Heat Controller VMH C Series User manual

Heat Controller • 1900 Wellworth Ave. • Jackson, MI 49203 • [phone] • www.heatcontroller.com
SERVICE MANUAL
Inverter Single Zone
Ductless Mini Split Heat Pump
VMH Series Version C
VMH30SC-1
VMH36SC-1

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Service Manual VMH 30, 36 SerieS Heat Controller
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 Wrench torque sheet for installation....................................................................................... 15
6.2 Power Wiring .......................................................................................................................... 15
6.3 Pipe length and elevation....................................................................................................... 16
6.4 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 .............................................................................................................................. 33
9.1 Indoor Unit Error Display ........................................................................................................ 33
9.2 Diagnosis and Solution........................................................................................................... 34

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Heat Controller VMH 30, 36 SerieS Service Manual
1. Precaution
1.1 Safety Precaution
nTo prevent injury to the user or other people and property damage, the following
instructions must be followed.
nIncorrect operation due to ignoring instructions will cause harm or damage.
nBefore servicing unit, be sure to read this service manual.
1.2 WARNING
uInstallation
nDo not use a defective or underrated circuit breaker. Use this appliance on a dedicated
circuit.
There is a risk of re or electric shock.
nFor electrical work, contact the dealer, seller, a qualied electrician, or an authorized
service center.
Do not disassemble or repair the product, there is a risk of re or electric shock.
nAlways ground the product.
There is a risk of re or electric shock.
nInstall the panel and the cover of control box securely.
There is a risk of re or electric shock.
nAlways install a dedicated circuit and breaker.
Improper wiring or installation may cause re or electric shock.
nUse a correctly rated breaker of fuse.
There is risk of re or electric shock.
nDo not install, remove, or reinstall the unit by yourself (customer).
There is risk of re, electric shock, explosion, or injury.
nUse caution when unpacking and installing the product.
Sharp edges could cause injury, be especially careful of the case edges and the ns on the
condenser and evaporator.

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Service Manual VMH 30, 36 SerieS Heat Controller
nFor installation, always contact the dealer or an Authorized service center.
There is a risk of re or electric shock.
nDo not install this product on a defective installation stand.
It may cause injury, accident, or damage to the product.
nBe 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.
nDo 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
nTake care to ensure that the power cable can not be pulled out or damaged during
operation.
There is a risk of re or electric shock.
nDo not place anything on the power cable.
There is a risk of re or electric shock.
nDo not touch this product with wet hands during operation.
There is a risk of re or electric shock.
nDo not place a heater or other appliance near the power cable.
There is a risk of re or electric shock.
nDo not store or use ammable gas or combustibles near this product.
There is risk of re or failure of product.
nDo not use this product in a tightly closed space for a long time.
Oxygen deciency could occur.
nIn the event of ammable gas leaks, turn off the gas, open a window for ventilation, and
repair leaks before turning the product on.
Do not use the telephone or turn power switches on or off.
There is risk of explosion or re.

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Heat Controller VMH 30, 36 SerieS Service Manual
nIf strange sounds, smells, or smoke come from product, turn the breaker off or disconnect
the power supply.
There is a risk of electric shock or re.
nDo not open the inlet grill of this product during operation. (Do not tough the electrostatic
lter, if the unit is so equipped.)
There is risk of physical injury, electric shock, or product failure.
nUse caution that water does not enter the product.
There is risk of re, electric shock, or product damage.
nTurn the main power off when cleaning or maintaining this product.
There is risk of electric shock.
nWhen this product is not used for a long time, disconnect the power supply or turn off the
breaker.
There is risk of product damage or failure, or unintended operation.
uCAUTION
nAlways check for gas (refrigerant) leakage after installation or repair of product.
Low refrigerant levels may cause failure of product.
nInstall the drain hose to ensure that water is drained away properly.
nKeep level even when installing the product.
It can avoid vibration or water leakage.
nDo not install this product where noise or hot air from the outdoor unit could damage the
neighboring property.
It may cause a problem for your neighbors.

