Mitsubishi Electric MXZ-2A20NA-1 Installation manual

Split-type Air-Conditioner
MXZ-2A20NA
INSTALLATION MANUAL
English
• Refer to the installation manual of each indoor unit for indoor unit installation.
Français
Español
ATTENTION
This manual mentions how to install only the outdoor unit MXZ-2A20NA.
As for the way of installation for indoor unit, please refer to the installation manual
being attached each indoor unit.
The installation manual details the suggested installation method.
Any structural alterations necessary for installation must comply with local building
code requirements.
CONTENTS
1. BEFORE INSTALLATION...............................................................................2
2. OUTDOOR UNIT INSTALLATION..................................................................5
3. FLARING WORK AND PIPE CONNECTION..................................................7
4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN............................8
FOR INSTALLER
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1. BEFORE INSTALLATION
1-1.THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY
• Be sure to read “THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY” before installing the air conditioner.
• Be sure to observe the warnings and cautions specified here as they include important items related to safety.
• After reading this manual, be sure to keep it together with the OPERATING INSTRUCTIONS for future reference.
WARNING
(Could lead to death, serious injury, etc.)
n Do not install the unit by yourself (user).
Incomplete installation could cause fire or electric shock, injury due to the
unit falling, or leakage of water. Consult the dealer from whom you purchased the unit or a qualified installer.
n Perform the installation securely referring to the installation manual.
Incomplete installation could cause fire or electric shock, injury due to the
unit falling, or leakage of water.
n Install the unit securely in a place which can bear the weight of the
unit.
If the installation location cannot bear the weight of the unit, the unit
could fall causing injury.
n Perform electrical work according to the installation manual and be
sure to use an exclusive circuit. Do not connect other electrical appliances to the circuit.
If the capacity of the power circuit is insufficient or there is incomplete
electrical work, it could result in a fire or an electric shock.
n Do not damage the wires by applying excessive pressure with parts
or screws.
Damaged wires could cause fire.
n Be sure to cut off the main power in case of setting up the indoor P.C.
board or wiring works.
Failure to do so could cause electric shock.
n Use the specified wires to connect the indoor and outdoor units securely and attach the wires firmly to the terminal block connecting
sections so the stress of the wires is not applied to the sections.
Incomplete connecting and securing could cause fire.
n Do not install the unit in a place where inflammable gas may leak.
If gas leaks and accumulates in the area around the unit, it could cause
an explosion.
n Do not use intermediate connection of the power cord or the extension cord and do not connect many devices to one AC outlet.
It could cause a fire or an electric shock due to defective contact, defective insulation, exceeding the permissible current, etc.
n Be sure to use the parts provided or specified parts for the installation work.
The use of defective parts could cause an injury or leakage of water due
to a fire, an electric shock, the unit falling, etc.
n When plugging the power supply plug into the outlet, make sure
that there is no dust, clogging, or loose parts in both the outlet and
the plug. Make sure that the power supply plug is pushed completely into the outlet.
If there is dust, clogging, or loose parts on the power supply plug or the
outlet, it could cause electric shock or fire. If loose parts are found on the
power supply plug, replace it.
CAUTION
n Attach the electrical cover to the indoor unit and the service panel
to the outdoor unit securely.
If the electrical cover of the indoor unit and/or the service panel of the
outdoor unit are not attached securely, it could result in a fire or an
electric shock due to dust, water, etc.
n When installing or relocating the unit, make sure that no substance other than the specified refrigerant (R410A) enters the
refrigerant circuit.
Any presence of foreign substance such as air can cause abnormal
pressure rise or an explosion.
n Do not discharge the refrigerant into the atmosphere. If refrigerant
leaks during installation, ventilate the room.
If refrigerant comes in contact with a fire, harmful gas could be generated.
n Check that the refrigerant gas does not leak after installation has
been completed.
If refrigerant gas leaks indoors, and comes into contact with the flame
of a fan heater, space heater, stove, etc., harmful substances will be
generated.
n Use appropriate tools and piping materials for installation.
