Daikin RX20J3V1B- Installation Manual

Accessories

Precautions for Selecting the Location

3P141697-6D

(M04B140A)

DAIKIN AIR CONDITIONER

Construct a large canopy.

Construct a pedestal.

Install the unit high enough off the

ground to prevent burying in snow.

Accessories supplied with the outdoor unit:

(A) Installation Manual

(B) Drain plug

There is on the bottom
packing case.

Cannot be installed hanging from ceiling or stacked.

1

1

OUTDOOR UNIT

1) Choose a place solid enough to bear the weight and vibration of the unit, where the operation noise will not be amplified.
2) Choose a location where the hot air discharged from the unit or the operation noise will not cause a nuisance to the

neighbors of the user.

3) Avoid places near a bedroom and the like, so that the operation noise will cause no trouble.
4) There must be sufficient spaces for carrying 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 be free from the possibility of flammable gas leakage in a nearby place.
7) Install units, power cords and inter-unit cables at least 9.5 feet away from television and radio sets. This is to

prevent interference to images and sounds. (Noises may be heard even if they are more than 9.5 feet away
depending on radio wave conditions.)

8) In coastal areas or other places with salty atmosphere of sulfate gas, corrosion may shorten the life of the air conditioner.
9) Since drain flows out of the outdoor unit, do not place under the unit anything which must be kept away from moisture.

Note

When operating the air conditioner in a low outdoor ambient
temperature, be sure to follow the instructions described below.
1) To prevent exposure to wind, install the outdoor unit with its

suction side facing the wall.

2) Never install the outdoor unit at a site where the suction side

may be exposed directly to wind.

3) To prevent exposure to wind, it is recommended to install a

baffle plate on the air discharge side of the outdoor unit.

4) In heavy snowfall areas, select an installation site where the

snow will not affect the unit.

CAUTIONS

Indoor/Outdoor Unit Installation Drawings

Installation

Outdoor Unit Installation Guidelines

Cut thermal insulation
pipe to an appropriate
length and wrap it with
tape, making sure that no
gap is left in the insulation
pipe’s cut line.

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

Caulk
pipe hole
gap
with putty.

(Foot bolt-hole ce

ntres)

22 13/16 in

(Foot bolt-hole

centres)

13 in

9.8 in from wall

Allow space for piping
and electrical servicing.

Allow 11.8 in of
work space below
the ceiling surface.

If there is the danger of the unit falling
or overturning, fix the unit with
foundation bolts, or with wire or other
means.

If the location does not have good
drainage, place the unit on a level
mounting base (or a plastic pedestal).
Install the outdoor unit in a level
position. Failure to do so may result in
water leakage or accumulation.

Level mounting base
(available separately)

Clamping material

Insulation tube

Service lid

Tape

Also insulate the connection on the outdoor unit.

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 above.

More than 3 15/16

More than 13 3/4

Side view

47 3/16
or less

More than 1 15/16

More than 1 15/16

Top view

More
than 3 15/16

More than 13 3/4

Top view

More than 3 15/16

More than 13 3/4

More than 1 15/16

For installation of the indoor units, refer to the installation manual which was provided with the units.
(The diagram shows a wall-mounted indoor unit.)

●

Install the unit horizontally.

●

The unit may be installed directly on a concrete verandah or a solid place if drainage is good.

●

If the vibration may possibly be transmitted to the building, use a vibration-proof rubber (field supply).

●

Where a wall or other obstacle is in the path of outdoor unit’s intake or exhaust airflow, follow the installation guidelines
below.

●

For any of the below installation patterns, the wall height on the exhaust side should be 4 ft or less.

●

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.
See “6 Refrigerant Piping Work” in “Outdoor Unit” for details.

●

It is impossible to connect the indoor unit for one room only.

Be sure to connect at least 2 rooms.

CAUTION

Wall facing one side

Walls facing two sides

Walls facing three sides

Unit: in.

Selecting a Location for Installation of the Indoor Units

Outdoor Unit

Outdoor Unit

Level
difference: 25 ft
max.

(Heat pump
unit only)

Level
difference:
49 ft max.