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Service Manual VMH 30, 36 SerieS Heat Controller
nUse two or more people to life and transport this product.
Avoid personal injury.
nDo not install this product where it will be exposed to sea wind (salt spray) directly.
It may cause corrosion. Corrosion, particularly on the condenser and evaporator ns, could cause
product malfunction or inefcient operation.
uOPERATIONAL
nDo not expose skin directly to cool air for long periods of time. (Do not sit in the draft).
This could cause harm to your health.
nDo not use this 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.
nDo not block the inlet or outlet of air ow.
It may cause product failure.
nUse a soft cloth to clean. Do not use harsh detergents, solvents, etc.
There is a risk of re, electric shock, or damage to the plastic parts of the product.
nDo not touch the coil ns when removing the air lter. They are very sharp.
There is risk of personal injury.
nDo not step on or put anything on this product. (outdoor units)
There is risk of personal injury and failure of product.
nAlways insert the lter securely. Clean the lter every two weeks or more often if
necessary.
A dirty lter reduces the efciency of the air conditioner and could cause product malfunction or
damage.
nDo not insert hands or other objects through air inlet or outlet while this product is
operating.
There are sharp and moving parts that could cause personal injury.
nDo no drink the water drained from this product.
It is not sanitary could cause serious health issues.

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Heat Controller VMH 30, 36 SerieS Service Manual
nUse a rm stool or ladder when cleaning or maintaining this product.
Be careful to avoid personal injury.
nReplace all batteries in the remote control with new ones at the same type. Do not mix old
and new batteries or different types of batteries.
There is risk of re or explosion.
nDo not recharge or disassemble the batteries. Do not dispose of batteries in a re.
They may burn of explode.
nIf 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.
The chemical in batteries could cause burns or other health hazards.

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Service Manual VMH 30, 36 SerieS Heat Controller
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2. Function
When the power supply is
interrupted and then restored,
the air conditioners
automatically restores the
previous function setting.
Maintain the room temperature in accordance
with the setting temperature.
The mode can be changed automatically by the
room temperature.
The louver can be set at the desired position or
swing up and down automatically
The function is usually used on rainy days
in springtime or damp areas to remove to
moisture from the air.
The fan is turned to low speed
(cooling/heating).
The unit will turn off after seven hours.
The unit will decide the louver direction
according to operation mode.
Turbo wind, high, med, low, auto.
Restarting after for approx. 3 minutes to
protect the compressor.
Prevents the water from freezing on evaporator by
sensing the evaporator pipe temperature in cooling
mode.
Indoor unit
Operation by remote controller
Sensing by room temperature
Room temperature control
Anti-freezing control in cooling
Time Delay Safety control
Indoor fan speed control
Two-direction air vane
Sleep mode auto control
Air flow Direction control
Auto mode
Temp. Compensation Flexible wiring connection
Auto defrost
Anti-cold function
Self-diag. function
Auto-restart function
Prevents indoor unit from blowing
cold air when the unit starts up..
Independent dehumidification
Timer function
Ionizer (optional)
Follow me (optional)
Restarts after for approx. 3 minutes to
protect the compressor.
Maintains the room temperature in accordance
with the temperature setting.
Senses room temperature

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Heat Controller VMH 30, 36 SerieS Service Manual
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It protects the valves and prevents water from dripping.
The unit has 3 minute delay between ON/OFF operations.
Outdoor unit
Power relay control
Valve protection cover
Low noise air flow system
Propeller fan makes the outdoor unit run more quietly.
Compressor crankcase heater
Anti-rust cabinet
Discharge pipe temperature protection

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Service Manual VMH 30, 36 SerieS Heat Controller
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3. Dimension
3.1 Indoor Unit
Model W in.(mm) D in.(mm) H in.(mm)
B-VMH30SC-1 56.9(1445) 8.9(277) 13.4(340)
B-VMH36SC-1

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Heat Controller VMH 30, 36 SerieS Service Manual
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3.2 Outdoor Unit
Dimension Mode W in.(mm) D in.(mm) H in.(mm) W1 in.(mm) A in.(mm) B in.(mm)
A-VMH30SC-1 35.4(900) 12.4(315) 33.9(860) 38.9(980) 23.2(590) 13.1(333)
A-VMH36SC-1 39.0(990) 13.6(345) 38.0(965) 42.3(1075) 24.5(624) 14.4(366)

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Service Manual VMH 30, 36 SerieS Heat Controller
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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

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Heat Controller VMH 30, 36 SerieS Service Manual

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Service Manual VMH 30, 36 SerieS Heat Controller
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5.2 Outdoor Unit
A-VMH30SC-1
A-VMH36SC-1

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Heat Controller VMH 30, 36 SerieS Service Manual
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6 Installation details
6.1 Wrench torque sheet for installation
Outside diameter
Torque
Additional tightening
mm inch N.cm N.cm
Ф6.35
1/4
1500
1600
Ф9.52
3/8
2500
2600
Ф12.7 1/2 3500 3700
Ф16
5/8
4500
4700
Ф19
3/4
6500
6700
6.2 Power wiring & connecting cables
Power Wiring
Consult local building codes, NEC (National Electric Code) or CEC (Canadian Electric Code)
for special requirements.
Connecting Cables: Voltage drop on the connecting cable should be kept to a minimum. The
operating voltage will vary between -24V to 24V DC.

