Heat Controller Inc Air Conditioner A VMH27TC 1 User Manual

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

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1. General information of Outdoor Units

Model name

A-VMH18DC-1

A-VMH27TC-1

A-VMH36QC-1

Dimension mm(in)

Compressor

DA130S1C-20FZ

DA150S1C-20FZ

TNB306FPGMC-L

845x320x700(33.3x12.6x27.6)

990x345x965(39x13.6x38)

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2．Features

Outdoor unit

Power relay control

Low noise air flow system

Hydrophilic aluminum fin

The hydrophilic fin is corrosion resistant and improves heating efficiency in heat mode by absorbing the water on

its surface and by spreading the water instead of forming water droplets.

4 way valve control

Operates only in heating mode except during defrosting.

Anti-rust cabinet

Valve protection cover

It protects the valves and prevents water from dripping in the cabinet.

Discharge pipe temperature protection

Compressor crankcase heater

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3. Dimensions

mm(in)

Model

A-VMH18DC-1

A-VMH24TC-1

A-VMH36QC-1

845((33.3)

990(39)

320(12.6)

345(13.6)

700(27.6)

965(38)

908(35.7)

1075(42.3)

560(22)

624(24.6)

335(13.2)

366(14.4)

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4. Wiring Diagram

4.1 A-VMH18DC-1

4.2 A-VMH27TC-1

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4.3 A-VMH36QC-1

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5. Refrigeration Cycle Diagram

8.1 Refrigeration circuit drawing of inverter dual zone: A-VMH18DC-1

INDOOR

OUTDOOR

EXV A CAPILIARY A

EXV B CAPILIARY B

LIQUID VALVE

CHECK VALVE

Condenser

temp. sensor

CAPILIARY TUBE

HEAT

EXCHANGE

(EVAPORATOR)

HEAT

EXCHANGE

(CONDENSER)

T4 Ambient

temp. sensor

T1 Room

temp. sensor

T2 Evaporator

temp. sensor

GAS VALVE A

GAS VALVE B

4-WAY VALVE

Accumulator

T5 Discharge

temp. sensor

COOLING

HEATING

Compressor

5.2 Refrigeration circuit drawing of inverter tri-zone: A-VMH27TC-1

INDOOR

OUTDOOR

EXV A CAPILIARY A

LIQUID VALVE

EXV B CAPILIARY B

EXV C CAPILIARY C

CHECK VALVE

LIQUID VALVE

Condenser

temp. sensor

CAPILIARY TUBE

HEAT

EXCHANGE

(EVAPORATOR)

HEAT

EXCHANGE

(CONDENSER)

T4 Ambient

temp. sensor

T1 Room

temp. sensor

GAS VALVE A

GAS VALVE B

GAS VALVE C

T2 Evaporator

temp. sensor

4-WAY VALVE

Accumulator

T5 Discharge

temp. sensor

COOLING

HEATING

Compressor

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8.3 Refrigeration circuit drawing of inverter Quad-zone: A-VMH36QC-1

INDOOR

OUTDOOR

EXV A CAPILIARY A

EXV B CAPILIARY B

LIQUID VALVE A

LIQUID VALVE B

CHECK VALVE

EXV C CAPILIARY C

EXV D CAPILIARY D

LIQUID VALVE C

LIQUID VALVE D

Condenser

temp. sensor

CAPILIARY TUBE

HEAT

EXCHANGE

(EVAPORATOR)

HEAT

EXCHANGE

(CONDENSER)

T4 Ambient

temp. sensor

T1 Room

temp. sensor

GAS VALVE A

GAS VALVE B

T2 Evaporator

temp. sensor

4-WAY VALVE

Accumulator

GAS VALVE C

GAS VALVE D

High pressure

switch

T5 Discharge

temp. sensor

COOLING

HEATING

Low pressure

switch

Compressor

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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

Combinations

Comb.

Unit A Unit B

12k

18k

—

Dual(1x1)

Dual (1x2)

—

12k

6.2Indoor unit combinations A-VMH27TC-1

Combinations

Comb.

