Gree GRS-2.4/D270ANbA-K Manual

Installation and service manual
Models:
GRS-2.4/D270ANbA-K
Thank you for choosing Air Source Heat Pump Water Heater, 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 email to [e-mail] or electronic version.
GREE reserves the right to interpret this manual which will be subject to any change due to product
improvement without further notice.
GREE Electric Appliances, Inc. of Zhuhai reserves the final right to interpret this manual.
Air Source Heat Pump Water
Heater

User Notice
Thank you for selecting Gree air source water heater.
In order to operate the product safety, please read this manual carefully before
installation and operation and pay more attention for the notices for operation and
maintenance. Meanwhile, please keep this manual well for future reference.
Air source water heater is a kind of professional household electric appliances.
Improper installation may cause damage or risk. Therefore, the installation and
maintenance must be conducted by the professional person. User can contact with
the appointed local installation service center. Before installation, please read the
part of installation on this manual carefully and then install the unit according to the
instruction strictly. The interpretation for this manual is owned by the Gree Electric
Appliances Inc. of Zhuhai, which is subject to change without prior notice.
The air source water heater is a kind of heat storage type water heater. When
you are using the water, please turn on the cold water valve at first, adjust the flow
volume of cold water and hot water and then adjust the water to the proper water
temperature to prevent scalding. If you don’t use this water heater for a short time in
winter, please keep this unit is energized for 24hours a day. If you won’t use this unit
for a long time, please drain out the water inside water tank and pipeline to prevent
damage. If the water can’t be drained out smoothly, please contact our companies’
dealer or appointed service center. Our company will send professional person to
provide you with checking, debugging, clean and maintenance service.
This instruction manual is the operation and installation instruction manual for
the vertical coil type air source water heater. As for the operation method for the
wired controller, please refer to the equipped instruction manual for the wired
controller.

Contents
1 Safety instructions and recommendations..................................... 1
1.1 Symbols used........................................................................................ 1
1.2 Safety instructions and recommendations........................................ 2
2 Technical description ........................................................................ 5
2.1 general description............................................................................... 5
2.2 Main parts.............................................................................................. 6
2.3 Operating principle............................................................................... 8
2.4 Technical specifications....................................................................... 9
3 Installation ........................................................................................ 10
3.1 Important hint ...................................................................................... 10
3.2 Basic requirement for the installation position................................ 11
3.3 Selection for installation positions.................................................... 11
3.4 Installation space requirement and installation drawing............... 12
3.5 Water pipe connection....................................................................... 13
3.6 Installation sketch map ...................................................................... 14
3.7 Installation Instruction of Wired Controller...................................... 14
3.8 Wired Controller Installation.............................................................. 17
4 Electric wire connection.................................................................. 20
4.1 Collocation of electric wire................................................................. 20
4.2 Electric wiring, connection................................................................. 22
5 Debugging for the complete unit ................................................... 23
6 Method for adding or discharging refrigerant.............................. 24
6.1 Add refrigerant..................................................................................... 24
6.2 Discharge refrigerant.......................................................................... 24
7 Unit specification............................................................................. 25
7.1 Hot water generation capacity.......................................................... 25
7.2 Operation specification...................................................................... 25
8 Notices for the operation in winter ................................................ 27
9 Maintenance...................................................................................... 28
9.1 Water replenishing and water drainage for water tank ................. 28
9.2 Periodical clean for the water tank................................................... 28
9.3 Replacement of magnesium rod ...................................................... 29
9.4 Maintenance for the unit.................................................................... 30
10 Precautions for Safety Usage....................................................... 30
11 Malfunction analysis...................................................................... 31

Air Source Heat Pump Water Heater
1
1 Safety instructions and recommendations
1.1 Symbols used
indicates the prohibited operations.
indicates instructions that must be followed.
indicates instructions to which special attentions must be paid.
Notice: The special attentions must be paid.
Caution: Risk of material damage.
Warning: Risk of dangerous situation causing slight physical injury.

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1.2 Safety instructions and recommendations
Before you use this product, please read the following instructions carefully.
Caution
For any exceptions such as
burning smells, please cut off the
power supply and then contact
Gree authorized maintenance
center.
If an exception persists, the air
source water heater may be
damaged, which may even cause
an electric shock hazard or cause
a fire.
Do not operate the water heater
with wet hand.
Otherwise, an electric shock
hazard may be caused.
Before installation, check
whether the voltage of the local
power grid accords with the
voltage on nameplate of the
unit, and capacity of the power
supply, power cord or socket is
suitable for input power of this
unit.
Dedicated lines must be used
for the power supply to prevent a
fire.
Do not use multipurpose sockets
or mobile wiring boards to
connect wires. Otherwise,
overheating or even a fire may be
caused.
Pull out the power plug and
drain the main unit and water tank
when water heater is not in use for
a long time to prevent cracking
caused by cold weather.
Do not damage wires or use
undesignated wires.
Otherwise, overheating or a fire
may be caused.
Before cleaning, please cut off
the power supply.
Otherwise, an electric shock
hazard may be caused.
Use dedicated circuits with a
leakage circuit breaker protection
for the power supply and ensure
sufficient capacity.
Otherwise, overheating, a fire, or
an electric shock hazard may be
caused.
Do not change the power
cord or socket without any
consent. Wiring tasks must be
completed by qualified
electricians. Ensure proper
grounding for the metal part of
the unit, and do not change the
grounding mode.

