ActronAir MULTIELITE MRC-052AS-2 User manual

IMPORTANT NOTE:
Please read this manual carefully before installing or operating your new air conditioning unit and keep it available for future
reference. This owner’s manual only refers to use of the outdoor unit. When using the indoor unit, refer to the owner’s
manual for the indoor unit.
INSTALLATION MANUAL
Model Numbers:
MRC-052AS-2
MRC-071AS-3
MRC-100AS-4
MRC-110AS -5
MRC-135AS -5
Multi Split System Air Conditioner
That’s better. That’s Actron.

Safety Precautions ......................................................................... 04
Installation Overview ..................................................................... 06
Components .................................................................................. 05
1
2
3
Table of Contents
Installation Manual
Refrigerant Piping Connection ...................................................... 11
4
Wiring ........................................................................................... 12
5
Leak Test and Air Evacuation ............... ......................................... 22
6
Test Run ....................................................................................... 26
8
Function of Automatic Wiring/Piping Connection ...................... 27
9
Electrical & Gas Leak Checks ........................................................ 25
7
Maintenance ................................................................................ 28
10
Page 2

This manual is a controlled document which contains confidential and proprietary information.
Distribution, modification, copying and/or reproduction are prohibited without written consent from ActronAir
Product design and specifications are subject to change without prior notice for product improvement.
Page 3
READ SAFETY PRECAUTIONS BEFORE INSTALLATION
Incorrect installation due to ignoring instructions can cause serious damage or injury. The seriousness of
potential damage or injuries is classified as either a WARNING or CAUTION.
WARNING
Failure to observe a warning may result in death or serious injury. The appliance must be
installed in accordance with national regulations
Failure to observe a caution may result in injury or equipment damage.
CAUTION
Note about Fluorinated Gases
1. This air conditioning unit contains fluorinated gas. For specific information on the type of gas and the amount,
please refer to the relevant label on the unit itself.
2. Installation, service, maintenance and repair of this unit must be performed by a qualified HVAC technician.
3. Product uninstallation and recycling must be performed by a qualified HVAC technician.
4. When the unit is checked for leaks, proper record-keeping of all checks is strongly recommended.
MUST BE INSTALLED BY A
LICENSED ELECTRICIAN
D I Y
DIY
DIY
ALL ELECTRICAL WORK
MUST BE PERFORMED
BY A LICENSED ELECTRICIAN
FOR COMPLIANCE WITH
QUEENSLAND ELECTRICAL SAFETY
REGULATIONS 2013
This refers to electrical works only

Page 4
1. Safety Precautions Multi Split System
CAUTION
Do not install the unit in a location that may be exposed to combustible gas leaks. If combustible gas accumulates
around the unit, it may cause fire.
Do not install your air conditioner in a wet room such as a bathroom or laundry room. Too much exposure to water
can cause electrical components to short circuit.
1. The product must be properly grounded at the time of installation, or electrical shock may occur.
2. Install drainage piping according to the instructions in this manual. Improper drainage may cause water damage to
your home and property.
SAFETY INSTRUCTIONS
1. Prevailing WH&S regulations must be observed and will take precedence to the safety instructions contained on
this manual. Safe work practices and environment must be the paramount importance in the performance of all the
service procedures.
2. Ensure that unit installation complies with relevant council regulations and building code standards.
3. All electrical wiring must be in accordance with current electrical authority regulations and all wiring connections to
be as per electrical diagram provided.
4. Always wear appropriate PPE, remove any dangling jewellery and protect long hair by wearing a cap.
5. Make sure that safety guards and panel covers are always firmly secured and not damaged.
6. This appliance is not intended for use by young children or infirm persons unless they have been adequately
supervised by a responsible person to ensure that they can use the appliance safely. Young children should be
supervised to ensure that they do not play with the appliance.
7. Installer must incorporate a means of electrical disconnection (isolator) in the sub mains fixed wiring in accordance
with the Australian wiring rule (AS3000).
8. Secure the power cords and control cables that goes in/out the unit. Use the cable ties provided in the control box.
WARNING
1. Carefully read all the Safety Precautions before installation.
2. In certain functional environments, such as kitchens, server rooms, etc., the use of specially designed
air-conditioning units is highly recommended.
3. Only qualified HVAC technicians* should install, repair and service this air conditioning unit. Improper service or
alteration by unqualified technician could result in significant and major damage to the product or property which
may render your warranty null and void. Such unqualified service could also lead to severe physical injury or death.
Follow all safety instructions in this literature and all warning labels that are attached to the equipment.
4. During installation, ensure there are no refrigerant leaks. Refrigerant is toxic and poses a serious health and safety risk.
*Qualifications required will be appropriate Electrical, Refrigeration and Refrigerant
Handling License & Training, dependent on local State/Territory regulations.