Unit A Unit B Unit C

12k

18k

—

TRI (1x1)

—

12k

18k

12k

TRI (1x2)

TRI (1x3)

12k

6.3Indoor unit combinations A-VMH36QC-1

Combinations

Comb.

Unit A Unit B Unit C Unit D

12k

18k

12k

18k

—

QUA (1x1)

QUA (1x2)

—

12k

18k

12k

18k

12k

—

12k

18k

12k

QUA (1x3)

QUA(1x4)

12k

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7. Installation Details

7.1 Wrench torque sheet for installation

Outside diameter

Torque

Additional tightening torque

N^.m

inch

1/4

3/8

1/2

Ф6.35

Ф9.52

Ф12.7

15(153kgf.cm)

16(163kgf.cm)

25(255kgf.cm)

35(357kgf.cm)

26(265kgf.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

Max.

Elevation

B (m)

Max.

Length

A (m)

Additional

refrigerant

(g/m)

Standard

length

Unit

Gas inch

(mm)

Liquid inch

(mm)

(m)

3/8’’ (Ф9.52) 1/4’’ (Ф6.35)

(5)

(10)

(15)

50ft

(20)

16.5ft

33ft

0.2 oz/ft

12K/18K

1/2’’ (Ф12.7) 1/4’’ (Ф6.35)

Dual-zone(m)

Tri-zone(m)

(45)150ft

Quad-zone(m)

Max. Total length for all rooms

(30)100ft

(60)200ft

2XWGRRUꢀXQLW

2LOꢀWUDS

,QGRRUꢀXQLW

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

provided with all 12/18k indoor sections.

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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

(Indoor unit)

(Outdoor unit)

(Liquid side)

Two-way valve

(Gas side)

Three-way valve

Manifold valve

Compound meter

Pressure

gauge

-0.1MPa

Handle Lo

Handle Hi

Charge hose

Vacuum

pump

Vacuum

pump

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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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.

Be sure to use a hexagonal wrench to operate the valve stems.

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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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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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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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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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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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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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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.

Display

Remark

No.SW1

Pressed

Indoor unit capacity demand code

Outdoor unit running mode code

Amendatory capacity demand code

Outdoor unit fan motor state

Off:0, Cooling:1, Heating:2

Off:0, Low speed:1, High speed:2

Evaporator outlet temp. for 1# indoor unit

Evaporator outlet temp. for 2# indoor unit

Evaporator outlet temp. for 3# indoor unit

Evaporator outlet temp. for 4# indoor unit

Condenser pipe 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: “- -“.

Ambient temp.

Compressor discharge temp.

Actual data is measured, however due to display limitations

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

the digital display shows “0.5”, it means the compressor

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discharge temp. is 105 degree. If the indoor unit is not

connected, the digital display tube will show: “- - “.

Inverter current

AD data

EXV open angle for 1# indoor unit

Actual data, divide this number by 8 for actual angle valve is

open.

EXV open angle for 2# indoor unit

EXV open angle for 3# indoor unit

EXV open angle for 4# indoor unit

Actual data divide 8

Power supply of outdoor unit

Indoor unit number

AD data (AD data*472/255=actual data)

The indoor unit can communicate with outdoor unit well.

00 means no malfunction

The last error or protection code

frequency value

Actual data

Check point over

Ambient temp. of 1# indoor unit

Condenser pipe temp. of 1# indoor unit

Ambient temp. of 2# indoor unit

Condenser pipe temp. of 2# indoor unit

Ambient temp. of 3# indoor unit

Condenser pipe temp. of 3# indoor unit

Ambient temp. of 4# indoor unit

Condenser pipe temp. of 4# indoor unit

――

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)

Stand by

8.4.2 Running mode:

Display

Corresponding mode

Off

Cooling mode

Heating mode

8.4.3 Capacity demand:

Cooling mode

Capacity

2000-

2500

2000-

2500

3000-

4500-

5000

5000-

5500

6100-

7000

7000-

7500

7500-

8000

>7500

>=10

3800

-6100

Corresponding

Code

Heating mode

Capacity

2000-25 2000-25 3000-38 4500-50 5500-61 6100-70 6100-70 7000-75 7500-80 >8000

Corresponding

Code

9-10

>=11

Note:

The capacity is just for reference.

