DAIKIN RXM18VVJU R32 Split Series Room Air Conditioner Instruction Manual

DAIKIN RXM18VVJU R32 Split Series Room Air Conditioner Instruction Manual

Safety Considerations

Refer also to the General Safety Considerations in the separate booklet.

DANGER

• Refrigerant gas is heavier than air and replaces oxygen. A massive leak can lead to oxygen depletion, especially in basements, and an asphyxiation hazard could occur leading to serious injury or death.
• Do not ground units to water pipes, gas pipes, telephone wires, or lightning rods as incomplete grounding can cause a severe shock hazard resulting in severe injury or death. Additionally, grounding to gas pipes could cause a gas leak and potential explosion causing severe injury or death.
• If refrigerant gas leaks during installation, ventilate the area immediately. Refrigerant gas may produce toxic gas if it comes into contact with fire. Exposure to this gas could cause severe injury or death.
• After completing the installation work, check that the refrigerant gas does not leak throughout the system.
• Do not install unit in an area where flammable materials are present due to risk of explosions that can cause serious injury or death.
• Safely dispose all packing and transportation materials in accordance with federal/state/local laws or ordinances. Packing materials such as nails and other metal or wood parts, including plastic packing materials used for transportation may cause injuries or death by suffocation.

WARNING

• Only qualified personnel licensed or certified in their jurisdiction must carry out the installation work. Installation must be done in accordance with this installation manual. Improper installation may result in water leakage, electric shock, or fire.
• Pipe work and installation shall be in compliance with national codes (ASHRAE15 or IRC).
• When installing the unit in a small room, take measures to keep the refrigerant concentration from exceeding allowable safety limits. Excessive refrigerant leaks, in the event of an accident in a closed ambient space, can lead to oxygen deficiency.
• Use only specified accessories and parts for installation work. Failure to use specified parts may result in water leakage, electric shock, fire, or the unit falling.
• Install the air conditioner or heat pump on a foundation strong enough that it can withstand the weight of the unit. A foundation of insufficient strength may result in the unit falling and causing injuries.
• Take into account strong winds, typhoons, or earthquakes when installing. Improper installation may result in the unit falling and causing accidents.
• Make sure that a separate power supply circuit is provided for this unit and that all electrical work is carried out by qualified personnel licensed or certified in their jurisdiction according to local, state, and national regulations. An insufficient power supply capacity or improper electrical construction may lead to electric shock or fire.
• Make sure that all wiring is secured, that specified wires are used, and that no external forces act on the terminal connections or wires. Improper connections or installation may result in fire.
• When wiring, position the wires so that the electrical wiring box cover can be securely fastened. Improper positioning of the electrical wiring box cover may result in electric shock, fire, or the terminals overheating.
• Before touching electrical parts, turn off the unit.
• The circuit must be protected with safety devices in accordance with local and national codes, i.e. a circuit breaker.
• Securely fasten the outdoor unit terminal cover (panel). If the terminal cover/panel is not installed properly, dust or water may enter the outdoor unit causing fire or electric shock.
• When installing or relocating the system, keep the refrigerant circuit free from substances other than the specified refrigerant (R32) such as air. Any presence of air or other foreign substance in the refrigerant circuit can cause an abnormal pressure rise or rupture, resulting in injury.
• Do not change the setting of the protection devices. If the pressure switch, thermal switch, or other protection device is shorted and operated forcibly, or parts other than those specified by Daikin are used, fire or explosion may occur.
• When installing or relocating the air conditioner, do not let any other substances besides R32, such as air, enter the refrigerant circuit. The presence of air or foreign matter in the refrigerant circuit causes an abnormal pressure rise, which may result in equipment damage and even injury.
• Do not use means to accelerate the defrosting process (if possible) or to clean, other than those recommended by the manufacturer.
• The appliance must be stored in a room without continuously operating ignition sources (for example: open flames, an operating gas appliance or an operating electric heater).
• Do not pierce or burn.
• Be aware that refrigerants may not contain an odor.
• Comply with national gas regulations.

