Mitsubishi Heavy Industries SRK20ZJ-S User manual

TECHNICAL MANUAL
Manual No.'10•SR-T-091
INVERTER RESIDENTIAL AIR CONDITIONERS
(Split system, air to air heat pump type)
Wall mounted type
SRK20ZJ-S
SRK25ZJ-S
SRK35ZJ-S
50ZJ-S
SRK20ZJX-S
SRK25ZJX-S
SRK35ZJX-S
SRK50ZJX-S
SRK60ZJX-S
Floor standing type
SRF25ZJX-S
SRF35ZJX-S
SRF50ZJX-S
Ceiling concealed type
SRR25ZJ-S
SRR35ZJ-S
Ceiling cassette-4way compact type
FDTC25VD
FDTC35VD

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CONTENTS
1. SPECIFICATIONS ........................................................................................ 5
(2) Outdoor units ....................................................................................... 26
..................................................... 60
(3) Remote controller ................................................................................ 30
(1) Wall mounted type (SRK) ..................................................................... 5
......................................................................... 21
(2) Floor standing type (SRF)
(1) Indoor units .......................................................................................... 21
2. EXTERIOR DIMENSIONS
....................................... 19(4) Ceiling cassette-4way compact type (FDTC)
(3) Ceiling concealed type (SRR) .............................................................. 17
.................................................................... 14
3. ELECTRICAL WIRING .............................................................................. 32
(1) Indoor units .......................................................................................... 32
4. NOISE LEVEL ............................................................................................ 41
(2) Outdoor units ....................................................................................... 37
(1) Wall mounted type (SRK) ..................................................................... 41
(2) Floor standing type (SRF) .................................................................... 50
(4) Ceiling cassette-4way compact type (FDTC) ....................................... 55
....................................... 84
(3) Ceiling concealed type (SRR) .............................................................. 53
7. RANGE OF USAGE & LIMITATIONS
................................................................................... 62
8. CAPACITY TABLES
5. PIPING SYSTEM ...................................................................................... 57
.................................................................................. 68
9. APPLICATION DATA
(1) Wall mounted type (SRK) ..................................................................... 62
(4) Ceiling cassette-4way compact type (FDTC) ....................................... 67
(2) Floor standing type (SRF) .................................................................... 65
(3) Ceiling concealed type (SRR) .............................................................. 66
9.1 Installation of indoor unit ..................................................................... 68
(1) Wall mounted type (SRK) ..................................................................... 68
(3) Ceiling concealed type (SRR) .............................................................. 80
(2) Floor standing type (SRF) .................................................................... 76
(4) Ceiling cassette-4way compact type (FDTC)
9.2 Installation of outdoor unit ................................................................... 90

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10. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ...............111
................................................................130
(6) 3D auto operation .............................................................................114
.......................................................126
(7) Timer operation ..................................................................................115
10.1 Models SRK20㨪50ZJ-S ......................................................................111
.......................................................112
(1) Operation control function by remote controller
(5) Flap and louver control ......................................................................113
(4) Custom cord switching procedure
.........................................................................112(3) Auto restart function
(2) Unit ON/OFF button ...........................................................................112
..................................111
(8) Installation location setting .................................................................115
(9) Outline of heating operation ................................................................116
(11) Outline of automatic operation ...........................................................117
(10) Outline of cooling operation ...............................................................117
(12) Protective control function ...................................................................118
10.2 Models SRK20㨪60ZJX-S ......................................................................125
(2) Unit ON/OFF button ............................................................................126
(1) Operation control function by remote controller ...................................125
(4) Custom cord switching procedure
(3) Auto restart function ...........................................................................126
(9) Outline of heating operation
(5) Flap and louver control .....................................................................127
(8) Installation location setting ..................................................................129
(6) 3D auto operation ..............................................................................128
(7) Timer operation ....................................................................................129
.......................................................139
(2) Unit ON/OFF button .............................................................................139
(4) Custom cord switching procedure
