the user, then the length of plastic pipe should not be less than the following
length: L≥70×R
2
, L is the pipe length (unit: cm), R is the inner semi-diameter of pipe (unit: cm).
If user installs water pump, auxiliary electric heater and solenoid valve and other
electric-charged parts, it is suggested to adopt PPR plastic pipe and length of plastic pipe from the
electric-charged part to the place where human body can touch the water should satisfy the above
requirements. If using metal pipe, both ends of metal pipe must be grounded reliably.
Set reliable earth device for heating water tank and water supply pipe network.
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