Gree GRS-CP11Pd/NhA-K User manual

Owner's Manual
Original Instructions
Heat Pump Pool Heater
Models:
GRS-CP11Pd/NhA-K
GRS-CP18Pd/NhA-K

To Users
Thank you for selecting GREE 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:
(1) This appliance is not intended for use by persons (including children) with
reduced physical, sensory or mental capabilities, or lack of experience and
knowledge, unless they have been given supervision or instruction concerning
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.
(2) In order to ensure reliability of product, the product may consume some power
under stand-by status for maintaining normal communication of system and
preheating refrigerant and lubricant. If the product is not to be used for long, cut
off the power supply; please energize and preheat the unit in advance before
reusing it.
(3) Please properly select the model according to actual the using environment,
otherwise it may impact the using convenience.
(4) If the product needs to be installed, moved or maintained, please contact our
designated dealer or local service center for professional support. Users should
not disassemble or maintain the unit by themselves, otherwise it may cause
relative damage, and our company will bear no responsibilities.
(5) 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. If there is adjustment in the product, please
subject to actual product.

Exception Clauses
Manufacturer will bear no responsibilities when personal injury or property loss
is caused by the following reasons:
(1) Damage the product due to improper use or misuse of the product;
(2) Alter, change, maintain or use the product with other equipment without abiding
by the instruction manual of manufacturer;
(3) After verification, the defect of product is directly caused by corrosive gas;
(4) After verification, defects are due to improper operation during transportation of
product;
(5) Operate, repair, maintain the unit without abiding by instruction manual or
related regulations;
(6) After verification, the problem or dispute is caused by the quality specification
or performance of parts and components that produced by other
manufacturers;
(7) The damage is caused by natural calamities, bad using environment or force
majeure.

Contents
1 Safety Notices (Please be Sure to Abide Them)··········· 1
2 Product Introduction ··············································· 5
2.1 Working Principle and Characteristics ....................................5
2.2 Parameters .............................................................................6
2.3 Introduction of Components....................................................7
2.4 Dimensions .............................................................................8
2.5 List of Accessories ..................................................................8
3 Installation ····························································· 9
3.1 Installation Safety Precautions................................................9
3.2 Unit Installation Diagram....................................................... 11
3.3 Dimensional Requirements of Installation Space ................. 11
3.4 Unit Installation Requirements ..............................................12
3.5 Water System Connection ....................................................12
3.6 Electrical Installation .............................................................14
4 Commissioning ·····················································18
4.1 Inspection Before Commissioning ........................................18
4.2 Commissioning .....................................................................18
5 Non-Fault Phenomenon ··········································19
6 Maintenance··························································19
6.1 Daily Maintenance ................................................................19
6.2 Maintenance in Winter ..........................................................20
6.3 Control Board Description & Fault Code...............................21
6.4 Main Control Fault Information..............................................23
6.5 Fault Information Table (Drive Board) ...................................24
6.6 Notices on Maintenance .......................................................25
6.7 After-Sales Services..............................................................31

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1 Safety Notices (Please be Sure to Abide Them)
SPECIAL WARNING:
(1) Be sure to comply with national gas regulations.
(2) Do not pierce or burn.
(3) Do not use means to accelerate the defrosting process or to clean, other than
those recommended by the manufacturer.
(4) Be aware that refrigerants may not contain an odor.
(5) The appliance shall be stored in a room without continuously operating ignition
sources (for example: open flames, an operating gas appliance or an
operating electric heater).
PROHIBITED:
This sign indicates that the items must be prohibited.
Improper operation may cause severe damage or death to people.
WARNING:
If not abide them strictly, it may cause severe damage to the
unit or the people.
NOTE:
If not abide them strictly, it may cause slight or medium damage to
the unit or the people.
OBSERVED:
This sign indicates that the items must be observed.
Improper operation may cause damage to people or property.
WARNING:
This product can’t be installed at corrosive, inflammable or explosive
environment or the place with special requirements, such as kitchen. Otherwise, it
will affect the normal operation or shorten the service life of the unit, or even cause
fire hazard or serious injury. As for the above special places, please adopt special
air conditioner with anti-corrosive or anti-explosion function.
Please read this operating manual carefully before operating the unit.
The air conditioner is charged with inflammable
refrigerant R32 (GWP:
675).
Before using the air conditioner, please read the instruction manual.
Before installing the air conditioner, please read the instruction manual.
Before repairing the air conditioner, please read the instruction manual.
The figures in this manual may be different with the material objects,
please refer to the material objects for reference.

