GCHV GCHV-E252W/ZR1 User manual

Full DC Inverter CHV System
Control System
Technical Support Division
2020-11-21
GD CHIGO HEATING & VENTILATION EQUIPMENT CO., LTD.

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GD CHIGO HEATING & VENTILATION EQUIPMENT CO., LTD.
Full DC Inverter CHV System - Control System
1. Outdoor Unit PCB
2. Communication System
3. Controllers
Content

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GD CHIGO HEATING & VENTILATION EQUIPMENT CO., LTD.
Full DC Inverter CHV System - Control System
1. Outdoor unit PCB
1.1 Outdoor unit PCB outlook
No
Content
No
Content
1
Module board communication port
17
Port for communication between ODUs
2
Input port for system high pressure
18
Output port for fan motor relay
3
Input port for ambient temperature
19
Output port for EXV1 and EXV2
4
Input port for condenser coil temperature
20
Output port for EXV3 and EXV4
5
Port to detect the primary side current of compressors
21
Port for electric heater of compressor A
6
Input port for signal of low-pressure switch
22
Port for electric heater of compressor A
7
Input port for signal of high-pressure switch
23
Output port for solenoid valves
8
Control port of DC fan (left fan and single fan use port 1)
24
Output port for 4-way valve
9
Port for network control and ammeter billing
25
Output port for AC fan motor
10
Port for IDU and ODU communication and IDU network
wiring
26
Reserved
11
Input port for exhaust temperature sensor of compressor
27
Power input port of main PCB
12
Input port for refrigerant cooling copper pipe temperature
sensor
28
Port for program download (0547)
13
Input port for system low pressure (reserved)
29
Input port for PassDog
14
Input port for oil temperature sensor (reserved)
30
GND
15
Port for outlet temperature sensor of plate heat exchanger
31
Port for program download (0537)

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Full DC Inverter CHV System - Control System
16
Port for inlet temperature sensor of plate heat exchanger
32
/
1.2 Dial codes definition
SW4
Parameter setting for night time silent operation
Meaning
After 6 hours of daytime
peak temperature, night
time silent operation start,
last for 10 hours, then
return to normal operation.
After 8 hours of daytime
peak temperature, night
time silent operation start,
last for 10 hours, then
return to normal operation.
After 6 hours of daytime
peak temperature, night
time silent operation start,
last for 12 hours, then
return to normal operation.
After 8 hours of daytime
peak temperature, night
time silent operation start,
last for 8 hours, then return
to normal operation.
Demonstration
(Default setting)
Remarks
⚫It is available only when user turn on the night time silent operation mode in SW8.
⚫Night time silent operation mode is default ON.

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GD CHIGO HEATING & VENTILATION EQUIPMENT CO., LTD.
Full DC Inverter CHV System - Control System
SW5
Outdoor fan ESP setting
Meaning
Standard
static
pressure
Low static
pressure
Middle
static
pressure
High static
pressure
Super-high
static
pressure
Silence
High-
silence
Ultra-silence
Demonstration
(Default
setting)
SW6
Outdoor unit address setting
Meaning
Master unit
Slave unit 1
Slave unit 2
Slave unit 3
Demonstration
Poniting to 0
Poniting to1
Poniting to 2
Poniting to 3
Remarks
Only 0,1,2,3 is available, address bigger than 3 will cause system failure.
SW7
1. System first start time setting
2. Snow-blowing function: when outdoor temperature is lower than 0°C and system is standby, every one hour
outdoor fan motor will turn on for 30 seconds.
Meaning
1. System can be start
only after power on
for 12 minutes.
2. Snow-blowing
function is OFF.
1. System can be start
only after power on
for 7 minutes.
2. Snow-blowing
function is OFF.
1. System can be start
only after power on
for 12 minutes.
2. Snow-blowing
function is ON.
1. System can be start
only after power on
for 7 minutes.
2. Snow-blowing
function is ON.
Demonstration
1 2
ON
(Default setting)
1 2
ON
1 2
ON
1 2
ON
Remarks
DO NOT change this setting without professional guidance.
SW8
Turn ON or OFF night time silent operation mode and automatically addressing
Meaning
1. Night time
silent operation
mode is ON
2. Automatically
addressing is
ON.
1. Night time
silent operation
mode is ON.
2. Automatically
addressing is
OFF.
——
1. Night time
silent operation
mode is OFF.
2. Automatically
addressing is
ON.
1. Night time
silent operation
mode is OFF.
2. Automatically
addressing is
OFF.

