Mitsubishi Electric Mr.SLIM PEH Series Operating manual

TECHNICAL & SERVICE MANUAL
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
CONTENTS
1. FEATURES ···········································2
2. PART NAMES AND FUNCTIONS········3
3. SPECIFICATIONS·································6
4. DATA·····················································8
5. OUTLINES AND DIMENSIONS··········14
6. WIRING DIAGRAM·····························18
7. REFRIGERANT S STEM DIAGRAM ······19
8. OPERATION FLOW-CHART··············20
9. MICROPROCESSOR CONTROL·······24
10. TROUBLESHOOTING························41
11. DISASSEMBL PROCEDURE···········49
12. PARTS LIST········································51
13. OPTIONAL PARTS·····························55
Indoor unit
PEH-2.5EKHA
PEH-3EKHA
PEH-4EKHSA
PEH-5EKHSA
No. OC153
[Models]
PEH-2.5EKHA2.TH
PEH-3EKHA2.TH
PEH-4EKHSA2.TH
PEH-5EKHSA2.TH
[Service Ref.]
This manual does not over the following
outdoor units. When servi ing them,
please refer to the servi e manual
No.OC128,150 and this manual in a set.
[Servi e Ref.]
PUH-2.5VKA2
PUH-3VKA2,3YKA2
PUH-4YKSA3
PUH-5YKSA3
PUH-2.5VKA2.UK
PUH-3VKA2.UK
PUH-3YKA2.UK
PUH-4YKSA2.UK
PUH-5YKSA2.UK
Indoor unit
Ceiling Concealed
Series PEH
The Slim Line.
From Mitsubishi Electric.
FILTER
CHECK MODE
TEST RUN
Remote controller

2
1FEATURES
Indoor unit
Ceiling Concealed
Series PEH
Remote ontroller
FILTER
CHECK MODE
TEST RUN
Outdoor unit
1. TOTALL INVISIBLE INDOOR UNIT BEHIND THE CEILING
The totally hidden indoor unit that lies above the eiling surfa e enables you to utilize full floor spa e while allowing for flex-
ible interior design. This new feature is re ommended for stores and offi es where the user´s own image is allowed to be
in orporated.
2. MOST SUITABLE FOR SIMULTANEOUS TWO ROOMS AIR CONDITIONING
Using air du ts for ooling / heating airflow that mat hes with the stru ture and purpose of the room enables you to provide
two air outlets for simultaneous ooling / heating of two rooms.
3. HIGH EXTERNAL STATIC PRESSURE
The a eptable external stati pressure of 127Pa (12.7mmAq) allows long du ts to be used more extensively to a hieve on-
venient lo ation of indoor units.
4. ADVANCED MICROPROCESSOR
(1) Easy to use mi ropro essor
1) Ultra-thin remote ontroller
The streamlined, square ontroller is designed to blend well with any interior. Also, the sophisti ated mi ropro essor
allows you to easily arry out a wide range of operations.
2) Attra tive liquid rystal display (LCD)
The unit´s operation mode, set temperature, room temperature, timer setting, and fan speed are displayed on the remote
ontroller´s easy-to-read Liquid Crystal Display (LCD).
3) Convenient 24-hour ON-OFF timer
The timer swit hes Mr. SLIM on and off automati ally at the time you set. On e the timer is set, the remaining time is
shown on the LCD.
4) Self-diagnosti feature indi ates faults instantly
If a problem o urs, the unit will stop operating and the set temperature indi ator will hange to a self-diagnosti indi-
ator, whi h shows the lo ation of the trouble.
If the he k swit h is pressed twi e, the unit stops operating and the he k mode is initiated. The lo ation of the most
re ent problem that was stored in the memory is displayed on the LCD. This is extremely useful for maintenan e pur-
poses.
5) Useful memory feature for storing instru tions
The previous set value is memorized so that onstant temperature ontrol an be a hieved. For example, if a power
failure o urs, the temperature will not have to be readjusted afterwards.
air outlet air outlet
Air outlet du t Air intake du t
air intake
Service Ref. Cooling capacity / Heating capacity (with Heater)
W Btu / h
PEH-2.5EKHA2.TH 6,400/6,700 (8,800) 21,800/22,900 (30,000)
PEH-3EKHA2.TH 7,700/8,300 (10,400) 26,300/28,300 (35,500)
PEH-4EKHSA2.TH 9,700/10,400(12,800) 33,100/35,500 (43,700)
PEH-5EKHSA2.TH 12,400/13,000(16,000) 42,300/44,400 (54,600)

