DAIKIN 2MXM18AVJU9 Room Air Conditioner Installation Guide

Installation Guide for DAIKIN models including: 2MXM18AVJU9, 3MXM24AVJU9, 4MXM36AVJU9, 2MXT18AVJU9, 2MXTH18AVJU9, 2MXM18AVJU9 Room Air Conditioner, 2MXM18AVJU9, Room Air Conditioner, Air Conditioner, Conditioner

00 CV 3P740830-1B

INSTALLATION MANUAL

15 hours ago — When operating the air conditioner in a low outdoor ambient temperature, be sure to follow the instructions described below. • To prevent exposure to wind, ...

7 hours ago — When operating the air conditioner in a low outdoor ambient temperature, be sure to follow the instructions described below. • To prevent exposure to wind, ...

File Info : application/pdf, 22 Pages, 3.88MB

435699 dai2mxm18avju9 234mxm 2mxt 2mxth-installation-2023

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DAIKIN ROOM AIR CONDITIONER
INSTALLATION MANUAL
R32 Split Series
Installation manual Manuel dinstallation Manual de instalación
MODELS
2MXM18AVJU9 3MXM24AVJU9 4MXM36AVJU9 2MXT18AVJU9 2MXTH18AVJU9

Contents

Safety Considerations .................................... 1 Accessories ..................................................... 3 Precautions for Selecting a Location ........... 3 Precautions on Installation ............................ 4 Outdoor Unit Installation Diagram ................ 4 Installation Space Requirements .................. 5 Selecting a Location for Installation of the Indoor Units ..................................................... 6 Connections (connection port) ..................... 7 How to Use Reducers ..................................... 8 Outdoor Unit Installation ................................ 9
1. Installing the outdoor unit ............................................ 9 2. Drain work ................................................................... 9 3. Flaring the pipe end..................................................... 9

4. Refrigerant piping ........................................................ 10 5. Pressure test and evacuating system.......................... 11 6. Charging with refrigerant ............................................. 12
Wiring ............................................................... 13 Priority Room Setting ..................................... 16 Night Quiet Mode setting ............................... 17 COOL/HEAT mode lock [X161A] .................... 17 When attaching the optional drain pan heater (excluding 2MXTH models) ............................ 18 Pump Down Operation ................................... 18 Trial Operation and Testing ............................ 19
1. Wiring error check ....................................................... 19 2. Trial operation and testing ........................................... 20 3. Test items .................................................................... 20
The pictures in this document are for illustrative purposes only.

Safety Considerations

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

Read the precautions in this manual carefully before operating the unit.

Refrigerant Safety Group

This appliance is filled with R32.

A2L

Read these Safety Considerations for Installation carefully before installing an air conditioner or heat pump. After completing the installation, make sure that the unit operates properly during the startup operation. Instruct the user on how to operate and maintain the unit. Inform users that they should store this installation manual with the operation manual for future reference. Always use a licensed installer or contractor to install this product. Improper installation can result in water or refrigerant leakage, electric shock, fire, or explosion. Meanings of DANGER, WARNING, CAUTION, and NOTE Symbols:
DANGER ........... Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
WARNING ......... Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION .......... Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. It may also be used to alert against unsafe practices.
NOTE ................ Indicates situations that may result in equipment or property damage accidents only.
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 injury or death by suffocation.
· All possible ignition sources, including cigarette smoking, should be kept sufficiently far away from the site of installation, repairing, removing and disposal.
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 including piping material, pipe routing, and installation shall include protection from physical damage in operation and service, and be in compliance with national and local codes and standards, such as ASHRAE 15, ASHRAE 15.2, IAPMO Uniform Mechanical Code, ICC International Mechanical Code, or CSA B52. All field joints shall be accessible for inspection prior to being covered or enclosed.
· 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.
English

· 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 injury.
· 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 service lid can be securely fastened. Improper positioning of the service lid 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 service lid. If the service lid 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, which may result in equipment damage and even 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.
· 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.
· The indoor equipment and pipes shall be securely mounted and guarded such that accidental rupture of equipment cannot occur from such events as moving furniture or reconstruction activities.
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.
English

· 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.
· Indoor units are for indoor installation only. Outdoor units can be installed either outdoors or indoors.
· 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 sulfurous 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. RN007(R32)-U
2

English

Accessories

A Installation manual C Drain cap (1)

B Drain socket

This is at the bottom of the packaging.