The pressure of R410A is 1.6 times more than R22. Not using appropriate tools or materials and incomplete installation could cause the pipes
to burst or injury.
n When pumping down the refrigerant, stop the compressor before
disconnecting the refrigerant pipes.
If the refrigerant pipes are disconnected while the compressor is running and the stop valve is open, air could be drawn in and the pressure
in the refrigeration cycle could become abnormally high. This could
cause the pipes to burst or injury.
n When installing the unit, securely connect the refrigerant pipes
before starting the compressor.
If the compressor is started before the refrigerant pipes are connected
and when the stop valve is open, air could be drawn in and the pressure in the refrigeration cycle could become abnormally high. This
could cause the pipes to burst or injury.
n Fasten a flare nut with a torque wrench as specified in this
manual.
If fastened too tight, a flare nut may break after a long period and cause
refrigerant leakage.
n The unit shall be installed in accordance with national wiring regulations.
n Ground the unit correctly.
Do not connect the ground to a gas pipe, water pipe, lightning rod or
telephone ground. Defective grounding could cause electric shock.
(Could lead to serious injury in particular environments when operated incorrectly.)
nInstall an ground leakage breaker depending on the installation
place.
If an ground leakage breaker is not installed, it could cause electric
shock.
n Perform the drainage/piping work securely according to the installation manual.
If there is defect in the drainage/piping work, water could drop from the
unit, soaking and damaging household goods.
n Do not touch the air inlet or the aluminum fins of the outdoor
unit.
This could cause injury.
n Do not install the outdoor unit where small animals may live.
If small animals enter and touch the electric parts inside the unit, it
could cause a malfunction, smoke emission, or fire. Also, advise user
to keep the area around the unit clean.
1-2.REQUIRED TOOLS FOR INSTALLATION
Phillips screwdriver
Level
Scale
Utility knife or scissors
Torque wrench
Wrench (or spanner)
4 mm (5/32 in.) hexagonal wrench
Flare tool for R410A
Gauge manifold for R410A
Vacuum pump for R410A
Charge hose for R410A
Pipe cutter with reamer
1-3.SPECIFICATIONS
Model
MXZ-2A20NA
Power supply
Rated
Frequency
Voltage
208/
60 Hz
230 V
Max. pipe length per indoor
unit / for multi-system
25 m (82 ft) / 50 m (164 ft)
*1Never use pipes with thickness less than specified. The pressure resistance will be insufficient.
*2Use a copper pipe or a copper-alloy seamless pipe.
*3Be careful not to crush or bend the pipe during pipe bending.
*4Refrigerant pipe bending radius must be 100 mm (4 in.) or more.
*5If pipe length exceeds 40 m (131 ft), additional refrigerant (R410A) charge
is required. (No additional charge is required for pipe length less than
40 m (131 ft).)
Additional refrigerant (m) = A × (pipe length (m) - 40)
(pipe length (ft) - 131)
Additional refrigerant (ft) = A ×
5
Pipe length and height difference *2, *3, *4, *8
Max. no. of bends per inMax. height difference
door unit / for multi system
15 m (49 ft)
25 / 70
Refrigerant adjustment A
*5
20 g/m (1.06 oz each 5 ft)
*6Insulation material : Heat resisting foam plastic 0.045 specific gravity
*7Be sure to use the insulation of specified thickness. Excessive thickness
may cause incorrect installation of the indoor unit and insufficient thickness may cause dew drippage.
*8 If the outdoor unit is installed higher than the indoor unit, max. height
difference is reduced to 10 m (33 ft).
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1-4.SELECTING PIPE SIZE AND OPTIONAL DIFFERENT-DIAMETER JOINTS
The diameter of connection pipes differs according to the type and capacity of indoor units. Match the diameters of connection pipes for indoor and outdoor
units according to the following table.
• If the diameter of connection pipes does not match the diameter of pipe end connections, use optional different-diameter joints.
