43
DC Inverter Multi VRF System II
Service Manual
IDUs and between the IDU and ODU.
Communication cable selection for ODU and IDUs.
Wire Type
Communication Cables
Between IDU and Indoor
(Outdoor) Unit L(m)
Number of Wire Pieces x
Wire Diameter (mm2)
Wire Standard Remark
Common sheath twisted
pair copper core (RVV)
L≤1000 ≥2×0.75 GB/T 5023.3-2008
If the wire diameter is
enlarged to 2×1mm2, the
overall communication
length can reach 1500 m.
Communication cable selection for IDU and wired controller
Wire Type
Total Length of
Communication Cables
of the IDU and Wired
Controller L(m)
Number of Wire Pieces x
Wire Diameter (mm2)
Wire Standard
Remark
Common sheath twisted
pair copper core (RVV)
L≤250 ≥2×0.75 GB/T 5023.3-2008
communication length
cannot exceed 250 m.
3.5 Power cable
Only copper conductors can be used as power cables. The copper conductors must meet relevant national standard and satisfy the
carrying capacity of unit.
3.6 Hanger rod and support
(1) Hanger rod: M8 or M10;
(2) U-steel: 14# or above;
(3) Angle steel: 30mm×30mm×3mm or above;
(4) Round steel: Φ10mm or above.
4 Installation of outdoor unit
4.1 Check before installation
(1) Before installation, please check the power cord if it complies with the power supply requirement on the nameplate. Make sure the
power supply is safe.
(2) This air conditioner must be properly grounded through the receptacle to avoid electric shock. The ground wire shouldn’t be
connected with gas pipe, water pipe, lightning arrester or telephone line.
(3) Maintain good air circulation to avoid lacking oxygen.
(4) Read this manual carefully before installation.
4.2 Selection of installation site
(1) Select a location which is strong enough to hold unit’s weight so that unit can stand still and erect.
(2) Make sure the unit is not exposed to sun and rain. And the location can resist dust, typhoon and earthquake.
(3) Please keep the unit away from inammable, explosive and corrosive gas or waste gas.
(4) Make sure the location has space for heat exchange and maintenance so that unit can operate reliably with good ventilation.
(5) ODU and IDU should stay as close as possible to shorten the length of refrigerant pipe and reduce bend angles.
(6) Select a location which is out of children’s reach. Keep the unit away from children.
4.3 Carrying and installing outdoor unit
When carrying the outdoor unit, hang the unit in four directions with two sufcient ropes. In order to avoid excursion from the center, the
angel of ropes must be smaller than 40º during hanging and moving.
4.4 Installation notices
ّ
In order to ensure proper operation, the selection of installation site must conform to the following principle:
ّ
The discharged air of outdoor unit will not ow back and there is sufcient space around the unit for maintenance;
ّ
The installation site must be well ventilated to ensure sufcient air intake and discharge. Make sure there is no obstacle at the air
inlet and air outlet. If there is any obstacle, please remove it;
ّ
The installation site shall be able to withstand the weight of outdoor unit and capable for soundproof and vibration. The air outlet
and noise of unit will not affect neighbors;
ّ
The hanging of outdoor unit must use appointed hanging hole. Pay attention to protect the unit during hanging and installation.
Prohibit hitting the sheet metal to avoid rust in the future.
ّ
Avoid direct sunlight;
ّ
The rain and condensation water can be drained out smoothly;
ّ
The outdoor unit will not be embedded by the snow and not affected by garbage and oil smog;
ّ
The installation of outdoor unit shall adopt rubber damping pad or spring damper to reduce noise and vibration;
ّ
The installation dimension shall accord with the installation requirement of this manual and the outdoor unit must be xed at the
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