Gree GRS-2.4/D270ANbA-K User manual

AIR SOURCE HEAT PUMP WATER HEATER
Capacity: 1.5~2.4kW
Rated Frequency: 50Hz
Operation Range : -7℃~45℃

Contents
PRODUCT............................................................................................................................................................. 2
1MODELS LIST .......................................................................................................................................................... 2
2NOMENCLATURE................................................................................................................................................... 3
3FUNCTION................................................................................................................................................................ 3
4PRODUCT PARAMETERS..................................................................................................................................... 4
5WORKING PRINCIPLE.................................................................................................................................................. 7
6OPTIONAL ACCESSORIES ........................................................................................................................................... 8
CONTROL........................................................................................................................................................... 10
1UNIT CONTROL.......................................................................................................................................................... 10
2WIRED CONTROLLER................................................................................................................................................ 11
3QUERY PARAMETERS................................................................................................................................................ 13
4OPERATION INSTRUCTIONS....................................................................................................................................... 14
INSTALLATION................................................................................................................................................... 24
1ENGINEERING INSTALLATION FLOWCHART .............................................................................................................. 24
2PREPARATIONS ......................................................................................................................................................... 25
3INSTALLATION OF THE UNIT OF WATER HEATER...................................................................................................... 28
4PIPE INSULATION....................................................................................................................................................... 40
5ELECTRIC INSTALLATION .......................................................................................................................................... 40
6CHECK FOR ACCEPTANCE AFTER INSTALLATION .................................................................................................... 44
COMMISSIONING AND TRIAL RUN................................................................................................................. 46
1COMMISSIONING FLOWCHART.................................................................................................................................. 46
2PRECAUTIONS ON SAFETY........................................................................................................................................ 46
3PREPARATIONS ......................................................................................................................................................... 46
4COMMISSIONING AND TRIAL RUN............................................................................................................................. 49
5CHECK BEFORE ACCEPTANCE................................................................................................................................. 51
6UNIT FUNCTION SETTING.......................................................................................................................................... 52
MAINTENANCE.................................................................................................................................................. 54
1FAULT CODE.............................................................................................................................................................. 54
2TROUBLESHOOTING.................................................................................................................................................. 55
3REPAIR OF KEY COMPONENTS................................................................................................................................. 58
4EXPLODED VIEW AND PARTS LIST ........................................................................................................................... 62
UNIT MAINTENANCE ........................................................................................................................................ 69
1WATER REPLENISHMENT FOR THE WATER TANK..................................................................................................... 69
2REGULAR CLEANING FOR THE WATER TANK........................................................................................................... 69
3SAFETY VALVE MAINTENANCE ................................................................................................................................. 69
4MAINTENANCE OF THE UNIT ..................................................................................................................................... 70
ATTACHMENT: MAPPING TABLE OF THE TEMPERATURE SENSOR RESISTANCE AND
TEMPERATURE.................................................................................................................................................. 71

GREE AIR SOURCE HEAT PUMP WATER HEATER SERVICE MANUAL
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PRODUCT

GREE AIR SOURCE HEAT PUMP WATER HEATER SERVICE MANUAL
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PRODUCT
1 MODELS LIST
Product type
Model
Product
Code
Heating capacity
(W)
Outline diagram
Integral type
GRS-2.4/D270ANbA-K
ER02100050
2400+1500
(electric heating)
GRS-1.5/D150ANbA-K
GRS-1.5/D200ANbA-K
ER02100070
ER02100080
1500+1500
(electric heating)
GRS-1.5/TD150ANbA-K
GRS-1.5/TD200ANbA-K
ER02100100
ER02100090
1500+1500
(electric heating)
Notes:
①The above table lists specifications of the air source water heater series product for static heat up. The
product standard is EN16147-2011, (EU) No 814/2013, EN 12102-2008.
②Conditions for testing heating capacity of the unit: outdoor ambient temperature: 20°C DB/15°C WB;
Initial/ending water temperature in the water tank: 15°C /55°C .
③For units with a water tank equipped with an electrical heater, that is, the model of which includes ―D ‖,
both the heat pump and electrical heater are started for heat up under low ambient temperature or rapid
mode.
④If the product specification changes with product improvement, refer to the parameter specified on the
nameplate.