D Drain cap (2)

E Reducer assy

1 F Warranty

G Refrigerant charge

label

1 1+2=

1 H General Safety Considerations

Affix near the machine nameplate.

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 neighbors 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) In coastal areas or other places with salty atmosphere or one containing sulfate gas, corrosion may shorten the life of the air conditioner.
7) 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.
8) A location where flammable gas does not leak. Position at least 6-5/8ft (2m) from propane gas cylinders.

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.

· Construct a large canopy. · Construct a pedestal.
Install the unit high enough off the ground to prevent burying in snow.

English

3/4" (20mm)
English

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
CAUTION
· Do not connect the embedded branch piping and the outdoor unit when only carrying out piping work without connecting the indoor unit in order to add another indoor unit later. Make sure no dirt or moisture gets into either side of the embedded branch piping. Refer to "4. Refrigerant piping" on page 10 for details.
· It is not possible to have only 1 indoor unit connected. Be sure to connect at least 2 indoor units.

If strong wind blows into the air discharge side from the front and there is a danger that the fan may be damaged, change the orientation of the air discharge side of the outdoor unit or use an air direction adjustment grille (sold separately).
If there is a danger of the unit falling or overturning, fix the unit with foundation bolts, or with wire or other means.

Allow 11-13/16" (300mm) of work space below the ceiling surface.
Top plate

Refrigerant piping must be protected from physical damage. Install a plastic cover or equivalent.

Wrap the insulation pipe with finishing tape from bottom to top.

9-13/16 (250) from wall

Allow space for piping and electrical servicing.
Service lid

In sites with poor drainage, use block bases for the outdoor unit. Adjust foot height until the unit is level. Otherwise, water leakage or pooling of water may occur.

unit : inch (mm)

(Foot bolt-2h3o-l5e/8ce(6n0te0)rs)

(Fr4o-m15u/1n6it's(1s2id5e) )

Appearance of outdoor units may differ from some models.

(F1oc3oe-5tn/bt8eo(rl3st-4)h6o)le
Level mounting base (available separately)

Manufacturer's label Stop valve cover

Also insulate the connection on the outdoor unit.

Clamping material

Tape

Insulation tube Stop valve cover

Use tape or insulating material on all connections to prevent air from getting in between the copper piping and the insulation tube. Be sure to do this if the outdoor unit is installed at a higher elevation than any of the indoor units connected to it.

Refrigerant charge label
Please fill in with indelible ink, 1 the factory refrigerant charge of the product, 2 the additional refrigerant amount charged in the field and 1 + 2 the total refrigerant charge on the refrigerant charge label supplied with the product. Affix the refrigerant charge label near the manufacturer's label after filling it out.
English

2 1

1= 2= 1+2=

1 factory refrigerant charge of the

product: see unit manufacturer's

label 1

2 additional refrigerant amount

charged in the field

3 total refrigerant charge

4 outdoor unit

5 refrigerant cylinder and manifold for charging

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. · Secure as much installation space around the unit as the location allows, as more space will result in more efficient operation.

Wall facing one side

More than 3-15/16 (100)

More than 13-3/4 (350)

47-1/4 (1200) or less

Side view

Walls facing two sides

More than 1-15/16 (50)

More than 3-15/16 (100)

More than 3-15/16 (100)
More than 13-3/4 (350)

More than 13-3/4 (350)

Top view

More than 1-15/16 (50)

Walls facing three sides

More than 1-15/16 (50)

More than 3-15/16 (100) More than 13-3/4 (350)

When installed as in the figure on the left, it is recommended to either change the orientation of the outdoor unit outlet side or use the air direction adjustment grille (sold separately).

Top view

unit: inch (mm)

English

Selecting a Location for Installation of the Indoor Units

Minimum required floor area The minimum required floor

a(Aremain)of

the

room

where

the

indoor

unit

installed

varies

depending

the

installation

height and refrigerant amount.

