INVENTOR V4MDI-12, U4MRS-12B, V4MCRI-18, V4MDI-18UR, V4MDI-12B Service Manual

AIR CONDITIONING SYSTEMS

• SERVICE MANUAL

LCAC

ENGLISH

Contents

Part 1 General Information .................................................................................................... 1

Part 2 Indoor Units ................................................................................................................. 7

Part 3 Outdoor Units .......................................................................................................... 119

Part 4 Installation ............................................................................................................... 132

Part 5 Electrical Control System ....................................................................................... 171

MODELS:

U4MRS-12/V4MDI-12, U4MRS-12B/V4MDI-12B,
U4MRS-18/V4MCRI-18, U4MRS-18/V4MDI-18UR,
U4MRS-24/V4MCI-24UR, U4MRS-24/V4MKI-24UR,
U4MRS-24/V4MDI-24UR, U4MRS-36/V4MCI-36UR,
U4MRS-36/V4MKI-36UR, U4MRS-36/V4MDI-36UR,
U4MRT-42/V4MCI-42, U4MRT-42/V4MDI-42,
U4MRT-50/V4MCI-50UR, U4MRT-50/V4MDI-50,
U4MRT-60/V4MCI-60UR, U4MRT-60/V4MDI-60,
V4MFO-50/V4MFI-50, V4MFO-66B/V4MFI-66B

The specifications, designs, and information in this book are subject to change without notice for

※

product improvement.

Contents i

General Information

Part 1

General Information

1. Model Lists ........................................................................................... 2

2. External Appearance ........................................................................... 4

2.1 Indoor Units ............................................................................................................... 4

2.2 Outdoor Units ............................................................................................................ 5

General Information 1

1. Model Lists

Type

Function

12

16

18

24

30

36

42

48

55

Super slim cassette

Cooling and heating

●

● ● ● ● ● ● A5 Duct

Cooling and heating

● ● ● ● ● ● ●

●

A6 Duct

Cooling and heating

● ● ● ● ● ● ● ● Ceiling-floor

Cooling and heating

●

● ● ● ● ●

●

Four-way

cassette(compact)

Cooling and heating

●

●

Console

Cooling and heating

●

●

Cooling and heating

● ● ●

●

Cooling and heating

●

1.1 Indoor Units

R410A (capacity multiplied by 1000Btu/h)

Floor-standing

Floor-standing

1.2 Outdoor Units

Universal Outdoor unit Model Compressor type Compressor Brand Matched indoor units

Model Lists

Rotary GMCC

U4MRS-12B Rotary GMCC

U4MRS-18

U4MRS-24

U4MRS-36

U4MRT-42

U4MRT-50

U4MRT-60

V4MFO-50

Rotary GMCC

Rotary GMCC

Rotary GMCC

Rotary GMCC

Rotary GMCC

Rotary GMCC

Rotary GMCC

V4MDI-12

V4MDI-12B

V4MCRI-18
V4MDI-18UR

V4MCI-24UR
V4MKI-24UR
V4MDI-24UR

V4MCI-36UR
V4MKI-36UR
V4MDI-36UR

V4MCI-42
V4MDI-42

V4MCI-50UR
V4MDI-50

V4MCI-60UR
V4MDI-60

V4MFI-50

General Information 2

V4MFO-66B

Rotary GMCC

V4MFI-6

6B

Model Lists

General Information 3

2. External Appearance

2.1 Indoor Units

External Appearance

Super slim cassette

Ceiling-Floor Compact Four-way cassette

Console Floor-standing

Duct

Floor-standing

General Information 4

2.2 Outdoor Units

Single fan outdoor unit

Double fan outdoor unit

External Appearance

General Information 5

Indoor Units

Part 2

Indoor Units

Super Slim Cassette Type ................................................... 8

A5 Duct Type ...................................................................... 23

A6 Duct Type ...................................................................... 39

Ceiling & Floor Type .......................................................... 57

Four-way Cassette Type (Compact) ................................. 73

Console Type ..................................................................... 83

Floor-standing Type .......................................................... 96

Floor-standing Type ....................................................... 108

Indoor Units 7

Super Slim Cassette Type

Super Slim Cassette Type

1. Features ........................................................................... 9

2. Dimensions .................................................................... 12

3. Service Space ................................................................ 13

4. Wiring Diagrams ............................................................ 14

5. Air Velocity Distributions (Reference Data) ................. 15

6. Electric Characteristics ................................................. 18

7. Sound Levels ................................................................. 19

8. Accessories .................................................................... 20

9. The Specification of Power ........................................... 21

10. Field Wiring .................................................................. 22

Indoor Units 8

Features

Ionizer generator

connector

Ventilation motor

connector

1. Features

1.1 Overview

 Compact design, super slim body size, less space requiring in installation
 Each louver can be separately controlled, more comfort air blowing is possible.
 Auto-lifting panel design, more convenient to clean and maintain the filter. (optional)

1.2 Fresh air intake function

 Fresh air fulfills air quality more healthy and comfortable.
 Ventilation motor is optional to increase the effect of fresh air.