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2 NOMENCLATURE
GRS
-
1.5
/
T
D
200
A
Nb
A
-
K
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
No.
Description
Options
1
Product code
GRS—heat pump water heater
2
Heating capacity code
Nominal heating capacity (Unit: kW)
3
Compressor system
Null for single compressor; S—two compressors
4
Functions 1
P—inverter; Pd—DC inverter; M—modular for fixed speed; PM—AC
inverter modular; PdM—DC inverter modular; Null for fixed speed
5
Functions 2
Null for general; Re—Low temp heat pump
6
Material of water tank
Null for stainless steel; T—Porcelain enamel
7
Function code
Null for no electric heating function; D—with electric heating function
8
Water tank capacity
Capacity of water tank; Unit:（L）
9
Design code
A—LCJW: floor standing type; outer coil pipe static heating type;
B—BCJW: wall-mounted type; outer coil pipe static heating type;
C—LCJ: floor standing type; built-in coil pipe static heating type;
D—BCJ: wall-mounted type; built-in coil pipe static heating type;
10
Water tank shape
Null for rotundity; F—squareness
11
Inner tank number
Null for one inner tank; 2—two inner tank
12
Refrigerant
Null for R22; R407c—N; R410A—Na; R134a—Nb; R417A—Ne
13
Design Serial number
A, B, C…or A1, A2…, B1, B2…
14
Cycle function
H—cycle function; Null for no cycle function
15
Power supply code
M—380-415V 3PH~50Hz; K—220V-240V 1PH~50Hz;
D—220V-240V 1PH~60Hz; …
3 FUNCTION
No.
Name
Function
1
Compressor
Increases pressure for the refrigerant and provides driving force for
circular flow of the refrigerant as a main driving component.
2
Four-way valve
Reverses flow direction of the refrigerant when the system
switches between the normal heat up mode and defrosting mode.
3
Water tank
Provides heat exchange channel for refrigerant and water and
stores hot water for daily use.
4
Electronic expansion
valve
Speeds up high-pressure and high-temperature refrigerant and
reduces pressure and adjusts the circulation amount of coolant.
5
Finned tube
exchanger
Provides heat exchange channel for refrigerant and air.
6
Fan motor
Enhances heat exchange on the air side of the finned tube
exchange and provides a low-temperature heat source
continuously.
7
Filter
Filters impurities in refrigerant to protect components with small
diameter.

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4 PRODUCT PARAMETERS
4.1 Product Parameters
Model
GRS-2.4/D270ANbA-K
Rated Heating Capacity(*)
W
2400
Rated Input Power(*)
W
685
COP(*)
W/W
3.50
Capacity
L
270
Load Profile
-
XL
COPDHW(**)
W/W
2.61
Energy Efficiency Class(**)
-
A
Water Heating Energy Efficiency(**)
-
105%
Annual electricity consumption
(average climate conditions)
kWh
1594
Maximum Input Power
W
1300+1500W (Electric Heater)
Outlet Water Temperature
°C
Default: 55°C , 35°C ~70°C
Power Supply
-
220V-240V ~50Hz
Insulation Level
-
Ⅰ
Protection of Ingression
-
ⅠPX4
Refrigerant
Name
R134a
Charge
kg
1.10
Outline Dimensions
W x D x H
mm
660×667×1958
Package Dimensions
W x D x H
mm
813×813×2100
Net Weight
kg
114
Sound Power Level(***)
dB(A)
60
Operating Range
°C
-7~45
Notes:
①(*) Value obtained with the following conditions: Outdoor temperature: 20°C DB /15°C WB; Water
tank temperature (start/end): 15°C /55°C.
②(**)Value obtained with an air temperature of 7°C and a water inlet at 10℃, as per EN16147-2011,
(EU) No 814-2013.
③(***) Value obtained indoor placement, with 2m long inlet and outlet wind duct, as per EN
12102-2008, (EU) No 814-2013.
④The installation of suction and backflow conduits on the heat pump lessens its performance.
⑤Under RAPID function, electric heater helps to heating water.
⑥Please always see the nameplate for the exact data as this table is subject to change.