Page 5
2. Components Multi Split System
The air conditioning system comes with the following components. Use all of the installation parts and accessories to install
the air conditioner. Improper installation may result in water leakage, electrical shock and fire, or cause the equipment to
fail.
Name Shape Quantity
Drain joint (some models) 1
Seal ring (some models) 1
Pipe Adaptor
(NOTE: Pipe size may differ from appliance to
appliance. To meet the different pipe size requirements,
sometimes the pipe connections need the adaptor to
be installed to the outdoor unit.)
Model Adaptor Quantity
MRC-052AS-2 Ø9.52 - Ø12.7 2
MRC-071AS-3
Ø9.52 - Ø12.7 2
Ø9.52 - Ø15.9 1
Ø6.35 - Ø9.52 1
MRC-100AS-4
Ø12.7 - Ø9.52 1
Ø12.7 - Ø15.9 1
Ø9.52 - Ø15.9 1
Ø9.52 - Ø12.7 1
MRC-110AS-5
Ø12.7 - Ø9.52 1
Ø9.52 - Ø12.7 3
Ø12.7 - Ø15.9 1
MRC-135AS-5
Ø6.35 - Ø9.52 2
Ø12.7 - Ø9.52 2
Ø12.7 - Ø15.9 2
Owner’s manual 1
Installation manual 1
Optional Accessories
There are two types of controllers: wall controller(wired) and remote controller (wireless).
Select a controller according to customers request and install in an appropriate place.
Refer to catalogues and technical literature for selecting a suitable controller, for the indoor unit used.

Page 6
1(L) 2(N) S
3
4
Leak test and evacuate the
refrigeration system
1 2
3. Installation Overview Multi Split System
Installation Overview
Install the outdoor unit Connect the refrigerant pipes and
perform Leak test
Perform a test run
CAUTION
• A minimum pipe run of 6 metres is recommended to minimise vibration & excessive noise.
5
Connect the wires

Page 7
3. Installation Overview Multi Split System
Indoor units that can be used in combination number of connected units 1-5
Compressor stop start frequency stop time 3 min or more
Power source voltage
voltage supply 230VAC (-6%/+10%)
voltage drop during start 5% of rated
Table 3.1
Specification
1 outdoor
2 indoor 3 indoor 4 indoor 5 indoor
Minimum Field Pipe Length (m) - 1 indoor unit 6 9 12 15
Maximum length for all rooms (m) 30 60 60 60
Maximum length for one indoor unit (m) 25 30 35 35
Maximum height difference
between indoor and
outdoor unit (m)
OU higher than IU 15 15 15 15
OU lower than IU 15 15 15 15
Maximum height difference between indoor units (m) 10 10 10 10
When installing multiple indoor units to a single outdoor unit, ensure that the lenght of te refrigerant pipe and the height difference
between the indoor and outdoor and indoor to indoor units meet the following requirements:
Table 3.2
Indoor unit
Indoor unit
Indoor unit
Outdoor unit
15m(max)
15m(max)
10m(max)

