GREE ME33-42/G Dry Contact and 24 Volt Adaptor Owner’s Manual

Owner’s Manual
Original Instructions
Dry Contact & 24 Volt Adaptor
Model: ME33-42/G

Thank you for choosing this product. Please read this Owner’s Manual carefully before operation and retain it for future reference.
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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 the 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 the use of the appliance by a person responsible 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 a particular product. All the illustrations and information in the instruction manual are only for reference, and the 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 revisions 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 an improper operation such as improper installation and debugging, unnecessary maintenance, violation of related national laws and rules and industrial standards, and violation of this instruction manual, etc., we will bear no liability.
5. The final right to interpret for this instruction manual belongs to Gree Electric Appliances Inc. of Zhuhai.

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, they may cause slight or medium damage to the unit or the people.
This sign indicates that the operation of the item 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 in a corrosive, inflammable, or explosive environment or a place with special requirements, such as the kitchen. Otherwise, it will affect the normal operation or shorten the service life of the unit, or even cause fire hazards or serious injury. As for the above special places, please adopt special air conditioners with anti-corrosive or anti-explosion functions.

Notices for Use

NOTICE ！

(1) This device use 24VAC for power supply. Do not connect other power to this device. Otherwise, it may cause a fire hazard or damage to the unit.
(2) Before touching the electric components, please be sure the appliance is disconnected from 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 a 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:

① Temperature: -20~+60°C;

② Relative humidity: ≤85%;

③ 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 the setting of this function is invalid for the indoor unit.

Functions Overview

Dry contact & 24-volt adaptor is applicable for the Gree rooftop packaged unit, and U-Match unit. It can realize two functions:
(1) Transfer the control signal of the 24VAC HVAC Thermostat (such as nest) into the control signal of Gree rooftop packaged unit, U-Match unit to make the third party 24VAC HVAC Thermostat can control the rooftop packaged unit, U-Match unit. The device type should be set as “24 Volt Adaptor”. As for the different types of 24VAC HVAC thermostats, the output 24VAC signal is different. Please set different interface types for the 24-volt adaptors according to the output signal type of your purchased 24VAC HVAC Thermostat.
NOTICE ！
① The signal of the 24VAC HVAC Thermostat is the control command for controlling the 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.
② The signal of the 24VAC HVAC Thermostat is the control command for setting cooling, heating, fan, and other operation modes (set “01” for P01).
(2) The detection function of a fire alarm signal and other dry contact signals is used for detecting the signals, such as fire alarm and overflow protection of external water tray, for control the shutdown of the air conditioner. The device type can be set as “24 Volt Adaptor” or “Dry Contact Adaptor”. Please refer to the section on parameter setting for detailed setting operation. The appearance of dry contact & 24-volt adaptor is shown below:

Detail Introduction

4.1 Interface Function Instruction
A schematic diagram of the interface of the main board and interface function instructions are shown below:
Table 4.1.1 Function instruction of interface of the main board

No.

| Interface|

Instruction

---|---|---
1| I3, O3| Dry contact 3
2| I2, O2| Dry contact 2
3| I1, O1| Dry contact 1
4| F1, F2| Fire alarm detection
---|---|---

5

|

H1, H2

| RS485 communication interface, connecting the indoor unit
6| O/B| 4-way valve for heat pumps
7| TR| Supply power for adapter (24VAC)
8| R| Supply power for thermostat (24VAC)
9| TC| Supply power for adapter (Common)

10

|

C

| Supply power for thermostat (Common)
11| G| Fan/ indoor fan
12| W| Heating/E-heater
13| Y| Cooling/compressor
14| G1| Low fan speed
15| G2| Medium fan speed
16| G3| High fan speed

4.2 Button Instruction
Function instructions for buttons are shown below:
Table 4.2.1 Function instructions for buttons

SW4

|

ENTER

| Enter into project parameter setting and confirm parameter setting value

4.3 Display Instruction
(1) Status instruction of the LED indicator is as below:
Table 4.3.1 Status instruction of LED indicator on main board

D13| When there’s a signal for the detection interface of the fire alarm, it’s on; when the signal of the fire alarm disappears, it’s off.
---|---
D14| When there’s a signal for dry contact 1, it’s on; when the signal of dry contact disappears, it’s off.
D15| When there’s a signal for dry contact 2, it’s on; when the signal for dry contact 2 disappears, it’s off.
D16| When there’s a signal for dry contact 3, it’s on; when the signal of dry contact 3 disappears, it’s off.

