SERVICE MANUAL
Inverter Flex Multi-Zone
Ductless Mini Split
Outdoor Section
A-VMH18DC-1
A-VMH27TC-1
A-VMH36QC-1
Heat Controller, Inc. • 1900 Wellworth Ave. • Jackson, MI 49203 • (517)787-2100 • www.heatcontroller.com
Service Manual VMH SerieS Heat Controller, Inc.
CONTENTS
1.General Information of Outdoor Units ........................................................... 3
2. Features........................................................................................................... 4
3. Dimensions ..................................................................................................... 5
4. Wiring Diagram ............................................................................................... 6
5. Refrigeration Cycle Diagram ......................................................................... 8
6. Indoor unit Combinations ............................................................................ 10
7. Installation Details ........................................................................................ 11
8. Electronic Control Function ........................................................................ 20
9. Troubleshooting ........................................................................................... 25
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Heat Controller, Inc. VMH SerieS Service Manual
1. General information of Outdoor Units
Model name Dimension mm(in) Compressor
A-VMH18DC-1 845x320x700(33.3x12.6x27.6) DA130S1C-20FZ
A-VMH27TC-1 845x320x700(33.3x12.6x27.6) DA150S1C-20FZ
A-VMH36QC-1 990x345x965(39x13.6x38) TNB306FPGMC-L
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Service Manual VMH SerieS Heat Controller, Inc.
2．Features
The hydrophilic fin is corrosion resistant and improves heating efficiency in heat mode by absorbing the water on
Operates only in heating mode except during defrosting.
It protects the valves and prevents water from dripping in the cabinet.
Outdoor unit
Power relay control
Low noise air flow system
Hydrophilic aluminum fin
its surface and by spreading the water instead of forming water droplets.
4 way valve control
Anti-rust cabinet
Valve protection cover
Discharge pipe temperature protection
Compressor crankcase heater
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Heat Controller, Inc. VMH SerieS Service Manual
3. Dimensions
Model W D H W1 A B
mm(in)
A-VMH18DC-1
A-VMH24TC-1
A-VMH36QC-1 990(39) 345(13.6) 965(38) 1075(42.3) 624(24.6) 366(14.4)
845((33.3) 320(12.6) 700(27.6) 908(35.7) 560(22) 335(13.2)
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Service Manual VMH SerieS Heat Controller, Inc.
4. Wiring Diagram
4.1 A-VMH18DC-1
4.2 A-VMH27TC-1
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Heat Controller, Inc. VMH SerieS Service Manual
4.3 A-VMH36QC-1
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Service Manual VMH SerieS Heat Controller, Inc.
5. Refrigeration Cycle Diagram
8.1 Refrigeration circuit drawing of inverter dual zone: A-VMH18DC-1
INDOOR OUTDOOR
CAPILIARY A
LIQUID VALVE A
LIQUID VALVE B
EXV A
EXV B
CHECK VALVE
CAPILIARY B
CAPILIARY TUBE
T3
Condenser
temp. sensor
HEAT
EXCHANGE
(EVAPORATOR)
T2 Evaporator
temp. sensor
T1 Room
temp. sensor
GAS VALVE A
GAS VALVE B
Accumulator
Compressor
T4 Ambient
temp. sensor
4-WAY VALVE
T5 Discharge
temp. sensor
5.2 Refrigeration circuit drawing of inverter tri-zone: A-VMH27TC-1
INDOOR OUTDOOR
CAPILIARY A
EXV A
EXV B
EXV C
CAPILIARY B
CAPILIARY C
CHECK VALVE
CAPILIARY TUBE
T4 Ambient
temp. sensor
HEAT
EXCHANGE
(EVAPORATOR)
T1 Room
temp. sensor
LIQUID VALVE A
LIQUID VALVE B
LIQUID VALVE C
HEAT
EXCHANGE
(CONDENSER)
COOLING
HEATING
T3
Condenser
temp. sensor
HEAT
EXCHANGE
(CONDENSER)
T2 Evaporator
temp. sensor
GAS VALVE A
GAS VALVE B
GAS VALVE C
Accumulator
Compressor
4-WAY VALVE
T5 Discharge
temp. sensor
COOLING
HEATING
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Heat Controller, Inc. VMH SerieS Service Manual
8.3 Refrigeration circuit drawing of inverter Quad-zone: A-VMH36QC-1
INDOOR OUTDOOR
CAPILIARY A
LIQUID VALVE A
LIQUID VALVE B
LIQUID VALVE C
LIQUID VALVE D
EXV A
EXV B
EXV C
EXV D
CAPILIARY B
CAPILIARY C
CAPILIARY D
CHECK VALVE
CAPILIARY TUBE
T3
Condenser
temp. sensor
HEAT
EXCHANGE
(EVAPORATOR)
T2 Evaporator
temp. sensor
T1 Room
temp. sensor
GAS VALVE A
GAS VALVE B
GAS VALVE C
GAS VALVE D
Accumulator
Low pressure
switch
Compressor
T4 Ambient
temp. sensor
4-WAY VALVE
High pressure
switch
T5 Discharge
temp. sensor
HEAT
EXCHANGE
(CONDENSER)
COOLING
HEATING
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Service Manual VMH SerieS Heat Controller, Inc.
Combinations
Unit A
Unit B
9k
—
12k
—
18k
—
9k
9k
9k
12k
Combinations
Unit A
Unit B
Unit C
9k — —
12k — —
18k — —
9k
9k
—
9k
12k
—
9k
18k
—
12k
12k — TRI (1x3)
9k
9k
9k
Combinations
Unit A
Unit B
Unit C
Unit D
9k — —
—
12k — —
—
18k — —
—
9k
9k — —
9k
12k — —
9k
18k — —
12k
12k — —
12k
18k — —
18k
18k — —
9k
9k
9k
—
9k
9k
12k — 9k
9k
18k
—
9k
12k
12k
—
12k
12k
12k
—
QUA(1x4)
9k
9k
9k
9k
6. Indoor units combination
NOTE: The total capacity of indoor air handlers can not exceed the nominal capacity of the outdoor unit.
The minimum quantity of indoor air handlers is one on any outdoor unit, whether it is a dual, tri, or quad
zone.
6.1 Indoor unit combinations for A-VMH18DC-1
Comb.
Dual(1x1)
Dual (1x2)
6.2 Indoor unit combinations A-VMH27TC-1
Comb.
TRI (1x1)
TRI (1x2)
6.3 Indoor unit combinations A-VMH36QC-1
Comb.
QUA (1x1)
QUA (1x2)
QUA (1x3)
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Heat Controller, Inc. VMH SerieS Service Manual
N.m
N.m
provided with all 12/18k indoor sections.
