Century B-VMH24CU-1 Super Slim Four Way Cassette Instruction Manual

Century B-VMH24CU-1 Super Slim Four Way Cassette

Product Information

The Super-Slim Four-Way Cassette Model B-VMH24CU-1 is an air conditioning system designed for installation in both residential and commercial settings. It consists of an indoor unit and an outdoor unit that work together to provide efficient cooling and heating.

Accessories

• Indoor unit
• Installation paper template
• Refrigeration soundproof/insulation sheath
• Outlet pipe sheath
• Outlet pipe clasp
• Drainpipe
• Drain joint
• Seal ring
• Ceiling hook
• Suspension bolt
• Orifice tube
• EMC Magnetic Ring
• Remote controller
• S1 & S2 (P & Q & E)
• Fixing screw for remote controller holder ST2.9 x 10
• Remote controller & its frame
• Dry battery AAA
• Remote controller illustration
• Owner’s manual
• Installation manual

Safety Precautions

It is important to read and follow the safety precautions before installing the air conditioning system. Incorrect installation can lead to serious damage or injury. The potential risks are classified as either a WARNING or CAUTION.

Product Usage Instructions

1. Before installation, carefully review the installation manual and ensure that you have all the necessary accessories.
2. Follow the step-by-step instructions in the installation manual for the indoor unit installation. This includes assembling the indoor unit parts and following the provided instructions for installation.
3. Proceed with the outdoor unit installation by following the instructions provided in the installation manual. Pay special attention to the drain joint installation and notes on drilling holes in the wall.
4. Install the drainpipe according to the instructions provided.
5. Connect the refrigerant piping by following the guidelines for pipe length and elevation. Refer to the refrigerant piping connection instructions for detailed guidance.
6. Complete the wiring process, including outdoor unit wiring,indoor unit wiring, and ensuring proper power specifications are met.
7. Perform air evacuation as instructed in the manual. Take note of the caution regarding the risk of fire for R32/R290 refrigerant.
8. Install the panel according to the provided instructions.
9. Conduct a test run to ensure proper functioning of the air conditioning system.

Note: It is crucial to follow all safety precautions and instructions provided in the installation manual to avoid any potential risks or damage during installation.

Accessories

The air conditioning system comes with the following accessories. Use all of the installation parts and accessories to install the air conditioner. Improper installation may result in water leakage, electrical shock and fire, or cause the equipment to fail.

Name Shape Quantity

Indoor unit installation| Installation paper template (some models)| |

1

Refrigeration Fittings| Soundproof/insulation sheath (some models)| |

1

Drainpipe Fittings

| Outlet pipe sheath (some models)| |

1

Outlet pipe clasp (some models)

| |

1

Drain joint (some models)| |

1

Seal ring (some models)| | 1

Installation Accessory (some models)

|

Ceiling hook

| |

4

Suspension bolt| | 4
Orifice tube (some units)| | 1

EMC Magnetic Ring (some models)

| Magnetic ring (wrap the electric wires S1 & S2

( P & Q & E ) around

the magnetic ring twice)

|

|

1

Magnetic ring (Hitch it on the connective cable between indoor unit and outdoor unit after

installation.)

| |

1

Remote controller & Its Frame (some models)

| Remote controller| | 1
Fixing screw for remote controller holder ST2.9 x 10| | 2

Remote controller holder

| | 1
Dry battery AAA| | 2
Remote controller illustration| ——| 1
others| Owner’s manual| ——| 1
Installation manual| ——| 1

Safety Precautions

Read Safety Precautions Before Installation
Incorrect installation due to ignoring instructions can cause serious damage or injury. The seriousness of potential damage or injuries is classified as either a WARNING or CAUTION.

WARNING
Failure to observe a warning may result in death. The appliance must be installed in accordance with national regulations.
CAUTION
Failure to observe a caution may result in injury or equipment damage.

WARNING

• Carefully read the Safety Precautions before installation.

• In certain functional environments, such as kitchens, server rooms, etc., the use of specially designed air-conditioning units is highly recommended.

• Only trained and certified technicians should install, repair and service this air conditioning unit.
  Improper installation may result in electrical shock, short circuit, leaks, fire or other damage to the equipment and personal property.

• Strictly follow the installation instructions set forth in this manual.
  Improper installation may result in electrical shock, short circuit, leaks, fire or other damage to the equipment.

• An all-pole disconnection device which has at least 3mm clearances in all poles, and has a leakage current that may exceed 10mA, the residual current device (RCD) having a rated residual operating current not exceeding 30mA, and disconnection must be incorporated in the fixed wiring in accordance with the wiring rules.

• Before you install the unit, consider strong winds, typhoons and earthquakes that might affect your unit and locate it accordingly. Failure to do so could cause the equipment to fail.

• After installation, ensure there are no refrigerant leaks and that the unit is operating properly. Refrigerant is both toxic and flammable and poses a serious health and safety risk.

• This appliance can be used by children age 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.

• Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer.

• The appliance shall be stored so as to prevent mechanical damage from occurring.