(3) Auto restart function ............................................................................139
(5) Flap control ........................................................................................140
(8) Outline of heating operation .................................................................141
(6) Air outlet selection ...............................................................................140
(7) Timer operation .....................................................................................141
(10) Outline of cooling operation .............................................................131
(11) Outline of automatic operation ............................................................131
10.3 Models SRF25㨪50ZJX-S .....................................................................138
(12) Protective control function ...................................................................132
(1) Operation control function by remote controller .................................138

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(9) Outline of cooling operation .................................................................143
.....................179
(4) Custom cord switching procedure ........................................................151
...............................................................................178
(5) Timer operation ......................................................................................152
(10) Outline of automatic operation ............................................................143
..............................................................................151
(11) Protective control function
(3) Auto restart function ............................................................................151
(2) Unit ON/OFF button
...................................150(1) Operation control function by remote controller
10.4 Models SRR2535ZJ-S .......................................................................150
..................................................................144
(6) Outline of heating operation .................................................................152
(7) Outline of cooling operation ................................................................153
(9) Protective control function ...................................................................154
(8) Outline of automatic operation ...............................................................154
10.5 Models FDTC2535VD ..........................................................................160
(1) Remote controller (option parts) ..........................................................160
(3) Operation control function by the indoor controller ..............................163
(2) Operation control function by the wired remote controller ....................162
(4) Operation control function by the outdoor controller .............................172
(4) Troubleshooting procedure (If the air conditioner runs)
11.1 SRK,SRF and SRR series .....................................................................178
(3) Troubleshooting procedure
(If the air conditioner does not run at all)
........178
(1) Cautions .............................................................................................178
(2) Items to check before troubleshooting .................................................178
..........................................................................................199
(10) How to make sure of wireless remote controller ..................................195
11.2 FDTC series
(11) Outdoor unit inspection points ..............................................................196
11.2.1 Diagnosing of microcomputer circuit ...........................................199
(3) Troubleshooting at the indoor unit .....................................................202
(1) Selfdiagnosis function ..........................................................................199
(2) Troubleshooting procedure .................................................................202
(5) Self-diagnosis table .............................................................................180
(6) Service mode (Trouble mode access function) ...................................181
(8)
Phenomenon observed after shortcircuit, wire breakage on sensor .........193
(7) Inspection procedures corresponding to detail of trouble ....................189
(9) Checking the indoor electrical equipment ...........................................194
11. MAINTENANCE DATA

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(4) Check of anomalous operation data with the remote controller ..........206
12.1 Instullation of wired remote controller (RC-E4) ...............................248
12.2 Wireles kit (FDTC series : RCN-TC-24W-ER) ....................................254
(5) Inverter checker for diagnosis of inverter output ................................207
..................................................................................210
(6) Outdoor unit controller failure diagnosis circuit diagram
12. OPTION PARTS .......................................................................................248
(2) Troubleshooting
....................................................................................209(1) List of troubles
11.2.2 Troubleshooting flow ....................................................................209
.....................208
12.3 Simple wired remote controoller (FDTC series : RCH-E3) ...............256
12.4 Interface kit (SC-BIKN-E) ....................................................................262
12.5 Super link E board (SC-ADNA-E) ......................................................266
عHow to read the model name
Example: SRK 20 Z
Series code
Inveter type
Product capacity
Model name SRK : Wall mounted type
SRC : Outdoor unit
SRF : Floor standing type
SRR : Ceiling concealed type
JX-S
Example: FDTC 25 VD
Series code
Product capacity
Model name 䈀Ceiling cassette-4way compact type䈁

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Read together with indoor unit's installation manual.
Accessories Remote controller, wood screw (ø3.5 16) 2 pieces
Prepare on site Remote controller cord (2 cores) the insulated thickness in 1mm or more.