Page 8
3. Installation Overview Multi Split System
Step 1: Select installation location
The outdoor unit should be installed in the location that
meets the following requirements:
þPlace the outdoor unit as close to the indoor unit as
possible.
þEnsure that there is enough room for installation and
maintenance.
þThe air inlet and outlet must not be obstructed or
exposed to strong wind
þEnsure the location of the unit will not be subject to
snowdrifts, accumulation of leaves or other seasonal
debris. If possible, provide an awning for the unit.
Ensure the awning does not obstruct airflow.
þThe installation area must be dry and well ventilated.
þThere must be enough room to install the connecting
pipes and cables and to access them for maintenance.
Step 2: Install Outdoor Unit
Fix the outdoor unit with anchor bolts (M10)
Strong wind
Strong wind
Fig. 3.1
þThe area must be free of combustible gases and
chemicals
þThe pipe length between the outdoor and indoor unit
may not exceed the maximum allowable pipe length.
þIf possible, DO NOT install the unit where it is exposed
to direct sunlight.
þIf possible, make sure the unit is located far away from
your neighbours’ property so that the noise from the
unit will not disturb them.
þIf the location is exposed to strong winds (for
example: near a seaside), the unit must be placed
against the wall to shelter it from the wind. If
necessary, use an awning. Ensure minimum space
requirements are met. (See Fig. 3.1 & 3.2)
þInstall the indoor and outdoor units, cables and wires
at least 1 metre from televisions or radios to prevent
static or image distortion. Depending on the radio
waves, a 1 metre distance may not be enough to
eliminate all interference.
Fig. 3.2
Strong wind
Wind Baffle
CAUTION
 Be sure to remove any obstacles that may block air
circulation.
 Make sure you refer to Fig. 3.7 to ensure there is
enough room for installation and maintenance.
Fig. 3.3
>60cm
Fix with bolts
Outdoor Unit Installation Instructions

Page 9
3. Installation Overview Multi Split System
Table 3.3
Dimensions of Multi Split Outdoor Unit (mm)
Model Number
Outdoor Unit
Dimensions
W x H x D (mm)
Mounting Dimensions
Distance A
(mm)
Distance B
(mm)
MRC052AS-2
MRC-071AS-3 845 x 702 x 363 540 350
MRC-100AS-4
MRC-110AS-5 946 x 810 x 410 673 403
MRC-135AS-5 952 x 1333 x 415 634 404
Outdoor Unit Installation Instructions
A
B
D
W
H
W
H
Fig. 3.4
Fig. 3.5
Fig. 3.6
Fig. 3.7
NOTE
The minimum distance between the outdoor unit
and walls described in the installation guide does
not apply to airtight rooms. Be sure to keep the unit
unobstructed in at least two of the three directions
(M, N, P). See Fig 3.7
600mm or more
(P)
150mm or more
600mm or more
(N)
300mm or more
(M)
600mm or more
(service space)

Page 10
Fig. 3.9
Overview
3. Installation Overview Multi Split System
Notes On Drilling Hole In Wall
You must drill a hole in the wall for the refrigerant piping,
and the signal cable that will connect the indoor and
outdoor units.
1. Determine the location of the wall hole based on the
location of the outdoor unit.
2. Using a 65mm core drill, drill a hole in the wall.
3. Place the protective wall cuff in the hole. This protects
the edges of the hole and will help seal it when you
finish the installation process.
NOTE
When drilling the wall hole, make sure to avoid wires,
plumbing, and other sensitive components.
Connecting 7kW Indoor Unit
The 7kW indoor unit can only be connected to the A port,
if there are two 7kW indoor units, they can be connected
to A and B port. (See Fig. 3.9). Please use pipe adaptors
provided.
Indoor Unit Capacity Liquid
(mm)
Gas
(mm)
2.6kW 6.35mm 9.52mm
3.5kW / 5kW 6.35mm 12.7mm
7kW 9.52mm 15.88mm
Table 3.4
Connecting pipe size of indoor unit
Fig. 3.8
Drain Joint Installation
Before bolting the outdoor unit in place, you must install
the drain joint at the bottom of the unit. (See Fig. 3.8).
1. Fit the rubber seal on the end of the drain joint that will
connect to the outdoor unit.
2. Insert the drain joint into the hole in the base pan of the
unit.
3. Rotate the drain joint 90° until it clicks in place facing
the front of the unit.
4. Connect a drain hose extension (not included) to the
drain joint to redirect water from the unit during heating
mode.
NOTE
Make sure the water drains to a safe location where it
will not cause water damage or a slipping hazard.
Seal
Drain joint
Base pan hole of
outdoor unit
Seal

