Gree CE52-24/F(C) User manual

Owner's Manual
Original Instructions
Commercial Air Conditioners
Centralized Controller
Model:
CE52-24/F(C)

To Users
Thank you for selecting Gree product. Please read this instruction manual
carefully before installing and using the product, so as to master and correctly use
the product. In order to guide you to correctly install and use our product and
achieve expected operating effect, we hereby instruct as below:
(1) This appliance is not intended for use by persons (including children) with
reduced physical, sensory or mental capabilities, or lack of experience and
knowledge, unless they have been given supervision or instruction
concerning use of the appliance by a person responsibility for their safety.
Children should be supervised to ensure that they do not play with the
appliance.
(2) This instruction manual is a universal manual, some functions are only
applicable to particular product. All the illustrations and information in the
instruction manual are only for reference, and control interface should be
subject to actual operation.
(3) All the illustrations and information in the instruction manual are only for
reference. In order to make the product better, we will continuously
conduct improvement and innovation. If there is adjustment in the product,
please subject to actual product.
(4) If the product needs to be installed, moved or maintained, please contact
our designated dealer or local service center for professional support.
Users should not disassemble or maintain the unit by themselves,
otherwise it may cause relative damage, and our company will bear no
responsibilities.

Contents
1 Safety Notices (Please be sure to abide).........................1
2 User Notice.........................................................................1
3 Installation..........................................................................2
3.1 Installation Requirements .......................................................3
3.2 Wiring Instructions ..................................................................5
3.3 Installation Procedure...........................................................14
3.4 Removal Procedure ..............................................................16
4 Display and Working Instructions..................................16
4.1 Main Page Display and Buttons............................................17
4.2 General Buttons....................................................................18
4.3 Buttons Working Instructions ................................................19
5 Functions Description.....................................................21
5.1 Help Info................................................................................21
5.2 VRF Unit ...............................................................................21
5.3 Single Unit Control................................................................22
5.4 Water/Floor Control...............................................................25
5.5 Fresh Air Control...................................................................30
5.6 All-Control Function...............................................................32
5.7 Group Control .......................................................................34
5.8 Schedule Management.........................................................35
5.9 L-CAC&Split Unit ..................................................................38
5.10 Local Setting.......................................................................42
5.11 Engineering Setting.............................................................44
5.12 About...................................................................................46

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1 Safety Notices (Please be sure to abide)
WARNING:If not abide them strictly, it may cause severe damage to the
unit or the people.
NOTE:If not abide them strictly, it may cause slight or medium damage to
the unit or the people.
This sign indicates that the items must be prohibited. Improper operation
may cause severe damage or death to people.
This sign indicates that the items must be observed. Improper operation
may cause damage to people or property.
WARNING!
This product can’t be installed at corrosive, inflammable or explosive environment
or the place with special requirements, such as kitchen. Otherwise, it will affect the
normal operation or shorten the service life of the unit, or even cause fire hazard or
serious injury. As for the above special places, please adopt special air conditioner
with anti-corrosive or anti-explosion function.
2 User Notice
All indoor units must be supplied with unified power.
Make sure communication cord is connected with the proper port, otherwise
there may occur communication malfunction.
Never knock on, throw or frequently detach the centralized controller.
Never operate the centralized controller with wet hands.
Never scratch the screen of centralized controller by hard or sharp objects.
If the centralized controller is connected with the outdoor network or the last
indoor unit of the indoor network, then a matching resistance must be
connected between G1 and G2 ports.
the centralized controller Connect with L-CAC&Split unit, The indoor unit
address must be set within the range from 1 to 36, communication way of
L-CAC&Split unit set long distance monitoring mode.

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3 Installation
Fig.3.1 Parts of Centralized Controller
No. ①②③④
Name Touch
screen
Self-tapping screw
ST4.2×9.5 MC(used to
secure the rear cover of
controller)
Rear cover of
controller Rubber band
QTY
1
4
1
6
No. ⑤⑥⑦⑧
Name
Screw
M4×12
(used to
secure
earthing
wire)
Screw ST4.2×16 FA
(used to secure electric
box cover)
Electric box
cover Matching resistance
QTY
1
4
1
2

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Unit:mm
Fig.3.2 Dimension of Centralized Controller
Unit:mm
Fig.3.3 Dimension of Electric Box Cover
3.1 Installation Requirements
(1) Communication cord of the centralized controller and Multi-VRF (CAN
Network) must be selected according to the table below. Never use the
cable that is not in compliance with instructions of this manual.

