Mitsubishi Heavy Industries SRK63ZR-S Technical Manual Download

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'15 • SRK-T-175

Wires for connecting indoor

and outdoor units

Exterior tape

Gas piping

Insulation

Liquid piping

Band (procured locally)

Pipe cover (procured locally)

8) Heating and condensation prevention

Take care so that installed pipes may not touch components within a unit.

If pipes touch internal components, abnormal sounds and/or vibrations.

4) On-site piping work

IMPORTANT

How to remove the side cover

Remove the screw of the side cover and

remove to the front.

Flared pipe end : A

(mm)

ø6.35
ø12.7

ø15.88

Copper pipe

outer diameter

A –04

9.1

16.6
19.7

ø6.35
ø12.7

ø15.88

Copper pipe

outer diameter

0.5

1.0

1.5

Copper pipe protrusion for flaring : B

(mm)

In the case of a rigid (clutch) type

With an R410A tool With a conventional tool

CAUTION

Do not apply force beyond proper fastening torque in tightening the flare nut.

Tightening angle (

)

Tightening torque (N·m)

ø6.35 (1/4")
ø12.7 (1/2")

ø15.88 (5/8")

Recommended length of a tool handle (mm)

Service valve size (mm)

5) Air tightness test

Gas side

service valve

Check joint

Pre

ssu

rize

Outdoor unit

Indoor unit

6) Evacuation

Pay attention to the following points in addition to the above for the R410A and compatible machines.

Air tightness test completed

Fill refrigerant

Vacuum gauge check

Vacuuming completed

Vacuuming begins

3) Refrigerant pipe wall thickness and material

NOTE

*Phosphorus deoxidized seamless copper pipe ICS 23.040.15, ICS 77.150.30

ø6.35

0.8

O-type pipe

ø12.7

0.8

O-type pipe

ø15.88

1.0

O-type pipe

Pipe diameter [mm]

Minimum pipe wall thickness [mm]

Pipe material*

• Select refrigerant pipes of the table shown on the right wall thickness and material as specified

for each pipe size.

Although outdoor and indoor units themselves have been tested for air tightness at the factory, check the connecting pipes after the installation work for air tightness from the service valve’s

check joint equipped on the outdoor unit side. While conducting a test, keep the service valve shut all the time.

a) Raise the pressure to 0.5MPa, and then stop. Leave it for five minutes to see if the pressure drops.

b) Then raise the pressure to 1.5MPa, and stop. Leave it for five more minutes to see if the pressure drops.

c) Then raise the pressure to the specified level (4.15MPa), and record the ambient temperature and the pressure.

d) If no pressure drop is observed with an installation pressurized to the specified level and left for about one day, it is acceptable. When the ambient temperature fall 1 C, the pressure also

fall approximately 0.01MPa. The pressure, if changed, should be compensated for.

e) If a pressure drop is observed in checking e) and a) – d), a leak exists somewhere. Find a leak by applying bubble test liquid to welded parts and flare joints and repair it. After repair,

conduct an air tightness test again.

In conducting an air tightness test, use nitrogen gas and pressurize the system with nitrogen gas from the gas side. Do not use a medium other than nitrogen gas under any circumstances.

• Carry out the on site piping work with the service valve fully closed.

• Give sufficient protection to a pipe end (compressed and blazed, or with an

adhesive tape) so that water or foreign matters may not enter the piping.

• Bend a pipe to a radius as large as practical (R100~R150). Do not bend a pipe

repeatedly to correct its form.

• Flare connection is used between the unit and refrigerant pipe. Flare a pipe after

engaging a flare nut onto it. Flare dimensions for R410A are different from

those for conventional R407C. Although we recommend the use of flaring tools

designed specifically for R410A, conventional flaring tools can also be used by

adjusting the measurement of protrusion B with a protrusion control gauge.

• The pipe should be anchored every 1.5m or less to isolate the vibration.

• Tighten the flare joint securely with a double spanner.

• To prevent a different oil from entering, use dedicated tools, etc. to each refrigerant type. Under no circumstances must a

gauge manifold and a charge hose in particular be shared with other refrigerant types (R22, R407C, etc.).

• Use a counterflow prevention adapter to prevent vacuum pump oil from entering the refrigerant system.

