1. 2013 CHIGO Product
CHIGO CMV
VRF Control System

2. VRF control system VRF system design principle
New CMV outdoor units control system
New CMV indoor units control system

3. VRF system design principle
VRF control system
VRF system design principle

4. VRF system design principle
Module design.
Indoor unit’s PCB(Printed Circuit Board) receives and collects the information from users (setting temperature, fan speed etc.) and environment (indoor coil temperature, indoor temperature etc.), and organize them to control the action of relevant parts such as EXV, then transmits them to outdoor master unit.
Outdoor master unit works out the best running parameters and sends the corresponding orders to slave outdoor units and indoor units.

5. VRF system design principle
Indoor fan speed
Swing fan
Water pump
Auxiliary heater
EXV opening degree
Display board
Water-level switch
temperature sensor
Compressor signal
temperature sensor
Pressure sensor
4-way valve signal
Outdoor fan speed
EXV opening degree
Function check
Digital pipe display
Power setting
Address setting
Indoor fan speed
Evaporator off
Indoor chips
Evaporator demand
EXV opening degree
Capacity adjustment
Outdoor fan speed
Protection
Compressor start
Mode control
Address setting
Function check
Outdoor chips
RS-485
Indoor signal
Outdoor signal

6. Temperature sensors definition
VRF system design principle
Temperature sensors definition
T1: Room temperature
T2: Temperature of middle evaporator
T2B: Temperature of evaporator outlet
T average: Mean value of T2B or T2
T3: Temperature of condenser outlet
T4: Ambient temperature
Ts: Setting temperature
T7: Discharge temperature of DC inverter compressor
T7C1: Discharge temperature of fixed compressor 1
T7C2: Discharge temperature of fixed compressor 2

7. New CMV outdoor units Control system
VRF control system
New CMV outdoor units
Control system

8. New CMV system 1.Control principle Indoor unit Module chip
Main chip
Indoor unit
Communication (RS-485)
Compressor current
Inverter module
Communication
Module chip
Order
Temperature sensor
LED display
Compressor
Outdoor fan
Solenoid valve
EXV
Protection
Capacity setting (ENC1)
Address setting (ENC2)
Forced cooling (SW1)
Function check (SW2)

9. New CMV system 2.Outdoor electrical box IPM modular Filter capacitor
Main PCB
Display tube 、Check button、Forcing cooling button
Communication terminal
Function Switch
Anti-lightning filter board
DC Fan Motor IPM
Power Supply terminal
Fixed Compressor Contractor

10. New CMV system 3. Key components ODU central controller& Ammeter
Fan drive 1
Fan drive 1
Hi Pressure
Low pressure
T3 T4 sensor
Hi pressure sensor
IDU COMM
ODU COMM
INV compressor & FIX compressor exhaust temp sensor
Module COMM
Transformer output
F1 F2 compressor & power & heater control terminal
3-phase power check
EXV control
SV1 SV2 SV3 SV4 control
SV5 SV6 & 4-way valve control
Transformer input
SV7 SV8 control

11. New CMV system 3. Key components Digital tube (LED display)
SW3: Forced
cooling button
SW4:Night time selection switch
SW5:Static pressure switch
SW9:Mode selection switch
SW8:Night noise control and automatically assign address switch
SW7:Start time switch
SW2: Function check button

12. New CMV system 3. Key components Address setting Address SW6
Master unit 1
Slave unit 2 3 ≥4
Invalid address, lead to system error 12

13. New CMV system 3. Key components Capacity setting SW11 Capacity Remark
8HP
This switch is set in factory, no change will need. 1
10HP 2
12HP 3
14HP 4
16HP ≥5
Invalid code
Capacity setting 13

14. SW3: Forced cooling button
New CMV system
3. Key components
SW3: Forced cooling button
SW3 14

15. New CMV system 3. Key components SW2 & LED display SW2
Displays the system operation parameters when the check button is pressed.
Displays the number of online indoor units when system is standby.
Displays the operation frequency of inverter compressor when it starts.
Displays ‘dF’ when system is running the defrost program.
Displays ‘d0’ when system is running the oil return program.
Displays the error code when system is malfunction or under protection. 15