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Model
GRS-1.5/D150ANbA-K
GRS-1.5/D200ANbA-K
Rated Heating Capacity(*)
W
1500
1500
Rated Input Power(*)
W
429
429
COP(*)
W/W
3.50
3.50
Capacity
L
150
190
Load Profile
-
L
L
COPDHW(**)
W/W
2.47
2.47
Energy Efficiency Class(**)
-
A
A
Water Heating Energy Efficiency(**)
-
103.9%
103.9%
Annual electricity consumption
(average climate conditions)
kWh
985
985
Maximum Input Power
W
650+1500W (Electric Heater)
Outlet Water Temperature
°C
Default: 55°C , 35°C ~70°C
Power Supply
-
220V-240V ~50Hz
Insulation Level
-
Ⅰ
Ⅰ
Protection of Ingression
-
ⅠPX4
ⅠPX4
Refrigerant
Name
R134a
R134a
Charge
kg
0.8
0.8
Outline Dimensions
W×D×H
mm
591×591×1685
591×591×1935
Package Dimensions
W×D×H
mm
703×703×1765
703×703×2015
Gross/Net Weight
kg
88.0/73.5
95.5/79.0
Sound Power Level(***)
dB(A)
61
61
Operating Range
°C
0~45
0~45
Notes:
①(*) Value obtained with the following conditions: Outdoor temperature: 20°C DB /15°C WB; Water
tank temperature (start/end): 15°C /55°C.
②(**) Value obtained with an air temperature of 7°C and a water inlet at 10℃, as per EN16147-2011,
(EU) No 814-2013.
③(***) Value obtained indoor placement, as per EN 12102-2008, (EU) No 814-2013.
④Under Rapid function, electric heater helps to heating water.
⑤Please always see the nameplate for the exact data as this table is subject to change.

GREE AIR SOURCE HEAT PUMP WATER HEATER SERVICE MANUAL
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Model
GRS-1.5/TD150ANbA-K
GRS-1.5/TD200ANbA-K
Rated Heating Capacity(*)
W
1500
1500
Rated Input Power(*)
W
429
429
COP(*)
W/W
3.50
3.50
Capacity
L
150
190
Load Profile
-
L
L
COPDHW(**)
W/W
2.47
2.24
Energy Efficiency Class(**)
-
A
A
Water Heating Energy Efficiency(**)
-
104%
95%
Annual electricity consumption
(average climate conditions)
kWh
985
1075
Maximum Input Power
W
650+1500W (Electric Heater)
Outlet Water Temperature
°C
Default: 55°C , 35°C ~70°C
Power Supply
-
220V-240V ~ 50Hz
Insulation Level
-
Ⅰ
Ⅰ
Protection of Ingression
-
ⅠPX4
ⅠPX4
Refrigerant
Name
R134a
R134a
Charge
kg
0.8
0.8
Outline Dimensions
W×D×H
mm
621×561×1760
621×561×2030
Package Dimensions
W×D×H
mm
731×717×1845
731×717×2110
Gross/Net Weight
kg
112.0/92.0
122.5/102.5
Sound Power Level(***)
dB(A)
62
62
Operating Range
°C
0~45
0~45
Notes:
①(*) Value obtained with the following conditions: Outdoor temperature: 20°C DB/15°C WB; Water
tank temperature (start/end): 15°C /55°C.
②(**) Value obtained with an air temperature of 7°C and a water inlet at 10℃, as per EN16147-2011,
(EU) No 814-2013.
③(***) Value obtained indoor placement, as per EN 12102-2008, (EU) No 814-2013.
④Under Rapid function, electric heater helps to heating water.
⑤Please always see the nameplate for the exact data as this table is subject to change.
4.2 Work Temperature Range
Models
GRS-2.4/D270ANbA-K
GRS-1.5/D150ANbA-K
GRS-1.5/D200ANbA-K
GRS-1.5/TD150ANbA-K
GRS-1.5/TD200ANbA-K
Heating
-7~45°C
0~45°C
0~45°C
Note: The above value range indicates the outdoor ambient temperate range for normal operation of the
unit. For details on the configurable range of water temperature, see the nameplate of the water tank.

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5 Working Principle
5.1 Brief Introduction to Working Principle
As the refrigerant has different phase-transition temperature under varied pressure, it enables the
heat pump to transfer heat of low-temperature heat source to the high-temperature heat source. The air
source water heater unit utilizes the heat pump to obtain heat from the ambient low-grade energy (air
source) via thermodynamic cycle by consuming partial electrical energy, and then delivers heat to the
water tank for heating up water.
5.2 Working Diagram
The compressor consumes partial electrical energy to compress the refrigerant into
high-temperature and high-pressure gas. After entering the condenser (the water tank coil of a water
heater in static heat up mode), the gaseous refrigerant transfers its heat to water as its saturation
temperature is higher than the water temperature and leaves the condenser after condensing into liquid.
The liquid refrigerant enters the throttling device (generally the electronic expansion valve) for speedup
and pressure reduction. As partial liquid vaporizes, the liquid refrigerant has two states (gas and liquid)
when leaving the throttling device. The low-pressure refrigerant enters the vaporizer (the finned tube
exchanger of a water heater in static heat up mode) and is vaporized into liquid after absorbing heat from
air as its saturation temperature is lower than the air temperature. The low-pressure gas is inhaled by the
compressor for the next cycle.