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Full DC Inverter CHV System - Control System
Demonstration
(Default setting)
Remarks
When automatically addressing is OFF, user need to set indoor unit address manually by wired controller.
SW9
Operation mode restriction setting
Meaning
Auto priority
Heating priority
Cooling priority
Heating only
Cooling only
VIP priority and
Auto priority
Demonstration
(Default setting)
Remarks
Address No.63 indoor unit is VIP unit.
SW11
Outdoor unit Capacity setting
Meaning
8HP
10HP
12HP
14HP
16HP
18HP
20HP
22HP
Point to 0
Point to 1
Point to 2
Point to 3
Point to 4
Point to 5
Point to 6
Point to 7
SW2: Forced cooling button
1) After pressing it once, all indoor units and outdoor units will start cooling, no matter what mode they are running on, no matter
whether they are ON or OFF.
2) The forced cooling function is available for master unit only.
3) During forced cooling mode.
⚫All indoor EXVs open to 300 pulses.
⚫All indoor fans are in high speed.
⚫All compressors are ON.
⚫All outdoor fan motors are OFF
⚫Outdoor EXVs opens to 480 pulses
⚫SV6 is ON
4) When program starts:
⚫All the compressors are on
⚫Indoor fan is running at high speed
5) When the process is last for 1h or the button is pressed again, program will quit.

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Full DC Inverter CHV System - Control System
1.3 Spot check parameters
No.
Content
Remarks
/
Quantity of indoor units which can be
communication with outdoor unit
Displays when system standby
/
Inverter compressor frequency
Displays when system is running
1
Outdoor unit’s address
0(master unit), 1(slave unit 1), 2(slave unit 2), 3(slave unit3)
2
Outdoor unit capacity
0~F, (according to SW11)
3
Online outdoor unit quantity
Only available for master unit
4
All outdoor units total capacity
Total HP
5
Quantity of outdoor units in operation
Only available for master unit
6
Total capacity of outdoor unit in operation
Master and slaver unit display
7
Maximum quantity of online indoor units
Maximum quantity of IDUs communicated with ODU ever
8
Current quantity of online indoor units
Quantity of IDUs communicated with ODU now
9
Quantity of indoor units in operation
10
Operation mode
0 (OFF or Fan only) 2 (Cooling) 3 (Heating) 4 (Forced cooling)
11
Total capacity demand of indoor units
Only available for master unit
12
Total amended capacity demand of indoor
units
Only available for master unit
13
Outdoor unit actual capacity output
Actual output HP
14
Low pressure value
Actual value=Display value*0.1 (MPa)
15
High pressure value
Actual value=Display value*0.1 (MPa)
16
Outdoor fan speed range
0-36
17
Average temperature of T2/T2B (indoor
evaporator)
Display in actual value (℃)
18
T3 (outdoor condenser outlet temperature)
Display in actual value (℃)
19
T4 (ambient temperature)
Display in actual value (℃)
20
Reserved
21
Inlet temperature (T6A) of plate heat
exchanger
Display in actual value (℃)
22
Outlet temperature (T6A) of plate heat
exchanger
Display in actual value (℃)
23
Discharge temperature of inverter
compressor A
Display in actual value (℃)
24
Discharge temperature of inverter
compressor B
Display in actual value (℃)
25
T8
Display in actual value (℃)
26
Temperature of IPM A
Display in actual value (℃)
27
Temperature of IPM B
Display in actual value (℃)
28
Superheat degree of compressor
Display in actual value (℃)
29
Opening degree of main EXV A
Actual value=Display value*8
30
Opening degree of auxiliary EXV C
Actual value=Display value*8
31
Auxiliary EXV adjustment range
0-OFF; 1-minimum opening degree; 2-auto adjust
32
Current of inverter compressor A
Display in actual value (A)
33
Current of inverter compressor B
Display in actual value (A)