[In case of embedding cord] Erectrical box, M4 screw (2 pieces)
[In case of exposing cord] Cord clamp (if needed)
Screw
Installation procedure
Open the cover of remote controller , and remove the screw under the
buttons without fail.
Remove the upper case of remote controller.
Insert a flat-blade screwdriver into the dented part of the upper part
of the remote controller, and wrench slightly.
[In case of embedding cord]
Embed the erectrical box and remote controller cord beforehand.
Prepare two M4 screws (recommended length is 12-16mm) on site, and install the lower case to erectrical box.
Choose either of the following two positions in fixing it with screws.
Connect the remote controller cord to the terminal block.
Connect the terminal of remote controller (X,Y) with the terminal of
indoor unit (X,Y). (X and Y are no polarity)
Install the upper case as before so as not to catch up the remote controller cord,
and tighten with the screws.
[In case of exposing cord]
You can pull out the remote controller cord from left upper part or center upper part.
Cut off the upper thin part of remote controller lower case with a nipper or knife,
and grind burrs with a file etc.
Install the lower case to the flat wall with attached two wooden screws.
WARNING
CAUTION
Fasten the wiring to the terminal securely and hold the cable securely so as not to apply unexpected stress on the
terminal.
Loose connection or hold will cause abnormal heat generation or fire.
Make sure the power supply is turned off when electric wiring work.
Otherwise, electric shock, malfunction and improper running may occur.
DO NOT install the remote controller at the following places in order to avoid malfunction.
DO NOT leave the remote controller without the upper case.
(1) Places exposed to direct sunlight
(2) Places near heat devices
(3) High humidity places
In case the upper cace needs to be detached, protect the remote controller with a packaging box or bag in
order to keep it away from water and dust.
(4) Hot surface or cold surface enough to generate condensation
(5) Places exposed to oil mist or steam directly
(6) Uneven surface
Tighten the screws after
cutting off the thin part of
screw mounting part.
Controller cord
Erectrical box
(Prepare on site)
Lower part Lower part
Upper part
Lower case Lower case
Wiring oulet
Wiring oulet
M4 screw 2 (Prepare on site)
The thin part
Upper part
Lower
Lower case
Upper
Lower
Lower case
Upper
12. OPTION PARTS
12.1 Instullation of wired remote controller (RC-E4) A
PJA012D729A

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Installation and wiring of remote controller
Wiring of remote controller should use 0.3mm
2
2 core wires or cables. (on-site configuration)
Maximum prolongation of remote controller wiring is 600 m.
100 - 200m.........................0.5mm
2
2 cores
Under 300m.......................0.75mm
2
2 cores
Under 400m.......................1.25mm
2
2 cores
Under 500m.......................2.0mm
2
2 cores
Master/ slave setting when more than one remote controllers are used
A maximum of two remote controllers can be connected to one indoor unit (or one group of indoor units.)
Remote controller cord (no polarity)
Remote controller
SW1 "Master"
Switch Setting Contents
M Master remote controller
SW1 S Slave remote controller
The indication when power source is supplied
When power source is turned on, the following is displayed on the remote controller until the
communication between the remote controller and indoor unit settled.
Master remote controller : " "
Slave remote controller : " "
At the same time, a mark or a number will be displayed for two seconds first.
This is the software's administration number of the remote controller, not an error cord.
When remote controller cannot communicate with the indoor unit for half an hour, the below indication will
appear.
Check wiring of the indoor unit and the outdoor unit etc.
Connect the remote controller cord to the
terminal block.
Connect the terminal of remote controller (X,Y)
with the terminal of indoor unit (X,Y).
(X and Y are no polarity)
Wiring route is as shown in the right diagram
depending on the pulling out direction.
The wiring inside the remote controller case should be within 0.3mm
2
(recommended) to 0.5mm
2
.
The sheath should be peeled off inside the remote controller case.
The peeling-off length of each wire is as below.