7. Installation Details
7.1 Wrench torque sheet for installation
Outside diameter Torque Additional tightening torque
mm inch
Ф6.35 1/4 15(153kgf.cm) 16(163kgf.cm)
Ф9.52 3/8 25(255kgf.cm) 26(265kgf.cm)
Ф12.7 1/2 35(357kgf.cm) 36(367kgf.cm)
7.2 Connecting the cables
The power wiring should always follow NEC and local codes, with respect to the unit’s, rating plate. See
installation manual for additional information. Main power connection is 208/230V/1PH~60HZ.
The communicating cable, which connects between the indoor and outdoor units must meet all NEC and
local codes, with respect to the unit’s rating plate. We recommend using 14 AWG/4 conductor Stranded THHN
6
Ф Ф V cable.
Pipe length and elevation
Pipe size
Unit
Gas inch
(mm)
Liquid inch
(mm)
9K 3/8’’ (Ф9.52) 1/4’’ (Ф6.35)
12K/18K 1/2’’ (Ф12.7) 1/4’’ (Ф6.35)
Max. Total length for all rooms
Standard
length
(m)
(5)
16.5ft
Dual-zone(m) Tri-zone(m) Quad-zone(m)
Max.
Elevation
B (m)
(10)
33ft
Max.
Length
A (m)
(15)
50ft
Additional
refrigerant
(g/m)
(20)
0.2 oz/ft
(30)100ft (45)150ft (60)200ft
2XWGRRUXQLW
$
2LOWUDS
,QGRRUXQLW
%
NOTES:
Capacity test is based on standard length and maximum allowance length is based on reliability.
Oil trap should be installed per (3-5 meters)10-15ft.
Outdoor connections are ¼” (Ф6.35 mm) liquid and 3/8” (Ф9.52 mm) gas, therefore a reducer is
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Service Manual VMH SerieS Heat Controller, Inc.
Hi
Compound meter
Pressure
7.4 Installation for the first time
Air and moisture in the refrigerant system have undesirable effects as indicated below:
● Pressure in the system rises.
● Operating current rises.
● Cooling or heating efficiency drops.
● Moisture in the refrigerant circuit may freeze and block capillary tubing.
● Water may lead to corrosion of parts in the refrigerant system.
Therefore, the indoor units and the pipes between indoor and outdoor units must be leak tested and
evacuated to remove gas and moisture from the system.
Gas leak check (Soap water method):
Apply soap water or a liquid neutral detergent on the indoor unit connections and outdoor unit
connections with a soft brush to check for leakage on the connecting points of the piping. If air bubbles
come out, the connections have leaks and those connection points must be tightened. Recheck to
ensure all leakage points are tightened properly and not leaking.
1. Air purging with vacuum pump
Vacuum
pump
Vacuum
pump
(Indoor unit)
-0.1MPa
Handle Lo
Charge hose
(Liquid side)
(Gas side)
Manifold valve
Lo
Charge hose
(Outdoor unit)
Two-way valve
Close
Three-way valve
Close
gauge
Handle Hi
1) Completely tighten the flare nuts of the indoor and outdoor units, confirm that both the 2-way and
3-way valves are set to the closed position.
2) Connect the charge hose with the push pin of handle lo to the 3-way valves gas service port..
3) Connect the charge hose of handle hi connection to the vacuum pump.
4) Fully open the handle Lo of the manifold valve.
5) Operate the vacuum pump to evacuate.
6) Conduct evacuation for 30 minutes and check whether the compound meter indicates -0.1Mpa. If
the meter does not indicate -0.1Mpa after pumping 30 minutes, it should be pumped 20 minutes more. If
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Heat Controller, Inc. VMH SerieS Service Manual
the pressure can’t achieve -0.1Mpa after pumping 50 minutes, please check if there are some leakage
points. Once the meter indicates -0.1mpa, fully close the handle Lo valve of the manifold valve and stop
the operation of the vacuum pump. Confirm that the gauge needle does not move (approximately 5
minutes after turning off the vacuum pump).
7) Turn the flare nut of the 3-way valves about 45° counterclockwise for 6 or 7seconds after the gas
comes out, then tighten the flare nut again. Make sure the pressure display in the pressure indicator is a
little higher than the atmospheric pressure. Then remove the charge hose from the 3 way valve.
8) Fully open the 2 way valve and 3 way valve and securely tighten the cap of the 3 way valve.
2. Air purging by refrigerant
Procedure:
1). Confirm that both the 2-way and 3-way valves are set to the closed position.
2). Connect the charge set and a charging cylinder to the service port of the 3-way valve.
3). Air purge by open the valves on the charging cylinder and the charge set. Purge the air by loosening
the flare nut on the 2-way valve approximately 45° for 3 seconds then closing it for 1 minute; repeat 3
times. After purging the air, use a torque wrench to tighten the flare nut on the 2-way valve.
4). Check for gas leakage by checking the flare connections using the soap water method.
5). Discharge the refrigerant by closing the valve on the charging cylinder and discharging the refrigerant
by loosening the flare nut on the 2-way valve approximately 45° until the gauge indicates 0.3 to 0.5 Mpa.
6). Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the open
position.
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Service Manual VMH SerieS Heat Controller, Inc.
7). Replace the valve stems nuts and the service port cap that were previously removed.
Be sure to use a torque wrench to tighten the service port cap to a torque of 18N·m.
Be sure to check for gas leakage using soap water.
3. Adding the refrigerant if the pipe length >(5m)16.5ft
Electronic scale
Procedure:
1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve.
Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of
the cylinder. Because refrigerant is R410A, turn the cylinder upside down, ensuring the bottom is upward,
to create a liquid charge.
2). Purge the air from the charge hose.
Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air
(be careful of the liquid refrigerant).
3) Put the charging cylinder onto the electronic scale and record the weight.
4) Operate the air conditioner in the cooling mode.
5) Open the valves (Low side) on the charge set and charge the system with the proper amount (refer to
table) liquid refrigerant.
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Heat Controller, Inc. VMH SerieS Service Manual
6).When the electronic scale displays the proper weight (refer to the table), disconnect the charge hose
from the 3-way valve’s service port immediately and turn off the air conditioner before disconnecting the
hose.
7). Replace the valve stem caps and the service port that were previously removed.
Use torque wrench to tighten the service port cap to a torque of 18N.m.
Be sure to check for gas leakage using soap water.
7.5 Adding the refrigerant due to loss of charge
Electronic scale
Procedure:
1). Connect the charge hose to the 3-way service port, open the 2-way valve and the 3-way valve.
Connect the charge hose to the valve at the bottom of the cylinder. Because the refrigerant is R-410A,
turn the cylinder upside down, such that the bottom is upward, to ensure a liquid charge.
2). Purge the air from the charge hose.
Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air
(Do not vent refrigerant into the atmosphere).
3) Put the charging cylinder onto the electronic scale and record the weight.
4) Operate the air conditioner in the cooling mode.
5) Open the valves (Low side) on the charge set and charge the system with liquid refrigerant, (refer to
the gauge and the pressure of the low side).