CAUTION

• Do not touch the switch with wet fingers. Touching a switch with wet fingers can cause electric shock.

• Do not allow children to play on or around the unit to prevent injury.

• Wear adequate personal protective equipment (protective gloves, safety glasses,…) when installing, maintaining or servicing the system.

• The heat exchanger fins are sharp enough to cut. To avoid injury, wear gloves or cover the fins while working around them.

• Do not touch the refrigerant pipes during and immediately after operation as the refrigerant pipes may be hot or cold, depending on the condition of the refrigerant flowing through the refrigerant piping, compressor, and other refrigerant cycle parts. Your hands may suffer burns or frostbite if you touch the refrigerant pipes. To avoid injury, give the pipes time to return to normal temperature or, if you must touch them, be sure to wear proper gloves.

• Install drain piping to ensure proper drainage. Improper drain piping may result in water leakage and property damage.

• Insulate piping to prevent condensation.

• Be careful when transporting the product.

• Do not turn off the power immediately after stopping operation. Always wait for at least 5 minutes before turning off the power. Otherwise, water leakage may occur.

• Do not use a charging cylinder. Using a charging cylinder may cause the refrigerant to deteriorate.

• Refrigerant R32 in the system must be kept clean, dry, and tight.
  (a) Clean and Dry — Foreign materials (including mineral oils such as SUNISO oil or moisture) should be prevented from getting into the system.
  (b) Tight — R32 does not contain any chlorine, does not destroy the ozone layer, and does not reduce the earth’s protection again harmful ultraviolet radiation. R32 can contribute to the greenhouse effect if it is released. Therefore take proper measures to check for the tightness of the refrigerant piping installation. Read the chapter Refrigerant Piping and follow the procedures.

• The outdoor unit is for R32. See the catalog for indoor models that can be connected. Normal operation is not possible when connected to non-compatible indoor units.

• Remote controller (wireless kit) transmitting distance can be shorter than expected in rooms with electronic fluorescent lamps (inverter or rapid start types). Install the indoor unit far away from fluorescent lamps as much as possible.

• Do not install the air conditioner or heat pump in the following locations:
  (a) Where a mineral oil mist or oil spray or vapor is produced, for example, in a kitchen. Plastic parts may deteriorate and fall off or result in water leakage.
  (b) Where corrosive gas, such as sulphurous acid gas, is produced. Corroding copper pipes or soldered parts may result in refrigerant leakage.
  (c) Near machinery emitting electromagnetic waves. Electromagnetic waves may disturb the operation of the control system and cause the unit to malfunction.
  (d) Where flammable gas may leak, where there is carbon fiber, or ignitable dust suspension in the air, or where volatile flammables such as thinner or gasoline are handled. Operating the unit in such conditions can cause a fire.

• Take adequate measures to prevent the outdoor unit from being used as a shelter by small animals. Small animals making contact with electrical parts can cause malfunctions, smoke, or fire. Instruct the user to keep the area around the unit clean.

• Servicing shall be performed only as recommended by the manufacturer and licensed or certified in their jurisdiction.

NOTE

• The outdoor unit should be positioned where the unit and power supply wires (breaker panel to outdoor unit) are at least 10ft (3m) away from any televisions or radios. (The unit may cause interference with the picture or sound.) Depending on the radio waves, a distance of 10ft (3m) may not be sufficient to eliminate the noise.
• Dismantling the unit, treatment of the refrigerant, oil and additional parts must be done in accordance with the relevant local, state, and national regulations.
• Only use tools for R32 or R410A, such as a gauge manifold, charge hose, gas leak detector, reverse flow check valve, refrigerant charge base, vacuum gauge, or refrigerant recovery equipment.
• If the conventional refrigerant and refrigerator oil are mixed in R32, the refrigerant may deteriorate.
• As maximum allowable pressure is 604psi (4.17MPa), the wall thickness of field-installed pipes should be selected in accordance with the relevant local, state, and national regulations. RN004(R32)-U

Accessories

Precautions for Selecting a Location

1. Choose a place solid enough to bear the weight and vibration of the unit, where the operating sound will not be amplified.

