Airwell VVWO Series User manual

IMPORTANT NOTE:
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22.AW.VVWO.220-335.R410A.IM.EN.03.30.Rev01
 
Installation Manual
ODU VRF (VVWO Series)
R410A
English Manual
VVWO-220R-01T32
VVWO-280R-01T32
VVWO-335R-01T32

User Manual
This VRF series adopts “mode consistence”
control method, which means all the indoor
units can only operate cooling or heating at
one time.
To protect compressor, before startup, the
unit should be powered on over 12 hours
or oil superheat should be over 20°C. If the
unit is not used for a long time, please cut
off the power to save energy, or the unit will
consume the power. When the environment
temperature may be lower than 0°C, drain
off water in the system, prevent frost crack
system.
The waterproof rating of the machine is IPX0,
pay attention to the protection
The minimum heating water temperature
for this unit is 7 degrees Celsius, if lower
temperature heating is required, please
choose other low-temperature products
If some failures often occurs in the unit, such
as low pressure failure, low outlet water
temperature failure, low pressure difference
failure or low discharge temperature failure,
it may be due to the very low inlet water
temperature, or the very low water ow
rate, or the very low indoor temperature. If
it is conrmed that the cause of the failure
is among the above factors, the inlet water
temperature or the inlet water ow rate must
be increased.
Operation condition:
Operating Range of Air Conditioner
Condition Cooling Heating
The outdoor
environment
temperature
0-40°C
The outdoor
environment
humidity
<80%
Indoor temperature 17-32°C 15-30°C
Water inlet
temperature 7-45°C
Rated water ow
8HP: 4.8m3/h;
10HP: 6.0m3/h;
12HP:7.2m3/h
Contents
Safety ...........................................................1
Installation instruction...................................4
Product introduction......................................7
Exterior and installation dimensions...........17
Installation procedure .................................22
Electric wiring and the application ..............35
Failure code................................................53
Commissioning and the performance.........62
Move and scrap the air conditioning...........64
Warning
• If the supply cord is damaged, it must be
replaced by the manufacturer, its service
agent or similarly qualied persons in order
to avoid a hazard.
• 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 responsible for their safety.
• Children should be supervised to ensure
that they do not play with the appliance.
• 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.
• The appliances are not intended to be
operated by means of an external timer or
separate remote-control system.
• Keep the appliance and its cord out of reach
of children less than 8 years.

1
Safety
• This manual should always be accessible and close to this air condition equipment.
• There are two types of indications, " WARNING" and " CAUTION". The indication
preventing from death or heavy injury is listed as " WARNING". Even the indication listed as
" CAUTION" may also cause serious accident. Both of them are related to safety, and should
be strictly followed.
• After installation and start-up commissioning, please handover the manual to the user. The
manual should be well kept in safety place and close to the unit.
• The installation or the maintenance should be performed by an authorized agency. The wrong
operation of this air condition equipment may cause water leakage, electric shock, re, etc.
• Please install the unit on the top of a solid foundation or structure which is strong enough to
support the unit.
• The installation of this air condition equipment should follow local construction codes.
• Use the right cable size, secure the terminal rmly, organize the cables well and make sure no
tension is added on cables. Cable insulation should not be damaged. The incorrect installation
may lead to overheat or re.
• The circuit should be installed leakage protector,or it will cause electric shock.
• The ow switch in the accessory should be installed on the outlet water pipe.
• In winter, if you do not use for short periods of time, please ensure the machine 24 hours
power on, if you do not use for a long time, drain off the water in the system, prevent frost
crack system.
• When installing or moving the unit, the refrigerant system should be vacuumed and recharged
with R-410A refrigerant. If any other gas enters the system, it may lead to abnormal high
pressure which may cause damage or injury.
• Please use the proper manifolds or accessories during the system installation. The wrong
parts may cause refrigerant leakage.
• Keep the drain pipe away from toxic gas vents to prevent possible pollution of indoor
environment.
• During or after the installation, please check whether there is refrigerant leakage. If any
leakage, please take any measures for ventilation. The refrigerant may be toxic at some
concentration levels.
• The unit should be connected with closed water system.
• The unit is not explosion-proof. Please keep it away from ammable gases.
• The water pipe should be installed in accordance with this manual to ensure proper drainage.
The pipe should be well insulated to avoid condensation. Wrong installation may lead to water
leakage.
• Both liquid pipe and the gas pipe should also be well insulated. Defective insulation may
lead to system performance deterioration or humidity formation.
• Please keep children away from this air condition equipment.

