Chapter Ⅱ Installation（5. Installation and Heat Insulation for Pipelines of Water System）
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（2）Installation Notes：
① When installing water level switch, please follow installation sketch map strictly.
One-level water level switch is equipped with G1/8” external thread and nut, and also one
L-type sheet metal piece (can be fixed on the water tank). The water level switch can be
tightened on the L-type sheet metal piece directly with nut, which is quite convenient.
Horizontal installation or large-angle inclination installation are prohibited, otherwise failure or
malfunction of water level switch may be caused and affect normal operation of unit.
② The distance between water level switch and its surrounding objects shall be not less than
300mm, in order to ensure normal operation of float. Otherwise, unit malfunction during
operation will be caused and damage the unit.
③ Hot water inlet and backwater inlet at user‟s side can‟t face water level switch, in order to
prevent inlet water flow from striking water level float and causing malfunction of water level
switch.
5.4 Heat Insulation Measures
1）Earth covering depth for the embedded leading pipes of construction should not be lower
than the depth of frost line, and should not be less than 500mm;
2）Note to take anti-frost measures when the PP-R pipes are installed in cold areas. Users
should take heat insulation measures both indoors and outdoors, the heat insulating thickness
should be defined by calculation according to the pipe diameter, thermal conductivity of heat
insulating material and ambient temperature, users can select by referring to the heat insulating
requirement of steel pipe;
3）The pipes installed outdoors should not be exposed under direct sunlight, or take shielding
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