Pulling out from upper left
Pulling out from upper center
X wiring : 215mm
Y wiring : 195mm
X wiring : 170mm
Y wiring : 190mm
Install the upper case as before so as not to catch up the remote controller cord, and tighten with
the screws.
In case of exposing cord, fix the cord on the wall with cord clamp so as not to slack.
In case of pulling out from
upper left In case of pulling out from
upper center
The peeling-off length
of sheath
Wiring Wiring
Upper Upper
Sheath
Upper case Upper case
Board Board
Lower Lower
If the prolongation is over 100m, change to the size below.
But, wiring in the remote controller case should be under 0.5mm
2
. Change the wire size outside
of the case according to wire connecting. Waterproof treatment is necessary at the wire
connecting section. Be careful about contact failure.
Remote controller
SW1 "Slave"
Lower
Master
Slave
Upper
Board
The left mark is only an
example. Other marks may
appear.
Sheath
Indoor units
Set SW1 to "Slave" for the slave remote controller. It was factory set to "Master" for shipment.
Note: The setting "Remote controller thermistor enabled" is only selectable with the master remote
controller in the position where you want to check room temperature.
The air conditioner operation follows the last operation of the remote controller regardless of the
master/ slave setting of it.
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The range of temperature setting
When shipped, the range of set temperature differs depending on the operation mode as below.
Heating : 16~30˚C (55~86˚F)
Except heating (cooling, fan, dry, automatic) : 18~30˚C (62~86˚F)
Upper limit and lower limit of set temperature can be changed with remote controller.
Upper limit setting: valid during heating operation. Possible to set in the range of 20 to 30˚C (68 to 86˚F).
Lower limit setting: valid except heating (automatic, cooling, fan, dry) Possible to set in the range of 18 to 26˚C (62 to
79˚F).
When you set upper and lower limit by this function, control as below.
1. When TEMP RANGE SET, remote controller function of function setting mode is "INDN CHANGE" (factory setting),
During heating, you cannot set the value exceeding the upper limit.
During operation mode except heating, you cannot set the value below the lower limit.
2. When TEMP RANGE SET, remote controller function of function setting mode is "NO INDN CHANGE"
During heating, even if the value exceeding the upper limit is set, upper limit value will be sent to the indoor unit.
But, the indication is the same as the temperature set.
During except heating, even if the value lower than the lower limit is set, lower limit value will be sent to the indoor unit.
But, the indication is the same as the temperature set.
How to set upper and lower limit value
1. Stop the air-conditioner, and press (SET) and (MODE) button at the same time for over three
seconds .
The indication changes to "FUNCTION SET ".
2. Press button once, and change to the "TEMP RANGE " indication.
3. Press (SET) button, and enter the temperature range setting mode.
4. Select "UPPER LIMIT " or "LOWER LIMIT " by using button.
5. Press (SET) button to fix.
6. When "UPPER LIMIT " is selected (valid during heating)
Press (SET) button to fix. Indication example: "UPPER 26˚C" (Displayed for two seconds)
After the fixed upper limit value displayed for two seconds, the indication will return to "UPPER LIMIT ".
7. When "LOWER LIMIT " is selected (valid during cooling, dry, fan, automatic)
Indication: " SET UP" "LOWER 18˚C "
8. Press ON/OFF button to finish.
Previous button
If upper limit value is set
If upper limit value is set
If lower limit value is set
If lower limit value is set
Indication: " SET UP" "UPPER 30˚C "
Select the upper limit value with temperature setting button . Indication example: "UPPER 26˚C "
(blinking)
Select the lower limit value with temperature setting button . Indication example: "LOWER 24˚C "
(blinking)
Press (SET) button to fix. Indication for example: "LOWER 24˚C" (Displayed for two seconds)
After the fixed lower limit value displayed for two seconds, the indication will return to "LOWER LIMIT ".
It is possible to finish by pressing
ON/OFF button on the way, but
unfinished change of setting is
unavailable.
