Gree ForestAir Series User manual

IMPORTANT : Please read this manual
carefully before running this unit, and
save it for future reference.
© Copyright, Gree Canada, 2019
GRFA-OM-ATW-3694 - v1.5 - 06/2019
Operation Manual
Versati Air-to-Water Heat Pump
Series

3
FOREWORD
Air conditioners, heat pumps and dehumidiers are pieces of high value. ln order to ensure your lawful
rights and interests, if you are not familiar with the installation of this type of appliance, please have
a professional technician do the installation for you. This instruction manual is the universal-purpose
version for the ForestAir series VERSATI Split Air-to-Water Heat Pump manufactured by Gree. The
appearance of the unit that you have purchased may differ from the ones seen in this manual, however
it does not change the basic instructions on how to operate and use the appliance.
To ensure satisfactory operation for many years to come, this manual should be read carefully before
installing the appliance. After reading, store in a safe place. Please refer to the manual for questions on
use or in the event that any irregularities occur.

4
SAFETY PRECAUTIONS
CAUTION
Make sure the control is installed in a
location where it will not be subjected to
electromagnetic interference. Shielded twisted
pairs should be used for signal lines and
other communication lines.
Be sure the communication lines are wired
to the correct ports, otherwise normal
communications will fail.
Do not expose the control to direct sunlight.
Do not install the control in a damp area.
Do not beat or toss the control.
Avoid frequently disassembling and
reassembling the control.
Do not operate the control with wet hands.

5
TABLE OF CONTENT
1.0. CONTROL PANEL AND INTERFACE OVERVIEW
1.1. Control panel keys and indicators.....................................................................................................6
1.2. Interface standby and home pages ..................................................................................................8
2.0. OPERATION GUIDE
2.1. Power ON/OFF................................................................................................................................10
2.2. Function setting................................................................................................................................ 11
2.2.1. Running mode.........................................................................................................................14
2.2.2. Control state ............................................................................................................................14
2.2.3. Fast hot water..........................................................................................................................14
2.2.4. T-water control.........................................................................................................................15
2.2.5. Cooling and hot water .............................................................................................................15
2.2.6. Heating and hot water .............................................................................................................16
2.2.7. Quiet mode..............................................................................................................................16
2.2.8. Quiet timer ...............................................................................................................................16
2.2.9. Weather-dependent mode......................................................................................................17
2.2.10. Holiday release......................................................................................................................17
2.2.11. Disinfection ............................................................................................................................18
2.2.12. Weekly timer..........................................................................................................................19
2.2.13. Clock timer.............................................................................................................................21
2.2.14. Temperature timer .................................................................................................................22
2.2.15. Solar kit..................................................................................................................................23
2.2.16. Floor debug ...........................................................................................................................24
2.2.17. Emergency mode..................................................................................................................25
2.2.18. Holiday mode ........................................................................................................................26
2.2.19. Thermostat ............................................................................................................................26
2.2.20. Assistant heater.....................................................................................................................27
2.2.21. Other heater ..........................................................................................................................27
2.2.22. Chassis heater ......................................................................................................................27
2.2.23. Tank heater............................................................................................................................27
2.2.24. Solar antifreeze .....................................................................................................................28
2.2.25. Water tank .............................................................................................................................28
2.2.26. Tank sensor ...........................................................................................................................28
2.2.27. Solar heater...........................................................................................................................28
2.2.28. Floor cong............................................................................................................................28
2.2.29. Remote sensor......................................................................................................................29
2.2.30. Air removal.............................................................................................................................29
2.2.31. Address..................................................................................................................................29
2.2.32. Gate-controller.......................................................................................................................30
2.3. Parameters setting...........................................................................................................................30
2.3.1. User parameters......................................................................................................................30
2.3.2. Weather-dependent mode group ...........................................................................................33
2.4. View pages ......................................................................................................................................34
2.4.1. Status.......................................................................................................................................34
2.4.2. Parameter................................................................................................................................36
2.4.3. Error .........................................................................................................................................37
2.4.4. Version.....................................................................................................................................39
2.5. General setting.................................................................................................................................39
2.5.1. Time and date setting..............................................................................................................40
2.6. Key lock............................................................................................................................................41

6
1.0. CONTROL PANEL AND INTERFACE OVERVIEW
█ 1.1. CONTROL PANEL KEYS AND INDICATORS
1
9
2
10
3
11 12 13 14 15
4
7
6
8
5
Note : This illustration is for reference only.