Indoor unit installation

h (m)

height (m) Refrigerant amount (kg)

0.6

1.8

2.0

2.2

2.4

2.6

< 1.84

No restriction

1.9

31.0

6.9

6.2

5.6

5.2

4.8

2.0

34.3

7.3

6.5

5.9

5.4

5.0

2.1

37.8

7.6

6.9

6.2

5.7

5.3

2.2

41.5

8.0

7.2

6.5

6.0

5.5

2.3

45.4

8.4

7.5

6.8

6.3

5.8

2.4

49.4

8.7

7.8

7.1

6.5

6.0

2.5

53.6

9.1

8.2

7.4

6.8

6.3

2.6

58.0

9.4

8.5

7.7

7.1

6.5

2.7

62.6

9.8

8.8

8.0

7.4

6.8

2.8

67.3 10.2

9.2

8.3

7.6

7.0

2.9

72.2 10.5

9.5

8.6

7.9

7.3

3.0

77.2 10.9

9.8

8.9

8.2

7.5

3.1

82.5 11.3 10.1

9.2

8.4

7.8

3.2

87.9 11.6 10.5

9.5

8.7

8.0

3.3

93.4 12.0 10.8

9.8

9.0

8.3

3.4

99.2 12.3 11.1 10.1

9.3

8.5

3.5

105.1 12.7 11.4 10.4

9.5

8.8

3.6

111.2 13.1 11.8 10.7

9.8

9.0

3.7

117.5 13.4 12.1 11.0 10.1

9.3

3.8

123.9 13.8 12.4 11.3 10.3

9.6

3.9

130.5 14.5 12.7 11.6 10.6

9.8

4.0

137.3 15.3 13.1 11.9 10.9 10.1

4.1

144.2 16.0 13.4 12.2 11.2 10.3

4.2

151.4 16.8 13.7 12.5 11.4 10.6

4.3

158.7 17.6 14.3 12.8 11.7 10.8

4.4

166.1 18.5 15.0 13.1 12.0 11.1

180.0 160.0 140.0 120.0 100.0
80.0

No restrictions on floor area / installation height where the indoor unit is installed

60.0

40.0

20.0

h= 0.6 m

0.0

20.0

18.0

16.0

14.0

12.0

10.0

8.0

6.0

4.0

h= 1.8 m

h= 2.0 m

2.0

h= 2.2 m

0.0 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4

Refrigerant amount (kg)

Indoor unit installation

h (ft)

height (ft) Refrigerant amount (lb)

2.0

5.9

6.6

7.2

7.9

8.5

< 4.05

No restriction

4.2

333

4.4

369

4.6

407

4.9

447

5.1

489

5.3

532

5.5

577

5.7

624

102

6.0

673

106

6.2

724

109

6.4

777

113

102

6.6

831

117

106

6.8

888

121

109

7.1

946

125

113

102

7.3

1006 129

116

106

7.5

1068 133

120

109

100

7.7

1131 137

123

112

103

7.9

1197 141

127

115

106

8.2

1264 145

130

118

108

100

8.4

1334 149

134

122

111

103

8.6

1405 156

137

125

114

106

8.8

1478 164

141

128

117

108

9.0

1553 173

144

131

120

111

9.3

1629 181

148

134

123

114

9.5

1708 190

154

138

126

116

9.7

1788 199

161

141

129

119

1800
1600 No restrictions on floor area /
1400 installation 1200 height where the 1000 indoor unit is
installed
800

600

400

200

h= 2.0 ft

200

180

160

140

120

100

h= 5.9 ft

h= 6.6 ft

h= 7.2 ft

0 1.7 2.1 2.5 2.9 3.3 3.7 4.1 4.5 4.9 5.3 5.7 6.1 6.5 6.9 7.3 7.7 8.1 8.5 8.9 9.3 9.7

Refrigerant amount (lb)

lb = kg* 2.2046 ft2= m2* 10.764

Minimum required floor area (m2) Minimum required floor area (ft2)

English

Selecting a Location for Installation of the Indoor Units

· The maximum allowable length of refrigerant piping, and the maximum allowable height difference between the outdoor and indoor units, are listed below.
· Refrigerant piping must be kept to a minimum. The suggested shortest pipe length per room is 10ft (3m), in order to avoid noise from the outdoor unit and vibration. (Mechanical noise and vibration may occur depending on how the unit is installed and the environment in which it is used.)