1.3 Optional ionizer generator

 Ionizer generator is optional to get refreshing air to your room.

 Ionizer can be switched on or off by remote controller.

When pressing the Clean Air button on the remote controller, Ionizer will work and the indicator light on
display board will shine.

1.4 External air duct design

 Reserve external air duct, more flexible for the air supply.

Indoor Units 9

Features

Draining Pump

1.5 Built-in draining pump

 Due to the improvement of structure, more convenient to repair or replace the draining pump.

 Built-in draining pump to make sure condensed water drain out reliably.

1.6 Terminals for alarm lamp and long-distance on-off controller connection are
standard

 Reserve terminals for the connection of alarm lamp and long-distance on-off controller, more human

control.

Indoor Units 10

Features

Alarm lamp

Long-distance on-off controller

1.7 Twins Combination(18k-30k)

 The units can be installed as Twin systems: one outdoor unit can connect with two indoor units. The

indoor units can be combined in any of the different available ratings.

Indoor Units 11

Dimensions

840

840

950

950

C

Test mouth &

Test cover

Drain h ole

32

Wiring connection port

680

780

780

680

136
126

91

196

132

A

A

B

A

A

B

A

A

B

A

B

Service hole for

draining pum p

Fresh air intak e

75

55

80

80

4-install hanger

Gas side

Liqu id side

E-parts box

135

90

Pan el

Body

92929292

D

D

92 92

D

D

D

D

92
9292

92

92 92

92

92

D

D

Unit: mm

Model(kBtu/h)

A B C

D

18

160

75

205

50

24~42

160

95

245

60

48~60

160

95

287

60

2. Dimensions

Indoor Units 12

>1000m m

>1000mm

>1000mm

>1000mm

780(Hook-location)

880(Ceiling hole)

>2500mm

out let intle t outlet

ground

Chart 1

No te:

880mm

Hook

B

Panel

Chart 2

Body

Bolt M6X12

180 00-24000Btu/h(R 22) Series A 26 0mm

36000-48000Btu/h(R 22) Series A 330mm

≥
≥

No te:

180 00- 24000B tu/h (R 22) Seri es B= 240mm

3 60 00- 48000B tu /h(R22) Serie s B= 310mm

Service Space

3. Service Space

Indoor Units 13

Wiring Diagrams

4. Wiring Diagrams

Indoor Units 14

Air Velocity Distributions (Reference Data)

5. Air Velocity Distributions (Reference Data)

18-24K:
Cooling:

Heating:

Indoor Units 15

Air Velocity Distributions (Reference Data)

30-42K:
Cooling:

Heating:

Indoor Units 16

Air Velocity Distributions (Reference Data)

48-55K：
Cooling:

Heating:

Indoor Units 17

6. Electric Characteristics

Indoor Unit

Power Supply

50

220-240V

198V

254V

/

Electric Characteristics

Model

V4MCI-24UR

V4MCI-36UR

V4MCI-42

V4MCI-50UR

V4MCI-60UR

Notes:
MFA: Max. Fuse Amps. (A)

Hz Voltage Min Max MFA

50 220-240V 198V 254V /

50 220-240 198V 254V /

50 220-240V 198V 254V /

50 220-240V 198V 254V /

Indoor Units 18

7. Sound Levels

V4MCI-24UR

V4MCI-36UR

Sound Levels

1.4m

M icr op ho ne

Model Noise Power dB(A)

V4MCI-42

V4MCI-50UR
V4MCI-60UR

Noise level dB(A)

H M L

62 46 42 39

65 56 52 48

64 52 40 47

65 55 51 48

69 52 49 46

Indoor Units 19

8. Accessories

Name

Shape

Quantity

Installation Fittings

Installation paper board

1

Tubing & Fittings

Soundproof / insulation sheath

1

Drainpipe Fittings

Out-let pipe sheath

1

Out-let pipe clasp

1

Drain joint

1

Seal ring

1

Remote controller & Its
Frame(The product you
have might not be
provided the following
accessories)

Remote controller & Its Frame

1

Remote controller holder

1

Mounting screw(ST2.9×10-C-H)

2

Remote controller manual

1

Alkaline dry batteries (AM4)

2

Others

Owner's manual

1

Installation manual

1

Installation accessory
(The product you have
might not be provided the
following accessories

Expansible hook

4

Installation hook

4

Orifice

1

Accessories

Indoor Units 20

9. The Specification of Power

Model(Btu/h)

18000~24000

30000

36000

36000

POWER

Phase

1-phase

1-phase

1-phase

3-phase

Frequency and
Voltage

220-240V, 50Hz

220-240V, 50Hz

220-240V, 50Hz

380-415V, 50Hz

POWER WIRING
(mm2)