[mm (inch)]
Indoor unit
09/12
15/17
Pipe size
(liquid / gas)
6.35 (1/4) / 9.52 (3/8)
6.35 (1/4) / 12.7 (1/2)
6.35 (1/4) / 9.52 (3/8)
-/-
- / MAC-454JP
Outdoor unit
A UNIT
B UNIT
1-5.SELECTING THE INSTALLATION LOCATION
•
•
•
•
•
Where it is not exposed to strong wind.
Where airflow is good and dustless.
Where rain or direct sunshine can be avoided as much as possible.
Where neighbours are not annoyed by operation sound or hot air.
Where rigid wall or support is available to prevent the increase of operation sound or vibration.
• Where there is no risk of combustible gas leakage.
• When installing the unit at a high level, be sure to secure the unit legs.
• Where it is at least 3 m (9.84 ft) away from the antenna of TV set or
radio. Operation of the air conditioner may interfere with radio or TV reception in areas where reception is weak. An amplifier may be required
for the affected device.
• Install the unit horizontally.
• Please install it in an area not affected by snowfall or blowing snow.
In areas with heavy snow, please install a canopy, a pedestal and/or
some baffle boards.
Note:
It is advisable to make a piping loop near outdoor unit so as to reduce
vibration transmitted from there.
FREE SPACE REQUIRED AROUND OUTDOOR UNIT
1.Top side obstacles
When there is an obstacle behind the
rear side only, it does not matter if
there is an obstacle over the top side
as shown in the figure below.
100 (3.94) or more
500 (19.68)
or more
Note:
When operating the air conditioner in low outside temperature, be sure
to follow the instructions described below.
• Never install the outdoor unit in a place where its air inlet/outlet side
may be exposed directly to wind.
• To prevent exposure to wind, install the outdoor unit with its air inlet
side facing the wall.
• To prevent exposure to wind, it is recommended to install a baffle
board on the air outlet side of the outdoor unit.
Avoid the following places for installation where air conditioner trouble
is liable to occur.
• Where flammable gas could leak.
• Where there is much machine oil.
• Salty places such as the seaside.
• Where sulfide gas is generated such as a hot spring.
• Where there is high-frequency or wireless equipment.
2.Front (blowing) side open
As long as space like the one
shown in the figure can be
maintained, it does not matter if there are obstacles in
three directions (but top side
is open).
200 (7.87)
or more
100 (3.94)
or more
3.Obstacles on front (blowing) side only
350 (13.78)
or more
4.Obstacles on front and rear side only
In this case, the rear, both sides and
top should be open.
500 (19.68) or more
The unit can be used by attaching an optional outdoor
blowing guide (MAC-889SG)
(but both sides and top are
open).
100 (3.94)
or more
500 (19.68) or more
Blowing guide (MAC-889SG)
5.Service space
Keep the service space as shown in the figure below for maintenance.
Service space
100 (3.94)
or more
500 (19.68) or more
• When installing the unit in an area that is enclosed on four sides such
as a verandah, be sure to leave move than 200 mm (7.87 in.) behind
the unit as shown.
• When there is a lack of airflow or there is a possibility of becoming
short cycle, install an outlet guide and make sure there is enough
space behind the rear side of the air inlet.
Note:
Make sure not to install several outdoor units sideways next to each
other.
100 (3.94)
or more
500 (19.68)
or more
Window
350 (13.78) or more
More than
100 (3.94)
More than 200
(7.87)
More than
200 (7.87)
More than
350 (13.78)
Less than 1,200 (47.3) of the front surface side
More than 200 (7.87)
[Unit: mm (inch)]
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1-6.INSTALLATION DIAGRAM
PARTS TO BE PROVIDED AT YOUR SITE
After the leak test, apply insulating material tightly so that there is
no gap.
When the piping is to be attached to a wall containing metals
(tin plated) or metal netting, use
a chemically treated wooden
piece 20 mm (7.9 in.) or thicker
between the wall and the piping
or wrap 7 to 8 turns of insulation
vinyl tape around the piping.
To use existing piping, perform
COOL operation for 30 minutes
and pump down before removing
the old air conditioner. Remake
flare according to the dimension
for new refrigerant.