Outdoor unit capacity class Piping to each indoor unit Total length of piping between all units

2MXM, 2MXT

3MXM, 4MXM

82ft (25m) max. 10ft (3m) min.

164ft (50m) max.

230ft (70m) max.

Indoor unit

Level difference: 49-1/4ft (15m) max.

Level difference: 24-5/8ft (7.5m) max.

Outdoor unit

Level difference: 49-1/4ft (15m) max.

Level difference: 24-5/8ft (7.5m) max.

Indoor unit

Outdoor unit

If the outdoor unit is positioned higher than the indoor units.

If the outdoor unit is positioned lower than one or more indoor units.

Connections (connection port)

Install the indoor unit according to the table below, which shows the relationship between the class of indoor unit and the
corresponding port.
The total indoor unit class that can be connected to this unit: 2MXM, 2MXT Up to 24000 Btu/h 3MXM Up to 39000 Btu/h 4MXM Up to 48000 Btu/h
The line set piping size is determined by the size of the indoor unit fittings.
Reducers are used at the outdoor unit to accommodate the correct gas line pipe size.

Port

2MXM, 2MXT

A 07 , 09 , 12

###
B 07 , 09 , 12 , 15

3MXM
07 , 09 , 12
###
07 , 09 , 12 , 15 , 18
###
07 , 09 , 12 , 15 , 18

4MXM
07 , 09 , 12
###
07 , 09 , 12 , 15 , 18
###
07 , 09 , 12 , 15 , 18

07 , 09 , 12 , 15 , 18 , 24

: Use a reducer to connect pipes. : Use No. 1 and 3 reducers. # : Use No. 2 and 4 reducers. : Use No. 5 and 6 reducers.
Refer to "How to Use Reducers" on page 8 for information on reducer numbers and their shapes.

English

How to Use Reducers

No.1
5/8" 1/2"

No.2
1/2" 3/8"

No.3
5/8" 1/2"

No.4
1/2" 3/8"

No.5
5/8" 3/8"

No.6
5/8" 3/8"

Gasket (1)

Gasket (2)

Reduce and gasket

· Use the reducers supplied with the unit as described below. (1) Connecting a pipe of 1/2 inch (12.7mm) to a gas pipe connection port for 5/8 inch (15.9mm) :

No. 1
Be sure to attach the gasket.

No. 3

Connection port of outdoor unit

Inter-unit piping Flare nut (for 5/8 inch (15.9mm))

(2) Connecting a pipe of 3/8 inch (9.5mm) to a gas pipe connection port for 1/2 inch (12.7mm) :

No. 2

No. 4

Be sure to attach the gasket. Connection port of outdoor unit

Flare nut (for 1/2 inch (12.7mm))

(3) Connecting a pipe of 3/8 inch (9.5mm) to a gas pipe connection port for 5/8 inch (15.9mm) :

No. 6 No. 5 Be sure to attach the gasket.
Connection port of outdoor unit

Flare nut (for 3/8 inch (9.5mm))

· When using the reducer packing shown above, be careful not to overtighten the nut, or the smaller pipe may become damaged. (Apply about 2/3 to 3/3 the normal torque.)
· Apply a coat of refrigeration oil to the threaded connection port of the outdoor unit where the flare nut comes in. · Use an appropriate wrench to avoid damaging the connection thread by overtightening the flare nut.

Flare nut tightening torque

3/8 inch (9.5mm)

24-1/8 29-1/2Ibf · ft (32.7-39.9N · m)

1/2 inch (12.7mm)

36-1/2 44-1/2Ibf · ft (49.5-60.3N · m)

5/8 inch (15.9mm)

45-5/8 55-5/8Ibf · ft (61.8-75.4N · m)

English

Outdoor Unit Installation

1. Installing the outdoor unit
1) When installing the outdoor unit, refer to "Precautions for Selecting a Location" on page 3 and the "Outdoor Unit Installation Diagram" on page 4.
2) If drain work is necessary, follow the procedures below.
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 C drain cap (1) and D drain cap (2). 2) Attach B drain socket to the shape of drain hole and
fix it by turning. · When attaching B drain socket to the bottom
frame, make sure to connect the drain hose to the drain socket first.

