Heat Controller A-VMH27TC-1, A-VMH18DC-1, A-VMH36QC-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

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

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

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

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)

Service Manual VMH SerieS Heat Controller, Inc.

4. Wiring Diagram

4.1 A-VMH18DC-1

4.2 A-VMH27TC-1

Heat Controller, Inc. VMH SerieS Service Manual

4.3 A-VMH36QC-1

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

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

Service Manual VMH SerieS Heat Controller, Inc.

Combinations

Unit A

Unit B

—

12k

—

18k

—

12k

Combinations

Unit A

Unit B

Unit C

9k — —

12k — —

18k — —

—

12k

—

18k

—

12k

12k — TRI (1x3)

Combinations

Unit A

Unit B

Unit C

Unit D

9k — —

—

12k — —

—

18k — —

—

9k — —

12k — —

18k — —

12k

12k — —

12k

18k — —

18k

18k — —

—

12k — 9k

18k

—

12k

—

12k

—

QUA(1x4)

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)

Heat Controller, Inc. VMH SerieS Service Manual

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

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

2XWGRRUXQLW

2LOWUDS

,QGRRUXQLW

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

Service Manual VMH SerieS Heat Controller, Inc.

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

(Indoor unit)

-0.1MPa

Handle Lo

Charge hose

(Liquid side)

(Gas side)

Manifold valve

Charge hose

(Outdoor unit)

Two-way valve

Three-way valve

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

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.

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.

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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