Gree ME34-44/G User manual

Owner's Manual
Original Instructions
24 Volt Adaptor
Model: ME34-44/G
Thank you for choosing our product.
Please read this Owner’s Manual carefully before operation and
retain it for future reference.
If you have lost the Owner's Manual, please contact the local agent
or visit www.gree.com or send an email to [e-mail] for
the electronic version.
GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI

To Users
Thank you for selecting Gree’s 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) In order to make the product better, we will continuously conduct
improvement and innovation. We have the right to make necessary revision
to the product from time to time due to the reason of sales or production,
and reserve the right to revise the contents without further notice.

(4) For personal injury or property loss and damage caused by improper
operation such as improper installation and debugging, unnecessary
maintenance, violation of related national laws and rules and industrial
standard, and violation of this instruction manual, etc., we will bear no
liability.
(5) The 24 Volt Adaptor is the universal component. When indoor unit has
connected with the 24 Volt Adaptor , display status of indoor unit is decided
by the indoor unit. Valid status and invalid status are all belong to normal
status.
(7) The final right to interpret for this instruction manual belongs to Gree
Electric Appliances Inc. of Zhuhai.
(6) The 24 Volt Adaptor is a general model, applicable for several kinds of units.
Some functions of the 24 Volt Adaptor are not available for certain kinds of
units, more details please refer to the owner’s manual of unit. The setting of
such unavailable function will not affect unit’s operation.

Contents
1 Safety Notices (Please be sure to abide ) .......................... 1
2 Notices for Use .................................................................... 2
3 Functions Overview ............................................................. 3
4 Detail Introduction ............................................................... 4
4.1 Interface Function Instruction .................................................. 4
4.2 Button Instruction .................................................................... 6
4.3 Display Instruction ................................................................... 7
4.4 Function Instruction ................................................................. 7
5 Product Installation ........................................................... 14
5.1 Product Dimension ................................................................ 14
5.2 Installation Procedure ........................................................... 15
5.3 Communication Connection .................................................. 16
6 Malfunction Display ........................................................... 20

24 Volt Adaptor
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1 Safety Notices (Please be sure to abide)
WARNING: If these safety notices are not abided strictly, it may cause
severe damage to the unit or the people.
NOTE: If these safety notices are not abided strictly, it may cause slight or
medium damage to the unit or the people.
This sign indicates that the items operation 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 conditioners with anti-corrosive or anti-explosion function.

24 Volt Adaptor
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2 Notices for Use
NOTICE
(1) This device use 24VAC for power supply. Do not connect other power to this
device. Otherwise, it may cause fire hazard or damage to the unit.
(2) Before touching the electric components, please be sure the appliance is
disconnected to power.
(3) Never install the appliance in a damp place or allow it to be exposed to direct
sunlight.
(4) Never install the appliance near heat source or a place that may easily get
splashes of water.
(5) Please install the appliance in a place without electromagnetic interference or
dusty particles.
(6) Make sure that the communication wires are connected to the correct ports,
otherwise communication failure will occur and may damage the appliance.
(7) Once wires are connected, use insulative tape to protect the wires from
oxidation and short circuit.
(8) Working conditions for the appliance:
Temperature: -20~+60°C;
Relative humidity: 85%;
Install it indoors and avoid direct sunlight, rain and snow.
(9) Thermostat should be configured for use with a conventional system.
(10) Functions with “*” are optional for indoor units. If a function is not included in an
indoor unit, the adaptor can’t set the function, or setting of this function is invalid
to the indoor unit.

24 Volt Adaptor
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3 Functions Overview
24 volt adaptor is applicable for Gree split-type unit, cassette unit, duct-type unit,
floor ceiling unit and so on.
Transfer the control signal of 24VAC HVAC Thermostat (such as nest) into the control
signal of Gree split-type unit, cassette unit, duct-type unit, floor ceiling unit and so on to
make the third party 24VAC HVAC Thermostat can control Gree split-type unit, cassette
unit, duct-type unit, floor ceiling unit and so on. The device type should be set as “24 Volt
Adaptor”. As for different type of 24VAC HVAC Thermostat the output 24VAC signal is
different. Please set different interface type for 24 volt adaptor according to the output
signal type of your purchased 24VAC HVAC Thermostat.
NOTE!
The signal of 24VAC HVAC Thermostat is the control command for controlling
compressor, 4-way valve, indoor fan and other loads (set “00” for P01).And
the type of 4-way valve (P02) also needs to be set. Refer to “parameter
setting” for details.
The signal of 24VAC HVAC Thermostat is the control command for setting
cooling, heating, fan and other operation modes (set “01” for P01).