Indoor Unit

Outdoor Unit

Drain-water hole

Bottom frame

Drain plug

While pressing

Hose (available commercially,
inner dia. 5/8 in)

Coat here with refrigeration machine oil

Torque wrench

Piping union

Flare nut

Spanner

Flare nut tightening torque

Flare nut for

φ

1/4

10.5-12.7 ft-lbf

Flare nut for

φ

3/8

24.1-29.4 ft-lbf

Flare nut for

φ

1/2

36.5-44.5 ft-lbf

Flare nut for

φ

5/8

45.6-55.6 ft-lbf

Liquid pipe

19.5-23.8 ft-lbf

Gas pipe

35.5-44.0 ft-lbf

Wall

If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt or water out.

Be sure to
place a cap.

Rain

Gas pipe

Liquid pipe

Gas pipe
insulation

Liquid pipe
insulation

Finishing tape

Drain hose

Inter-unit wiring

(Cut exactly at

right angles.)

Remove burrs

Check

Flare’s inner
surface must
be flaw-free.

The pipe end must
be evenly flared in
a perfect circle.

Make sure that the
flare nut is fitted.

Level
difference:
49 ft max.

Indoor Unit

Outdoor Unit

Level
difference:
25 ft max.

(Heat pump
unit only)

●

The maximum allowable length of refrigerant piping, and the maximum allowable height difference between the
outdoor and indoor units, are listed below. (The shorter the refrigerant piping, the better the performance. Connect so
that the piping is as short as possible.

Shortest allowable length per room is 9.8 ft.

)

1

Installing Outdoor Unit

●

When installing the outdoor unit, refer to “Precautions for Selecting the Location” and the “Indoor/Outdoor Unit
Installation Drawings.”

●

If drain work is necessary, follow the procedures below.

2. To prevent gas leakage, apply refrigeration machine oil on both inner and outer surfaces of the flare.

(Use refrigeration oil for R410A)

3

Refrigerant Piping

1. Align the centres of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with the torque wrenches.

●

Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and escaping gas.

7

Flaring the Pipe End

1. Cut the pipe end with a pipe cutter.
2. Remove burrs with the cut surface facing

downward so that the chips do not enter the pipe.

3. Put the flare nut on the pipe.
4. Flare the pipe.
5. Check that the flaring is properly made.

2

Drain Work

●

Use drain plug for drainage.

●

If the drain port is covered by a mounting base or floor surface, place
additional foot bases of at least 1 3/16” in height under the outdoor unit’s feet.

●

In cold areas, do not use a drain hose with the outdoor unit. (Otherwise, drain
water may freeze, impairing heating performance.)

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

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

Outdoor unit capacity class

Piping to each indoor unit

Total length of piping between all units

2MXS18

82 ft max.

148 ft max.

Outdoor unit capacity class

Total length of piping for all rooms

2MXS18

98 ft

Pipe size

O.D.: 1/4” / Thickness: 0.031”
O.D.: 3/8”, 1/2” / Thickness: 0.031”
O.D.: 5/8” / Thickness: 0.039”

Pipe insulation

I.D.: 0.315-0.393” / Thickness: 0.393” min.
I.D.: 0.472-0.590” / Thickness: 0.511” min.
I.D.: 0.630-0.787” / Thickness: 0.511” min.

5

Charging with Refrigerant

●

If the total length of piping for all rooms exceeds the figure listed below, additionally charge with

0.22 oz/ft of

refrigerant (R410A) for each additional feet of piping.

6

Refrigerant Piping Work

Cautions on pipe handling

●

Protect the open end of the pipe against dust and moisture.

●

All pipe bends should be as gentle as possible. Use a pipe bender for
bending.
(Bending radius should be 1 3/16” to 1 9/16” or larger.)

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 0.052kW/mK (0.024 to 0.030 Btu/fth

°

F)

Refrigerant gas pipe’s surface temperature reaches 230

°

F max.

Choose heat insulation materials that will withstand this temperature.

●

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

●

Use separate thermal insulation pipes for gas and liquid refrigerant pipes.

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

CAUTION

4

Purging Air and Checking Gas Leakage

●

When piping work is completed, it is necessary to purge the air and check for gas leakage.
Refer to “Purging Air and Checking Gas Leakage”.

Purging Air and Checking Gas Leakage

●

If using additional refrigerant, perform air purging from the refrigerant pipes and indoor unit using a vacuum pump, then
charge additional refrigerant.

●

Use a hexagonal wrench (3/16”) to operate the shut-off valve rod.

●

All refrigerant pipe joints should be tightened with a torque wrench at the specified tightening torque.

(1) Connect projection side (on which worm pin is pressed) of charging hose (which comes from gauge manifold) to

gas shut-off valve’s service port.