Use cable:
Model Size Power Source Min. Ckt Amp
Max. Fuse/CB Amp
AWG (min.)
Connecting Cable
(outdoor to indoor)
30K 208/230V-60-1 16.0/25.0 14/4 Copper
Stranded
36K 20.0/30.0

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6.3 Pipe length and the elevation
Capacity
Btu/h
Pipe size Standard
length
ft. (m)
Max.
Elevation
B ft. (m)
Max.
Length
A ft. (m) oz
Additional
refrigerant
/ft. (g/m)
Gas Liquid
30K 5/8’’
(Ф16)
3/8’’
(Ф9.52)
16.5(5) 33(10)
50(15)
0.4(40)
36K 50(15)
Caution:
Unit charge on rating plate includes enough refrigerant for 16.5 ft. (5m) of line set. The capacity is
based on standard length and the maximum permissive length is based on the system reliability.
Oil trap should be installed per 16.5-23 ft. (5-7 meters.) when outdoor unit is installed 16.5 ft. (5m)
higher than the indoor unit. It is not necessary to install oil traps when outdoor unit is located lower
than indoor unit. Charge adjustment is not required for line set lengths less than 16.5 ft. (5m).

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Heat Controller VMH 30, 36 SerieS Service Manual
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6.4 Pressure Test & Evacuation
Air and moisture in the refrigerant system will have undesirable effects.
●Pressure in the system rises.
●Operating current rises.
●Cooling or heating efficiency drops.
●Moisture in the refrigerant circuit may freeze and block capillary tubing.
●Refrigerant lines and indoor coil should be evacuated using the recommended deep vacuum
method of 500 microns. The alternate triple evacuation method may be used if the procedure
outlined is followed.
1. System Evacuation and Charging
1. Completely tighten the flare nuts of the indoor and outdoor units, connect manifold gauge low side
hose to low side service valve.
2. Connect the manifold gauge charge hose to the vacuum pump.
3. Fully open the low side of manifold gauge.
4. Start vacuum pump.
5. Evacuate using either deep vacuum or triple evacuation method.
6. After evacuation is complete, fully close the low side of manifold gauge and shut off vacuum pump.
7. The factory charge contained in the outdoor unit is good for up to 16.5 ft. of line length. For line set
lengths over 16.5 ft., adjust charge according to chart in section 6.3.
8. Disconnect charge hose from low side service valve.
9. Fully open both high and low side service valves and securely tighten caps.
(Indoor unit)
(Liquid side)
(Gas side)
Vacuum
pump
Vacuum
pump
Lo Hi
HI Side
Two-way valve
Close
Manifold valve
500 Microns
Low Side
Charge hose Charge hose
(Outdoor unit)
Close
Three-way valve