7
1.0. CONTROL PANEL AND INTERFACE OVERVIEW
# ICON KEY/INDICATOR DESCRIPTION
1Running indicator
(green) Lights on/off when the unit is turned on/off.
2Power indicator
(yellow) Lights on/off when the unit is powered on/off.
3Error indicator (red) Lights on when some fault occurs.
4Left key Moves the selection left.
5Up key Modies the setting or value of the selected
parameter.
6Right key Moves the selection right.
7Down key Modies the setting or value of the selected
parameter.
8Menu key Calls out the main menu or returns to the home
page.
9Function 1 key
Performs different functions at difference pages.
10
Function 2 key
11
Function 3 key
12
Function 4 key
13
OK key Saves the setting or enters a submenu.
14
Cancel / Return key Returns to a higher menu level or cancels saving.
15
ON / OFF key Turns the unit on or off.
Note : The key icons is for reference only. The icons on the actual unit always prevails.

8
1.0. CONTROL PANEL AND INTERFACE OVERVIEW
█ 1.2. INTERFACE STANDBY AND HOME PAGES
Standby Page
# ITEM DESCRIPTION
1Mode Displays the currently running mode.
2Auxiliary Function Indicates whether there are any auxiliary functions currently set.
3Error State Indicates whether there is any error currently affecting the system.
4T-Water Out Displays the current leaving water temperature.
5T-Outdoor Displays the current outdoor ambient temperature.
6Key Lock Indicates whether the key lock function is on or off.
1 3
2
4 6
5

9
1.0. CONTROL PANEL AND INTERFACE OVERVIEW
# ITEM DESCRIPTION
7FUNCTION Allows access to the Function page.
8PARAMETER Allows access to the Parameter page.
9VIEW Allows access to the View page.
10
GENERAL Allows access to the General page.
Home Page
7 8 9 10

10
2.0. OPERATION GUIDE
█ 2.1. POWER ON/OFF
Allows to turn the appliance on or off.
Operation Instructions
On the HOME page, press the Power key to turn the unit on or off. When the unit is turned on,
the running indicator located in the upper right corner of the control panel turns green. When the unit
is turned off, the running indicator lights off.
Notes :
▪ The unit is OFF by default when energized for the rst time.
▪ The unit can only be switched on or off on the HOME or STANDBY page.
▪ If Holiday or Emergency modes are enabled, the Power key becomes inoperative.
▪ When the Forced Heating or Forced Cooling modes are activated, they can only be deactivated by
pressing the Power key. Press the button again to turn the unit on.
▪ The ON/OFF Memory setting of the power function can be changed on the GENERAL setting
page. In the event of a power failure, if set to ON, the unit will resume operation once the power is
restored. If set to OFF, the unit will remain off.
▪ On the HOME page, the Power key is used to turn the unit on and off, if applicable. The
Function keys 1 to 4 correspond to the FUNCTION, PARAMETER, VIEW and GENERAL pages
respectively.
▪ On the STANDBY page, the Menu key is used to return to the HOME page, the Power key
is used to turn the unit on or off, if applicable, and all other keys are inoperative.
▪ The interface automatically returns to the HOME page if there is no activity for 10 consecutive
minutes.

11
2.0. OPERATION GUIDE
█ 2.2. FUNCTIONS
Allows the user to set each function.
Operation Instructions
1. On the HOME page, press the Function 1 key to access the FUNCTION page.
2. Once on the FUNCTION page, move the selection to the desired function using the Left and
Right keys. Use the Function 3 and Function 4 keys to move to subsequent pages and
access more functions. Once located, modify the setting using the Up and Down keys.
3. Once the setting changes are completed, press the Menu key to return to the HOME page, or
the Return key to return to a higher menu level.
Notes :
▪ Some functions have submenus that must be accessed in order to change parameters. The option
“Enter” will appear in the lower left corner of the interface screen when such a function is selected. To
enter the submenu, simply press the OK key.
▪ When the setting of a function is changed, it is automatically memorized to allow its recovery following
a power failure, unless otherwise specied.