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8.4.4Number of indoor units – displays how many indoor units the outdoor unit is communicating with.

Display

Quantity of indoor unit

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

No limit

VOLLIMT1

VOLFRE1

VOLREL2

VOLLIMT2

VOLFRE2

VOLREL3

VOLLIMT3

Off

Model

VOLLIMT1

230

VOLLIMT2

200

VOLLIMT3

120

VOLREL1

260

VOLREL2

210

VOLREL3

135

VOLFRE1 VOLFRE2

A-VMH18DC-1

A-VMH27TC-1

A-VMH36QC-1

245

220

120

265

240

135

200

185

120

210

195

135

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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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)

COOL_F10

COOL_F9

Current limit value(A)

ICOOLLMT6

ICOOLLMT5

ICOOLLMT4

ICOOLLMT3

ICOOLLMT2

ICOOLLMT1

Frequency limit

The compressor frequency will decrease to COOL_F4 and

then run at COOL_F4 for 3 minutes.

COOL_F8

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).

COOL_F7

COOL_F6

COOL_F5

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.

Heating mode:

Current frequency(Hz)

HEAT_F12

HEAT_F11

HEAT_F10

HEAT_F9

Current limit value(A)

IHEATLMT8

IHEATLMT7

IHEATLMT6

IHEATLMT5

IHEATLMT4

IHEATLMT3

IHEATLMT2

IHEATLMT1

Frequency limit

The compressor frequency will decrease HEAT_F4 and

then run at HEAT_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).

HEAT_F8

HEAT_F7

HEAT_F6

HEAT_F5

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.

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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.

Model

RECOILINFRE

A-VMH18DC-1

A-VMH27TC-1

A-VMH36QC-1

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.

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Service Manual

9. Troubleshooting

9.1 Indoor Mini-Split error code explanations:

Indoor Error

LED STATUS

Code

Corresponding

Outdoor Error code

Indoor EEPROM malfunction

——

Indoor/ outdoor unit communication error

Zero-crossing signal error

——

Indoor fan speed has been out of control

E0,E1,E2,

E3,E4,E6

Open circuit or short circuit of outdoor temperature sensor or outdoor

EEPROM malfunction

Open circuit or short circuit of T1 or T2 temperature sensor

IPM module protection or IGBT over-strong current protection

Voltage protection

——

Temperature protection of compressor top

Outdoor temp. too low protection(Optional for some models)

Inverter compressor drive protection

P0,P1,P2

——

E7, P7

——

Mode conflict

Indoor Ceiling Cassette error codes:

Operation

Timer

De-frost

Alarm

LED STATUS

Open or short circuit of T1 temperature sensor

Open or short circuit of T2 temperature sensor

Indoor / outdoor units communication error

Full-water malfunction

★

Indoor EEPROM malfunction

★



IPM module protection



Open or short circuit of T3 or T4 temperature sensor

Voltage protection



Temperature protection of compressor top.

Mode conflict

★



★



Inverter compressor drive protection

★ flash at 2.5Hz,  light, X extinguished.

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9.2Outdoor unit error code explanation:

Outdoor

Corresponding Indoor

Error

LED STATUS

Mini-Split error code

Code:

Outdoor EEPROM malfunction

Indoor unit A’s coil outlet temp. sensor or connector of

sensor is defective

Indoor unit B’s coil outlet temp. sensor or connector of

sensor is defective

Indoor unit C’s coil outlet temp. sensor or connector of

sensor is defective

Indoor unit D’s coil outlet temp. sensor or connector of

sensor is defective

Open or short circuit of outdoor unit temperature sensor

Voltage protection

Communication malfunction between IPM board and

outdoor main board

Temperature protection of compressor discharge or

compressor top.

For A-VMH-36QC-1 it means Temperature protection of

compressor discharge

High pressure protection (Only for A-VMH-36QC-1)

Low pressure protection (Only for A-VMH-36QC-1)

Current protection of compressor

——

IPM module protection

High temperature protection of condenser

——

Inverter compressor drive protection

PFC module protection (A-VMH36QC-1)

——

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9.3Trouble 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

Insert the EEPROM well

Re-insert the EEPROM well

directly. Otherwise,

check whether the

EEPROM chip

plugged in PCB well?

Yes

Replace the indoor PCB.

EEPROM: a read-only memory chip whose contents can be erased and reprogrammed using a pulsed

voltage.

(EERROM chip may be solid for some models)

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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?

Yes

Check wiring on the outdoor

and indoor terminal follow the

wiring diagram. Are all wires

connected correctly?

Reconnect the wiring

Yes

Measure Vs, is it moving

alternately between positive

value and negative value?

(Vs is the voltage between

S and L2)

Refer PIC 1

Turn on all indoor units with

the remote controller. Are

no.

outdoor

units

correct? Refer to PIC 5.

Yes

A: Is all the wiring

between terminal

and Indoor PCB

connected ok?

Turn off the all indoor

units. Is IPM power LED

lamp On? Refer PIC 3

change

IPM

Yes

Change

the

change

PFC

Is PFC power LED lamp

off? Refer PIC 3.

Indoor PCB

Yes

Power on by remote

controller, has the E1

error

after 3 minutes?

code

ended

Reconnect the wiring

Is Main board

Yes

the

reactor

“

lamp on?

connecting well？

Refer PIC 4

Yes

Change Outdoor Main

PCB

Are number of indoor units

correct? Check on the

outdoor check point (18). (2

for dual zone, 3 for tri zone, 4

for qua zone). Refer PIC 5.

Yes

E1 error problem solved.

No, second time

No, fist time

SEE A

Change

outdoor

unit

PCB

assembly(include wiring) totally

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Pic 1: Measure the voltage of L2 to S (Vs), is it

moving alternately between positive value and

negative value?

PIC 2, Check the wiring.

PIC 3: IPM (For dual/tri/quad-zone)

PFC (quad-zone only)

PIC4: Main board LED when power on and unit standby.

PIC 5: check point bottom,

press 18 times to check how many indoor units are

connected.

Service Manual

9.3.1.3 Zero-crossing signal error

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Correct the connections. Turn on the unit

Check if the connections and

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.

power supply i rmor l?al?

Yes

Indoor PCB is defective.

Replace indoor PCB.

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?

The unit operates normally.

Yes

Shut off the power supply,

Shut off the power supply, rotate the fan

Replace indoor fan

motor.

rotate the fan by hand. Does

by hand. Does it rotate freely with any

rubbing/obstructions?

it rotate properly?

Yes

Check the wires of fan motor.

Are all the connections good?

Correct the connections.

Correct the connections

per wiring diagram.

Yes

Check the voltage between port

1 and 6 of fan motor connector,

is it 310V?

Yes

Replace indoor main PCB. Is it

still displaying the error code?

The unit operates normally.

DC motor voltage input and output

NO.

Color

Red

Signal

VDC

---

Voltage

310V

---

White

Blue

Yellow

Black

Vcc

15V

0.3V

0-7.5V

Vsp

GND

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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?

The unit operates normally.

Yes

S h u t o f f t h e p o w e r

supply, rotate the cross

fan by hand. Does it

Disassembly the

connection between

fan and motor, check if

the bearing is normal?

Replace the bearing.

rotate properly?

freely?

Yes

Check the wires of

fan motor. Are all the

connections good?

Correct the connections

Correct the connections.

Replace indoor fan motor.

per wiring diagram.

Yes

Check the resistance value of

indoor fan motor, is it normal?

Yes

Replace indoor PCB.

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9.3.1.6 Open or short circuit of temperature sensor.

Check the connections

between temperature

sensor and PCB. Are

the connections good?

Correct the connections.

wiring diagram.

Correct the connections per

Yes

Check the resistance value

of the sensor via Appendix

1, is it normal?

Replace indoor or outdoor PCB.

Yes

Replace the sensor and

Replace the sensor

c h e c k i f t h e p r o b l e m

happen again?

9.3.1.7 Full-water malfunction (For Ceiling Cassette)

If the water-level switch

Yes

Insert the water-level switch well

Re-insert the water-level switch well

Replace the water-level switch

Replace the water pump

is inserted well?