WARNING

• The appliance disconnection must be incorporated with an all-pole disconnection device with the fixed wiring in accordance with the wiring rules.
• Any person who is involved with working on or breaking into a refrigerant circuit should hold a current valid certificate from an industry-accredited assessment authority, which authorizes their competence to handle refrigerants safely in accordance with an industry recognized assessment specification.
• Servicing shall only be performed as recommended by the equipment manufacturer. Maintenance and repair requiring the assistance of other skilled personnel shall be carried out under the supervision of the person competent in the use of flammable refrigerants.
• The appliance shall be stored so as to prevent mechanical damage from occurring.
• Keep ventilation openings clear of obstruction.

Model (Btu/h)| Amount of refrigerant to be charged (kg)| maximum installation height (m)| Minimum room area (m²)
---|---|---|---
≤30000| ≤2.048| (4.52 lbs)| 2.2m| (7.22 ft)| 4| (43 ft2)
30000-48000| 2.048-3.0| (4.52-6.61 lbs)| 2.2m| (7.22 ft)| 4| (43 ft2)

Note about Fluorinated Gasses

1. This air-conditioning unit contains fluorinated gasses. For specific information on the type of gas and the amount, please refer to the relevant label on the unit itself.
2. Installation, service, maintenance and repair of this unit must be performed by a certified technician.
3. Product uninstallation and recycling must be performed by a certified technician.
4. If the system has a leak-detection system installed, it must be checked for leaks at least every 12 months.
5. When the unit is checked for leaks, proper record-keeping of all checks is strongly recommended.

Explanation of symbols displayed on the indoor unit or outdoor unia (applicable to the unit adopts R32/R290 Refrigerant only):

|

WARNING

| This symbol shows that this appliance uses a flammable refrigerant. If the refrigerant is leaked and exposed to an external ignition source, there is a risk of fire.
---|---|---
**| CAUTION| This symbol shows that the operation manual should be read carefully.
| CAUTION| This symbol shows that service personnel should be handling this equipment with reference to the installation manual.
**| CAUTION
| CAUTION| This symbol shows that information is available such as the operating manual or installation manual.

Installation Overview

INSTALLATION ORDER

Indoor Unit Installation

Indoor Unit Parts

Safety Precautions

WARNING

• Securely install the indoor unit on a structure that can sustain its weight. If the structure is too weak, the unit may fall and cause personal injury, unit and property damage, or death.
• Install the indoor unit at a height of more than 2.5m (8’) above the floor.
• DO NOT install the indoor unit in a bathroom or laundry room as excessive moisture can short the unit and corrode the wiring.

CAUTION

• Install the indoor and outdoor units, cables, and wires at least 1m (3.2’) from televisions and radios to prevent static or image distortion. Depending on the appliances, a 1m (3.2’) distance may not be sufficient.
• If the indoor unit is installed on metal,
  it must be electrically grounded.

Indoor Unit Installation Instructions

NOTE: Panel installation should be done after piping and wiring.

Step 1: Select installation location

The indoor unit should be installed in a location that meets the following requirements:

• The unit is at least 1m (39”) from the nearest wall.
• There is enough room for installation and maintenance.
• There is enough room for the connecting pipe and drainpipe.
• The ceiling is horizontal and its structure can sustain the weight of the indoor unit.
• The air inlet and outlet are not impeded.
• The airflow can fill the entire room.
• There is no direct radiation from heaters.

CAUTION

DO NOT install the unit in the following locations:

• In areas with oil drilling or fracking
• In coastal areas with high salt content in the air
• In areas with caustic gases in the air, such as near hot springs
• In areas with power fluctuations, such as factories
• In enclosed spaces, such as cabinets
• In kitchens that use natural gas
• In areas with strong electromagnetic waves
• In areas that store flammable materials or gas
• In rooms with high humidity, such as bathrooms or laundry rooms

RECOMMENDED DISTANCES BETWEEN THE INDOOR UNIT AND THE CEILING
The distance between the mounted indoor unit and the internal ceiling should meet the following specifications. (See Fig. 4.2)

Table 4.1: Distance from ceiling relative to height of indoor unit

Step 2: Hang indoor unit.

1. Use the included paper template to cut a rectangular hole in the ceiling, leaving at least 1m (39”) on all sides. The cut hole size should be 4cm(1.6”) larger than the body size(See Fig. 4.3). Be sure to mark the areas where ceiling hook holes will be drilled. CAUTION
   The unit body should align perfectly with the hole. Ensure that the unit and the hole are the same size before moving on.

2. Drill 4 holes 5cm (2”) deep at the ceiling hook positions in the internal ceiling. Be sure to hold the drill at a 90° angle to the ceiling.

3. Using a hammer, insert the ceiling hooks into the pre-drilled holes. Secure the bolt using the included washers and nuts.

4. Install the four suspension bolts (See Fig. 4.4).

5. Mount the indoor unit. You will need two people to lift and secure it. Insert suspension bolts into the unit’s hanging holes. Fasten them using the included washers and nuts (See Fig. 4.5). NOTE: The bottom of the unit should be 10 – 18mm (0.4-0.7”) higher than the ceiling board. Generally, L (indicated in Fig. 4.6) should be half the length of the suspension bolt or long enough to prevent the nuts from coming off. CAUTION
   Ensure that the unit is completely level. Improper installation can cause the drain pipe to back up into the unit or water leakage.
   NOTE:
   Ensure that the indoor unit is level. The unit is equipped with a built-in drain pump and float switch. If the unit is tilted against the direction of condensate flows (the drainpipe side is raised), the float switch may malfunction and cause water to leak. NOTE FOR NEW HOME INSTALLATION
   When installing the unit in a new home, the ceiling hooks can be embedded in advance. Make sure that the hooks do not come loose due to concrete shrinkage. After installing the indoor unit, fasten the installation paper template onto the unit with bolts (M6X12) to determine in advance the dimension and position of the opening on the ceiling. Follow the instructions above for the remainder of the installation.