C Drain cap (1) D Drain cap (2)

B Drain socket

Air outlet side

D Drain cap (2)

Bottom frame Drain cap
Pinch the bottom frame in.

Drain hole

Bottom frame

Turn to fix.

B Drain socket

Hose (available commercially, inner dia. 5/8" (16mm))

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.

Cut exactly at right angles.

Remove burrs.

The flare's inner surface must be flaw-free.
When flaring, do not over-tighten and crack.

Check
The pipe end must be evenly flared in a perfect circle.
Make sure that the flare nut is fitted.

Set exactly at the position shown below.

Flaring

Flare tool

for R32 or R410A

Conventional flare tool

Clutch-type

Clutch-type (Rigid-type) Wing-nut type (Imperial-type)

Die A

0-0.020 inch (0-0.5mm)

0.039-0.059 inch (1.0-1.5mm)

0.059-0.079 inch (1.5-2.0mm)

English

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 centers 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.

Apply oil Do not apply refrigeration oil to the outer surface.
Flare nut

Apply refrigeration
oil only to the inner surface of the flare.

Tighten Torque wrench
Spanner

Do not apply refrigeration oil to the flare nut to avoid tightening with excessive torque.

Piping union Flare nut

Tightening torque Piping connection
Flare nut Gas side 3/8 inch (9.5mm) 1/2 inch (12.7mm) 5/8 inch (15.9mm) 24-1/8 29-1/2lbf · ft 36-1/2 44-1/2lbf · ft 45-5/8 55-5/8lbf · ft (32.7-39.9N · m) (49.5-60.3N · m) (61.8-75.4N · m)

Liquid side 1/4 inch (6.4mm) 10-1/2 12-3/4lbf · ft (14.2-17.2N · m)

Valve cap Width across flats
3/4 inch (19mm) 7/8 inch (22mm) 12-5/8 15-3/8lbf · ft 16 20-1/4lbf · ft
(17.0-20.9N · m) (21.6-27.4N · m)

Service port cap 8 10-7/8lbf · ft (10.7-14.7N · m)

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

Be sure to place a cap. If no flare cap is available, cover the flare mouth with tape to keep dirt and water out.

Wall

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

Gas pipe

Liquid pipe

· 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.

Gas pipe insulation

Liquid pipe insulation

· Be sure to insulate both the gas and liquid piping and observe the insulation dimensions as below.

Finishing tape

Drain hose

Gas side Liquid side

Piping size
O.D. 3/8 inch (9.5mm)
O.D. 1/2 inch (12.7mm)
O.D. 5/8 inch (15.9mm)
O.D. 1/4 inch (6.4mm)

Minimum bend radius

Piping thickness

Thermal insulation size

Thermal insulation thickness

1-3/16 inch (30mm) or more
1-9/16 inch (40mm) or more

0.031 inch (0.8mm) (C1220T-O)

1-15/16 inch (50mm) 0.039 inch (1.0mm)

or more

(C1220T-O)

I.D. 15/32-19/32 inch (12-15mm)
I.D. 9/16-5/8 inch (14-16mm)
I.D. 5/8-13/16 inch (16-20mm)

13/32 inch (10mm) Min.

1-3/16 inch (30mm) 0.031 inch (0.8mm) I.D. 5/16-13/32 inch

or more

(C1220T-O)

(8-10mm)

· Use separate thermal insulation pipes for gas and liquid refrigerant pipes. · Using finishing tape, bundle and wrap the indoor unit piping and drain hose together so that the drain hose is below the
other piping.

English

Outdoor Unit Installation
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

Compound pressure gauge

Pressure meter

High-pressure valve

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

Gauge manifold

specified tightening torque.
Gas

Low-pressure valve

stop valve

Charging hoses

Valve caps

Liquid stop valve

Vacuum pump

Service port

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 hoses to the service ports of each stop valve.
3) Fully open the low-pressure valve (Lo) and the high-pressure valve (Hi) on the gauge manifold. 4) Evacuate system using vacuum pump to below 500 microns for 1 hour minimum.
5) Close the low-pressure valve (Lo) and the high-pressure valve (Hi) on the gauge manifold and stop vacuum pump. (Maintain this condition for 4-5 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 ports, 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 10 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.