Page 11
4. Refrigerant Pipe Connection Multi Split System
Safety Precautions
WARNING
• All field piping must be completed by a qualified HVAC technician and must comply with local and national
regulations.
• When the air conditioner is installed in a small room, measures must be taken to prevent the refrigerant
concentration in the room from exceeding the safety limit in the event of refrigerant leakage. If the refrigerant
leaks and its concentration exceeds its proper limit, hazards due to lack of oxygen may result.
• When installing the refrigeration system, ensure that air, dust, moisture or foreign substances do not enter
the refrigerant circuit. Contamination in the system may cause poor operating capacity, high pressure in the
refrigeration cycle, explosion, injury or product failure and may void warranty.
• Ventilate the area immediately if there is refrigerant leakage during the installation. Leaked refrigerant gas can be
toxic. Ensure there is no refrigerant leakage after completing the installation work.
Ensure that the length of the refrigerant pipe, the number
of bends, and the drop height between the indoor and
outdoor units meets the requirements shown in Table 3.2.
Notes On Pipe Length and Elevation
Refrigerant Piping Connection Instructions
1. Cut the connecting pipes according to required length.
2. Remove burrs in the pipe. Burrs can affect the air-tight
seal of refrigerant piping connections.
3. Place flare nuts on both ends of pipe. Flare each end of
connecting pipes.
4. Connect the pipe to indoor and outdoor unit. Apply a
thin coat of refrigeration oil to the flared end of the
pipe. Tighten the flare nuts using a spanner and torque
wrench.
Flare nut
Copper
pipe
Unit tubing Flare nut Pipe
Fig. 7.1
Fig. 7.2
CAUTION
 Ensure to wrap insulation around the piping. Direct
contact with the bare piping may result in burns or
frostbite.
 Make sure the pipe is properly connected. Over
tightening may damage the bell mouth and under
tightening may lead to leakage.
Pipe
Size
Tightening
Torque
Flare
Dimension (A) Flare Shape
Min
(mm)
Max
(mm)
 6.4 14.2 - 17.2 Nm 8.3 8.3
 9.5 32.7 - 39.9 Nm 12.4 12.4
 12.7 49.5 - 60.3 Nm 15.4 15.8
Table 4.1
Pipe Flare Dimension and Tightening Torque Guide
Fig. 4.1