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Network
Cord
type
Cord
standard
Cord size
(mm
2
/AWG)
Total length
L(m/feet)
Remark
Indoor
network
Light/
Ordinary
polyvinyl
chloride
sheathe
d cord.
(60227
IEC 52
/60227
IEC 53)
IEC
60227-
5:2007
2×0.75~
2×1.25 (2×
AWG18~2×
AWG16)
L≤1000m
(L≤3280-5/6
feet)
If cord size is 2×
1mm2(2×AWG16),
communication cord
can be stretched
longer. But the total
length can’t exceed
1500m(4921-1/4feet).
Outdoor
network
L≤500
(L≤820-1/5f
eet)
Total length of
communication cord
can’t exceed
500m(820-1/5feet).
NOTICE:
①The cord shall be Circular cord (the cores shall be twisted together).
②If unit is installed in places with intense magnetic field or strong interference, it
is necessary to use shielded wire.
(2) Communication cord of the centralized controller and L-CAC&Split Unit
(Modbus net) must be selected according to the table below.
Cord type Cord size (mm2) Cord standard Note
Two_core
five twisted
pair 24AWG(2×0.6mm)
TIA/EIA-568-A
When the
communication
distance exceeds
800m,the need to
increase the
photoelectric
isolation repeter
(3) Never install the centralized controller in the following places:
1) Places with corrosive gas or serious dust, salt mist or oil smoke.
2) Wet and damp places, with direct sunlight.
3) Places near high temperature objects or places where units might be
splashed by water.

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3.2 Wiring Instructions
3.2.1 Wiring Ports
Port print
G1, G2
F1, F2
A2, B2
A3, B3
L, N
Meaning
CAN
comm.
port
fire alarm port 【reserved
port】L-CAC&Split
unit port Power port
3.2.2 Power Supply
The centralized controller shall use independent power supply.
The range of input voltage: 100~240 VAC; Frequency range: 50/60Hz
Select power cord according to the following table. Never use the power cord
that is not in compliance with instructions of this manual.
Cord type Cord standard Cord size (mm2)
Single-cord soft
conductiveunsheathed
cord
(60227 IEC 08)
IEC 60227-3:2007 1.5
3.2.3 Connection Method of Multi-VRF (CAN Network)
There are three methods to connect centralized controller with the Multi-VRF
system.
Method 1: Connect with indoor network
Fig.3.4 Centralized Controller Connected with Indoor Network

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Method 2: Connect with outdoor network
Fig.3.5 Centralized Controller Connected with Outdoor Network
Method 3: Connect with heat recollection mode converter Network
Fig. 3.6 Centralized Controller Connected with Heat Recollection Mode Converter
Network

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Wiring Instructions:
(1) The centralized controller is applicable to multi VRF units, connectable with
network of indoor units or the network of outdoor units. One centralized
controller can control up to 16 sets of outdoor system and up to 255 sets of
indoor unit.
(2) If the centralized controller is to be connected with the network of indoor units,
connect according to fig.3.4. The centralized controller can only be connected
with the terminal unit of indoor network. A matching resistance needs to be
added with the communication cords at the G1 and G2 ports.
(3) If the centralized controller is to be connected with the network of outdoor units,
connect according to fig.3.5. The centralized controller can only be connected
with the terminal system of the outdoor network. A matching resistance needs
to be added with the communication cords at the G1 and G2 ports.
(4) The centralized control address DIP switch (SA2_Addr-CC) indicates the
centralized control address required when different refrigerating systems are
controlled in a centralized manner. The default factory setting is "00000".
(5) If the centralized controller is to be connected with the network of heat
recollection, connect according to Fig.3.6. The method 2 is also applicable to
centralized controller switching in heat recollection network.
If the centralized controller is to be connected with the network of outdoor units,
set the DIP switch according to the following methods:
1) The DIP switch must be set on the master unit and set the Master Unit
Setting DIP Switch(SA8) to "00". Otherwise, the setting is invalid.
2) On the same refrigerating system, the centralized control address DIP switch
(SA2_Addr-CC) on a non-master unit is invalid, and it is unnecessary to change
the settings.
3) The centralized control address DIP switch (SA2_Addr- CC) on the master
unit of a refrigerating system must be set to “0000/”, and this system is the
master system.
4) The centralized control address DIP switch (SA2_Addr- CC) on the master
unit of other refrigerating systems must be set as follows:

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SA2
Address
NO.
DIP1
DIP2
DIP3
DIP4
DIP5
1
0
0
0
/
2
0
1
0
0
/
3
1
1
0
0
/
4
0
0
1
0
/
5
1
0
1
0
/
6
0
1
1
0
/
7
1
1
1
0
/
8
0
0
0
1
/
9
1
0
0
1
/
10
0
1
0
1
/
11
1
1
0
1
/
12
0
0
1
1
/
13
1
0
1
1
/
14
0
1
1
1
/
15
1
1
1
1
/
16
5) The centralized control address DIP switch (SA2_Addr-CC) cannot be the
same between different refrigerating systems. Otherwise, address conflicts
may occur and the unit cannot run properly.
NOTES:
①Centralized control address DIP5 invalid.
②If the centralized control address DIP switch (SA2_Addr-CC) on the master
unit of one of VRF system is set to “1111X”, The system is the master
mode system, the indoor units of other systems can not set the mode of
conflicting with the master mode system.
For example: When master mode system is set to cooling mode, the indoor
unit of other systems can not set heating mode.
6) If the address conflict occurs, it will popup the address conflict page.
NOTES:
There are three ways to solve address conflict.
①Enter into an unoccupied address by manually for the conflict address, the
address conflict can be solved after it set up success.

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②Press and hold the “Save” button for 5 seconds on the address conflict page,
select reset all the IDU’s address in the system, after entering the engineering
password, system will reassign all the address.
③On the master unit of master system, if the mainboard has 7 buttons,press
“SW3” to enter the to-be-selected status of function settings, press “SW1 (UP) ”
or “SW2 (DOWN) ” to select the function of “n5”, press “SW7” to enter “n5”
function settings, press “SW7” again to send the project number offset command.
If the mainboard has 4 buttons, press and hold “SW1” for 5 seconds to enter
the to-be-selected status of function settings, press “SW1 (UP)” or “SW2
(DOWN) ” to select the function of “n5”, press “SW3” to enter “n5” function
settings, press “SW3” again to send the project number offset command.
3.2.4 Connection Method of L-CAC&Split Unit (Modbus network)
The central controller has two ways to connect with the unitary system:
Method 1：the centralized controller Connect with U-match Unit（Modbus
network）according to the below
Fig. 3.7 Centralized Controller Connected with U-match Unit

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Fig. 3.8 Centralized Controller Connected with U-match Unit
Fig.3.9 Centralized Controller Connected with PAC Unit
Wiring Instructions:
(1) The centralized controller is applicable to U-match units (Including PAC units),
One centralized controller can control up to 36 U-match units.
(2) If the centralized controller is to be connected with U-match units which have
COM_BMS ports, connect according to fig.3.7. The controller must connect
with terminal unit of U-match system. Connect the centralized controller’s A3
and B3 ports to COM_BMS port on the U-match unit correspondingly with
communication cords. A matching resistance needs to be added with the
communication cords at the A3 and B3 ports. There are two COM_BMS ports
(two core neilsbed and no polarity) on mainboard of U-match unit, one for
centralized controller and another for U-match unit connection.

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NOTE:
If the centralized controller is to be connected with U-match units，communication
line(one end is two-core terminal, the other end is the bare wire. Code:
420400060252)need to be purchased separately. The quantity of
communication line is the quantity of U-match units plus 1.
(3) If the centralized controller is to be connected with U-match units which have
6-core neilsbed, connect according to fig.3.8. The controller must connect with
terminal gateway. Connect the centralized controller’s A3 and B3 ports to A
and B port on the Modbus Gateway. A matching resistance needs to be added
with the communication cords at the A3 and B3 ports. The modbus gateway
connecte to 6-core neilsbed of U-match mainboard, need to be purchased
separately. Each U-match unit need one Modbus gateway.
(4) The indoor unit address must be set within the range from 1 to 36, and
different from each other. Identicle addresses will lead to communication
failure. Below is the address setting method:
1) Under OFF status, press “Function” and “Mode” on the wired controller
simultaneously for 5S to enter the address setting. Then the display panel
will show its own address number on the temperature display zone. Adjust
the number by pressing the “Up” and “Down” buttons.
2) When setting is over, press “OK/Cancel” or “Swing/Enter” to save the
setting and exit. Under the setting status, if no action is taken within 20S,
system will exit from the setting and return to the display mode of OFF
status. Setting can’t be saved in this case.
(5) Communication method of U-match units must be long-distance monitoring
mode, else can not communicate with centralized controller, set the way as
follows.
1) Under OFF status, press “Function” and “Timer” on the wired controller
simultaneously for 5S to enter the setting of long-distance monitor. Press
“Mode” button to adjust to “10” in tempeture display zone, then choose “01”
enter into long-distance monitoring mode by pressing the “Up” and “Down”
buttons.
2) When setting is over, press “OK/Cancel” or “Swing/Enter” to save the
setting and exit. Under the setting status, if no action is taken within 20