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PROHIBITED!
(1) The unit should be grounded to avoid electric shock. Do not connect the ground wire to gas
pipe, water pipe, lightning arrester or telephone wire.
(2) It is forbidden to change the power cord, socket or grounding mode without authorization.
(3) Please cut off the power supply immediately in case of abnormal conditions (such as burning
smell).
(4) The appliance shall be stored in a well-ventilated area where the room size corresponds to
the room area as specified for operation.
(5) This unit is not suitable for use in places with strong magnetic field, high salinity, high acidity
and extremely unstable voltage.
(6) The appliance shall be stored in a room without continuously operating open flames (for
example an operating gas appliance) and ignition sources (for example an operating electric
heater).
(7) According to federal/state/local laws and regulations, all packages and transportation
materials, including nails, metal or wooden parts, and plastic packing material, must be
treated in a safe way.
(8) The power supply voltage of the unit must not be lower than 180 V. Otherwise, the unit may
fail to operate normally.
WARNING!
(1) Please install according to this instruction manual. Installation must be performed in
accordance with the requirement of NEC and CEC by authorized personnel only.
(2) Any person who is involved with working on or breaking into a refrigerant circuit should hold a
current valid certificate from an industry-
accredited assessment authority, which authorises
their competence to handle refrigerants safely in accordance with an industry reco
gnised
assessment specification.
(3) Servicing shall only be performed as recommended by the equipment manufacturer.
Maintenance and repair requiring the assistance of other skilled personnel shall be carried
out under the supervision of the person competent in the use of flammable refrigerants.
(4) Please cut off the power supply during maintenance.
(5) The appliance shall be installed in accordance with national wiring regulations.
(6) The fixed wires connecting to the appliance must be configured with all-
pole disconnection
device under voltage grade III according to wiring rules.
(7)
The unit should be stored with protective measures against mechanical damage caused by
accident.
(8) It is forbidden to stand or place articles on the unit.
(9)
If the installation space for unit pipe is too small, adopt a protective measure to prevent the
pipe from physical damage.
(10) During installation, use the specialized accessories and components, otherwise
water
leakage, electric shock or fire hazard may occur.

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WARNING!
(11)
Please install the unit in a secure place that can withstand the weight of unit. Insecure
installation may cause the air conditioner falling down and lead to injury.
(12) Be sure to adopt independent po
wer circuit. If the power cord is damaged, it must be repaired
by the manufacturer, service agent or other professional agents.
(13) The unit can be cleaned only after it is turned off and power-
disconnected, otherwise electric
shock may occur.
(14) The unit is not intended to be cleaned or maintained by children without supervision.
(15)
Do not alter the setting of pressure sensor or other protective devices. If the protective
devices are short-
circuited or changed against rules, fire hazard or even explosion may
occur.
(16) Do not operate the unit with wet hands. Do not wash or sprinkle wate
r on the air conditioner,
otherwise malfunction or electric shock will occur.
(17)
Do not dry the filter with naked flame or an air blower; otherwise the filter will be out of shape.
(18) If the unit is to be installed in a small space, please adopt protective me
asures to prevent the
concentration of refrigerant from exceeding the allowable safety limit; Excessive refrigerant
leakage may lead to explosion.
(19) When installing or re-
installing the unit, please keep the refrigerant circuit away from
substances other t
han the specified refrigerant, such as air. Any presence of foreign
substances will cause abnormal pressure change or even explosion, resulting in injury.
(20) Only professionals are allowed to carry on daily maintenance.
(21) Before contacting any wire, make sure power is cut off.
(22) Do not let any inflammable objects near the unit.
(23) Do not use organic solvent to clean the air conditioner.
(24)
If you need to replace a component, please ask a professional to repair with a component
supplied by the original manufacturer so as to ensure the unit’s quality.
(25) Improper operation may get the unit broken, hit by electric shock or cause fire.
(26)
Do not make the unit wet or electric shock may be lead, ensure that the unit will not be
cleaned by water rinsing under any circumstance.
(27)
Once the unit is started, it must be operated for at least 6 minutes before shutdown,
otherwise the service life of the unit will be affected.
Do not manually start and stop the unit
frequently.
(28) When using this product in winter (the temperature may be
lower than 0°C), please ensure
that the unit is always powered on; If it is not used in winter or the unit fails to use due to
failure, please be sure to drain the water in the unit and pipeline immediately after power
failure to prevent the system from freezing and cracking.