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The unit must be securely
grounded! The grounding wire
must be connected to a
dedicated apparatus of the
building.
If the unit is not grounded,
contact qualified personnel for
installation. Do not connect the
ground cable to the gas pipe,
water pipe, drainage pipe, or any
other places considered improper
by professional personnel.
Do not put any foreign matter
into the unit. Otherwise, the unit
may be damaged or cause
hazards. Do not put your hands
into the air outlet of the main unit.
Otherwise, hazards may be
caused.
Do not repair the unit by
yourself.
Improper repair may cause an
electric shock hazard or a fire.
For repair services, contact the
Gree appointed service center.
Do not stand on the main unit
or water tank, or place any object
on it.
Otherwise, the main unit or water
tank may be deformed or
damaged, or even hazards may
be posed when a person or
object falls off.
To save energy more efficiently,
install the main unit at a
well-ventilated place. Do not block
the air inlet or outlet of the main
unit.
Otherwise, energy efficiency may
be reduced, and shutdown or even
a fire may be caused.
Keep chemical sprays, gas
tanks at least 1 meter away from
the main unit.
Otherwise, fire hazards or
explosions may be caused.
Check whether the base of the
main unit is damaged.
If the base is damaged and not
fixed, the unit may fall off,
causing hazards.
To improve durability of the
water tank, a Magnesium rod is
installed inside the water tank. The
Magnesium rod has a lifespan of
two to three years, and must be
replaced by professional
maintenance personnel if a
replacement is required.
When the water tank has no
water or not full filled, do not
power on the unit. Otherwise,
the unit may be damaged or a
fire may be caused.

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Open the TP valve handle on a
regular (about one month) basis
to check whether it is blocked.
Perform sewage disposal by
following the guide on a regular
(about once a year) basis.
It is normal that the TP valve
drips.
The pressure relief opening
of the TP valve must be
connected to one end of a
securely fixed guide hose, and
the other end is connected to
the floor drain. Ensure that the
guide hose is not twisted or
folded.
You are advised to install the
filter horizontally after the main
shutoff valve of the user's water
pipe. Ensure that the direction
indicated by the arrow on the
filter must be the same as the
water flow. If impurities inside the
waterway need to be cleared,
open the end cap of the filter.
When the filter is installed
vertically, the direction indicated by
the arrow must not be upward and
the end cap must be placed
slantwise downwards.
This marking indicates that
this product should not be
disposed with other household
wastes throughout the EU. To
prevent possible harm to the
environment or human health
from uncontrolled waste
disposal, recycle it possibly to
promote the sustainable reuse
of material resources. To return
you used device, please use the
return and collection systems or
contact the retailer where the
product was purchased. They
can take this product for
environmental safe recycling.
This unit contains fluorinated
gas with greenhouse effect
covered by the Kyoto Protocol.
Maintenance and disposal must
be carried out by qualified
persons only.
Refrigerant gas R134a,
GWP=1430.
The fuse model and rated value
are in accordance with the
corresponding controller or the silk
screen attached on the protective
tube.

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2 Technical description
2.1 general description
High-efficiency and energy-saving
This unit adopts the adaptive control of the electronic expansion valve, whose
opening angle will be adjusted automatically according to the working condition of
the unit. This unit is using the heat in the air to heat the domestic water. It will
operate at the optimized condition all the time under the condition of ensuring
reliability. The water tank adopts external winding microchannel heat exchanger,
which is contacted with the inner port directly for ensuring high heat-exchanging
efficiency and better pressure-bearing capacity. The high-efficiency heat-conducting
materials are adopted between microchannel heat exchanger and inner port of water
tank for better thermal conductivity.
Reliable and durable
Adopt the special compressor for the heat pump water heater, high temperature
and high pressure resistant. The water tank adopts the advanced stainless steel
inner port, equipping with the anticorrosive design for the super-long magnesium.
The complete unit is with multiple kinds of protection.
Eco-friendly and safe
Adopt eco-friendly R134a refrigerant, no pollution to air and no risk of carbon
monoxide poisoning for ensuring safety.
Convenient for installation
The installation is not limited by the environment, which can be installed at
carbarn, storage room, basement, balcony and so on. Not need person to take care
of it. It’s applicable for family and villa and other places, no circulating waterway
system. It’s very convenient for installation and maintenance.
Deluxe configuration
The unit is equipped with high-class touchable wired controller. There’s hotwater,
save, preset, night and electric heating five kinds of heating mode for free selection.
The setting range for the water temperature is 35℃～70℃. You can select fast
heating, timer ON and OFF, preset, i-know, disinfect and other functions.