Outdoor Unit Installation

Outdoor Unit Installation Instructions

Step 1: Select installation location.
The outdoor unit should be installed in the location that meets the following requirements:

• Place the outdoor unit as close to the indoor unit as possible.

• Ensure that there is enough room for installation and maintenance.

• The air inlet and outlet must not be obstructed or exposed to strong wind.

• Ensure the location of the unit will not be subject to snowdrifts, accumulation of leaves or other seasonal debris. If possible, provide an awning for the unit. Ensure the awning does not obstruct airflow.

• The installation area must be dry and well ventilated.

• There must be enough room to install the connecting pipes and cables and to access them for maintenance. Step 2: Install outdoor unit.
  Fix the outdoor unit with anchor bolts (M10)

• The area must be free of combustible gases and chemicals.

• The pipe length between the outdoor and indoor unit may not exceed the maximum allowable pipe length.

• If possible, DO NOT install the unit where it is exposed to direct sunlight.

• If possible, make sure the unit is located far away from your neighbors’ property so that the noise from the unit will not disturb them.

• If the location is exposed to strong winds (for example: near a seaside), the unit must be placed against the wall to shelter it from the wind. If necessary, use an awning. (See Fig. 5.1 & 5.2)

• Install the indoor and outdoor units, cables and wires at least 1 meter from televisions or radios to prevent static or image distortion. Depending on the radio waves, a 1 meter distance may not be enough to eliminate all interference.

CAUTION

• Be sure to remove any obstacles that may block air circulation.
• Make sure you refer to Length Specifications to ensure there is enough room for installation and maintenance.

Split Type Outdoor Unit
(Refer to Fig 5.4, 5.5, 5.6, 5.10 and Table 5.1)

Table 5.1: Length Specifications of Split Type Outdoor Unit (unit: mm/inch)

Outdoor Unit Dimensions

W x H x D

| Mounting Dimensions

Distance A      Distance B

---|---
760x590x285 (29.9×23.2×11.2)| 530 (20.85)| 290 (11.4)
810x558x310 (31.9x22x12.2)| 549 (21.6)| 325 (12.8)
845x700x320 (33.27×27.5×12.6)| 560 (22)| 335 (13.2)
900x860x315 (35.4×33.85×12.4)| 590 (23.2)| 333 (13.1)
945x810x395 (37.2×31.9×15.55)| 640 (25.2)| 405 (15.95)
990x965x345 (38.98x38x13.58)| 624 (24.58)| 366 (14.4)
938x1369x392 (36.93×53.9×15.43)| 634 (24.96)| 404 (15.9)
900x1170x350 (35.4x46x13.8)| 590 (23.2)| 378 (14.88)
800x554x333 (31.5×21.8×13.1)| 514 (20.24)| 340 (13.39)
845x702x363 (33.27×27.6×14.3)| 540 (21.26)| 350 (13.8)
946x810x420 (37.24×31.9×16.53)| 673 (26.5)| 403 (15.87)
946x810x410 (37.24×31.9×16.14)| 673 (26.5)| 403 (15.87)
952x1333x410 (37.5×52.5×16.14)| 634 (24.96)| 404 (15.9)
952x1333x415 (37.5×52.5×16.34)| 634 (24.96)| 404 (15.9)

Vertical Discharge Type Outdoor Unit

(Refer to Fig 5.7, 5.8, 5.9 and Table 5.2) Table 5.2: Length Specifications of Vertical Discharge Outdoor Unit (unit: mm/inch)

MODEL

| DIMENSIONS

W H                      D

---|---
18| 554/21.8| 633/25| 554/21.8
24| 554/21.8| 633/25| 554/21.8
36| 554/21.8| 759/29.8| 554/21.8
36| 600/23.6| 633/25| 600/23.6
48| 710/28| 759/29.8| 710/28
60| 710/28| 843/33| 710/28

NOTE: The minimum distance between the outdoor unit and walls described in the installation guide does not apply to airtight rooms. Be sure to keep the unit unobstructed in at least two of the three directions (B, C, D) (See Fig. 5.10)

A| 4” Clearance (Min. allowed) 1%-2% efficiency and capacity Loss 5” Clearance with no efficiency or capacity loss
---|---
B| 12” on right
C| 79” in front
D| 12” on left
E| 24” above

Rows of series installation

Table 5.3 The relations between H, A and L are as follows.

Drain Joint Installation

If the drain joint comes with a rubber seal (see Fig. 5.12 – A ), do the following:

1. Fit the rubber seal on the end of the drain joint that will connect to the outdoor unit.
2. Insert the drain joint into the hole in the base pan of the unit.
3. Rotate the drain joint 90° until it clicks in place facing the front of the unit.
4. Connect a drain hose extension (not included) to the drain joint to redirect water from the unit during heating mode.