16. System operation parameters
New CMV system
3. Key components
System operation parameters
Sequence
System operation parameters
Remarks
1st
This outdoor unit address
0, 1, 2, 3, 4
2nd
This outdoor unit capacity
8HP, 10HP, 12HP, 14HP, 16HP
3rd
Number of online outdoor units
Available for master unit only
4th
Total capacity of outdoor units
5th
Total capacity demand of indoor units
6th
Amended capacity demand for the master unit
7th
Running mode
0: OFF :COOLING
3: HEATING 4: FORCED COOLING
8th
Capacity output of this outdoor unit
Displays in %
9th
Fan speed
0,1,2,3,4,5,6,7,8,9
10th
Average temperature of evaporators T2/T2B
Actual value
11th
Temperature of condenser outlet T3 16

17. New CMV system 3. Key components Sequence System operation parameters
Remarks
12th
Ambient temperature T4
Actual value
13th
Discharge temperature of inverter compressor
14th
Discharge temperature of fixed compressor 1
15th
Discharge temperature of fixed compressor 2
16th
Current of inverter compressor
17th
Current of fixed compressor 1
18th
Current of fixed compressor 2
19th
Electric expansion valve opening degree
Actual value = Display value × 8
20th
Discharge gas pressure
Actual value = Display value × 0.1Mpa
21st
Secondary current
Actual valve
22st
Secondary voltage
Actual value x 40V
23nd
Running mode
0,1,2,3,4,5,6
24rd
No. of indoor units
25rd
Last fault code or protection code
No protection or fault display 00
26rd --
Spot inspection finished 17

18. New CMV system 3. Key components SW4 Night set Selection SW4
Night time selection is 6h/8h (default)
8h/10h
6h/12h
8h/8h 18

19. New CMV system 3. Key components SW5 Static pressure set Selection SW5
Static pressure mode is 0(default)
High ESP 19

20. New CMV system 3. Key components SW9 Mode set Selection SW9
Heating prior(default)
Cooling prior
Starting prior
Only respond to heating mode
Only respond to cooling mode 20

21. SW8 Night and address set
New CMV system
3. Key components
SW8
Selection
Night noise control and automatically address
Night noise control and manually address --
No night noise control and automatically address
No night noise control and manually address
SW8 Night and address set 21

22. New CMV system 3. Key components SW7 Time set Selection SW7
Starting time is set 12 minutes(default)
Starting time is set 3 minutes 22

23. New CMV system
3. Key components
SW10 SW12 SW13 are reserved.

24. New CMV system 3. Key components Error codes Code
Malfunction or Protection
Remark E0
Communication error between outdoor units
Only displays on slave units E1
Phase sequence error E2
Communication error between ODU and IDU
Only displays on master unit E4
Ambient temperature or pipe temperature sensor error E6
Condenser temperature sensor error E8
Outdoor unit address setting error H0
Communication between DSP and 0547error H1
Communication between 0547 and 0537error H2
Auxiliary outdoor unit decrease error H3
Auxiliary outdoor unit increase error H4
If P6 occurs 3 times in half an hour, it will display H4.
Need to cut off the power H5
If P2 occurs 3 times in half an hour, it will display H5. H6
If P4 occurs 3 times in 100 minutes, it will display H6.

25. New CMV system 3. Key components Error codes Code
Malfunction or Protection
Remark H7
Indoor unit decrease error
Until indoor quantity recover H8
Discharge pressure sensor error
Pc≤0.3MPa H9
If P9 occurs 3 times in half an hour, it will display H9.
Need to cut off the power P1
High pressure protection P2
Low pressure protection P3
Inverter overcurrent protection P4
Discharge temperature protection P5
Pipe temperature protection P6
Inverter Module protection P7
Fixed compressor 1 overcurrent protection P8
Fixed compressor 2 overcurrent protection P9
DC fan module board protection

26. New CMV system 3. Key components Error codes Code
Malfunction or Protection
Remark L0
Inverter module protection
After P6 displaying for 60s, they will display L1
DC supply wire low voltage protection L2
DC supply wire high voltage protection L4
MCE failure L5
Zero velocity protection L7
Phase sequence protection L8
Frequency protection L9

27. New CMV Indoor units Control system
VRF control system
New CMV Indoor units
Control system
Let’s go to indoor unit aspect.