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6 Optional Accessories
The Gree air source water heater unit supports the following accessories:
Item
Model/Coding
Remark
Intelligent preheat water return device
(transient heat up module)
HS-01
Self-regulation heating belt
76612816
Pressure stabilizing valve
07382812
Note:
If any of the preceding accessories is required, contact with the local sales company.

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CONTROL

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CONTROL
1 Unit Control
1.1 Overall Control Logic
(1) High pressure switch
When the detected voltage exceeds the preset value, a fault will be displayed and the unit will stop or
not start.
(2) Temperature sensor fault detection and handling
Once the temperature sensor for the ambient temperature, air discharge, air inhaling, pipe
temperature, or water tank is open-circuited or short-circuited, the corresponding fault code will be
displayed and all loads will be cut off. After the fault is rectified, the unit automatically runs again.
1.2 Key Control Logics
(1) Control on compressor
After power is connected, start the system by the manual operator and detect the outdoor ambient

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temperature sensor. If the outdoor ambient temperature is not lower than -7°C (0°C of
GRS-1.5/D150ANbA-K、GRS-1.5/D200ANbA-K、GRS-1.5/TD150ANbA-K、GRS-1.5/TD200ANbA-K) and
when no fault is detected and start up conditions of the compressor are met, the system starts by following
the hot water sequence.
(2) Control on fan motor
When start up conditions of the compressor are met, the system starts by following the hot water
sequence. The electronic expansion valve resets and is initialized, and the external fan motor starts. After
10s, the compressor starts. The fan motor will determine whether to still run at high level or to run at low
level based on the ambient temperature after it runs at high level. If the system enters overload control,
the fan motor will switch to discontinuous start up and shutdown status at low level.
(3) Control on defrosting
When the compressor is initially powered on and started, it determines the defrosting condition after
running for the preset duration. If the defrosting condition is met, the system defrosts before running in hot
water mode (including freeze-proofing operation of compressor). After defrosting is over, the compressor
starts for heat up. When the cumulative operation time exceeds or equals to the preset time for defrosting,
defrosting will be performed if the relation between the outdoor exchanger pipe temperature sensor Th
and the outdoor ambient temperature sensor Te meets the defrosting condition.
(4) Control on freeze-proofing function
In the Off state, if water temperature in the water tank detected by the system based on the ambient
temperature is too low, the unit starts the freeze-proofing function immediately.
2 Wired Controller
(1) Controller for GRS-2.4/D270ANbA-K:
1
i-know button
2
Timer button
3
Function button
4
Rapid button
5
Mode button
6
Increase button
7
On/Off button
8
Decrease button

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1
Display of Common Operation Modes:
HOTWATER, SAVE, PRESET and
NIGHT mode.
6
Display of defrost, antifreeze running, and
e-heater running (or display of the Special
E-HEATER Mode).
2
Display of RAPID and i-know function.
7
Display of hot water volume (this function is
unavailable to models with single temperature
sensor).
3
Display of CYCLE, STERILIZE,
SUNFLOWER, ABSENCE, VACATION,
and ONCE function (the STERILIZE
function may not work for models without
an electrical heater).
8
Display of operating/standby.
4
Display of Keypad Lock function.
9
Display of actual water temperature, temperature
setpoint, error codes, and running parameters.
5
Display of system time, preset time,
timer setting and running parameters.
10
Display of the sub-controller. (This function is
reserved.)
(2) Controller for GRS-1.5/D150ANbA-K, GRS-1.5/D200ANbA-K, GRS-1.5/TD150ANbA-K,
GRS-1.5/TD200ANbA-K:
1
Rapid button
2
Timer button
3
Increase button
4
Mode button
5
i-know button
6
Function button
7
Decrease button
8
On/Off button