12
Function Setting Options
ITEM RANGE DEFAULT REMARKS
Running Mode
Cool / Heat / Hot Water /
Cool + Hot Water /
Heat + Hot Water
Heat If no water tank is available, Cool and Heat are the
only options.
Control State T-Water Out /
T-Room T-Water Out T-Room is only available when the Remote Sensor is
set to With.
Fast Hot Water ON / OFF OFF If no water tank is available, this function will be
marked as “Reserved”.
T-Water Control High / Normal Normal
If Floor Cong is set to With, this function is
automatically set to Normal and cannot be modied.
If Floor Cong is set to Without, this function can be
modied.
Cool + Hot Water Cool / Hot Water Cool If no water tank is available, this function will be
marked as “Reserved”.
Heat + Hot Water Heat / Hot Water Heat If no water tank is available, this function will be
marked as “Reserved”.
Quiet Mode ON / OFF OFF /
Quiet Timer ON / OFF OFF /
Weather-dependent
Mode ON / OFF OFF /
Holiday Release ON / OFF OFF /
Disinfection ON / OFF OFF If no water tank is available, this function will be
marked as “Reserved”.
Weekly Timer ON / OFF OFF /
Clock Timer ON / OFF OFF /
Temperature Timer ON / OFF OFF /
Solar Kit ON / OFF / Timer OFF
If no water tank is available, this function will be
marked as “Reserved”.
If set to ON, the solar kit will operate at all times,
whether a timer has been set or not.
If set to OFF, the solar heating function is unavailable.
If set to Timer, the solar kit will only operate when
activated by a ser timer.
Floor Debug ON / OFF OFF /
Emergency Mode ON / OFF OFF /
Holiday Mode ON / OFF OFF /
2.0. OPERATION GUIDE

13
Thermostat Air / Without /
Air + Hot Water Without
This setting cannot be changed directly from Air to
Air + Hot Water or vice versa. Without must rst be
selected after which the control will send out Without
command for 40 consecutive seconds (longer than
a communication error). Only after this delay can the
ON command be executed.
If set to Air + Hot Water, hot water can be performed
even if the thermostat is off.
Assistant Heater 1 / 2 / OFF OFF /
Other Heater With / Without Without /
Chassis Heater ON / OFF OFF /
Tank Heater ON / OFF OFF
If no water tank is available, this function will be
marked as “Reserved”.
If a solar kit is available and this function is set to
OFF, the water tank temperature can be adjusted.
If a solar kit is unavailable, the top limit of the water
tank temperature should be set to 50 °C (122 °F).
Solar Kit Antifreeze ON / OFF OFF /
Water Tank With / Without Without /
Tank Sensor 1 / 2 2 If no water tank is available, this function will be
marked as “Reserved”.
Solar Heater With / Without Without /
Floor Cong With / Without With
In heating mode, if set to With, T-Water Control is
automatically set to Normal and cannot be modied. If
set to Without, T-Water Control can be modied.
In cooling mode, if set to With, the leaving water
temperature can be adjusted within a range of 18 to
25 °C (64 to 77 °F), 18 °C (64 °F) being the default
value. If set to Without, the leaving water temperature
can be adjusted within a range of 7 to 25 °C (45 to
77 °F), 7 °C (45 °F) being the default value.
This function is unavailable if the unit is turned off.
Remote Sensor With / Without Without If set to Without, Control State is automatically
changed to T-Water Out.
Air Removal ON / OFF OFF /
Address 1–125 and 127–253 1 /
Gate-Controller ON / OFF OFF /
2.0. OPERATION GUIDE

