Midea Two-Way Cassette The 2nd Generation DC VRF Indoor Unit User Manual

Two-Way Cassette The 2nd Generation DC VRF Indoor Unit

Installation and Operation Manual
Two-way Cassette
The 2nd generation DC VRF indoor unit
Original instructions Thank you very much for purchasing our air conditioner. Before using your air conditioner, please read this manual carefully and keep it for future reference.

Contents Installation Manual……………………………………………………………………1

· Make sure the power cord, communication and controller wiring are straight and level when you are working on the connections, and the

Accessories…………………………………………………………………………….3 1. Before Installation ………………………………………………………………4 2. Choosing an Installation Site ………………………………………………4 3. Indoor Unit Installation…………………………………………………………4

cover on the electric box is tight. If the electric box is not closed properly, it may lead to electric shock, fire or overheating of electrical components. · If the refrigerant leaks during installation, open the doors and windows immediately to ventilate the area. Refrigerant can produce

4. Refrigerant Piping Installation ………………………………………………8 5. Water Discharge Piping Installation ………………………………………9 6. Electrical Wiring ………………………………………………………………..9 7. On-site Configuration ……………………………………………………… 12 8. Test Run………………………………………………………………………… 13 9. Part Names …………………………………………………………………… 14 10. The Explain Of The Display Panel……………………………………….15 11. Air Conditioner Operations and Performance ……………………… 15

toxic gases when in contact with fire. · Switch off the power supply before touching any electrical
component. · Do not touch the switch with wet hands. This is to prevent electrical
shocks. · Do not come in direct contact with the refrigerant leaking from the
connections of refrigerant piping. Otherwise, it may lead to frostbite. · The air conditioner must be grounded. Do not connect the earth line
(ground) to gas piping, water piping, lightning rods or telephone earth lines. Improper grounding can lead to electric shock or fire,

12. Adjusting Air Flow Direction ……………………………………………… 16

and may cause mechanical failure due to current surges from

13. Maintenance…………………………………………………………………… 16 14. Symptoms That Are Not Faults ………………………………………… 17 15. Troubleshooting ……………………………………………………………… 17

lightning and so on. · The earth leakage circuit breaker must be installed. There is a risk
of electric shock or fire if the earth leakage circuit breaker is not installed.

Installation Manual
Safety Precautions Read carefully before you install the air conditioner to make sure that the installation is correct.

· The appliance shall be installed in accordance with national wiring regulations.
· The appliance must be installed 2,3m above floor.
· If the supply cord is damaged, it must be replaced by the manufacturer or its service agent or a similarly qualified person in

There are two types of precautions as described below: Warning: Failure to comply may lead to death or serious injury. Caution: Failure to comply may lead to injury or damage of the
unit. Depending on the situation, this may also lead to serious injury. Once the installation is completed, and the unit has been tested and

order to avoid a hazard.
· An all-pole disconnection switch having a contact separation of at least 3mm in all poles should be connected in fixed wiring.
· The temperature of refrigerant circuit will be high, please keep the interconnection cable away from the copper tube.

verified to be operating normally, please explain to the customer how to use and maintain the unit according to this manual. In addition, make sure that the manual is kept properly for future reference.

· The power cord type designation is H05RN-For above/H07RN-F. · Check the power supply before installation. Ensure that the power
supply must be reliably grounded following local, state and National

Electrical Codes. If not, for example, if the ground wire is detected

Warning

charged, installation is prohibited before it is rectified. Otherwise, there is a risk of fire and electric shock, causing physical injury or

· Installation, maintenance and cleaning the filter work must be carried out by professional installers. Refrain from doing it yourself. Improper installation may cause water leakage, electric shock, or fire.
· Install the air conditioner according to the steps described in this manual. Improper installation may cause water leakage, electric shock, or fire.
· For installation in smaller rooms, you must adopt the relevant measures to prevent the refrigerant concentration from exceeding

death.
· Check the electric wire, water and gas pipeline layout inside the wall, floor and ceiling before installation. Do not implement drilling unless confirm safety with the user, especially for the hidden power wire. An electroprobe can be used to test whether a wire is passing by at the drilling location, to prevent physical injury or death caused by insulation broken cords.

the limit. Please consult the sales agent on the relevant measures required. A high concentration of refrigerant in an airtight space can cause oxygen insufficiency (anoxia). · Make sure the required parts and accessories are installed. Using unspecified parts may cause the air conditioner to malfunction or drop, as well as water leakage, electric shock, and fire. · Mount the air conditioner in a place that is sturdy enough to bear its weight. If the base is not secured properly, the air conditioner may drop leading to damages and injuries. · Take in full consideration to the effects of strong winds, typhoons and earthquakes, and reinforce the installation. Improper installation may cause the air conditioner to drop leading to accidents. · Make sure a standalone circuit is used for the power supply. All electrical parts must comply with the local laws and regulations, and what is stated in this installation manual. The installation works must be carried out by a professional and qualified electrician. Insufficient capacity or improper electrical works can lead to electric shock or fire. · Use only electrical cables that fulfil the specifications. All wiring on site must be carried out in accordance with the connection diagram

Caution
· Install the water discharge piping according to the steps described in this manual, and make sure that the water discharge is smooth, and the piping is properly insulated to prevent condensation. Improper installation of the water discharge piping may lead to water leakage, and damage the indoor furniture.
· When mounting the indoor and outdoor units, make sure the power cord is installed at a distance of at least 1 m away from any TV or radio so as to prevent noise or interference with the images.
· The refrigerant required for the installation is R410A. Make sure the refrigerant is correct before installation. Incorrect refrigerant may cause the unit to malfunction.
· Do not install the air conditioner in the following places: 1) Where there is oil or gas, such as the kitchen. Otherwise, the plastic parts may age, fall off or water may leak. 2) Where there are corrosive gases (such as sulphur dioxide). Corrosion in the copper pipes or welded parts may cause the refrigerant to leak.

attached to the product. Make sure that there are no external forces

acting on the terminals and wires. Improper wiring and installation

may cause a fire.
1

3. Where there are machines emitting electromagnetic waves. Electromagnetic waves may interfere with the control system, causing the unit to malfunction.
4. Where there is a high salt content in the air. When exposed to air with a high salt content, the mechanical parts will experience accelerated ageing which will severely compromise the service life of the unit.
5. Where there are major voltage fluctuations. Operating the unit using a power supply system that has large voltage fluctuations will reduce the service life of the electronic components, and cause the unit’s controller system to malfunction.
6. Where there is a risk of leakage of flammable gases. Examples are sites that contain carbon fibres or combustible dust in the air, or where there are volatile combustibles (such as diluent or petrol). The above gases may cause explosion and fire.
7. Do not touch the fins of the heat exchanger as this may lead to injury.
8. Some products use the PP packing belt. Do not pull or tug on the PP packing belt when you transport the product. It will be dangerous if the packing belt breaks.
9. Note the recycling requirements for nails, wood, carton and other packaging materials. Do not discard these materials directly as these may lead to bodily harm.
   10)Tear up the packaging bag for recycling to prevent children from playing with it, and leading to suffocation.
   11)The appliance shall not be installed in the laundry.
   2

Accessories

Verify that the air conditioner includes the following accessories.