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2. Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of pulling a vacuum of 500 microns and a
vacuum of 500 microns and vacuum gage capable of accurately measuring the vacuum depth. The
deep vacuum method is the most positive way of assuring a system is free of air and liquid water.
1. Vacuum pressure should pull down below 500 microns in 2 minutes.
2. Evacuate system for 30 minutes.
3. Shut valve to vacuum pump off.
4. After 10 minutes read pressure.
If pressure remains below 1000 microns, system is ready.
If pressure is between 1000 and 2000 microns continue evacuation for additional 30 minutes.
If pressure is above 2000 microns, there is a leak in the system.
3. Triple Evacuation Method
The triple evacuation method should only be used when vacuum pump is only capable of pumping
down to a 28” Hg. vacuum and system does not contain any liquid water.
1. Pump system down to 28”Hg. and allow pump to continue operating for an additional
15 minutes.
2. Close high and low side valves on gauge manifold and shut off vacuum pump.
3. Connect a nitrogen cylinder and regulator to system and open until system pressure is 2 psig.
4. Close service valve and allow system to stand for 1 hour. This will allow dry nitrogen to
diffuse throughout the system absorbing moisture.
5. Complete this procedure until system until it is able to hold a deep vacuum then release
charge into system.
4. Final Tubing Check
IMPORTANT: Check to be certain factory tubing on both indoor and outdoor unit has not shifted
during shipment. Ensure tubes are not rubbing against each other or any sheet metal. Pay close
attention to feeder tubes, making sure wire ties on feeder tubes are secure and tight.
7. Operation characteristics
CAUTION:
1. Operation of air conditioner beyond the above conditions may cause certain protections to occur.
2. Room relative humidity should be less than 80%. If the air conditioner operates in excess of this
value, the surface of the air conditioner may cause condensation. If condensation does occur,
place the vertical air louver to it’s maximum angle (vertically to the floor) and set the fan to high
speed.
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2. Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of pulling a vacuum of 500 microns and a
vacuum of 500 microns and vacuum gage capable of accurately measuring the vacuum depth. The
deep vacuum method is the most positive way of assuring a system is free of air and liquid water.
1. Vacuum pressure should pull down below 500 microns in 2 minutes.
2. Evacuate system for 30 minutes.
3. Shut valve to vacuum pump off.
4. After 10 minutes read pressure.
If pressure remains below 1000 microns, system is ready.
If pressure is between 1000 and 2000 microns continue evacuation for additional 30 minutes.
If pressure is above 2000 microns, there is a leak in the system.
3. Triple Evacuation Method
The triple evacuation method should only be used when vacuum pump is only capable of pumping
down to a 28” Hg. vacuum and system does not contain any liquid water.
1. Pump system down to 28”Hg. and allow pump to continue operating for an additional
15 minutes.
2. Close high and low side valves on gauge manifold and shut off vacuum pump.
3. Connect a nitrogen cylinder and regulator to system and open until system pressure is 2 psig.
4. Close service valve and allow system to stand for 1 hour. This will allow dry nitrogen to
diffuse throughout the system absorbing moisture.
5. Complete this procedure until system until it is able to hold a deep vacuum then release
charge into system.
4. Final Tubing Check
IMPORTANT: Check to be certain factory tubing on both indoor and outdoor unit has not shifted
during shipment. Ensure tubes are not rubbing against each other or any sheet metal. Pay close
attention to feeder tubes, making sure wire ties on feeder tubes are secure and tight.
7. Operation characteristics
CAUTION:
1. Operation of air conditioner beyond the above conditions may cause certain protections to occur.
2. Room relative humidity should be less than 80%. If the air conditioner operates in excess of this
value, the surface of the air conditioner may cause condensation. If condensation does occur,
place the vertical air louver to it’s maximum angle (vertically to the floor) and set the fan to high
speed.
-15°C~50°C/5°F~122°F

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8. Electronic functions
8.1 Abbreviation
T1: Indoor room temperature
T2: Coil temperature of evaporator
T3: Coil temperature of condenser
T4: Outdoor ambient temperature
T5: Compressor discharge temperature
TS: Preset temperature
8.2 Display function
8.2.1 Icon explanation on indoor display board.
①Auto indicator
This indicator illuminates when the air conditioner is in AUTO operation.
②Timer indicator
This indicator illuminates when TIMER is set ON/OFF.
③PRE.-DEF. Indicator
This indicator illuminates when the air conditioner starts defrosting automatically or when the warm air
control feature is activated in heating mode.
④TEMPERATURE indicator
Usually this displays the temperature settings. When changing the setting temperature, this indicator
begins to flash, and stops 20 seconds later. It displays the room temperature when the air conditioner
is in FAN only operation, and the range of that is 32~122°F (or 50°C). When the unit stops operation, it
returns to original factory settings. It will also display the codes when a fault occurs.
⑤Frequency indicator

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This indicator appears only when the compressor is in operation and indicates the current operating
frequency.
8.2.2 LED display control function.
Pressing “LED display” button on remote controller will turn off all displays on indoor unit.
Pressing once again, all displays resume.
8.3 Main Protection
8.3.1 Three Minute Delay at restart for compressor.
---- 1 minute delay for the 1st time start-up and 3 minute delay for others.
8.3.2 Temperature protection of compressor top.
---- Top temp. protector will cut off for 30 seconds and restart the compressor after 3 minute delay.
8.3.3 Temperature protection of compressor discharge.
----When the compressor discharge temp. raises, the running frequency will be limited as
follow:
----When compressor discharge temp. T5>239°F(115°C) for 5 seconds, compressor stops.
---- 226°F (108°C)<T5<239°F(115°C), decrease the frequency every 3 minutes.
----- 194°F (90°C)<T5<221°F(105°C), keep running at the current frequency.
-----T5 <194°F(90°C) no limit for frequency.
8.3.4 Fan Speed is out of control.
----When Indoor Fan Speed is too low or too high for a certain time, the unit will stop and the LED will
display this code on indoor.
8.3.5 Inverter module Protection.
----The Inverter module itself has a protection function against current, voltage and temperature. If
these protections happen, the corresponding code will display on indoor unit.
8.3.6 Indoor fan delayed open function
----When the system starts up, the louver will be active immediately and the indoor fan louver will open
10 seconds later.
8.3.7 Compressor preheating functions.
----Preheating permitting condition: