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© 2014 MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved.

SCM60-125ZJ-SS

Introduction of new feature

11/Mar/2014

AIR-CONDITIONING & REFRIGERATION DIVISION

Contents

1

1. Specification

2. Piping limitation

3. Installation limitation

4. Refrigeration circuit control pattern

5. Troubleshooting procedure

© 2014 MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved.


1.Specification

© 2014 MITSUBISHI HEAVY INDUSTRIES, LTD. All Rights Reserved. 2

Capacity

Model

Wall Mounted (SRKxxZJX-SS) ● ● ● ● ●

Wall Mounted (SRKxxZK-SS) ●

Wall Mounted (SRKxxZJ-SS) ● ● ●

Duct (SRRxxZJ-SS) ● ● ● ●

4 Way Ceiling (FDTCxxVF) ● ● ● ●

Outdoor SCM60ZJ-SS, SCM80ZJ-SS, SCM100ZJ-SS, SCM125ZJ-SS

7.12.0 2.5 3.5 5.0 6.0

1-1 Table of models


1.Specification


1-2 Outdoor unit

If it’s needed bigger capacity : Micro KX6 series ↓

2 or 3 Indoor

units can be

connectable.

See the Next page



1.Specification

1-3 Number of connectable Indoor units

1-4 The Capacity of Connectable total Indoor units

* In case of SRK71ZK-SS+SRK71ZK-SS, 2 Indoor units can be connectable.

In case of the combination with SRK20/25/35/45/60ZJX-SS and SRK71ZK-SS,

any 3 Indoor units can be connectable.

The total connecting capacity of Indoor units should be between 10.0kW ～16.0kW.

[ Example of connectable Indoor units ]

2 Indoor units

can be

connectable.

SCM60ZJ-SS SCM80ZJ-SS SCM100ZJ-SS SCM125ZJ-SS

Min 2 2 4* 4*

Max 3 4 5 6

SCM60ZJ-SS SCM80ZJ-SS SCM100ZJ-SS SCM125ZJ-SS

kW 11.0 13.5 16.0 19.5



1.Specification

1-3 Indoor unit

Ceiling Concealed type

SRR

4way Ceiling Cassette

type FDTC

Wall Mounted type

ZJX, ZK, ZJ

SRK

3 type

5 models


2.Piping limitation


SCM60ZJ-SS

SCM100ZJ-SS, SCM125ZJ-SS

SCM80ZJ-SS

FDC112KXEN6, FDC140KXEN6, FDC155KXEN6

Additional

charge

amount of

20g / m


3.Installation limitation


3-1 Beware of wrong connections in refrigerant piping and wiring

1.5mm2×4cores

Including earth cable

Circuit breaker

25A(60/80)

30A(100/125) 1.5mm2×3cores

Including earth cable



3-2 Drain pipe

Bad example without drain up





3-3 Insulation of pipe

<Cooling operation>

< Insulation of pipe >

Very important

From part of evaporator

・There is a cooling EEV in

the outdoor SCM unit

・Insulation of piping is more

important than KX6 unit.

Evaporation

< Refrigerant >

SCM : Mixing liquid and gas

KX6 : Liquid

KX6

position

SCM

position


4.Refrigeration circuit control pattern


4-1 Control of capacity

Temp. of return air

Thi-A

Thi-R3

He

at

ex

ch

an

ge

r Co

mp

.

By calculating the deviation

between the set temperature

and the room temperature of

each room, then the

compressor rotation

frequency is adjusted.

Room(a) Request Hz :

RaHz = Thi-A ―Thi-R1

Compressor Hz :

RaHz + RbHz + RcHz

Room(a) Room(c)

Room(b)

Thi-R1

Thi-R2

【KX6】High

pressure

sensor 【KX6】Low

pressure

sensor

【KX6 unit】

Control of pressure

Cooling : Target of Low pressure

Heating : Target of High pressure




4-2 Super Heat Control

Temp. of return air

Thi-A

Thi-R3

He

at

ex

ch

an

ge

r

Control of Super Heat

By EEV

Cooling

SH = Tho-S －Thi-R1(*1)

(*1)Average of operation

indoor units

Heating

SH = Tho-S －Tho-R

Room(a) Room(c)

Room(b)

Thi-R1

Thi-R2

【KX6 unit】

Cooling : Thi-R3-R1 or R2 =3℃

Control of Indoor unit EEV

Heating : Tho-R － CSST

Control of Outdoor unit EEV

Tho-S Tho-R

LP sensor

CSST

Tho-R




4-3 Protective Control

He

at

ex

ch

an

ge

r Co

mp

.

(1)Discharge temperature

Control

Tho-D ≧ 105℃

＞Compressor Hz down

Tho-D ≧ 115℃

＞Compressor stop

(2)High pressure control

SCM100/125ZJ only

HP sensor≧3.85Mpa


HP sensor≧4.05Mpa

＞Compressor stop

Thi-R1

Tho-D

High

pressure

sensor

(3)High pressure control

SCM60/80ZJ only

<Heating>

Thi-R1≧55℃


<Cooling>

Tho-A≧47℃


Tho-A



5-1 Self-diagnosis table SCM60, 80 － ①

5.Troubleshooting procedure



5-1 Self-diagnosis table SCM60, 80 － ②





5-1 Self-diagnosis table SCM100, 125 － ①



5-1 Self-diagnosis table SCM100, 125 － ②





5-2 Troubleshooting without COMT

Wired Remote Controller can provide

more info than Wireless one.

Sometimes, it is easy to understand

error code.

Troubleshooting is very

difficult by Wireless

remote

Controller

RUN

Light

TIMER

Light

RED

LED

Confirm following 2 items

1) 2 display lights of I/D

2) LED lights on PCB in O/D

Refer to Technical data book

to confirm cause of problem.

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