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Full DC Inverter CHV System - Control System
34
Secondary side current of inverter
compressor A
Display in actual value (A)
35
Secondary side current of inverter
compressor B
Display in actual value (A)
36
AC voltage
Actual value (V)
37
DC bus line voltage of compressor A
Actual value=Display value*4 (V)
38
DC bus line voltage of compressor B
Actual value=Display value*4 (V)
39
Priority mode
0-Auto priority; 1-Heating priority;
2-Cooling priority; 3-Heating only;
4-Cooling only; 5-VIP priority and auto priority
40
Silence mode
0-standard mode; 1-silence mode 1;
2-silence mode 2; 3-silence mode 3;
4-Night silence mode
41
Static pressure mode
0-standard mode; 1-low static pressure;
2-medium static pressure; 3-High static pressure
4-super-high static pressure
42
VIP indoor unit address
43
Refrigerant status
0-Normal; 1-Slightly excess; 2-Overmuch;
11-Slightly insufficient; 12-Insufficient; 13-Extremely insufficient
44
T2B target value A (for cooling mode)
5~15, 8 is factory default value
45
T2 target value B (for heating mode)
40~50, 44 is factory default value
46
Power saving value
0-100%; 1-90%; 2-80%; 3:70%
4-60%; 5-50%; 6-40%
47
Longest defrosting time
5~20min, 10 min is factory default
48
T3 for exiting defrosting
10~18, 15℃is factory default
49
Allowed indoor unit offline time
Actual value (min), 60~480
50
Allowed quantity of offline indoor unit
Actual value, 0~6
51
Reserved
52
T2 correction value
0-No correction; 4-Quantity of unit correction;
5-Quantity and (T2B+3) correction;
6- Quantity and (T2B-3) correction
53~54
Reserved
55
Drive code of compressor A
1-AA55 compressor; 6-DC60 compressor; 7-DD98compressor.
56
Drive code of compressor B
1-AA55 compressor; 6-DC60 compressor; 7-DD98compressor.
57
Frequency limit of compressor A
0-No limit; 1-T4 limit; 2-Pressure limit; 3-Voltage limit;
4-Discharge limit; 5-Current limit; 6-P6 limit;
7-Module temperature limit.
58
Frequency limit of compressor B
0-No limit; 1-T4 limit; 2-Pressure limit; 3-Voltage limit;
4-Discharge limit; 5-Current limit; 6-P6 limit;
7-Module temperature limit.
59
Reserved
60
Last error code
If no error code, it shows 00.

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Full DC Inverter CHV System - Control System
1.4 Outdoor unit error code table
Code
Malfunction or protection
remark
E0
Outdoor unit communication malfunction
Only slaver unit displays
E1
Phase sequence malfunction
E2
Communication between master outdoor unit and indoor units
E3
Discharge temperature sensor fault
E4
Ambient temperature sensor malfunction
E5
T6A temperature sensor fault
E6
Outdoor heat exchanger temperature sensor malfunction
E7
T6B temperature sensor fault
E8
Outdoor unit address incorrect
E9
AC voltage protection
EA
Refrigerant cooling temperature sensor fault
XH0
Communication malfunction between main PCB and IPM board
H1
Communication malfunction between 0537 and 0547 in main PCB
H2
Outdoor unit quantities decreasing malfunction
Only master unit displays
H3
Outdoor unit quantities increasing malfunction
Only master unit displays
XH4
There is 3 times P6 protection in 60 minutes.
Repower on to clear the error code.
H5
There is 3 times P2 protection in 60 minutes.
Repower on to clear the error code.
H6
There is 3 times P4 protection in 100 minutes.
Repower on to clear the error code.
H7
Indoor unit quantities decreasing malfunction over 3 minutes
Recover when indoor unit quantity is correct
H8
Discharge pressure sensor error
When discharge pressure is lower than 0.3MPa
XH9
There is 3 times P9 protection in 30 minutes.
Repower on to clear the error code.
P1
High pressure protection
High pressure switch disconnected, discharge
thermostat disconnected, high pressure is higher
than
P2
Low pressure protection
XP3
Inverter compressor over current protection
AC side overcurrent
XP4
High discharge temperature protection
P5
High T3 temperature protection
XP6
Inverter module protection
P7
Insufficient superheat protection
XP8
Capacity switch is no match with compressor
P9
DC Fan module protection
PA----
Prompt for entering password
XPA
High temperature of module protection
XL0
DC compressor module fault
Error code after P6 protection
XL1
DC bus low voltage protection
XL2
DC bus high voltage protection
XL4
MCE malfunction/simultaneously/cycle loop
XL5
Zero speed protection