If the drain joint doesn’t come with a rubber seal (see Fig. 5.12 – B ), do the following:

1. Insert the drain joint into the hole in the base pan of the unit. The drain joint will click in place.
2. Connect a drain hose extension (not included) to the drain joint to redirect water from the unit during heating mode.
   NOTE: Make sure the water drains to a safe location where it will not cause water damage or a slipping hazard.

Notes On Drilling Hole In Wall
You must drill a hole in the wall for the refrigerant piping, and the signal cable that will connect the indoor and outdoor units.

1. Determine the location of the wall hole based on the location of the outdoor unit.

2. Using a 65-mm (2.5”) core drill, drill a hole in the wall.
   NOTE: When drilling the wall hole, make sure to avoid wires, plumbing, and other sensitive components.

3. Place the protective wall cuff in the hole.
   This protects the edges of the hole and will help seal it when you finish the installation process.

Drainpipe Installation

The drainpipe is used to drain water from the unit. Improper installation may cause unit and property damage.

CAUTION

• Insulate all piping to prevent condensation, which could lead to water damage.
• If the drainpipe is bent or installed incorrectly, water may leak and cause a malfunction of the water- level switch.
• In HEAT mode, the outdoor unit will discharge water. Ensure that the drain hose is placed in an appropriate area to avoid water damage and slippage due to frozen drain water.
• DO NOT pull the drainpipe forcefully as this could cause it to disconnect.

NOTE ON PURCHASING PIPES
This installation requires a polyethylene tube (outside diameter = 3.7-3.9cm, inside diameter = 3.2cm), which can be obtained at your local hardware store or from your dealer.

Indoor Drainpipe Installation
Install the drainpipe as shown in Figure 6.2.

1. Cover the drainpipe with heat insulation to prevent condensation and leakage.
2. Attach the mouth of the drain hose to the unit’s outlet pipe. Sheath the mouth of the hose and clip it firmly with a pipe clasp. (Fig 6.1) NOTE ON DRAINPIPE INSTALLATION
   • When using an extended drainpipe, tighten the indoor connection with an additional protection tube to prevent it from pulling loose.
   • The drainpipe should slope downward at a gradient of at least 1/100 to prevent water from flowing back into the air conditioner.
   • To prevent the pipe from sagging, space hanging wires every 1-1.5m (40-59”).
   • If the outlet of the drainpipe is higher than the body’s pump joint, provide a lift pipe for the exhaust outlet of the indoor unit. The lift pipe must be installed no higher than 75cm (29.5”) from the ceiling board and the distance between the unit and the lift pipe must be less than 30cm (11.8”). Incorrect installation could cause water to flow back into the unit and flood.
   • To prevent air bubbles, keep the drain hose level or slightly tilted up (<75mm / 3”). NOTE: When connecting multiple drainpipes, install the pipes as shown in Fig 6.4.
3. Using a 65-mm (2.5”) core drill, drill a hole in the wall. Make sure that the hole is drilled at a slight downward angle, so that the outdoor end of the hole is lower than the indoor end by about 12mm (0.5”). This will ensure proper water drainage (See Fig. 6.5). Place the protective wall cuff in the hole. This protects the edges of the hole and will help seal it when you finish the installation process. NOTE: When drilling the wall hole, make sure to avoid wires, plumbing, and other sensitive components.
4. Pass the drain hose through the wall hole. Make sure the water drains to a safe location where it will not cause water damage or a slipping hazard.
   NOTE: The drainpipe outlet should be at least 5cm (1.9”) above the ground. If it touches the ground, the unit may become blocked and malfunction. If you discharge the water directly into a sewer, make sure that the drain has a U or S pipe to catch odors that might otherwise come back into the house.

Refrigerant Piping Connection

Safety Precautions

WARNING

• All field piping must be completed by a licensed technician and must comply with the local and national regulations. When the air conditioner is installed in a small room, measures must be taken to prevent the refrigerant concentration in the room from exceeding the safety limit in the event of refrigerant leakage. If the refrigerant leaks and its concentration exceeds its proper limit, hazards due to lack of oxygen may result.
• When installing the refrigeration system, ensure that air, dust, moisture or foreign substances do not enter the refrigerant circuit. Contamination in the system may cause poor operating capacity, high pressure in the refrigeration cycle, explosion or injury.
• Ventilate the area immediately if there is refrigerant leakage during the installation. Leaked refrigerant gas is both toxic and flammable. Ensure there is no refrigerant leakage after completing the installation work.

Notes On Pipe Length and Elevation

Ensure that the length of the refrigerant pipe, the number of bends, and the drop height between the indoor and outdoor units meets the requirements shown in your outdoor IOM.

CAUTION

Mark the data plate with the Orifice installed(for some models).

• Please purchase the fittings according to the requirements in the manual strictly.
• Refer to the diagram when installing.