2
Safety
• Grounding wire should be connected with the grounding bar. The grounding wire cannot
be connected to the gas pipe, water pipe, lightening rod or the telephone grounding wire.
Improper grounding may cause electric shock.
• Use the wrench to fasten the nut and are at proper torque. Excessive torque may cause
ared section to break, leading to refrigerant leakage.
• After refrigerant pipe installation, please take nitrogen leakage test to avoid refrigerant
leakage.
• R-410A is the only permitted refrigerant.
• To avoid charging wrong refrigerant, the diameter of check valve is changed for R-410A.
To strengthen the pipe, the dimension of ared pipe is also changed. Please use R-410A
specied tools as shown below.
R-410A specied tools Remarks
1Gauge manifold Range: HP ＞4.5MPa, LP ＞2MPa
2Charge hose Pressure: HP: 5.3MPa, LP: 3.5MPa
3Electronic weight meter for charging R-410A No other means are permitted
4Torque wrench
5Flaring tool
6 Copper pipe gauge for adjusting projecting margin
7 Vacuum pump tting Vacuum pump must be equipped with
check valve
8Leakage detector Only helium detector is permitted

3
• When charging refrigerant, the refrigerant must be in liquid state from the tank.
• To prevent EMC from interfering other appliances, please keep indoor unit, outdoor unit,
power cable and connecting wire at least 1m away from those appliances .
• Fluorescent lamp (reverse phase or rapid start type) may interfere the remote controller's
signal. Please install indoor unit away from uorescent lamp. The farther, the better.
• The temperature and ow of the outdoor unit inlet water need to conform to the requirements
of the specication, the water temperature is too low or the water ow is too small will cause
the unit malfunction.
• The quality of the circulating water must conform to the specications. otherwise it will
decrease the system life.
• The pipe for external devices water system should use corrosion resistant materials, otherwise
may cause corrosion.
• Water system Max. pressure is 1.6MPa, if the water pressure for the target ow switch is
greater than 1.6MPa, may affect the target ow work.
• Water ows too small protection, after the compressor operation, if the temp. difference
between Twi and Two is too large, the unit will standby and alarm, 100 seconds later resume
automatically, if it occurs three times in an hour, conrm the failure.
• If the inlet water temperature is below 10°C or the outlet water temperature is below 4°C, in
order to avoid the heat exchanger cracking due to the freezing water, the following measures
must be implemented:
The least inlet water ow rate must be over 70% of the rated value.
Add antifreeze such as ethylene glycol into the water system, and use corrosion inhibitors to
ensure the PH value of the water is about 7.5, or it will cause the heat exchanger corrosion
cracking.
Inform the technical personnel to carry out the necessary inspection and setting for the unit.
• If the outdoor unitislower than the indoor units and the high drop is less than 25 meters,
inletwater temperature can reach 7°C when cooling.
When heating , if inlet water is groundwater type, when the master unit has the maximum
water ow rate (1.5 times the rated value),the lowest inlet water temperature can be down to
5°C .
When heating , if the cooling capacity of the smallest indoor unit in the system is not less than
3.6kW, and the inlet water ow rate is not exceed the rated value, the maximum inlet water
temperature can be up to 50°C.
Safety

