Gree GRS-CP11Pd/NhA-D User manual

Heat Pump Pool Heater
Models:
GRS-CP11Pd/NhA-D
GRS-CP18Pd/NhA-D

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·················································7
2.1 Working Principle and Characteristics....................................7
2.2 Parameters ............................................................................8
2.3 Introduction of Components .................................................10
2.4 Dimensions ..........................................................................11
2.5 List of Accessories ...............................................................12
3 Installation····························································· 12
3.1 Installation Safety Precautions .............................................12
3.2 Unit Installation Diagram ......................................................14
3.3 Dimensional Requirements of Installation Space..................14
3.4 Unit Installation Requirements..............................................15
3.5 Water System Connection....................................................16
3.6 Electrical Installation ............................................................18
4 Commissioning ······················································ 21
4.1 Inspection before Commissioning ........................................21
4.2 Commissioning ....................................................................21
5 Non-Fault Phenomenon··········································· 22
6 Maintenance ·························································· 23
6.1 Daily Maintenance ...............................................................23
6.2 Maintenance in Winter .........................................................23
6.3 Control Board Description & Fault Code...............................24
6.4 Main Control Fault Information .............................................26
6.5 Fault Information Table (Drive Board)...................................27
6.6 Notices on Maintenance.......................................................28
6.7 After-Sales Services.............................................................36

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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 odour.
(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).
If not abide them str
ictly, it may cause severe damage to
the unit or the people.
If not abide them strictly, it may cause slight or medium
damage to the unit or the people.
This sign indicates that the items 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.
This product can’t be installed at corrosive, inflammable or explosive
environment or the place with special requirements. 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 unit with
anti-corrosive or anti-explosion function.
Elevated water temperature can be hazardous, The U.S. Consumer Product
Safety Commission has these guidelines:
(1) Spa water temperatures should never exceed 104℉(40℃). A temperature
of100℉(38℃) is considered safe for a healthy adult. Special caution is
suggested for young children.
(2) Drinking of alcoholic beverages before or during spa or hot tub use can cause
drowsiness which could lead to unconsciousness and subsequently result in
drowning.

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(3) Pregnant Women Beware! Soaking in water over 102℉(39℃) can cause fetal
damage during the first three months of pregnancy resulting in the birth of a
brain-damaged or deformed child.
(4) Before entering the spa or hot tub, users should check the water temperature
with an accurate thermometer; spa or hot tub thermostats, may err in
regulating water temperatures by as much as 4℉(2.2℃).
(5) Persons with a medical history of heart disease, circulator problems, diabetes,
or blood pressure problem should obtain a physician’s advice before using
pools or hot tubs.
(6) Persons taking medications which induce drowsiness, such as tranquilizers,
antihistamines, or anticoagulants, should not use spas or hot tubs.
Please read this operating manual carefully before operating the unit.
The unit is charged with inflammable refrigerant R32 (GWP: 675).
Before using the unit, please read the instruction manual.
Before installing the unit, please read the instruction manual.
Before repairing the unit, 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.
(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 be between 180V and 264V. Otherwise, the unit
may fail to operate normally.
(9) Please do not place hands into the outlet of the swimming pool heater, and do not remove the
heater screen at any time.

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(1) Please install according to the instructions. The installation work must be carried out by
professional installation personnel.
(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 authorizes
their competence to handle refrigerants safely in accordance with an industry recognized
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.
(11) Please install the unit in a secure place that can withstand the weight of unit. Insecure
installation may cause the unit falling down and lead to injury.
(12) Be sure to adopt independent power 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 water on the unit, otherwise
malfunction or electric shock will occur.
(17) If the unit is to be installed in a small space, please adopt protective measures to prevent the
concentration of refrigerant from exceeding the allowable safety limit; Excessive refrigerant
leakage may lead to explosion.
(18) When installing or re-installing the unit, please keep the refrigerant circuit away from
substances other than the specified refrigerant, such as air. Any presence of foreign
substances will cause abnormal pressure change or even explosion, resulting in injury.
(19) Only professionals are allowed to carry on daily maintenance.
(20) Before contacting any wire, make sure power is cut off.
(21) Do not let any inflammable objects near the unit.
(22) Do not use organic solvent to clean the unit.
(23) 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.