CAUTION

• Oil traps
  If the indoor unit is installed higher than the outdoor unit:

  • If oil flows back into the outdoor unit’s compressor, this might cause liquid compression or deterioration of oil return. Oil traps in the rising gas piping can prevent this.
    An oil trap should be installed every 10m (32.8ft) of vertical suction line riser. (See Fig. 7.2)

The indoor unit is installed higher than the outdoor unit

CAUTION

If the outdoor unit is installed higher than the indoor unit:

• It is recommended that vertical suction risers not be upsized. Proper oil return to the compressor should be maintained with suction gas velocity. If velocities drop below7.62m/s
  (1500fpm (feet per minute)), oil return will be decreased. An oil trap should be installed every 6m(20ft) of vertical suction line riser. (See Fig. 7.3) The outdoor unit is installed higher than the indoor unit

Table 7.2

| Permitted length
---|---

Piping length

| Total piping length| 18K+18K| 30/98’| L+Max (L1, L2)
24K+24K

30K+30K

| 50/164’
(farthest distance from the line pipe branch)| 15/49’| L1, L2
(farthest distance from the line pipe branch)| 10/32.8’| L1-L2

Drop height

| Drop height between indoor and outdoor unit| 20/65.6’| H1
Drop height between two indoor units| 0.5/1.6’| H2

Refrigerant Piping Connection Instructions

CAUTION

• The branching pipe must be installed horizontally. An angle of more than 10° may cause malfunction.
• DO NOT install the connecting pipe until both indoor and outdoor units have been installed.
• Insulate both the gas and liquid piping to prevent water leakage.

Step1: Cut pipes
When preparing refrigerant pipes, take extra care to cut and flare them properly. This will ensure efficient operation and minimize the need for future maintenance.

1. Measure the distance between the indoor and outdoor units.
2. Using a pipe cutter, cut the pipe a little longer than the measured distance.

CAUTION

DO NOT deform pipe while cutting. Be extra careful not to damage, dent, or deform the pipe while cutting. This will drastically reduce the heating efficiency of the unit.

1. Make sure that the pipe is cut at a perfect 90° angle. Refer to Fig. 7.4 for examples of bad cuts

Step 2: Remove burrs.
Burrs can affect the air-tight seal of refrigerant piping connection. They must be completely removed.

1. Hold the pipe at a downward angle to prevent burrs from falling into the pipe.
2. Using a reamer or deburring tool, remove all burrs from the cut section of the pipe.

Step 3: Flare pipe ends
Proper flaring is essential to achieve an airtight seal.

1. After removing burrs from cut pipe, seal the ends with PVC tape to prevent foreign materials from entering the pipe.
2. Sheath the pipe with insulating material.
3. Place flare nuts on both ends of pipe. Make sure they are facing in the right direction, because you can’t put them on or change their direction after flaring. See Fig. 7.6
4. Remove PVC tape from ends of pipe when ready to perform flaring work.
5. Clamp flare form on the end of the pipe. The end of the pipe must extend beyond the flare form.
6. Place flaring tool onto the form.
7. Turn the handle of the flaring tool clockwise until the pipe is fully flared. Flare the pipe in accordance with the dimensions shown in table 7.3.

Table 7.3: PIPING EXTENSION BEYOND FLARE FORM

Pipe gauge| Tightening torque| Flare dimension (A) (Unit: mm/Inch)| Flare shape
---|---|---|---
Min.| Max .
Ø 6.4| 18-20N.m| 8.4/0.33| 8.7/0.34|
(183-204kgf.cm)
Ø 9.5| 25-26 N.m| 13.2/0.52| 13.5/0.53
(255-265 kgf.cm)
Ø 12.7| 35-36 N.m| 16.2/0.64| 16.5/0.65
(357-367 kgf.cm)
Ø 15.9| 45-47 N.m| 19.2/0.76| 19.7/0.78
(459-480 kgf.cm)
Ø 19.1| 65-67 N.m| ****

23.2/0.91

| ****

23.7/0.93

(663-683 kgf.cm)
Ø 22| 75-85N.m| ****

26.4/1.04

| ****

26.9/1.06

(765-867 kgf.cm)

Remove the flaring tool and flare form, then inspect the end of the pipe for cracks and even flaring.

Step 4: Connect pipes
Connect the copper pipes to the indoor unit first, then connect it to the outdoor unit. You should first connect the low-pressure pipe, then the high- pressure pipe.

1. When connecting the flare nuts, apply a thin coat of refrigeration oil to the flared ends of the pipes.

2. Align the center of the two pipes that you will connect.

3. Tighten the flare nut as tightly as possible by hand.

4. Using a spanner, grip the nut on the unit tubing.

5. While firmly gripping the nut, use a torque wrench to tighten the flare nut according to the torque values in table 7.3.
   NOTE: Use both a spanner and a torque wrench when connecting or disconnecting pipes to/from the unit. CAUTION

   • Wrap insulation around the piping. Direct contact with the bare piping may result in burns or frostbite.
   • Make sure the pipe is properly connected. Over tightening may damage the bell mouth and under tightening may lead to leakage.
     NOTE ON MINIMUM BEND RADIUS
     Carefully bend the tubing in the middle according to the diagram below. DO NOT bend the tubing more than 90° or more than 3 times.

6. After connecting the copper pipes to the indoor unit, wrap the power cable, signal cable and the piping together with binding tape.
   NOTE: DO NOT intertwine signal cable with other wires. While bundling these items together, do not intertwine or cross the signal cable with any other wiring.