3
PART NAMES AND FUNCTIONS
2
●Indoor (Main) Unit
Air intake duct flange
Air outlet duct flange
Air outlet
Air intake
(sucks the air inside the room into the unit)
(2) Non- polar two-wire remote ontroller able
The slim, non-polar, two-wire remote ontroller able makes installation simple and troublefree. Also, the remote on-
troller wire an be extended up to 500m.
(3)Automati ooling / heating hangeover operation
An automati ooling and heating hangeover operation system allows you to easily ontrol omfortable year-round air
onditioning.
On e the desired temperature is set, unit operation swit hes automati ally between ooling and heating, in a ordan e
with the room temperature. In addition, the use of an outdoor unit fan speed ontroller allows ooling even when out-
door temperatures are as low as -5 °C.
5. INNOVATIVE MICROPROCESSOR CONTROL S STEM
The most signifi ant feature of PEH-EKH(S)A series is the advan ed mi ropro essor ontrol. The development of this sys-
tem is due to the re ent world-wide trend in the air onditioning of larger buildings. They are moving away form entralized
du t systems to using individual split type units instead. There are a number of reasons for this hange. First of all, the du t
´s ostly and troublesome installation is eliminated. Se ond, the overall air onditioning balan e is ex ellent in split type units.
Lastly, the operation osts are low due to the flexible ontrol of ea h unit. This system was developed ex lusively by
Mitsubishi Ele tri be ause of high demand. The mi ropro essor ontrol makes individual ontrol, group ontrol, ontrol
using two remote ontrollers, remote on / off ontrol and individual ontrol possible without troublesome equipment modifi-
ations.

4
● Remote controller
● Operation buttons
● On e the operation of the unit is
set, subsequent operations an
only be performed by pressing
the ON/OFF button repeately.
FILTER
CHECK MODE
TEST RUN
050
wwbutton
This swit hes between
ontinuous operation and
the timer operation.
qqbutton
This sets of swit hes the
urrent time. start time and
stop time.
aabutton
Press this button to swit h
the ooler ele troni dry
(dehumidify) automati and
heater modes.
iiTEMP button
This sets the room tem-
parature. The temparature
setting an be performed in
1°C units
Setting range
Cooler 19°C to 30°C
Heater 17°C to 28°C
This model name of the
remote ontroller is indi at-
ed.
ON/OFF button
This swit hes between the
operation and stop modes
ea h time it is pressed. The
lamp on this butoon lights
during operation.
(This button does not oper-
ate in this model)
FILTER button
This resets the filter servi e
indi ation display.
(This button does not oper-
ate in this model)
llbutton
This sets the ventilation fan
speed.
kkbutton
This swit hes the horizon-
tal fan motion ON and OFF.
(This button does not oper-
ate in this model)
CHECK-TEST RUN button
Only press this button to
perform an inspe tion
he k or test operation. Do
not use it for nomal opera-
tion.
button
This adjusts the verti al
angle of the ventilation.