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Full DC Inverter CHV System - Control System
XL7
Fault or protect definition
XL8
A moment before and after the speed change >15Hz
XL9
Set speed and the actual speed difference >15Hz
Note: X stands for which system, 1 is system A, 2 is system B.
1.5 Some parameters setting
1. Historical error code query
Press 'CHECK_A' or 'CHECK_B' button to item 60, this is the recent error code:
Long press 'COOL' button for 3s, enter historical fault query.
Press 'CHECK_A' or 'CHECK_B' to switch the fault number, 'N1.' indicates the second to last fault; 'N2.' indicates
the third last fault, and so on. 'N63.' is the last fault, up to 64 historical faults can be stored, and historical faults can
be saved even after power failure.
After entering the fault record query, if without any operation within 20s, it automatically returns back to the
frequency display or standby display.
2. parameter settings at project site
In normal display state, long press 'COOL' button for 3s, enter parameter setting function: SHx is displayed ('x'
means number), short press 'COOL' button to switch the parameter items, such as from SH1-> SH2-> SH3...
Each parameter item can be changed by pressing 'CHECK_A' or 'CHECK_B' button. After setting parameter, if
there is no operation within 10s, the setting will be saved automatically. After 20s without any operations, it will
automatically return to the frequency display or standby display.
SH1: Cooling T2B target value A (unit: ℃, range: 5-15), the factory default is 8 ℃;
SH2: Heating T2 target value B (unit: ℃, range: 40-50), the factory default is 44 ℃;
SH3: Power saving mode value C (range: 40-100), it means that the outdoor unit can output 40%, 50%, 60%, 70%,
80%, 90%, 100%, and the factory default is 100%;
SH4: Auto charging refrigerant function (range: 0&1), the factory default is 0, there is no auto charging refrigerant
function. SV10 valve is always closed. '1' means there is auto charging refrigerant function, SV10 valve can be
turned on or off according to the relevant date judgment. This parameter will turn to '0' if powered off, which means
this function is no power off memory function.
SH5: The Longest defrosting period (unit: min, range: 5-20), the factory default is 10 minutes.
SH6: Exit defrost temperature T3 value, (unit: ° C, range: 10-18), the factory default is 15 ° C;
SH7: Allowed indoor unit offline time value, (unit: min, range: 60-480), you can choose from 8 values of 60, 120,
180, 240, 300, 360, 420, 480. The factory default is 60 minutes;
SH8: Allowed indoor unit offline quantity value, (unit: pcs, range: 0-6), the factory default is 2;
SH9: Reserved.
3. Forced cooling
Short Press 'COOL' button to enter forced cooling mode. ‘dC' is displayed.
Short Press 'COOL' button again to exit forced cooling to standby mode.
Forced cooling will automatically exit after 1 hour.