7. Thread this pipeline through the wall and connect it to the outdoor unit.

8. Insulate all the piping, including the valves of the outdoor unit.

9. Open the stop valves of the outdoor unit to start the flow of the refrigerant between the indoor and outdoor unit.
   CAUTION
   Check to make sure there is no refrigerant leak after completing the installation work. If there is a refrigerant leak, ventilate the area immediately and evacuate the system (refer to the Air Evacuation section of this manual).

Wiring

Safety Precautions

WARNING

• Be sure to disconnect the power supply before working on the unit.
• All electrical wiring must be done according to local and national regulations.
• Electrical wiring must be done by a qualified technician. Improper connections may cause electrical malfunction, injury and fire.
• An independent circuit must be used for this unit. If the electrical circuit capacity is not enough or there is a defect in the electrical work, it can lead to shock, fire, unit and property damage.
• Connect the power cable to the terminals and fasten it with a clamp. An insecure connection may cause fire.
• Make sure that all wiring is done correctly and the control board cover is properly installed. Failure to do so can cause overheating at the connection points, fire, and electrical shock.
• Ensure that main supply connection is made through a switch that disconnects all poles, with contact gap of a least 3mm (0.118”).
• DO NOT modify the length of the power cord or use an extension cord.

CAUTION

• Connect the outdoor wires before connecting the indoor wires.
• Make sure you ground the unit. The grounding wire should be away from gas pipes, water pipes, lightning rods, telephone or other grounding wires. Improper grounding may cause electrical shock.
• DO NOT connect the unit to the power source until all wiring and piping is completed.
• Make sure that you do not cross your electrical wiring with your signal wiring, as this can cause distortion and interference.

Follow these instructions to prevent distortion when the compressor starts:

• The unit must be connected to the main outlet. Normally, the power supply must have a low output impedance of 32 ohms.
• No other equipment should be connected to the same power circuit.
• The unit’s power information can be found on the rating sticker on the product.

TAKE NOTE OF FUSE SPECIFICATIONS

The air conditioner’s circuit board(PCB) is designed with a fuse to provide overcurrent protection. The specifications of the fuse are printed on the circuit board, such as:
Indoor unit: T3.15A/250VAC, T5A/250VAC.
(applicable for unit adopts R32 or R290 refrigerant only)
Outdoor unit: T20A/250VAC(for <24000Btu/h unit), T30A/250VAC(for >24000Btu/h unit)

NOTE: The fuse is made of ceramic.

Outdoor Unit Wiring

WARNING
Before performing any electrical or wiring work, turn off the main power to the system.

1. Prepare the cable for connection
   • a. You must first choose the right cable size before preparing it for connection. Be sure to use H07RN-F cables.
     Table 8.1: Minimum Cross-Sectional Area of Power Cables North America** Rated Current of Appliance (A)| AWG**
     ---|---
     £7| 18
     7 – 13| 16
     13 – 18| 14
     18 – 25| 12
     25 – 30| 10

Table 8.2: Other Regions****

Rated Current of Appliance (A)| Nominal Cross-Sectional Area (mm²)
---|---
£6| 0.75
6 – 10| 1
10 – 16| 1.5
16 – 25| 2.5
25- 32| 4
32 – 45| 6

• b. Using wire strippers, strip the rubber jacket from both ends of signal cable to reveal about 15cm (5.9”) of the wires inside.
• c. Strip the insulation from the ends of the wires.
• d. Using a wire crimper, crimp u-lugs on the ends of the wires.
  NOTE: While connecting the wires, please strictly follow the wiring diagram (found inside the electrical box cover).

2. Remove the electric cover of the outdoor unit. If there is no cover on the outdoor unit, disassemble the bolts from the maintenance board and remove the protection board. (See Fig. 8.1)
3. Connect the u-lugs to the terminals Match the wire colors/labels with the labels on the terminal block, and firmly screw the u-lug of each wire to its corresponding terminal.
4. Clamp down the cable with designated cable clamp.
5. Insulate unused wires with electrical tape. Keep them away from any electrical or metal parts.
6. Reinstall the cover of the electric control box.

Indoor Unit Wiring

1. Prepare the cable for connection

   • a. Using wire strippers, strip the rubber jacket from both ends of signal cable to reveal about 15cm (5.9”) of the wires inside.
   • b. Strip the insulation from the ends of the wires.
   • c. Using wire crimper, crimp the u-lugs to the ends of the wires.

2. Open the front panel of the indoor unit. Using a screwdriver, remove the cover of the electric control box on your indoor unit.

3. Thread the power cable and the signal cable through the wire outlet.

4. Connect the u-lugs to the terminals.
   Match the wire colors/labels with the labels on the terminal block, and firmly screw the u-lug of each wire to its corresponding terminal. Refer to the Serial Number and Wiring Diagram located on the cover of the electric control box. Magnetic ring(if supplied and packed with the accessories) CAUTION

   • While connecting the wires, please strictly follow the wiring diagram.
   • The refrigerant circuit can become very hot. Keep the interconnection cable away from the copper tube.

5. Clamp down cable with the designated cable clamp to secure it in place. The cable should not be loose, and should not pull on the u-lugs.

6. Reinstall the electric box cover and the front panel of the indoor unit.

Power Specifications

NOTE: Electric auxiliary heating type circuit breaker/fuse need to add more than 10 A.

