Century VMH 30-36 SG Series Inverter Single Zone Ductless Mini Split Instruction Manual

Installation and Operation Manual
VMH 30/36 SG Series
Inverter Single Zone
Ductless Mini-Split

VMH 30-36 SG Series Inverter Single Zone Ductless Mini Split

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.

| This symbol indicates that ignoring instructions may cause death or serious injury.
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| This symbol indicates that ignoring instructions may cause moderate injury to your person, or damage to your unit or other property.
| This symbol indicates that you must never perform the action indicated.

WARNING
Do not modify the length of the power supply cord or use an extension cord to power the unit.
Do not share the electrical outlet with other appliances. Improper or insufficient power supply can cause fire or electrical shock.
When connecting refrigerant piping, do not let substances or gases other than the specified refrigerant enter the unit. The presence of other gases or substances will lower the unit’s capacity, and can cause abnormally high pressure in the refrigeration cycle. This can cause explosion and injury.
Do not allow children to play with the air conditioner. Children must be supervised around the unit at all times.

1. Installation must be performed by an authorized dealer or specialist. Defective installation can cause water leakage, electrical shock, or fire.

2. Installation must be performed according to the installation instructions. Improper installation can cause water leakage, electrical shock, or fire.
   (In North America,installation must be performed in accordance with the requirement of NEC and CEC by authorized personnel only.)

3. Contact an authorized service technician for repair or maintenance of this unit.

4. Only use the included accessories, parts, and specified parts for installation. Using non-standard parts can cause water leakage, electrical shock, fire, and can cause the unit to fail.

5. Install the unit in a firm location that can support the unit’s weight. If the chosen location cannot support the unit’s weight, or the installation is not done properly, the unit may drop and cause serious injury and damage.

6. For all electrical work, follow all local and national wiring standards, regulations, and the Installation Manual. You must use an independent circuit and single outlet to supply power. Do not connect other appliances to the same outlet. Insufficient electrical capacity or defects in electrical work can cause electrical shock or fire.

7. For all electrical work, use the specified cables. Connect cables tightly, and clamp them securely to prevent external forces from damaging the terminal. Improper electrical connections can overheat and cause fire, and may also cause shock.

8. All wiring must be properly arranged to ensure that the control board cover can close properly. If the control board cover is not closed properly, it can lead to corrosion and cause the connection points on the terminal to heat up, catch fire, or cause electrical shock.

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

CAUTION
For units that have an auxiliary electric heater, do not install the unit within 1 meter (3 feet) of any combustible materials.
Do not install the unit in a location that may be exposed to combustible gas leaks. If combustible gas accumulates around the unit, it may cause fire.
Do not operate your air conditioner in a wet room such as a bathroom or laundry room. Too much exposure to water can cause electrical components to short circuit.

1. The product must be properly grounded at the time of installation, or electrical shock may occur.
2. Install drainage piping according to the instructions in this manual. Improper drainage may cause water damage to your home and property.

Note about Fluorinated Gases

1. This air conditioning unit contains fluorinated gases. 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 disassembly 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.

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.

Parts
Remote controller holder| | 1
Dry battery AAA.LR03| | 2
Air freshening filter| | 1
Seal| | 1 (for cooling & heating models only)
Drain joint|
Owner’s manual| | 1
---|---|---
Installation manual| | 1
Remote controller
illustration| | 1
Connecting pipe assembly| Liquid side| Φ6.35(1/4 in)| Parts you must purchase.
Consult the dealer about the pipe size.
Φ9.52(3/8in)
Gas side| Φ9.52(3/8in)
Φ12.7(1/2in)
Φ 16(5/8in)

Installation Summary – Indoor Unit

Unit Parts

Indoor Unit Installation

Installation Instructions – Indoor Unit
PRIOR TO INSTALLATION
Before installing the indoor unit, refer to the label on the product box to make sure that the model number of the indoor unit matches the model number of the outdoor unit.
Step 1: Select installation location
Before installing the indoor unit, you must choose an appropriate location. The following are standards that will help you choose an appropriate location for the unit.
Proper installation locations meet the following standards:
Good air circulation
Convenient drainage
Noise from the unit will not disturb other people
Firm and solid—the location will not vibrate
Strong enough to support the weight of the unit
A location at least one meter from all other electrical devices (e.g., TV, radio, computer)
DO NOT install unit in the following locations:
Near any source of heat, steam, or combustible gas
Near flammable items such as curtains or clothing
Near any obstacle that might block air circulation
Near the doorway
In a location subject to direct sunlight
NOTE ABOUT WALL HOLE:
If there is no fixed refrigerant piping:
While choosing a location, be aware that you should leave ample room for a wall hole (see “Drill wall hole for connective piping” step) for the signal cable and refrigerant piping that connect the indoor and outdoor units.
The default position for all piping is the right side of the indoor unit (while facing the unit).
However, the unit can accommodate piping to either the left or right.
Refer to the following diagram to ensure proper distance from walls and ceiling:![Century VMH 30 36 SG Series Inverter Single Zone Ductless Mini Split

• Installation 1](https://manuals.plus/wp-content/uploads/2023/10/Century- VMH-30-36-SG-Series-Inverter-Single-Zone-Ductless-Mini-Split- Installation-1.png)Step 2: Attach mounting plate to wall
  The mounting plate is the device on which you will mount the indoor unit.