• This unit contains factory charged refrigerant covering 15m of refrigerant piping and additional refrigerant charge on

the installation site is not required for an installation with up to 15m refrigerant piping.

When refrigerant piping exceeds 15m, additionally charge an amount calculated from the pipe length and the above

table for the portion in excess of 15m.

• If an existing pipe system is used, required refrigerant charge volume will vary depending on the liquid pipe size. For

further information, see “5. UTILIZATION OF EXISTING PIPING.”

* When an additional charge volume calculation result is negative, it is not necessary to charge refrigerant additionally.

• For an installation measuring 15m or shorter in pipe length, charge the refrigerant volume charged for shipment at

the factory, when you recharge refrigerant after servicing etc.

Fix both liquid and gas service valves at the valve main bodies as illustrated on the right, and then fasten them,

applying appropriate fastening torque.

Select pipes having a wall thickness larger than the specified minimum pipe thickness.

150
250
300

Run the vacuum pump for at least one hour after the vacuum

gauge shows –0.1MPa or lower. (–76cmHg or lower)

When the system has remaining moisture

inside or a leaky point, the vacuum gauge

indicator will rise.

Check the system for a leaky point and

then draw air to create a vacuum again.

Confirm that the vacuum gauge indicator does not rise even if

the system is left for one hour or more.

(Gas side)

Charge hose (Designed specifically for R410A)

Compound pressure gauge
Pressure gauge
Gauge manifold

(Designed specifically for R410A)
Handle Hi

Vacuum pump

Vacuum pump adapter

(Anti-reverse flow type)

(Designed specifically for R410A)

Charge hose

(Designed specifically for R410A)

Check joint

-0.1MPa

(-76cmHg)

Handle Lo

Service valve

(Liquid side)

Service valve cap

tightening torque (N·m)

Check joint blind nut

tightening torque (N·m)

ø6.35 (1/4")
ø12.7 (1/2")

ø15.88 (5/8")

Service valve size

(mm)

Securely tighten the service valve cap and the check joint blind nut after adjustment.

(1) Dress refrigerant pipes (both gas and liquid pipes) for heat insulation and prevention of dew condensation.

• Improper heat insulation/anti-dew dressing can result in a water leak or dripping causing damage to household effects, etc.

(2) Use a heat insulating material that can withstand 120

℃

or a higher temperature. Poor heat insulating capacity can cause heat insulation problems or cable

deterioration.

• All gas pipes must be securely heat insulated in order to prevent damage from dripping water that comes from the condensation formed on them during a cooling

operation or personal injury from burns because their surface can reach quite a high temperature due to discharged gas flowing inside during a heating operation.

• Wrap indoor units’ flare joints with heat insulating parts (pipe cover) for heat insulation (both gas and liquid pipes).

• Give heat insulation to both gas and liquid side pipes. Bundle a heat insulating material and a pipe tightly together so that no gaps may be left between them and

wrap them together with a connecting cable by a dressing tape.

• Both gas and liquid pipes need to be dressed with 20mm or thicker heat insulation materials above the ceiling where relative humidity exceeds 70%.

(1) Calculate a required refrigerant charge volume from the following table.

Formula to calculate the volume of additional refrigerant required

7) Additional refrigerant charge

Additional charge volume (g) = { Main length (m) – Factory charged volume 15 (m) } x 20 (g/m)

Model 63(21)

Additional charge volume (g) = { Main length (m) – Factory charged volume 15 (m) } x 25 (g/m)

Model 71(24), 80(28)

20
25
25

1.55
1.80
1.90

15
15
15

Model 63(21)
Model 71(24)
Model 80(28)

Put down the refrigerant volume calculated from the pipe length onto the caution label attached

on the service panel.

• Since R410A refrigerant must be charged in the liquid phase, you should charge it keeping the container

cylinder upside down or using a refrigerant cylinder equipped with a siphon tube.

• Charge refrigerant always from the liquid side service port with the service valve shut. When you find it

difficult to charge a required amount, fully open the outdoor unit valves on both liquid and gas sides and

charge refrigerant from the gas (suction) side service port, while running the unit in the cooling mode. In

doing so, care must be taken so that refrigerant may be discharged from the cylinder in the liquid phase

all the time. When the cylinder valve is throttled down or a dedicated conversion tool to change liquid

phase refrigerant into mist is used to protect the compressor, however, adjust charge conditions so that

refrigerant will gasify upon entering the unit.

