Leakage Detection; Heat Insulation - HTW BIBLOCK PLUS -AV4WD2N8PLUS Manuel De L'utilisateur Et D'installation

● Please pay attention to avoid the components where it is connecting to the connecting pipes.
To prevent the refrigerant piping from oxidizing inside when welding, it is necessary to charge nitrogen, or oxide
●
will chock the circulation system.

7.2 Leakage detection

Use soap water or leakage detector to check every joint whether leak or not (Refer to Fig.7-2 ).Note:
A is high pressure side stop valve
B is low pressure side stop valve
C and D is connecting pipes interface of indoor and outdoor units
A
B

7.3 Heat insulation

In order to avoid the release of cold or heat from the connecting pipeline to the external environment during the operation of the equipment,
please take effective insulation measures for the gas pipe and liquid pipe separately
1) The gas side pipe should use closed cell foamed insulation material, which the fire-retardant is B1 grade and the heat resistance
over 120 ℃.
2) When the external diameter of copper pipe≤Φ12.7mm, the thickness of the insulating layer at least more than 15mm; When the
external diameter of copper pipe≥Φ15.9mm, the thickness of the insulating layer at least more than 20mm.
3) Please use attached heat-insulating materials do the heat insulation without clearance for the connecting parts of the indoor unit pipes.
CAUTION
Check point of indoor unit
Check point of outdoor unit
Fig.7-2
12
D C