Code

Name

1

Installation Manual

2

Nut

3

Washer

4

Insulation casing for copper pipe

5

Bolt (M6)

6

Connecting wire group

7

Insulation casing for copper pipe

8

Foam (250x250x10)

9

Foam (60x100x5)

10

Insulation casing for water discharge piping

11

Ring clamp for water discharge pipe

12

Tie for water discharge piping

13

Soft flexible hose for water discharge

14

Brass nut

Appearance

Qty

1

8

8

1

4 1 1

1 1 1

1 5 1 1

Accessories to purchase locally

Code Name

Appearance

1

Copper pipe

2

PVC pipe for water discharge

Insulation

3

casing for

piping

4

Expansion hook anchor

5

Mounting hooks

Dimensions
Choose and purchase copper pipes that correspond to the length and size calculated for the selected model in the installation manual of the outdoor unit and your actual project requirements.

Qty
To purchase based on actual project requirements.

Outer diameter: 37-39 mm, inner diameter: 32 mm
The inner diameter is based on the diameter of the copper and PVC pipes. The thickness of the pipe casing is 10 mm or more. Increase the thickness of the casing (20 mm or thicker) when the temperature exceeds 30°C or the humidity exceeds RH80%.

To purchase based on actual project requirements.
To purchase based on actual project requirements.

Note
Use to connect indoor refrigerant piping.
Use to discharge condensed water from the indoor unit.
Protect piping from condensation.

For installation

M10

4

of indoor unit

M10

4

For installation

of indoor unit

3

1. Before Installation
1. Determine the route to move the unit to the installation site. 2. First unseal and unpack the unit. Then hold on to the seats of the
hanger (4 pcs) to move the unit. Refrain from exerting force on other parts of the unit, especially the refrigerant piping, water discharge piping, and plastic parts.
2. Choosing an Installation Site
1. Choose a site that fully complies with the following conditions and user requirements to install the air conditioning unit.
Well ventilated. Unobstructed airflow. Strong enough to bear the weight of the indoor unit. Ceiling has no obvious slant. There is sufficient space for repair and maintenance work to be
carried out. No leakage of flammable gas. The length of the piping between the indoor and outdoor units is
within the permitted range (refer to the manual on installation of the outdoor unit). 2. Mounting height Mounting height is 2.5 ~ 3.5 metres. 3. Mount using the mounting screws. 4. Space required for installation (unit (mm)):

100

100

Figure 2.1

5. Based on the shape of the room, determine the airflow directions for the installation site. See Figure 2.3 for the schematic on the direction of airflow.
Figure 2.3
3. Indoor Unit Installation
Make sure that only specified components are used for the installation works. 3.1 Installation with lifting bolts Use different bolts for the installation depending on the installation environment.
Wooden structure Secure the square rod on the beam to set
the lifting bolts. Square bar material
Beam

Lifting bolt

Ceiling

Figure 3.1

Ceiling

Original concrete slab structure

1500

1500

Use embedded bolts, and pull bolts.

2500mm 1000 350

Floor

Figure 2.2

4

Figure 3.2

Steel framework Directly set and use an angled steel rod for support.
Suspension bolt

Suspension bolt

Angled rod for support

Figure 3.3
Newly set concrete slab structure
Set using embedded appliances, and embedded type of bolts.

2. Install the hooks in four corners based on the layout for the hooks outlined in the installation board (accessory 4).
Determine the location on the ceiling of the room or building roof for mounting, and drill four 12 mm X 50-55 mm holes. Then embed and set up the expansion hook anchors (purchased accessory 4) in these holes. See Figure 3.2.
During the installation of the hooks (purchased accessory 5), make sure that the concave portion of the hanger corresponds to that of the expansion hook anchors. Determine the appropriate hook length for installation based on the ceiling’s height. Remove any excess.
Use M10 or W3/8/ bolts for the screws of the mounting hooks. Take approximately 1/2 of the screw length for the installed hooks
as the excess length.
Top

Knife-type insertion piece

Sliding-type insertion piece
Reinforced bar
Embedded bolt (hanging and embedded
bolt for piping)

Figure 3.4

Caution
· All bolts should be made from high quality carbon steel (with galvanized surface or other rust prevention treatment) or stainless steel.
· How the ceiling should be handled will differ with the type of building. For specific measures, please consult the building and renovation engineers.
· How the lifting bolt should be secured depends on the specific situation, and it must be secure and reliable.

3.2. Indoor Unit Installation
3.2.1 Installation sequence for existing ceiling: Must maintain the ceiling at a level position.
1. Drill 1390 mm x 640 mm holes into the ceiling based on the layout of the installation board (accessory 4). See Figure 3.5.
The centre of the ceiling opening should match the centre of the body of the indoor unit.
Determine the length and outlets of the connecting pipes, water discharge piping and the electrical wiring.
In order to keep the ceiling level and prevent vibrations, reinforce the strength of the ceiling when necessary.

The panel contour dimension 1430

20

The ceiling opening dimension 1390

20

The ceiling opening (1390*640)

Hanging screw bolts distance 1207 Machine body size 1172

Figure 3.6
3. Use the hex nuts on the four mounting hooks to adjust and make sure that the unit body is level.
If the water discharge pipe is slanted, it may cause the water level switch to malfunction, and water may leak.
Adjust the position of the unit body, and make sure that the gap with the ceiling is evenly spaced on all four sides of the ceiling, and the base of the unit body is 24-26 mm into the base of the ceiling.
Once the position of the unit body is adjusted, use the nuts on the mounting hooks to secure the unit.

Air conditioner body
Air conditioner frame

Air conditioner body

Ceiling

10~12mm

Figure 3.7
3.2.2 Installation sequence for new ceiling:
1. Refer to Step 2 of the “Installation sequence for existing ceiling”. Pre- bury the hooks in the new ceiling, and make sure that they are strong enough to bear the weight of the indoor unit, and that the unit will not become loose when the concrete shrinks.
2. Once you have lifted and mounted the unit, use M6x12 screws (accessory 5) to secure the installation board (accessory 4) on the unit body. Make sure you verify the size and positions of the opening in the ceiling before you do so. See Figure 3.8.
Before you mount the unit onto the ceiling, make sure the ceiling is level.
The rest of the procedures are the same as Step 2 of the “Installation sequence for existing ceiling”.
3. Refer to Step 3 of the “Installation sequence for existing ceiling”. 4. Remove the installation board (accessory 4).

The panel contour dimension 680
The ceiling opening dimension 640 20 Machine body size 591 Hanging screw bolts distance 520

Figure 3.5
5

Pattern paper

Panel fixing screw (M4X16) Figure 3.8

Caution
· Make sure that the unit body is level; otherwise, it may cause water to leak. Calibrate the levelness of the unit using a spirit level or polyethylene tube filled with water.
· The unit is equipped with a built-in water discharge pump and float switch. Do not tilt the unit in the direction of the drain pan; otherwise, the float switch may malfunction and cause water leakages.

Dimensions of unit 57

1172 701

129 129

3.3 Panel Installation 3.3.1 Remove the stickup foam from the air inlet grille. 3.3.2 Remove the air inlet grille (1) Lift one side of the air inlet grille (no directionality), and
press the other side down. Then slide in the direction of the arrow as shown in Figure 3.12. Inhalation grating
Figure 3.12 (2) Take and press down one side of the suspension buckle
as shown in Figure 3.13.
Figure 3.13 (3) Open the air inlet grille to about 45°, and then open the other
side of the suspension buckle as shown in Figure 3.14.