Page 12
5. Wiring Multi Split System
Safety Precautions
WARNING
• Be sure to isolate the power supply before working on the unit.
• All electrical wiring must be done according to local and national regulations.
• Electrical wiring must be done by qualified technician. Improper connections may cause electrical malfunction,
injury and fire.
• Connect the power cable to the terminals and fasten it with a clamp. An insecure connection may cause fire.
• Make sure that all wiring is done correctly and the control board cover is properly installed. Failure to do so can cause
overheating at the connection points, fire, and electrical shock.
CAUTION
 Connect the outdoor wires before connecting the
indoor wires.
 Make sure you earth the unit. Improper earthing
may cause electrical shock.
 Insulate both the gas and liquid piping to prevent
water leakage.
 DO NOT connect the unit with the power source until
all wiring and piping is completed.
 Make sure that you do not cross your electrical wiring
with your signal wiring, as this can cause distortion and
interference.
Follow these instructions to prevent interference when the
compressor starts:
• The unit must be connected to a separate sub circuit.
• No other equipment should be connected to the same
same sub circuit.
• The unit’s power information can be found on the rating
sticker on the product.
1. Prepare the cable for connection
a. Ensure the correct size cable has been selected, as
per specifications.
b. Using wire strippers, strip the rubber jacket from
both ends of signal cable.
c. Strip the insulation from the ends of the wires.
d. Using a wire crimper, crimp fork-lugs on the ends of
the wires.
Outdoor Wiring
WARNING
Before performing any electrical or wiring work, isolate
and lock out/tag out power to the A/C unit.
NOTE
While connecting the wires, please strictly follow the
wiring diagram (found inside the electrical box cover).
2. Remove the electric cover of the outdoor unit. If there
is no cover on the outdoor unit,disassemble the bolts
from the maintenance board and remove the
protection board. (See fig 4.1)
3. Connect the fork lugs to the terminals. Match the wire
colours / labels with the labels on the terminal block,
and firmly screw the lug of each wire to its
corresponding terminal.
4. Clamp down the cable with designated cable clamp.
5. Reinstall the cover of the electric control box.
Fig. 5.1
Screws
Cover

Page 13
5. Wiring Multi Split System
Wiring Diagram MRC-052AS-2
OUTDOOR WIRING DIAGRAM - MULTI ELITE
MRC-052AS-2 STANDARD
R
This drawing remains the intellectual property of Actron Engineering Pty Ltd. Reproduction, modification and/or distribution are prohibited without written consent.
Revision
Description:
C
WD3005
Rev. Description Date
By
PCR
ORIGINAL A4
Size:
Base Model No:
Variation:
Variation Code:
A
Drawing No:
Drawn: Date:31-07-2017
NDL
Approved: Date:
BReviseID and OD cable specs. Change text rotation. LC 15/03/2018
WG 05-04-2018
CReviseID and OD cable specs. Change text rotation. WG 27/02/2019

Page 14
5. Wiring Multi Split System
Wiring Diagram MRC-071AS-3
MRC-071AS-3 MRC-075AS-3 STANDARD
R
This drawing remains the intellectual property of Actron Engineering Pty Ltd. Reproduction, modification and/or distribution are prohibited without written consent.
Revision
Description:
C
WD3006
Rev. Description Date
By
PCR
ORIGINAL A4
Size:
Base Model No:
Variation:
Variation Code:
A
Drawing No:
Drawn: Date: 31-07-2017
NDL
Approved: Date:
OUTDOOR WIRING DIAGRAM - MULTI ELITE
BReviseID and OD cable specs. Change text rotation. LC 15/03/2018
WG 05-04-2018
CRevise the cable specs back to original. WG 23/01/2019

Page 15
5. Wiring Multi Split System
Wiring Diagram MRC-100AS-4
STANDARD
R
This drawing remains the intellectual property of Actron Engineering Pty Ltd. Reproduction, modification and/or distribution are prohibited without written consent.
Revision
Description:
C
WD3007
Rev. Description Date
By
PCR
ORIGINAL A4
Size:
Base Model No:
Variation:
Variation Code:
A
Drawing No:
Drawn: Date: 31-07-2017
NDL
Approved: Date:
OUTDOOR WIRING DIAGRAM - MULTI ELITE
MRC-100AS-4
BReviseID and OD cable specs. Change text rotation. LC 15/03/2018
WG 05-04-2018
CRevise the cable specs back to original. WG 23/01/2019

Page 16
5. Wiring Multi Split System
Wiring Diagram MRC-110AS-5
OUTDOOR WIRING DIAGRAM - MULTI ELITE
MRC-110AS-5 STANDARD
R
This drawing remains the intellectual property of Actron Engineering Pty Ltd. Reproduction, modification and/or distribution are prohibited without written consent.
Revision
Description:
C
WD3008
Rev. Description Date
By
PCR
ORIGINAL A4
Size:
Base Model No:
Variation:
Variation Code:
A
Drawing No:
Drawn: Date: 31-07-2017
NDL
Approved: Date:
BReviseID and OD cable specs. Change text rotation. LC 16/03/2018
WG 05-04-2018
CRevise the cable specs back to original. WG 23/01/2019

