DC INVERTER MULTI VRF INSTALLATION
96
system free of leakage.
5. Add a dual-way filter on liquid pipe side.
6. For multiple systems, please mark them properly.
Carry out leakage detection under pressure after welding.
Purge and make leakage
detection under pressure
1. Purge the system clean.
2. Keep the pressure for 24 hours
Except for the influence by temperature, it is deemed
acceptable if pressure drop is within 0.02MPa. (With the
temperature change by 1?, the pressure will change by
approx. 0.01MPa).
Thermal insulation
1. The thermal insulation tube must meet the specifications.
2. Seal between the thermal insulation pipes to avoid air
entry.
Installation of outdoor unit
1. Select the installing position correctly.
2. Build the foundation according to the anchor bolt position
and the dimension of outdoor unit;
3. Build the damping device properly.
4. Avoid sharp knock when handling the outdoor unit. The
inclination angle shall not be higher than 15°
Connection of indoor unit and outdoor unit
1. Tighten the nuts;
2. Provide proper protection to the outdoor connection pipe,
communication wires and power supply.
Leakage detection under pressure
Keep the pressure for 24 hours. Except for the influence by
temperature, it is deemed acceptable if pressure drop is within
0.02MPa. (With the temperature change by 1℃, the pressure
will change by approx. 0.01MPa).
Vacuuming
1. Establish vacuum simultaneously in the gas pipe and
liquid pipe;
2. The vacuuming time shall be long enough.
Put still for 1 hour after vacuuming. It is deemed acceptable if
the pressure will not rise.
Add refrigerant
Add refrigerant according to the volume as specified on the
engineering drawing.
Open the valve of outdoor unit
Commissioning of complete unit
Remarks:
1) Described above are general working procedures. The procedures might vary with the site conditions.
2) For detailed installation rules, please see the description in each chapter.
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