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HEAT CONTROLLER, INC.
Wall Mounted
Mini-Split System
Single-Zone
Air Conditioning/Heat Pump
Service Manual(General)
VMC09SB-1/VMH09SB-1
VMC12SB-1/VMH12SB-1
VMC18SB-1/VMH18SB-1
VMC24SB-1/VMH24SB-1
VMC30SB-1/VMH30SB-1
Before servicing the unit, read the
“safety precautions” in this manual.
Only for authorized service personnel.
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Air Conditioner Service Manual CONTENTS Part 1 General Information 1. Safety Precautions........................................................................................................4 Part 2 Functions & Controls 1. List of Functions & Controls........................................................................................8 2. Basic Mode Controls ...................................................................................................9 3. Special Mode Controls ....
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Part 1 General Information 1. Safety Precautions ............................................................................................................4 - 3 - Only for training and service purposes
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Part 1 General Information 1. Safety Precautions To prevent injury to the user other people and property damage, the following instructions must be followed. Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the follow- ing indications. This symbol indicates the possibility of death or serious injury. This symbol indicates the possibility of injury or damage to property only. Meanings of symbols used in this manual are as shown be
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Part 1 General Information Do not use a defective or underrated circuit breaker. Use the correctly rated breaker and fuse. Otherwise there is a risk of fire or electric shock. Install the panel and the cover of control box securely. Otherwise there is risk of fire or electric shock due to dust, water etc. Indoor/outdoor wiring connections must be secured tightly and the cable should be routed properly so that there is no force pulling the cable from the connection terminals. Improper or loose
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Part 1 General Information 1.2 Inspections after Repair Check to see if the power cable plug is not dirty or loose. If the plug is dusty or loose it can cause an electrical shock or fire. Do not use a joined power cable or extension cable, or share the same power outlet with other electrical appliances. Otherwise, it can cause an electrical shock, excessive heat generation or fire. Do not insert hands or other objects through the air inlet or outlet while the prod- uct is operating. There ar
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Part 2 Functions & Controls 1. List of Controls & Functions ..........................................................................................8 2. Basic Mode Controls........................................................................................................9 3. Special Mode Controls...................................................................................................11 4. Utility Functions .......................................................................
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Part 2 Functions & Controls 1. List of Functions & Controls Category Function Description Remark Cooling Mode Cooling operation Heating Mode Heating operation Basic mode Healthy Dehumidification Dry operation controls Auto Changeover Cooling mode is automatically changed to heating mode and vice versa Jet Cool Powerful cooling mode Special Mode Jet Heat Powerful heating mode controls Energy saving Air volume & set temp. are automatically selected for saving Cooling Mode Only energy in cool
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Part 2 Functions & Controls 2. Basic Mode Controls 2.1 Cooling Mode Thermo ON +0.5°C(1°F) Setting Temp. -0.5°C(-1°F) Thermo OFF INV. Comp. High Low Comp. OFF High Low Frequency Operating frequency of compressor depends on the load condition, like the difference between the room temp. and the set temp., frequency restrictions. If the compressor operates at some frequency, the operating frequency of compressor cannot be changed within 30 seconds. ( not emergency conditions) Compressor t
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Part 2 Functions & Controls 2.3 Healthy Dehumidification operation • When the dehumidification operation is set by the remote controller, the intake air temperature is detected and the set- ting temp. is automatically set according to the intake air temperature. Intake air Temp. Setting Temp. 26°C(78.8°F) ≤ intake air temp. 25°C(77°F) 24°C(75.2°F) ≤ intake air temp.< 26°C(78.8°F) intake air temp. -1°C(-2°F) 22°C(71.6°F) ≤ intake air temp. < 24°C(75.2°F) intake air temp. -0.5°C(-1°F) 18°C(64.4°