(2) Fully open gauge manifold’s low-pressure valve (Lo) and completely close its high-pressure valve (Hi).

(High-pressure valve subsequently requires no operation.)

(3) Apply vacuum pumping. Check that the compound pressure gauge reads –29.9 in Hg. Evacuation for

at least 1 hour

is recommended.

(4) Close gauge manifold’s low-pressure valve (Lo) and stop vacuum pump.

(Leave as is for 4-5 minutes and make sure the coupling meter needle does not go back.
If it does go back, this may indicate the presence of moisture or leaking from connecting parts. After inspecting all
the connection and loosening then retightening the nuts, repeat steps 2 – 4.)

(5) Remove covers from liquid shut-off value and gas shut-off valve.

(6) Turn the liquid shut-off valve’s rod 90 degrees counterclockwise with a hexagonal wrench to open valve.

Close it after 5 seconds, and check for gas leakage.
Using soapy water, check for gas leakage from indoor unit’s flare and outdoor unit’s flare and valve rods.
After the check is complete, wipe all soapy water off.

(7) Disconnect charging hose from gas shut-off valve’s service port, then fully open liquid and gas shut-off valves.

(Do not attempt to turn valve rod beyond its stop.)

(8) Tighten valve lids and service port caps for the liquid and gas shut-off valves with a torque wrench at the specified

torques. See “3 Refrigerant Piping” in “Outdoor Unit” for details.

FOR USE WITH “CTXS09DVJU” INDOOR UNIT ONLY

Precautions on Installation

●

Check the strength and level of the installation ground so that the unit will not cause any operating vibration or noise after installed.

●

In accordance with the foundation drawing in fix the unit securely by means of the foundation bolts. (Prepare four sets of

M3/8” or M7/16” foundation bolts, nuts and washers each which are available on the market.)

●

It is best to screw in the foundation bolts until their length are 3/4” from the foundation surface.

3/4”

Valve cap tightening
torque

Service port cap
tightening torque

7.9-10.8 ft-lbf

1) Do not use mineral oil on flared part.
2) Prevent mineral oil from getting into the system as this would reduce the unit life.
3) Never use piping which has been used for previous installations. Only use parts which are provided with the unit.
4) Do never install a refrigerant drier to this unit.
5) The drying material may dissolve and damage the system.
6) Incomplete or improper flaring may cause refrigerant gas leakage.

Set exactly at the position shown below.

A

Flaring

Die

A

0 ~ 0.020”

Clutch-type

Flare tool for R410A

0.039 ~ 0.059”

Clutch-type (Rigid-type)

0.059 ~ 0.079”

Wing-nut type (Imperial-type)

Conventional flare tool

Pump Down Operation

Forced Operation

Gas shut-off valve

Close

Hexagonal
wrench

Liquid shut-off
valve

Valve lid

Service PC-board

Operation Mode
switch (SW2)

Forced Operation
switch (SW1)

(1) Remove the valve lid from liquid shut-off valve and gas

shut-off valve.

(2) Carry out forced cooling operation.
(3) After five to ten minutes, close the liquid shut-off valve

with a hexagonal wrench.

(4) After two to three minutes, close the gas shut-off valve

and stop forced cooling operation.

(1) Turn the Operation Mode switch (SW2) to “COOL.”
(2) Press the Forced Operation switch (SW1) to begin forced cooling. Press the Forced Operation switch (SW1) again to

stop forced cooling.

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

Warning

• When the piping work is completed, it is necessary to purge the air and check for gas leakage.

1) Do not place any substance other than the specified refrigerant (R410A) into the refrigeration cycle.
2) When a refrigerant gas leak occurs, ventilate the room as soon and as much as possible.
3) R410A, as well as other refrigerants, should always be recovered and never be released directly into the

environment.

4) Use a vacuum pump for R410A exclusively. Using the same vacuum pump for different refrigerants may

damage the vacuum pump or the unit.

Warning

Safety Precautions

WARNING

• After completing installation, test the unit to check for installation errors. Give the user adequate

instructions concerning the use and cleaning of the unit according to the Operation Manual.

• Install the air conditioner according to the instructions given in this manual.

Incomplete installation may cause water leakage, electrical shock, fire or equipment damage.

• Installation should be left to the authorized dealer or another trained professional.

Improper installation may cause water leakage, electrical shock, fire, or equipment damage.

• Be sure to use the supplied or exact specified installation parts.