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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 responsibly to
promote the sustainable reuse of material
resources. To return 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.
NOTES!
(1) Do not put a finger or other objects into the air inlet or air return grill.
(2) Please adopt safety protection measures before touching the refrigerant pipe, otherwise your
hands may be hurt.
(3) Please arrange the drain pipe according to the instruction manual.
(4) Never stop the unit by directly cutting off the power.
(5) Never install the unit in the following places:
1) Places with oil smoke or volatile liquid: plastic parts may deteriorate and fall o
ff or
even cause water leakage.
2)
Places with corrosive gas: copper pipe or the welding parts may be corroded and
cause refrigerant leakage.
(6) Adopt proper measures to protect the outdoor unit from small animals because they may
damage the electric components and cause malfunction of the air conditioner.
(7) Do not replace accessories on your own. It is recommended to conduct regular inspection
and maintenance every year. Please contact the local after-
sales maintenance personnel,
who will provide you with paid services.
(8) After the warranty period of the product, it is necessary to maintain or replace the power cord,
heat exchanger and other key parts. It is not recommended to use it for a long time.
Otherwise, our company may not be able to assume the relevant
legal liability for all losses
incurred.
(9) This appliance can be used by children aged from 8 years and above and persons with
reduced physical, sensory or mental capabilities or lack of experience and knowledge if they
have been given supervision or
instruction concerning use of the appliance in a safe way and
understand the hazards involved
(10) Children shall not play with the appliance
OBSERVED!
Only use soft dry cloth or slightly wet cloth with neutral detergent to clean the casing of the unit.

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2 Product Introduction
2.1 Working Principle and Characteristics
The pool heat pump heater is a new, efficient, energy-saving and
environmentally friendly product. It uses the principle of heat pump to drive the
compressor with electric energy. Through the thermal cycle, the heat absorbed in
the air is transferred to the water-side heat exchanger for water supply (hot water),
or the heat absorbed by the water-side heat exchanger (cold water) is released into
the air through the thermal cycle.
This series of units adopts environmental protection refrigerant R32, DC
variable frequency compressor, DC fan, electronic expansion valve (EEV),
corrosion-resistant titanium tube heat exchanger, high weather-resistant coating
shell, gold corrosion-resistant radiator-fan, realizing adjustable load during
operation, energy saving and efficiency.
The product has obtained CE certification and meets Rohs requirements. It has
heating, cooling, automatic mode and humanized functions such as fast, intelligent,
energy-saving, timing, WiFi for users to choose from.
Fig. 2.1-1 System schematic diagram

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2.2 Parameters
2.2.1 Heat Pump Technical Data
Model GRS-CP11Pd/NhA-K GRS-CP18Pd/NhA-K
High-Temperature &
High-Humidity Heating:
Ambient Temperature:
27°C/80%, 26°C Water
Inlet
Heating
Capacity kW 2.2~11.8 3.5~18.7
Energy
Efficiency - 13.0-5.8 10.4~5.0
Medium-Temperature &
Medium-Humidity
Heating:
Ambient Temperature:
15°C/70%, 26°C Water
Inlet
Heating
Capacity
kW 2.0-8.8 3.0~15.2
Energy
Efficiency - 6.3-4.5 6.0~4.1
Cooling
Ambient Temperature:
35°C/-, 30°C Water Inlet
Cooling
Capacity
kW 4.5 7.8
Energy
Efficiency
- 3.2 2.9
Maximum Power ①kW 2.5 5.0
Maximum Current ①A 11 22
Water Flow
m3/h
3.8
6.5
Water Resistance (Max)
kPa
5
10
Operating Ambient Temperature
Range
°C Heating: -15-48, Cooling: 15-48
Noise dB(A) 52 56
Dimension(W×D×H) mm 980×376×554 1100×402×660
Weight kg 43 52.5
Hydraulic Connection mm PVC 50/50
Compressor
-
Hermetic Rotary DC Inverter Compressor
Fan Motor
-
DC Fan Motor
Refrigerant
-
R32
Refrigerant Mass kg 0.52 0.70
Electricity Supply
-
Single phase
220-240V ~ 50/60Hz
Protection
-
IPX4
Max. Pool Volume
m
3
40-80
55-120
Mode
-
Heating/Cooling/Automatic
NOTES:
①The above maximum power or maximum current don’t include the power
or current of external engineering water pump.