5
FILTER
CHECK MODE
TEST RUN
050
Caution
●Only the display lights when the unit is stopped and power supplied to the unit.
●When power is turned ON for the first time the (CENTRAL CTRL) display appears to go off momentarily but this is not a
malfun tion.
●When the entral ontrol remote ontrol unit, whi h is sold separately, is used the ON-OFF button, abutton and
iTEMP button do not operate.
●“NOT AVAILABLE” is displayed when the kbutton and jbutton are pressed.This indi ates that this room unit is not
equipped with the fan dire tion adjustment fun tion and the louver fun tion.
Operation lamp
This lamp lights during operation,
goes off when the unit stops and
flashes when amalfun tion o urs.
CENTRALLY
CONTROLLED display
This indi ates when the unit is on-
trolled by optional features su h as
entral ontrol type remote ontroller.
wdisplay
This indi ates when the ontinous
operation and time operation modes
are set.
It also display the time for the timer
operation at the same time as when
it is set.
OPERATION MODE display
This indi ates the operation mode.
STANDBY display
This indi ates when the standby
mode is set from the time the sleep
operation starts until the heating air
is dis harged.
DEFROST display
This indi ates when the defrost oper-
ation is performed.
CHECK display
This indi ates when a malfun tion
has o urred in the unit whi h should
be he ked.
/display
This lamp lights when ele tri ity is
supplied to the unit.
—88°C display
This displays the sele ted setting
temperature.
rdisplay
The urrent time , start time and stop
time an be displayed in tense ond
intervals by pressing the time swit h
button. The start time or stop time is
always displayed during the timer
operation.
ldisplay
The sele ted fan speed is displayed.
●Display
—88°C display
The temperature of the su tion air is
displayed during operation. The dis-
play range is 8° to 39°C. The display
flashes 8°C when the a tual temper-
ature is less than 8° and flashes
39°C when the a tual temperature is
greater than 39°C.
In this display example on the bottom left, a ondi-
tion where all display lamps light is shown for
explanation purposes although this differs from
a tual operation.
display
This display lights in the he k mode
or when a test operation is per-
formed.
CHECK MODE
TEST RUN

6
3 SPECIFICATIONS
w1 Rating ondition <JIS B 8616>
(INDOOR) Cooling : 27: D.B.,19:W.B. Heating : 20: D.B.
(OUTDOOR) Cooling : 35: D.B. Heating : 7: D.B.,6: W.B.
w2 Noise level : Sound pressure level
PEH-2.5EKHA2 .TH PEH-3EKHA2 .TH
Cooling
21,800
6,400
2.85

Cooling
26,300
7,700
3.54

Cooling
26,300
7,700
3.54

Heating
0.39
1.66
2.30
47<104> 48<106>
0.39(2.49)
1.66(10.41)
2.30(11.1)
0.39
1.66
2.30
0.39(2.49)
1.66(10.41)
2.30(11.1)
0.39
1.66
2.30
0.39(2.49)
1.66(10.41)
2.30(11.0)
Galvanized sheets 
Plate fin oil 
Centrifugal (dire t) 
0.23 
22-27<780-950> 
127 (12.7) at Hi-not h 
2.1 
Remote ontrol & built-in 
52 - 55 
32 <1-1/4> 
785 <31> 
690 <27-1/6> 
428 <16-7/8>
 
2.46
10.68
52
2.23
9.78
52
3.15
13.82
58
2.94
12.89
58
3.15
5.16
37
2.94
4.81
37
Munsell 5Y 7/1 
Capillary tube 
Hermeti  
NH41VMD 
2.0 NH52VND  2.2
Line start
Plate fin oil 
Propeller (dire t)o1
50<1.764>
Reverse y le 
52 
870 <32-1/4> 
295+24 <11-5/8 add 1> 
850 <33-7/16> 
9.52 <3/8> 
15.88 <5/8> 
Flared 
Flared 
Max. 50m 
Max. 50m 
NH52YDA 
2.4
Internal thermostat,HP swit h
Internal thermostat,HP swit h
Thermal relay, Thermal swit h,
HP swit h,Anti-phase prote tor.
0.085 0.085
68 <150> 75 <165>
2.8 <6.2> R-22 3.2 <7.1>
PEH-2.5EKHA2 .TH
Single, 50Hz, 220-240V PEH-3EKHA2 .TH Single, 50Hz, 220-240V
Btu/h
W
kW

kW
A
A

kW
K/min,<CFM> 
Pa(mmAq)
kW

dB(A)
mm,(in)
mm,(in)
mm,(in)
mm,(in)
kg,(lbs)

kW
A
A

kW

kW
K/min,<CFM> 

dB(A)
mm,(in)
mm,(in)
mm,(in)
kg,(lbs)

kg,(lbs)
mm,(in)
mm,(in)
W
D
H
W
D
H

Liquid
Gas
REFRIGERANT PIPING
OUTDOOR UNIT INDOOR UNIT
Indoor side
Outdoor side
Height differen e 
Piping length
Item
Fun tion 
Capa ity
 
Total input
Service Ref.
Power supply(phase, y le,voltage) 
Input
Running urrent
Starting urrent
External finish
Heat ex hanger
Fan(drive) o No.
Fan motor output
Airflow(Low-High)
External stati pressure
Booster heater
Operation ontrol & Thermostat
Noise level(Low-High) w2
Cond. drain onne tion O.D.