Use of other parts may cause the unit to come to lose, water leakage, electrical shock, fire or equipment damage.

• Install the air conditioner on a solid base that is level and can support the unit's weight.

An inadequate base or incomplete installation may cause injury or equipment damage in the event the unit falls off the base or comes loose.

• Electrical work should be carried out in accordance with the installation manual and the national, state and local electrical wiring codes.

Insufficient capacity or incomplete electrical work may cause electrical shock, fire or equipment damage.

• Be sure to use a dedicated power circuit. Never use a power supply shared by another appliance. Follow all appropriate electrical codes.

• Use the specified types of wires for electrical connections between the indoor and outdoor units. Follow all state and local electrical codes.

Firmly clamp the interconnecting wires so their terminals receive no external stresses. Incomplete connections or clamping may cause terminal overheating, fire or euipment damage.

• After all installation is complete, check to make sure that no refrigerant is leaking.

(The refrigerant produces a toxic gas if exposed to flames.)

• The following safety symbols are used throughout this manual:

Be sure to observe this instruction.

Be sure to establish a proper
earth grounding connection.

Never attempt.

• After connecting all wiring be sure to shape the cables so that they do not put undue stress on the electrical covers, panels or terminals.

Install covers over the wires. Incomplete cover installation may cause terminal overheating, electrical shock,fire or equipment damage.

• When installing or relocating the system, be sure to keep the refrigerant circuit free from all substances other than the specified refrigerant (R410A), such as air.

(Any presence of air or other foreign substance in the refrigerant circuit causes an abnormal pressure rise which may result in rupture, resulting in injury.)

• If any refrigerant has leaked out during the installation work, ventilate the room.

(The refrigerant produces a toxic gas if exposed to flames.)

• When installing the unit in a small room, take measures against to keep refrigerant concentration from exceeding allowable safety limits in the event of refrigerant leakage.

Contact the place of purchase for more information. Excessive refrigerant in a closed ambient can lead to oxygen deficiency.

• Be sure to establish a ground. Do not ground the unit to a utility pipe, arrester, or telephone ground.

Incomplete or inadequate grounding may cause equipment damage, or electrical shock and personal injury. A high surge
current from lightning or other sources may cause damage to the air conditioner.

• Install an leak circuit breaker, as required.

If an leak circuit breaker is not installed, electric shock may result.

• Be sure to install a ground fault circuit interrupter breaker.

Failure to install a ground fault circuit interrupter breaker may result in electrically shocks or personal injury.

• During pump-down, stop the compressor before removing the refrigerant piping.

If the compressor is still running and the shut-off valve is open during

pump-down, air will be sucked in when the refrigerant piping is removed, causing abnormally high pressure which could lead to equipment damage or and personal injury.

• During installation, attach the refrigerant piping securely before running the compressor.

If the compressor is not attached and the shut-off valve is open during pump-down, air will be sucked in when the compressor is run, causing
abnormally high pressure whichcould lead to equipment damage and personal injury.

• For wiring, use a wire or cable long enough to cover the entire distance with no splices if possible.

Do not use an extension cord. Do not put other loads on the power supply. Use a only a separate dedicated power circuit.

(Failure to do so may cause abnormal heat, electric shock,fire or equipment damage.)

WARNING

CAUTION

Failure to follow any of WARNING is likely to result in such grave consequences as death or serious injury.

Failure to follow any of CAUTION may in some cases result in grave consequences.

• Read these Safety Precautions carefully to ensure correct installation.

• This manual classifies the precautions into WARNINGS and CAUTIONS. Be sure to follow all the

precautions below: they are all important for ensuring safety.

Safety Precautions

CAUTION

• Do not install the air conditioner where gas leakage would be exposed to open flames.

If the gas leaks and builds up around the unit, it may catch fire.

• Establish drain piping according to the instructions of this manual.

Inadequate piping may cause water damage.

• Tighten the flare nut according to the specified torque. A torque wrench should be used.

If the flare nut is tightened too much, the flare nut may crack over time and cause refrigerant leakage.

• Do not touch the heat exchanger fins.

Improper handling may result in injury.

• Be very careful about product transportation.

Some products use PP bands for packaging. Do not use any PP bands for a means of transportation. It is dangerous.

• Note for installing the outdoor unit. (For heat pump model only.)

In regions of the country where the outside temperature is at or

below the freezing point, the drain may freeze. If so, it is recommended that an electric heater be installed in order to protect the drain from freezing.