• In charging refrigerant, always charge a calculated volume by using a scale to measure the charge

volume.

• When refrigerant is charged with the unit being run, complete a charge operation within 30minutes.

Running the unit with an insufficient quantity of refrigerant for a long time can cause a compressor failure.

(2) Charging refrigerant

NOTE

Additional charge volume (g)

per meter of refrigerant piping

(liquid pipe ø6.35)

Refrigerant volume charged

for shipment at the factory

(kg)

Installation’s pipe length (m)

covered without additional

refrigerant charge

The screw of the

side cover is

tightened securely.

Side cover

Do not hold the valve cap area with a spanner.

RCR012A200C

4. ELECTRICAL WIRING WORK

For details of electrical cabling, refer to the indoor unit installation manual.

4or5

1.5

Harmonized cable type

300/500 volts

Natural-and/or synth. rubber wire insulation

Polychloroprene rubber conductors insulation

Stranded core

Number of conductors

One conductor of the cable is the earth conductor

(yellow/green)

Section of copper wire (mm

)

H05RNR4G1.5 (Example) or 245IEC57

Electrical installation work must be performed by an electrical installation service provider qualified by a power provider of the country.

Electrical installation work must be executed according to the technical standards and other regulations applicable to electrical installations in the country.
• Do not use any power cable lighter than one specified in parentheses for each type below.

• braided cord (code designation 60245 IEC 51)

• ordinary tough rubber sheathed cord (code designation 60245 IEC 53)

• flat twin tinsel cord (code designation 60227 IEC 41)

Use polychloroprene sheathed flexible cord (code designation 60245 IEC57) for power

cables of parts of appliances for outdoor use.

• Ground the unit. Do not connect the grounding wire to a gas pipe, water pipe, lightning rod

or telephone grounding wire.

If improperly grounded, an electric shock or malfunction may result.

• A grounding wire must be connected before connecting the power cable. Provide a

grounding wire longer than the power cable.

• The installation of an impulse withstanding type earth leakage breaker is necessary.

A failure to install an earth leakage breaker can result in an accident such as an electric

shock or a fire.

• Do not turn on the power until the electrical work is completed.

• Do not use a condensive capacitor for power factor improvement under any circumstances.

(It dose not improve power factor, while it can cause an abnormal overheat accident)

• For power source cables, use conduits.

• Do not lay electronic control cables (remote control and signaling wires)

and other cables together outside the unit. Laying them together can

result in the malfunctioning or a failure of the unit due to electric noises.

• Fasten the cables so that those may not touch the piping, etc.

• When cables are connected, make sure that all electrical components

within the electrical component box are free of loose connector coupling

or terminal connection and then attach the cover securely. (Improper

cover attachment can result in malfunctioning or a failure of the unit, if

water penetrates into the box.)

• Never use a shield cable.

• SRC-ZRA-S, DXC-ZRA-S and SRC-YRA-S complies with the DRED

(Demand Response Enabling Devices) standard AS/NZS4755.3.1 and

supports demand response modes 1, 2, and 3 (DRM1, 2, and 3). Since

the air-conditioner limits the electric power or energy by receiving the

DRED input signal, the sense of cooling operation or heating operation

may deteriorate over time. The outdoor unit of this air-conditioner is

equipped with a terminal block for DRED input and supports ELV (Extra-

Low Voltage) complying with AS/NZS60335.1.

CAUTION

Interconnecting and

grounding wires

(minimum)

Switch breaker

Over current protector

rated capacity

Power source

(minimum)

15A, 30mA, 0.1sec or less
20A, 30mA, 0.1sec or less

30A
30A

16A
20A

2.0mm

2.5mm

1.5mm

X 4

1.5mm

X 4

Earth leakage breaker

Phase

Single-phase
Single-phase

Model 63(21)
Model 71(24), 80(28)

• The specifications shown in the above table are for units without heaters. For units with heaters, refer to the installation

instructions or the construction instructions of the indoor unit.

• Switchgear or Circuit breaker capacity which is calculated from maximum over current should be chosen along the

regulations in each country.