Indoor Power Supply Specifications

MODEL(Btu/h) ** £ 18K ****19K~24K 25K~36K**

POWER

| PHASE| 1 Phase| 1 Phase| 1 Phase
VOLT| 208-240V| 208-240V| 208-240V
CIRCUIT BREAKER/ FUSE(A)| 25/20| 32/25| 50/40

Outdoor Power Supply Specifications

MODEL(Btu/h) ** £ 18K ****19K~24K 25K~36K**

POWER

| PHASE| 1 Phase| 1 Phase| 1 Phase
VOLT| 208-240V| 208-240V| 208-240V
CIRCUIT BREAKER/ FUSE(A)| 25/20| 32/25| 50/40

Independent Power Supply Specifications

MODEL(Btu/h) ** £ 18K 19K~24K    25K~36K**

POWER

(indoor)

| PHASE| 1 Phase| 1 Phase| 1 Phase
VOLT| 208-240V| 208-240V| 208-240V
CIRCUIT BREAKER/ FUSE(A)| 15/10| 15/10| 15/10
POWER

(outdoor)

| PHASE| 1 Phase| 1 Phase| 1 Phase
VOLT| 208-240V| 208-240V| 208-240V
CIRCUIT BREAKER/ FUSE(A)| 25/20| 32/25| 50/40

Inverter Type A/C Power Specifications

MODEL(Btu/h) ** £ 18K 19K~24K    25K~36K**

POWER

(indoor)

| PHASE| 1 Phase| 1 Phase| 1 Phase
VOLT| 220-240V| 220-240V| 220-240V
CIRCUIT BREAKER/ FUSE(A)| 15/10| 15/10| 15/10
POWER

(outdoor)

| PHASE| 1 Phase| 1 Phase| 1 Phase
VOLT| 208-240V| 208-240V| 208-240V
CIRCUIT BREAKER/ FUSE(A)| 25/20| 25/20| 40/30
MODEL(Btu/h) ** £ 36K| 37K~60K| £ 36K**
---|---|---
POWER

(indoor)

| PHASE| 1 Phase| 1 Phase| 1 Phase
VOLT| 220-240V| 220-240V| 220-240V
CIRCUIT BREAKER/FUSE(A)| 15/10| 15/10| 15/10
POWER

(outdoor)

| PHASE| 3 Phase| 3 Phase| 3 Phase
VOLT| 380-420V| 380-420V| 208-240V
CIRCUIT BREAKER/FUSE(A)| 25/20| 32/25| 32/25

Air Evacuation

Safety Precautions

CAUTION

• Use a vacuum pump with a gauge reading lower than -0.1MPa and an air discharge capacity above 40L/min.
• The outdoor unit does not need vacuuming. DO NOT open the outdoor unit’s gas and liquid stop valves.
• Ensure that the Compound Meter reads – 0.1MPa or below after 2 hours. If after three hours of operation and the gauge reading is still above -0.1MPa, check if there is a gas leak or water inside the pipe. If there is no leakage, perform another evacuation for 1 or 2 hours.
• DO NOT use refrigerant gas to evacuate the system.

Evacuation Instructions

Before using manifold gauge and vacuum pump, read their operation manuals to familiarize yourself with how to use them properly.

1. Connect the charge hose of the manifold gauge to service port on the outdoor unit’s low pressure valve.

2. Connect another charge hose from the manifold gauge to the vacuum pump.

3. Open the Low Pressure side of the manifold gauge.Keep the High Pressure side closed.

4. Turn on the vacuum pump to evacuate the system.

5. Run the vacuum for at least 15 minutes, or until the Compound Meter reads -76cmHG (-1x105Pa).

6. Close the Low Pressure side of the manifold gauge, and turn off the vacuum pump.

7. Wait for 5 minutes, then check that there has been no change in system pressure.
   NOTE: If there is no change in system pressure, unscrew the cap from the packed valve (high pressure valve). If there is a change in system pressure, there may be a gas leak.

8. Insert hexagonal wrench into the packed valve (high pressure valve) and open the valve by turning the wrench in a 1/4 counterclockwise turn. Listen for gas to exit the system, then close the valve after 5 seconds.

9. Watch the Pressure Gauge for one minute to make sure that there is no change in pressure. The Pressure Gauge should read slightly higher than atmospheric pressure.

10. Remove the charge hose from the service port.

11. Using hexagonal wrench, fully open both the high pressure and low pressure valves.
    OPEN VALVE STEMS GENTLY W
    hen opening valve stems, turn the hexagonal wrench until it hits against the stopper. DO NOT try to force the valve to open further.

12. Tighten valve caps by hand, then tighten it using the proper tool.

Note On Adding Refrigerant

CAUTION

• Refrigerant charging must be performed after wiring, vacuuming and the leak test.
• DO NOT exceed the maximum allowable quantity of refrigerant or overcharge the system. Doing so can damage or impact the unit’s function.
• Charging with unsuitable substances may cause explosions or accidents. Ensure that the appropriate refrigerant is used.
• Refrigerant containers must be opened slowly. Always use protective gear when charging the system.
• DO NOT mix refrigerants types.