32

45

151 44 192 299

32

1430 Top view Figure 3.9

591

436

241

185

44

120 104 91

299 176 171 91 51

42~45

680
Side view Figure 3.10

Mounting hooks

Hex nut (to adjust level)

Panel

Master air conditioner

Surface of the opening ceiling

Figure 3.11

150mm

Figure 3.14
Caution
· Do not place the panel such that it faces downwards or leans against the wall. Do not place it on a protruding object either.
· Do not hit or squeeze the air deflector.
3.3.3 Panel installation (1) Align the air deflector at the swing motor with the
corresponding copper pipe connection and water discharge connection of the unit body. (2) Place two positioning bolts (from panel accessories) and install them at the corresponding positions of the unit body, as shown in Figure 3-15 (tighten in the bolts by about 10 cm). (3) Hang the frame setting plates on the panel on the two bolts described in step (2) above (it will be easier to start with the water discharge side). (4) Reverse to remove the positioning bolts installed in step (2), and take out the other two bolts from the panel accessories. (5) Turn to tighten the four bolts. The mounting position is as shown in Figure 3.16. Secure the panel to the unit body, and make sure that there is no gap between the panel and ceiling.
6

Piping side Bolt
Air deflector for swing motor
Bolt

Figure 3.15

Bolt
Edge setting plates

3.3.4 Remove the lid from the electric control box, and connect the swing motor and display panel to the electric control box. Cover the lid, and tighten the two screws. 3.3.5 Reinstall the air inlet grille by performing the steps used to remove the air inlet grille in the reverse order. Adjust to the appropriate position. 3.3.6 If you need to adjust the air deflector, use the following steps to remove and install the air deflector:
(1) Remove the air deflector. Make sure that the air deflector is level, press one end of the air deflector at where the buckle is, and the buckles in the middle and at the other side will also fall off. Remove the air deflector as shown in Figure 3-19.
(2) Install the air deflector. Repeat the steps used to remove the air deflector (1) in reverse order to install the air deflector. As shown in Figure 3-20.

Wind leading strip

Press

Bolt
Figure 3.16
Caution · To prevent air and water leakages, make sure there is no gap
between the ceiling, panel, and unit body. See Figure 3.17 and Figure 3.18. · As long as it does not affect the lifting and lowering of the indoor unit and the water discharge piping, you can use the hex nuts on the four corners of the panel boom to adjust the height of the indoor unit.

Figure 3.19
Pot-head Drive retainer

Interval

Droplets of condensed water, dripping water. Figure 3.17

Interval
Droplets of condensed water, dripping water. Figure 3.18
7

Figure 3.20

4. Refrigerant Piping Installation
4.1 Length and Level Difference Requirements for the Piping Connections to the Indoor and Outdoor Units The length and level difference requirements for the refrigerant piping are different for different indoor and outdoor units. Refer to the installation manual of the outdoor unit.
4.2 Piping Material and Size 1. Piping material: Copper pipes for air handling. 2. Piping size: Choose and purchase copper pipes that correspond to the
length and size calculated for the selected model in the installation manual of the outdoor unit and your actual project requirements.
4.3 Piping Layout 1. Seal the two ends of the piping properly before you connect the indoor and
outdoor piping. Once unsealed, connect the piping of the indoor and outdoor units as quickly as possible to prevent dust or other debris from entering the piping system via the unsealed ends, as this may cause the system to malfunction. 2. If the piping needs to go through walls, drill the opening in the wall, and place accessories like casings and covers for the opening properly. 3. Place the refrigerant connecting piping and the communication wiring for the indoor and outdoor units together, and bundle them tightly to make sure air does not enter and condensate to form water that may leak from the system. 4. Insert the bundled piping and wiring from outside the room through the wall opening into the room. Be careful when you lay out the piping. Do not damage the piping.
4.4 Piping Installation · Refer to the installation manual attached with the outdoor unit on installation
of the refrigerant piping for the outdoor unit. · All gas and liquid piping must be properly insulated; otherwise, this may cause
water to leak. Use heat insulation materials that can withstand high temperatures above 120°C to insulate the gas pipes. In addition, the insulation of the refrigerant piping should be reinforced (20 mm or thicker) in situations where there is high temperature and/or high humidity (when part of refrigerant piping part is higher than 30°C or when the humidity exceeds RH80%). Otherwise, the surface of the heat insulation material may be exposed. · Before the works are carried out, verify that the refrigerant is R410A. If the wrong refrigerant is used, the unit may malfunction. · Other than the specified refrigerant, do not let air or other gases enter the refrigeration circuit. · If the refrigerant leaks during installation, make sure you fully ventilate the room. · Use two wrenches when you install or dismantle the piping, a common wrench and a torque wrench. See Figure 4.1.
Normal wrench Torque wrench Pipe socket cap

Pipe fittings Figure 4.1
Slot the refrigerant piping into the brass nut (accessory 14), and expand the pipe socket. Refer to the following table for the size of the pipe socket and the appropriate tightening torque.

External diameter (mm)

Tightening torque

Flared opening diameter (A)

6.35

14.2-17.2N·m

8.3-8.7mm

9.53

32.7-39.9N·m

12-12.4mm

12.7

49.5-60.3N·m 15.4-15.8mm

15.9

61.8-75.4N·m

18.6-19mm

19.1

97.2-118.6N·m 22.9-23.3mm

Flared opening
90°±4 A 45°±2 R0.4 ~ 0.8
Figure 4.2

Caution
· Apply the appropriate tightening torque according to the installation conditions. Excessive torque will damage the socket cap, and the cap will not be tight if you apply insufficient torque, leading to leakages.

Before the socket cap is installed on the pipe socket, apply some refrigerant oil on the socket (both inside and outside), and then rotate it three or four times before you tighten the cap. See Figure 4.3. Apply refrigerant oil

Figure 4.3

Precautions to take when welding the refrigerant pipes

· Before you weld the refrigerant pipes, fill the pipes with nitrogen first to discharge the air in the pipes. If no nitrogen is filled during welding, a large amount of oxide film will form inside the piping which may cause the air conditioning system to malfunction.
· Welding can be carried out on the refrigerant pipes when the nitrogen gas has been replaced or refilled.
· When the pipe is filled with nitrogen during welding, the nitrogen must be reduced to 0.02 MPa using the pressure release valve. See Figure 4.4.

1 Copper piping

2 Section being brazed

3 Nitrogen connection

4 Hand valve

Figure 4.4

5 Pressure-reducing valve 6 Nitrogen

4.5 Air Tightness Test Carry out the air tightness test on the system according to the instructions in the installation manual of the outdoor unit.
Caution
· The Air Tightness Test helps to ensure that the air and liquid cut-off valves of the outdoor unit are all closed (maintain the factory defaults).

4.6 Heat Insulation Treatment for Gas-Liquid Piping Connections

for the Indoor Unit The heat insulation treatment is carried out on the piping at the gas and

liquid sides of the indoor unit respectively.

a. The piping on the gas side must use heat insulation material that can

withstand temperatures of 120°C and more.

b. For the piping connections of the indoor unit, use the insulation casing

for copper pipes (accessory 7) to carry out the insulation treatment,

and close all gaps.

Face upwards

Unit body

On-site piping Attached insulation side heat pump belt

Figure 4.5

4.7 Vacuum Create a vacuum in the system according to the instructions in the installation manual of the outdoor unit.

Caution
· For the vacuum, make sure that the air and liquid cut-off valves of the outdoor unit are all closed (maintain the factory status).

4.8 Refrigerant Charge the system with refrigerant according to the instructions in the installation manual of the outdoor unit.