During setting, if you press
(RESET) button, you return to the
previous screen.

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[Flow of function setting]
01
When you use at 50Hz area
When you use at 60Hz area
Automatical operation is impossible
Temperature setting button is not working
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
Consult the technical data etc. for each control details
Finalize : Press “ ” (SET) button.
Reset : Press “ ” (RESET) button.
Select : Press button.
End : Press ON/OFF button.
It is possible to finish above setting on the way,
and unfinished change of setting is unavailable.
“ ” : Initial settings
“ ” : Automatic criterion
Record and keep the
setting
Stop air-conditioner and press
(SET) + (MODE) buttons
at the same time for over three seconds.
Function setting
Mode button is not working
On/Off button is not working
Fan speed button is not working
Louver button is not working
Timer button is not working
Remote thermistor is not working.
Remote thermistor is working.
Remote thermistor is working, and to be set for producing +3.0˚C increase in temperature.
Remote thermistor is working, and to be set for producing +2.0˚C increase in temperature.
Remote thermistor is working, and to be set for producing +1.0˚C increase in temperature.
Remote thermistor is working, and to be set for producing -1.0˚C increase in temperature.
Remote thermistor is working, and to be set for producing -2.0˚C increase in temperature.
Remote thermistor is working, and to be set for producing -3.0˚C increase in temperature.
If you change the range of set temperature, the indication of set temperature
will vary following the control.
If you change the range of set temperature, the indication of set temperature
will not vary following the control, and keep the set temperature.
If you change the remote controller function "14 ",
you must change the indoor function "04 " accordingly.
You can select the louver stop position in the four.
The louver can stop at any position.
In normal working indication, indoor unit temperature is indicated instead of airflow.
(Only the master remote controller can be indicated.)
Heating preparation indication should not be indicated.
Temperature indication is by degree C
Temperature indication is by degree F
ON/OFF button
(finished)
Start : Stop air-conditioner and press “ ” (SET) and
“ ” (MODE) buttons at the same time for over three seconds.
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In case of Single split series, by connecting ventilation device to CNT of the
indoor printed circuit board (in case of VRF series, by connecting it to CND of the
indoor printed circuit board), the operation of ventilation device is linked with the
operation of indoor unit.
In case of Single split series, by connecting ventilation device to CNT of the indoor printed
circuit board (in case of VRF series, by connecting it to CND of the indoor printed circuit
board), you can operate /stop the ventilation device independently by (VENT) button.
The initial function setting for typical using is performed automatically by the indoor unit connected, when remote
controller and indoor unit are connected.
As long as they are used in a typical manner, there wiil be no need to change the initial settings.
If you would like to change the initial setting marked “ ”, set your desired setting as for the selected item.
The procedure of functional setting is shown as the following diagram.
If you input signal into CNT of the indoor printed circuit board from external, the
indoor unit will be operated independently according to the input from external.
If you input into CNT of the indoor printed circuit board from external, all units which
connect to the same remote controller are operated according to the input from external.
Airflow of fan becomes of - - or the four speed of - - - .
Airflow of fan becomes of - .
Airflow of fan becomes of - .
Airflow of fan is fixed at one speed.
The functional setting

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Note 1: The initial setting marked “ ” is decided by connected indoor and outdoor unit, and is automatically defined as following table.
Function No.
Remote controller
function02
Remote controller
function06
Remote controller
function07
Remote controller
function13
Remote controller
function15
Default Model
Indoor unit with only one of air flow setting
Heat pump unit
Exclusive cooling unit
"Auto-RUN" mode selectable indoor unit.
Indoor unit without "Auto-RUN" mode
Indoor unit with two or three step of air flow setting
Indoor unit with only one of air flow setting
Indoor unit with automatically swing louver
Indoor unit without automatically swing louver
Indoor unit with three step of air flow setting
Indoor unit with two step of air flow setting
Item
Note 3: As for plural indoor unit, set indoor functions to each master and slave indoor unit.