  1. Remove the screw that attaches the mounting plate to the back of the indoor unit.

  2. Place the mounting plate against the wall in a location that meets the standards in the Select Installation Location step. (See Mounting Plate Dimensions for detailed information on mounting plate sizes.)

  3. Drill holes for mounting screws in places that:
     • have studs and can support the weight of the unit
     • correspond to screw holes in the mounting plate

  4. Secure the mounting plate to the wall with the screws provided.

  5. Make sure that mounting plate is flat against the wall.

NOTE FOR CONCRETE OR BRICK WALLS:
If the wall is made of brick, concrete, or similar material, drill 5mm- diameter (0.2in-diameter) holes in the wall and insert the sleeve anchors provided. Then secure the mounting plate to the wall by tightening the screws directly into the clip anchors.
Step 3: Drill wall hole for connective piping
You must drill a hole in the wall for refrigerant piping, the drainage pipe, and the signal cable that will connect the indoor and outdoor units.

1. Determine the location of the wall hole based on the position of the mounting plate. Refer to Mounting Plate Dimensions on the next page to help you determine the optimal position.
   The wall hole should be 65mm (2.5in) diameter at least, and slightly – pitched toward the outdoors to facilitate drainage.

2. Using a 65-mm (2.5in) 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 5mm to 7mm (0.2-0.275in). This will ensure proper water drainage. (See Fig. 3.2 )

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.

CAUTION
When drilling the wall hole, make sure to avoid wires, plumbing, and other sensitive components. MOUNTING PLATE DIMENSIONS
Different models have different mounting plates.
In order to ensure that you have ample room to mount the indoor unit, the diagrams to the right show different types of mounting plates along with the following dimensions:

• Width of mounting plate
• Height of mounting plate
• Width of indoor unit relative to plate
• Height of indoor unit relative to plate
• Recommended position of wall hole (both to the left and right of mounting plate)
• Relative distances between screw holes

Step 4: Prepare refrigerant piping
The refrigerant piping is inside an insulating sleeve attached to the back of the unit. You must prepare the piping before passing it through the hole in the wall. Refer to the Refrigerant Piping Connection section of this manual for detailed instructions on pipe flaring and flare torque requirements, technique, etc.

1. Based on the position of the wall hole relative to the mounting plate, choose the side from which the piping will exit the unit.
2. If the wall hole is behind the unit, keep the knock-out panel in place. If the wall hole is to the side of the indoor unit, remove the plastic knock-out panel from that side of the unit.
   (See Fig. 3.3 ). This will create a slot through which your piping can exit the unit. Use needle nose pliers if the plastic panel is too difficult to remove by hand.![Century VMH 30 36 SG Series Inverter Single Zone Ductless Mini Split

• Installation 5](https://manuals.plus/wp-content/uploads/2023/10/Century- VMH-30-36-SG-Series-Inverter-Single-Zone-Ductless-Mini-Split- Installation-5.png)

  3. Use scissors to cut down the length of the insulating sleeve to reveal about 15cm (6in) of the refrigerant piping. This serves two purposes:
     • To facilitate the Refrigerant Piping Connection process
     • To facilitate Gas Leak Checks and enable you to check for dents

  4. If existing connective piping is already embedded in the wall, proceed directly to the Connect Drain Hose step. If there is no embedded piping, connect the indoor unit’s refrigerant piping to the connective piping that will join the indoor and outdoor units.
     Refer to the Refrigerant Piping Connection section of this manual for detailed instructions.

  5. Based on the position of the wall hole relative to the mounting plate, determine the necessary angle of your piping.

  6. Grip the refrigerant piping at the base of the bend.

  7. Slowly, with even pressure, bend the piping towards the hole. Do not dent or damage the piping during the process.

NOTE ON PIPING ANGLE
Refrigerant piping can exit the indoor unit from four different angles:

• Left-hand side
• Left rear
• Right-hand side
• Right rear

Refer to Fig. 3.4 for details. CAUTION
Be extremely careful not to dent or damage the piping while bending it away from the unit. Any dents in the piping will affect the unit’s performance.
Step 5: Connect drain hose
By default, the drain hose is attached to the lefthand side of unit (when you’re facing the back of the unit). However, it can also be attached to the right-hand side.

1. To ensure proper drainage, attach the drain hose on the same side that your refrigerant piping exits the unit.
2. Attach drain hose extension (purchased separately) to the end of drain hose.
3. Wrap the connection point firmly with Teflon tape to ensure a good seal and to prevent leaks.
4. For the portion of the drain hose that will remain indoors, wrap it with foam pipe insulation to prevent condensation.
5. Remove the air filter and pour a small amount of water into the drain pan to make sure that water flows from the unit smoothly.