8

5. Water Discharge Piping Installation
5.1. Water Discharge Piping Installation for Indoor Unit
1. Use PVC pipes for the water discharge pipes (outer diameter: 37~39 mm, inner diameter: 32 mm). Based on the actual installation circumstance, users can purchase the appropriate piping length from sales agent or local after- sales service centre, or purchase directly from the local market.
2. Insert the water discharge pipe into the end of the water suction connecting pipe of the unit body, and use the ring clamp (accessory 11) to clamp the water discharge pipes with the insulation casing for the water outlet piping securely.
3. Use the insulation casing for water discharge piping (accessory 10) to bundle the water suction and discharge pipes of the indoor unit (especially the indoor portion), and use the tie for the water discharge piping (accessory 12) to bind them firmly to make sure air does not enter and condense.
4. In order to prevent the back-flow of water into the interior of the air conditioner when the operation stops, the water discharge pipe should slope downwards towards the outside (drainage side) at a slope of more than 1/100. Make sure that the water discharge pipe does not swell or store water; otherwise, it will cause strange noises. See Figure 5.1.
5. When connecting the water discharge piping, do not use force to pull the pipes to prevent the water suction pipe connections from coming loose. At the same time, set a supporting point at every 0.8~1 m to prevent the water discharge pipes from bending. See Figure 5.1.

5.2 Water Discharge Test
Before the test, make sure that the water discharge pipeline is smooth, and check that each connection is sealed properly.
Conduct the water discharge test in the new room before the ceiling is paved.
1. Remove the test water cap to connect to the test water outlet, and use the water injection pipe to inject 2000 ml of water into the drain pan.
Drainage outlet for water pump
Opening for test water injection and water level switch check Water injection pipe

Maintenance plug for water discharge

Figure 5.3

0.8 ~ 1.0 m

Slope of 1/100 or more

1.0 m
Figure 5.1

2. Connect the power supply, and set the air conditioner to operate in the cool mode. Check the running sound of the drainage pump, as well as whether water is properly drained from the drainage outlet.
3. Stop the air conditioner. Wait for three minutes, and then check if there is anything unusual. If the water discharge piping layout is not correct, the excessive water flow will cause the water level error and “EE” error code will be displayed on the display panel. There may even be water overflowing from the water pan.
4. Continue to add water until the alarm for excessive water levels is triggered. Check if the drainage pump drains water immediately. After three minutes, if the water level does not fall below the warning level, the unit will shut down. At this time, you need to turn off the power supply, and drain away the accumulated water before you can turn on the unit normally.
5. Turn off the power supply, remove the water manually using the drainage plug, and put the test cap back to the original place.

6. When connecting to a long water discharge pipe, the connections must be covered with the insulation casing to prevent the long pipe from coming loose.
7. When the outlet of the water discharge pipe is higher than the pipe connection for water suction, try to keep the water discharge pipe as vertical as possible, and the water outlet connecting fittings will bend so that the height of the water discharge pipe should be within 1000 mm away from the base of the drain pan. Otherwise, there will be excessive water flow when the operation stops. See Figure 5.2.

Water discharge pipes from multiple units are connected to the main water discharge pipe to be discharged through the sewage pipe.

Below 200 mm

Below 200 mm 50 ~ 100 mm

50 ~ 100 mm Below 200 mm

50 ~ 100 mm

Water outlet pipe fittings

Main water outlet pipe

Slope of 1/100 or more
Figure 5.2

All are below 1000 mm

8. The end of the water discharge pipe must be more than 50 mm above the ground or from the base of the water discharge slot. Besides, do not put it in the water.

Caution
· Make sure all the connections in the piping system are properly sealed to prevent water leakages.

Caution
· The drainage plug at the bottom of the unit body is used to discharge accumulated water from the drain pan when the air conditioner malfunctions. When the air conditioner is operating normally, make sure the drainage plug is properly plugged to prevent water from leaking.
6 Electrical Wiring
Warning
· All the supplied parts, materials and electrical works must comply with local regulations.
· Use only copper wires. · Use a dedicated power supply for the air- conditioners. The power voltage
must be in line with the rated voltage. · The electrical wiring works must be carried out by a professional technician,
and must comply with the labels stated in the circuit diagram. · Before the electrical connection works are carried out, turn off the power
supply to prevent injuries caused by electric shock. · The external power supply circuit of the air conditioner must include an
earth line, and the earth line of the power cord connecting to the indoor unit must be securely connected to the earth line of the external power supply. · Leakage protective devices must be configured according to the local technical standards and requirements for electrical and electronic devices. · The fixed wiring connected must be equipped with an all-pole disconnection device with a minimum 3 mm contact separation. · The distance between the power cord and signalling line must be at least 300 mm to prevent the occurrences of electrical interference, malfunction or damage to electrical components. At the same time, these line must not come in contact with the piping and valves. · Choose electrical wiring that conforms to the corresponding electrical requirements. · Connect to the power supply only after all the wiring and connection works have been completed, and carefully checked to be correct.
9

6.1 Power Cord Connection

Use a dedicated power supply for the indoor unit that is different from the

power supply for the outdoor unit. Use the same power supply, circuit breaker and leakage protective device

for the indoor units connected to the same outdoor unit.

Outdoor power supply

RCCB Grounding line

Grounding line

Wire slot

Indoor power supply
RCCB

Indoor unit

Communication wire between indoor and outdoor units

Figure 6.1 Figure 6.2 shows the power supply terminal of the indoor unit.

LN

POWER INPUT Figure 6.2

When connecting to the power supply terminal, use the circular wiring terminal with the insulation casing (see Figure 6.3).

Use power cord that conforms to the specifications and connect the power cord firmly. To prevent the cord from being pulled out by external force, make sure it is fixed securely.

If circular wiring terminal with the insulation casing cannot be used,

please make sure that:

· Do not connect two power cords with different diameters to the

same power supply terminal (may cause overheating of wires due

to loose wiring) (See Figure 6.4).

: Copper wire

Circular wiring terminal

Proper power wiring connections Insulation tube
Power cord

Figure 6.3

6.2 Electrical Wiring Specifications

220-240V~50/60Hz 220-240V~50Hz Power supply

Indoor unit

LN
Breakers with current leakage

Figure 6.4 Indoor unit

Table 6.1

Model
Power supply

Phase Volt and frequency

Communication wire between indoor and outdoor units
Communication wire between indoor unit and wired controller *

2.2-7.1kW 1-phase 220-240V~50Hz 220-240V~50/60Hz
Shielded 3×AWG16-AWG18
Shielded AWG16-AWG20

Field fuses

15A

• Please refer to the corresponding wired controller manual for the wired controller wiring.
  Table 6.2 Indoor units electrical characteristics

Capacity

Power supply

IFM

Hz

Volts MCA MFA kW FLA

2.2KW

0.47 15 0.1 0.38

2.8KW 3.6KW 4.5KW 5.6KW 7.1KW

0.47 15

50 50/60

0.52 220-240
0.59

15 15

0.9 15

1.3 15

0.1 0.38 0.1 0.42 0.1 0.47 0.1 0.72 0.1 1.04

Abbreviations: MCA: Minimum Circuit Amps MFA: Maximum Fuse Amps IFM: Indoor Fan Motor kW: Rated motor output FLA: Full Load Amps

1. Select the wire diameters( minimum value) individually for each unit based on the table 6.3.
2. Maximum allowable voltage range variation between phases is 2%.
3. Select circuit breaker that having a contact separation in all poles not less than 3 mm providing full disconnectionwhere MFA is used to select the current circuit breakers and residual current operation breakers:
Table 6.3

Rated current of appliancecA
3 >3 and 6 >6 and 10 >10 and 16 >16 and 25 >25 and 32 >32 and 50 >50 and 63

Nominal cross-sectional area (mm2 )

Flexible cords 0.5 and 0.75 0.75 and 1
1 and 1.5 1.5 and 2.5 2.5 and 4 4 and 6 6 and 10 10 and 16

Cable for fixed wiring

1

to 2.5

1

to 2.5

1

to 2.5

1.5 to

4

2.5 to

6

4

to 10

6

to 16

10 to 25

All-pole disconnection device with leakage protector

Pull box

Pull box Pull box

Warning
Refer to local laws and regulations when deciding on the dimensions for the power cords and wiring. Get a professional to select and install the wiring.