4
Installation & Startup Quick Guides
1. Installation Procedure
1.1 Drafting of diagram, select the installing place including the wiring and piping
1.2 Pre-installation, including pipe protective sleeves, hooks, supports, etc.
1.3 Indoor installation
1.3.1 Indoor DIP switch settings
1.3.2 Indoor unit installation
1.3.3 Refrigerant piping installation
1.3.4 Drain piping installation
1.3.5 Duct work when install the duct indoor unit
1.3.6 Heat insulation work, including refrigerant pipe and drain pipe
1.3.7 Electric wiring work
1.4 Outdoor installation
1.4.1 Outdoor unit foundation work
1.4.2 Outdoor unit installation
1.4.3 Refrigerant piping connection
1.4.4 Leakage test
1.4.5 Vacuum drying
1.4.6 Additional refrigerant charging
1.4.7 Outdoor maintenance panel installation
1.5 Water system installation
1.5.1 Piping connection
1.5.2 Water leak detection
1.5.3 System ushing
2. Startup Procedure
2.1 Check the power cables connection of each indoor unit
2.2 Check the communication wires connection of each indoor unit
2.3 Check the wired controller wires connection of each indoor unit
2.4 Set Protocol translator DIP switches if connected with central controller or BMS system
2.5 Check the central controller or BMS setting if the central controller or BMS device is used
2.6 Check the power cables connection of each outdoor unit
2.7 Check the P,Q connection and the communication among outdoors A,B,C connection
2.8 Check the indoor control type
2.9 Check the indoor communication address when in central control
2.10 Check the indoor central control address when in central control
2.11 Check the indoor group control address when in group control
2.12 Check the outdoor pipe length switch on outdoor PCB
2.13 Check the outdoor capacity over match switch setting on outdoor PCB
2.14 Check the outdoor unit address: the master unit must be No. 1
2.15 Check the outdoor units searching when multi units in combination
2.16 Check the outdoor capacity
2.17 Start commissioning according to the rotary switch function
2.18 Check if the pump and valve is open
Warning:
Please set DIP switches of indoor units before installing indoor units into their nal position
Installation instruction

5
For installation, please review the items below:
• Are the connected units quantity and the total capacity in the allowable range?
• Is the refrigerant pipe length in the limited range?
• Is the pipe size proper? And if the pipe is installed horizontally?
• Is the branch pipe installed horizontally or vertically?
• Is the additional refrigerant counted correctly and weighed by the standard balance?
• Is there refrigerant leakage?
• Can all the indoor power supplies be on/off simultaneously?
• Is the power voltage in compliance with the data marked on the rating label?
• Have the address of indoors and outdoors been set?
• If the control line of the target ow switch connect well?
• If the control line of the pump connect well?
• If the inlet and outlet water pipe install correctly?
• If the water temperature is within the scope of the restrictions?
• If the water ow is within the scope of the restrictions?
Installation instruction
(1) Accessories No. Name Quantity
1Flow switch 1
2Installation manual 1
3T shape pipe, only use for multiple modules 1
4Pipe adaptor 1 (10HP: 2)
(2) Before installation
1) Before installation, check respectively if the model, power supply, pipes, wires and
accessories purchased are correct.
2) Check if the indoors and outdoors can be combined as the following.
Outdoor Indoor
Gather pipe
Capacity
(100W) Combination type Indoor Qty Total indoor capacity (100W)
224 Single (8HP) 13 112-291
280 Single (10HP) 16 140-364
335 Single (12HP) 19 168-436
448 Combination (8HP+8HP) 23 224-582 TAS20
504 Combination (8HP+10HP) 29 252-655 TAS20
560 Combination (10HP+10HP) 33 280-728 TAS20
615 Combination (10HP+12HP) 36 307-800 TAS20
670 Combination (12HP+12HP) 39 335-871 TAS20
728 Combination (8HP+8HP+10HP) 43 364-946 TAS30
784 Combination (8HP+10HP+10HP) 46 392-1019 TAS30
840 Combination (10HP+10HP+10HP) 50 420-1092 TAS30
895 Combination (10HP+10HP+12HP) 53 448-1164 TAS30
950 Combination (10HP+12HP+12HP) 56 475-1235 TAS30
1005 Combination (12HP+12HP+12HP) 59 503-1307 TAS30
Name Model Function For what units
Outdoor branch pipe TAS20 Refrigerant gathering 2 Modules
TAS30 3 Modules