Open as a rule
More than 500 mm
(19.69 in.) if the front
and both sides are open
MXZ-2A20NA
More than 100 mm (3.94 in.)
More than 200 mm (7.87 in.) if there are
obstacles to both sides
More than
100 mm
(3.94 in.)
Open as a rule
More than 500 mm (19.69 in.) if the back,
both sides and top are open
(A)
(B)
(C)
(D)
(E)
Power supply cord*
Indoor/outdoor unit connecting wire*
Extension pipe (Refer to 1-4.)
Wall hole cover
Piping tape
Extension drain hose
(or soft PVC hose, 15 mm (19/32
(F)
in.) inner diameter or hard PVC
pipe VP16)
(G) Refrigeration oil
(H)
(I)
(J)
(K)
Putty
Pipe fixing band
Fixing screw for (I)
Wall hole sleeve
Soft PVC hose, 15 mm (19/32 in.)
(L) inner diameter or hard PVC pipe
VP16 for drain socket
1
1
1
1
1
1
Little
amount
1
2 to 7
2 to 7
1
1
* Note:
Place indoor/outdoor unit connecting wire (B) and
power supply cord (A) at least 1 m (39.4 in.) away
from the TV antenna wire.
The “Q’ty” for (B) to (K) in the above table is quantity to be used per indoor unit.
More than 350 mm (13.78 in.)
Units should be installed by licensed contractor according to local code requirements.
Outdoor unit installation
Air out
835(32.87)
396(15.59)
31(1.22)
Air in
330(13.0)
Air in
361(14.21)
500(19.69)
38
(1.50)
166
(6.53)
4-10(0.39) × 21(0.83) Oval holes
[Unit: mm (inch)]
1-7.MOUNTING ARRANGEMENT OF DRAIN SOCKET
Please perform the drain piping work only when draining from one place.
1 Choose one hole to discharge drain and install the drain socket to the hole.
2 Close the rest of the holes with the drain caps.
3 Connect a vinyl hose of 15 mm (19/32 in.) in the inside diameter on the market with the drain socket and lead drain.
Note:
Do not use the drain socket and the drain cap in the cold region.
Drain may freeze and it makes the fan stop.
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2. OUTDOOR UNIT INSTALLATION
2-1.CONNECTING WIRES FOR OUTDOOR UNIT
•
•
•
•
Be sure to use special circuits for room air conditioner.
Wiring work should be based on applicable technical standards.
Wiring connections should be made following the diagram.
Screws should be tightened so they won’t loosen.
ELECTRICAL SPECIFICATIONS
OUTDOOR UNIT
Power supply (V, PHASE, Hz)
Max. Fuse size (time delay) (A)
Min. Circuit Ampacity (A)
Fan motor (F.L.A)
Compressor
Control voltage
(R.L.A)
(L.R.A)
MXZ-2A20NA
208/230, 1, 60
20
15
0.96
10.1
15
Indoor unit-Remote controller : (Wireless)
Indoor unit-Outdoor unit : DC12-24V
1)Remove the service panel.
2)Fix the conduit connector to conduit cover with lock nut then secure it
against unit with screws.
3)Fix the conduit cover to the outdoor unit then secure it with screws.
4)Connect power supply cord and indoor/outdoor connecting wire to the terminal block.
(Leave some slack in wires to allow easier servicing.)
5)Close the service panel securely. Make sure that 3-2. PIPE CONNECTION
is completed.
Grounding terminal
Conduit
cover
Lock nut
Remark:
* A disconnect switch should be required. Check the local code.
** Use a ring tongue terminal in order to connect a ground wire to terminal.
INDOOR UNIT A
INDOOR UNIT B
Terminal block
208/230 V AC
1phase 60 Hz
Terminal
block 1
Terminal block
Grounding
terminal **
Grounding terminal **
Disconnect 208/230 V AC
1phase 60 Hz
switch *
Disconnect
switch *
Grounding
terminal **
Grounding
terminal **
Terminal block
UNIT A
Connector
Terminal block
OUTDOOR UNIT
UNIT B
Ground
Power supply 208/230 V AC
1phase 2wires 60 Hz
Connect wires to the matching numbers of terminals.