(2) 3-bit nixie tube displays on/off status, error code, and engineering parameter setting.
Table 4.3.2 Display of 3-bit nixie tube

Display content

|

Meaning

---|---
ON| Turn on the unit
OFF| Turn off the unit
CC| Some or all functions of the unit have been shielded by an integrated controller, remote control, and other control terminals. Operation is not available.
Error code| When there’s a 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 the 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

When setting the O/B interface as the interface of the 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 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 the O/B interface as the interface of the 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
×| ×| √| √| OFF
---|---|---|---|---
√| √| √| ×| Heating
√| √| ×| √| OFF
√| √| √| √| Heating and E-heater

(2) When setting the 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

---|---
O/B| Valid
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
×| √| | | | | Heating
---|---|---|---|---|---|---
×| ×| √| | | | Fan
×| ×| | √| | | Fan
×| ×| | | √| | Fan
×| ×| | | | √| Fan
√| √| | | | | OFF
×| ×| ×| ×| ×| ×| OFF

NOTES!
① “√” indicates ON; “×” indicates OFF; “*” indicates ON or OFF.
② When the mode is Heating and E-heater: the unit supports auxiliary heating when it meets the activation condition of auxiliary heating under the heating mode, the auxiliary heating mode will be turned on.
③ When G1, G2, and G3 are all OFF, the default fan speed is the 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 below:
Table 4.4.6 Control of fan speed

G

| G1| G2| G3|

Mode

---|---|---|---|---
| | | √| High fan speed
| | √| ×| Medium fan speed
| √| ×| ×| Low fan speed

④ When a long-distance monitor or centralized controller has sent the shielding command, the indoor unit’s status can’t be changed by the thermostat, and the nixie tube displays “CC”. If it’s the locking status, press the button, and “CC” will flash to display, which indicates the invalid operation.
4.4.2 Temperature Setting

1. When the unit is operating under the 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 the 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 Fire Alarm and Dry Contact Signal Detection

1. Fire alarm signal detection: When the fire alarm signal is detected, the fire alarm signal LED will be on and dry contact & 24-volt adaptor will turn off the unit; when the fire alarm signal disappears, the fire alarm signal LED will be off and it will resume the original operation status (set it to keep the off status after the fire alarm signal is disappeared through the parameter setting P05).
2. Dry contact signal detection: When the signal is detected by the dry contact interface, the corresponding dry contact LED will be on and the dry contact & 24-volt adaptor will turn off the unit. The unit can’t be turned on; when all dry contact signals are disappeared, the corresponding dry contact signal LED will be off and keep the off status. The unit can be turned on.

NOTES!
If the adaptor is completely shielded (locked), dry contact and fire signal will be invalid. When the fire alarm or dry contact signal is detected, the operation of the wired controller and remote controller is disabled.
4.4.4 Parameter Setting
Unit parameters can be set under on or off status.

1. Press the “ENTER” button to enter the parameter setting page. The nixie tube displays “P00”.
2. Press the “UP” or “DOWN” button can select the parameter code. Press the “ENTER” button to switch to the parameter value setting and the nixie tube flashes to display the parameter value. Press the “UP” or “DOWN” button can adjust the parameter value and then press “ENTER” to complete the setting and return to the previous level.
3. Press the “BACK” button to return to the previous level.

NOTES!
After entering the parameter setting state, there will be no operation in the 20s, and the parameter setting state will be exited. The unit parameters setting list is shown below:
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 the historic error. When the nixie tube displays “P00”, press the “ENTER（SW4” button to enter the historic error check; press “UP（SW3” or“DOWN（SW2）” to switch to display 5 historic errors.
P01| Device typesetting| 00: 24 Volt Adaptor(load control)
01: 24 Volt Adaptor(mode control)
02: Dry Contact Adaptor| 00| When set to “00”, or “01”, as an adapter for the 24V thermostat, it needs to be connected to a third-party thermostat. It also has the function of fire alarm and dry contact signal detection, while it can’t be matched with the wired controller for operation and it is not recommended to use with remote monitoring and centralized controller.
When set to “02”, this device is only used as a dry contact detection board. It is only used to detect fire alarms and dry contact signals, and it can’t be connected to a third-party thermostat. In this case, the device can be matched with the wired controller, while this device should be set as a slave device. Refer to the setting on P06.