6).When the electronic scale displays the proper weight (refer to the gauge and the pressure of the low
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Service Manual VMH SerieS Heat Controller, Inc.
side), disconnect the charge hose from the 3-way valve’s service port immediately and turn off the air
conditioner before disconnecting the hose.
7). Replace the valve stem caps and the service port that were previously removed.
.
Use torque wrench to tighten the service port cap to a torque of 18N
m.
Be sure to check for gas leakage using soap water.
7.6 Replacing the indoor unit
1. Collecting the refrigerant into the outdoor unit
Procedure
1). Confirm that both the 2-way and 3-way valves are set to the open position
Remove the valve stem caps and confirm that the valve stems are in the open position.
Be sure to use a hexagonal wrench to operate the valve stems.
2). Connect the charge hose with the push pin of handle lo to the 3-way valves gas service port.
3). Air purging of the charge hose.
Open the handle Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds
and then close it quickly.
4). Set the 2-way valve to the closed position.
5). Operate the air conditioner in the cooling cycle and stop it when the gauge indicates 0.1MPa.
6). Set the 3-way valve to the closed position immediately
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Heat Controller, Inc. VMH SerieS Service Manual
Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa.
Disconnect the charge set, and tighten the 2-way and 3-way valve’s stem nuts.
Use a torque wrench to tighten the 3-way valves service port cap to a torque of 1.8 N.m.
Be sure to check for gas leakage using soap water.
7). Remove the defective indoor unit and install the new indoor unit. Follow the next set of procedures to
charge.
2. Air purging by the refrigerant
Procedure:
1). Confirm that both the 2-way and 3-way valves are set to the closed position.
2). Connect the charge set and a charging cylinder to the service port of the 3-way valve
Leave the valve on the charging cylinder closed.
3). Air purging.
Open the valves on the charging cylinder and the charge set. Purge the air by loosening the flare nut on
the 2-way valve approximately 45° for 3 seconds then closing it for 1 minute; repeat 3 times.
After purging the air, use a torque wrench to tighten the flare nut on the 2-way valve.
4). Check the gas leakage
Check the flare connections for gas leakage using soap water.
5). Discharge the refrigerant into charging cylinder.
Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the
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Service Manual VMH SerieS Heat Controller, Inc.
2-way valve approximately 45° until the gauge indicates 0.3 to 0.5 Mpa.
6). Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the open
position
Be sure to use a hexagonal wrench to operate the valve stems.
7). Replace the valve stems nuts and the service port cap that were previously removed.
Be sure to use a torque wrench to tighten the service port cap to a torque 18N.m.
Be sure to check the gas leakage using soap water.
7.7 Replacing the outdoor unit
1. Evacuation for the whole system
Procedure:
1). Confirm that both the 2-way and 3-way valves are set to the open position.
2). Connect the vacuum pump to 3-way valve’s service port.
3). Evacuate for approximately one hour. Confirm that the compound meter indicates -0.1Mpa.
4). Close the valve (Low side) on the charge set, turn off the vacuum pump, and confirm that the gauge
needle does not move (approximately 5 minutes after turning off the vacuum pump).
5). Disconnect the charge hose from the vacuum pump.
6). Remove the defective outdoor unit and install the new unit. See the following instructions for
re-charging the new unit.
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Heat Controller, Inc. VMH SerieS Service Manual
2. Refrigerant charging
Procedure:
1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve
Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of
the cylinder. Because the refrigerant is R-410A, turn the cylinder upside down, such that the bottom is
upward, to ensure a liquid charge.
2). Purge the air from the charge hose
Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air
(Do not vent refrigerant into the atmosphere).
3) Put the charging cylinder onto the electronic scale and record the weight.
4). Open the valves (Low side) on the charge set and charge the system with liquid refrigerant
If the system cannot be charge with the specified amount of refrigerant, or can be charged with a little at
a time (approximately (150g),5oz. each time) , operating the air conditioner in the cooling cycle. Wait
approximately 1 minute and then repeat the procedure as needed.
5).When the electronic scale displays the proper weight, disconnect the charge hose from the 3-way
valve’s service port immediately
If the system has been charged with liquid refrigerant while operating the air conditioner, turn off the air
conditioner before disconnecting the hose.
6). Replace the valve stem caps and the service port that were previously removed.
Use torque wrench to tighten the service port cap to a torque of 18N.m.
Be sure to check for gas leakage using soap water.
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Service Manual VMH SerieS Heat Controller, Inc.
No.SW1
Display
Remark
Amendatory capacity demand code
Evaporator outlet temp. for 1# indoor unit
Actual data is measured, however due to display limitations
Condenser pipe temp.
the digital display shows “0.5”, it means the compressor
8. Electronic control function
8.1 Abbreviations
T1: Indoor ambient temperature
T2: Coil temperature of indoor heat exchanger middle.
T2B: Coil temperature of indoor heat exchanger outlet.
T3: Coil temperature of outdoor heat exchanger
T4: Outdoor ambient temperature
T5: Compressor discharge temperature
Ts: Set point temperature.
8.2 Electric control working environment.
8.2.1 Input voltage: 230V.
8.2.2 Input power frequency:60Hz.
8.2.3 Indoor fan normal working amperage. is less than 1A.
8.2.4 Outdoor fan normal working amperage. is less than 1.5A.
8.2.5 Four-way valve normal working amperage. is less than 1A.
8.2.6 Swing motor: 12V DC.
8.3 Outdoor unit’s digital display
There is a digital display tube in outdoor PCB.
Digital display functions:
• In standby , the LED displays “- -”
• When compressor is operating, the LED displays the running frequency,
• In defrosting mode, The LED displays “dF” or alternatively displays between running frequency and
“dF”(each displays 2s)
• In compressor pre-heating, The LED displays “- -”
• In protection or malfunction modes, the LED displays the associated error code or protection code.
8.4 Outdoor unit point check function
There is a check switch in outdoor PCB.
Push the switch SW1 to check the states of unit when the unit is running. The digital display will display the
following each time the SW1 switch is preserved.
Pressed
10
11
Indoor unit capacity demand code
1
Outdoor unit running mode code Off:0, Cooling:1, Heating:2
2
3
Outdoor unit fan motor state Off:0, Low speed:1, High speed:2
4
5
Evaporator outlet temp. for 2# indoor unit
6
Evaporator outlet temp. for 3# indoor unit
7
Evaporator outlet temp. for 4# indoor unit
8
9
Ambient temp.
Compressor discharge temp. Actual data is measured, however due to display limitations
if the temp. is lower than -9 degrees, the digital display will
show “-9”. If the temp. is higher than 70 degrees, the digital
display will show “70”. If the indoor unit is not connected, the
digital display tube will show: “- -“.
if the temp. is lower than 0 degrees, the digital display will
show “0”. If the temp. is higher than 99 degrees, the digital
display will show single digit and a tens digit. For example if
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Heat Controller, Inc. VMH SerieS Service Manual
connected, the digital display tube will show: “- - “.