14
2.0. OPERATION GUIDE
2.2.1 – RUNNING MODE
Allows the user to select the operation mode of the unit.
If no water tank is available, the only allowed running modes will be Cooling and Heating. If a water
tank is available and Water Tank has been set to With (see section 2.2.26), the allowed running modes
will include Cooling, Heating, Hot Water, Heating + Hot Water, and Cooling + Hot Water. The priority
order of operations of the combined running mode Heating + Hot Water or Cooling + Hot Water can be
changed (see sections 2.2.5 and 2.2.6 for more details).
Operation Instructions
With the equipment turned off, access the FUNCTION page, then locate Mode. Select the desired
running mode using the Up and Down keys.
Notes :
▪ Heating mode is set by default when the unit is rst energized.
▪ The setting of this function can only be changed if the unit is turned off. If attempts to change the
operation mode are done while the unit is running, the message “Please turn off the system rst” will
appear on screen.
▪ For the heat pump model, Cooling and Cooling + Hot Water modes are available, but not for the
heating only model.
▪ This setting is memorized to allow its recovery following a power failure.
2.2.2 – CONTROL STATE
Allows the user to set the system’s control state.
Operation Instructions
Access the FUNCTION page, then locate Control State. Set to T-Water Out or T-Room using the Up
and Down keys.
Notes :
▪ If Remote Sensor is set to With, both T-Water Out and T-Room will be available. If Remote Sensor is
set to Without, only T-Water Out will be available.
▪ This setting is memorized to allow its recovery following a power failure.
2.2.3 – FAST HOT WATER
Allows the heat pump and the water tank heater to work together to generate sanitary hot water as
quickly as possible to answer an urgent demand.
Operation Instructions
Access the FUNCTION page, then locate Fast Hot Water. Set to ON or OFF using the Up and
Down keys.
Notes :
▪ This function only works if a water tank is available and Water Tank is set to With.
▪ This setting is memorized to allow its recovery following a power failure.

15
2.0. OPERATION GUIDE
2.2.4 – T-WATER CONTROL
Allows to user to set system’s water temperature control for heating.
Operation Instructions
After setting Floor Cong to Without (see section 2.2.28), access the FUNCTION page, then locate
T-Water Control. Set the temperature to High or Normal using the Up and Down keys.
Notes :
▪ If Floor Cong is left to With (see section 2.2.28), T-Water Control will be set to Normal water
temperature by default and cannot be changed. If Floor Cong is set to Without (see section 2.2.28),
T-Water Control can be set to either High or Normal temperature.
▪ This unit can be connected to a oor coil, fan coil unit and radiator. When a fan coil is used for
cooling, Floor Cong should be set manually to Without to get lower leaving water temperature.
When a radiator is used for heating, Floor Cong should also be set manually to Without to get higher
leaving water temperature.
▪ This setting is memorized to allow its recovery following a power failure.
▪ When this setting is changed, the following parameters return to their default values.
ITEM DESCRIPTION DEFAULT
WOT-Cool Leaving water temperature for cooling. Low 7 °C (45 °F)
Normal 18 °C (64.8 °F)
WOT-Heat Leaving water temperature for heating. High 45 °C (113 °F)
Normal 35 °C (95 °F)
Upper WT-Heat Upper limit of the leaving water temperature for heating in Weather-
dependent mode.
High 48 °C (118 °F)
Normal 35 °C (95 °F)
Lower WT-Heat Lower limit of the leaving water temperature for heating in Weather-
dependent mode.
High 40 °C (104 °F)
Normal 29 °C (84 °F)
2.2.5 – COOLING AND HOT WATER
Allows the user to assign priority to the operating function of his choice, between cooling or heating
water, when using the combined running mode Cooling + Hot Water.
Operation Instructions
Access the FUNCTION page, then locate Cooling + Hot Water. Set the priority to Cooling or Hot Water
using the Up and Down keys.
Notes :
▪ Hot Water can only be given priority if a water tank is available, otherwise it will be marked as “Reserved”.
▪ This setting is memorized to allow its recovery following a power failure.