CONNECTING WIRES AND CONNECTING GROUND WIRE
• Use solid conductor AWG14 or stranded conductor AWG14.
• Use double insulated copper wire with 600 V insulation.
• Use copper conductors only.
* Follow local electrical code.
POWER SUPPLY CABLE AND GROUND WIRE
• Use solid or stranded conductor AWG14.
• Use copper conductors only.
* Follow local electrical code.
WARNING:
Use the indoor/outdoor unit connecting wire that meets the Standards to connect the indoor and outdoor units and fix the wire to the terminal
block securely so that no external force is conveyed to the connecting section of the terminal block. An incomplete connection or fixing of the
wire could result in a fire.
For future servicing, give extra length to the connecting wires.
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3. FLARING WORK AND PIPE CONNECTION
3-1.FLARING WORK
1)Cut the copper pipe correctly with pipe cutter. (Fig. 1, 2)
2)Completely remove all burrs from the cut cross section of pipe. (Fig. 3)
• Put the end of the copper pipe to downward direction as you
remove burrs in order to avoid to let burrs drop in the piping.
3)Remove flare nuts attached to indoor and outdoor units, then put them
on pipe having completed burr removal. (Not possible to put them on
after flaring work.)
4)Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension
shown in the table. Select A mm from the table according to the tool
you use.
5)Check
• Compare the flared work with Fig. 6.
• If flare is noted to be defective, cut off the flared section and do
flaring work again.
No good
Good
Copper
pipe
Tilted Uneven Burred
Fig. 1
Fig. 2
Flaring tool
Burr
Copper pipe
Spare reamer
Pipe cutter
Clutch type
Wing nut type
Fig. 3
Fig. 4
Smooth all
around
Copper pipe
Die
Flare nut
Pipe diameter [mm (inch)]
ø6.35 (1/4)
ø9.52 (3/8)
ø12.7 (1/2)
ø15.88 (5/8)
Nut
(mm)
17
22
26
29
Clutch type tool for R410A
0 to 0.5
(0. to 0.02)
A [mm (inch)]
Clutch type tool for R22
1.0 to 1.5
(0.04 to 0.06)
Inside is shining without any
scratches.
Even length
all around
Fig. 5
Fig. 6
Tightening torque
Wing nut type tool for R22
1.5 to 2.0
(0.06 to 0.08)
2.0 to 2.5
(0.08 to 1.0)
N•m
kgf•cm
ft·Ib
13.7 to 17.7
34.3 to 41.2
49.0 to 56.4
73.5 to 78.4
140 to 180
350 to 420
500 to 575
750 to 800
10 to 13
25 to 30
36 to 42
54 to 58
3-2.PIPE CONNECTION
• Fasten flare nut with a torque wrench as specified in the table.
• When fastened too tight, flare nut may brake after a long period and
cause refrigerant leakage.
Outdoor unit connection
Connect pipes to stop valve pipe joint of the outdoor unit in the same
manner applied for indoor unit.
• For tightening, use a torque wrench or spanner and use the same
tightening torque applied for indoor unit.
3-3.INSULATION AND TAPING
1)Cover piping joints with pipe cover.
2)For outdoor unit side, surely insulate every piping including valves.
3)Using piping tape (E), apply taping starting from the entry of outdoor
unit.
• Stop the end of piping tape (E) with tape (with adhesive agent attached).
• When piping have to be arranged through above ceiling, closet or
where the temperature and humidity are high, wind additional commercially sold insulation to prevent condensation.
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4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN
4-1.PURGING PROCEDURES AND LEAK TEST
1)Remove service port cap of stop valve on the side of the outdoor unit
gas pipe. (The stop valve will not work in its initial state fresh out of
the factory, totally closed with cap on.)
2)Connect gauge manifold valve and vacuum pump to service port of
stop valve on the gas pipe side of the outdoor unit.
3)Run the vacuum pump. (Vacuumize for more than 15 minutes.)