6
(3) Installation place selection
Installation instruction
Air-conditioner can't be
installed in the place with
ammable gas. Or it will
cause re hazard.
The outdoor unit should not
be installed at the place
where much water can drop
in.
The unit should be installed at
the strong enough place. Or it will
cause vibration and noise.
• It is better not install the unit
at the below places, or it will
cause damage.
• The place where there is
corrosive gas (spring area, etc).
• The place blowing salty air
(seaside, etc).
• The place existing strong coal
smoke.
• The place with high humidity.
• The place where there is device
emitting Hertzian waves.
• The place where voltage
changes greatly.
• During installation, install
the anti-vibration rubber
between the unit and the
bracket.
The outdoor unit should
not be installed next to
living rooms.
Note:
1. Do not install the unit at the place where the ammable gas will leak.
2. Install the unit at the strong enough place.
3. Install the unit at the at place.
4. After opening the electric box cover for maintenance, please x the cover with screw rmly.
(4) Transportation
• During transportation, please don't unwrap the packaging, and move the
unit to the installation location as closely as possible.
• Don't hang the unit only at two points. When hanging the unit, don't sit on
the unit. The unit should be upright.
• When removing the unit with the forklift, put the fork into the special
hole at the bottom of the unit. When being hanged, the rope should be 4
pieces of steel cable with over 6mm diameter.
• Put the cushion at the contact section between steel cable and the unit
against the distortion or damage.
• Forbid lifting the unit by lifting the wood bottom seat.
Note:
When multiple modules are installed, the outdoor unit should be ranked by capacity, the larger
capacity is closer to the main pipe of gather pipe.
Steel cable
Cushion

7
Product introduction
• Water Cooled VRF is a water-air heat pump air condition equipment which can deliver cooling
and heating by taking water as its heat source. Water acts as the heat-extraction source when
heating, while heat-absorption source when cooling. Thus there is no risk of frost formation on
condenser’s surface.
• Water Cooled VRF takes a water circulating loop as its heat and heat-extraction source. When
the water’s temperature in the loop is higher than the rated value because of the heat release
of the Water Cooled VRF (Cooling), the water will exchange the heat into the air through the
cooling tower. When the temperature is lower than the rated value, water heating is usually
utilized by the heating equipment or the waste heat.
• In a case of there are more than one Water Cooled VRF being installed, the whole system can
have some units running in cooling and other units running in heating, to realize the energy
saving of water side heat recovery.
Advantages
Attentions
Main Components
Energy-saving
The Water Cooled VRF delivers higher efciency compared with the air-air heat pump series
because of its low condensing temperature. Individual measure of electricity consumption
on this VRF equipment is available. For example, when the building is occupied by different
tenants, the electricity charge and maintenance cost can be counted separately. Cooling and
heating simultaneously in combination system can achieve inner balance of the energy, save the
operating time of the cooling tower and heating equipment, and achieve the purpose of energy
saving.
Flexible Application
As the efciency of the water system will not be affected by ambient temperature, users can
choose cooling or heating mode exibly in different seasons or based on practical requirements.
This Water Cooled VRF uses "Mode Consistence" control method without refrigeration side heat
recovery function, which means all the indoor units under same outdoor system can only run
either cooling or heating at one time.
The Water Cooled VRF is composed of two parts, parallel connected Water Cooled sets and
dual circulating pipes.
The main equipment and accessories include the following: cooling equipment; heating
equipment (heat exchanger unit or boiler); water treatment equipment; expansion tank; water
circulating pump; water ow switch.
Product introduction

8
Product introduction
a. Cooling circulation
b. Heating circulation
Operation chart
Closed-type
cooling tower
Expansion tank
Circulating
pump
Circulating
pump
Circulating
pump
Water inlet 30°CWater inlet 30°CWater inlet 30°C
Water
outlet
35°C
The outdoor units
Expansion tank
Boiler
Circulating
pump
Circulating
pump
Circulating
pump
Water inlet 20°CWater inlet 20°CWater inlet 20°C
The outdoor units
Water
outlet
15°C