2. Choose a location where the air discharged from the unit or the operating sound will not cause a nuisance to the neighbours of the user.

3. Avoid locations, such as near bedrooms, where the operating sound may cause disturbance.

4. There must be sufficient space to carry the unit into and out of the site.

5. There must be sufficient space for air passage and no obstructions around the air inlet and the air outlet.

6. The site must not be prone to flammable gas leaks in the surrounding area.

7. In coastal areas or other places with a salty atmosphere or one containing sulphate gas, corrosion may shorten the life of the air
   conditioner.

8. Since water will flow from the drain of the outdoor unit, do not place anything under the unit which must be kept away from
   moisture.

NOTE Cannot be installed suspended from a ceiling or stacked.

CAUTION
When operating the air conditioner in a low outdoor ambient temperature, be sure to follow the instructions described below.

• To prevent exposure to wind, install the outdoor unit with its suction side facing the wall.
• Never install the outdoor unit at a site where the suction side may be exposed directly to wind.
• To prevent exposure to wind, it is recommended to install a baffle plate on the air discharge side of the outdoor unit.
• In heavy snow areas, select an installation site where the snow will not affect the unit.
• If there is a likelihood of snow accumulating on the outdoor unit, attach a snow protection hood.
• In high humidity areas or heavy snow areas, it is recommended to attach a drain pan heater to prevent ice build-up from the bottom frame.

Precautions on Installation

• Check the strength and level of the installation surface so that the unit does not cause any operating vibrations or noise after installation.
• Fix the unit in place securely using foundation bolts, as in the figure. (Prepare 4 sets of 5/16 inch (M8) or 3/8 inch (M10) foundation bolts, nuts and washers; all sold separately.)
• It is best to screw in the foundation bolts until their ends are 3/4 inch (20mm) from the foundation surface.

Outdoor Unit Installation Diagram

Installation Space Requirements

• Position the unit on a horizontal surface. Any tilt in the unit should be 3° or less to the horizontal.
• Where a wall or other obstacle is in the path of the outdoor unit’s intake or exhaust airflow, follow the installation space requirements below.
• For any of the below installation patterns, the wall height on the outlet side should be 47-1/4 inch (1200mm) or less.

Outdoor Unit Installation

1. Installing the outdoor unit

• When installing the outdoor unit, refer to “Precautions for Selecting a Location” and the “Outdoor Unit Installation Diagram”.
• If drain work is necessary, follow the procedures in “2. Drain work”.

2. Drain work

CAUTION

• In cold areas, do not use a drain socket, drain caps (1, 2) and a drain hose with the outdoor unit. (Drain water may freeze, impairing heating performance.)
• If the drain port is covered by a mounting base or floor surface, place additional foot bases of at least 1-1/4 inch (30mm) in height under the outdoor unit’s feet.

1. Attach B drain cap (1) and C drain cap (2).
2. Attach A drain socket.

• When attaching A drain socket to the bottom frame, make sure to connect the drain hose to the drain socket first.

3. Flaring the pipe end

WARNING

• Do not apply mineral oil to the flare.
• Prevent mineral oil from getting into the system as this would reduce the service life of the units.
• Never use piping which has been used for previous installations. Only use parts which are delivered with this unit.
• Never install a dryer to this R32 unit in order to guarantee its service life.
• The drying material may dissolve and damage the system.
• Improper flaring may result in refrigerant gas leakage.

CAUTION

• Do not reuse joints which have been used once already.

