Mars COMFORT-AIRE Century VMH 9 SU Series User manual

Service Manual
VMH 9/12/18/24 SU Series
VMH 30/36 SD Series
Inverter Single Zone
Ductless Mini-Split
www.marsdelivers.com

CONTENTS
1. Precaution.......................................................................................................... 1
1.1 Safety Precaution ......................................................................................... 1
1.2 Warning......................................................................................................... 1
2. Part Names and Functions ............................................................................... 3
2.1 Model Names of Indoor/Outdoor Units ......................................................... 3
2.2 Part Names of Indoor/Outdoor Units ............................................................ 4
3. Dimension .......................................................................................................... 5
3.1 Indoor Unit .................................................................................................... 5
3.2 Outdoor Unit ................................................................................................. 7
4. Refrigerant Cycle Diagram ............................................................................... 8
5 Wiring Diagram .................................................................................................. 9
6. Installation Details............................................................................................. 9
6.1 Wrench Torque Sheet for Installation............................................................ 9
6.2 Connnecting the Cables ............................................................................... 9
6.3 Pipe Length and the Elevation...................................................................... 9
6.4 Initial Installation ......................................................................................... 10
6.5 Adding the Refrigerant After Running the System for Many Years ............. 10
6.6 Re-installation if the Indoor Unit Has Been Repaired ..................................11
6.7 Re-installation After Outdoor Unit Has Been Repaired................................11
7. Operation Characteristics............................................................................... 13
8. Electronic Function......................................................................................... 14
8.1 Abbreviation ................................................................................................ 14
8.2 Display Functions ....................................................................................... 14
8.3 Main Protection........................................................................................... 15
8.4 Operation Modes and Functions................................................................. 16
9. Troubleshooting .............................................................................................. 21
9.1 Indoor Unit Error Display ............................................................................ 22
9.2 Outdoor Unit Error Display.......................................................................... 23
9.3 Diagnosis and Solution ............................................................................... 26
10. Disassembly Instructions.............................................................................. 55
10.1 Indoor Unit................................................................................................. 55
10.2 Outdoor Unit.............................................................................................. 59

Service Manual - VMH 9/12/18/24 SU & VMH30/36S D Series
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1. Precaution
1.1 Safety Precaution
To prevent injury and property
damage, these instructions must
be followed.
Incorrect operation due to
ignoring instructions will cause
harm or damage.
Before servicing the unit, be sure
to read service manual.
1.2 Warning
INSTALLATION
Do not use a defective or
underrated circuit breaker. Use this
appliance on a dedicated circuit.
There is risk of fire or electric shock.
For electrical work, contact the
dealer, seller, a qualified electrician,
or an authorized service center.
Do not disassemble or repair this
product, there is risk of fire or electric
shock.
Always ground this product.
There is risk of fire or electric shock.
Install panel and cover of control
box securely.
There is risk of fire or electric shock.
Always install a dedicated circuit
and breaker.
Improper wiring or installation may
cause electric shock.
Use the correctly rated breaker or
fuse.
There is risk of fire or electric shock.
Do not modify or extend the power
cable.
There is risk of fire or electric shock.
Do not install, remove, or reinstall
the unit by yourself (customer).
There is risk of fire, electric shock,
explosion, or injury.
Use caution when unpacking and
installing the product.
Sharp edges could cause injury, be
especially careful of the case edges
and the fins on the condenser and
evaporator.
For installation, always contact the
dealer or an authorized service
center.
Do not install this product on a
defective installation stand.
Be sure the installation area does
not deteriorate with age.
If the base collapses, the air
conditioner could fall with it, causing
property damage, product failure, and
personal injury.
Do not let the air conditioner run
for a long time when the humidity
is very high and a door or a
window is left open.
Take care to ensure that power
cable cannot be pulled out or
damaged during operation. There is
risk of fire or electric shock.
Do not place anything on the
power cable.
There is risk of fire or electric shock.
Do not plug or unplug the power
supply plug during operation.
There is risk of fire or electric shock.
Do not handle or touch the product
with wet hands.
Do not place a heater or other
appliance near the power cable.
There is risk of fire and electric shock.
Do not allow water to run into
electrical parts.
It may cause fire, failure of the
product, or electric shock.
Do not store or use flammable gas
or combustibles near this product.
There is risk of fire or failure of
product.
Do not use the product in a tightly
closed space for a long time.
Oxygen deficiency could occur.
When flammable gas leaks, turn off
the gas and open a window for
ventilation before turning the
product on.
If strange sounds or smoke come
from product, turn the breaker off
or disconnect the power supply
cable.
There is risk of electric shock or fire.