Indoor unit

Indoor unit

Indoor unit

Figure 6.5

Refer to Tables 6.1 and 6.2 for the specifications of the power cord and communication wire. A wiring capacity that is too small will cause the electrical wiring to become too hot, and lead to accidents when the unit burns and becomes damaged.

6.3 Communication Wiring Use only shielded wires for the communication wiring. Any other type of wires
may produce a signal interference that will cause the units to malfunction. Do not carry out electrical works like welding with the power on. Do not bind the refrigerant piping, power cords and communication wiring
together. When the power cord and communication wiring are parallel, the distance between the two lines must be 300 mm or more in order to prevent signal source interference. Communication wiring must not form a closed loop.
6.3.1 Communication wiring between the indoor and outdoor units The indoor and outdoor units communicate via the RS485 serial port.

10

Build-out resistor

The communication wiring between the indoor and outdoor units should connect one unit after another in a daisy chain from the outdoor unit to the
final indoor unit, and the shielded layer must be properly grounded, and a build-out resistor must be added to the last indoor unit to enhance the stability of the communication system (see Figure 6.6). Incorrect wiring such as a star connection or a closed ring will cause instability of the communication system and system control anomalies. Use a three core shielded wire (greater than or equal to 0.75 mm2) for the communication wiring between the indoor and outdoor units. Make sure the wiring is connected correctly. The connecting lead for this communication wire must come from the master outdoor unit. All shielded wiring in the network are interconnected, and will eventually
connect to earth at the same point” “.

Outdoor unit

(Connect the shielded end of the shielded wire to the electronic controller box sheet metal ” ” here)

2. For a unidirectional communication mode: Use 1 wired controller to control 1 indoor unit (see Figure 6.9).

Indoor unit 1

A B C D
Display board
A B C D

P Q E
P Q E Communication line between indoor and outdoor units

Signalling line between outdoor units
Connecting the shielded layer of the shielded wire

Only the last indoor unit requires adding

P

the build-out resistor at P and Q.

Q (open)

Figure 6.6
6.3.2 Communication wiring between the indoor unit and wired controller
The wired controller and the indoor unit can be connected in different manners, depending on the forms of communication. 1) For a bidirectional communication mode: Use 1 wired controller to control 1 indoor unit or 2 wired controllers
(one master and one slave controller) to control 1 indoor unit (see Figure 6.7); Use 1 wired controller to control multiple indoor units or 2 wired controllers (one master and one slave controller) to control multiple indoor units (see Figure 6.8);

Wired controller 1

Figure 6.9
The X1/X2, D1/D2 ports on the sides of the main control board and the unidirectional communication port (display board side) are for different types of wired controllers (see Figure 6.10).
Use the connecting wires (accessory) to connect the D1/D2 ports.

To wired controller COMM. BUS
X1 X2

To outdoor/ indoor units COMM. BUS
E Q P

To wired controller COMM. BUS
D2 D1

X2 X1 E Q P

A B C D
Wired controller
XP4 XS4
Display board

Yellow Grey Black
White Blue

CN17

ON ON ON ON ON ON ON POWER_S
ON ON ON ON ON ON ON
12 12 12 12 12 12 12
SW6 SW5 SW4 SW3 SW2SW1 SW7 ENC1

CN9 CN15

Main control panel

Figure 6.10

P Q E X1 X2

Indoor unit 1

Caution
· For the specific connection method, refer to the instructions in the corresponding wired controller manual to carry out the wiring and connections.

X1 X2

Wired controller 1

Wired controller 2

Master wired controller

Slave wired controller

Figure 6.7

Indoor unit 1

Indoor unit 2

Indoor unit n(n<=16)

X1 X2

6.4 Handling the Electrical Wiring Connection Points
Once the wiring and connections are done, use tie straps to secure the wiring properly so that the connection joint cannot be pulled apart by external force. The connection wiring must be straight out so that the cover of the electrical box is level and can be closed tightly.
Use professional insulation and sealing materials to seal and protect the perforated wires. Poor sealing may lead to condensation, and entry of small animals and insects that may cause short circuits in parts of the electrical system, causing the system to fail.
6.5 Panel Wiring
Refer to the panel instructions to connect the docking terminals of the display board and the swing motor.

D2

D1

D1 D2

P Q E X1 X2

P Q E X1 X2

P Q E X1 X2

D1
X2 X1 D2 D1 D2

X2 X1 D2 D1

Wired controller 1 Master wired controller

Wired controller 2 Slave wired controller

Figure 6.8

11

7. On-site Configuration
7.1 Capacity Settings
Set up the PCB DIP switch on the indoor electric control box to cater to different uses. Once the settings are done, make sure you cut off the main power switch again, and then switch the power on. If the power is not cut off and switched on again, the settings will not be executed.
POWER_S

ENC1
ENC1 Settings for Capacity DIP Switch:
DIP Switch Code 0 1 2 3 4 5

Capacity 2200W 2800W 3600W 4500W 5600W 7100W

Caution
· The capacity DIP switches have been configured before delivery. Only a professional maintenance personnel should change these settings.

SW2

SW2

Factory settings

[ 00 ]

SW3_1

SW3

Reserved

[ 0]

SW3 [ 1] SW3_2

Clear indoor unit address

SW3 [ 0]

Reserved

SW4
SW4 [ 00 ] SW4 [ 01 ] SW4 [ 10 ] SW4 [ 11 ]

In heating mode when the set temperature has been reached, the fan operates in a 4 minutes off / 1 minute on repeating cycle
In heating mode when the set temperature has been reached, the fan operates in an 8 minutes off / 1 minute on repeating cycle
In heating mode when the set temperature has been reached, the fan operates in a 12 minutes off / 1 minute on repeating cycle
In heating mode when the set temperature has been reached, the fan operates in a 16 minutes off / 1 minute on repeating cycle

7.2 Address Settings
When this indoor unit is connected to the outdoor unit, the outdoor unit will automatically allocate the address to the indoor unit. Alternatively, you may use the controller to manually set the address. The addresses of any two indoor units in the same system cannot be the same. The network address and the indoor unit address are the same, and does
not have to be configured separately. Once the address settings are completed, mark the address of each indoor
unit to facilitate after-sales maintenance. The centralized control of the indoor unit is completed on the outdoor unit.
For details, refer to the manual on the outdoor unit.

SW5
SW5 [ 00 ] SW5 [ 01 ] SW5 [ 10 ] SW5 [ 11 ]

In heating mode fan does not run when indoor heat exchanger mid-point temperature is 15°C or below
In heating mode fan does not run when indoor heat exchanger mid-point temperature is 20°C or below
In heating mode fan does not run when indoor heat exchanger mid-point temperature is 24°C or below
In heating mode fan does not run when indoor heat exchanger mid-point temperature is 26°C or below

Caution
· Once the centralized control function for the indoor unit has been completed on the outdoor unit, the DIP switch on main control panel of the outdoor unit must be set to auto addressing; otherwise, the indoor unit in the system are not controlled by the centralized controller.
· The system can connect up to 64 indoor units (address 0~63) at the same time. Each indoor unit can only have one address DIP switch in the system. The addresses of any two indoor units in the same system cannot be the same. Units that have the same address may malfunction.