9
Product introduction
Water system
Cooling water system guarantees Water Cooled VRF reliable operation. Water volume and
water temperature should reach the design index (see the technical parameter) during the
designing of VRF water system in order to not cause cooling volume dropping or tripping
protection because of inadequate water or lack water or water temperature too high.
① System water volume and water temperature .
The total water ow volume is the sum of each Water Cooled VRF ow volume referring to
technical specs. for each individual unit rated water ow volume. Temperature of water inlet is
7-45°C. When system uses electrical two way valve to control water ow volume, the total water
ow volume can be counted by the units working ratio.
a) The ow switch is placed below the electrical box, please out during installation .
b) Note the direction of the ow switch, can’t install vertical downward.
c) The straight pipe length L1 and L2 should be not less than 160 mm, or it will affect the control
precision.
d) When connect wiring, please cut off power supply.
e) Prohibit change ow switch settings.
f) Please connect to the earth, after connect wiring, don’t forget install the ow switch shell.
g) Flow switch should be installed by connecting the terminal 1, 3 with K1, K2 of outdoor unit.
Water pipe of DN32
Water ow switch
Gate valve
External
Water from outdoor unit
L1 L2

10
Product introduction
③ Water treatment and control
When the Circulating cooling water runs for a long time, it will produce algae, and salinity will
rise, resulting in heat exchanger fouling, which will affect the heat transfer efciency. It is better
to process timely. Electronic water treatment meters should be included for scale resistance
protection and water quality stablization. They have been widely applied in engineering now.
Therefore the electronic water treatment meter is preferred in the cooling water system design.
You will experience accumulation of sludge in the Water Cooled VRF water system after
operation (caused by dust in the air), which needs regular cleaning (generally one time a year).
Professional central AC water system cleaning agent is recommended.
Water quality control
Item Standard requirements Inuencing factors
Standard
PH 7.5-9.0 ○/□
Conductivity ≤200uv/cm(25°C) ○/□
Chlorine ion ≤50ppm □
Sulfate ion ≤50ppm □
Total iron ≤0.3ppm □
Alkali ion ≤50ppm □
Total hardness ≤50ppm ○
Reference
Sulon /□
Ammonium ion /□
Silicon ≤30ppm ○
Notes: ○: scaling □: erosion
Closed-type cooling towers
Gate valveSoft joint
Water lter
Pump
Water treatment device
② Cooling towers and pumps
a) Select the cooling tower capacity based on the system’s water circulation volume.
b) The unit water system must select the closed cooling tower.
c) Circulating Pump is generally vertical pipeline pump. It is according to the length of the
pipe and drag to select a pump head. To ensure system security, water pump should remain a
standby pump.

11
Product introduction
④ Cooling water pipe system
Attention:
Recommend Y-Water lter
1. Inlet of water
2. Outlet of water
3. Y-shape lter
4. Flow swich
5. Connection port to draining piping
6. Drain valve
7. Air purge
8. Water piping socket
9. Refrigerant gas side
10. Refrigerant liquid side
11. Oil balance connecting pipe
12. Power wire and pump control line
13. Communication wire and ow
switch control line
1. Install a Y-shape water lter in the inlet of water piping within a distance of 1.5 m from the
outside unit.
Filter demand
Water pipe Pipe size of lter Liquid Max. pressure recommended mesh
DN32 1 1/4 inch Water 1.6 MPa 40/inch
1
2
7
9
10
11
12
13
3
5
6
8
4