• The cable specifications are based on the assumption that a metal or plastic conduit is used with no more than three cables

contained in a conduit and a voltage drop is 2%. For an installation falling outside of these conditions, follow the internal

cabling regulations. Adapt it to the regulation in effect in each country.

Switchgear or Circuit Breaker

Model SRC-ZR-S

Model SRC-ZRA-S, DXC-ZRA-S, SRC-YRA-S

◎

: Standard pipe size

○

: Usable

△

: Restricted to shorter pipe length limits

Additional charge volume (g) =

{Main pipe length (m) - Length covered without additional

charge shown in the table (m)} X Additional charge volume

per meter of pipe shown in the table (g/m)

Formula to calculate additional charge volume

Are the existing units our products?

Is the existing pipe system to reuse free of corrosion, flaws or dents?

Repair the damaged parts.

Remove those branches.

Repair the damaged parts.

Check the pipe system for air tightness on the site.

Repair the damaged parts.

No loose pipe supports

YES

START

The existing pipe system is reusable.

The existing pipe system is not reusable.

Install a new pipe system.

YES

Are an outdoor unit and an indoor unit connected to the

existing pipe system to reuse?

Is the unit to install in the existing pipe system a

twin-triple-double-twin model?

Is the existing pipe system to reuse free of gas leaks?

(Check whether refrigerant charge was required frequently for

the system before)

Are heat insulation materials of the existing pipe system to

reuse free of peel-offs or deterioration?

(Heat insulation is necessary for both gas and liquid pipes)

Change the branching pipe to a specified type.

Does the existing pipe system to reuse satisfy all of the following?

(1) The pipe length is 30m or less.

(2) The pipe size conforms to the table of pipe size restrictions.

(3) The elevation difference between the indoor and outdoor units

conforms to the following restrictions.

Where the outdoor unit is above: 20m or less

Where the outdoor unit is below: 20m or less

Which of the following refrigeration oils

does the existing unit use?

Suniso, MS, Barrel Freeze, HAB, Freol,

ether oil, ester oil

Make an inquiry

for reusability.

Change

Change is impossible.

Can Use

Can not Use

Repair is impossible.

Air tightness is impossible.

Remove is impossible.

Repair is impossible.

Repair

Some loose pipe supports

Air tightness is OK

Remove

Check whether an existing pipe system is reusable or not by using the following flow chart.

Are not there any loose pipe supports?

Are there any branch pipes with no indoor unit connected?

※

If you obtain a negative figure as a result of calculation, no additional

refrigerant needs to be charged.

Example) When an SRC63 is installed in a 10m long existing pipe

system (liquid ø9.52, gas ø12.7), the quantity of refrigerant to

charge additionally should be (10m-5m) x 60g/m = 300g.

Carry out the following steps with the excising unit (in the order of (1), (2), (3) and (4))

(1) Run the unit for 30 minutes for a cooling operation.

(2) Stop the indoor fan and run the unit for 3 minutes for a cooling operation (returning liquid)

(3) Close the liquid side service valve of the outdoor unit and pump down (refrigerant recovery)

(4) Blow with nitrogen gas.

※

If discolored refrigeration oil or any foreign matters is discharged by

the blow, wash the pipe system or install a new pipe system.

• For the flare nut, do not use the old one, but use the one supplied with the outdoor unit.

Process a flare to the dimensions specified for R410A.

Wash the pipe system or install a new pipe system.

• If you choose to wash the pipe system, contact our distributor in the area.

WARNING

※

Check with the flow chart developed for a case

where an existing pipe system is reused for a

twin-triple-double-twin model published as a

technical data sheet.

Always use an earth leakage circuit breaker designed for inverter circuits to prevent

a faulty operation.

Use cables for interconnection wiring to avoid loosening of the

wires. CENELEC code for cables Required field cables.

In case of faulty wiring connection, indoor unit dose not

operate. Then, run lamp turns on and timer lamp blinks.

INSTALLATION TEST CHECK

POINTS

After installation

Power cables and connecting wires are securely fixed to the terminal block.
The power source voltage is correct as the rating.
The drain hose is fixed securely.
Service valve is fully open.
No gas leaks from the joints of the service valve.

The pipe joints for indoor and outdoor pipes have been insulated.
The reverse flow check cap is attached.
The cover of the pipe cover (A) faces downward to prevent rain from entering.
Gaps are properly sealed between the pipe covers (A) (B) and the wall surface / pipes.
The screw of the side cover is tightened securely.