Parameter code

| Parameter name| Parameter range| Default value|

Remark

---|---|---|---|---
P02| Energization method of the 4-way valve| The 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 and low
03: medium
04: medium and high
05: High
06: turbo| 00| When P03 is set at “00”, the fan speed when the indoor unit is started is subject to the signal of the temperature controller; when P03 is set at another parameter (not “00”), P03 shall prevail and it can be set as low, medium and low, medium, medium and high, high, and turbo fan speed. When P01 is set at”02”, this parameter cannot be set. When the unit is operating under fan mode, P03 cannot be set at “06”.
P04| Delay OFF time setting| 00: 0min
01: 5 min
02: 10 min
03: 30 min| 00| When the third-party thermostat has reached the temperature point (Y and W signals are all OFF), the adaptor will continue to operate for a period of time for ensuring the operation effect. The delay of time can be set through P04

setting.

Parameter code

| Parameter name| Parameter range| Default value|

Remark

---|---|---|---|---
P05| Indoor unit’s operation status when the fire alarm signal is

disappeared

| 00: resume to the previous status 01: keep OFF status| 00| When set to “00”, resume to the status before the fire alarm signal (when the previous signal is ON, resume ON status when the fire alarm is disappeared); When set to “01”, keep the OFF status when the fire alarm signal is disappeared.
P06| Device address setting| 01: the master device

02: slave device

| 01| This device is only used as a dry contact detection board (when P01 is set at “02”); when it’s used with the wired controller, it needs to set the wired controller and this device: one is set as a master device and the other one is set as slave devise.
P07| Static pressure setting for indoor fan| 01, 02, 03, 04, 05,
06, 07, 08, 09| 05| There are two kinds of static pressure levels:
Low static pressure: 03, 04, 05, 06, 07
High static pressure: 01, 02, 03, 04, 05,
06, 07, 08, 09

Product Installation

5.1 Product Dimension
unit: mm 5.2 Installation Procedure

1. Twist off the screws used for fixing the cover, and then open the cover of dry contact & 24-volt adaptor.
2. Check whether the screws used for fixing the screws of the main board are loose. If yes, please tighten the screws until the main board is fixed.
3. Attach the bottom case of dry contact & 24-volt adaptor at the installation position (such as a 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 the wire-fixing clamp and then tighten the screws used for fixing the wire-fixing clamp.
5. Close the gateway cover of dry contact and then tighten the screws used for fixing the cover.

5.3 Communication Connection
5.3.1 Connection between Adapter and Indoor Unit
Connect the H1 and H2 of the communication interface of adaptor RS485 to the corresponding position of the wired controller of the unit to finish the installation.
Communication connection method:

1. When the device type for dry contact & 24-volt adaptor is the dry contact adaptor, the adapter can be matched with the wired controller for operation. There are two wiring methods with the indoor unit’s network which are shown in Fig. 5.3, Fig. 5.4;
   Dry Contact & 24 Volt Adaptor
   Fig. 5.4 One adaptor and one wire controller control one indoor unit

2. When the device type is 24 volt adaptor, the adaptor can’t be matched with the wired controller for operation. There is only one wiring method with the indoor unit’s  network, which is shown as below:
   

NOTE!
The RS485 communication interface of dry contact & 24-volt adaptor is the non- polar interface. It’s no need to consider the polar of the RS485 interface for wiring.
5.3.2 Connection of Adaptor and Thermostat
The connection between dry contact & 24-volt adaptor and the third-party 24VAC HVAC thermostat is shown as below:

1. When the output signal of the thermostat is the control command of load, such as compressor, 4-way valve, and indoor fan. The connection method is shown as below:
   NOTE!
   The 4-way valve interface of a 24VAC HVAC thermostat may only have type “O” or
   “B”, and it can also connect the O/B of the adaptor, while it needs to set the adaptor to ensure that the adaptor has the same meaning as the interface of the 24VAC HVAC thermostat.