Page 17
5. Wiring Multi Split System
Wiring Diagram MRC-135AS-5
OUTDOOR WIRING DIAGRAM - MULTI ELITE
MRC-135AS-5 STANDARD
R
This drawing remains the intellectual property of Actron Engineering Pty Ltd. Reproduction, modification and/or distribution are prohibited without written consent.
Revision
Description:
C
WD3009
Rev. Description Date
By
PCR
ORIGINAL A4
Size:
Base Model No:
Variation:
Variation Code:
A
Drawing No:
Drawn: Date: 31-07-2017
NDL
Approved: Date:
BReviseID and OD cable specs. Change text rotation. LC 16/03/2018
05-04-2018
WG
CRevise the cable specs back to original. WG 23/01/2019

Page 18
Field Wiring Connection
5. Wiring Multi Split System
CAUTION
Connect the field wirings to the terminals as specified on the terminal block of indoor and outdoor units.
MRC-052AS-2 Connecting Diagram
Magnetic Ring (supplied, on selected
outdoor models). Clip this around the
connecting wires during installion.
MRC-071AS-3 Connecting Diagram
Serene / Mini Cassete Bulkhead
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
MRC-052AS-2
SERENE / MINI CASSETTE BULKHEAD
1(L) 2(N) S 1(L) 2(N) S
L(A) N(A) S(A) L(B) N(B) S(B) L(A) N(A) S(A) L(B) N(B) S(B)
N(L2) SL(L1) N(L2) SL(L1)
LN
OUTDOOR
MAINS
TO UNIT A
MRC-075AS-3
BULKHEAD
TO UNIT B TO UNIT C
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B TO UNIT C
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C)
1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1)
SERENE / MINI CASSETTE
LN
OUTDOOR
MAINS
TO UNIT A
MRC-100AS-4
BULKHEAD
TO UNIT B TO UNIT C
LN
OUTDOOR
MAINS
TO UNIT A
TO UNIT D TO UNIT B TO UNIT C TO UNIT D
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D) L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D)
1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1)
SERENE / MINI CASSETTE
MRC-110AS-5 / MRC-135AS-5
BULKHEAD
TO UNIT C TO UNIT D TO UNIT E TO UNIT C TO UNIT D TO UNIT E
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D) L(E) N(E) S(E) L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D) L(E) N(E) S(E)
1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1)
SERENE / MINI CASSETTE
Serene / Mini Cassete
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
MRC-052AS-2
SERENE / MINI CASSETTE BULKHEAD
1(L) 2(N) S 1(L) 2(N) S
L(A) N(A) S(A) L(B) N(B) S(B) L(A) N(A) S(A) L(B) N(B) S(B)
N(L2) SL(L1) N(L2) SL(L1)
LN
OUTDOOR
MAINS
TO UNIT A
MRC-075AS-3
BULKHEAD
TO UNIT B TO UNIT C
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B TO UNIT C
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C)
1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1)
SERENE / MINI CASSETTE
LN
OUTDOOR
MAINS
TO UNIT A
MRC-100AS-4
BULKHEAD
TO UNIT B TO UNIT C
LN
OUTDOOR
MAINS
TO UNIT A
TO UNIT D TO UNIT B TO UNIT C TO UNIT D
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D) L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D)
1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1)
SERENE / MINI CASSETTE
MRC-110AS-5 / MRC-135AS-5
BULKHEAD
TO UNIT C TO UNIT D TO UNIT E TO UNIT C TO UNIT D TO UNIT E
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D) L(E) N(E) S(E) L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D) L(E) N(E) S(E)
1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1)
SERENE / MINI CASSETTE
Bulkhead