24 Volt Adaptor
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Please refer to the section of parameter setting for detailed setting operation.
Appearance of 24 volt adaptor is shown as below:
Fig. 3.1 Appearance of 24 volt adaptor
4 Detail Introduction
4.1 Interface Function Instruction
Schematic diagram of interface of main board and interface function instruction
are shown as below:

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Fig.4.1 Schematic diagram of interface’s function
Table 4.1.1 Function instruction of interface of main board
No. Interface Instruction
1 H1, H2 RS485 communication interface,
connecting the indoor unit
2 O/B 4-way valve for heat pumps
3 TR Supply power for adapter (24VAC)
SW4
1
SW3
SW2
SW1
2 3 4 5 6 7 8 9 10 11 12

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No. Interface Instruction
4 R Supply power for thermostat (24VAC)
5 TC Supply power for adapter (Common)
6 C Supply power for thermostat
(Common)
7 G Fan/ indoor fan
8 W Heating/E-heater
9 Y Cooling/compressor
10 G1 Low fan speed
11 G2 Medium fan speed
12 G3 High fan speed
4.2 Button Instruction
Function instruction for buttons are shown as below:
Table 4.2.1 Function instruction for buttons
No. Buttons name Button function
SW1 BACK Return after parameter setting
SW2 DOWN Decrease parameter setting
SW3 UP Increase parameter setting
SW4 ENTER Enter into project parameter setting and
confirm parameter setting value

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4.3 Display Instruction
3-bit nixie tube displays error code and engineering parameter setting.
Table 4.3.1 Display of 3-bit nixie tube
Display content Meaning
Error code
When there’s malfunction for the unit, please contact
the after-sales service person. Please refer to the
section of “error code” for the detailed error content.
4.4 Function Instruction
4.4.1 Mode Setting
(1) When setting the signal of 24VAC as the control command of compressor,
4-way valve, indoor fan and other loads (set “00” for P01), the interface
meaning is as below:
Table 4.4.1 Interface meaning of 24 Volt Adaptor (load control)
Interface Meaning
O/B 4-way valve for heat pumps
G Indoor fan
W E-heater
Y Compressor
G1 Low fan speed
G2 Medium fan speed
G3 High fan speed

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When setting O/B interface as the interface of 4-way valve for cooling, the
corresponding operation modes for the input signals of different interfaces on the
main board is:
Table 4.4.2 Corresponding operation mode for each input
Note: “G” in the below table represents G/G1/G2/G3 signal of thermostat.
Note: “G” in the below table represents G/G1/G2/G3 signal of thermostat.
signal (set “01” for P02)
Y G O W Mode
* × * * OFF
× * × Fan
× × Heating
× * Heating and E-heater
× × OFF
× Cooling
× Heating and E-heater
OFF
When setting O/B interface as the interface of 4-way valve for heating the
corresponding operation modes for the input signals of different interfaces on the
main board is:
Table 4.4.3 Corresponding operation mode for each input signal (set “00” for P02)
Y G B W Mode
* × * * OFF
× * × Fan
× × Cooling
× * Heating and E-heater

24 Volt Adaptor
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Y G B W Mode
× × OFF
× Heating
× OFF
Heating and E-heater
(2) When setting 24VAC signal as the control command for cooling, heating,
fan and other operation modes (set “01” for P01), the interface meaning is
as below:
Table 4.4.4 Interface meaning of 24 Volt Adaptor (mode control)
Interface Meaning
G Fan
W Heating
Y Cooling
G1 Low fan speed
G2 Medium fan speed
G3 High fan speed
The corresponding operation modes for the input signals of different interfaces
on the main board are:
Table 4.4.5 Corresponding operation mode for each input signal (mode control)
Y W G G1 G2 G3 Mode
× * * * * Cooling