But only master indoor unit is received the setting change of indoor unit function “05 EXTERNAL INPUT” and “06 PERMISSION /
PROHIBISHION”.
Indoor unit No. are indicated only when
plural indoor units are connected.
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Permission/prohibition control of operation will be valid.
Function
setting
The filter sign is indicated after running for 180 hours.
The filter sign is indicated after running for 600 hours.
The filter sign is indicated after running for 1000 hours.
The filter sign is indicated after running for 1000 hours, then the indoor unit will be stopped by
compulsion after 24 hours.
If you change the indoor function "04 ",
you must change the remote controller function "14 " accordingly.
You can select the louver stop position in the four.
The louver can stop at any position.
With the VRF series, it is used to stop all indoor units connected with the same outdoor unit immediately.
When stop signal is inputed from remote on-off terminal "CNT-6", all indoor units are stopped immediately.
To be reset for producing +3.0˚C increase in temperature during heating.
To be reset for producing +2.0˚C increase in temperature during heating.
To be reset for producing +1.0˚C increase in temperature during heating.
To be reset producing +2.0˚C increase in return air temperature of indoor unit.
To be reset producing +1.5˚C increase in return air temperature of indoor unit.
To be reset producing +1.0˚C increase in return air temperature of indoor unit.
To be reset producing -1.0˚C increase in return air temperature of indoor unit.
To be reset producing -1.5˚C increase in return air temperature of indoor unit.
To be reset producing -2.0˚C increase in return air temperature of indoor unit.
When heating thermostat is OFF, to be operated with low fan speed. (or with ultra low fan speed in case of some models)
When heating thermostat is OFF, to be operated with set fan speed.
When heating thermostat is OFF, fan speed is operated intermittently.
When heating thermostat is OFF, the fan is stopped.
When the remote thermistor is working, "FAN OFF" is set automatically.
Do not set "FAN OFF" when the indoor unit's thermistor is working.
Drain pump is run during cooling and dry.
Drain pump is run during cooling, dry and heating.
Drain pump is run during cooling, dry, heating and fan.
Drain pump is run during cooling, dry and fan.
After cooling is stopped or cooling thermostat is OFF, the fan does not perform extra operation.
After cooling is stopped or cooling thermostat is OFF, the fan perform extra operation for half an hour.
After cooling is stopped or cooling thermostat is OFF, the fan perform extra operation for an hour.
After cooling is stopped or cooling thermostat is OFF, the fan perform extra operation for six hours.
After heating is stopped or heating thermostat is OFF, the fan does not perform extra operation.
After heating is stopped or heating thermostat is OFF,the fan perform extra operation for half an hour.
After heating is stopped or heating thermostat is OFF,the fan perform extra operation for two hours.
After heating is stopped or heating thermostat is OFF, the fan perform extra operation for six hours.
During heating is stopped or heating thermostat is OFF, the fan perform intermittent operation for five minutes
with low fan speed after twenty minutes' OFF.
During heating is stopped or heating thermostat is OFF, the fan perform intermittent operation for five minutes
with low fan speed after five minutes' OFF.
Connected “OA Processing” type indoor unit, and is automatically defined.
Working only with the Single split series.
To control frost prevention, the indoor fan tap is raised.
Change of indoor heat exchanger temperature to start frost prevention control.
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17
Note2: Fan setting of "HIGH SPEED"
Initial function setting of some indoor unit is "HIGH SPEED".
4 speed is not able to be set with wireless remote controller or simple remote controller (RCH-H3).
PHi - HiPHi - MePHi - Hi - Me
STANDARD
HIGH
SPEED1, 2
FAN
SPEED
SET
Hi - Lo Hi - Me
-------
Hi - Me - Lo
PHi - PHi - Hi - Me
PHi - Hi - Me - Lo
Indoor unit air flow setting
Fan tap