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1
Display of Common Operation Modes:
HOTWATER, SAVE, PRESET and
NIGHT mode.
7
Display of Keypad Lock function.
2
Display of actual water temperature,
temperature setpoint, error codes, and
running parameters.
8
Display of defrost running
3
Display of system time, preset time,
timer setting and running parameters.
9
Display of antifreeze running
4
Display of hot water volume (this
function is unavailable to models with
single temperature sensor).
10
Display of e-heater running
5
Display of the sub-controller. (This
function is reserved.)
11
Display of CYCLE, HOTTER,
SUNFLOWER, STAYOUT and VACATION
function (the HOTTER function may not work for
models without an electrical heater).
6
Display of operating/standby.
12
Display of RAPID and i-know function.
3 Query Parameters
This function is provided for the debugging personnel to query running status of the unit. After
pressing and holding MODE+▲button for 5s, the parameter display area blinks. 00 is displayed by default.
The ▲ and ▼ buttons can be pressed to switch the query item.
Query codes are described in the following table.
Query Code
Query Parameter
00
00 by default
01
Communication protocol version
03
Temperature of the upper temperature sensor of the water tank (detected by the mainboard)
04
Temperature of the outdoor ambient temperature sensor
06
Temperature of the air intake temperature sensor
08
Temperature of the air exhaust temperature sensor
13
Temperature of the temperature sensor for outdoor pipe
16
Temperature of the lower temperature sensor of the water tank (detected by the mainboard)
17
Display of single or dual temperature sensor (01 indicates single temperature sensor and 02
indicates dual temperature sensor)

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4 Operation Instructions
4.1 On/Off Setting
The unit will be started or stopped by pressing the ―On/Off ‖ button.
Note: After energization and under normal communication, the LCD will display the water temperature,
time, and hot water volume (for models with dual temperature sensor) under both On and Off states of the
unit. It means the Off state if the LCD does not display the running mode, as shown in the following figure.
4.2 Common Modes Setting
In the On state of the unit, press the MODE button to switch the operation modes in the following
sequence:
HOTWATER SAVE PRESET NIGHT
The HOTWATER mode is shown in the following figure.
4.3 Special Modes Setting
If the heat pump of a water heater equipped with an electrical heater is faulty, users can press and
hold MODE+RAPID for 5s in any mode under the state to enter the E-HEATER mode.
Note: The E-HEATER mode can be used only when the heat pump is faulty. In this case, contact the

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aftersales service immediately.
The E-HEATER mode is shown in the following figure.
In the E-HEATER mode, users can press the MODE button to switch to the HOTWATER mode. Note
that the E-HEATER mode will be cancelled automatically and the HOTWATER mode will be started upon
restart of the water heater in the case of blackout.
4.4 Water Temperature Setting
In the On state, press ▲ to increase or press ▼ to decrease the temperature setpoint. The water
temperature will increase or decrease continuously by 1°C when the button is pressed and held.
The minimum temperature setpoint for all models is 35°C. The maximum temperature setpoint can be
set to 70°C.
4.5 Time Setting
4.5.1 System Time Setting
In the main interface, press and hold the TIMER button for 5s. The system time setting interface is
displayed. The clock icon is on and the hour value blinks. Press ▲ or ▼ to adjust the hour value and
press the TIMER button to confirm setting. Then the minute value flickers. Press ▲ or ▼ to adjust the
minute value and press the TIMER button to confirm setting. After system time setting is saved, the main
interface is displayed. In the setting process, if no button is pressed within 15s, the main interface will be
displayed and setting will not be saved.
The system time ranges from 00:00 to 23:59. Each time you press ▲ or ▼, the time increases or
decreases by 1 hour or 1 minute. When the button is pressed and held, the time increases or decreases
continuously by 1 hour or 1 minute.
The setting process is shown in the following figure.
Main interface Hour value of the
system time
blinks.
Minute value of
the system time
blinks.
Press and hold the
TIMER button. Press the TIMER
button.
Press ▲or ▼to
adjust the value.
Press ▲or ▼to
adjust the value.
Press the TIMER
button. Setting is complete.

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4.5.2 Timer Setting
Timer setting: Under the HOTWATER or SAVE mode or under the Off state, press the TIMER
button to enter the timer setting interface. The TIMER and ON icons are on and the hour value blinks.
Press ▲ or ▼ to adjust the hour value and press the TIMER button to confirm setting. Then the minute
value flickers. Press ▲ or ▼ to adjust the minute value and press the TIMER button to confirm setting.
Then the OFF icon is on and ON icon is off. The hour value blinks. Press ▲ or ▼ to adjust the hour value
and press the TIMER button to confirm setting. Then the minute value flickers. Press ▲ or ▼ to adjust the
minute value and press the TIMER button to confirm setting. After the scheduled on/off time setting is
saved, the main interface is displayed. In the setting process, if no button is pressed within 15s, the main
interface will be displayed and setting will not be saved.
Timer cancelling: After the scheduled on/off time is set, press the TIMER button to cancel it.
Note: The scheduled on time and off time cannot be the same; otherwise, the LCD switches to the
interface for resetting the timer.
4.5.3 Preset Time Setting
In the PRESET mode, hot water is prepared in advance by the preset time.
In the main interface of the PRESET mode, press the TIMER button to enter the selection interface.
PRESET 1 blinks while PRESET 2 and PRESET 3 are not displayed. Press ▲ or ▼ and the LCD blinks