Service Manual - VMH 9/12/18/24 SU & VMH30/36S D Series
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Stop operation and close the window
in storm or hurricane. If possible,
remove the product from the window
before the hurricane arrives.
There is risk of property damage, failure
of product, or electric shock.
Do not open the inlet grill of the
product during operation.
There is risk of physical injury, electric
shock, or product failure.
When the product is soaked, contact
an authorized service center. There is
risk of fire or electric shock.
Use caution that water does not
enter the product.
There is risk of fire, electric shock, or
product damage.
Ventilate the area from time to time
when operating this unit together
with a stove etc.
There is risk of fire or electric shock.
Turn the main power off when
cleaning or maintaining the product.
There is risk of electric shock.
When the product is not be used for
a long time, turn off the breaker.
There is risk of product damage or
failure, or unintended operation.
Take care to ensure that nobody can
step on or fall onto the outdoor unit.
This could result in personal injury and
product damage.
CAUTION
Always check for gas (refrigerant)
leakage after installation or repair of
product.
Low refrigerant levels may cause
failure of product.
Install the drain hose to ensure that
water is drained away properly.
A bad connection may cause water
leakage.
Keep level even when installing this
product.
It can avoid vibration or water leakage.
Do not install the product where
the noise or hot air from the
outdoor unit could affect
neighbors.
Use two or more people to lift and
transport the product.
Do not install the product where it
will be exposed to sea wind (salt
spray) directly.
It may cause corrosion on the
product. Corrosion, particularly on the
condenser and evaporator fins, could
cause product malfunction or
inefficient operation.
OPERATIONAL
Do not expose the skin directly to
cool air for long periods. (Do not
sit in the draft).
Do not use the product for
purposes such as preserving
foods, works of art, etc. It is a
consumer comfort air conditioner,
not a precision refrigeration
system.
There is risk of damage or loss of
property.
Do not block the inlet or outlet of
air flow.
Use a soft cloth to clean. Do not
use harsh detergents, solvents,
etc.
There is risk of fire, electric shock, or
damage to the plastic parts of the
product.
Do not touch the metal parts of the
product when removing the air
filter. They are very sharp.
Do not step on or put anything on
the product. (outdoor units)
Always insert the filter securely.
Clean the filter every two weeks or
more often if necessary.
A dirty filter reduces the efficiency of
the air conditioner and could cause
product malfunction or damage.
Do not insert hands or other
objects through air inlet or outlet
while the product is operating.

Service Manual - VMH 9/12/18/24 SU & VMH30/36S D Series
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Do not drink the water drained from
the product.
Use a firm stool or ladder when
cleaning or maintaining the product.
Be careful and avoid personal injury.
Replace the all batteries in the
remote control with new ones of the
same type. Do not mix old and new
batteries or different types of
batteries.
There is risk of fire or explosion.
Do not recharge or disassemble the
batteries. Do not dispose of batteries
in a fire.
They may explode.
If the liquid from the batteries gets
onto your skin or clothes, wash it
well with clean water. Do not use the
remote if the batteries have leaked.
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2. Part Names And Functions
2.1 Model Names of Indoor/Outdoor units
Series Capacity Indoor units Outdoor units
Inverter
9k B-VMH09SU-1 A-VMH09SU-1
B-VMH12SU-1 A-VMH12SU-1
12k
B-VMH18SU-1 A-VMH18SU-1
B-VMH24SU-1 A-VMH24SU-1
B-VMH30SD-1 A-VMH30SD-1
B-VMH36SD-1 A-VMH36SD-1
18k
24k
30k
36k

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2.2 Part names of Indoor/Outdoor units

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3. Dimension
3.1 Indoor Unit
W D
Model W D H
B-VMH09SU-1
(835mm)
32.9in
(198mm)
7.8in
(280mm)
11.0in
B-VMH12SU-1
B-VMH18SU-1 (990mm)
39.0in
(218mm)
8.6in
(315mm)
12.4in
B-VMH24SU-1
(1186mm )
46.7in
(258mm)
10.2in
(343mm)
13.5in
B-VMH30SD-1
B-VHH36SD-1

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For B-VMH09SU-1, B-VMH12SU-1
For B-VMH18SU-1
For B-VMH24SU-1
For B-VMH30SD-1, B-VMH36SD-1

Service Manual - VMH 9/12/18/24 SU & VMH30/36S D Series
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3.2 Outdoor Unit
Note: The above drawing is only for reference. The appearance of your units may be different.
Model W in(mm) D in(mm) H in(mm) W1 in(mm) A in(mm) B in(mm)
A-VMH09SU-1
31.5(800) 13.11(333) 21.81(554) 34.25(870) 20.24(514) 13.39(340)
A-VMH12SU-1
A-VMH18SU-1 33.27(845) 14.29(363) 27.64(702) 35.98(914) 21.26(540) 13.78(350)
A-VMH24SU-1
37.24(946) 16.14(410) 31.89(810) 40.55(1030) 26.50(673) 15.87(403)
A-VMH30SD-1
A-VMH36SD-1
More than 60cm(23.6in)
More than 70cm(27.6in)
More than 30cm(11.8in)
More than 60cm(23.6in)
(Service space)
Fence or
obstacles
More than 30cm(11.8in)

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4. Refrigerant Cycle Diagram
LIQUID SIDE
GAS SIDE
HEAT
EXCHANGE
(EVAPORATOR) HEAT
EXCHANGE
(CONDENSER)
Compressor
2-WAY VALVE
3-WAY VALVE
4-WAY VALVE
COOLING
HEATING
T2 Evaporator
temp. sensor
T1 Room temp.
sensor
T3 Condenser
temp. sensor
T5 Discharge
temp. sensor
T4 Ambient
temp. sensor
INDOOR OUTDOOR
Electronic
expansion valve
CAPILIARY TUBE
Accumulator
CAPILIARY TUBE