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(24) Improper operation may get the unit broken, hit by electric shock or cause fire.
(25) 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.
(26)
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.
(27) When using this product in winter (the temperature may be lower than 0
℃
), 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.
(28) Keep ventilation openings clear of obstruction.
(29) The inlet and outlet pipes connected to the unit must be made of insulation, and the length
must be ≥1.5m.
(30) Protection devices ,piping ,and fittings shall be protected as far as possible against adverse
environmental effects ,for example ,the danger of water collecting and freezing in relief pipes
or the accumulation of dirt and debris .
(31) Steel pipes and components shall be protected against corrosion with a rustproof coating
before applying any insulation.
(32) Flexible pipe elements shall be protected against mechanical damage excessive stress by
torsion ,or other forces ,and that they should be checked for mechanical damage annually.
(33) Precautions shall be taken to avoid excessive vibration or pulsation.
(34) This unit is designed for outdoor installation. It is NOT certified for indoor installation. DO NOT
install it in an enclosed area such as a shed or garage, or under a porch or deck.
This marking indicates that this product should not be disposed with other ho
usehold
wastes throughout the U.S
. 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 u
se the
return and collection systems or contact the retailer where the product was purchased.
They can take this product for environmental safe recycling.
(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 off 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 unit.
(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.

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(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. Children shall not play with the appliance. Cleaning and
user maintenance shall not be made by children without supervision.
(10) Only use soft dry cloth or slightly wet cloth with neutral detergent to clean the casing of the
unit.
Water Chemistry
Chemical imbalance can cause severe damage to your heater and associated
equipment. If the mineral content and dissolved solids in the water become too high,
scale forms inside the heat exchanger tubes, reducing heater efficiency and
damaging the heater. If the pH drops below 7.2, this will cause corrosion of the heat
exchanger and severely damage the heater. Heat exchanger damage resulting from
corrosive water will not be covered by the warranty.
For your health and the protection of your pool equipment, it is essential that
your water be chemically balanced. The following levels must be used as a guide for
balanced water.
(1) Occasional chemical shock dosing of the pool water should not damage the
heater providing the water is balanced.
(2) Automatic chemical dosing devices and salt chlorinators are usually more
efficient in heated water. Unless controlled, they can lead to excessively high
chlorine levels which can damage your heater.
(3) Further advice should be obtained from your pool or spa builder, accredited
pool shop, or chemical supplier for the correct levels needed for your pool.
FCC WARNING
WARNING: Changes or modifications to this unit not expressly approved by the
party responsible for compliance could void the user’s authority to operate the
equipment.
FCC STATEMENT
This product contains FCC ID： 2ADAP-GRJWB05J5 and IC： 12478A-GRJWB05J5
CAN ICES-003(B)/NMB-003(B).

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This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions:
(1) This device may not cause harmful interference, and this device must accept
any interference received, including interference that may cause undesired
operation.
(2) NOTE: This equipment has been tested and found to comply with the limits for
a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or
more of the following measures:
1) Reorient or relocate the receiving antenna.
2) Increase the separation between the equipment and receiver.
3) Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected.
4) Consult the dealer or an experienced radio/TV technician for help.

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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-D GRS-CP18Pd/NhA-D
High Air Temperature
- Mid Humidity(63%RH)
Water Temperature:
80.0
℉
Heating
Capacity
Btu/h 38000 60000
Energy
Efficiency
— 5.2 5.0
High Air Temperature
- High Humidity(80%RH)
Water Temperature:
80.0
℉
Heating
Capacity
Btu/h 40500 63000
Energy
Efficiency
—5.5 5.2
Low Air Temperature
- Mid Humidity(63%RH)
Water Temperature:
80.0℉
Heating
Capacity
Btu/h 22000 40000
Energy
Efficiency
— 4.4 3.9
Cooling Air
Temperature: 95℉/-
Water Temperature:
86.0
℉
Cooling
Capacity
Btu/h 16500 26000
Energy
Efficiency
— 3.9 3.9
Maximum Power ①kW 2.5 3.55
Maximum Current ①A 13 16.5
Water Flow gpm 13.6-20.4 22.8-34.3
Water Resistance psi 0.725 1.74
Noise②dB(A) 52 56
Dimension(W×D×H)
in.
(mm)
39.3×14.8×21.8
(998×376×554)
42.7×15.8×25.9
(1085×402×657)
Weight lbs 97.0 120
Hydraulic Connection
in.
(mm)
1-1/2*PVC (50mm)
Compressor — Hermetic Rotary DC Inverter Compressor
Fan Motor — DC Fan Motor
Refrigerant③— R32
Refrigerant Mass oz 18.3 25.8
Electricity Supply —
Single phase
208/230V ~ 60Hz
Protection — IPX4
Mode — Heating/Cooling/Automatic