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circularly in the flowing sequence: PRESET 1 –PRESET 2 –PRESET 3 –PRESET 1.
Preset time setting: Press the TIMER button to select PRESET 1. Then the PRESET 1 icon is on
and the hour value blinks. Press ▲ or ▼ to adjust the hour value and press the TIMER button to confirm
setting. Then the minute value flickers. Press ▲ or ▼ to adjust the minute value and press the TIMER
button to confirm setting. After time setting for PRESET 1 is saved, the main interface is displayed.
PRESET 2 or PRESET 3 setting: Press the TIMER button to select PRESET 2 and then the ON icon
blinks. Press ▲ or ▼ to switch the ON and OFF icons. When the ON icon blinks, press the TIMER button.
Then the PRESET 2 icon is on and the ON icon is off. The hour value blinks. Press ▲ or ▼ to adjust the
hour value and press the TIMER button to confirm setting. Then the minute value flickers. Press ▲ or ▼
to adjust the minute value and press the TIMER button to confirm setting. After time setting for PRESET 2
is saved, the main interface is displayed. The method for setting PRESET 3 is the same as that for
PRESET 2. (After setting is saved, the ON and OFF icons are not displayed in the main interface as these
icons are available in the setting process.)
In the time presetting process, if no button is pressed within 15s, the preset interface will switch to the
main interface automatically and setting will not be saved.
If the time preset for PRESET 1, PRESET 2, and PRESET 3 is the same, it is regarded as one timer.
The preset time can be memorized. If the preset time does not need to be reset, users only need to
select on or off.
Preset time cancelling: After time is preset for PRESET 2 or PRESET 3, users can press the TIMER
button to display the selection interface. The icon of PRESET 2 blinks. Press ▲ or ▼ and the LCD blinks
circularly in the flowing sequence: PRESET 2 –PRESET 3 –PRESET 1 –PRESET 2. Select PRESET 2
and press the TIMER button. Select to cancel PRESET 2. Then the PRESET 2 icon is on and the ON icon
blinks. Press ▲ or ▼ to select OFF. Press the TIMER button to confirm cancelling and return to the main
interface. The method for cancelling preset time for PRESET 3 is the same as that for PRESET 2. Preset
time for PRESET 1 cannot be cancelled. If users select PRESET 1, the time setting interface will be
displayed.

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Main interface PRESET 1
blinks.
The ON icon
blinks.
Press the
TIMER button. Press ▲or ▼to select
PRESET X
The hour value
of PRESET X
blinks.
Press ▲or ▼to
adjust the value.
Press the
TIMER button.
The minute
value of
PRESET X
blinks.
Press the TIMER button.
Press the TIMER button.
The OFF icon
blinks.
PRESET 1 or
PRESET 3
blinks.
Press the TIMER button.
Press the TIMER button.
Press ▲or ▼to adjust
the value.
Press the
TIMER button.
Press ▲or ▼to
select on or off.
Setting is complete
and PRESET X is
canceled.
Setting is
complete and
PRESET X is
started.
The PRESET mode runs circularly. The water heater starts to heat up water based on the preset time
and ambient temperature and stops one hour after the preset time.
4.6 Function Setting
4.6.1 i-know
In the on state, press the i-know button to select the i-know function. To cancel this function, press
the i-know button again.
4.6.2 RAPID
In the on state, press the RAPID button to select the RAPID function. The electrical heater is started
for heat up. To cancel this function, press the RAPID button again. Then electrical heater is stopped.
Under the E-HEATER mode, users can press the RAPID button to switch to the HOTWATER mode.
To return to the E-HEATER mode, press the RAPID button again.
4.6.3 SUNFLOWER, ABSENCE, and ONCE
In the on state, press the FUNCTION button to enter the interface for selecting among the
SUNFLOWER, ABSENCE, and ONCE functions. When a function is selected, the corresponding icon