Yes

IsIf the water-level switch

is broken?

If the water pump is

normal?

Yes

Check PCB board or replace the indoor main PCB

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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.

Turn on the unit when outdoor

ambient temperature is in normal

operation temperature range.

Yes

Replace the outdoor ambient

temperature sensor.

9.3.2 Outdoor unit trouble shooting

9.3.2 1 Outdoor EEPROM malfunction (ODU E0)

Outdoor EEPROM malfunction

If the EEPROM chip is welded on

PCB, replace the PCB directly.

Otherwise, check whether the

EEPROM chip plugged in PCB

well?

Re-insert the EEPROM well

Insert the EEPROM well

Yes

Replace the outdoor main board

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9.3.2.2 Voltage protection (ODU E5)

Voltage protection

Check the voltage of

outdoor unit power supply,

whether the voltage

Check the power supply

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

Replace bridge rectifiers,

and then check whether the

system can run normally

Yes

Replace IPM board, and

then check whether the

system can run normally

Yes

Replace outdoor main board

Trouble is solved

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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 lliigt?ht?

Check the signal wire between

the IPM module and the main

board, is it connected good?

Yes

Reconnect and retry. Is

displaying?

error still display?

Replace IPM board, and

then check whether the

system can run normally

Yes

Replace outdoor main

board, and then check

whether the system can run

normally

Replace the electric control

box

Trouble is solved

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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)?

Check whether there is

Yes

Stop leak and add refrigerant as needed

a refrigerant leak

Check whether the wiring

connection is correct between

compressor discharge temp.

sensor and PCB according to

wiring diagram?

Correct the wiring connection

Yes

The discharge temp.

sensor may be

broken.

Check whether the

resistance of compressor

discharge temp. sensor is

right refer to the Appendix 2

Replace the compressor discharge temp. sensor

Yes

Replace outdoor main board

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9.3.2.5 Temperature protection of compressor top (ODU P0)

Temperature protection of

compressor top

Are all

connections correct?

Does the compressor

operate?

Reconnect and retest.

Yes

Is the unit properly

charged?

Check whether protector is

normal? If protector is normal,

resistance=0

Replace the protector.

Properly charge the system

Yes

Replace the outdoor main PCB

Is there any abnormality of

operation after the system

was charged?

Check refrigerant circuit,

such as clogging of

capillary tubes etc.

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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?

Reconnect it properly

Yes

Is the high pressure

protector broken?

Yes

Short circuit the high

pressure protector socket,

check whether the system

can run normally now?

Yes

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)?

Yes

Stop the unit

Check whether the outdoor

unit’s airﬂow is obstructed

Remove all obstructions for proper ventilation

Check whether the heat

exchanger is dirty

Clean the heat exchanger

Evacuate the refrigerant, then use

high pressure nitrogen or refrigerant

to blow pipe, vacuum and recharge

with refrigerant again

Check whether the

refrigerant circuit has a

blockage

Replace outdoor main board

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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?

Reconnect it properly

Yes

Is the low pressure

protector broken?

Yes

Short circuit the low

pressure protector socket,

check whether the system

can run normally now?

Yes

Replace low pressure protector

Check whether

the refrigerant

system is ok

Check whether the

outdoor ambient

Yes

Stop the unit

temperature is to low

Check if there is

a refrigerant leak

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 ﬁnd the leak and repair.

Connect the pressure gauge to

the gauge joint of the system,

check whether the pressure is

lower than 0.14MPa

Yes

Evacuate the refrigerant, then use

high pressure nitrogen or refrigerant

to blow out pipe, vacuum and

Check whether the

refrigerant circuit is

blocked or not

recharge with refrigerant again

Replace outdoor main board

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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)?

Yes

Stop the unit

Check whether the outdoor

unit’s airﬂow is obstructed

Yes

Remove all obstructions for proper ventilation

Check whether the heat

exchanger is dirty

Clean the heat exchanger

Evacuate the refrigerant, then use

high pressure nitrogen or refrigerant

to blow pipe, vacuum and recharge

with refrigerant again

Is the refrigerant

circuit blocked?