12
Inverter current
AD data
EXV open angle for 1# indoor unit
Actual data, divide this number by 8 for actual angle valve is
open.
15
EXV open angle for 3# indoor unit
18
Indoor unit number
The indoor unit can communicate with outdoor unit well.
19
The last error or protection code
00 means no malfunction
21
Ambient temp. of 1# indoor unit
Actual data
22
Condenser pipe temp. of 1# indoor unit
Actual data
――
Check point over
discharge temp. is 105 degree. If the indoor unit is not
13
14
16
17
20
23
24 Condenser pipe temp. of 2# indoor unit Actual data
25 Ambient temp. of 3# indoor unit Actual data
26
27 Ambient temp. of 4# indoor unit Actual data
28 Condenser pipe temp. of 4# indoor unit Actual data
29
EXV open angle for 2# indoor unit Actual data divide 8
Actual data divide 8
Actual data divide 8
EXV open angle for 4# indoor unit
Power supply of outdoor unit AD data (AD data*472/255=actual data)
frequency value Actual data
Ambient temp. of 2# indoor unit Actual data
Condenser pipe temp. of 3# indoor unit Actual data
The following items from 6.4.1 to 6.4.6 are for the explanation of the point check functions.
8.4.1 Frequency of compressor:
Display Frequency of compressor (Hz)
30 30
-- Stand by
60 60
8.4.2 Running mode:
Display Corresponding mode
0 Off
1 Cooling mode
2 Heating mode
8.4.3 Capacity demand:
Cooling mode
Capacity 2000-
2500
Corresponding
Code
1 2 3 4 5 6 7 8 9 >=10
Heating mode
Capacity 2000-25
Corresponding
Code
00
1 2 3 4 5 6 7 8 9-10 >=11
Note:
The capacity is just for reference.
2000-
2500
2000-25
00
3000-
3800
3000-38
00
4500-
5000
4500-50
00
5000-
5500
5500-61
00
5500
-6100
6100-70
00
6100-
7000
6100-70
00
7000-
7500
7000-75
00
7500-
8000
7500-80
00
>7500
>8000
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Service Manual VMH SerieS Heat Controller, Inc.
8.4.4Number of indoor units – displays how many indoor units the outdoor unit is communicating with.
Display Quantity of indoor unit
1 1
2 2
3 3
4 4
8.4.5 Opening degree of electronic expansion valve:
Actual opening degree value equals the display data divided 8
8.5 Protection
8.5.1 Three minutes delay at restart for compressor.
8.5.2 Temperature protection of compressor discharge.
When the compressor discharge temp. is getting higher, the running frequency will be limited as below rules:
----If 216°F<T5< 239°F (102°C<T5<115°C), the frequency or the compressor will decrease to a lower level
every 2 minutes until it reaches F1.
---If T5>239°F(T5>115°C) for 10 seconds, the compressor will stop and restart till T5<194°F (T5<90°C).
8.5.3 Low voltage protection
VOLTAGE
VOLREL1
VOLREL2
VOLREL3
VOLLIMT1
VOLLIMT2
VOLLIMT3
No limit
VOLFRE1
VOLFRE2
Off
Model VOLLIMT1 VOLLIMT2 VOLLIMT3 VOLREL1 VOLREL2 VOLREL3 VOLFRE1 VOLFRE2
A-VMH18DC-1 230 200 120 260 210 135 62 54
A-VMH27TC-1 245 220 120 265 240 135 78 45
A-VMH36QC-1 200 185 120 210 195 135 54 42
Note: if the low voltage protection occurs and does not resume within 3min, it will keep the protection after
the machine is restarted.
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Heat Controller, Inc. VMH SerieS Service Manual
8.5.4 Compressor current limit protection
If the compressor current exceeds the current limit value for 10 seconds, the compressor frequency will be
limited per the table below.
Cooling mode:
Current frequency(Hz) Current limit value(A) Frequency limit
COOL_F10 ICOOLLMT6
COOL_F9 ICOOLLMT5
COOL_F8 ICOOLLMT4
COOL_F7 ICOOLLMT3
COOL_F6 ICOOLLMT2
COOL_F5 ICOOLLMT1
If the current frequency is lower than COOL_F4, the frequency will not be limited.
After 10s of the compressor start, if the current>ICOOL,the AC will display the failure for 30 seconds and stop. The AC will restart 3
minutes later and re-check.
The compressor frequency will decrease to COOL_F4 and
then run at COOL_F4 for 3 minutes.
After that, the frequency will be adjusted according to the
capacity demand, then rise to the next level up every 3
minutes (When the frequency>COOL_F4 via capacity
demand).
Heating mode:
Current frequency(Hz) Current limit value(A) Frequency limit
HEAT_F12 IHEATLMT8 The compressor frequency will decrease HEAT _F4 and
HEAT_F11 IHEATLMT7
HEAT_F10 IHEATLMT6
HEAT_F9 IHEATLMT5
HEAT_F8 IHEATLMT4
HEAT_F7 IHEATLMT3
HEAT_F6 IHEATLMT2
HEAT_F5 IHEATLMT1
If the current frequency is lower than HEAT_F4, the frequency will not be limited.
After 10s of the compressor start, if the current>IHEAT,the AC will display the failure for 30 seconds and stop. The AC will restart 3
minutes later and re-check.
then run at HE AT_F4 for 3 minutes.
After that, the frequency will be adjusted according to the
capacity demand, then rise to the next level up every 3
minutes (When the frequency>Heat_F4 via capacity
demand).
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Service Manual VMH SerieS Heat Controller, Inc.
Model
RECOILINFRE
8.5.5 Indoor / outdoor units communication protection
If any indoor unit can not receive the feedback signal from the outdoor unit for 2 minutes, the AC will stop
and display the failure code.
8.5.6 High condenser coil temp. protection.
When T3>149°F(T3>65°C) for 3 seconds, the compressor will stop while the indoor fan and outdoor fan will
continue.
When T3<126°F(T3<52°C), the protection will release and the compressor will restart after 3 minutes.
8.5.7 Outdoor unit anti-freezing protection
When T2B<32°F(T2B<0°C) for 4 minutes, the indoor unit capacity demand will be zero and resume to
normal when T2B>50°F(T2B>10°C).
8.5.8 Oil return
Running rules:
1. If the compressor frequency remains lower than RECOILINFRE for 2hours,the AC will increase the
frequency to RECOILFRE for 3mins and then resume to the former frequency.
A-VMH18DC-1 45
A-VMH27TC-1 45
A-VMH36QC-1 40
2. During the oil return process, the EXV and indoor units continue with the current running mode, the
frequency will not be limited by the compressor discharge temp. or the current.