28. Indoor units 1.Control principle Outdoor unit MCU EEPROM
Communication (RS-485)
Central Controller
MCU
Controller signal
Temperature sensor
Capacity setting
LED display
LED lights
Fan speed
EXV
Water pump
Swing motor
Address setting
EEPROM
*EEPROM (E2PROM): Electrically Erasable Programmable Read-Only Memory
Read

29. Ceiling floor&4-way cassette
Indoor units
2. Indoor units PCB
Wall-mounted
Wall-mounted
Ceiling floor&4-way cassette
Ducted

30. Indoor units 2. Indoor units PCB 220V AC N port Transformer input port
Fan motor output port
Transformer output port
220V AC L port
Temperature sensor port
Communicate port of P Q E
Download port
EXV port
Remote control port
Display board terminal

31. Indoor units 3. Key component SW1 Switch Function SW1
By dialing code switch SW1 you can set the indoor unit horsepower (Factory setting)
SW1

32. Indoor units 3. Key component SW2
Switch
Function
SW2
Third bit and fourth bit select temperature compensation value
Fifth bit and sixth bit select anti-cold temperature value
Seventh bit and eighth bit select time value in TERMAL program

33. SW2:Third bit and fourth bit
Indoor units
3. Key component
SW2:Third bit and fourth bit
Switch
Function
SW2
select temperature compensation value .

34. SW2:Fifth bit and sixth bit
Indoor units
3. Key component
SW2:Fifth bit and sixth bit
Switch
Function
SW2
select anti-cold temperature value

35. SW2:Seventh bit and eighth bit
Indoor units
3. Key component
SW2:Seventh bit and eighth bit
Switch
Function
SW2
select time value in TERMAL program .

36. Indoor units 3. Key component SW3
Switch
Function
SW3
First bit select auto-restart function
Fourth bit select addressing mode

37. Indoor units 4. Display board
Duct/Ceiling floor/Cassette type indoor units
Protection lamp
Timer lamp
Defrost lamp
Run lamp
Manual Button
Buzzer
Infrared receiver

38. Indoor units 4. Display board
Duct/Ceiling floor/Cassette type indoor units
Reset power, run lamp flash slowly; In standby, all the lamps off; Units running, run lamp on; Anti-cold or defrost, defrost lamp on; Timer function, timer lamp on.
Indoor unit malfunction will show on display board
Lamp
Meaning
Timer and run lamp flash slowly
The first time power on, no address in the indoor units
Timer lamp flash quickly
Communicate fault between indoor and outdoor unit
Run lamp flash quickly
Indoor temperature sensor protection
Protection lamp flash quickly
Water level protection
Defrost lamp flash quickly
Mode conflict
Protection lamp flash slowly
Outdoor protection
Defrost lamp flash slowly
EEPROM protection
Remark: Flash slowly: 2 seconds for one cycle. Flash quickly: 0.4 second for one cycle.

39. Indoor units 4. Display board
Duct/Ceiling floor/Cassette type indoor units
Manual button
Press the button for 5 seconds, the lamps show the indoor unit’s address.
Press the button for 10 seconds, the lamps show the indoor unit’s capacity.
Address:
Indoor unit address
LED lights
Buzzer no ring On
Flash
Buzzer rings
Remark:
Run lamp:8 Defrost lamp:4 Timer lamp:2 Protection lamp:1

40. Indoor units 4. Display board Wall mounted indoor units
Infrared receiver
Digital display
Defrost lamp
Timer lamp
Run lamp

41. Indoor units 4. Display board Wall mounted indoor units
Check procedure 1 2 3 4 5 6 7 8 9 10
Normal
Address HP
Net address Ts T1 一一 T2
T2b
Error Code
In standby, digital display “--”, run lamp flash slowly; Turn off, digital display “--”, run lamp off; Turn on, run lamp on, in cooling/heating mode, digital display setting temperature, in fan mode, digital display indoor temperature; In defrosting , defrost lamp on; In timer, timer lamp on.

42. Indoor units 4. Display board
Indoor unit malfunction will show on digital display
Code
Operation status FE
The first time power on, no address in the indoor units E0
Phase error or phase lose protection E1
Communication malfunction between indoor and outdoor unit E2
Room temperature (T1) sensor malfunction E3
Middle evaporator temperature (T2) sensor malfunction E4
Evaporator outlet temperature (T2B) sensor malfunction E5
Outdoor protection E6
Zero-crossing protection E7
EEPROM malfunction E8
PG fan malfunction E9
Communication malfunction between wire controller and units EE
Water level malfunction EF
Mode conflict

43. Thank you!