Replace outdoor main

board, and check

whether the system can

run normally

Replace the electrical

control box

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9.3.2.9 IPM module compressor (ODU P4)

IPM module protection

Regulate it to

Check whether the voltage range

of P-N on IPM module is normal?

DC277-356V for 18-27KBtu/h;

DC277-410V for 36KBtu/h

Check whether the

input power supply is

correct? 220-240V,

1PH 60Hz

correct, then check

whether the system

can work normally?

Yes

Check whether the

connecting line between main

board and the IPM module is

connected tightly

Connect it tightly,

check ok or not?

Check whether the

power supply line is

connected correctly

and tightly

Connect it correctly

and tightly, check ok

or not?

Yes

Check whether the

connecting line of the

compressor is connected

correctly or tightly

Connect it well

check ok or not?

Check whether

the wires in E-part

box are connected

tightly

Connect it tightly,

check ok or not?

Yes

Replace the IPM module,

check whether the system

can work normally?

Check whether the bridge rectiﬁers

are normal? Use the multimeter to

measure the resistance between

each two terminals, check whether

the value of resistance is 0

Yes

Replace the main board;

check whether the system

can work normally?

Replace the bridge rectiﬁers

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

Replace the compressor.

Replace the connecting

line or reactor or replace

the PFC module for a

A-VMH36QC-1

Yes

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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)

Check whether the

resistance of condenser

temp. sensor is correct

refer to the Appendix 1

Yes

Replace outdoor main board

Yes

Check whether the

outdoor ambient temperature is

higher than 122°F (50°C)

Yes

Stop the unit

Check whether the

heat exchanger is dirty

Yes

Clean the heat exchanger

Evacuate the refrigerant, then use the

high pressure nitrogen or refrigerant to

blow out the pipes, vacuum and recharge

the refrigerant again

The refrigerant

circuit is blocked

Yes

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9.3.2.11 High PFC module protection (ODU P6) (Only for A-VMH36QC-1)

PFC module protecton

Check whether the connecting line

Connect it tightly,

between main board and the PFC

module is connected tightly

check normal or not

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

Yes

Replace the outdoor main board

Check whether the inductance

of PFC module is good? If the

inductance is good, the resistance of

the two ports is 0

Replace the inductance

Yes

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.

Service Manual

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Appendix 1 Temperature Sensor Resistance Value Table (℃--K) Use appendix 4 to convert °C to °F.