1. Cut the pipe end with a pipe cutter.
2. Remove burrs with the cut surface facing downward, so that the filings do not enter the pipe.
3. Put the flare nut on the pipe.
4. Flare the pipe.
5. Check that the flaring has been done correctly.

4. Refrigerant piping

CAUTION

• Use the flare nut fixed to the main unit. (This is to prevent the flare nut from cracking as a result of deterioration over time.)
• To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R32 or R410A.)
• Use a torque wrench when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.
• Align the centres of both flares and tighten the flare nuts 3 or 4 turns by hand, then tighten them fully with a spanner and a torque wrench.

Cautions on pipe handling

• Protect the open end of the pipe from dust and moisture.
• All pipe bends should be as gentle as possible. Use a pipe bender for bending. Rain

Selection of copper and heat insulation materials
When using commercial copper pipes and fittings, observe the following:

• Insulation material: Polyethylene foam Heat transfer rate: 0.041 to 0.052W/mK (0.024 to 0.030Btu/fth °F (0.035 to 0.045kcal/mh°C)) Be sure to use insulation that is designed for use with HVAC Systems.
• ACR Copper only.
• Be sure to insulate both the gas and liquid piping and observe the insulation dimensions as below.

5. Pressure test and evacuating system

WARNING

• Make sure that air or any matter other than refrigerant (R32) does not get into the refrigeration cycle.
• If refrigerant gas leaks should occur, ventilate the room as soon and as much as possible.
• R32, as well as other refrigerants, should always be recovered and never be released directly into the environment.
• Use tools for R32 or R410A (such as the gauge manifold, charging hose, or vacuum pump adapter).

CAUTION

• It is highly recommended that you do not open/close the stop valves when the outdoor temperature is below -5°F (-21°C) as this may result in refrigerant leakage.
• When piping work is complete, it is necessary to perform a pressure test and evacuate system with a vacuum pump.
• If using additional refrigerant, purge the air from the refrigerant pipes and indoor unit using a vacuum pump, then charge additional refrigerant.
• Use a hexagonal wrench (3/16 inch (4mm)) to operate the stop valve rod.
• All refrigerant pipe joints should be tightened with a torque wrench to the specified tightening torque.

1. Pressurize the liquid pipe and gas pipe from the service ports of each stop valve to 604psi (4.17MPa) (do not pressurize more than 604psi (4.17MPa)) for 1 hour minimum, 24 hours recommended. If there is a pressure drop, check for leaks, make repairs and perform the pressure test again.
2. Connect the gauge manifold’s charging hose to the gas stop valve’s service port.
3. Fully open the low-pressure valve (Lo) on the gauge manifold and fully close the high-pressure valve (Hi). (High-pressure valve will require no further operation.)
4. Evacuate system using vacuum pump to below 500 microns for 1 hour minimum.
5. Close the low-pressure valve (Lo) on the gauge manifold and stop vacuum pumping. (Maintain this condition for a few minutes to make sure that the compound pressure gauge pointer does not swing back.)*1
6. Remove the valve caps from the liquid stop valve and gas stop valve.
7. To open the liquid stop valve, turn the rod of the valve 90° counter-clockwise using a hexagonal wrench. Close it after 5 seconds, and check for gas leakage. Using soapy water, check for gas leakage from the indoor unit’s flare and outdoor unit’s flare and valve rods. After the check is complete, wipe all soapy water off.*2
8. Disconnect the charging hoses from the service port for the gas stop valve, then fully open the liquid and gas stop valves. (Do not attempt to turn the valve rods further than they can go.)
9. Tighten the valve caps and service port caps for the liquid and gas stop valves with a torque wrench to the specified torques. Refer to “4. Refrigerant piping” on page 6 for details.
   1 If the compound pressure gauge pointer swings back, the refrigerant may have water content or there may be a loose pipe joint. Check all pipe joints and retighten nuts as needed, then repeat steps 3) through 5).
   2 Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall not be used. Do not use substances containing chlorine and electronic leak detection for gas leak detection.