8.5.9 Compressor preheating functions
----Preheating permitting condition:
If T4(outdoor ambient temperature) T4＜37.4°F(T4＜3°C) and newly powered on or if T4＜37.4°F(T4＜3°C)
and compressor has stopped for over 3 hours, the compressor’s crank case heater will begin to operate.
----Preheating mode:
A weak current flow through the coil of compressor from the wiring terminal of compressor, heats the
compressor without it operating via the crankcase heater.
----Preheating release condition:
If T4>41°(T4>5°C) or the compressor starts running, preheating function will stop.
8.5.10 Compressor crankcase heater
When T4<37.4°(T4<3°C) and the compressor is not running, the crankcase heater will be active.
When T4≧41°(T4≧5°C) or the compressor starts up, the crankcase heater will stop working.
24
Heat Controller, Inc. VMH SerieS Service Manual
9. Troubleshooting
9.1 Indoor Mini-Split error code explanations:
Indoor Error
Code
E0
E1 Indoor/ outdoor unit communication error ——
E2 Zero-crossing signal error ——
E3 Indoor fan speed has been out of control ——
E5
E6 Open circuit or short circuit of T1 or T2 temperature sensor ——
P0 IPM module protection or IGBT over-strong current protection P4
P1 Voltage protection E5
P2 Temperature protection of compressor top P0,P1,P2
P3 Outdoor temp. too low protection(Optional for some models) ——
P4 Inverter compressor drive protection E7, P7
P5 Mode conflict ——
LED STATUS
Indoor EEPROM malfunction ——
Open circuit or short circuit of outdoor temperature sensor or outdoor
EEPROM malfunction
Corresponding
Outdoor Error code
E0,E1,E2,
E3,E4,E6
Indoor Ceiling Cassette error codes:
Operation Timer De-frost Alarm LED STATUS
★
X X
X
X X X
★ ★
★
★
★
X X X Open or short circuit of T1 temperature sensor
★
★
X X
X X Indoor / outdoor units communication error
X X Indoor EEPROM malfunction
X X Open or short circuit of T3 or T4 temperature sensor
X
★ ★ ★ ★
★
X
X Open or short circuit of T2 temperature sensor
★
Full-water malfunction
IPM module protection
Voltage protection
Temperature protection of compressor top.
Mode conflict
★
X Inverter compressor drive protection
★ flash at 2.5Hz, light, X extinguished.
25
Service Manual VMH SerieS Heat Controller, Inc.
coil outlet temp. sensor or connector of
r or connector of
coil outlet temp. sensor or connector of
board and
Temperature protection of
9.2 Outdoor unit error code explanation:
Outdoor
Error
Code:
E0 Outdoor EEPROM malfunction E5
Indoor unit A’s
E1
sensor is defective
Indoor unit B’s coil outlet temp. sensor or connector of
E2
sensor is defective
Indoor unit C’s coil outlet temp. senso
E3
sensor is defective
Indoor unit D’s
E6
sensor is defective
E4 Open or short circuit of outdoor unit temperature sensor E5
LED STATUS
Corresponding Indoor
Mini-Split error code
E5
E5
E5
E5
E5 Voltage protection P1
E7
P0
P1 High pressure protection (Only for A-VMH-36QC-1) P2
P2 Low pressure protection (Only for A-VMH-36QC-1) P2
P3 Current protection of compressor ——
P4 IPM module protection P0
P6 High temperature protection of condenser ——
P7 Inverter compressor drive protection P4
PF PFC module protection (A-VMH36QC-1) ——
Communication malfunction between IPM
outdoor main board
Temperature protection of compressor discharge or
compressor top.
For A-VMH-36QC-1 it means
compressor discharge
P4
P2
26
Heat Controller, Inc. VMH SerieS Service Manual
9.3 Trouble shooting
9.3.1 Indoor unit trouble shooting
9.3.1.1 Indoor EEPROM malfunction
Shut off the power supply and
turn it on 1 minute later. Is it
still displaying the error code?
Yes
If the EEPROM chip
is welded on PCB,
replace the PCB
directly. Otherwise,
check whether the
EEPROM chip
plugged in PCB well?
Yes
Replace the indoor PCB.
No
EEPROM: a read-only memory chip whose contents can be erased and reprogrammed using a pulsed
Insert the EEPROM well
Re-insert the EEPROM well
voltage.
(EERROM chip may be solid for some models)
27
Service Manual VMH SerieS Heat Controller, Inc.
Check wiring on the outdoor
minal follow the
iring diagram. Are all wires
s wit h
Are
no. of outdoor units
Measure Vs, is it moving
(Vs is the voltage between
Turn off the all indoor
Is PFC power LED lamp
Are number of indoor units
heck on the
nt (18). (2
zone, 4
Is Main board
lamp on?
Is all the wiring
between terminal
and Indoor PCB
Change the
wer on by remote
the E1
error code ended
after 3 minutes?
eactor
hange Outdoor Main
outdoor unit PCB
9.3.1.2 Indoor / outdoor units communication error
Power off , then Power on the A/C by the
Breaker. Did E1 error code turn off?
No
and indoor ter
w
connected correctly?
Yes
Turn on all indoor unit
the remote controller.
correct? Refer to PIC 5.
Yes
units. Is IPM power LED
Yes
No
No
change
IPM
Yes
No
Reconnect the wiring
Reconnect the wiring
alternately between positive
value and negative value?
Yes
A:
No
No
Yes
off? Refer PIC 3.
Yes
“ "
Yes
correct? C
outdoor check poi
for dual zone, 3 for tri
for qua zone). Refer PIC 5.
No, fist time
Change
assembly(include wiring) totally
No
change
PFC
Reconnect the wiring
Is the r
connecting well？
C
PCB
No, second time
Yes
Yes
No
No No
E1 error problem solved.
SEE A
Indoor PCB
Po
controller, has
Yes
28
Heat Controller, Inc. VMH SerieS Service Manual
check how many indoor units are
Pic 1: Measure the voltage of L2 to S (Vs), is it
moving alternately between positive value and
negative value?
PIC 3: IPM (For dual/tri/quad-zone)
PIC4: Main board LED when power on and unit standby.
PIC 2, Check the wiring.
PFC (quad-zone only)
PIC 5: check point bottom,
press 18 times to
connected.
29
Service Manual VMH SerieS Heat Controller, Inc.
Correct the connections
Shut off the power supply, rotate the fan
rubbing/obstructions?
9.3.1.3 Zero-crossing signal error
Check if the connections and
power supply is normal?
Indoor PCB is defective.
Replace indoor PCB.
are normal?
Yes
No
Correct the connections. Turn on the unit
Correct the connections. Turn on the
when the power supply is within 90-110% of
unit when the power supply is good.
rated voltage on unit’s rating plate.
9.3.1.4 Indoor fan speed has been out of control(DC fan motor)
Shut off the power supply and
turn it on 5 seconds later. Is it
still displaying the error code?
Yes
No
The unit operates normally.
Shut off the power supply,
rotate the fan by hand. Does
by hand. Does it rotate freely with any
it rotate properly?
Yes
Check the wires of fan motor.
Are all the connections good?
Yes
Check the voltage between port
1 and 6 of fan motor connector,
is it 310V?
No
Replace indoor main PCB. Is it
still displaying the error code?
No
No
Correct the connections.
No
Replace indoor fan
per wiring diagram.
The unit operates normally.
motor.
Yes
DC motor voltage input and output
5
4
6
1
3
2
NO. Color Signal Voltage
1 Red VDC 310V
2 --- --- ---
3 White Vcc 15V
4 Blue FG 0.3V
5 Yellow Vsp 0-7.5V
6 Black GND 0V
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Heat Controller, Inc. VMH SerieS Service Manual
9.3.1.5 Indoor fan speed has been out of control(AC fan motor)
Shut off the power supply
and turn it on 5 seconds
later.Is it still displaying
the error code?
Yes
No
The unit operates normally.
Shut off the power
supply, rotate the cross
fan by hand. Does it
rotate properly?
freely?
Yes
Check the wires of
fan motor. Are all the
connections good?
Yes
Check the resistance value of
indoor fan motor, is it normal?
Yes
Replace indoor PCB.
No
No
Disassembly the
connection between
fan and motor, check if
the bearing is normal?
Correct the connections
Correct the connections.
per wiring diagram.
No
No
Yes
Replace indoor fan motor.
Replace the bearing.
31
Service Manual VMH SerieS Heat Controller, Inc.
Correct the connections per
Is
Is
9.3.1.6 Open or short circuit of temperature sensor.
Check the connections
between temperature
sensor and PCB. Are
the connections good?
No
Correct the connections.
wiring diagram.
Yes
Check the resistance value
of the sensor via Appendix
Yes
Replace indoor or outdoor PCB.
1, is it normal?
No
Replace the sensor and
Replace the sensor
check if the problem
happen again?
9.3.1.7 Full-water malfunction (For Ceiling Cassette)
If the water-level switch
Is
is inserted well?
Yes
If the water-level switch
is broken?
No
If the water pump is
normal?
Yes
No
Yes
No
Insert the water-level switch well
Re-insert the water-level switch well
Replace the water-level switch
Replace the water pump
Check PCB board or replace the indoor main PCB
32
Heat Controller, Inc. VMH SerieS Service Manual
If the EEPROM chip is welded on
9.3.1.8 Outdoor temp. too low protection(Optional for some models)
Check if the outdoor ambient
temperature is beyond the normal
operation temperature range.
No
Replace the outdoor ambient
temperature sensor.
Yes
9.3.2 Outdoor unit trouble shooting
9.3.2 1 Outdoor EEPROM malfunction (ODU E0)
Outdoor EEPROM malfunction
PCB, replace the PCB directly.
Otherwise, check whether the
EEPROM chip plugged in PCB
well?
Turn on the unit when outdoor
ambient temperature is in normal
operation temperature range.
No
Re-insert the EEPROM well
Insert the EEPROM well
Yes
Replace the outdoor main board
33
Service Manual VMH SerieS Heat Controller, Inc.
9.3.2.2 Voltage protection (ODU E5)
Voltage protection
Check the voltage of
outdoor unit power supply,
whether the voltage
between L(L1) and N (L2) is
about 220~240VAC
Yes
Check whether the voltage
of IPM board P and N is
normal? DC277-356V for
18-27KBtu/h; DC277-410V
for 36KBtu/h
No
Check the power supply
No
Replace bridge rectifiers,
and then check whether the
system can run normally
No
Replace IPM board, and
then check whether the
system can run normally
No
Replace outdoor main board
Yes
Yes
Yes
Trouble is solved
34
Heat Controller, Inc. VMH SerieS Service Manual
lit?
9.3.2.3 Communication malfunction between IPM board and outdoor main board(ODU E7)
Communication malfunction between
IPM board and outdoor main board
Is there at least one LED in
the IPM board light?
No
Check the signal wire between
the IPM module and the main
board, is it connected good?
Yes
No
Reconnect and retry. Is
error still display?
displaying?
No
Replace IPM board, and
then check whether the
system can run normally
No
Replace outdoor main
board, and then check
whether the system can run
normally
No
Yes
No
Yes
Yes
Replace the electric control
box
Trouble is solved
35
Service Manual VMH SerieS Heat Controller, Inc.
9.3.2.4 Temperature protection of compressor discharge (ODU P0)
Temperature protection of
compressor discharge
Check whether the
compressor discharge temp.
is more than 239°F (115°C)?
No
Check whether the wiring
connection is correct between
compressor discharge temp.
sensor and PCB according to
wiring diagram?
Yes
The discharge temp.
sensor may be
broken.
Check whether the
resistance of compressor
discharge temp. sensor is
right refer to the Appendix 2
No
Check whether there is
a refrigerant leak
No
Correct the wiring connection
Replace the compressor discharge temp. sensor
YesYes
Stop leak and add refrigerant as needed
Yes
Replace outdoor main board
36
Heat Controller, Inc. VMH SerieS Service Manual
9.3.2.5 Temperature protection of compressor top (ODU P0)
Temperature protection of
compressor top
Does the compressor
operate?
Yes
Is the unit properly
charged?
No
Properly charge the system
Is there any abnormality of
operation after the system
was charged?
Are all
connections correct?
Yes
Check whether protector is
normal? If protector is normal,
resistance=0
Yes
Replace the outdoor main PCB
NoNo
Reconnect and retest.
No
Replace the protector.
No
Check refrigerant circuit,
such as clogging of
capillary tubes etc.
37
Service Manual VMH SerieS Heat Controller, Inc.
9.3.2.6 High pressure protection (ODU P1) (Only for A-VMH36QC-1)
High pressure protection
Is the wiring between
the high pressure switch
and main control board is
connected correctly?
Yes
Is the high pressure
protector broken?
Yes
Short circuit the high
pressure protector socket,
check whether the system
can run normally now?
No
No
Yes
Reconnect it properly
Replace high pressure protector
Check whether
the refrigerant
system is ok
Check whether the
outdoor ambient
temperature is higher than
109.4°F (43°C)?
No
Check whether the outdoor
unit’s airow is obstructed
No
Check whether the heat
exchanger is dirty
No
Check whether the
refrigerant circuit has a
blockage
No
Yes
Yes
Yes
Yes
Stop the unit
Remove all obstructions for proper ventilation
Clean the heat exchanger
Evacuate the refrigerant, then use
high pressure nitrogen or refrigerant
to blow pipe, vacuum and recharge
with refrigerant again
Replace outdoor main board
38
Heat Controller, Inc. VMH SerieS Service Manual
9.3.2.7 Low pressure protection (ODU P2) (Only for A-VMH36QC-1)
Low pressure protection
Is the wiring between the
low pressure protector
and main control board
connected correctly?
Yes
Is the low pressure
protector broken?
Yes
Short circuit the low
pressure protector socket,
check whether the system
can run normally now?
No
No
Yes
Reconnect it properly
Replace low pressure protector
Check whether
the refrigerant
system is ok
Check whether the
outdoor ambient
temperature is to low
No
Check if there is
a refrigerant leak
Connect the pressure gauge to
the gauge joint of the system,
check whether the pressure is
lower than 0.14MPa
No
Check whether the
refrigerant circuit is
blocked or not
No
Yes
Yes
Yes
Stop the unit
Find the leak by charging nitrogen or refrigerant
into the system, if the leak is serious there will be
distinct “hissing” sound; if the leakage is small, use a
soap and water mixture or electronic leak detector
to nd the leak and repair.
Evacuate the refrigerant, then use
high pressure nitrogen or refrigerant
to blow out pipe, vacuum and
recharge with refrigerant again
Replace outdoor main board
39
Service Manual VMH SerieS Heat Controller, Inc.
9.3.2.8 Current protection of compressor (ODU P3)
Current protection of compressor
Check whether the input
current of the power supply
wire is more than 12.5A
(For 27K, it is 14.5A, For
36K, it is 20A)
Yes
Check whether the
refrigerant system is ok
Check whether the
outdoor ambient
temperature is higher than
122.4°F (50°C)?
No
Yes
Stop the unit
Check whether the outdoor
unit’s airow is obstructed
No
Check whether the heat
exchanger is dirty
No
Is the refrigerant
circuit blocked?
No
Replace outdoor main
board, and check
whether the system can
run normally
No
Yes
Yes
Yes
Remove all obstructions for proper ventilation
Clean the heat exchanger
Evacuate the refrigerant, then use
high pressure nitrogen or refrigerant
to blow pipe, vacuum and recharge
with refrigerant again
Replace the electrical
control box
40
Heat Controller, Inc. VMH SerieS Service Manual
9.3.2.9 IPM module compressor (ODU P4)
IPM module protection
Check whether the voltage range
of P-N on IPM module is normal?
DC277-356V for 18-27KBtu/h;
DC277-410V for 36KBtu/h
Yes
Check whether the
connecting line between main
board and the IPM module is
connected tightly
Yes
Check whether the
connecting line of the
compressor is connected
correctly or tightly
Yes
Replace the IPM module,
check whether the system
can work normally?
No
No
No
No
No
Check whether the
No No
input power supply is
correct? 220-240V,
1PH 60Hz
Yes
Connect it tightly,
check ok or not?
Check whether the
power supply line is
connected correctly
and tightly
Yes
Connect it well
check ok or not?
Check whether
the wires in E-part
box are connected
tightly
Yes No
Check whether the bridge rectiers
are normal? Use the multimeter to
measure the resistance between
each two terminals, check whether
the value of resistance is 0
No
No
No
No
Regulate it to
correct, then check
whether the system
can work normally?
Connect it correctly
and tightly, check ok
or not?
Connect it tightly,
check ok or not?
No
Replace the main board;
check whether the system
can work normally?
No
Replace the compressor.
Check whether the connecting line
of every reactor is normal? If the
line is broken, the resistance of the
two ports is (for all models except
A-VMH36QC-1); Check whether the
PFC module broken A-VMH36QC-1
Yes
Replace the bridge rectiers
8
No
Replace the connecting
line or reactor or replace
Yes
the PFC module for a
A-VMH36QC-1
41
Service Manual VMH SerieS Heat Controller, Inc.
9.3.2.10 High temperature protection of condenser (ODU P6)
When outdoor pipe temp. is mroe than 149°F (65°C), the unit will stop, and will run again when outdoor
pipe temp. is less than 126°F (52°C).
High temperature
protection of condenser
Replace the temperature sensor
Check whether the
condenser temperature is
more than 149°F (65°C)
Yes
Check whether the
outdoor ambient temperature is
higher than 122°F (50°C)
No
Check whether the
heat exchanger is dirty
No
No
Yes
Yes
No
No
Check whether the
resistance of condenser
temp. sensor is correct
refer to the Appendix 1
Stop the unit
Clean the heat exchanger
Yes
Replace outdoor main board
No
The refrigerant
circuit is blocked
Yes
high pressure nitrogen or refrigerant to
blow out the pipes, vacuum and recharge
the refrigerant again
42
Evacuate the refrigerant, then use the
Heat Controller, Inc. VMH SerieS Service Manual
9.3.2.11 High PFC module protection (ODU P6) (Only for A-VMH36QC-1)
PFC module protecton
Check whether the connecting line
between main board and the PFC
module is connected tightly
Yes
Check whether the voltage range
of P-N on IPM module is normal?
DC277-356V for 18-27KBtu/h;
DC277-410V for 36KBtu/h
No
Check whether the inductance
of PFC module is good? If the
inductance is good, the resistance of
the two ports is 0
Yes
No
No
Yes
No
Connect it tightly,
check normal or not
Replace the outdoor main board
Replace the inductance
Replace the PFC module
9.3.2.12 Inverter compressor drive protection (ODU P7)
The trouble shooting is same process as the IPM module protection, trouble shooting.
Refer to this section.
43
Service Manual VMH SerieS Heat Controller, Inc.
K Ohm
K Ohm
K Ohm
K Ohm
-20
115.266
20
12.6431
60
2.35774
100
0.62973
-19
108.146
21
12.0561
61
2.27249
101
0.61148
-18
101.517
22
11.5000
62
2.19073
102
0.59386
-17
96.3423
23
10.9731
63
2.11241
103
0.57683
-16
89.5865
24
10.4736
64
2.03732
104
0.56038
-15
84.2190
25
10.000
65
1.96532
105
0.54448
-14
79.3110
26
9.55074
66
1.89627
106
0.52912
-13
74.5360
27
9.12445
67
1.83003
107
0.51426
-12
70.1698
28
8.71983
68
1.76647
108
0.49989
-11
66.0898
29
8.33566
69
1.70547
109
0.48600
-10
62.2756
30
7.97078
70
1.64691
110
0.47256
-9
58.7079
31
7.62411
71
1.59068
111
0.45957
-8
56.3694
32
7.29464
72
1.53668
112
0.44699
-7
52.2438
33
6.98142
73
1.48481
113
0.43482
-6
49.3161
34
6.68355
74
1.43498
114
0.42304
-5
46.5725
35
6.40021
75
1.38703
115
0.41164
-4
44.0000
36
6.13059
76
1.34105
116
0.40060
-3
41.5878
37
5.87359
77
1.29078
117
0.38991
-2
39.8239
38
5.62961
78
1.25423
118
0.37956
-1
37.1988
39
5.39689
79
1.21330
119
0.36954
0
35.2024
40
5.17519
80
1.17393
120
0.35982
1
33.3269
41
4.96392
81
1.13604
121
0.35042
2
31.5635
42
4.76253
82
1.09958
122
0.3413
3
29.9058
43
4.57050
83
1.06448
123
0.33246
4
28.3459
44
4.38736
84
1.03069
124
0.32390
5
26.8778
45
4.21263
85
0.99815
125
0.31559
6
25.4954
46
4.04589
86
0.96681
126
0.30754
7
24.1932
47
3.88673
87
0.93662
127
0.29974
8
22.5662
48
3.73476
88
0.90753
128
0.29216
9
21.8094
49
3.58962
89
0.87950
129
0.28482
10
20.7184
50
3.45097
90
0.85248
130
0.27770
11
19.6891
51
3.31847
91
0.82643
131
0.27078
12
18.7177
52
3.19183
92
0.80132
132
0.26408
13
17.8005
53
3.07075
93
0.77709
133
0.25757
14
16.9341
54
2.95896
94
0.75373
134
0.25125
15
16.1156
55
2.84421
95
0.73119
135
0.24512
16
15.3418
56
2.73823
96
0.70944
136
0.23916
17
14.6181
57
2.63682
97
0.68844
137
0.23338
18
13.9180
58
2.53973
98
0.66818
138
0.22776
19
13.2631
59
2.44677
99
0.64862
139
0.22231
Appendix 1 Temperature Sensor Resistance Value Table (℃--K) Use appendix 4 to convert °C to °F.