NOTE ON DRAIN HOSE PLACEMENT
Make sure to arrange the drain hose according to Fig. 3.5.
DO NOT kink the drain hose.
DO NOT create a water trap.
DO NOT put the end of drain hose in water or a container that will collect water.
PLUG THE UNUSED DRAIN HOLE
To prevent unwanted leaks you must plug the unused drain hole with the rubber plug provided. BEFORE PERFORMING ELECTRICAL WORK, READ THESE REGULATIONS

1. All wiring must comply with local and national electrical codes, and must be installed by a licensed electrician.
2. All electrical connections must be made according to the Electrical Connection Diagram located on the panels of the indoor and outdoor units.
3. If there is a serious safety issue with the power supply, stop work immediately. Explain your reasoning to the client, and refuse to install the unit until the safety issue is properly resolved.
4. Power voltage should be within 90-100% of rated voltage. Insufficient power supply can cause malfunction, electrical shock, or fire.
5. If connecting power to fixed wiring, install a surge protector and main power switch with a capacity of 1.5 times the maximum current of the unit.
6. If connecting power to fixed wiring, a switch or circuit breaker that disconnects all poles and has a contact separation of at least 1/8in (3mm) must be incorporated in the fixed wiring. A qualified technician must use an approved circuit breaker.
7. Connect the unit only to an individual branch circuit outlet. Do not connect another appliance to that outlet.
8. Make sure to properly ground the air conditioner.
9. Every wire must be firmly connected. Loose wiring can cause the terminal to overheat, resulting in product malfunction and possible fire.
10. Do not let wires touch or rest against refrigerant tubing, the compressor, or any moving parts within the unit.

WARNING
BEFORE PERFORMING ANY ELECTRICAL OR WIRING WORK, TURN OFF THE MAIN POWER TO THE SY STEM .
Step 6: Connect signal cable
The signal cable enables communication between the indoor and outdoor units. You must first choose the right cable size before preparing it for connection.
Cable Types

• Indoor Power Cable (if applicable):
  H05VV-F or H05V2V2-F

• Outdoor Power Cable: H07RN-F

• Signal Cable: H07RN-F
  Minimum Cross-Sectional Area of Power and Signal Cables

North America

Other Regions

CHOOSE THE RIGHT CABLE SIZE
The size of the power supply cable, signal cable, fuse, and switch needed is determined by the maximum current of the unit. The maximum current is indicated on the nameplate located on the side panel of the unit. Refer to this nameplate to choose the right cable, fuse, or switch.
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:
T3.15A/250VAC, T5A/250VAC, etc.

1. Prepare the cable for connection:
   a. Using wire strippers, strip the rubber jacket from both ends of signal cable to reveal about 40mm (1.57in) of the wires inside.
   b. Strip the insulation from the ends of the wires.
   c. Using wire crimper, crimp u-type lugs on the ends of the wires.
   PAY ATTENTION TO LIVE WIRE
   While crimping wires, make sure you clearly distinguish the Live (“L”) Wire from other wires.

2. Open front panel of the indoor unit.

3. Using a screwdriver, open the wire box cover on the right side of the unit. This will reveal the terminal block. WARNING
   ALL WIRING MUST PERFORMED STRICTLY IN ACCORDANCE WITH THE WIRING DIAGRAM LOCATED ON THE INSIDE OF THE INDOOR UNIT S WIRE COVER.

4. Unscrew the cable clamp below the terminal block and place it to the side.

5. Facing the back of the unit, remove the plastic panel on the bottom left-hand side.

6. Feed the signal wire through this slot, from the back of the unit to the front.

7. Facing the front of the unit, match the wire colors with the labels on the terminal block, connect the u-lug and and firmly screw each wire to its corresponding terminal.
   CAUTION
   DO NOT MIX UP LIVE AND NULL WIRES
   This is dangerous, and can cause the air conditioning unit to malfunction.

8. After checking to make sure every connection is secure, use the cable clamp to fasten the signal cable to the unit. Screw the cable clamp down tightly.

9. Replace the wire cover on the front of the unit, and the plastic panel on the back.

NOTE ABOUT WIRING
THE WIRING CONNECTION PROCESS MAY DIFFER SLIGHTLY BETWEEN UNITS.
Step 7: Wrap piping and cables
Before passing the piping, drain hose, and the signal cable through the wall hole, you must bundle them together to save space, protect them, and insulate them.

1. Bundle the drain hose, refrigerant pipes, and signal cable according to Fig. 3.12.DRAIN HOSE MUST BE ON BOTTOM
   Make sure that the drain hose is at the bottom of the bundle. Putting the drain hose at the top of the bundle can cause the drain pan to overflow, which can lead to fire or water damage.
   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.

2. Using adhesive vinyl tape, attach the drain hose to the underside of the refrigerant pipes.

3. Using insulation tape, wrap the signal wire, refrigerant pipes, and drain hose tightly together. Double-check that all items are bundled in accordance with Fig. 3.12.