4)Check the vacuum with gauge manifold valve, then close gauge
manifold valve, and stop the vacuum pump.
5)Leave as it is for one or two minutes. Make sure pointer gauge manifold valve remains in the same position. Confirm that pressure gauge
shows –0.101 MPa [Gauge] [–760 mmHg(-30 in.Hg)].
6)Remove gauge manifold valve quickly from service port of stop
valve.
7)After refrigerant pipes are connected and evacuated, fully open all
stop valves on both sides of gas pipe and liquid pipe. Operating without fully opening lowers the performance and this causes trouble.
8)Refer to 1-4., and charge the prescribed amount of refrigerant if
needed. Be sure to charge slowly with liquid refrigerant. Otherwise,
composition of the refrigerant in the system may be changed and affect performance of the air conditioner.
9)Tighten cap of service port to obtain the initial status.
10) Leak test
*Close
*Open
Service port cap
(Torque 13.7 to
17.7 N•m, 140 to
180 kgf•cm, 10 to
13 ft•lb)
Stop valve
for GAS
A
Close
Open
Stop valve
for LIQUID
Handle High
Charge hose
(for R410A)
Vacuum pump
(for R410A)
When attaching the control valve to
the service port, valve core may deform or loosen if excess pressure is
applied. This may cause gas leak.
Body
Service port
4-2.GAS CHARGE
When attaching the control valve to
the service port, make sure that the
valve core is in closed position, and
then tighten part A. Do not tighten
part A or turn the body when valve
core is in open position.
Union
Stop valve
Liquid pipe
Perform gas charge to unit.
1 Connect gas cylinder to the service port of stop valve.
2 Perform air purge of the pipe (or hose) coming from refrigerant gas
cylinder.
3 Replenish specified amount of the refrigerant, while operating the air
conditioner for cooling.
CAUTION:
When charging the refrigerant system with additional refrigerant, be sure
to use liquid refrigerant. Adding gas refrigerant may change the composition of the refrigerant in the system and affect normal operation of the air
conditioner. Also, charge the system slowly, otherwise the compressor
will be locked.
To maintain the high pressure of the gas cylinder, warm the gas cylinder
with warm water [under 40°C(140°F)] during cold season. But never use
naked fire or steam.
Gauge manifold
valve (for R410A)
Handle
Low
Precautions when using
the control valve
Control
valve
Compound pressure
gauge (for R410A)
Pressure gauge
(for R410A)
Hexagonal wrench
Charge hose
(for R410A)
Note:
In case of adding refrigerant, comply with the quantity specified for the
refrigerating cycle.
–0.101MPa [–760 mmHg
(-30 in.Hg)]
Stop valve cap
(Torque 19.6 to
29.4 N•m, 200 to
300 kgf•cm, 15 to
22 ft•lb)
*4 to 5 turns
Union
Outdoor
unit
Indoor
unit
Union
Stop valve with
service port
Gas pipe
Union
Refrigerant gas cylinder operating valve
(for R410A)
Gauge manifold
valve (for R410A)
Charge hose (for R410A)
Refrigerant gas cylinder
for R410A with siphon
Refrigerant (liquid)
Electronic scale for
refrigerant charging
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4-3.TEST RUN
• Be sure to perform the test run for each unit. Make sure each indoor unit operates properly following the installation manual attached to the unit.
• If you perform the test run for all indoor units at once, you cannot detect any erroneous connection, if any, of the refrigerant pipes and the indoor/outdoor
unit connecting wires.
About the restart protective mechanism
Once the compressor stops, the restart preventive device operates so the compressor will not operate for 3 minutes to protect the air conditioner.
4-4.EXPLANATION TO THE USER
• Using the OPERATING INSTRUCTIONS, explain to the user how to use the air conditioner (how to use the remote controller, how to remove the air filters, how to remove or put the remote controller in the remote controller holder, how to clean, precautions for operation, etc.)
• Recommend the user to read the OPERATING INSTRUCTIONS carefully.
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HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO
100-8310, JAPAN
JG79A039H01
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