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2.2.2 Operating Range
Use the swimming pool heat pump unit within the following ranges of
temperature and humidity to ensure safe and efficient operation.
-
Heating Mode
Cooling Mode
Outside temperature
-15°C – +48°C
10°C - 48°C
Water temperature
10°C - 40°C
10°C - 40°C
Relative humidity
≤80%
≤80%
Setting range from the set point
15°C - 40°C
10°C - 40°C
2.3 Introduction of Components
(a)
(b)
Fig. 2.3-1 Unit components

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2.4 Dimensions
Unit: mm
Model GRS-CP11Pd/NhA-K GRS-CP18Pd/NhA-K
A 980 1085
B 554 657
C 945 1060
D 346 371
E 528 570
F 117 160
G 72 82
H 310 340
I 74 87
2.5 List of Accessories
The standard accessories are as follows. In the installation diagram, the
engineering loads or consumables such as valves and pipes shall be purchased
separately according to the actual use needs.
Tab. 2.5-1 Standard accessories
Name
Number
Specification or Diagram
Drainage pipe connection 1
Drainage pipe
1
2(m)
Tapping Screw
1
ST2.9(mm)X6.5(mm)
Magnetic ring
1
M93RS 26X14.9X29
High temperature wire tie
2
200(mm)
Quick connector assembly 2

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3 Installation
3.1 Installation Safety Precautions
Please read the instructions for use, installation and maintenance carefully
before use.
(1) For the product to be installed, moved and repaired, please contact the local
technical service personnel and seek the support of professional institutions.
Otherwise, our company may not be able to assume the relevant legal liability
in case of any damage.
(2) If the user uses self-prepared installation materials for installation, resulting in
pipeline leakage, crash, and bad installation affecting the normal operation
and use of the product, our company may not be able to assume the relevant
legal liability.
(3) The unit adopts environment-friendly, colorless, odorless and flammable R32
refrigerant.
(4) The room area for installation, operation and storage of combustible
refrigerant unit shall be larger than the specified space area.
(5) Do not puncture or ignite the unit.
(6) The relevant gas regulations of the country or region where the installation is
carried out shall be observed.
(7) Avoid installing the unit in a narrow room to prevent the concentration of
refrigerant in the room from exceeding the limit value in case of refrigerant
leakage, resulting in hypoxia or suffocation.
(8) Unless specially recommended by the manufacturer, do not use any method
to accelerate the defrosting process or clean the frosted part.
(9) The unit shall be stored to prevent mechanical damage caused by accidents.
(10) The unit shall be stored in a room without continuous fire source (such as
open fire, ignited gas appliance, and open electric heater).
(11) Before maintenance or repair of heat pump unit using combustible refrigerant,
safety inspection must be carried out to ensure that the risk of fire is
minimized.

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(12) When installation:
1) Be sure to use special accessories and parts;
2) It is forbidden to violate the nitrogen filling welding process;
3) It is forbidden to short circuit or cancel the pressure switch;
4) The unit controlled by the wire controller must be connected to the wire
controller before being powered on.
(13) Before installation, please check the safety of the power supply used and
whether it is consistent with the power supply required on the nameplate. After
the power cord is connected, be sure to install the electrical box cover.
(14) The heat pump unit shall use a special power cord with proper power capacity,
and the wiring sectional area shall not be less than the specification
requirements of the power cord in the Manual.
(15) The unit shall use special circuit and socket, and be equipped with appropriate
leakage protection switch and circuit breaker (air switch). The circuit breaker
shall be full-pole open, with the contact breaking distance of at least 3 mm.
(16) According to the relevant laws, regulations and electrical standards, special
branch leakage devices shall be installed.
(17) The connection method of the unit and the power cord and the interconnection
method of each independent component shall be subject to the circuit diagram
attached to the unit body.
(18) All wiring must use crimping terminals or single-core wires. The direct
connection of multi-stranded wires with the terminal block may cause a spark.
(19) Do not change the internal wiring of the unit at will, otherwise, our company
may not assume relevant legal responsibilities in case of relevant losses.
(20) The model and rating of the fuse shall be subject to the silk screen
identification on the corresponding controller or fuse sleeve.