DO NOT WRAP ENDS OF PIPING
When wrapping the bundle, keep the ends of the piping unwrapped. You need to access them to test for leaks at the end of the installation process (refer to Electrical Checks and Leak Checks section of this manual).
Step 8: Mount indoor unit
If you installed new connective piping to the outdoor unit, do the following:

1. If you have already passed the refrigerant piping through the hole in the wall, proceed to Step 4.
2. Otherwise, double-check that the ends of the refrigerant pipes are sealed to prevent dirt or foreign materials from entering the pipes.
3. Slowly pass the wrapped bundle of refrigerant pipes, drain hose, and signal wire through the hole in the wall.
4. Hook the top of the indoor unit on the upper hook of the mounting plate.
5. Check that unit is hooked firmly on mounting by applying slight pressure to the left and right-hand sides of the unit. The unit should not jiggle or shift.
6. Using even pressure, push down on the bottom half of the unit. Keep pushing down until the unit snaps onto the hooks along the bottom of the mounting plate.
7. Again, check that the unit is firmly mounted by applying slight pressure to the left and the right-hand sides of the unit.

If refrigerant piping is already embedded in the wall, do the following:

1. Hook the top of the indoor unit on the upper hook of the mounting plate.
2. Use a bracket or wedge to prop up the unit, giving you enough room to connect the refrigerant piping, signal cable, and drain hose. Refer to Fig. 3.13 for an example.
3. Connect drain hose and refrigerant piping (refer to Refrigerant Piping Connection section of this manual for instructions).
4. Keep pipe connection point exposed to perform the leak test (refer to Electrical Checks and Leak Checks section of this manual).
5. After the leak test, wrap the connection point with insulation tape.
6. Remove the bracket or wedge that is propping up the unit.
7. Using even pressure, push down on the bottom half of the unit. Keep pushing down until the unit snaps onto the hooks along the bottom of the mounting plate.

Outdoor Unit Installation

Installation Instructions – Outdoor Unit
Step 1: Select installation location
Before installing the outdoor unit, you must choose an appropriate location. The following are standards that will help you choose an appropriate location for the unit.
Proper installation locations meet the following standards:
Meets all spatial requirements shown in Installation Space Requirements ( Fig. 4.1 )
Good air circulation and ventilation
Firm and solid—the location can support the unit and will not vibrate
Noise from the unit will not disturb others
Protected from prolonged periods of direct sunlight or rain

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

DO NOT install unit in the following locations:
Near an obstacle that will block air inlets and outlets
Near a public street, crowded areas, or where noise from the unit will disturb others
Near animals or plants that will be harmed by hot air discharge
Near any source of combustible gas
In a location that is exposed to large amounts of dust
In a location exposed to excessive amounts of salty air
SPECIAL CONSIDERATIONS FOR EXTREME WEATHER
If the unit is exposed to heavy wind:
Install unit so that air outlet fan is at a 90° angle to the direction of the wind. If needed, build a barrier in front of the unit to protect it from extremely heavy winds.
See Fig. 4.2 and Fig. 4.3 below.If the unit is frequently exposed to heavy rain or snow:
Build a shelter above the unit it to protect it from the rain or snow. Be careful not to obstruct air flow around the unit.
Step 2: Install drain joint
Heat pump units require a drain joint. Before bolting the outdoor unit in place, you must install the drain joint at the bottom of the unit. Note that there are two different types of drain joints depending on the type of outdoor unit.
If the drain joint comes with a rubber seal (see Fig. 4.4 – 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. 4.4 – 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.

IN COLD CLIMATES
In cold climates, make sure that the drain hose is as vertical as possible to ensure swift water drainage. If water drains too slowly, it can freeze in the hose and flood the unit.
Step 3: Anchor outdoor unit
The outdoor unit can be anchored to the ground or to a wall-mounted bracket.
UNIT MOUNTING DIMENSIONS
The following is a list of different outdoor unit sizes and the distance between their mounting feet.
Prepare the installation base of the unit according to the dimensions below.

Outdoor Unit Dimensions (mm/in)
W x H x D|

Mounting Dimensions

---|---
Distance A (mm/in)| Distance B (mm/in)
(26.8”x17”x11.2”) 681x434x285|  (18.10”) 460|  (11.49”) 292
(27.5”x21.6”x10.62”) 700x550x270|  (17.7”) 450|  (10.24”) 260
(30.7”x21.25”x9.85”) 780x540x250| (21.6”) 549|  (10.85”) 276
(33.25”x27.5”x12.6”) 845x700x320|  (22”) 560| (13.2”) 335
(31.9”x22”x12.2”) 810x558x310|  (21.6”)549|  (12.8”) 325
(27.5”x21.6”x10.82”) 700x550x275|  (17.7”) 450|  (10.24”) 260
(30.3”x21.85”x11.81”) 770x555x300|  (19.2”) 487|  (11.73”) 298
(31.5”x21.8”x13.1”) 800x554x333|  (20.24”) 514|  (13.39”) 340
(33.25”x27.63”x14.29”) 845x702x363|  (21.26”) 540|  (13.8”) 350
(35.4”x33.85”x12.4”) 900x860x315|  (23.2”) 590|  (13.1”) 333
(37.2”x31.9”x15.55”) 945x810x395|  (25.2”) 640|  (15.95”) 405
(37.21”x31.9”x16.53”) 946x810x420| (26.5”) 673|  (15.87”) 403
(37.21”x31.9”x16.14”) 946x810x410|  (26.5”) 673|  (15.87”) 403