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Intelligent defrosting
The unit is with freeze prevention and auto defrosting functions, which can solve
the problem of icing and frost.
High water temperature
The highest heating temperature for the heat pump can be up to 70℃, which
can satisfy the requirement for different places and users.
All-weather operation
This unit can provide hot water all the year round.
2.2 Main parts
2.2.1 Appearance
Because of the product improvement, the actual product may be different from
the skect map. Please refer to the actual product.
Fig. 2-1 Sketch map for the appearance

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2.2.2 Main parts
1 Compressor
2 inspiration temperature sensor
3 Refrigerant-affusing nozzle
4 Wiring box
5 controller
6 Faceplant nog
7 Wire hole
8 Water temperature sensor
9 Magnesium rod
10 Water temperature controller
11 electric heating component
12 Water temperature sensor
13 Cold water inlet
14 Drain outlet
15 Microchannel heat exchanger
16 Hot water outlet
17 TP valve meatus
18 Condensate drain outlet
19 Fan
20 Fan groupware
21 evaporator
22 Electronic expansion valve
23 Four-way valve
24 High pressure switch
25 exhaust temperature sensor
Fig. 2-2 Sketch map for main parts

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2.3 Operating principle
Fig. 2-3 Working principle diagram for the air source water heater
The air source water heater is driving the compressor by some part of electricity
by using the heat pump principle. Through the thermal circuit, absorb the heat from
the low-grade energy (air) in the surrounding environment, transmit it to the heat
exchanger of water tank and then release it to the water inside the water tank for
heating water.
The heating principle for air source water heater and heat pump air conditioner
is the same. Heat pump air conditioner supplies the absorbed heat from natural
environment to indoor air, while air source will use that heat to heat domestic water.
Air source water heater is a kind of new, high-efficiency, energy-saving and
eco-friendly water heater.

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2.4 Technical specifications
Model
GRS-2.4/D270ANbA-K
Rated Heating Capacity(1)
W
2400
Rated Input Power(1)
W
685
Capacity
L
270
Load Profile
-
XL
COP(2)
W/W
2.58
Energy Efficiency Class(2)
-
A
Water Heating Energy Efficiency(2)
-
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
Gross/Net Weight
kg
See the nameplate
Sound Power Level(3)
dB(A)
62
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 .

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(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 as per EN 12102-2008, (EU) No 814-2013.
(4) The installation of suction and backflow conduits on the heat pump lessens its
performance.
Under fast water heating mode, electric heater helps to heating water.
Please always see the nameplate for the exact data as this table is subject to
change.
3 Installation
3.1 Important hint
(1) The air source water heater must be installed by professional person
according to national wiring regulation and this instruction manual.
(2) If it needs to install and move the air source water heater, please contact
with Gree appointed local maintenance center. If the air source water heater is
installed by unappointed unit, Gree won’t take the responsibilities for the malfunction
and other problems due to the installation.
(3) If the users use the own prepared installation materials to install the air
source water heater, Gree won't take any responsibilities for all the loss due to
leakage of pipeline, drop of unit and poor installation.
(4) The water quality for the air source water heater should comply with the local
sanitation standard for the domestic drinking water. If using the water in well, ground
water or sea water, it will accelerate the consumption of magnesium rod in water
tank and shorten the service life of the unit.
(5) The water passed through the iron-exchange water softener will accelerate
the consumption of magnesium rod of water tank. Therefore, you are not suggested
connecting the water softener to the water inlet of air source water heater.

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3.2 Basic requirement for the installation position
If the product is installed at below places, it may cause malfunction for the air
source water heater. If it’s unavoidable, please contact local Gree appointed
maintenance center to purchase special models.
(1) There are thermal sources, steam, flammable gas and explosive or volatile
substances.
(2) There are high-frequency equipments, such as welding machines, medical
facilities.
(3) Coastal places.
(4) There’s oil (machine oil) in the air.
(5) There’s sulfureted gas (sulfur spring).
(6) Special places.
3.3 Selection for installation positions
(1) The noise and discharge air won’t disturb neighbours, animals or plants.
(2) Make sure the good ventilation for the water heater; air inlet and air outlet of
water heater can’t be blocked.
(3) The installation position should bear the weight and vibration for the water
heater.
(4) Select the dry place. The unit can’t be exposed at direct sunshine or strong
wind.
(5) Make sure the heat exchanger comply with the requirement of the
installation drawing issue; the unit should be installed at the place where’s
convenient for maintenance and inspection.
(6) Select the place where is beyond the children.
(7) Do not affect the public passage and the city appearance.