7.3 DIP Switch Settings on Main Board
0/1 definition of each dial code switch: means 0

means 1

SW6
SW6 [ 00 ]

Heating mode temperature compensation is 6°C

SW6 [ 01 ]

Heating mode temperature compensation is 2°C

SW6

Heating mode temperature compensation is 4°C

[ 10 ]

SW6

Heating mode temperature compensation is 0°C

[ 11 ]

(use follow me function)

SW7: reserved J1

SW1_1

SW1

Cooling mode temperature compensation is 0°C

[ 0]

Auto restart function enabled Auto restart function disabled

SW1 [ 1] SW1_2

Cooling mode temperature compensation is 2°C

SW1

EEV at position 96 (steps) in standby in heating mode

[ 0]

SW1

EEV at position 72 (steps) in standby in heating mode

[ 1]

Caution
· All DIP switches (including the capacity DIP switch) have been configured before delivery. Only a professional maintenance personnel should change these settings.
· Improper DIP switch settings may cause condensation, noise, or unexpected system malfunction.
12

7.4 Error Codes and Definitions

Operation manual

Error code Content

There are two types of precautions as described below: Warning: Failure to comply may lead to death or serious injury. Caution: Failure to comply may lead to injury or damage of the

E0 Mode conflict

unit. Depending on the situation, this may also lead to serious injury.

E1 Communication error between indoor and outdoor units
E2 Indoor ambient temperature sensor (T1) error E3 Indoor heat exchanger mid- point temperature sensor
(T2) error
E4 Indoor heat exchanger outlet temperature sensor (T2B) error
E6 Fan error

Once the installation is completed, please keep the manual properly for future reference. When this air conditioner is handed over to other users, make sure that the manual is included with the handover.
Warning · Do not use this unit in locations where flammable gas may exist. If
flammable gas comes into contact with the unit, a fire may occur, which could result in serious injury or death.

E7 EEPROM error

· If this unit exhibits any abnormal behavior (such as emitting

Eb Indoor EEV coil error Ed Outdoor unit error

smoke) there is a danger of serious injury. Disconnect the power supply and contact your supplier or service engineer immediately. · The refrigerant in this unit is safe and should not leak if the system

EE Water level error

is designed and installed properly. However, if a large amount of

FE Indoor unit has not been assigned an address

refrigerant leaks into a room, the oxygen concentration will decrease rapidly, which can cause serious injury or death. The

8. Test Run
8.1 Things to Note Before Test Run
Indoor and outdoor units are properly installed; Piping and wiring are correct; No leakage from the refrigerant piping system; Water discharge is smooth; Insulation is complete; Grounding line has been properly connected; Piping length, and amount of refrigerant filled have been recorded; The voltage of the power supply is the same as the rated voltage

refrigerant used in this unit is heavier than air, so the danger is greater in basements or other underground spaces. In the event of a refrigerant leak, turn off any devices that produce a naked flame and any heating devices, ventilate the room, and contact your supplier or service engineer immediately. · Toxic fumes may be produced if the refrigerant in this unit comes into contact with naked flames (such as from a heater, gas stove/burners, or electric appliances). · If this unit is used in the same room as a cooker, stove, hob, or burner, ventilation for sufficient fresh air must be ensured, otherwise the oxygen concentration will fall, which may cause

of the air conditioner; No obstacles at the air inlet and outlet of the indoor and outdoor
units; Cut-off valves for the gas and liquid ends of the outdoor unit are

injury. · Dispose of this unit’s packaging carefully, so children cannot play
with it. Packaging, especially plastic packaging, can be dangerous, can cause serious injury or death. Screws, staples

opened;

and other metal packaging components can be sharp and should

8.2. Test Run
When the wired/remote controller is used to set the cooling operations of the air conditioner, check the following items one by one. If there is a fault, troubleshoot according to the manual.

be disposed of carefully to avoid injury. · Do not attempt to inspect or repair this unit yourself. This unit
should only be serviced and maintained by a professional air conditioning service engineer. Incorrect servicing or maintenance can cause electric shocks, fire or water leaks.

Function keys of the wired/remote controller are operating

· This unit should only be re-positioned or re-installed by a

normally;

professional technician. Incorrect installation can lead to electric

Room temperature regulation is normal;

shocks, fire or water leaks. The installation and grounding of

LED indicator is on;

electrical appliances should only be carried out by licensed

Water discharge is normal;

professionals. Ask your supplier or installation engineer for further

No vibration and strange sounds during operation;

information.

Note: Once the power is connected, when the unit is turned on or started immediately after the unit is turned off, the air conditioner has a protective function which delays the start of the compressor.

· Do not allow this unit or its remote controller to come into contact with water, as this can lead to electric shocks or fire.
· Turn off the unit before cleaning it to avoid electric shocks. Otherwise, an electric shock and injury may result.

· To avoid electric shocks and fires, install an earth leakage detector.

· Do not use paint, varnish, hair spray, other flammable sprays or

other liquids that may give off flammable fumes/vapor near this

unit, as doing so can cause fires.

· When replacing a fuse, ensure that the new fuse to be installed

completely complies with requirements.

· Do not open or remove the unit’s panel when the unit is powered

on. Touching the unit’s internal components while the unit is

powered on can lead to electric shocks or injuries caused by

moving parts such as the unit’s fan.

· Ensure that the power supply is disconnected before any servicing
13 or maintenance is carried out.

· Do not touch the unit or its remote controller with wet hands, as doing so can lead to electric shocks.
· Do not allow children to play near this unit, as doing so risks injury. · Do not insert your fingers or other objects into the unit’s air inlet or
air outlet to avoid injury or damage to the equipment. · Do not spray any liquids onto the unit or allow any liquids to drip
onto the unit. · Do not place vases or other liquid containers on the unit or in
places where liquid could drip onto it. Water or other liquids that come into contact with the unit can lead to electric shocks or fires. · Do not remove the remote controller’s front or back overs and do not touch the remote controller’s internal components, as doing so can cause injury. If the remote controller stops working, contact your supplier or service engineer. · Ensure that the unit is properly grounded, otherwise electric shocks or a fire may result. Electrical surges (such as those that can be caused by lightning) can damage electrical equipment. Ensure that suitable surge protectors and circuit breakers are properly installed, otherwise electric shocks or a fire may result. · Dispose of this unit properly and in accordance with regulations. If electrical appliances are disposed of in landfills or dumps, hazardous substances can leak into the groundwater and thus enter the food chain. · Do not use the unit until the qualified technician instructs you that it is safe to do so. · Do not place appliances that produce naked flames in the path of the airflow from the unit. The airflow from the unit may increase the rate of combustion, which may cause a fire and cause serious injury or death. Alternatively, the airflow may cause incomplete combustion which can lead to reduced oxygen concentration in the room, which can cause serious injury or death.

· To avoid damaging the remote controller, exercise caution when using it and replacing its batteries. Do not place objects on top of it.
· Do not place appliances that have naked flames under or near the unit, as heat from the appliance can damage the unit.
· Do not place the unit’s remote controller in direct sunlight. Direct sunlight can damage the remote controller’s display.
· Do not use strong chemical cleaners to clean the unit, as doing so can damage the unit’s display or other surfaces. If the unit is dirty
or dusty, use a slightly damp cloth with very diluted and mild
detergent to wipe the unit. Then, dry it with a dry cloth. · Children shall not play with the appliance.
· Do not dispose of this product as unsorted waste. It must be separately collected and processed. Ensure that all applicable legislation regarding the disposal of refrigerant, oil and other materials is adhered to. Contact your local waste disposal authority for information about disposal procedures.