If you will install the unit on the ground or on a concrete mounting platform, do the following:

1. Mark the positions for four expansion bolts based on dimensions in the Unit Mounting Dimensions chart.
2. Pre-drill holes for expansion bolts.
3. Clean concrete dust away from holes.
4. Place a nut on the end of each expansion bolt.
5. Hammer expansion bolts into the pre-drilled holes.
6. Remove the nuts from expansion bolts, and place outdoor unit on bolts.
7. Put washer on each expansion bolt, then replace the nuts.
8. Using a wrench, tighten each nut until snug.

WARNING
WHEN DRILLING INTO CONCRETE, EYE PROTECTION IS RECOMMENDED AT ALL TIMES.
If you will install the unit on a wall-mounted bracket, do the following:
CAUTION
Before installing a wall-mounted unit, make sure that the wall is made of solid brick, concrete, or of similarly strong material. The wall must be able to support at least four times the weight of the unit.

1. Mark the position of bracket holes based on dimensions in the Unit Mounting Dimensions chart.
2. Pre-drill the holes for the expansion bolts.
3. Clean dust and debris away from holes.
4. Place a washer and nut on the end of each expansion bolt.
5. Thread expansion bolts through holes in mounting brackets, put mounting brackets in position, and hammer expansion bolts into the wall.
6. Check that the mounting brackets are level.
7. Carefully lift unit and place its mounting feet on brackets.
8. Bolt the unit firmly to the brackets.

TO REDUCE VIBRATIONS OF WALLMOUNTED UNIT
If allowed, you can install the wall-mounted unit with rubber gaskets to reduce vibrations and noise.
Step 4: Connect signal and power cables
The outside unit’s terminal block is protected by an electrical wiring cover on the side of the unit.
A comprehensive wiring diagram is printed on the inside of the wiring cover.
BEFORE PERFORMING ELECTRICAL WORK, READ THESE REGULATIONS

1. All wiring must comply with local and national electrical codes, and must be installed by a licensed electrician.

2. All electrical connections must be made according to the Electrical Connection
   Diagram located on the side panels of the indoor and outdoor units.

3. If there is a serious safety issue with the power supply, stop work immediately. Explain your reasoning to the client, and refuse to install the unit until the safety issue is properly resolved.

4. Power voltage should be within 90-100% of rated voltage. Insufficient power supply can cause electrical shock or fire.

5. If connecting power to fixed wiring, install a surge protector and main power switch with a capacity of 1.5 times the maximum current of the unit.

6. If connecting power to fixed wiring, a switch or circuit breaker that disconnects all poles and has a contact separation of at least 1/8in (3mm) must be incorporated in the fixed wiring. A qualified technician must use an approved circuit breaker or switch.

7. Connect the unit only to an individual branch circuit outlet. Do not connect another appliance to that outlet.

8. Make sure to properly ground the air conditioner.

9. Every wire must be firmly connected. Loose wiring can cause the terminal to overheat, resulting in product malfunction and possible fire.

10. Do not let wires touch or rest against refrigerant tubing, the compressor, or any moving parts within the unit.

11. If the unit has an auxiliary electric heater, it must be installed at least 1 meter (40in) away from any combustible materials.

WARNING
BEFORE PERFORMING ANY ELECTRICAL OR WIRING WORK, TURN OFF THE MAIN POWER TO THE SYSTEM.

1. Prepare the cable for connection:
   USE THE RIGHT CABLE
   • Indoor Power Cable (if applicable): H05VV-F or H05V2V2-F
   • Outdoor Power Cable: H07RN-F
   • Signal Cable: H07RN-F
   Minimum Cross-Sectional Area of Power and Signal Cables
   North AmericaAppliance Amps (A)| AWG
   ---|---
   10| 18
   13| 16
   18| 14
   25| 12
   30| 10

Other Regions

a. Using wire strippers, strip the rubber jacket from both ends of cable to reveal about 40mm (1.57in) of the wires inside.
b. Strip the insulation from the ends of the wires.
c. Using a wire crimper, crimp u-lugs on the ends of the wires.
PAY ATTENTION TO LIVE WIRE
While crimping wires, make sure you clearly distinguish the Live (“L”) Wire from other wires.
WARNING
ALL WIRING MUST PERFORMED STRICTLY IN ACCORDANCE WITH THE WIRING DIAGRAM LOCATED INSIDE THE OUTDOOR UNIT’S WIRE COVER.

