Gree GRS-CQ4.0Pd/NhG-K User manual

Change for life
Owner's Manual
Original Instructions
Air Conditioners
Air-to-water Heat Pump
Thank you for choosing commercial air conditioners. Please read
this Owner’ s Manual carefully before operation and retain it for
future reference.
If you have lost the Owner's Manual,please contact the local agent
or visit www.gree.com or send an email to [email protected] for
the electronic version.
GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI
SPLI T TYPE

To Users
Thank you for selecting Gree’s product. Please read this instruction manual carefully before installing and using
the product, so as to master and correctly use the product. In order to guide you to correctly install and use our
product and achieve expected operating effect, we hereby instruct as below:
This equipment should be installed, operated or maintained by the qualified servicemen who have had specific
training. During operation, all safety issues covered in the labels, User’s Manual and other literature should be
followed strictly. This equipment is not intended for use by persons (including children) with reduced physical,
sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision
or instruction concerning use of the appliance by a person responsibility for their safety. Children should be
supervised to ensure that they do not play with the appliance.
This product has gone through strict inspection and operational test before leaving the factory. In order to avoid
damage due to improper disassembly and inspection, which may impact the normal operation of unit, please
do not disassemble the unit by yourself. You can contact with the special maintenance center of our company if
necessary.
For personal injury or property loss and damage caused by improper operation such as improper installation
and debugging, unnecessary maintenance, violation of related national laws and rules and industrial standard, and
violation of this instruction manual, etc., we will bear no liability.
When the product is faulted and cannot be operated, please contact with our maintenance center as soon as
possible by providing the following information.
Contents of nameplate of product (model, cooling/heating capacity, product No., ex-factory date).
Malfunction status (specify the situations before and after the error occurs).
All the illustrations and information in the instruction manual are only for reference. In order to make the product
better, we will continuously conduct improvement and innovation. We have the right to make necessary revision to
the product from time to time due to the reason of sales or production, and reserve the right to revise the contents
without further notice.
The final right to interpret for this instruction manual belongs to Gree Electric Appliances Inc. of Zhuhai.

Contents
Safety Notices (Please be sure to abide ) ................................................................... 1
1. Diagram of the Operating Principle .........................................................................7
2. Operating Principle of the Unit ................................................................................8
3. Nomenclature .......................................................................................................... 10
4. Installation Example ...............................................................................................11
5. Main Components ...................................................................................................13
6 Installation Guideline of Outdoor Unit...............................................................................15
6.1 Instruction to installation................................................................................................15
6.2 Installation of outdoor unit .............................................................................................15
7 Installation of Indoor Unit........................................................................................17
7.1 Select installation location of indoor unit........................................................................17
7.2 Available External Static Pressure of Outlet........................................................................... 17
7.3 Water volume and expansion vessel pressure ..............................................................18
7.4 The method of calculating the charging pressure of expansion vessel ..........................18
7.5 Selection of expansion vessel .......................................................................................19
8. Remote Air Temperature Sensor............................................................................ 20
9. Thermostat...............................................................................................................21
10. 2-Way Valve ...........................................................................................................21
11. 3-Way Valve ........................................................................................................... 22
12. Other Auxiliary Heat Sources............................................................................... 22
13. Gate-controller ...................................................................................................... 23
14. Charging and Discharging of Refrigerant ...........................................................23
15. Installation of Insulated Water Tank ....................................................................24
15.1 Installation measure....................................................................................................24
15.2 Outline dimension and parameter of water tank ..........................................................25
15.3 Connection of waterway system..................................................................................26
15.4 Electric wiring work .................................................................................................................. 27
16. Wring Diagram.......................................................................................................29
16.1 Control Board..............................................................................................................29
17.2 Electric Wiring........................................................................................................................... 41
18. Commissioning ..................................................................................................... 44
18.1 Check before startup...................................................................................................44
18.2 Test run.......................................................................................................................45
19. Daily Operation and Maintenance........................................................................ 46
20. Refrigerant Collecting ............................................................................................47

1
After receipt of the unit, check it for appearance, unit model compared with your
desire
and attachments.
Design and installation work of the unit must be performed by authorized personnel
according to applicable laws and regulations and this Instruction.
After installation work, the unit cannot be energized unless there is not any problem
in
check.
Ensure periodical clean and maintenance of the unit after normal operation of the unit
for longer life and reliable operation.
If the supply cord is damaged, it must be replaced by the manufacturer, its service
agent or similarly qualified persons in order to avoid a hazard.
The appliance shall be installed in accordance with national wiring regulations.
This product is a kind of comfort air conditioning, and is not allowed to be installed
where there are corrosive, explosive and inflammable substances or smog; otherwise
it would lead to operation failure, shortened service life, five hazard or even severe
injuries. Special air conditions are required for where mentioned above.
NOTE
SPLI T TYPE Air-to-water Heat Pump
Safety Notices (Please be sure to abide )
WARNING: If not abide strictly, it may cause severe damage to the unit or the
people.
NOTE: If not abide strictly, it may cause slight or medium damage to the unit or the
people.
This sign indicates that the operation must be prohibited. Improper operation may
cause severe damage or death to people
This sign indicates that the items must be observed. Improper operation may
cause damage to people or property.
Correct Disposure
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 dispos
al,recycle it responsibly to promote the
sustainable reuse of material resources. To retuern your 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.
R410A(R32/125:50/50):2087.5