· 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.

9. Part Names

The figure shown above is for reference only and may be slightly different from the actual product.

Caution

· Only use the air conditioner for its intended purpose. This unit

should not be used to provide refrigeration or cooling for food,

plants, animals, machinery, equipment or art.

· Do not insert your fingers or other objects into the unit’s air inlet or

air outlet to avoid injury or damage to the equipment.

· The fins on the unit’s heat exchanger are sharp and can cause

injury if touched. To prevent injury, when the unit is being serviced,

gloves should be worn or the heat exchanger should be covered.

· Do not place items which might be damaged by moisture under

the unit. When the humidity is greater than 80% or if the drain pipe

is blocked or the air filter is dirty, water could drip from the unit and

damage objects placed under the unit.

· Ensure that the drain pipe functions properly. If the drain pipe is

blocked by dirt or dust, water leaks may occur when the unit is

running in cooling mode. If this happens, turn the unit off and

contact your supplier or service engineer.

· Do not touch the internal parts of the controller. Do not remove the

front panel. Some internal parts may cause injury or be damaged.

· Ensure that children, plants and animals are not directly exposed

to the airflow from the unit.

· When fumigating a room with insecticide or other chemicals, cover

the unit well and do not run it. Failure to observe this caution could

lead to chemicals getting deposited inside the unit and later

emitted from the unit when it running, endangering the health of

any room occupants.

· Do not dispose of this product as unsortedwaste. It must be

separately collectedand processed. Ensure that allapplicable

legislation regarding thedisposal of refrigerant, oil and

othermaterials is adhered to. Contact your local waste disposal

authority forinformation about disposal procedures.

14

Air Outlet Louver (adjustable) For in-situ adjustment to three-direction or two-direction,please contact the local dealer.
Air inlet grille
Figure 9.1

10. The Explain Of The Display Panel

Digital LED display Infrared signal receiver

Check Operation Timer Anti-cold air /

ALARM

button indicator indicator defrosting indicator

Table: Display panel output under normal operating conditions.

Unit state Standby

Unit state
Operation indicator flashes slowly

Display output Digital display panels
Digital display

Shutting-down

All indicators off

Operation

Normal operation

Operation indicator Cooling and heating modes: set temperature

on

Fan only mode: indoor ambient temperature

Cold draft prevention Operation and

or outdoor unit

Anti-cold / defrosting

defrosting operation indicators on

Set temperature

A timer has been set

Timer indicator on

Note: Flashing slowly means flashing once per second.

11. Air Conditioner Operations and Performance

The operating temperature range under which the unit runs stablyare

given in below table.

Cooling mode

Heating mode

Indoor temperature

17j32°C(DB)

15j27°C(DB)

Indoor humidity

80%(a)

(a) Condensation will form on the unit surface and water dripping out of the unit when the indoor humidity is beyond 80%

Caution
· The unit performs stably in the temperature range given in above table. If the indoor temperature is outside the unit’s normal operating range, it may stop running and display an error code.
To ensure the desired temperature is achievedefficiently, ensure that: All windows and door are closed. The airflow direction is adjusted to work in running mode.
The air filter is clean. Please note how you can best save energy and achieve the best cooling/heating effect. Regularly clean air filters inside indoor units.

15

Check regularly
Figure 11.1 Avoid too much outdoor air coming into air-conditioned spaces.
Close doors and windows.

Caution · During heating operation, horizontal airflow will aggravate the
uneven distribution of room temperature. · The louver direction: horizontal airflow is recommended
during cooling operation. Note the downward air flow will cause condensation on the air outlet and louver surface.
Adjust the air direction up and down a. Auto-swing: Press SWING for the louver to swing up and down. b. Manual swing: Adjust the louver to improve the cooling or heating effect. c. When cooling adjust the louver horizontally.

Figure 11.2
Note that outlet air is cooler or heater than set room temperature. Avoid direct exposure to outlet air as it may be too cool or hot.

Figure 12.1 d. When heating adjust the louver downward.

Do not set the temperature too
low
Figure 11.3 Maintain a proper air distribution.Air outlet louvers should be used
to adjust the direction of outlet airflow, as doing so might ensure more efficient operation.

13. Maintenance

Figure 12.2

Caution
· Please release pressure before disassembly. · Before you clean the air conditioner, ensure it is powered off. · Check that the wiring is undamaged and connected. · Use a dry cloth to wipe the indoor unit and remote controller. · A wet cloth may be used to clean the indoor unit if it is very
dirty. · Never use a damp cloth on the remote controller. · Do not use a chemically treated duster on the unit or leave this
type of material on the unit to avoid damaging the finish. · Do not use benzene, thinner, polishing powder, or similar
solvents for cleaning. These may cause the plastic surface to crack or warp.

Figure 11.4
12. Adjusting Air Flow Direction
Since warmer air rises and cooler air falls, the distribution of warmed/cooled air around a room can be improved by positioning the unit’s louvers. The louver angle can be adjusted by pressing the [SWING] button on the remote controller.

Method for cleaning the air filter a. The air filter can prevent the dust or other particles from entering the unit. If the filter is blocked, the unit will not work well. Clean the filter every two weeks when you use it regularly. b. If the air conditioner is positioned in a dusty place, clean the filter often. c. Replace the filter if it is too dusty to clean (the replaceable air filter is an optional fitting).
1. Take out the air intake grille Push the grille switches simultaneously. Then pull down the air
intake grille (together with the air). Pull the air intake grille down to 45°, and lift it up to remove the grille.
Caution
· The control box cables originally connected to the electrical terminals on the main body must be removed, as indicated above.

16

2. Dismantle the air filter. 3. Clean the air filter Dusts will accumulate on the filter along with the unit operation,
and need to be removed from the filter,or the unit would not function effectively. Clean the filter every two weeks when you use the unit regularly. Clean the air filter with a vacuum cleaner or water. a. The air intake side should face up when using a vacuum
cleaner. (Refer to Figure 13.1) b. The air intake side should face down when using clean water.
(Refer to Figure 13.2) For excessive dusts, use a soft brush and natural detergent to
clean it and dry in a cool place.
Figure 13.1
Figure 13.2
Caution · Do not dry out the air filter under direct sunshine or with fire. · The air filter should be installed before the unit body installation.
4. Re-install the air filter. 5. Install and close the air inlet grille by reversing steps 1 and 2, and
connect the control box cables to the corresponding terminals in the main body. Maintenance before stopping using the unit for a long time (e.g., at the end of a season) a. Let the indoor units run in fan only mode for about half a day to
dry the interior of the unit. b. Clean the air filter and indoor unit casing. c. Refer to “Cleaning the air filter” for details. Install cleaned air
filters back in their original positions. d. Turn off the unit with the ON/OFF button on the remote
controller, and then unplug it.
Caution · When the power switch is connected, some energy will be
consumed even if the unit is not running. Disconnect the power to save energy. · A degree of dirt will accumulate when the unit has been used several times, which will require cleaning. · Take of the batteries from the remote controller.