2. Unscrew the electrical wiring cover and remove it.

3. Unscrew the cable clamp below the terminal block and place it to the side.

4. 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.

5. After checking to make sure every connection is secure, loop the wires around to prevent rain water from flowing into the terminal.

6. Using the cable clamp, fasten the cable to the unit. Screw the cable clamp down tightly.

7. Insulate unused wires with PVC electrical tape.
   Arrange them so that they do not touch any electrical or metal parts.

8. Replace the wire cover on the side of the unit, and screw it in place.

Refrigerant Piping Connection

Note on Pipe Length
The length of refrigerant piping will affect the performance and energy efficiency of the unit. Nominal efficiency is tested on units with a pipe length of 5 meters (16.5ft).
Refer to the table below for specifications on the maximum length and drop height of piping.
Maximum Length and Drop Height of Refrigerant Piping per Unit Model

Connection Instructions – Refrigerant Piping
Step 1: 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.
3. Make sure that the pipe is cut at a perfect 90° angle. Refer to Fig. 5.1 for bad cut examples.

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.
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. 5.3 .

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 edge of the flare form in accordance with the dimensions shown in the table below. PIPING EXTENSION BEYOND FLARE FORMOuter Diameter of
   Pipe (mm)| A (mm)
   ---|---
   Min.| Max.
   Ø 6.35 (Ø 0.25”)| 0.7 (0.0275”)| 1.3 (0.05”)
   Ø 9.52 ( Ø 0.375”)| 1.0 (0.04”)| 1.6 (0.063”)
   Ø 12.7 ( Ø 0.5”)| 1.0 (0.04”)| 1.8 (0.07”)
   Ø 16 ( Ø 0.63”)| 2.0 (0.078”)| 2.2 (0.086”)

6. Place flaring tool onto the form.

7. Turn the handle of the flaring tool clockwise until the pipe is fully flared.

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

Step 4: Connect pipes
When connecting refrigerant pipes, be careful not to use excessive torque or to deform the piping in any way. You should first connect the low-pressure pipe, then the high-pressure pipe.
MINIMUM BEND RADIUS
When bending connective refrigerant piping, the minimum bending radius is 10cm (4″). See Fig 5.6 .Instructions for Connecting Piping to Indoor Unit

1. Align the center of the two pipes that you will connect. See Fig. 5.7.
2. Tighten the flare nut as tightly as possible by hand.
3. Using a spanner, grip the nut on the unit tubing.
4. While firmly gripping the nut on the unit tubing, use a torque wrench to tighten the flare nut according to the torque values in the Torque Requirements table below. Loosen the flaring nut slightly, then tighten again.

Outer Diameter of Pipe (mm)| Tightening Torque (N•cm)| Add. Tightening Torque (N•m)
---|---|---
(Ø 0.25”) Ø 6.35|  (11lb ft) 1,500| (11.8lb ft) 1,600
(Ø 0.375”) Ø 9.52|  (18.4lb ft) 2,500| (19.18lb ft) 2,600
( Ø 0.5”) Ø 12.7| (25.8lb ft) 3,500| (26.55lb ft) 3,600
( Ø 0.63”) Ø 16| (33.19lb ft) 4,500| (34.67lb ft) 4,700

DO NOT USE EXCESSIVE TORQUE
Excessive force can break the nut or damage the refrigerant piping. You must not exceed torque requirements shown in the table above.
Instructions for Connecting Piping to Outdoor Unit

1. Unscrew the cover from the packed valve on the side of the outdoor unit. (See Fig. 5.9 )

2. Remove protective caps from ends of valves.

3. Align flared pipe end with each valve, and tighten the flare nut as tightly as possible by hand.

4. Using a spanner, grip the body of the valve.
   Do not grip the nut that seals the service valve. (See Fig. 5.10 )
   USE SPANNER TO GRIP MAIN BODY OF VALVE
   Torque from tightening the flare nut can snap off other parts of valve.

5. While firmly gripping the body of the valve, use a torque wrench to tighten the flare nut according to the correct torque values.

6. Loosen the flaring nut slightly, then tighten again.

7. Repeat Steps 3 to 6 for the remaining pipe.

Air Evacuation

Preparations and Precautions
Air and foreign matter in the refrigerant circuit can cause abnormal rises in pressure, which can damage the air conditioner, reduce its efficiency, and cause injury. Use a vacuum pump and manifold gauge to evacuate the refrigerant circuit, removing any non-condensable gas and moisture from the system.
Evacuation should be performed upon initial installation and only time the unit is relocated.
BEFORE PERFORMING EVACUATION
Check to make sure that both highpressure and low-pressure pipes between the indoor and outdoor units are connected properly in accordance with the Refrigerant Piping Connection section of this manual.
Check to make sure all wiring is connected properly.
Evacuation Instructions
Before using the 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 pump for at least 15 minutes, or until the Compound Meter reads -29″ Mercury (750 micron).

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.

