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4.11 Refilling volume of refrigerant
The refilling volume of refrigerant (R410A) is calculated according to the diameter and length of the pipe at the
liquid side of the indoor and air-conditioning units.
Diameters of pipe at the liquid side (mm)
Φ6.35
Φ9.52
Note: The R410A refrigerant must be weighed by an electronic scale and filled in the liquid state.
4.12 Stop valve instructions
1. It is closed when leaving the factory;
2. Open the valve counterclockwise or close the valve clockwise with a 6mm socket head wrench;
3. After completing the operation, tighten the valve cover;
4. R410A special tool shall be used to vacuumize the valve and fill the refrigerant at the service entrance. Fill the
refrigerant at the service entrance at the gas side, and vacuumize the valve at the service entrance at the liquid
side and the gas side simultaneously.
Service entrance
Valve cover
Valve stem
4.13 Thermal insulation of pipe
1. Apply thermal insulation to the pipes at the gas side and the liquid side respectively;
2. Use closed-cell thermal insulation materials, with the flame retardant grade of B1 and high temperature resis-
tance of 120℃;
3. Outer diameter of copper pipe ≤ Φ12.7 and thickness of thermal insulation cotton ≥ 15mm; outer diameter of
copper pipe ≥ Φ15.88 and thickness of thermal insulation cotton ≥ 20mm.
4. The nut joints of the indoor unit shall be performed thermal insulation
NOTE
•
The power supplies for the indoor and air-conditioning units shall be separately designed.
•
The power supply must be designed with a sub-circuit, and equipped with a current leakage protector and
a manual switch.
•
All indoor units in the same system shall be arranged on the same power circuit, and shall be turned on/off
the power simultaneously. It is not allowed to equip each indoor unit with a power switch.
•
The connecting wire system and the refrigerant pipe system of the indoor unit shall be incorporated into
the same system.
•
To reduce the interference, the indoor and air-conditioning communication cables shall use two-core or
three-core shielded twisted-pair cables instead of ordinary multi-core cables.
•
Conform to related national electrical standards.
•
Electrical wiring shall be done by a professional electrician.
4. Installation of Connecting Pipe
Table 4-7 Refilling Volume of Refrigerant
Refilling volume of refrigerant equal to the length of 1m pipe (unit: kg)
Opening direction
Fig. 4-10 Stop Valve Instructions
0.023
0.040
Vacuumizing
Opening direction
Liquid side
11
Refilling refrigerant
Gas side
V.1
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