℃
℃
℃
℃
44
Heat Controller, Inc. VMH SerieS Service Manual
Appendix 2
Unit: °C ---K Discharge temp. sensor table
-20 542.7 20 68.66 60 13.59 100 3.702
-19 511.9 21 65.62 61 13.11 101 3.595
-18 483 22 62.73 62 12.65 102 3.492
-17 455.9 23 59.98 63 12.21 103 3.392
-16 430.5 24 57.37 64 11.79 104 3.296
-15 406.7 25 54.89 65 11.38 105 3.203
-14 384.3 26 52.53 66 10.99 106 3.113
-13 363.3 27 50.28 67 10.61 107 3.025
-12 343.6 28 48.14 68 10.25 108 2.941
-11 325.1 29 46.11 69 9.902 109 2.86
-10 307.7 30 44.17 70 9.569 110 2.781
-9 291.3 31 42.33 71 9.248 111 2.704
-8 275.9 32 40.57 72 8.94 11 2 2.63
-7 261.4 33 38.89 73 8.643 11 3 2.559
-6 247.8 34 37.3 74 8.358 11 4 2.489
-5 234.9 35 35.78 75 8.084 11 5 2.422
-4 222.8 36 34.32 76 7.82 11 6 2.357
-3 211.4 37 32.94 77 7.566 11 7 2.294
-2 200.7 38 31.62 78 7.321 11 8 2.233
-1 190.5 39 30.36 79 7.086 11 9 2.174
0 180.9 40 29.15 80 6.859 120 2.117
1 171.9 41 28 81 6.641 121 2.061
2 163.3 42 26.9 82 6.43 122 2.007
3 155.2 43 25.86 83 6.228 123 1.955
4 147.6 44 24.85 84 6.033 124 1.905
5 140.4 45 23.89 85 5.844 125 1.856
6 133.5 46 22.89 86 5.663 126 1.808
7 127.1 47 22.1 87 5.488 127 1.762
8 121 48 21.26 88 5.32 128 1.717
9 115.2 49 20.46 89 5.157 129 1.674
10 109.8 50 19.69 90 5 130 1.632
11 104.6 51 18.96 91 4.849
12 99.69 52 18.26 92 4.703
13 95.05 53 17.58 93 4.562
14 90.66 54 16.94 94 4.426
15 86.49 55 16.32 95 4.294 B(25/50)=3950K
16 82.54 56 15.73 96 4.167
17 78.79 57 15.16 97 4.045
18 75.24 58 14.62 98 3.927
19 71.86 59 14.09 99 3.812
R(90℃)=5KΩ±3%
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Service Manual VMH SerieS Heat Controller, Inc.
+
_
~
~
~
~
Appendix 3
1. Reference voltage data:
a) Rectifier : Input :220-230V(AC), output :310V(DC)
b) Inverter module: U,V, W 3ph.
Result
U-V 60-150V(AC)
U-W 60-150V(AC)
V-W 60-150V(AC)
P-N DC 310V
2. Check the Diode Bridge component ( In wiring diagram, rectifier)
Remark: If this part is abnormal, the LED will not light.
~ +
Multi-meter Result
- ~
Forward Resistance Backward Resistance
Infinite Infinite
~1.7M ohm Infinite
+
~1.7M ohm Infinite
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Heat Controller, Inc. VMH SerieS Service Manual
Appendix 4:
47
Service Manual VMH SerieS Heat Controller, Inc.
Appendix 5:
Spec.
Outdoor unit
Model 1x2 1x3 1x4
Compressor DA130S1C-20FZ DA150S1C-20FZ TNB306FPGMC-L
Outdoor fan motor YDK70-6FB YDK70-6FB YDK180-8GB
Indoor unit
Model 9k Mini-Split 12k Mini-Split 18k Mini-Split
Indoor fan motor RPG20B RPG20B RPG28H
Model / 12k Cassette 18k Cassette
Indoor fan motor / YDK45-6B YDK45-6B
1. Compressor checking
Measure the resistance value of each winding by using the tester.
Position Resistance Value
DA130S1C-20FZ DA150S1C-20FZ TNB306FPGMC-L
Blue - Red
0.95Ω(20℃) 0.95Ω(20℃) 0.53Ω(20℃)
48
Heat Controller, Inc. VMH SerieS Service Manual
2. Fan Motor.
Measure the resistance value of each winding by using the tester.
Position Resistance Value
YDK70-6FB YDK180-8GB YSK27-4G YSK68-4B YDK45-6B YSK25-6L
Black - Red
Red - Yellow
Yellow - Blue
Measure the resistance value of each winding by using the tester
56Ω±8%
(20℃)
76Ω±8%
(20℃)
76Ω±8%
(20℃)
24.5Ω±8%
(20℃)
19Ω±8%
(20℃)
19Ω±8%
(20℃)
Position Resistance Value
RPG20B RPG28H
Black - Red
White - Black
317Ω±8%
(20℃)
252Ω±8%
(20℃)
252Ω±8%
(20℃)
381Ω±8% (20℃) 183.6Ω±8% (20℃)
267Ω±8% (20℃) 206Ω±8% (20℃)
145Ω±8%
(20℃)
88Ω±8%
(20℃)
88Ω±8%
(20℃)
345Ω±8%
(20℃)
150Ω±8%
(20℃)
150Ω±8%
(20℃)
627Ω±8%
(20℃)
374.3Ω±8%
(20℃)
374.3Ω±8%
(20℃)
49
10-2012
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