INVENTOR U4MRS-12 User manual

• SERVICE MANUAL
ENGLISH
AIR CONDITIONING SYSTEMS
LCAC

Contents
Contents i
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
※The specifications, designs, and information in this book are subject to change without notice for
product improvement.
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

General Information
General Information 1
Part 1
General Information
1. Model Lists...........................................................................................2
2. External Appearance...........................................................................4
2.1 Indoor Units............................................................................................................... 4
2.2 Outdoor Units............................................................................................................ 5

Model Lists
General Information 2
1. Model Lists
1.1 Indoor Units
R410A (capacity multiplied by 1000Btu/h)
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
●
●
Floor-standing
Cooling and heating
●
●
●
●
Floor-standing
Cooling and heating
●
1.2 Outdoor Units
Universal Outdoor unit Model Compressor type Compressor Brand Matched indoor units
Rotary GMCC V4MDI-12
U4MRS-12B Rotary GMCC
Rotary GMCC
Rotary GMCC
V4MDI-12B
V4MCRI-18
V4MDI-18UR
V4MCI-24UR
V4MKI-24UR
V4MDI-24UR
Rotary GMCC
V4MCI-36UR
V4MKI-36UR
V4MDI-36UR
U4MRS-24
U4MRS-18
U4MRS-36
Rotary GMCC V4MCI-42
V4MDI-42
U4MRT-42
Rotary GMCC V4MCI-50UR
V4MDI-50
U4MRT-50
Rotary GMCC V4MCI-60UR
V4MDI-60
U4MRT-60
Rotary GMCC V4MFI-50
V4MFO-50
Rotary GMCC V4MFI-66B
V4MFO-66B

Model Lists
General Information 3

External Appearance
General Information 4
2. External Appearance
2.1 Indoor Units
Super slim cassette Duct
Ceiling-Floor Compact Four-way cassette
Console Floor-standing
Floor-standing

External Appearance
General Information 5
2.2 Outdoor Units
Single fan outdoor unit
Double fan outdoor unit

Indoor Units
Indoor Units 7
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

Super Slim Cassette Type
Indoor Units 8
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

Features
Indoor Units 9
1. Features
1.1Overview
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.
1.3Optional 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.
Ionizer generator
connector
Ventilation motor
connector

Features
Indoor Units 10
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.
1.6Terminals 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.
Draining Pump

Features
Indoor Units 11
1.7Twins 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.
Alarm lamp
Long-distance on-off controller

Dimensions
Indoor Units 12
2. Dimensions
840
840
950
950
C
Test mouth & Test cover
Drain hole
32
Wiring connection port
680
780
780
680
136
126
91
196
132
A
A
B
AA
B
A
A
B
A
B
Service hole for
draining pump
Fresh air intake
75
55
80
80
4-install hanger
Gas side
Liquid side
E-parts box
135
90
Panel
Body
92929292
DD
92 92
D
D
DD
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

Service Space
Indoor Units 13
3. Service Space
>1000mm
>1000mm
>1000mm
>1000mm
Chart 3
A
Drain side Tubing side
(Unit: mm)
680(Hook-location)
780(Hook-location)
840(Body)
840(Body)
880(Ceiling hole)
880(Ceiling hole)
95 0(Panel)
95 0(Pane l)
Necessary room
>2500mm
out let intle t outlet
ground
Chart 1
Chart 4
A
No te:
Nut
Body
Ceiling 880mm
Hook
B
Panel
Chart 2
Body
Chart 5
Central hole
Bolt M6X12 Inst allation paperboard
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
360 00- 48000Btu /h(R 22) Series B= 310mm

Wiring Diagrams
Indoor Units 14
4. Wiring Diagrams

Air Velocity Distributions (Reference Data)
Indoor Units 15
5. Air Velocity Distributions (Reference Data)
18-24K:
Cooling:
Heating:

Air Velocity Distributions (Reference Data)
Indoor Units 16
30-42K:
Cooling:
Heating:

Air Velocity Distributions (Reference Data)
Indoor Units 17
48-55K：
Cooling:
Heating:

Electric Characteristics
Indoor Units 18
6. Electric Characteristics
Model
Indoor Unit
Power Supply
Hz Voltage Min Max MFA
50 220-240V 198V 254V /
50
220-240V
198V
254V
/
50 220-240 198V 254V /
50 220-240V 198V 254V /
50 220-240V 198V 254V /
Notes:
MFA: Max. Fuse Amps. (A)
V4MCI-24UR
V4MCI-36UR
V4MCI-42
V4MCI-50UR
V4MCI-60UR