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3.2 Unit Installation Diagram
Fig. 3.2-1 Unit installation diagram
3.3 Dimensional Requirements of Installation Space
(1) The dimensional requirements of installation space of the unit are shown in the
figure below
.
(2) The installation distance of the unit from the swimming pool shall not exceed 15 m .
Unit: mm
Fig. 3.3-1 Dimensions of unit installation space

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3.4 Unit Installation Requirements
(1) Ensure that the sound and air flow of unit operation will not affect others or
animals and plants.
(2) Ensure that the unit has good ventilation. If a canopy is installed to protect the
unit, the heat dissipation and absorption shall not be affected.
(3) The unit shall be installed at a place with a solid foundation. The unit shall be
installed vertically more than 15 cm above the horizontal ground, and shall be
fully firmly installed with the impact of strong wind, typhoon and earthquake
fully considered.
(4) Clip the unit drain joint into the drain hole in the middle of the base plate to
ensure reliable connection, then connect the drain pipe to the drain joint and
lead the drain pipe to a proper place for drainage.
Fig. 3.4-1 Drainage pipe connection
3.5 Water System Connection
3.5.1 Installation Requirements of Water System Piping
(1) The design and construction of the water system must meet the requirements
of the local plumbing design specifications and relevant standards.
(2) For an appliance intended to be permanently connected to the water mains
and not connected by a hose set.
(3) The water pipe connecting parts must be sealed with raw tape to prevent
water leakage.
(4) The water inlet and outlet connection parts of each pipeline shall be pasted
with water inlet and outlet signs to avoid connection errors.

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(5) The water pipe installation shall be arranged horizontally and vertically, and
the pipe layout shall be reasonable to minimize bending, reducing the
resistance loss of the water system.
(6) All valves must be installed strictly, and the installation sequence must be
consistent with the unit installation diagram.
(7) The pipeline shall be arranged in a centralized way. The water outlet of the
unit shall not be too far from the hot water use point, and there shall be a
drainage floor drain nearby.
(8) There are inevitably some impurities in the water system. A filter must be
installed before the water pump to prevent the blockage of the water-side
heat exchanger of the unit, and shall be cleaned regularly.
(9) All water system pipelines, valves and pipe joints must be laid with insulation
layer to reduce heat loss. Common insulation materials include soft
polyethylene foam (PEF), glass wool, rubber insulation cotton, and the
thickness of insulation layer shall be ≥ 30 mm.
3.5.2 Water Supply Pipeline Connection
The heat pump unit is equipped with two pipe joints (PVC Ø 50 mm), which are
used to connect the pipeline from the filter pump and the water outlet pipeline, and
connect to the circulating hot water system of the swimming pool.
To guarantee the safe usage of tank, a reduction valve should be installed in
the water inlet pipe if the water inlet pressure exceeds 0.5MPa.
Note: The water entering the unit must be the water passing through the
swimming pool filter to prevent the impurities from blocking the heat exchanger of
the heat pump unit, and the swimming pool disinfection device must be installed at
the downstream of the water outlet pipeline of the heat pump unit to prevent the
chemical composition of the disinfection device from affecting the heat exchanger of
the unit.
Fig.3.5-1 Water outlet and water inlet pipe connection

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3.6 Electrical Installation
WARNING!

The product is a Class I electrical appliance that must be installed by professional personnel
according to the wiring specifications of the region or country where it is installed.
The power specification
specified on the nameplate must be used. Before installation, confirm
whether the carrying capacity of the power supply, wire and socket meets the requirements.
The fixed line must be equipped with leakage protection switch and circuit breaker with
sufficient
capacity to ensure full disconnection from the power supply, which shall be directly connected to
the power terminal, and the contact distance on all poles shall be provided with full disconnection
under the condition of Class III overvoltage category.