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①
The above maximum power or maximum current don’t include the power
or current of external engineering water pump.
②
The noise data is the average sound pressure value measured under
high temperature and mid humidity heating conditions (Dry air 80.6℉
-Relative humidity 63% - Water inlet temperature 80℉) with a distance
of 1m away from the unit.
③
This parametric is the maximum refrigerant charge amount of the unit.
④
The recommended maximum pool volume is based on the ideal
heating condition that the pool is well shaded; the filtration system runs
for 15h per day, water temperature is maintained at 80℉,and ambient
temperature ≥82.4℉.
2.2.2 Operating Range
Use the swimming pool heat pump unit within the following ranges of
temperature and water pressure to ensure safe and efficient operation.
— Heating Mode Cooling Mode
Outside temperature 5℉~ 113℉
（-15℃~ 45℃）
60.8℉~ 113℉
（16℃~ 45℃）
Water temperature
50
℉
~ 100.4
℉
（10℃~ 38℃）
50
℉
~ 104
℉
（10℃~ 40℃）
Setting range from the set point
59
℉
~ 104
℉
（15℃~ 40℃）
50
℉
~ 104
℉
（10℃~ 40℃）
Water pressure 0.1 ~ 0.5MPa 0.1 ~ 0.5MPa

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2.3 Introduction of Components
(a)
(b)
Fig. 2.3-1 Unit components

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2.4 Dimensions
Fig. 2.4-1 Dimensions
Unit: in.(mm)
Model GRS-CP11Pd/NhA-D GRS-CP18Pd/NhA-D
A 39.3(998) 43.8(1112)
B 21.8(554) 25.9(657)
C 37.2(945) 41.7(1060)
D 13.6(346) 14.6(371)
E
20.8(528)
22.4(570)
F 4.6(117) 6.3(160)
G 2.8(72) 3.2(82)
H 12.2(310) 13.4(340)
I 4.9(125) 5.5(140)

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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
Tapping Screw 1
Quick connector assembly 2
Chassis rubber plug(for GRS-CP11Pd/NhA-D) 2
Chassis rubber plug(for GRS-CP18Pd/NhA-D) 4
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.

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(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.
(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

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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.
(21) Communication cables should be laid out through cabling through, conduit
tube or cable channel.
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.
(3) The heat pump must be installed at a minimum distance from the pool in
compliance with NFC15-100 (3.5 m from the water for France) or in
compliance with installation standards applicable in other countries.

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Unit: in.(mm)
Fig. 3.3-1 Dimensions of unit installation space
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) The wooden base with the unit should be removed when conducting
installation.
(5) We recommend sheltering the unit to avoid the possibility that snow
accumulates and damages the evaporator.
(6) Drainage ditch should be reserved next to the unit for condensate discharging
as well as evacuating water for disuse in winter.
(7) If the unit is installed in a place that does not require drainage, it is
recommended that all drainage holes be unblocked. Special attention should
be paid to: at this time, the water discharge from the drainage holes are easy
to freeze in the temperature below 0℃, please set up warning signs or
isolation fences at the unit install site to avoid unnecessary injures such as
sliding.

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(8) If the unit is installed in the designated place with drainage requirements,
choose the drain pipe mounting hole as shown in the following figure to clamp
into the drainage joint to guide the drainage, other drainage holes are sealed
with drain caps.
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.
(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