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3.4 Installation space requirement and installation
drawing
3.4.1 Main size
Model
GRS-2.4/D270ANbA-K
A (mm)
1958
B (mm)
984
C (mm)
235.5
D (mm)
620
Fig. 3-1 Sketch map for main size
3.4.2 Installation requirement
(1) Do not point the air outlet of water heater at the upwind direction.
(2) The water heater should be installed at the places where the ambient
temperature is above 0℃; The distance between hot water outlet and the hot water
using position can’t be too long. Conduct heat treatment protection for the hot water
pipeline to reduce heat loss.

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(3) The distance between water heater and surrounding wall or other shelter
objects can’t be too small. The installation space should satisfy the drawing
requirement.
(4) If install a rain shed for protecting the water heater, please make sure that it
won’t affect the heat radiation and absorption for the heat exchanger.
(5) The water heater should be installed at the solid place uprightly. Fix the
water heater with ground bolt if necessary.
(6) There should be tap water pipe, joint of hot water pipe and floor drain nearby
the water heater for water supply for water tank, hot water supply and water
drainage.
(7) Condensate water drainage: connect the drainage hose to the drainage hole
on the unit according to the drawing tightly and then lead to drainage hose to proper
place for discharge.
3.5 Water pipe connection
(1) Pipeline preparation
Adopt the special pipe for the hot water exit pipe of water heater. S2.5 series
PPR pipe with the external diameter of dn20 are suggested. If adopt other similar
insulated pipe materials, you can select it by referring to above external diameter
and the pipe thickness. Aluminium pipe are not suggested to be adopted.
(2) Installation of water inlet pipe and water outlet pipe of water tank
The water inlet pipe must be installed with safe device, strainer and cut-off valve,
and the installation sequence must be the same with the sketch map of unit
installation. A cut-off valve must be installed on the water outlet pipe.
For the convenience of drainage or clean for water tank, you are suggested to
install a three-way valve and a cut-off valve at the air outlet of water tank; if the water
tank is far away from the water using point (hot water pipe is more than 20m) or the
hot water using point is lower than the hot water outlet of water tank, three-way valve
and cut-off valve must be installed.
(3) Installation of drainage pipe
Take out the choke plug of drainage outlet, and then connect the drainage outlet
and the floor drain with pipeline. The position for the connection end for drainage

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pipeline and floor drain should be lower than the bottom part of water tank; otherwise,
the water can’t drained completely. A cut-off valve must be installed at the drainage
pipeline, and the cut-off valve must be installed at the position where is convenient
for the operation.
3.6 Installation sketch map
3.7 Installation Instruction of Wired Controller
(1) Fig. A is the standard installation way of wired controller. The wired controller

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is installed on the unit before ex-factory;
(2) Fig. B is the detached installation way of wired controller. Long
communication wire shall be equipped to install the wired controller on the wall. If
this kind of installation way is adopted, please contact the after-sales installation
personnel to select the communication cable with proper length;
Instructions for installing the wired controller on the wall:
①Remove the 6 fixing screws on the top cover;
②Remove the top cover;
③Remove the 6 fixing screws on the front outer case subassembly;
④Remove the front outer case subassembly;
⑤Remove the 3 fixing screws of the gland of wired controller ;
⑥Remove the gland and wired controller (please keep the gland of wired
controller properly for future use);
Please change the original short communication cable with long
communication wire, which is led out from the cable-crossing hole of unit;
⑦Install decoration cover;
⑧Tighten the fixing screw of decoration cover;
⑨Install the front outer case subassembly;
⑩Tighten the 6 fixing screws of front outer case subassembly;
⑪Install the upper cover;
⑫Tighten the fixing screw of upper cover;
⑬Connect the wired controller with long communication cable and then install
the wired controller on the wall;

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Fig. 3-2 Sketch map for Installation Instruction of Wired Controller

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3.8 Wired Controller Installation
3.8.1 Requirements for Wired Controller Installation Locations
(1) Do not install the wired controller in a wet place or a place exposed to direct
sunlight.
(2) Do not install the unit or wired controller of the air source water heater in a
place susceptible to electromagnetic interference.
(3) Ensure that the communication line is connected to the correct interface.
Otherwise, communication will be failure.
3.8.2 Wired Controller Installation
No.
1
2
3
4
Name
Front panel of
wired controller
Screw
Soleplate of
controller
Socket’s base
box installed
in the wall
Fig. 3-3 Accessories of Wired Controller