12
Product introduction
2. Insulation should be installed on the water inlet/outlet to prevent condensate water or icing;
3. Water in heat exchanger should all be drained out during long shutdown in the winter to avoid
icing;
4. The diameter of water pipe should be the same as the diameter of unit connection (1-1/4 inch)
or larger.
5. Water ow switch should be installed on the heat exchanger water outlet pipe to operate cut-
off protection.
6. When there are many units in the Water Cooled VRF, in order to guarantee an equalized
water allocation among each unit, reversed return system should be used in water supply and
water return;
7. Install a gate valve for chemical cleaning in an easy position to handle.
8. Run the water pump to ush inside of water piping. Then, clean the strainer.
9. When install the unit, the upper unit must add water pans, prevent water owing into the lower
unit.
10. When connect the water pipe, the water must through the water inlet into the double-pipe
heat exchange, otherwise the unit performance will become worse.
11. The pump is installed in the water system need starter. The unit only offers the pump control
signal, doesn’t offer the pump power supply.
12. Between the welding mouth of double-pipe heat exchanger and site pipe should use exible
joint, to reduce the vibration.
13. For the convenience of maintenance and repair, install the hydraulic pressure gauge and
thermometer at the inlet and outlet pipe mouth.
14. The pipe and the joint need independent supporting, the supporting is not the unit.
15. All the connection pipes connected to the double-pipe heat exchanger should separate
cleaning before connecting, in order to avoid the foreign body into the heat exchanger.
16. In the system all may freeze pipes shall be heat preservation.
17. Pipe connecting need follow corresponding installation procedures. All pipes must be in line
with the local plumbing codes and regulations.
18. Pipe size should be equal to or greater than the interface unit size (DN32).
19. All the low position of the water system need to install drain valve, the water in the double-
pipe heat exchanger and the system can be completely ruled out.
20. Water ow should not exceed the range in the following table, or failures may occur.
Capacity Water ow range (m³/h)
8HP 2.4-7.2
10HP 3.0-9.0
12HP 3.6-10.8

13
Product introduction
⑤ Auxiliary Thermal Source:
In winter, circulating water temperature is maintained from 15 to 25°C. When in heating mode,
the water temperature will drop down gradually, so there should have auxiliary heating source
to maintain the water temperature in rating range. There are many types of auxiliary heating
source, such as boiler, wasted heating source from factory, or civilian steam system. Below
diagram shows the piping work when system runs in heating mode in winter.
The connection of thermal source and cooling tower:
Electronic treatment device
TCV
Water pump Water lter
Expansion tank
Gate valve 1
Gate valve 3
Gate valve 2
Heat exchanger
Circulation water inlet
Heat source
Circulation water outlet
Cooling towerConnecting hose
Gate valve
Pressure gauge
Flexible connection
Drainage valve
Motorized valve
Y-shape lter
Thermometer
Flow swich
water pan
System water return pipe
System water supply pipe To the drainage tank

14
Product introduction
⑥ Use guide and maintenance of tube-in-tube heat exchanger
Cautions in the process of using tube-in-tube:
1. The thread specication for inlet and outlet water pipe is G1-1/4.
2. To avoid foreign body into the system impacting performance and even leading to the
corrosion of the double-pipe heat exchanger, must connect water lter unit in the feed line
attachment, recommend mesh is 40 mesh per inch. And please according to the situation of
water quality, regular cleaning lter.
3. Should be used water pipe in accordance with local and national laws and regulations, water
pipe size is not less than double-pipe heat exchanger interface size (DN32).
4. In winter, if you don’t use for long time, be sure to discharge all the water in the system to
prevent frost crack system and close the power supply.
5. The water inside the double-pipe heat exchanger can be discharged through drain valve near
inlet water of the double-pipe heat exchanger.
6. According to the different tube heat exchanger and pipe scaling of water system, regular
clean the heat exchanger and water system to remove scale.
Suggestion: the water system set isolation valves in the appropriate position; it is convenient
to connect cleaning system.
Cleaning of heat exchanger
Return pipe valve
Heat exchanger
Inlet pipe valve
Isolation Valve Cleaning solution
Flow direction Acid proof pump

