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Water pipe
Engineering
Procurement
Cable and
others
Vacuum pump: Flow: 2–4 L/s, absolute vacuum: ≤ 60 Pa.
Pressure gauge and leather hose: Dedicated to R410A, pressure gauge
measurement range ≥ 4.0 MPa, and the leather hose tolerance range ≥ 4.5 MPa.
Special Tools
Welding torch and welding rod: Silver-copper welding rod that contains 5% of
and Materials
silver.
Requirements
Nitrogen reducing valve: A reducing valve must be installed on the head of the
nitrogen cylinder, and the reducing valve range ≥ 4.0 MPa.
Dry nitrogen.
2.1
R410A Refrigerant
Do not use unqualified refrigerant. Huawei will not be liable for any equipment damage caused
by unqualified refrigerant.
Refrigerant from name brands such as DuPont, Daikin, and Honeywell are recommended. You
can verify the refrigerant authenticity in the following ways:
1. Dial the refrigerant manufacturer's hotline to confirm the refrigerant manufacturer
authenticity.
2. Place the refrigerant tank indoors for 24 hours. Use a point thermometer to measure the
outer surface temperature of the refrigerant tank (figure 1), and connect a pressure gauge
to the tank to measure the internal pressure (figure 2). Find the saturation pressure
corresponding to the measured outer surface temperature from the table on the next page.
If the deviation between the saturation pressure and the measured internal pressure is
greater than 0.2 MPa, the refrigerant does not meet the requirements, and needs to be
replaced.
Humidifier water inlet pipe (optional with humidifier):
Rigid pipe conversion adapter: G 1/2-inch outer screw thread to rigid
pipe connector, rigid pipe (made of PP-R or other materials)
Hose conversion adapter: G 1/2-inch outer screw thread to pagoda
connector, hose (made of EPDM or other materials)
Drainpipe:
Rigid pipe conversion adapter: BSPP 1/2-inch inner screw thread to
rigid pipe connector, rigid pipe (made of PP-R or other materials)
Hose conversion adapter: BSPP 1/2-inch inner screw thread to
pagoda connector, hose (made of EPDM or other materials)
Thermal insulation foam: thickness ≥ 6 mm
Outdoor unit power cable (3 x 6 mm
outdoor units (3 cores outdoor shielded cable, 16-22 AWG), M10
expansion bolts (4 PCS)
2
), signal cable for the indoor and
3
1 MPa = 10 bar
1 MPa ≈ 145 psi
1 MPa ≈ 10.2 kgf/cm
2
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