3×2.5

3×2.5

3×4.0

5×2.5

CIRCUIT BREAKER/Fuse (A)

30/20

40/30

40/30

30/20

Indoor/Outdoor Connecting Wiring

(Weak Electric Signal) (mm2)

2×0.2

2×0.2

2×0.2

2×0.2

Indoor/Outdoor Connecting Wiring

(Strong Electric Signal) (mm2)

3×1.0

3×1.0

3×1.0

3×1.0

Model(Btu/h)

42000~48000

42000~60000

POWER

Phase

1-phase

3-phase

Frequency and Voltage

220-240V, 50Hz

380-415V, 50Hz

Power Wiring (mm2)

3×4.0

5×2.5

Circuit Breaker/Fuse(A)

40/35

30/25

Indoor/Outdoor Connecting Wiring(Weak Electric Signal) (mm2)

2×0.2

2×0.2

Indoor/Outdoor Connecting Wiring(Strong Electric Signal) (mm2)

3×1.0

3×1.0

The Specification of Power

Indoor Units 21

10. Field Wiring

Field Wiring

Indoor Units 22

A5 Duct Type

A5 Duct Type

1. Features ......................................................................... 24

2. Dimensions .................................................................... 27

3. Service Space ................................................................ 28

4. Wiring Diagrams ............................................................ 29

5. Static Pressure ............................................................... 31

6. Electric Characteristics ................................................. 34

7. Sound Levels ................................................................. 35

8. Accessories .................................................................... 36

9. The Specification of Power ........................................... 37

10. Field Wiring .................................................................. 38

Indoor Units 23

Features

Air intake from rear (Standard)

Air intake from bottom (Optional)

1. Features

1.1 Easy Installation: Two air inlet styles (Bottom side or Rear side)

 Air inlet from rear is standard for all capacity; air inlet from bottom is optional.
 The size of air inlet frame from rear and bottom is same, it’s very easy to move the cover from bottom to

rear side, or from rear to the bottom, in order to matching the installation condition.

1.2 Fresh air intake function(Optional for 18~60k)

 Install one duct from the reserved fresh-air intake to outdoor.

Continually inhale the fresh air to improve the quality of the indoor air, fulfills air quality more healthy and
comfortable.

1.3 Easy maintenance

 Clean the filter (Optional, standard product without filter)

It is easy to draw out the filter from the indoor unit for cleaning, even the filter is installed in rear side or
bottom side.

 Replace the motor or centrifugal fan

Remove the ventilated panel firstly. Remove a half of blower housing and take out the motor with
centrifugal fan. Directly remove two bolts, and then replace the motor or centrifugal fan easily.

Indoor Units 24

Features

Motor

Blower Housing

Ventilated Panel

Remote on-off ports

Central control ports

1.4 Reserved remote on-off and central control ports

 Reserved remote on-off ports and central control ports, can connect the cable of an on-off controller or a

central controller to realize remote on-off control function or group control function.

1.5 Built-in drain pump (Optional):

 Built-in drain pump can lift the water to 750mm upmost. It’s convenient to install drainage piping under

most space condition.

Indoor Units 25

Features

Displa

750mm upmost

Wired Controller (Standard)

Remote Controller (Optional)

1.6 Built-in display board

 The standard indoor unit can be controlled by wired controller.
 There is a display board with a receiver in the E-box. Move out the display, and fix it in other place, even

in the distance of 2m. The unit will realized remoter control.

 The wired controller and the display board can display the error code or protection code when the chips

detect some failure.

1.7 Twins Combination

 The units can be installed as Twin systems: one outdoor unit can connect with two indoor units. The

indoor units can be combined in any of the different available ratings.

Indoor Units 26

2. Dimensions

A

C

B

D

J

I

K

Air filter ( optional )

air inle t from rear side

air inle t from bottom side

FE

G

H

Electric control box

Air filter ( optional )

L

4-install hanger

Gas side

Liquid side

M

W1

W2

H1

H2

25 Drain connecting pipe

( for p u mp )

Test mouth & Test cover

Fresh air intake

25 Drain pipe

25 Drain pipe

Dimensions

Note: standard product without filter Unit: mm

V4MDI-12

V4MDI-18UR
V4MDI-24UR

V4MDI-36UR
V4MDI-42
V4MDI-50
V4MDI-60

Model

Outline dimension(mm) Air outlet opening size Air return opening size

Size of

install

Size of refrigerant pipe

hanger

A B C D E F G H I J K L M H1 H2 W1 W2

700 210 635 570 65 493 35 119 595 200 80 740 350 120 143 95 150

920 270 635 570 65 713 35 179 815 260 20 960 350 120 143 95 150

1200 300 865 800 80 968 40 204 1094 288 45 1240 500 175 198 155 210

Indoor Units 27

3. Service Space

Ensure enough space required for installation and maintenance.

Service Space

All the indoor units reserve the hole to joint the fresh air pipe. The hole size as following:

Indoor Units 28