English

6. Charging with refrigerant

CAUTION
Even though the stop valve is fully closed, the refrigerant may slowly leak out; do not leave the flare nut removed for a long
period of time.

· If the total length of piping for all rooms exceeds the table listed below, additionally charge with 0.22oz/ft (20g/m) of refrigerant (R32) for each additional piping length. Be sure to add the proper amount of additional refrigerant. Failure to do so may result in reduced performance.

Outdoor unit capacity class Total length of piping for all rooms

2MXM, 2MXT 98-3/8ft (30m)

3MXM, 4MXM 131-1/4ft (40m)

English

Wiring

WARNING
· RISK OF ELECTRIC SHOCK CAUSE INJURY OR DEATH. System contains oversize protective earthing (grounding) terminal which shall be properly connected.
· 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.
· 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.
· Do not turn on the circuit breaker until all work is completed.

CAUTION
Precautions to be taken for power supply wiring Recommend stranded cable for interunit wiring. Local code always supersedes recommendation.

· For stranded wires, make sure to use the round crimp-style terminal for connection to the power supply terminal block. Place the round crimpstyle terminals on the wires up to the covered part and secure in place.

Round crimp-style terminal

Screw

Flat washer
A

Screw
Round crimp-style terminal

Screw Flat washer

Stranded wire

Round crimp-style terminal

Good

Flat washer

Wrong

Arrow view A

Round crimp-style terminal

· If solid core wire must be used, be sure to curl the end of the lead. Improper work may cause heat and fire.

Good

Wrong

Stripping wire at terminal block

Strip wire end to this point.
Good

Excessive strip length may cause electric shock or current leakage.
Wrong

English

[Method of Mounting Conduit] · When wiring, remove the top plate and look at the wiring diagram on the back of the top plate. · When connecting indoor units for 3 rooms or more, open knockout holes without deforming the conduit mounting plate. 1) Dismount the service lid by removing the 2 screws. 2) Slide the protection plate up and remove it. 3) Pass wires through the conduit and secure them with a lock nut.
Wiring diagram

Top plate

Conduit

Lock nut

Knockout holes Conduit mounting plate

Protection plate
Conduit mounting plate Service lid

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Wiring

[Wiring procedure]

Outdoor unit

1) Strip the insulation from the wire (3/4inch (20mm)). 2) Connect the inter-unit wires between the indoor and

Room C

Room power supply A

outdoor units so that the terminal numbers match. Tighten the terminal screws securely. It is recommended

Room D

Room B

that a slot-head screwdriver be used to tighten the screws. 3) Be sure to match the symbols for wiring and piping. 4) Pull the wire lightly to make sure that it does not disconnect. 5) Pass the wiring through the cutout on the bottom of the

Indoor unit Room A

Follow local codes for wiring and safety devices between outdoor unit and power source.

60Hz 208/230V

To room B

To room C Ground To room D

For the ground wire, use AWG10, stranded and insulated wire.

protection plate and attach the protection plate. 6) After completing the work, reattach the service lid to its
original position.

Note

Recommend using AWG14, stranded and insulated wire for connections between indoor and outdoor units. Local code always supersedes recommendation.

Take care to ensure that all wiring between indoor unit and outdoor unit

has a consistent connection. Any splices can cause communication errors.

· 2MXM, 2MXT models
For Room A For Room B For power supply

· 3MXM models
For Room C For Room A

For Room B

For power supply

12 3

Use the specified wires and connect them securely.

12 3

Shape the wires so that there is no lifting of the protection plate or other structural parts.
· 4MXM models
For Room D For Room C For Room A For Room B For power supply

12 3

Ground This air conditioner must be grounded. For grounding, follow all local, and state electrical codes.