Be sure to take reliable grounding measures to ensure the grounding is connected to the special
grounding device of the building.

The power supply must use a separate fixed device, with its structure matching the power
demand of the unit and meeting the requirements of the relevant standards of the local country.

Do not use socket converter, cable extension cord, wiring board to adapt to the power cord of the
unit, and do not use other power cords to adapt to the home power supply. The unit shall be
wired separately, and shall not share the same line with other electrical appliances.

In order to avoid danger, the power cord damaged must be replaced by professionals from the
manufacturer, its maintenance department or similar departments. And it is no
t allowed to be
connected under variable methods.
3.6.1 Electrical Wiring
3.6.1.1 Selection of Power Cord Diameter & Circuit Breaker
Tab. 3.7-1 Unit power supply configuration
Model Power Type
Minimum Diameter of
Power Cord(mm²)
Circuit Breaker
Capacity (A)
GRS-CP11Pd/NhA-K
220-240V ~ 50/60Hz
2.5
20
GRS-CP18Pd/NhA-K
220-240V ~ 50/60Hz
4.0
32
3.6.1.2 Wiring Diagram
(1) The external wiring diagram of the unit is as follows, and the wiring diagram
shall be subject to the wiring diagram pasted on the unit body.
(2) Wiring of wire controller
If the display board is installed in any place other than the panel, its wiring
mode shall be in accordance with Position I in the figure.
If the indicator board is installed on the panel, its wiring mode shall be in
accordance with II in the figure.
(Note: Place I and Place II only need to be connected)
(3) RS485 external control
If the user needs to use the RS485 external third party control, its wiring mode
shall be in accordance with the Position III in the figure.

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GRS-CP11Pd/NhA-K
GRS-CP18Pd/NhA-K
①
Water pump power cord: 3×1.0 mm²
②Remote cord: 2×0.75 mm²
③Display board cord: 2×0.75 mm²
Fig.3.6-1 External wiring
3.6.2 Electrical Wiring & Connection Requirements
Fig.3.6-2 External wiring and fixing diagram
(1) After wiring, the power cord, water pump power cord, display board cord,
Remote cord and RS485 cord must be pressed tightly with a fixed clamp,
which shall be pressed on the outer sheath line of the connecting line.
(2) When wiring outside the unit, the display board cord, Remote cord and RS485
cord shall be separated from the power cord and the water pump power cord,
and the minimum distance between their parallel cords shall be greater than
20 cm, otherwise the unit communication may be abnormal. The strong and
weak cords need to be covered with sleeves respectively.
(3) Buckle magnetic ring shall be added in the power cord. Detailed operation
step for the magnetic buckle is as follow:
1) Limit the fixation location of buckle magnetic ring at the outlet of
power cord a cable tie (refer to the mark 4 in the following picture) to
prevent the buckle magnetic ring from sliding along the power cord;
2) Then clasp the buckle magnetic ring to the location of power cord
confirmed with cable tie, after that, re-fix it with a cable tie (refer to the
mark 3 in the following picture).

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Fig.3.6-3 Installation diagram for power cord with buckle magnetic ring
3.6.3 Engineering Load Installation
3.6.3.1 Water Pump Connection
The water supply of the pool machine is realized through the access of the
engineering water pump, which can be installed according to the actual engineering
needs.
(1) When the power cord of the circulating water pump is connected to the pool
heat pump unit and controlled by the receiver, the connection mode shall be
evaluated according to the power of the water pump. If the operating current of
the water pump exceeds 5 A, the connection shall be indirectly controlled
through the intermediate relay; If the operating current of the water pump is
less than 5 A, it can be directly connected to the junction box of the heat pump
unit and controlled by the unit.
(2) When the power supply of the circulating water pump is not connected to the
heat pump unit, it is necessary to ensure that the water pump is started in
advance and reaches the water flow required by the heat pump unit before the
heat pump unit is started, otherwise the heat pump unit will be started.
3.6.3.2 Remote ON/OFF, RS485 Control Connection (Reserved)
The Remote on/off function is used to realize the remote control on/off of the
unit. It can be wired and connected according to the requirements of 3.6.1 above.
The reserved function is not open for the time being.
RS485 control function is applicable to the third party program control unit, and
reserved function is not open for the time being.