Check the following points again after completion of the

installation, and before turning on the power. Conduct a test run

again and ensure that the unit operates properly.

Explain to the customer how to use the unit and how to take care

of the unit following the instruction manual.

5. UTILIZATION OF EXISTING PIPING

Main fuse specification

250V 20A

Specification

Part No.

SSA564A136A

Liquid pipe

Gas pipe

Usability

Maximum one-way pipe length

Length covered without additional charge

Pipe size

Additional charge volume per meter of pipe

25g/m

ø6.35

ø15.88

◎

30
15

Model 71(24), 80(28)

60g/m

ø9.52

ø15.88

△

20g/m

ø6.35
ø12.7

◎

30
15

Model 63(21)

60g/m

ø9.52
ø12.7

△

• Consult with our distributor

in the area, if you need to

recover refrigerant and

charge it again.

• Any combinations of pipe

sizes not listed in the table

are not usable.

Model 63(21)

Model 71(24), 80(28)

Use a torque wrench.

If a torque wrench is

not available, fasten

the flare nut manually

first and then tighten

it further, using the

left table as a guide.

Model 71(24), 80(28)

Grommet

Clearance

3. DRAIN PIPING WORK

• Execute drain piping by using a drain elbow and drain grommets

supplied separately as accessories, where water drained from the

outdoor unit is a problem.

• Water may drip where there is a larger amount of drain water. Seal

around the drain elbow and drain grommets with putty or

adequate caulking material.

• Condensed water may flow out from vicinity of service valve or

connected pipes.

• Where you are likely to have several days of sub-zero temperatures

in a row, do not use a drain elbow and drain grommets. (There is a

risk of drain water freezing inside and blocking the drain.)

• When condensed water needs to be led to a drain, etc.,

install the unit on a flat base (supplied separately as a

locally procured part) or concrete blocks.

Then, secure space for the drain elbow and the drain

hose.

Do not put a grommet on

this hole.

This is a supplementary

drain hole to discharge

drain water, when a large

amount of it is gathered.

Drain elbow

Grommet

Drain hose

(To be procured on the installer’s part)

CAUTION

Wiring diagram

• It holds cables in place and protect the terminal connection

from external force.

• This clamp is for the cable in the outside diameter 9

15mm.

Adjust it when it is not suitable.

• It has stuck on the lid of a control box.

Cable clamp

Indoor - Outdoor

connecting wire

Power cable

DRED cable

(Demand response

enabling devices)

• Earth wire shall

be Yellow/Green

(Y/G) in color

and longer than

other AC wires

for safety reason.

Model 63(21)

Power cable, indoor-outdoor connecting wires

• Always perform grounding system installation work with the power cable unplugged.

• Connect a pair bearing a common terminal number with an indoor-outdoor connecting wire.

• In cabling, fasten cables securely with cable clamps so that no external force may work on terminal connections.

• Grounding terminals are provided in the terminal block.

• Use Polychloroprene sheathed flexible cord (code designation 60245 IEC57, IEC60335-2-40) with cross-

sectional area of 2.0 or 2.5 mm

for power cable of outdoor unit.

N L

1 2/N 3

Safety

breaker

Earth

leakage

circuit

breaker

Earth

Power source

Indoor unit

Outdoor unit

Model SRC-ZR-S

N L

D1 D2 D3

Safety

breaker

Earth

leakage

circuit

breaker

Power source

DRED*

Outdoor unit

1 2/N 3

Indoor unit

Model SRC-ZRA-S, DXC-ZRA-S, SRC-YRA-S

When wire length exceeds
30m, use 2.5mm

wires.

When wire length exceeds
30m, use 2.5mm

wires.

*Demand

response

enabling

devices

D2 D3

Connecting cable between outdoor unit and DRED shall be double insulation layer, polychloroprene sheathed (>50V)
with size 4 x (0.5mm

to 2.0mm

) cable or flexible cord, where the maximum allowable length is 30m.

(POWER CABLE)

CENELEC code for cables requiring fields cables.

H05RNR3G2.0 [MODEL 63(21)]

H05RNR3G2.5 [MODEL 71(24), 80(28)]

Power source terminal block

Power cable, indoor - outdoor connecting wire circuit diagram