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seconds, system will exit from the setting and return to the display mode of
OFF status. Setting can’t be saved in this case.
NOTE:
Address setting and long-distance monitor setting of unitary units can only be
achieved through wired controllers, the setting mode of different remote
controllers may be different. Please refer to the relevant technical service
manual for details.
(6) If the centralized controller is to be connected with PAC units, connect
according to fig.3.9. Each PAC unit is connected with can interface of gateway
through COM interface, and gateway 485 interface is connected with A3 and
B3 interface of centralized controller.
(7) Gateway address setting and function code setting:
The gateway address should be set by S1 and S2 together, and the address
setting range is 1 ~ 36. The gateway function code setting needs to set the first
bit of S3 to on terminal, otherwise the centralized controller will not be able to
communicate normally.
NOTE:
A gateway can only be connected to one PAC unit. It is not possible to connect
a gateway to multiple units at the same time.
Method 2: The central controller connects to the free match by the method as below:
Fig.3.10 Centralized Controller Connected with Wired Controller

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Wiring Instructions:
(1) The connection sketch map of control system is shown by the fig. 3.10.
The complete control system is composed of long-distance central controller,
wired controller and telecommunication cable. The wired controller matched
with long-distance central controller can support 36 addresses of
communication node at the most.
NOTE:
If the centralized controller is to be connected with Wired Controller，
communication line(one end is two-core terminal, the other end is the bare
wire. Code :420400060252)need to be purchased separately. The quantity of
communication line is the quantity of Wired Controller plus 1.
(2) Wiring terminals of port A3 and port B3 of the central controller or the longdistance
controller connect to the corresponding terminal of communication needle stand of #1
wired controller through the telecommunication cable respectively; the other needle
stand of #1 wired controller connects to the #2 wired controller through the
telecommunication cable and so forth until connect to the #36 wired controller. Except
the last wired controller in the control system (only use CN3 or CN4, and the other one
will not be connected), there’s no the sequence and the importance for the wired
controller. The series number in the figure is only for the sake of clarity.
(3) There is a 2-bit DIP switch on the main board of wired controller As for the last #36
wired controller in the control system, the 1-bit and the 2-bit of the DIP switch should
be manually pulled to position “on” and position “off” respectively. The DIP switches of
other wired controllers should be kept at the initial ex-factory status (1-bit and 2-bit are
set at position “off”).
(4) As for the complete control system, the distance from the long-distance central
controller to the communication cable of the last communication node should
be less than 500m.
NOTE:
U-match units and free match units can be mixed to connected with centralized
controller. The quantity is less than 36.

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3.3 Installation Procedure
Fig.3.11 Installation Diagram
Unit:mm
Fig.3.12 Diagram of Wooden or Plastic Plug

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Unit:mm
Fig. 3.13 Installation Holes of the Electric Box Rear Cover
Fig.3.11 is a simple installation procedure of centralized controller. Please pay
attention to the following matters:
(1) Before installation, first cut off the power supply of indoor unit. The power must
be cut off during the whole installation process.
(2) During the installation, be careful not to damage to touch screen.
(3) Before installation, please make the following preparations:
1) In case that the centralized controller is installed on wall, dig a hole that is
the size of 180mm×107mm×62mm and peg 4 wooden or plastic plugs on
the wall according to fig.3.12.
2) In case that the centralized controller is installed inside the control cabinet,
dig 4 installation holes on the surface of the control cabinet according to
fig.3.13.
(4) In step ①, pull out the power core and communication cord, and then lead
them separately from the wire orifice of the electric box rear cover. Never lead
the cords through a same orifice.
(5) In step ①, pull out the power core and communication cord, and then lead
them separately from the wire orifice of the electric box rear cover. Never lead
the cords through a same orifice.
(6) In step ⑥pull out the wire connecting the touch screen and controller’s rear
cover. Put the touch screen on a safe place.

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(7) In step ⑦, connect the communication cords to G1, G2 terminals, and connect
the neutral wire and live wire to the N, L terminal; connect the ground wire to
position on the electric box rear cover. Secure it with screw M4×12.
(8) In step ⑧, locate the controller’s rear cover onto the electric box rear cover
with screw ST4.2×9.5 MC.
(9) In step ⑨, connect the wire between touch screen and controller’s rear cover.
3.4 Removal Procedure
Fig.3.14 Diagram of Removal
4 Display and Working Instructions
Fig.4.1 Main Page

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4.1 Main Page Display and Buttons
No. Name Instructions
1 Time zone The present date, week and time.
2 Help button Press this button to enter Help Info page.
3 Setting button Press this button to enter setting page.
4
L-CAC&Split unit button
Press this button to enter L-CAC&Split unit
page.
5 Touch button
Press the Touch Button to turn on/off the
screen of centralized controller.

Press and hold the Touch Button for
5sec to restart to centralized controller.
6 Schedule button Press this button to enter schedule page.
7 Group button Press this button to enter group page.
8 All-Control button Press this button to enter All-Control page.
9 VRF Unit button Press this button to enter indoor units,
water/floor units or fresh air units control
page.