15
Product introduction
7.The conguration of the cleaning solution
Recommended acid lotion: oxalic acid 5%, relievers 1.2%, surfactant 0.8%, acid pickling
temperature 60°C, in this condition the cleaning effect is better.
When use hydrochloric acid to clean the system, in order to avoid corrosion and shorten the
life of the heat exchanger, the concentration of hydrochloric acid should be limited to 3% -5%,
and added at a concentration of 0.2% -0.3% of the release agent. When cleaning, the timely
detection of PH value, when PH = 8, immediately stop cleaning, and then replace it by water.
8. Cleaning method
a) Before connecting the cleaning system must stop unit, turn off the water system circulating
pump, shut down the sluice valve on inlet and return water pipe, shut down the drain valve
and vent valve of the heat exchanger.
b) The ow directions of cleaning solvent and heat exchanger refrigerant are opposite.
c) Pickling: check the system is leak-free, Open the water pump and ll acid solution, turn off
the pump, soaked 2h. open the pump runs continuously and stop 3-4 times. During start the
water pump 0.5h /time. In the pickling process should be timely testing acid concentration,
when the difference value between two adjacent test concentrations below 0.2%, stop
pickling and discharge the waste pickling liquid into the waste tank.
d) Neutralizing: after pickling, mixed NaOH, Na3P04, and softened water in certain proportion,
using dynamic circulation method to alkali wash the heat exchanger reach neutralization.
Discharge the neutralized waste discharged into the waste tank.
e) Water washing: After neutralization, with clean softened water repeatedly ush the heat
exchanger 0.5h, and rinse residue inside the heat exchanger thoroughly. Discharge the waste
water into the waste tank.
f) Passivating: the casing heat exchanger is exposed to air for 3-4 h, or use the high-pressure
air purging 2 h. generate passivation layer on surface.
g) After nish the cleaning, close the isolation valve, dismantling cleaning systems and
equipment, and keep it aside.
h) Please contact the waste collection company to disposal the waste liquid.
i) Reconnect the unit water system, and then check if the unit can work normally.
9. Warning about the cleaning
a) The ow direction of the cleaning solution must be the same as requirement.
b) Because the water quality and heat exchangers are used in of different occasions, the
cleaning methods and periodicity may differ, this method is only for reference
c) You can not use nitric acid as a cleaning agent.
d) Cleaning solution and chemical solution is bad for eyes and skin, cleaning process needs
good protection.
e) Please invite professional cleaning personnel to operate.
10. The quantity of circulating water should meet the requirement, If antifreeze added , the
one reactive with Zn ( e.g. antifreeze with ethylene glycol) should not be chosen, or it will
accelerate corrosion.

16
⑦Refrigerant piping system
Specications
Pipe diameter:19.05mm
Flared inner
diameter:22.4mm
Total lenght:200mm
1. Gas pipe valve
2.Liquid pipe valve
3. Service valve
4 oil pipe valve
5.Water outlet connection
6.water inletconnection
7.SV11
8.SV1
9. SV10
10. SV9
11. LEVA1
12. LEVA2
Adaptor should be xed on the gas stop valve except 8HP model,and the Maximum length
should be below 500mm, or it will affect the capacity,and adaptor on liquid stop volve need be
made on site.
Attention should be paid to the location of electronic expansion valve and solenoid valve during
maintenance.
Adaptor
Product introduction
1
7
2
8
3
9
4
10
5
11
12
6

17
Exterior and installation dimensions
775
995
1. 8~12HP exterior and installation dimensions
100100
72
443
548
605
Ø13 through-hole
Foundation
72
443
548
605
Ø13 through-hole
Foundation
200
Ø10 Expansion bolt
Concrete
foundation
Rubber cushion
Solid ground or roof
Over 300 Over 300
Over 500
Note:
Rubber cushion's cross sectional area should be greater than 3cm2 or may lead to sheet metal
deformation.
545

18
A. Sites for one outdoor unit
Exterior and installation dimensions
B. Sites for two outdoor units
Front
Over 500mm
Over 900mm
Over 1970mm
Over
300mm
Over
300mm
Over 1375mm
995 995
775 775
Over
300mm
571
Over 1850mm