Dimensions

Weight
Service Ref.
Power supply (phase, y le, voltage)
Input
Running urrent
Starting urrent
External finish
Refrigerant ontrol
Compressor
Model
Motor output
Starter type
Prote tion devi es
Heat ex hanger
Fan(drive) o No.
Fan motor output
Airflow
Defrost method
Noise level w2

Dimensions

Weight
Refrigerant
Charge
Pipe size O.D.
Conne tion method
Between the indoor & 
outdoor unit
Service Ref.
w1
PUH-2.5VKA2 (.UK)
Single, 50Hz, 220-240V 
PUH-3VKA2 (.UK)
Single, 50Hz, 220-240V 
PUH-3YKA2(.UK)
3,50Hz, 380-415V(4wires)
22,900
(30,000)
6,700
(8,800)
2.62
(4.72)
Heating
28,300
(35,500)
8,300
(10,400)
3.33
(5.43)
Heating
28,300
(35,500)
8,300
(10,400)
3.33
(5.43)

7
PEH-4EKHSA2.TH PEH-5EKHSA2.TH
Cooling
33,100
9,700
3.64

Heating Cooling
42,300
12,400
4.86
0.44
1.87
2.60
0.24
27-34(950-1200)
(2.4)
1055<41-1/2> 1255<49-7/16>
61<134>
3,50Hz,380-415V(4wires)
75<165>
(3.0)
0.28
34-42(1200-1480)
0.44(2.84)
1.87(11.87)
2.60(12.6)
0.65
2.76
3.20
0.65(3.65)
2.76(15.20)
3.20(15.7)
Single, 50Hz, 220-240V
Galvanized sheets 
Plate fin oil 
Centrifugal (dire t)o2 
 
127 (12.7) at Hi-not h 

Remote ontrol & built-in 
54 - 58 
32 <1-1/4> 

690 <27-1/6> 
428 <16-7/8> 
3.20
5.24
40
3.19
5.22
40
4.21
6.89
53
4.16
6.81
53
Musell 5Y 7/1 
Capillary tube 
Hermeti  
NH56YDA 
2.7 ZR61K3-TFD 3.5
Line start

Plate fin oil
Propeller(dire t)o2
95<3.350> 
Reverse y le
 
1,258 <49-1/2> 

9.52 <3/8> 
19.5 <3/4> 
Flared 
Flared 
Max. 50m 
Max. 50m 
0.065+0.065
Thermal relay, Thermal swit h,HP swit h, Anti-phase prote tor Internal thermostat,Thermal swit h,HP swit h, Anti-phase prote tor
94<207> 114<251>
4.2<9.27> 5.4<11.9>
54
870<34-1/4>
295+24<11-5/8 add 1>
55
970<38-3/16>
345+24<13-9/16 add 1>
0.085+0.085
R-22
PEH-4EKHSA2.TH PEH-5EKHSA2.TH
Btu/h
W
kW

kW
A
A

kW
K/min,<CFM> 
Pa(mmAq)
kW

dB(A)
mm,(in)
mm,(in)
mm,(in)
mm,(in)
kg,(lbs)

kW
A
A

kW

kW
K/min,<CFM> 

dB(A)
mm,(in)
mm,(in)
mm,(in)
kg,(lbs)

kg,(lbs)
mm,(in)
mm,(in)
W
D
H
W
D
H

Liquid
Gas
REFRIGERANT PIPING
OUTDOOR UNIT INDOOR UNIT
Indoor side
Outdoor side
Height differen e 
Piping length
Item
Fun tion 
Capa ity
 
Total input 
Service Ref.
Power supply(phase, y le,voltage) 
Input
Running urrent
Starting urrent
External finish
Heat ex hanger
Fan(drive) o No.
Fan motor output
Airflow(Low-High)
External stati pressure
Booster heater
Operation ontrol & Thermostat
Noise level(Low-High) w2
Cond. drain onne tion O.D.