24 Volt Adaptor
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Y W G G1 G2 G3 Mode
× * * * * Heating
× × * * * Fan
× × * * * Fan
× × * * * Fan
× × * * * Fan
* * * * OFF
× × × × × × OFF
NOTES!
“ ” indicates ON; “×” indicates OFF; “*”indicates ON or OFF.
When mode is Heating and E-heater If the unit supports auxiliary heating,
when it meets the activation condition of auxiliary heating under heating
mode, the auxiliary heating mode will be turned on.
When G1, G2 and G3 are all OFF, the defaulted fan speed is auto fan
speed (change the fan speed by referring to the parameter setting P03
Refer to “parameter setting” for details); When any one interface of G1, G2
and G3 is ON, the fan speed is decided by the signal of G1, G2 and G3.
See the table as below:
Table 4.4.6 Control of fan speed
G G1 G2 G3 Mode
* * * High fan speed
* * × Medium fan speed
* × × Low fan speed

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4.4.2 Temperature Setting
(1) When the unit is operating under cooling mode, the adaptor is fixed to send
the set temperature of 16°C to the indoor unit;
(2) When the unit is operating under heating mode, the adaptor is fixed to send
the set temperature of 30°C to the indoor unit;
(3) When the unit is operating under fan mode, the adaptor is fixed to send the
set temperature of 26°C to the indoor unit.
4.4.3 Parameter Setting
(1) Press “ENTER” button to enter into parameter setting page. The nixie tube
displays “P00”.
(2) Press “UP” or “DOWN” button can select parameter code. Press “ENTER”
button to switch to parameter value setting and the nixie tube flashes to
display the parameter value. Press “UP” or “DOWN” button can adjust the
parameter value and then press “ENTER” to complete the setting and
return to previous level.
(3) Press “BACK” button to return to previous level.
NOTE!
After entering the parameter setting state, there will be no operation in 20s, and
the parameter setting state will be exited.
Unit parameters setting list is shown as below:

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Table 4.4.7 Unit parameters setting list
Parameter
code
Parameter
name Parameter range Default value Remark
P00 Error code
check
The last 5 error
codes occurred - -
Check historic error. When nixie tube
displays “P00”, press “ENTER
SW4 ”button to enter historic error
check; press “UP SW3 ”or“DOWN
SW2 ”to switch to display 5 historic
errors.
P01
Device type
setting
00: 24 Volt
Adaptor(load
control)
01: 24 Volt
Adaptor(mode
control)
00
When set to “00”, “01”, as an adapter for
the 24V thermostat, it needs to be
connected to a third-party thermostat.
P02
Energization
method of
4-way valve
00 4-way valve of
heating is
energized
01 4-way valve of
cooling is
energized
00
“O” is applicable for the unit which
operates under the cooling mode and its
4-way valve is energized;
“B” is applicable for the unit which
operates under the heating mode and its
4-way valve is energized;
P03
Fan speed
setting
00: auto
01: low
02: medium
03: high
04: turbo
00
When P03 is set at “00”, the fan speed
when the indoor unit is started is subject
to the signal of temperature controller;
when P03 is set at other parameter (not
“00”), P03 shall prevail and it can be set
as low, medium, high, and turbo fan speed.
Air supply mode should not be set as turbo.
Air supply mode cancels turbo.

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P04 Delay OFF
time setting
00: 0min
01: 5 min
02: 10 min
03: 30 min
00
When the third party thermostat has
reached to the temperature point (Y and
W signal are all OFF), the adaptor will
continue to operate for a period of time
for ensuring the operation effect. The
delay OFF time can be set through P04
setting.
Parameter
code
Parameter
name Parameter range Default value Remark

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5 Product Installation
5.1 Product Dimension
unit: mm
Fig. 5.1 Product dimension

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Note:
If the wires may loose when fixing them with a wire clip, the wires once or
more times and then fix them with a wire clip. Otherwise, the communication
function may be affected due to the unreliable fixing.
5.2 Installation Procedure
(1) Twist off the screws used for fixing the cover, and then open the cover of
24 volt adaptor.
(2) Check whether the screws used for fixing the screws of main board is loose.
If yes, please tighten the screws until the main board is fixed.
(3) Attach the bottom case of 24 volt adaptor at the in stallation position (such
as wall), and then use the screw to fix the bottom case and the installation
hole on the wall together.
Connect the wires to the corresponding wiring terminal by passing through
the rubber ring, and then tighten the screws on the contact to fix the
connection wire.
(4) Press the wires with wire-fixing clamp and then tighten the screws used for
fixing the wire-fixing clamp.

16
24 Volt Adaptor
Fig. 5.2 Wiring diagram
5.3
Communication Connection
5.3. 1 Connection between Adapter and Indoor Unit
Connect H1 and H2 of communication interface of adaptor RS485 to
corresponding position of wired controller of unit to finish the installation.