16
2.0. OPERATION GUIDE
2.2.6 – HEATING AND HOT WATER
Allows the user to assign priority to the operating function of his choice, between cooling or heating
water, when using the combined running mode Heating + Hot Water.
Operation Instructions
Access the FUNCTION page, then locate Heating + Hot Water. Set the priority to Heating or Hot Water
using the Up and Down keys.
Notes :
▪ Hot Water can only be given priority if a water tank is available, otherwise it will be marked as “Reserved”.
▪ This setting is memorized to allow its recovery following a power failure.
2.2.7 – QUIET MODE
Allows the unit to reduce operation noise.
Operation Instructions
Access the FUNCTION page, then locate Quiet Mode. Set to ON or OFF using the Up and Down
keys.
Notes :
▪ If activated, the sound level of both the compressor and fan will be reduced, however the capacity of
the unit will also decrease as a result.
▪This function can be set ON or OFF whether the unit is running or not.
▪ Once activated, it can only be deactivated manually or through the use of the Quiet Timer function.
▪ This setting is memorized to allow its recovery following a power failure.
▪ Turning off the unit will deactivate this function.
2.2.8 – QUIET TIMER
Allows the activation of Quiet Mode at specic periods of the day when operation noise need to be
reduced.
Operation Instructions
1. Access the FUNCTION page, then locate Quiet Timer. Enter the submenu by pressing the OK key.
2. In the submenu, select the parameter Start Time or End Time using the Left and Right keys,
then set the time value using the Up and Down keys.

17
2.0. OPERATION GUIDE
3. When nished, save by pressing the Function 2 key. A message will appear on screen asking
if you are sure you want to save these settings. If you are, press the OK key. If not, press the
Cancel key.
4. Once the settings are saved, the interface will return to the FUNCTION page with the selection on
Quiet Timer. Set to ON or OFF using the Up and Down keys.
Notes :
▪ Once activated, it can only be deactivated manually.
▪ This setting is memorized to allow its recovery following a power failure.
▪Start Time and End Time parameters are memorized to allow their recovery following a power failure.
▪This function can be set to ON or OFF whether the unit is running or not.
2.2.9 – WEATHER-DEPENDENT MODE
Allows the unit to automatically adjusts the leaving water and room temperature based on the outside
temperature when living in areas with signicant temperature variations throughout the day.
Operation Instructions
Access the FUNCTION page, then locate Weather-dependent mode. Set to ON or OFF using the Up
and Down keys. See section 2.3.2 for more details on this function.
Notes :
▪ Once activated, it can only be deactivated manually.
▪ This setting is memorized to allow its recovery following a power failure.
▪ Once enabled, it is possible to check the temperature setpoint of the Weather-dependent mode on the
PARAMETER view page.
▪ Once successfully set, the function will automatically adjust the room temperature. The temperature
setpoint will be ignored. If the function is deactivated, the unit will revert to normal operation according
to the temperature setpoint.
▪This function can be set ON or OFF whether the unit is running or not, but will only take effect once
the unit is in operation.
▪ This function only works in Heating or Cooling running modes.
2.2.10 – HOLIDAY RELEASE
Allows to pause the unit’s operation at specic periods when the user is absent.
Operation Instructions
Access the FUNCTION page, then locate Holiday Release. Set to ON or OFF using the Up and
Down keys.
Notes :
▪ If this function is enabled and a day of the week is set to Holiday when setting a Weekly Timer, the
timer will be disabled for that particular day.
▪ This setting is memorized to allow its recovery following a power failure.

18
2.2.11 – DISINFECTION
Allows the weekly sanitization of the water tank by raising the water temperature to 70 °C (158 °F)
effectively killing legionella bacterias.
Operation Instructions
1.
Access the FUNCTION page, then locate Disinfection. Enter the submenu by pressing the OK key .
2. In the submenu, select the desired parameter using the Left and Right keys, then modify the
setting using the Up and Down keys.
3. When nished, save by pressing the Function 2 key. A message will appear on screen asking
if you are sure you want to save these settings. If you are, press the OK key. If not, press the
Cancel key.
4. Once the settings are saved, the interface will return to the FUNCTION page with the selection on
Disinfection. Set to ON or OFF using the Up and Down keys.
ITEM DESCRIPTION DEFAULT RANGE
Set Temp Water temperature for sanitization 70 °C (158 °F) 45 °C – 70 °C (113 – 158 °F)
Notes :
▪ This function only works if a water tank is available and Water Tank is set to With.
▪This function can be set ON or OFF no matter if the unit is running or not.
▪ Once successfully set, Emergency, Holiday and Floor Debug modes cannot be activated. If attempts
to activate these functions are made while the unit is running in Disinfection mode, the message
“Please disable the Disinfection Mode!” will appear on screen.
▪Even if Disinfection is activated, water heating functions always takes precedence.
▪ Once enabled, “Disinfection” will show on the HOME page of the interface until the process is
completed. If the process fails to complete normally, the warning “Disinfect fail” will appear on screen.
Press any key to clear this message.
▪ If an indoor unit communication error or water tank heater error occurs during the sanitization
process, the function will be automatically interrupted.
2.0. OPERATION GUIDE