Dimensions

Weight
Service Ref.
Power supply (phase, y le, voltage)
Input
Running urrent
Starting urrent
External finish
Refrigerant ontrol
Compressor
Model
Motor output
Starter type
Prote tion devi es
Heat ex hanger
Fan(drive) o No.
Fan motor output
Airflow
Defrost method
Noise level w2

Dimensions

Weight
Refrigerant
Charge
Pipe size O.D.
Conne tion method
Between the indoor & 
outdoor unit
Service Ref.
w1
PUH-4YKSA3(2.UK) PUH-5YKSA3(2.UK)
35,500
(43,700)
10,400
(12,800)
3.63
(6.03)
Heating
44,400
(54,600)
13,000
(16,000)
4.81
(7.81)

w1 Rating ondition <JIS B 8616>
(INDOOR) Cooling : 27: D.B.,19:W.B. Heating : 21: D.B.
(OUTDOOR) Cooling : 35: D.B. Heating : 7: D.B.,6: W.B.
w2 Noise level : Sound pressure level

8
4DATA
1 PERFORMANCE DATA
1) COOLING CAPACITY
Note CA : Capa ity (W)
P.C. : Power onsumption (kW)
Cooling apa ity orre tion fa tors
P.C.CA
6,457
6,875
7,297
7,724
7,768
8,271
8,779
9,293
9,786
10,419
11,060
11,707
12,510
13,319
14,138
14,965
2.28
2.33
2.37
2.42
2.84
2.89
2.95
3.00
2.92
2.98
3.03
3.09
3.90
3.97
4.05
4.12
16
18
20
22
16
18
20
22
16
18
20
22
16
18
20
22
20
P.C.CA
6,280
6,694
7,126
7,576
7,555
8,053
8,573
9,115
9,518
10,145
10,800
11,482
12,167
12,969
13,806
14,679
2.38
2.43
2.48
2.53
2.96
3.02
3.08
3.14
3.04
3.10
3.17
3.23
4.06
4.14
4.23
4.31
25
P.C.CA
6,049
6,450
6,871
7,314
7,278
7,760
8,267
8,799
9,168
9,775
10,414
11,085
11,720
12,496
13,313
14,170
2.56
2.62
2.68
2.74
3.19
3.26
3.33
3.40
3.28
3.35
3.42
3.50
4.37
4.47
4.57
4.67
30
P.C.CA
5,804
6,194
6,606
7,040
6,983
7,452
7,948
8,470
8,797
9,388
10,012
10,670
11,245
12,001
12,799
13,640
2.75
2.82
2.88
2.95
3.41
3.50
3.58
3.67
3.51
3.60
3.68
3.77
4.69
4.80
4.92
5.04
35
P.C.CA
5,545
5,926
6,330
6,756
6,671
7,130
7,616
8,128
8,426
8,994
9,596
10,230
10,771
11,497
12,266
13,078
2.93
3.01
3.09
3.18
3.64
3.74
3.84
3.95
3.75
3.84
3.94
4.06
5.00
5.13
5.27
5.41
40
P.C.CA
5,271
5,646
6,043
6,461
6,342
6,793
7,270
7,773
8,018
8,577
9,168
9,791
10,249
10,964
11,720
12,516
3.12
3.20
3.30
3.41
3.88
3.98
4.10
4.23
3.98
4.09
4.21
4.35
5.32
5.46
5.62
5.81
45
Outdoor intake air D.B.°CIndoor
Intake
air
W.B.°C
Service Ref.
PEH-2.5EKHA2.TH
PEH-3EKHA2.TH
PEH-4EKHSA2.TH
PEH-5EKHSA2.TH
Service Ref.
PEH-2.5EKHA2.TH
PEH-3EKHA2.TH
PEH-4EKHSA2.TH
PEH-5EKHSA2.TH
5m
1.00
1.00
1.00
1.00
10m
0.989
0.981
0.989
0.981
15m
0.980
0.968
0.980
0.968
20m
0.970
0.952
0.970
0.952
25m
0.960
0.940
0.960
0.940
30m
0.950
0.925
0.950
0.925
Refrigerant piping length (one way)
35m
0.940
0.913
0.940
0.913
40m
0.930
0.900
0.930
0.900
45m
0.920
0.886
0.920
0.886
50m
0.910
0.874
0.910
0.874