Wiring

WARNING

• Do not use tapped wires, extension cords, or starburst connections, as they may cause overheating, electric shock, or fire.
• Do not use locally purchased electrical parts inside the product. (Do not branch the power for the drain pump, etc., from the terminal block.) Doing so may cause electric shock or fire.
• The circuit must be protected with safety devices in accordance with local and national codes, i.e. a circuit breaker.
• Use an all-pole disconnection type circuit breaker with at least 1/8 inch (3mm) between the contact point gaps.
• When carrying out wiring, take care not to pull at the conduit.
• Do not connect the power wire to the indoor unit. Doing so may cause electric shock or fire.

CAUTION
Precautions to be taken for power supply wiring

• When connecting the inter-unit wires to the terminal block using a single core wire, be sure to curl the end of the lead.
  Improper work may cause heat and fire.

• Do not turn on the circuit breaker until all work is completed.

1. Strip the insulation from the wire (3/4 inch (20mm)).
2. Connect the inter-unit wires between the indoor and outdoor units so that the terminal numbers match. Tighten the terminal screws securely. It is recommended that a slot-head screwdriver be used to tighten the screws.

NOTE Take care to ensure that all wiring between indoor unit and outdoor unit has a consistent connection. Any splices can cause communication errors.

[Method of mounting conduit]

1. Dismount the service lid by removing the 2 screws.
2. Pass wires through the conduit and secure them with a lock nut.
3. After completing the work, reattach the service lid to its original position.

Facility Setting (cooling at low outdoor temperature)

WARNING

• Make sure to turn the power OFF before removing the service lid.

CAUTION

• If the outdoor unit is installed where the heat exchanger of the unit is exposed to direct wind, provide a windbreak wall.

• Intermittent noises may be produced by the indoor unit due to the outdoor fan turning on and off when using facility settings.

• Do not place humidifiers or other items which might raise the humidity in rooms where facility settings are being used.
  A humidifier might cause dew condensation from the indoor unit outlet vent.

• Activating the facility setting sets the indoor fan tap to the highest position.
  Notify the user about this.

This function is designed for facilities such as equipment or computer rooms. It is never to be used in a residence or office where people occupy the space.

1. Turning on SW5-3 on the PCB will extend the operation range to 14°F (­10°C).
   Installing an air direction adjustment grille (sold separately) will further extend the operation range to ­4°F (­20°C). In these cases, the unit will stop operating if the outdoor temperature falls below ­4°F (­20°C), restarting once the temperature rises above this level.

When attaching the drain pan heater

In high humidity areas or heavy snow areas, it is recommended to attach a drain pan heater to prevent ice build-up from the bottom frame.

1. Attach the drain pan heater in accordance with the installation manual included with the drain pan heater.
2. Dismount the service lid by removing the 2 screws.
3. Remove the switch cover (1 screw).
4. Turn on SW6-1 on the PCB.

Pump Down Operation

In order to protect the environment, be sure to pump down when relocating or disposing of the unit.

1. Remove the valve cap from the liquid stop valve and gas stop valve.
2. Begin forced cooling operation.
3. After 5 to 10 minutes, close the liquid stop valve with a hexagonal wrench.
4. After 2 to 3 minutes, close the gas stop valve and stop forced cooling operation.
5. Attach the valve cap once procedures are complete.

Forced cooling operation
Using the indoor unit ON/OFF switch Press the indoor unit ON/OFF switch for at least 5 seconds. (The operation will start.)

• Forced cooling operation will stop automatically after about 15 minutes. To stop the operation, press the indoor unit ON/OFF switch.

Using the indoor unit’s remote controller

Trial Operation and Testing

• When trial operation is conducted directly after the circuit breaker is turned on, in some cases no air will be output for about 15 minutes in order to protect the air conditioner.

1. Trial operation and testing

Refer to the installation manual for the indoor unit.

2. Test items

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