Page 19
5. Wiring Multi Split System
MRC-100AS-4 Connecting Diagram
Serene / Mini Cassete Bulkhead
MRC-110AS-5 and MRC-135-5 Connecting Diagram
Serene / Mini Cassete
Bulkhead
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
MRC-052AS-2
SERENE / MINI CASSETTE BULKHEAD
1(L) 2(N) S 1(L) 2(N) S
L(A) N(A) S(A) L(B) N(B) S(B) L(A) N(A) S(A) L(B) N(B) S(B)
N(L2) SL(L1) N(L2) SL(L1)
LN
OUTDOOR
MAINS
TO UNIT A
MRC-075AS-3
BULKHEAD
TO UNIT B TO UNIT C
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B TO UNIT C
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C)
1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1)
SERENE / MINI CASSETTE
LN
OUTDOOR
MAINS
TO UNIT A
MRC-100AS-4
BULKHEAD
TO UNIT B TO UNIT C
LN
OUTDOOR
MAINS
TO UNIT A
TO UNIT D
TO UNIT B TO UNIT C TO UNIT D
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D)
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D)
1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S
N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1)
SERENE / MINI CASSETTE
MRC-110AS-5 / MRC-135AS-5
BULKHEAD
TO UNIT C TO UNIT D TO UNIT E TO UNIT C TO UNIT D TO UNIT E
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D) L(E) N(E) S(E) L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D) L(E) N(E) S(E)
1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1)
SERENE / MINI CASSETTE
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
MRC-052AS-2
SERENE / MINI CASSETTE BULKHEAD
1(L) 2(N) S 1(L) 2(N) S
L(A) N(A) S(A) L(B) N(B) S(B) L(A) N(A) S(A) L(B) N(B) S(B)
N(L2) SL(L1) N(L2) SL(L1)
LN
OUTDOOR
MAINS
TO UNIT A
MRC-075AS-3
BULKHEAD
TO UNIT B TO UNIT C
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B TO UNIT C
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C)
1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1)
SERENE / MINI CASSETTE
LN
OUTDOOR
MAINS
TO UNIT A
MRC-100AS-4
BULKHEAD
TO UNIT B TO UNIT C
LN
OUTDOOR
MAINS
TO UNIT A
TO UNIT D
TO UNIT B TO UNIT C TO UNIT D
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D)
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D)
1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S
N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1)
SERENE / MINI CASSETTE
MRC-110AS-5 / MRC-135AS-5
BULKHEAD
TO UNIT C TO UNIT D TO UNIT E TO UNIT C TO UNIT D TO UNIT E
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D) L(E) N(E) S(E) L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D) L(E) N(E) S(E)
1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1)
SERENE / MINI CASSETTE
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
MRC-052AS-2
SERENE / MINI CASSETTE BULKHEAD
1(L) 2(N) S 1(L) 2(N) S
L(A) N(A) S(A) L(B) N(B) S(B) L(A) N(A) S(A) L(B) N(B) S(B)
N(L2) SL(L1) N(L2) SL(L1)
LN
OUTDOOR
MAINS
TO UNIT A
MRC-075AS-3
BULKHEAD
TO UNIT B TO UNIT C
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B TO UNIT C
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C)
1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1)
SERENE / MINI CASSETTE
LN
OUTDOOR
MAINS
TO UNIT A
MRC-100AS-4
BULKHEAD
TO UNIT B TO UNIT C
LN
OUTDOOR
MAINS
TO UNIT A
TO UNIT D TO UNIT B TO UNIT C TO UNIT D
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D) L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D)
1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1)
SERENE / MINI CASSETTE
MRC-110AS-5 / MRC-135AS-5
BULKHEAD
TO UNIT C TO UNIT D TO UNIT E
TO UNIT C TO UNIT D TO UNIT E
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D) L(E) N(E) S(E)
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D) L(E) N(E) S(E)
1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S
N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1)
SERENE / MINI CASSETTE
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
MRC-052AS-2
SERENE / MINI CASSETTE BULKHEAD
1(L) 2(N) S 1(L) 2(N) S
L(A) N(A) S(A) L(B) N(B) S(B) L(A) N(A) S(A) L(B) N(B) S(B)
N(L2) SL(L1) N(L2) SL(L1)
LN
OUTDOOR
MAINS
TO UNIT A
MRC-075AS-3
BULKHEAD
TO UNIT B TO UNIT C
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B TO UNIT C
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C)
1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1)
SERENE / MINI CASSETTE
LN
OUTDOOR
MAINS
TO UNIT A
MRC-100AS-4
BULKHEAD
TO UNIT B TO UNIT C
LN
OUTDOOR
MAINS
TO UNIT A
TO UNIT D TO UNIT B TO UNIT C TO UNIT D
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D) L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D)
1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1)
SERENE / MINI CASSETTE
MRC-110AS-5 / MRC-135AS-5
BULKHEAD
TO UNIT C TO UNIT D TO UNIT E
TO UNIT C TO UNIT D TO UNIT E
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
LN
OUTDOOR
MAINS
TO UNIT A TO UNIT B
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D) L(E) N(E) S(E)
L(A) N(A) S(A) L(B) N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D) L(E) N(E) S(E)
1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S 1(L) 2(N) S
N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1) N(L2) SL(L1)
SERENE / MINI CASSETTE
Magnetic Ring (supplied, on selected
outdoor models). Clip this around the
connecting wires during installion.

