VMH24SC-1
Heat Controller, Inc. • 1900 Wellworth Ave. • Jackson, MI 49203 • (517)787-2100 • www.heatcontroller.com
SERVICE MANUAL
Inverter Single Zone
Ductless Mini Split Heat Pump
VMH Series Version C
VMH09SC-1
VMH12SC-1
VMH18SC-1
VMH24SC-1
2
Service Manual VMH SerieS Heat Controller, Inc.
CONTENTS
1.Safety Precautions ............................................................................................................................. 3
2. Functions ........................................................................................................................................... 8
3. Dimensions ...................................................................................................................................... 10
3.1 Indoor Unit .............................................................................................................................. 10
3.2 Outdoor Unit ........................................................................................................................... 11
4. Refrigerant Cycle Diagram ............................................................................................................. 12
5. Wiring Diagrams .............................................................................................................................. 13
5.1 Indoor Unit .............................................................................................................................. 13
5.2 Outdoor Unit ........................................................................................................................... 14
6. Installation Details ........................................................................................................................... 15
6.1 Power Wiring .......................................................................................................................... 15
6.2 Pipe length and elevation ....................................................................................................... 16
6.3 Pressure test and evacuation ................................................................................................. 17
7. Operation characteristics ............................................................................................................... 18
8. Electronic functions ........................................................................................................................ 19
8.1 Abbreviation ............................................................................................................................ 19
8.2 Display function ...................................................................................................................... 19
8.3 Main Protection ...................................................................................................................... 20
8.4 Operation Modes and Functions ............................................................................................ 21
9. Troubleshooting ..............................................................................................................................35
9.1 Indoor Unit Error Display ........................................................................................................ 36
9.2 Diagnosis and Solution ........................................................................................................... 36
3
Heat Controller, Inc. VMH SerieS Service Manual
1. Precaution
1.1 Safety Precaution
To prevent injury to the user or other people and property damage, the following
instructions must be followed.
Incorrect operation due to ignoring instruction will cause harm or damage.
Before service unit, be sure to read this service manual at first.
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.
Do not disassemble or repair the product, there is risk of fire or electric shock.
Always ground the product.
There is risk of fire or electric shock.
Install the panel and the cover of control box securely.
There is risk of fire of electric shock.
Always install a dedicated circuit and breaker.
Improper wiring or installation may cause fIre or electric shock.
Use the correctly rated breaker of 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.
4
Service Manual VMH SerieS Heat Controller, Inc.
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.
There is risk of fire, electric shock, explosion, or injury.
Do not install the product on a defective installation stand.
It may cause injury, accident, or damage to the product.
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.
Moisture may condense and wet or damage furniture.
Take care to ensure that power cable can not 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 touch (operation) the product with wet hands.
There is risk of fire or electric shock.
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 electric parts.
It may cause fire, failure of the product, or electric shock.
Do not store or use flammable gas or combustible near the 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
turn the product on.
5
Heat Controller, Inc. VMH SerieS Service Manual
Do not use the telephone or turn switches on or off.
There is risk of explosion or fire.
If strange sounds, or small or smoke comes from product. Turn the breaker off or
disconnect the power supply cable.
There is risk of electric shock or fire.
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. (Do not touch the electrostatic
filter, if the unit is so equipped.)
There is risk of physical injury, electric shock, or product failure.
When the product is soaked (flooded or submerged), contact an your dealer.
There is risk of fire or electric shock.
Use caution that water could not enter the product.
There is risk of fire, electric shock, or product damage.
Ventilate the product from time to time when operating it 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, disconnect the power supply plug or
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.
6
Service Manual VMH SerieS Heat Controller, Inc.
Keep level even when installing the product.
To avoid vibration of water leakage.
Use two or more people to lift and transport the product.
Avoid personal injury.
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 of time. (Do not sit in the
draft).
This could harm to your health.
Do not use the product for special purposes, such as preserving foods, works of art, etc.
It is a consumer air conditioner, not a precision refrigerant system.
There is risk of damage or loss of property.
Do not block the inlet or outlet of air flow.
It may cause product failure.
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.
There is risk of personal injury.
Do not step on or put anything on the product. (outdoor units)
There is risk of personal injury and failure of product.
Always insert the filter securely. Clean the filter every two weeks or more often if
necessary.