English

Priority Room Setting
· To use priority room setting, initial settings must be made when the unit is installed. Explain the priority room setting, as described below, to the user, and confirm whether or not the user wants to use priority room setting. Setting it in the guest and living rooms is convenient.
About the priority room setting function
The indoor unit for which priority room setting is applied takes priority in the following cases.
1) Operation mode priority
The operation mode of the indoor unit which is set for priority room setting takes priority. If the set indoor unit is operating, all other indoor units do not operate and enter standby mode, according to the operation mode of the set indoor unit.
2) Priority during powerful operation
If the indoor unit which is set for priority room setting is operating at powerful, the capabilities of other indoor units will be somewhat reduced. Power supply gives priority to the indoor unit which is set for priority room setting.
3) Quiet operation priority
Setting the indoor unit to quiet operation will make the outdoor unit run quietly.
Setting procedure
Slide the priority room setting switch (SW4) to the on side for the switch that corresponds to the piping connected to the indoor unit to be set. (In the figure below, it is room A.) Once the settings are complete, switch the power on.
Be sure to set only one room

12 3

Service PC-board

E D2 COOCB431L A2 1

Remove the switch cover
Screw

E D C B A
2 1
4 3 2 1
COOL HEAT

Priority room setting switch (SW4)

OFF

D C B A

English

Night Quiet Mode setting

· If night quiet mode is to be used, initial settings must be made when the unit is installed. Explain night quiet mode, as described below, to the user, and confirm whether or not the user wants to use night quiet mode.
About night quiet mode
The night quiet mode function reduces operating noise of the outdoor unit at nighttime. This function is useful if the user is worried about the effects of the operating noise on the neighbors. However, cooling capacity will be reduced when operating in night quiet mode.
Service PC-board

Setting procedure
Turn the night quiet mode switch (SW6-1) to on.

E D2 COOCB431L A2 1

Remove the switch cover
Screw

E D C B A
2 1
4 3 2 1
COOL HEAT

Night quiet mode setting switch (SW6-1)

OFF

COOL/HEAT mode lock [X161A]

· Use the X161A connector to set the unit to only cool or heat.
Setting to only heat (H) : short-circuit pins 1 and 3 of the connector [X161A]
Setting to only cool (C) : short-circuit pins 3 and 5 of the connector [X161A] The following specifications apply to the connector housing and pins.
JST products Housing: VHR-5N
Pin: SVH-21T-P1.1 Note that forced operation is also possible in COOL/HEAT mode.

HEAT mode (H) COOL mode (C)

English

When attaching the optional drain pan heater (excluding 2MXTH models)

WARNING
Do not remove the switch cover unless the power has been turned off. (Risk of electric shock)
1) Attach the drain pan heater in accordance with the installation manual included with the drain pan heater.
2) Using a tool such as nippers, cut the jumper (J_DP) on the service PC-board.

Service PC-board

E D2 COOCB431L A2 1

Remove the switch cover
Screw

Jumper (J_DP)

E D C B A
2 1
4 3 2 1
COOL HEAT

Pump Down Operation

WARNING
Do not remove the switch cover unless the power has been turned off. (Risk of electric shock)

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

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

Gas stop valve

Hexagonal wrench

Liquid stop valve

Valve caps

Forced cooling operation
· When using this outdoor unit, no need to operate the indoor unit.

1) Turn off the power.
2) Remove the service lid (2 screws).
3) Remove the service PC-board switch cover (1 screw).
4) Switch SW5 and SW6 to off.
5) Turn the operation mode switch (SW2) to COOL.
6) Screw the service PC-board switch cover back on (1 screw).
7) Turn on the power. 8) Push the forced operation switch (SW1)
above the service PC-board cover. (The operation will start.)
· Forced cooling operation will stop automatically after about 11 to 15 minutes. To stop the operation, push the forced operation switch (SW1).

Service PC-board

E D2 COOCB431L A2 1

Remove the switch cover
Screw

E D C B A
2 1
4 3 2 1
COOL HEAT

·Switch SW5 and SW6 to off.

OFF

2 SW6
1

OFF

3
SW5 2

Operation mode switch (SW2) ·Set to COOL.
COOL HEAT

Forced operation switch (SW1)

English

Trial Operation and Testing

· Before starting the trial operation, measure the voltage at the primary side of the circuit breaker. · Check that all liquid and gas stop valves are fully open. · Check that piping and wiring all match. The wiring error check can be conveniently used for underground wiring and other wiring
that cannot be directly checked. However, if the outside air temperature is 41°F (5°C) or less , the wiring error check function will not operate. · When trial operation is conducted directly after the circuit breaker is turned on, in some cases such as the outdoor temperature is below 40°F (5°C) no air will be output for about 15 to 25 minutes in order to protect the air conditioner.