Page 20
5. Wiring Multi Split System
CAUTION
After the confirmation of the above conditions, prepare the wiring as follows:
 Separate isolator (sub-circuit) must be installed for each air-conditioning system. Make sure to follow the wiring
diagram provided with unit (back of control cover).
 During transport, screws in terminal block may become loose due to handling and vibrations. Check the connections
and tightened the screw if necessary.
 Ensure the voltage supply is within the required specification 230VAC (-6%/+10%) .
Suggested minimum cable size should be used as a guide only, refer to AS/NZS 3000 "Australian/New Zealand Wiring
Rule" for more details.
Circuit Breaker Size & Amps (Main Power Supply)
1. Compute the total FLA of all the installed equipment (outdoor + the combined indoor units) using the table below:
Example: MRC-135AS-5 + 2x WRE-026AS + 2x BRE-035BS + 1x MRE-035AS
Total System FLA = 25.8 + 2(0.24) + 2(1.2) + 1(0.57) = 29.25A
Full Load Amps Table
Model MRC-052AS-2 MRC-071AS-3 MRC-100AS-4 MRC-110AS-5 MRC-135AS-5
FLA (Outdoor Unit) 14.0 15.8 16.0 21.0 25.8
Model WRE-026AS WRE-035AS WRE-050AS WRE-071AS BRE-026BS
FLA (Indoor Unit) 0.24 0.275 0.275 0.4 1.2
Model BRE-035BS BRE-050BS BRE-071BS MRE-035AS MRE-0520AS
FLA (Indoor Unit) 1.2 1.5 1.5 0.57 0.57
2. From the calculated system total FLA, use the table below to determine cable sizes and system circuit breaker size:
Example: Total System FLA = 28.71A will require 6.0mm (Supply Mains), 1.0mm (OD to ID wire) and 32A CB fuse.
Total FLA Range 20A and less >20A to 25A >25A to 32A
Outdoor Unit Cable Size (Supply Mains) 2.5 4.0 6.0
Indoor Unit Cable Size (Outdoor to Indoor wire) 1.0 1.0 1.0
Circuit Breaker Size 20A 25A 32A
NOTES: Cable sizes are suggested minimum and should be used as a guide only.
Refer to AS/NZS 3000 "Australian Wiring Rules" for more details.
Wires, circuit breaker and fuses are NOT supplied with the units, installer has to provide.