2
Air-to-water Heat Pump SPLIT TYPE
WARNING
Once abnormality
likeburning smell occurs,
please cut off the power
supply immediately and
then contact with service
center.
If the abnormality still exists,
the unit may be damaged
and electric shock or fire
may result.
Don't operate the unit with
wet hand.
Otherwise, it may cause
electric shock.
Before
installation,please see
if the voltage of local
place accords with
that on nameplate
of unit and capacity
of power supply,
power cord or socket
is suitable for input
power of this unit.
Special circuit must be
adopted for power supply
to prevent fire.
Do not use octopus
multipurpose plug or mobile
terminal board for wire
connection.
Be sure to pull out the
power plug and drain the
indoor unit and water tank
when unit is not in use for a
long time.
Otherwise, the accumulated
dust may cause
overheating,fire or freeze of
water tank or coaxial heater
exchanger in winter.
Never damage the
electric wire or use
the one which is not
specified.
Otherwise, it may
cause overheating or
fire.

3
SPLI T TYPE Air-to-water Heat Pump
Before cleaning please cut
off the power supply.
Otherwise, it may cause
electric shock or damage.
The power supply must
adopt special circuit with
leakage switch and enough
capacity.
User can not change
power cord socket
without prior consent.
Wiring working
must be done by
professionals. Ensure
good earthing and
don't change earthing
mode of unit.
Earthing: the unit must
be earthed reliably ! The
earthing wire should
connect with special device
of buildings.
If not, please ask the
qualified personnel to
install.
Furthermore, don't connect
earth wire to gas pipe,
water pipe, drainage pipe or
any other improper places
which professional does not
recognize.
Never insert any foreign
matter into outdoor unit to
avoid damage . And never
insert your hands into the
air outlet of outdoor unit.
Don't attempt to repair
the unit by yourself.
Improper repair may
cause electric shock
or fire, so you should
contact the service
center to repair.

4
Air-to-water Heat Pump SPLIT TYPE
Don't step on the top of the
unit or place anything on it.
There is the danger of fall of
things or people.
Never block the air inlet and
outlet of unit.
It may reduce efficiency or
cause stop of the unit and
even fire.
Keep pressurized
spray, gas holder and
so on away from the
unit above 1m .
It may cause fire or
explosion.
Please note whether the
installation stand is firm
enough or not.
If damaged, it may cause
fall of the unit and injury of
people.
Unit should be installed
at the place with good
ventilation to save energy.
When there is not
water in water tank,
never power the unit
on to run.

5
SPLI T TYPE Air-to-water Heat Pump
NOTE
Before installation, please check if the adopted power is accordance with that listed
on nameplate, and check the safety of power.
The unit shall contact with the supply mains by a full disconnection device under
overvoltage category Ⅲ
.
Before using, please check and confirm if wires and water pipes are connected
correctly to avoid water leakage, electric shock or fire etc.
Don’t operate the unit with wet hand, and don’t allow children to operate the unit.
The On/off in the instruction is for the operation to on and off button of PCB for users;
cut off power means to stop supplying power to the unit.
Don’t directly expose the unit under the corrosive ambient with water or dampness.
Don’t operate the unit without water in water tank .The air outlet/inlet of unit cannot be
blocked by other objects.
The water in unit and pipeline should be discharged if the unit is not in use, to prevent
the water tank, pipe line and water pump from frost-cracking.
Never press the button with sharp objects to protect manual controller. Never use
other wires instead of special communication line of the unit to protect control elements.
Never clean the manual controller with benzene, thinner or chemical cloth to avoid
fading of surface and failure of elements. Clean the unit with the cloth soaked in neutral
eradicator. Slightly clean the display screen and connecting parts to avoid fading.
The power cord must be separated with the communication line.

6
Air-to-water Heat Pump SPLIT TYPE
maximum and minimum water operating temperatures.
Item Minimum water operating
temperatures
Maximum
water operating
temperatures
Cooling
7°C
25°C
Heating
25°C
60°C
Water heating
40°C
80°C
maximum and minimum water operating pressures.
Item
Minimum water operating
pressures
Maximum water
operating pressures
Cooling
0.05MPa 0.25MPa
Heating
Water heating
maximum and minimum entering water pressures.
Item
Minimum entering water
pressures
Maximum entering
water pressures
Cooling
0.05MPa 0.25MPa
Heating
Water heating
The range of external static pressures at which the appliance was tested (add-on
heat pumps, and appliances with supplementary heaters, only); If the supply cord
is damaged, it must be replaced by the manufacturer, its service agent or similarly
qualified persons in order to avoid a hazard.
The appliance is intended to be permanently connected to the water mains and not
connected by a hose-set.
If there is any question, please contact with local dealer, authorized service center,
agencies or our company directly.