K Ohm

115.266

108.146

101.517

96.3423

89.5865

84.2190

79.3110

74.5360

70.1698

66.0898

62.2756

58.7079

56.3694

52.2438

49.3161

46.5725

44.0000

41.5878

39.8239

37.1988

35.2024

33.3269

31.5635

29.9058

28.3459

26.8778

25.4954

24.1932

22.5662

21.8094

20.7184

19.6891

18.7177

17.8005

16.9341

16.1156

15.3418

14.6181

13.9180

13.2631

K Ohm

12.6431

12.0561

11.5000

10.9731

10.4736

10.000

K Ohm

2.35774

2.27249

2.19073

2.11241

2.03732

1.96532

1.89627

1.83003

1.76647

1.70547

1.64691

1.59068

1.53668

1.48481

1.43498

1.38703

1.34105

1.29078

1.25423

1.21330

1.17393

1.13604

1.09958

1.06448

1.03069

0.99815

0.96681

0.93662

0.90753

0.87950

0.85248

0.82643

0.80132

0.77709

0.75373

0.73119

0.70944

0.68844

0.66818

0.64862

K Ohm

0.62973

0.61148

0.59386

0.57683

0.56038

0.54448

0.52912

0.51426

0.49989

0.48600

0.47256

0.45957

0.44699

0.43482

0.42304

0.41164

0.40060

0.38991

0.37956

0.36954

0.35982

0.35042

0.3413

℃

-20

-19

-18

-17

-16

-15

-14

-13

-12

-11

-10

-9

℃

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

9.55074

9.12445

8.71983

8.33566

7.97078

7.62411

7.29464

6.98142

6.68355

6.40021

6.13059

5.87359

5.62961

5.39689

5.17519

4.96392

4.76253

4.57050

4.38736

4.21263

4.04589

3.88673

3.73476

3.58962

3.45097

3.31847

3.19183

3.07075

2.95896

2.84421

2.73823

2.63682

2.53973

2.44677

-8

-7

-6

-5

-4

-3

-2

-1

0.33246

0.32390

0.31559

0.30754

0.29974

0.29216

0.28482

0.27770

0.27078

0.26408

0.25757

0.25125

0.24512

0.23916

0.23338

0.22776

0.22231

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Appendix 2

Unit: °C ---K

Discharge temp. sensor table

-20

-19

-18

-17

-16

-15

-14

-13

-12

-11

-10

-9

542.7

511.9

483

68.66

65.62

62.73

59.98

57.37

54.89

52.53

50.28

48.14

46.11

44.17

42.33

40.57

38.89

37.3

13.59

13.11

12.65

12.21

11.79

11.38

10.99

10.61

10.25

9.902

9.569

9.248

8.94

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

3.702

3.595

3.492

3.392

3.296

3.203

3.113

3.025

2.941

2.86

455.9

430.5

406.7

384.3

363.3

343.6

325.1

307.7

291.3

275.9

261.4

247.8

234.9

222.8

211.4

200.7

190.5

180.9

171.9

163.3

155.2

147.6

140.4

133.5

127.1

121

2.781

2.704

2.63

-8

-7

8.643

8.358

8.084

7.82

2.559

2.489

2.422

2.357

2.294

2.233

2.174

2.117

2.061

2.007

1.955

1.905

1.856

1.808

1.762

1.717

1.674

1.632

-6

-5

35.78

34.32

32.94

31.62

30.36

29.15

-4

-3

7.566

7.321

7.086

6.859

6.641

6.43

-2

-1

26.9

25.86

24.85

23.89

22.89

22.1

6.228

6.033

5.844

5.663

5.488

5.32

21.26

20.46

19.69

18.96

18.26

17.58

16.94

16.32

15.73

15.16

14.62

14.09

115.2

109.8

104.6

99.69

95.05

90.66

86.49

82.54

78.79

75.24

71.86

5.157

4.849

4.703

4.562

4.426

4.294

4.167

4.045

3.927

3.812

B(25/50)=3950K

R(90℃)=5KΩ±3%

Service Manual

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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

U-W

V-W

P-N

60-150V(AC)

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

Infinite

Backward Resistance

Infinite

~1.7M ohm

Infinite

~1.7M ohm

Infinite

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Appendix 4:

Service Manual

Appendix 5:

VMH SerieS

Heat Controller, Inc.

Spec.

Outdoor unit

Model

1x2

1x3

1x4

Compressor

DA130S1C-20FZ

YDK70-6FB

DA150S1C-20FZ

YDK70-6FB

TNB306FPGMC-L

YDK180-8GB

Outdoor fan motor

Indoor unit

12k Mini-Split

RPG20B

Model

9k Mini-Split

18k Mini-Split

RPG28H

Indoor fan motor

Model

RPG20B

12k Cassette

YDK45-6B

18k Cassette

YDK45-6B

Indoor fan motor

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℃)

0.53Ω(20℃)

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

56Ω±8%

(20℃)

24.5Ω±8%

(20℃)

317Ω±8%

(20℃)

145Ω±8%

(20℃)

345Ω±8%

(20℃)

627Ω±8%

(20℃)

Black - Red

Red - Yellow

Yellow - Blue

76Ω±8%

(20℃)

19Ω±8%

(20℃)

252Ω±8%

(20℃)

88Ω±8%

(20℃)

150Ω±8%

(20℃)

374.3Ω±8%

(20℃)

76Ω±8%

(20℃)

19Ω±8%

(20℃)

252Ω±8%

(20℃)

88Ω±8%

(20℃)

150Ω±8%

(20℃)

374.3Ω±8%

(20℃)

Measure the resistance value of each winding by using the tester

Position

Resistance Value

RPG20B RPG28H

Black - Red

381Ω±8% (20℃)

267Ω±8% (20℃)

183.6Ω±8% (20℃)

206Ω±8% (20℃)

White - Black

10-2012

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