2. When the output single of a 24VAC HVAC thermostat is the control command for operation modes, such as heating, cooling, or fan mode. The connection to the method is shown below:
   

Malfunction Display

When there’s a malfunction during operation, the nixie tube of dry contact & 24-volt adaptor will display the error code. If multiple malfunctions occur at the same time, error codes will be displayed circularly.
CAUTION:
When there’s a malfunction, please turn off the unit and ask for a professional person to maintain it.

refrigerant collection mode
E4| Compressor air discharge high-temperature protection
E6| Communication error
E8| Indoor fan error
E9| Water-full protection
Error Cod| Error
---|---
F0| Indoor ambient temperature sensor error
F1| Evaporator temperature sensor error
F2| Condenser temperature sensor error/Middle part of condenser temperature sensor error
F3| Outdoor ambient temperature sensor error
F4| Discharge temperature sensor error
F5| Wired controller temperature sensor error
C5| IDU jumper cap error
EE| IDU or ODU memory chip error
PF| Electric box sensor error
H3| Compressor overload protection
H4| Overload
H5| IPM protection
H6| DC fan error
H7| Driver out-of-step protection
HC| PFC protection
Lc| Startup failure
Ld| Compressor phase-sequence protection
LF| Power protection
LP| IDU and ODU unmatched or Controller unmatched
U7| 4–way valve switch-over error
P0| Driver reset protection
Error Code| Error
---|---
P5| Over-current protection
P6| Master control and driver communication error
P7| Driver module sensor error
P8| Driver module high-temperature protection
P9| Zero-crossing protection
PA| AC current protection
Pc| Driver current error
Pd| Sensor connection protection
PE| Temperature drift protection
PL| Bus low-voltage protection
PH| Bus high-voltage protection
PU| Charging loop error
PP| Input voltage error
ee| Driver memory chip error
C4| ODU jumper cap error
dJ| Phase-loss and anti-phase protection
of| ODU error, for specific error please see the status of the ODU indicator
EL| Emergency stop
LE| Compressor stall protection
F6| Condenser medium pipe temperature sensor error
EH| Auxiliary heating protection
Un| Communication error between grid-connected drive board and main control board
Error Code| Error
---|---
CJ| DIP switch code error
Ud| Invalid configuration information of inverter
GE| High or low photovoltaic voltage protection
G8| Overcurrent protection at power grid side
G7| Voltage over/under frequency at the power grid side
G9| Drive IPM module protection at the power grid side
GL| Hardware overcurrent protection at the power grid side
GC| Photovoltaic DC hardware overcurrent protection
GJ| Module high-temperature protection at the power grid side
GP| Temperature sensor protection at the power grid side
G6| Photovoltaic low voltage ride through
Gy| Drive beyond retrieve error at the power grid side
G1| Photovoltaic Anti-islanding protection
G0| Photovoltaic reversed connection protection
GU| Charged circuit protection at the power grid side
GA| Low/high input voltage protection at the power grid side
G2| Photovoltaic DC overcurrent protection
Gb| Relay protection at the power grid side
G3| Photovoltaic power generation overload
Gd| Current sensor protection at the power grid side
GF| DC bus midpoint potential imbalance
Gn| Insulated impedance protection
Error Cod| Error
---|---
G4| Photovoltaic leakage current protection
G5| Phase-lacking protection at the power grid side
q0| Indoor fan bus low-voltage protection
q1| Indoor fan bus high-voltage protection
q2| Indoor fan AC current protection
q3| Indoor fan IPM protection
q4| Indoor fan PFC protection
q5| Indoor fan Startup failure
q6| Indoor fan phase-sequence protection
q7| Indoor fan driver reset protection
q8| Indoor fan over-current protection
q9| Indoor fan power protection
qA| Indoor fan driver current error
qb| Indoor fan driver out-of-step protection
qC| Master control and indoor fan driver communication error
qd| Indoor fan driver module high-temperature protection
qE| Indoor fan driver module sensor error
qF| Indoor fan driver memory chip error
qH| Indoor fan charging loop error
qL| Indoor fan input voltage error
qo| Indoor fan electric box sensor error
qP| Indoor fan zero-crossing protection

GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI
Add: West Jinji Rd, Qianshan, Zhuhai, Guangdong, China, 519070 Tel: (+86-756) 8522218
Fax: (+86-756) 8669426
E-mail: global@cn.gree.com
www.gree.com

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