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Full DC Inverter CHV System - Control System
1.1 Electric wiring installations
1.3.1 Highlights of electrical installation
1) Please separately design the special power of indoor units and outdoor units.
2) The power adopts special circuit, and installs circuit breaker and manual switch.
3) The indoor units’ power, circuit breaker and manual switch connecting to the same outdoor unit must be general. All indoor units
must be the same circuit, and must simultaneously on or off; otherwise, system life will seriously effect, and appear the situation
not to solve.
4) The communication line between indoor units and outdoor units please use 2-core shielded wiring, while don’t use the multi core
wiring without shielded affect, for the interference is reduced each other
5) Purchased wiring, parts and materials should be in compliance with the local and national regulations.
6) All field wiring construction should be finished by qualified electrician.
7) Air conditioning equipment should be grounded according to the relevant local and national electrical regulations.
8) Current leakage protection switch should be installed (select current leakage breaker in light of the 1.5-2 times of total loading
rated current.)
9) When connecting wiring and wire holder, use cable clamp to fix and make sure no exposure.
10) Refrigerant piping system and wiring system of indoor and outdoor unit belongs to the different system.
11) Do not connect the power wire to the terminal of signal wire.
12) When power wire is parallel with signal wire, put wires to their own wire tube and remain proper gap (the current capacity of
power wire is: 10A below 300mm, 50A below 500mm).
13) Voltage discrepancy of power wire terminal (side of power transformer) and end voltage (side of unit) should be less than 2%. If
its length could not be shortened, thicken the power wire. Voltage discrepancy between phases shall not pass 2% rated value and
Current discrepancy between highest and lowest phase should be less than 3% rated value.
1.3.2 Selection of wiring
1.3.2.1 The selection of wiring area shall in accordance with the requirements below:
1) Voltage lose of wire shall meet the requirement of terminal voltage for normal operation and startup.
2) The wiring current-carrying capacity determined by installed method and environment is not less than the largest current of unit.
3) Conductor shall ensure the stability of movement and heating.
4) The conductor’s smallest sectional area should satisfy the requirement of mechanical strength.
5) When earth protection line (shortly called PE line) is made of material the same as phase line, the smallest sectional area of PE
line should be in accordance with the regulation below:
Sectional area of core to phase line (mm²)
Smallest sectional area of PE line(mm²)
S≤16
S
16＜S≤35
16
S＞35
S/2
1.3.2.2 Distribution highlights of distribution wiring
1) When distributing wiring, select wirings with different colors for phase line, zero line and protection earth according to relevant
regulations.
2) The power wire and control wire of concealed engineering is prohibited to bind together with refrigerant piping. It is necessary to
pass through wire tube and be distributed separately, and the gap between control line and power wire should be 500mm at least.
3) When distributing wiring by passing through pipe, the following should be paid attention to:
⚫Metal wire tube could be used in indoor and outdoor, but it is not suitable to the place with acid –alkali corrosion.
⚫Plastic wire tube is generally used in indoor and place with corrosion, but it is not suitable to situation with
mechanical damage.
⚫The wiring through pipe shall not be in the form with ends jointing. If there must be joint, connection box should be

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Full DC Inverter CHV System - Control System
installed at the corresponding place.
⚫The wiring with different voltage should not pass through the same wire tube.
⚫Total sectional area of wiring through wire tube shall not exceed 40% valid area of stuffing tube.
⚫Fixing point of wire tube support shall follow the standard below:
Normal diameter of wire tube
(Mm)
Largest gap between fixed points of wire tube
Metal pipe
Plastic pipe
15~20
1.5m
1m
25~32
2m
1.5m
40~50
2.5m
2m
1.3.2.3 Outdoor unit power wiring selection
1) Separate Power Supply without power facility.
Model
Power supply
The shortest wiring diameter (mm2)
Manual switch (A)
Circuit breaker
≤20m
≤50m
GND
Capacity
Fuse
GCHV-E252W/ZR1
380-415V
3 Phase
50Hz
4×6
4×10
6
32
32
<100mA, 0.1sec
GCHV-E280W/ZR1
4×6
4×10
6
32
32
<100mA, 0.1sec
GCHV-E335W/ZR1
4×6
4×10
10
50
40
<100mA, 0.1sec
GCHV-E400W/ZR1
4×10
4×16
10
63
60
<100mA, 0.1sec
GCHV-E450W/ZR1
4×10
4×16
10
63
60
<100mA, 0.1sec
GCHV-E500W/ZR1
4×16
4×25
16
80
80
<100mA, 0.1sec
GCHV-E560W/ZR1
4×16
4×25
16
100
100
<100mA, 0.1sec
GCHV-E615W/ZR1
4×16
4×25
16
100
100
<100mA, 0.1sec
Note: The length in the table equals the value of power cord connecting outdoor units, indicating the condition that the voltage
dropping range is within 2%. If the length exceeds the above figure, please select the wire diameter according to relevant standard.
2) With power facilities:
a) Case 1:

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Full DC Inverter CHV System - Control System
b) Case 2:
Note:
⚫Select power wire for these five models separately according to relevant standard.
⚫The wiring diameter and the length in the table indicate the condition that the voltage dropping range is within 2%. If
the length exceeds the above figure, please select the wire diameter according to relevant standard.
3) Power wire selection
Power wiring includes the main wire (a) connecting to branch box and the wire (b) between branch box and power facilities.
Please select the wire diameter according to the following requirement.
a) Diameter of main wire (a): depends on the total horse power (HP) of outdoor unit (See (5)).
Example:
In system: 8HP×1 unit+8HP×1 unit+10HP×1 unit
So totally 26HP → See (5) → size of wire is 25mm2 (within 20m)
b) Diameter of wire (b): depends on the number of combined outdoor unit.
If outdoor unit quantity ≤ 5, the wire (b) diameter selection is same as main wire (a) selection (See (5)).
Outdoor unit
power supply Leakage
protector Manual
switch
Outdoor unit
Outdoor unit
Outdoor unit
Outdoor unit
GND
GND
GND
GND
Branch box
Leakage
protector
Manual
switch
380-415V 3N~ 50Hz
(a)
Leakage
protector
Manual
switch
GND
Branch box
Outdoorunit
GND
Outdoorunit
GND
Outdoorunit
GND
Outdoorunit
GND
Outdoorunit
GND
Outdoorunit
(b)
(a)
Power facilities1
(withleakageprotector)
Powerfacilities2
(withleakageprotector)

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Full DC Inverter CHV System - Control System
If outdoor unit quantity > 5, there will be 2 electric control boxes, the wire (b) diameter selection depends on the total
horse power (HP) of outdoor units connecting to each electric control box (See (5)).
4) Select the capacity of manual switch and fuse of the branch box depends on the total horsepower (HP).
Total capacity(HP)
Manual switch(A)
Fuse(A)
Total capacity(HP)
Manual switch(A)
Fuse(A)
8-10
32
32
36-40
150
120
12
50
40
42-44
200
150
14-16
63
60
46-50
200
175
18
80
80
52-60
200
200
20-22
100
100
62-72
250
250
24-28
100
100
74-76
250
250
30-34
100
100
78-88
400
310
5) Reference table of the cable size for each capacity
Total
capacity
(HP)
Minimum wire diameter (mm2)
Total
capacity
(HP)
Minimum wire diameter (mm2)
Wire length ≤ 20m
20m<Wire length≤ 50m
Wire length ≤ 20m
20m<Wire length≤ 50m
8
6
10
44
50
70
10
6
10
46
50
70
12
6
10
48
50
70
14
10
16
50
70
95
16
10
16
52
70
95
18
16
25
54
70
95
20
16
25
56
70
95
22
16
25
58
95
120
24
25
35
60
95
120
26
25
35
62
95
120
28
25
35
64
95
120
30
35
50
66
95
120
32
35
50
68
95
120
34
35
50
70
120
150
36
35
50
72
120
150
38
35
50
74-76
150
185
40
35
50
78-88
185
240
42
50
70
Remark:
⚫The above selection is for reference.
⚫For an actual electrical project, it should be considered that the cable layout, space between cable and surroundings, etc.
1.5.5 Indoor unit power wiring selection

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Full DC Inverter CHV System - Control System
Note:
⚫Set refrigerant piping system, signal wires between indoor-indoor unit, and that between outdoor-outdoor units into one system.
⚫Please do not put the signal wire and power wire in the same wire tube; keep distance between the two tubes. (Current capacity
of power supply: less than 10A--300mm, less than 50A--500mm.)
⚫Make sure to set address of outdoor unit in case of parallel multi-outdoor units.