Some systems require additional charging depending on pipe lengths. The standard pipe length varies according to local regulations. For example, in North America, the standard pipe length is 7.5m (25’) In other areas, the standard pipe length is 5m (16‘). The additional refrigerant to be charged can be calculated using the following formula:
Liquid Side Diameter

| φ6.35(1/4”)| φ9.52(3/8”)| φ12.7(1/2”)
---|---|---|---

R410A:

(orifice tube in the outdoor unit):

| (Total pipe length – standard pipe length) x15g(0.16oZ)/m(ft)| (Total pipe length – standard pipe length) x30g(0.32oZ)/m(ft)| (Total pipe length – standard pipe length) x65g(0.69oZ)/m(ft)

Panel Installation

CAUTION
DO NOT place the panel facedown on the floor, against a wall, or on uneven surfaces.

Step 1: Remove the front grille.

1. Push both of the tabs towards the middle simultaneously to unlock the hook on the grille.
2. Hold the grille at a 45° angle, lift it up slightly and detach it from the main body.

Step 2: Remove the installation covers at the four corners by sliding them outwards.

Step 3: Install the panel

Align the front panel to the main body, taking into account the position of the piping and drain sides. Hang the four latches of the decorative panel to the hooks of the indoor unit. Tighten the panel hook screws evenly at the four corners. (See Fig 10.3)
NOTE: Tighten the screws until the thickness of the sponge between the main body and the panel reduces to 4-6mm (0.2-0.3”). The edge of the panel should be in contact with the ceiling well.

Adjust the panel by turning it to the arrowed direction shown in Fig 10.3 so that the ceiling opening is completely covered.

1. Connect the two louver motor connectors to the corresponding wires in the control box.

2. Remove foam stops from inside the fan.

3. Attach the side of the front grille to the panel.

4. Connect the display panel cable to the corresponding wire on the main body. CAUTION
   Failure to tighten screws can cause water leakage.
   CAUTION
   If the unit is not hung correctly and a gap exists, the unit’s height must be adjusted to ensure proper function. The unit’s height can be adjusted by loosening the upper nut, and adjusting the lower nut.

5. Close the front grille.

6. Fasten the installation covers at all four corners by pushing them inwards. (See Fig.10.6) NOTE: If the height of the indoor unit needs to be adjusted, you can do so through the openings at the panel’s four corners. Make sure that the internal wiring and drainpipe are not affected by this adjustment.

Test Run

Before Test Run

A test run must be performed after the entire system has been completely installed. Confirm the following points before performing the test:

• a) The indoor and outdoor units are properly installed.
• b) Piping and wiring are properly connected.
• c) Ensure that there are no obstacles near the inlet and outlet of the unit that might cause poor performance or product malfunction.
• d) The refrigeration system does not leak.
• e) The drainage system is unimpeded and draining to a safe location.
• f) The heating insulation is properly installed.
• g) The grounding wires are properly connected.
• h) The length of the piping and the added refrigerant stow capacity has been recorded.
• i) The supply voltage is the correct voltage for the air conditioner.

CAUTION
Failure to perform the test run may result in unit damage, property damage or personal injury.

Test Run Instructions

1. Open both the liquid and gas stop valves.
2. Turn on the main power switch and allow the unit to warm up.
3. Set the air conditioner to COOL mode.
4. For the Indoor Unit
   • a. Ensure the remote control and its buttons work properly.
   • b. Ensure the louvers move properly and can be changed using the remote control.
   • c. Double check to see if the room temperature is being registered correctly.
   • d. Ensure the indicators on the remote control and the display panel on the indoor unit work properly.
   • e. Ensure the manual buttons on the indoor unit work properly.
   • f. Check to see that the drainage system is unimpeded and draining smoothly.
   • g. Ensure there is no vibration or abnormal noise during operation.
5. For the Outdoor Unit
   • a. Check to see if the refrigeration system is leaking.
   • b. Make sure there is no vibration or abnormal noise during operation.
   • c. Ensure the wind, noise, and water generated by the unit do not disturb your neighbors or pose a safety hazard.
6. Drainage Test
   • a. Ensure the drainpipe flows smoothly. New buildings should perform this test before finishing the ceiling.
   • b. Remove the test cover. Add 2,000ml of water to the tank through the attached tube.
   • c. Turn on the main power switch and run the air conditioner in COOL mode.
   • d. Listen to the sound of the drain pump to see if it makes any unusual noises.
   • e. Check to see that the water is discharged. It may take up to one minute before the unit begins to drain depending on the drainpipe.
   • f. Make sure that there are no leaks in any of the piping.
   • g. Stop the air conditioner. Turn off the main power switch and reinstall the test cover.

NOTE: If the unit malfunctions or does not operate according to your expectations, please refer to the Troubleshooting section of the Owner’s Manual before calling customer service.

Due to ongoing product improvements, specifications and dimensions are subject to change and correction without notice or incurring obligations. Determining the application and suitability for use of any product is the responsibility of the installer.
Additionally, the installer is responsible for verifying dimensional data on the actual product prior to beginning any installation preparations.

Incentive and rebate programs have precise requirements as to product performance and certification. All products meet applicable regulations in effect on date of manufacture; however, certifications are not necessarily granted for the life of a product.
Therefore, it is the responsibility of the applicant to determine whether a specific model qualifies for these incentive/rebate programs.

1900 Wellworth Ave., Jackson, MI 49203
Ph. 517-787-2100 •
www.marsdelivers.com

References

• kgf.cm

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