9
2) HEATING CAPACITY
Note CA :Capa ity (W)
P.C. :Power onsumption (kW)
Heating apa ity orre tion fa tors
P.C.CA
4,588
4,393
4,222
5,684
5,443
5,230
7,122
6,820
6,554
8,903
8,524
8,192
1.79
1.93
2.04
2.27
2.45
2.60
2.48
2.67
2.83
3.28
3.54
3.75
15
20
25
15
20
25
15
20
25
15
20
25
-10
P.C.CA
5,259
5,052
4,847
6,514
6,259
6,004
8,163
7,842
7,524
10,203
9,803
9,404
1.98
2.13
2.27
2.51
2.71
2.88
2.74
2.95
3.14
3.63
3.91
4.17
-5
P.C.CA
5,994
5,768
5,539
7,425
7,145
6,861
9,303
8,953
8,597
11,629
11,191
10,747
2.18
2.34
2.51
2.76
2.98
3.19
3.01
3.25
3.47
3.99
4.30
4.60
0
P.C.CA
6,792
6,539
6,297
8,414
8,101
7,801
10,543
10,150
9,774
13,179
12,688
12,218
2.39
2.57
2.75
3.03
3.27
3.50
3.31
3.56
3.82
4.38
4.72
5.06
5
P.C.CA
7,653
7,366
7,121
9,481
9,125
8,822
11,880
11,434
11,054
14,850
14,292
13,817
2.61
2.81
3.02
3.32
3.58
3.83
3.62
3.90
4.18
4.80
5.16
5.54

10
P.C.CA
8,576
8,247
8,011
10,624
10,217
9,924
13,312
12,802
12,435
16,640
16,002
15,544
2.85
3.07
3.29
3.62
3.90
4.18
3.95
4.25
4.56
5.23
5.63
6.04
15
Outdoor intake air D.B.°CIndoor
Intake
air
W.B.°C
Service Ref.
PEH-2.5EKHA2.TH
PEH-3EKHA2.TH
PEH-4EKHSA2.TH
PEH-5EKHSA2.TH
Service Ref.
PEH-2.5EKHA2.TH
PEH-3EKHA2.TH
PEH-4EKHSA2.TH
PEH-5EKHSA2.TH
5m
1.00
1.00
1.00
1.00
10m
1.00
1.00
1.00
1.00
15m
1.00
1.00
1.00
1.00
20m
1.00
1.00
1.00
1.00
25m
1.00
1.00
1.00
1.00
30m
1.00
1.00
1.00
1.00
Refrigerant piping length (one way)
35m
0.998
0.998
0.998
0.998
40m
0.995
0.995
0.995
0.995
45m
0.993
0.993
0.993
0.993
50m
0.990
0.990
0.990
0.990

10
Heating
1.4
1.2
1.0
0.8
0.6
1.4
1.2
1.0
0.8
0.6
0.4
-12-10 -5 0 5 10 15
OUTDOOR W.B.(°C)
INDOOR D.B. (°C)
INDOOR D.B. (°C)
15
20
25
25
20
15
TOTAL INPUT (RATIO) CAPACITY (RATIO)
Cooling
2. PERFORMANCE CURVE
1.4
1.2
1.0
0.8
0.6
1.4
1.2
1.0
0.8
0.6
0.4
-5 5 15 253546
OUTDOOR D.B.(°C)
TOTAL INPUT (RATIO) CAPACITY (RATIO)
INDOOR W.B.(°C)
INDOOR W.B.(°C)
22
20
18
16
22
20
18
16