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Full DC Inverter CHV System - Control System
2. Communication system
2.1 Control system introduction
2.1.1 Connecting highlights of control line (RS-485 communication)
1. The control line should be shielded wire (wire diameter of the core wire≥0.75 mm2). Using other wiring shall create signal
interference, thus leading to error operation.
2. The shielded nets at the two sides of shielded wires are either grounded to the earth, or connected with each other and jointed to
the sheet metal along to the earth.
3. Control wire could not be bound together with refrigerant pipeline and power wire. When power wire and control wire is
distributed in parallel form, keep gap between them above 300mm so as to preventing signal interference.
4. Control wire could not form closed loop.
5. Control wire has polarity, so be careful when connecting.
2.1.2 Selection of control wire specification
The ordinary shielded wire includes:
Model
Name
AVP
Copper core PVC insulation shielded wire
AVP-105
Heat-resistant 105˚C PVC insulation shielded wire
RVP
PVC insulation shielded flexible wire
RVP-105
Heat-resistant 105˚C PVC insulation shielded flexible wire
RVVP
PVC insulation shielded PVC sheath flexible wire
RVVP1
PVC insulation entangled shielded PVC sheath flexible wire
2.1.3 Signal wire of indoor/outdoor units

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GD CHIGO HEATING & VENTILATION EQUIPMENT CO., LTD.
Full DC Inverter CHV System - Control System
Signal line shall adopt 2-core shielded wire with an area above
0.75 mm2, the 2 cores are connected to P, Q or H1,H2 terminals,
the shielded layer are connected to E terminals.

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GD CHIGO HEATING & VENTILATION EQUIPMENT CO., LTD.
Full DC Inverter CHV System - Control System
L1 L2 L3 N
A B C N H1 H2 E P QEA B C N A B C NH1 H2 E P QEH1 H2 E P QE
L N PQ E L N PQ E L N PQ E
Main power Supply (380V~415V/3PH/50Hz)
L1 L2 L3 N
Outdoor unit (Master) Outdoor unit (Slave) Outdoor unit (Slave)
Indoor unit Indoor unit Indoor unit
Sheilded layer
Power
distributor
Communication wired between outdoor units
Communication wired between outdoor units
Sheilded layer
Indoor unit power cable
Outdoor unit power cable
Power distributor Power distributor Power distributor
Note:
⚫The signal connecting line between outdoor units, indoor and outdoor units and indoor units has polarity. When connecting, be
careful to prevent error connection.
⚫Signal line shall adopt 2-core shielded wire with an area above 0.75 mm2, the 2 cores are connected to P,Q or H1,H2 terminals,
the shielded layer are connected to E terminals.
⚫Do not bind signal line and copper pipe together with belting.
⚫Make sure that the shield metal layer should be grounded well indoor control box in order to prevent interference.
⚫it’s forbidden to connect 200V or above high-volt live wire to the communication terminal.

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GD CHIGO HEATING & VENTILATION EQUIPMENT CO., LTD.
Full DC Inverter CHV System - Control System
2.1.4 Correct connection
Note: Shielded layer should be connected to steel pane of electrical control box.
2.1.5 Typical wrong connection
1) Loop connection of signal wire
2) Star connection of signal wire
a) Star connection of part signal wires
b) Star connection of all signal wires

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GD CHIGO HEATING & VENTILATION EQUIPMENT CO., LTD.
Full DC Inverter CHV System - Control System
3) Reverse connection of signal wire
a) Outdoor unit to indoor unit
b) Indoor unit to indoor unit