Maintenance after a long period of non-use a. Check for and remove anything that might be blocking the inlet and outlet vents of the indoor units and outdoor units. b. Clean the unit casing and clean the filter. Refer to [Cleaning the filter] and “Cleaning the filter” for instructions. Re-install the filter before running the unit. c. Turn on the power at least 12 hours before you want to use the unit to ensure it works properly. As soon as the power is turned on, the remote control display appears.
14. Symptoms That Are Not Faults
The following symptoms may be experienced during the normal operation of the unit and are not considered faults. Note: If you are not sure whether a fault has occurred, contact your supplier or service engineer immediately.
Symptom 1: The unit will not run Symptom: When the ON/OFF button on the remote controller is
pressed, the unit does not immediately start running. Cause: to protect certain system components, system start-up or re-start is intentionally delayed for up to 12 minutes under some operating conditions. If the OPERATION LED on the unit’s panel is lighting, the system is working normally and the unit will start after the intentional delay is complete.
Heating mode is running when the following panel lights are on:operation and the “DEF./FAN LED indicator. Cause: the indoor unitactivates protective measures because of the low outlettemperature.
Symptom 2: The unit emits white mist White mist is generated and emitted when the unit starts to
operate in a very humid environment. This phenomenon will stop once the humidity in the room is reduced to normal levels. The unit occasionally emits white mist when it runs in heating mode. This occurs when the system finishes periodic defrosting. Moisture that may accumulate on the unit’s heat exchanger coil during defrosting becomes mist and is emitted from the unit.
Symptom 4: Dust is emitted from the unit This can occur when the unit first runs after a long idle period.
Symptom 5: The unit gives off a strange odor If smells such as those of strong-smelling food or tobacco smoke are
present in the room, they can enter the unit, leave trace deposits on the unit’s internal components, and later be emitted from the unit.
15. Troubleshooting
15.1 General Sections 14.2 and 14.3 describe some initial troubleshooting steps that
can be taken when an error occurs. If these steps do not resolve the issue, arrange for a professional technician to investigate the problem. Do not attempt further investigations or troubleshooting yourself. If any of the following errors occur, power the unit off, contact a professional technician immediately and do not attempt troubleshooting yourself: a. A safety device such as a fuse or circuit breaker frequently
blows/trips. b. An object or water enters the unit. c. Water is leaking from the unit.
Caution · Do not attempt to inspect or repair this unit by yourself. Arrange for
a qualified technician to carry out all servicing and maintenance.

17

15.2 Unit Troubleshooting

Symptom

Possible causes

Troubleshooting steps

A power cut has occurred (the power to the

premises has been cut-off).

Wait for the power to come back on.

The unit does not start

The unit is powered off.

Power on the unit. This indoor unit forms part of an air conditioning system that has multiple indoor units that are all connected. The indoor units cannot be powered on individually – they are all connected to one, single power switch. Ask a professional technician for advice regarding how to safely power on the units.

Air flows normally butdoesn’t cool The unit starts or stopsfrequently
Low cooling effect

The power switch fuse may haveburned out. The remote controller’s batteries aredead.

Replace the fuse. Replace the batteries.

The temperature setting is not correct.

Set the desired temperature on theremote controller.

Arrange for a professional technician to check the following: Too much or too little refrigerant. No gas in the refrigerant circuit. The outdoor unit comp ressors have malfunctioned.

The power supply voltage is too high or too low.

There is a blockage in the piping system.

Doors or windows are open.

Close the doors and windows.

Sunlight is shining directly onto theunit.

Close shutters/blinds to shield the unitfrom direct sunlight.

The room contains many heat sourcessuch as Turn off some of the computers duringthe hottest part

computers or refrigerators.

of the day.

The unit’s air filter is dirty.

Clean the filter.

The outside temperature is unusuallyhigh.

The cooling capacity of the system reduces as the outdoor temperature rises and the system may not provide sufficient cooling if the local climate conditions are not considered when the system’s outdoor units were selected.

Low heating effect

Engage a professional air conditioning engineer to check the following: The unit’s heat exchanger is dirty. The unit’s air inlet or outlet is blocked. A refrigerant leak has occurred.

Doors or windows are not completelyclosed.

Close doors and windows.

Arrange for a professional technician to check the following:

A refrigerant leak has occurred.

18

15.3 Remote Controller Troubleshooting
Warning:
Certain troubleshooting steps that a professional technician may perform when investigating an error are described in this owner’s manual for reference only. Do not attempt to undertake these steps yourself ­ arrange for a professional technician to investigate the problem.
If any of the following errors occur, power the unit off and contact a professional technician immediately. Do not attempt troubleshooting yourself: A safety device such as a fuse or circuit breaker frequently blows/trips. An object or water enters the unit. Water is leaking from the unit.

Symptom

Possible causes

Troubleshooting steps

Check whether the MODEindicated on the display is “AUTO”.

In automatic mode, the air conditioner will automatically change the fan’sspeed.

The fan speed cannot beadjusted

Check whether the MODEindicated on the display is “DRY”.

When dry mode is selected, theair conditioner automatically adjuststhe fan speed. (The fan speed can beselected during “COOL”, “FAN ONLY”,and “HEAT”.)

The remote controller signalis not transmitted even whenthe ON/OFF button is pushed

A power cut has occurred (the powerto the premises has been cut-off).
The remote controller’s batteries are

Wait for the power to come back on. Replace the batteries.

The indication on the displaydisappears after a certain time

Check whether the timer operation has come to an end when TIMER OFF is indicated on the display.

The air conditioner operation will stopup to the set time.

The TIMER ON indicator goesoff after a certain time

Check whether the timer operation has come to an end when TIMER ON is indicated on the display.

Up to the set time, the airconditioner will automatically startand the appropriate indicator will gooff.

No receiving soundfrom the indoor unit whenthe ON/OFF button is pressed

Check whether the signal transmitterof the remote controller is properlydirected to the infrared signal receiverof the indoor unit when the ON/OFFbutton is pressed.

Directly transmit the signal transmitterof the remote controller to the infraredsignal receiver of the indoor unit, andthen press the ON/OFF button twice.

19

15.4 Error Codes
With the exception of a mode conflict error, contact your supplier or service engineer if any of the error codes listed in the following table are displayed on the unit’s display panel. If the mode conflict error is displayed and persists, contact your supplier or service engineer. These errors should only be investigated by a professional technician. The descriptions are provided in this manual for reference only.

Content

Digital display output

Possible causes

Mode conflict

E0

Communication error

betweenindoor and

E1

outdoor units

Indoor ambient temperature

sensor (T1) error

E2

Indoor heat exchanger

mid-point temperature

E3

sensor (T2) error

Indoor heat exchanger

outlet temperature sensor

E4

(T2B) error

Fan error

E6

EEPROM error

E7

Indoor EEV coil error

Eb

Outdoor unit error

Ed

Water level error

EE

indoor unit has not

been assigned an

FE

address

The indoor unit’s operating mode conflicts with that of the outdoor units.
Communication wires betweenindoor and outdoor units not connected properly.
Interference from high voltage wires or other sources of electromagnetic radiation.
Communication wire too long. Damaged main PCB.
Temperature sensor not connected properly or has malfunctioned. Damaged main PCB.
Fan stuck or blocked. Fan motor not connected properlyor has malfunctioned. Power supply abnormal. Damaged main PCB.
Damaged main PCB.
Line loosened or broken. The electronic expansion valve in stuck. Damaged main PCB. Outdoor unit error. Water level float stuck. Water level switch not connected properly. Damaged main PCB. Drain pump has malfunctioned.
Indoor unit has not been assigned an address.

Notes: Flashing rapidly means flashing twice per second; flashing slowly means flashing once per second.

20

16126000002968 V.N

80g 210*297() /

)

2021.01.04 80

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