7
Heat Controller, Inc. VMH SerieS Service Manual
A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or
damage.
Do not insert hands or other object through air inlet or outlet while the product is
operated.
There are sharp and moving parts that could cause personal injury.
Do not drink the water drained from the product.
It is not sanitary could cause serious health issues.
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 mew 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 burn of explode.
If the liquid from the batteries gets onto your skin or clothes, wash it well with clean
water. Do not use the remote of the batteries have leaked.
The chemical in batteries could cause burns or other health hazards
8
Service Manual VMH SerieS Heat Controller, Inc.
2. Function
When the power supply is
interrupted and then restored, the
unit automatically restarts at the
previous function setting.
Maintains the room temperature according
to the set temperature
The mode can be change by the room temperature
The louver can be set at the desired position or
swing up and down automatically
The function is usually used in rainy
days in springtime or damp areas
The fan is turned to low speed in both
cooling and heating
The unit will decide the louver direction according
to operation mode
Turbo, high, med, low, breeze
Restart is for approx. 3 minutes
Prevents condensate from freezing on evaporator
by sensing the evaporator pipe temperature
in cooling mode
Room temperature sensor
Pipe temperature sensor
Indoor unit
Operation by remote controller
Sensing room temperature
Room temperature control
Anti-freeze protection in cooling
Time Delay Safety control
Indoor fan speed control
Two-direction air vane
Sleep mode auto control
Independent dehumidification
Air flow Direction control
Auto mode
Temp. Compensation
Auto defrost
Anti-cold function
Self-diag. function
Auto-restart function
Timer function
Ionizer
Prevent the cold wind at the
beginning of unit start.
Self clean
Indoor golden fin
Follow me
Ionizer
Indoor golden n
9
Heat Controller, Inc. VMH SerieS Service Manual
Protects the valves and prevents water from dripping.
3 minute time delay between ON/OFF operation.
Outdoor unit
Compressor delay
Hydrophilic aluminum fin
Energized in the heating mode except
when in defrost.
Anti-rust cabinet
Valve protection cover
4 way valve control
Made from electrolytic zinc steel and
anti-rust coated components.
Low noise air flow system
Bird tail propeller fan makes the outdoor unit run more
quietly.
Discharge pipe temperature protection
Operates down to 5°F(15°C)
Crankcase heater chassis heater for some full DC
10
Service Manual VMH SerieS Heat Controller, Inc.
3. Dimension
3.1 Indoor Unit
Model
Dimension (mm)
W H D
B-VMH09SC
B-VMH12SC
845
(33.3in)
286
(11.3in)
165
(6.5in)
B-VMH18SC
B-VMH24SC
1080
(42.5in)
320
(12.6in)
200
(7.9in)
11
Heat Controller, Inc. VMH SerieS Service Manual
3.2 Outdoor Unit
Model
Dimension (mm)
W D H W1 A B
A-VMH09SC
760
(29.9in)
285
(11.2in)
590
(23.2in)
823
(32.4in)
530
(20.9in)
290
(11.4in)
A-VMH12SC
A-VMH18SC
845
(33.3in)
335
(13.2in)
695
(27.4in)
918
(36.1in)
560
(22.0in)
335
(13.2in)
A-VMH24SC
895
(35.2in)
330
(13.0in)
860
(33.9in)
975
(38.4in)
590
(23.2in)
333
(13.1in)
12
Service Manual VMH SerieS Heat Controller, Inc.
4. Refrigerant Cycle Diagram:
INDOOR OUTDOOR
LIQUID SIDE
GAS SIDE
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
COMPRESSOR
2-WAY VALVE
3-WAY VALVE
CHECK VALVE
(Heating Model only)
CAPILIARY TUBE
REVERSING VALVE
(Heating Model only)
COOLING
HEATING
ACCUMULATOR
13
Heat Controller, Inc. VMH SerieS Service Manual
5. Wiring Diagrams:
5.1 Indoor Units
B-VMH09SC-1 B-VMH12SC-1
B-VMH18SC-1 B-VMH24SC-1
14
Service Manual VMH SerieS Heat Controller, Inc.
5.2 Outdoor Unit
A-VMH09SC-1 A-VMH12SC-1
A-VMH18SC-1
Loading...