8. If there is a change in system pressure, refer to Gas Leak Check section for information on how to check for leaks. If there is no change in system pressure, unscrew the cap from the packed valve (high pressure valve).

9. 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.

10. 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.

11. Remove the charge hose from the service port.

12. Using hexagonal wrench, fully open both the high pressure and low pressure valves.

13. Tighten valve caps on all three valves (service port, high pressure, low pressure) by hand.
    You may tighten it further using a torque wrench if needed.

OPEN VALVE SYSTEMS GENTLY
When opening valve stems, turn the hexagonal wrench until it hits against the stopper. Do not try to force the valve to open further.
Note on Adding Refrigerant
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 (25ft).
In other areas, the standard pipe length is 5m (16ft). The additional refrigerant to be charged can be calculated using the following formula:
ADDITIONAL REFRIGERANT PER PIPE LENGTH

N/A

Standard pipe length| Vacuum Pump| Liquid Side: Ø 6.35 (ø 0.25”)  Inverter
(Pipe length – standard length) x 0.16oZ/
ft(Pipe length – standard length) x 15g/m| Liquid Side: Ø 9.52 (ø 0.375”) Inverter
(Pipe length – standard length) x 0.32oZ/ft
(Pipe length – standard length) x 30g/m

CAUTION
DO NOT mix refrigerant types.

Electrical and Gas Leak Checks

Electrical Safety Checks
After installation, confirm that all electrical wiring is installed in accordance with local and national regulations, and according to the Installation Manual.
BEFORE TEST RUN
Check Grounding Work
Measure grounding resistance by visual detection and with grounding resistance tester. Grounding resistance must be less than 4.
Note : This may not be required for some locations in the US.
DURING TEST RUN
Check for Electrical Leakage
During the Test Run, use multimeter to perform a comprehensive electrical leakage test.
If electrical leakage is detected, turn off the unit immediately and call a licensed electrician to find and resolve the cause of the leakage.
Note : This may not be required for some locations in the US.
WARNING – RISK OF ELECTRIC SHOCK
ALL WIRING MUST COMPLY WITH LOCAL AND NATIONAL ELECTRICAL CODES, AND MUST BE INSTALLED BY A LICENSED ELECTRICIAN.
Gas Leak Checks
There are two different methods to check for gas leaks.
Soap and Water Method:
Using a soft brush, apply soapy water or liquid detergent to all pipe connection points on the indoor unit and outdoor unit. The presence of bubbles indicates a leak.
Leak Detector Method:
If using leak detector, refer to the device’s operation manual for proper usage instructions.
AFTER PERFORMING GAS LEAK CHECKS
After confirming that the all pipe connection points DO NOT leak, replace the valve cover on the outside unit.
Any detected leaks must be fixed prior to unit operation.

Test Run

Before Test Run
Perform test run after you have completed the following steps:

• Electrical Safety Checks– Confirm that the unit’s electrical system is safe and operating properly
• Gas Leak Checks –Check all flare nut connections and confirm that the system is not leaking
• Confirm that gas and liquid (high and low pressure) valves are fully open

Test Run Instructions
You should perform the Test Run for at least 30 minutes.

1. Connect power to the unit.

2. Press the ON/OFF button on the remote controller to turn it on.

3. Press the MODE button to scroll through the following functions, one at a time:
   • COOL – Select lowest possible temperature
   • HEAT – Select highest possible temperature

4. Let each function run for 5 minutes, and perform the following checks:
   List of Checks to Perform PASS/FAIL

   No electrical leakage| |
   Unit is properly grounded| |
   All electrical terminals properly covered| |
   Indoor and outdoor units are solidly installed| |
   All pipe connection points do not leak| Outdoor (2):| Indoor (2):
   Water drains properly from drain hose| |
   All piping is properly insulated| |
   Unit performs COOL function properly| |
   Unit performs HEAT function properly| |
   Indoor unit louvers rotate properly| |
   Indoor unit responds to remote controller| |

DOUBLE-CHECK PIPE CONNECTIONS
During operation, the pressure of the refrigerant circuit will increase. This may reveal leaks that were not present during your initial leak check. Take time during the Test Run to double-check that all refrigerant pipe connection points do not have leaks.
Refer to Gas Leak Check section for instructions.

5. After the Test Run is successfully complete, and you confirm that all checks points in List of Checks to Perform have PASSED, do the following:
   a. Using remote control, return unit to normal operating temperature.
   b. Using insulation tape, wrap the indoor refrigerant pipe connections that you left uncovered during the indoor unit installation process.

IF AMBIENT TEMPERATURE IS BELOW 17°C (63°F)
You can’t use the remote controller to turn on the COOL function when the ambient temperature is below 17°C. In this instance, you can use the MANUAL CONTROL button to test the COOL function.

1. Lift the front panel of the indoor unit, and raise it until it clicks in place.
2. The MANUAL CONTROL button is located on the right-hand side of the unit. Press it 2 times to select the COOL function. See Fig 8.1 .
3. Perform Test Run as normal.