19
2.2.12 – WEEKLY TIMER
Allows the user to set a specic operation mode for dened periods within a week according to his
preferences.
Operation Instructions
1.
Access the FUNCTION page, then locate Weekly Timer. Enter the submenu by pressing the OK key .
2. In the submenu, select the desired day of the week using the Left and Right keys. Set the day
to Enabled ( ), Disabled (X) or Holiday using the Up and Down keys. When nished, press
the OK key to enter the submenu of the selected day.
Notes :
▪Enabled ( ) : If Weekly Timer is activated, the timer for that specic day will be operative and will not
be affected by Holiday Release.
▪Disabled (X) : Even if Weekly Timer is activated, the timer for that specic day will be inoperative.
▪Holiday : If Weekly Timer is activated, but Holiday Release is not, then the timer for that specic day
will be operative as normal. However, if Holiday Release is also activated, then the timer for that day
will be inoperative.
3. In the submenu, set the appropriate running mode (Mode), temperature setpoint (WT-Heat) and water
tank temperature (T-Water Tank). The running modes include Heating, Cooling, Hot Water, Heating
+ Hot Water, Cooling + Hot Water (the last three being only available if a water tank is available and
Water Tank is set to With). There are a total of ve programmable periods for each day, and each
period can be set to Enabled ( ) or Disabled (X) depending on the need. Each period can be attributed
a Start Time and End Time parameter.
2.0. OPERATION GUIDE

20
2.0. OPERATION GUIDE
4. When nished, save by pressing the Function 2 key. A message will appear on screen asking
if you are sure you want to save these settings. If you are, press the OK key. If not, press the
Cancel key.
5. Once the settings are saved, the interface will return to the FUNCTION page with the selection on
Weekly Timer. Set to ON or OFF using the Up and Down keys.
Notes :
▪ A total of ve periods can be set for each day. Each period’s Start Time must be prior to its End Time.
Similarly, the preceding period must be prior to the following period.
▪ Once successfully set, changing the setting of Floor Cong, Water Tank, Control State or T-Water
Control will automatically cause the temperature setpoint of the Weekly Timer to change to the previous
setting. For example, if Weekly Timer Mode, Floor Cong and WOT-Heat parameters are set to Heating
With and 35 °C (95 °F) respectively, changing Floor Cong to Without will cause the Weekly Timer WOT-
Heat parameter to change to the previous setting. In this case, if Floor Cong was previously set to
Without, then WOT-Heat will automatically change to 45 °C (113 °F), the default value. Once activated,
WOT-Heat can only be changed in Weekly Timer and no longer on the PARAMETER setting page.
▪If a Weekly Timer using Hot Water, Heating + Hot Water or Cooling + Hot Water mode has been set
and activated, and the Water Tank parameter is subsequently changed from With to Without, the
control will automatically replace Hot Water and Heating + Hot Water with Heating and Cooling + Hot
Water with Cooling in the timer settings.
▪The control is able to decide the temperature type and temperature range based on the current Clock
Timer, Floor Cong, T-Water Control, and Control State settings. If set to Hot Water, the temperature
setpoint will display nothing, indicating there is no need to set T-Water Out or T-Room, but requires
the T-Water Tank parameter. If set to Cooling or Heating, then the water tank temperature will display
nothing, indicating there is no need to set T-Water Tank.