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Part 2 Functions & Controls 3. Special Mode Controls 3.1 Jet Cool operation • In the heating mode or Fuzzy operation, the Jet cool function does not work. When it is input while in other mode of operation (cooling, dehumidification, ventilation), the Jet cool operation takes place. • In the Jet cool mode, the indoor fan is operated at super-high speed for 30 min. at cooling mode operation. • In the Jet cool mode, the room temperature is maintained at a setting temperature of 18°C(64.4°F). • W
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Part 2 Functions & Controls 4. Utility Functions 4.1 Forced operation • To operate the appliance manually if the remote control is lost. The forced operation selection switch is on the main unit of the appliance and will operate the appliance in the standard conditions. • The operating condition is set according to the outdoor temp. and intake air temperature as follows. Heat pump Model Cooling Model Room Temp. ≥ 24°C(75.2°F) 21°C(69.8°F) ≤ Room Temp. < 24°C(75.2°F) Room Temp. < 21°C(69.8°F)
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Part 2 Functions & Controls 4.3 Air volume control Step Description • Indoor fan motor control have 6 steps. LL Very low, In heating mode • Air volume is controlled "SH", "H", "Med", "Low" by the remote con- troller. L Low • "LL" step is selected automatically in Hot start operation. M Med H High SH Super high 4.4 Natural Air Control(Auto Wind) Auto Natural wind • When the Auto Step is selected, the high, medium, or low speed of the airflow mode is operated for 2~15 sec. randomly by the C
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Part 2 Functions & Controls 4.6.2 Sleep timer operation for heating cycle Heatpump Only • While in heating mode, 60 min. after the start of the sleep timer, the setting temperature decreases by 1 C(2 . After another 60minutes lapse, it decreases again by 1°C(2 . Setting temp. (°C) Heating ON temp. (Setting temp) 1.0°C(2°F) down 1.0°C(2°F) down Heating OFF temp. (Setting temp. +4.0°C(+8°F)) ( ) 1 2 Sleep time hr 4.7 Auto restart • When the power comes back after a sudden power fa
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Part 2 Functions & Controls 5. Protection Functions & Controls 5.1 Five Seconds Stand-by (fan) • The indoor unit fan will begin to rotate after 5 seconds of the unit being turned on. 5.2 Two Minutes Stand-by (comp.) • After the compressor cycles off, it will not restart for a minimum of 2 minutes. 5.3 Hot start Heatpump Only • To prevent cold air from blowing in the room upon starting up the unit in heating mode, the indoor fan will not rotate until the heat exchanger temperature reaches
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Part 2 Functions & Controls 5.5 Compressor Preheating Heatpump Only 5.5.1 9,12kBtu/h Model With low outdoor temperature, preheating the compressor compressor is neccessary to maintain the oil viscosi- ty before the unit starts. The preheating Mode preheats the compressor motor coil/windings by electric current without compressor run- ning. Mode-in conditions : Outdoor temp. < 0˚C (32˚F) and Discharge pipe temp < 15˚C (59˚F) Mode-out conditions : Outdoor temp. > 5˚C (41˚F) or Discharge pipe
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Part 2 Functions & Controls 5.5 Automatic defrost Heatpump Only 5.5.1 9,12kBtu/h Model • While in heating mode operation, in order to protect the evaporator pipe of the outdoor unit from freezing, the unit is reversed to the cooling cycle to defrost the evaporator pipe of the outdoor unit. • Defrost control is available 40 minutes after the heating cycle started and the difference of the pipe tem-perature of outdoor unit reaches above option 1. • The defrost control is available without re
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Part 2 Functions & Controls 5.5.2 18,24,30kBtu/h Model • Starting the defrosting operation 1) Defrost operation will start when the conditions below are met: a) Accumulation time of operation and the period after completion of defrost = 35 min. b) After 10 minutes from re-starting the compressor and over 35 minutes of accumulated operating time, defrosting operation starts after 10 minutes. c) Piping temperature of the outdoor heat exchanger is maintained below the defrost starting temperat
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Part 2 Functions & Controls • Defrosting Control Algorithm 1) Lowering the compressor frequency starts the defrosting operation. Constant speed compressor is ON 10 seconds. 2) The EEV has an opening 350 pulse (Option) when starting the defrosting operation. 3) Reversing valve is OFF after 5 seconds from the compressor reaching an operating frequency of 30 Hz. Then the indoor fan turns OFF (including when the indoor unit is OFF, except if the remote controller is OFF). 4) After 5 seconds fr
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Part 2 Functions & Controls 5.6 Power Relay Control • Power relay turns on 1 second later after the power is supplied to the outdoor unit. • Control sequence : power on PTC operating power relay on 5.7 Inverter UV W + U 3Ø V Comp. Motor W 1. The single phase power AC is converted into DC. 2. The single phase power DC is converted into a three phase chopped DC voltage with a variable frequency. 3. When the frequency changes, the rotation speed of the compressor changes resulting in a
