Communication wiring between the indoor and outdoor units
The HRV and outdoor units communicate via the RS485 serial port.
The communication wiring between the HRV and outdoor units should be connected one unit after
another in a daisy chain from the outdoor unit to the final HRV unit. And the shielded layer must be
properly grounded, and a build-out resistor must be added to the last HRV unit to enhance the stability
of the communication system.
Incorrect wiring such as a star connection or a closed ring will cause instability of the communication
system and system control anomalies.
Use a three core shielded wire (greater than or equal to 0.75 mm2) for the communication wiring
between the indoor and outdoor units. Make sure the wiring is connected correctly. The connecting lead
for this communication wire must come from the master outdoor unit.
All shielded wiring in the network are interconnected, and will eventually connect to earth at the same
point " ”.
Communication wiring between the indoor unit and wired controller
The wired controller and the indoor unit can be connected in different manners, depending on the forms of
communication.
1. For a bidirectional communication mode:
Use 1 wired controller to control 1 indoor unit or 2 wired controllers (one master and one slave
controller) to control 1 indoor unit.(see Fig.4-4)
Use 1 wired controller to control multiple indoor units or 2 wired controllers (one master and one slave
controller) to control multiple indoor units. The maximum number of connections is 16.(see Fig.4-5)
2. For single direction communication mode:
Use 1 wired controller to control 1 indoor unit
The X1/X2, D1/D2 ports on the sides of the main control board and single direction communication port
are for different types of wired controllers.
For the specific connection method, refer to the instructions in the corresponding wired controller
manual to carry out the wiring and connections.
Handling the Electrical Wiring Connection Points
Once the wiring and connections are done, use tie straps to secure the wiring properly so that the
connection joint cannot be pulled apart by external force. The connection wiring must be straight out so
that the cover of the electrical box is level and can be closed tightly.
Use professional insulation and sealing materials to seal and protect the perforated wires. Poor sealing
may lead to condensation, and entry of small animals and insects that may cause short circuits in parts
of the electrical system, causing the system to fail.
X1 X2
X1 X2
X1 X2
Master wired controller Slave wired controller
Indoor unit 1
Wired controller 2
Wired controller 1
Fig. 4-5
Master wired controller Slave wired controller
Wired controller 2
X2
X1 D2 D1
Wired controller 1
X2 X1 D2 D1
Indoor unit 1
Indoor unit 2
Indoor unit n(n<=16)
●
●
●
●
●
●
●
Fig. 4-4
Do not use this unit in locations where flammable gas may exist. If
flammable gas comes into contact with the unit, a fire may occur,
which could result in serious injury or death.
Opera o Manual
There are two types of precautions as described below:
Warning: Failure to comply may lead to death or serious injury.
Caution: Failure to comply may lead to injury or damage of the
unit. Depending on the situation, this may also lead to serious injury.
Once the installation is completed, please keep the manual properly
for future reference. When this air conditioner is handed over to other
users, make sure that the manual is included with the handover.
Warning
•
•
If this unit exhibits any abnormal behavior (such as emitting
smoke) there is a danger of serious injury. Disconnect the power
supply and contact your supplier or service engineer immediately.
• The refrigerant in this unit is safe and should not leak if the system
is designed and installed properly. However, if a large amount of
refrigerant leaks into a room, the oxygen concentration will
decrease rapidly, which can cause serious injury or death. The
refrigerant used in this unit is heavier than air, so the danger is
greater in basements or other underground spaces. In the event of
a refrigerant leak, turn off any devices that produce a naked flame
and any heating devices, ventilate the room, and contact your
supplier or service engineer immediately.
• Toxic fumes may be produced if the refrigerant in this unit comes
into contact with naked flames (such as from a heater, gas
stove/burners, or electric appliances).
X1 X2
X1 X2
X1 X2
X
D1
T
XR
P
Q
X
E
D2
EY
EE
D1
T
T
X
X
X
R
P
Q
X
E
D2
EY
EE
D1
X
X
R
P
Q
X
E
D2
EY
EE
D1
T
XR
P
Q
X
E
D2
EY
EE
3. groups must consist of HRV-2B units only. Groups composed of mixed units of different types are not allowed
(eg 2nd gen. IDUs + HRV-2B).
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