Notes
LIMITED EXPRESS WARRANTY
Congratulations on purchasing your new HVAC equipment. It’s been designed for long life and reliable service, and is backed by one of the strongest warranties in the industry. Your unit automatically qualifies for the warranty coverage listed below, providing you keep your proof of purchase (receipt) for the equipment and meet the warranty conditions.
LIMITED FIVE (5) YEAR EXPRESS WARRANTY
MARS warrants all parts of the VMH-SG Series Ductless Mini-Split to be free from defects in workmanship and materials for normal use and maintenance for five (5) years from the date of purchase by the original consumer for the original installation. This Express Limited Warranty applies only when the Ductless Mini-Split is installed as a complete matched system: outdoor unit and indoor unit, and only when the system is installed per MARS installation instructions and in accordance with all local, state and national codes for normal use.
LIMITED 3rd to 6th YEAR EXPRESS WARRANTY
The compressor only is warranted to be free from defects in workmanship and materials for normal use and maintenance for five (5) additional years, for a total of six (6) years from the date of purchase by the original consumer for the original installation. This Express Limited Warranty applies only when the Ductless Mini-Split is installed as a complete matched system: outdoor unit and indoor unit, and only when the system is installed per MARS installation instructions and in accordance with all local, state and national codes for normal use.
EXCEPTIONS
The Limited Express Warranty does not cover normal maintenance—MARS recommends that regular inspection/maintenance be performed at least once a season and proof of maintenance be kept. Additionally, labor charges, transportation charges for replacement parts, replacement of refrigerant or filters, any other service calls/repairs are not covered by this Limited Warranty.
It also does not cover any portion or component of the system that is not supplied by MARS, regardless of the cause of failure of such portion or component.
CONDITIONS FOR WARRANTY COVERAGE

• Unit must be operated according to MARS operating instructions included with the unit and cannot have been subjected to accident, alteration, improper repair, neglect or misuse, or an act of God (such as a flood)
• Installation was done by a trained, licensed or otherwise qualified HVAC dealer/contractor
• Performance cannot be impaired by use of any product not authorized by MARS, or by any adjustments or adaptations to components
• Serial numbers and/or rating plate have not been altered or removed
• Damage has not been a result of inadequate wiring or voltage conditions, use during brown-out conditions, or circuit interruptions
• Air flow around any section of the unit has not been restricted
• Unit remains in the original installation
• Unit was not purchased over the internet

DURATION OF WARRANTY & REGISTRATION
The warranty begins on the date of purchase by the original consumer.
The consumer must retain a receipted bill of sale as proof of warranty period. Without this proof, the express warranty begins on the date of shipment from the factory.
REMEDY PROVIDED BY THE LIMITED EXPRESS WARRANTY
The sole remedy under the Limited Warranty is replacement of the defective part. If replacement parts are required within the period of this warranty, MARS replacement parts shall be used; any warranty on the replacement part(s) shall not affect the applicable original unit warranty. Ready access to the unit for service is the owner’s responsibility. Labor to diagnose and replace the defective part is not covered by this Limited Express Warranty.
If for any reason the replacement part/product is no longer available during the warranty period, MARS shall have the right to allow a credit in the amount of the current suggested retail price of the part/product instead of providing repair or replacement.
LIMITATION OF LIABILITY

1. There are no other express or implied warranties. MARS makes no warranty of merchantability. We do not warrant that the unit is suitable for any particular purpose or can be used in buildings or rooms of any particular size or condition except as specifically provided in this document. There are no other warranties, express or implied, which extend beyond the description in this document.

2. All warranties implied by law are limited in duration to the sevenyear term of the parts warranty.
   Your exclusive remedy is limited to the replacement of defective parts. We will not be liable for any consequential or incidental damages caused by any defect in this unit.

3. This warranty gives you specific legal rights and you may also have other rights which vary from state to state. Some states do not allow limitation on how long an implied warranty lasts or do not allow the exclusion or limitation of incidental or consequential damages, so the above limitations or exclusions may not apply to you.

4. No warranties are made for units sold outside the continental United States and Canada. Your distributor or final seller may provide a warranty on units sold outside these areas.

5. MARS will not be liable for damages if our performance regarding warranty resolution is delayed by events beyond our control including accident, alteration, abuse, war, government restrictions, strikes, fire, flood, or other acts of God.

HOW TO OBTAIN WARRANTY SERVICE OR PARTS
If you have a warranty claim, notify your installer promptly. If the installer does not remedy your claim, write to MARS, 1900 Wellworth Ave., Jackson MI 49203. Enclose a report of inspection by your installer or service person.
Include model number, serial number, and date of purchase.
Owner responsibilities are set forth in the instruction manual—read it carefully.
Please visit www.marsdelivers.com
to register your new product KEEP THIS INFORMATION AS A RECORD OF YOUR PURCHASE

Remember to retain your bill of sale as proof of warranty period.
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.comfort- aire.com • www.century-hvac.com
www.marsdelivers.com
10/2022

References

• century-hvac.com
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