1. Wiring error check
This product is capable of automatic correction of wiring errors.
Press the wiring error check switch on the outdoor unit service PC-board. However, the wiring error check switch will not function for 3 minutes after the safety breaker is turned on. About 15-20 minutes after the switch is pressed, the errors in the connection wiring will be corrected.
The service monitor LEDs indicate whether or not correction is possible, as shown in the table below. For details on how to read the LED display, refer to the collective indications label on the reverse side of the top plate or the service manual. If self-correction is not possible, check the indoor unit wiring and piping in the usual manner.

Service PC-board
A 1 2 3 4 5 Wiring error check switch (SW3)

LED Status

All Flashing

Flashing One after another

(One or more of LEDs 1 to 5 are ON)

Message Automatic correction impossible Automatic correction completed Abnormal stop [Note. 3]

Wiring correct example
Terminal block

The figure at left shows branch wiring.

From Room D From Room C to the "children's room" to the "kitchen"

From Room A

From Room B

to the "bed room" to the "living room"

Wiring error check
LED lighting sequence after a wiring correction.
Order of LED flashing: 2 1 3 4 [Note. 1]
NOTE
1) For two rooms, LED 3,4 and 5 are not displayed, and for three rooms, LED 4 and 5 is not displayed, and for four rooms, LED 5 is not displayed.
2) After wiring error check operation is completed, LED indication will continue until ordinary operation starts. This is normal. 3) Follow the product diagnosis procedures. (Details of product error diagnosis are listed on the reverse side of the top plate.)

English

2. Trial operation and testing

· During the trial operation, first check the operation of each unit individually. After this, check the simultaneous operation of all indoor units. Check both COOL and HEAT operations.
2-1. Measure the supply voltage and make sure that it is within the specified range.

2-2. In COOL operation, select the lowest programmable temperature;
in HEAT operation, select the highest programmable temperature.
· When operating the air conditioner in COOL operation in winter, or HEAT operation in summer, activate trial operation mode by following the instructions in the installation manual for the indoor unit.

2-3. Carry out the trial operation following the instructions in the operation manual to ensure that all functions and parts, such as the movement of the flap, are working properly.
· To protect the air conditioner, restart operation is disabled for 3 minutes after the system has been turned off. · When trial operation is conducted in HEAT operation directly after the circuit breaker is turned on, in some cases no
air will be output for about 3 to 20 minutes in order to protect the air conditioner.
· During COOL operation, frost may form on the gas stop valve or other parts. This is normal.

2-4. After running the unit for about 20 minutes, measure the temperatures at the

indoor unit inlet and outlet.

· If the measurements are above the values shown in the table below, then they are normal.

COOL operation

HEAT operation

Temperature difference between inlet and outlet

About 14°F (8°C)

About 36°F (20°C)

(When running in one room)

2-5. After trial operation is complete, set the temperature to a normal level (78°F to 82°F (26°C to 28°C) in COOL operation, 68°F to 75°F (20°C to 24°C) in HEAT

operation).

· The air conditioner draws a small amount of power in its standby mode. If the system is not to be used for some time after installation, shut off the circuit breaker to eliminate unnecessary power consumption.
· If the circuit breaker trips to shut off the power to the air conditioner, the system will restore the original operation mode when the circuit breaker is opened again.

3. Test items

Test item Indoor and outdoor units are installed securely. No refrigerant gas leaks. Refrigerant gas and liquid pipes and indoor drain hose extension are thermally insulated. Draining line is properly installed. System is properly grounded. Only specified wires are used for all wiring, and all wires are connected correctly. Indoor or outdoor unit's air inlet or air outlet are unobstructed. Stop valves are opened. Pipes and wires are connected to the corresponding terminal blocks/connection ports for the connected unit. The priority room setting is set for only 1 room. Indoor unit properly receives remote control commands.

Symptom Fall, vibration, noise Incomplete cooling/heating function
Water leakage
Water leakage Electrical leakage No operation or burn damage
Incomplete cooling/heating function Incomplete cooling/heating function
Incomplete cooling/heating function
The priority room setting will not function. No operation

Check

English

https://www.northamerica-daikin.com

3P740830-1B

Two-dimensional bar code is a manufacturing code.
M23B155A (2404) HT

References

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