Mitsubishi Electric Mr.Slim PKH18FL Operating manual

TECHNICAL & SERVICE MANUAL
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
CONTENTS
1. FEATURES ·······························································2
2. PART NAMES AND FUNCTIONS····························3
3. SPECIFICATIONS·····················································4
4. DATA·········································································5
5. OUTLINES AND DIMENSIONS······························16
6. REFRIGERANT SYSTEM DIAGRAM ····················18
7. WIRING DIAGRAM·················································19
8. OPERATION FLOW-CHART··································20
9. MICROPROCESSOR CONTROL···························24
10. TROUBLESHOOTING············································41
11. DISASSEMBLY PROCEDURE ·······························45
12. PARTS LIST····························································48
TM
PKH18FL
PKH24FL
PKH30FL
PKH36FL
No. OC276
REVISED EDITION-A
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Wall Mounted
Series PKH
[Models]
Indoor unit
Remote controller
MODEL
SELECT
NOT AVAILABLE
SWING
CHECK
FAN
TEST
RUN
˚F
˚C
AMPMSTOP
START
Revision:
●The wrong descriptions in REFRIGERANT
SYSTEM DIAGRAM have been modified.
(Page 18.)
●The wrong descriptions in WIRING DIAGRAM
have been modified.
(Page 19.)
●Restrictor valve and capillary tube have been
added to "Specifications" of heat exchanger.
(Page 48.)
●Please void OC276.
OC276-A-1.qxp 03.11.25 9:04 AM Page 1

2
1FEATURES
Indoor unit
Remote controller
Models Cooling capacity / Heating capacity SEER
PKH18FL 18,000 / 18,600 [25,100] Btu/h 11.1
PKH24FL 24,000 / 25,000 [31,500] Btu/h 10.2
PKH30FL 30,000 / 33,000 [40,500] Btu/h 10.6
PKH36FL 34,200 / 38,000 [45,500] Btu/h 10.5
1. COMPACT DESIGN
The PKH series models have been downsized and now require such minimal wall space that they can even be installed
above windows.
2. LCD WIRELESS REMOTE CONTROLLER
The new wireless remote controller has a larger easy-to-read temperature display, and executes ON/OFF commands
and temperature settings with a press of the button.
3. AUTO FLAP SHUTTER
With a simple flick of the OFF switch the air outlet can be closed off with a shutter. The shutter also functions as a flap
during operation to adjust the air flow angle, with “Auto Angle 1” securing a comfortable air flow.
4. INSTALLATION : FAST AND EASILY ADAPTABLE
(1) Multi-directional piping
Multi directional drain and refrigerant piping radically improves flexibility in selecting installation layouts.
PKH18/24/30/36FL models boast refrigerant piping in 4 directions and drain piping in 2 directions.
(2) Back plate installation guide
The back plate installation guide gives clear instructions on installation positions. The enlarged back plate secures the
unit firmly to the wall, while the support piece which lifts the unit makes left side piping work much easier.
(3) Easily removable filter and convenient wireless remote controller
The presence of thumb screws on the filters means that the filters can be quickly and smoothly removed.
5. HIGH RELIABILITY AND EASY SERVICING
In addition to the self-diagnostic function, units are also equipped with a 3-minute time delay mechanism (cooling), an auto
restart function, an emergency operation function, a test run switch, etc., to assure high reliability and easy servicing.
6. NITROGEN GAS IS CHARGED TO INDOOR UNIT
Indoor unit and refrigerant pipes are charged with nitrogen gas (N2) instead of R22 before shipment from the factory.
MODEL
SELECT
NOT AVAILABLE
SWING
CHECK
FAN
TEST
RUN
˚F
˚C
AMPMSTOP
START
OC276-A-1.qxp 03.11.25 9:04 AM Page 2

3
PART NAMES AND FUNCTIONS2
●Wireless remote controller
●When cover is open.
ON/OFF TEMP
FAN
VANE
TEST RUN
AUTO STOP
AUTO START
h
min
LOUVER
MODE
CHECK
RESETSET CLOCK
MODEL
SELECT
NOT AVAILABLE
SWING
CHECK
FAN
TEST
RUN
˚F
˚C
AMPMSTOP
START
AMPM
COOL
DRY
AUTO
FAN
HEAT
VANE CONTROL button
Used to change the air flow direction.
CLOCK button
RESET button
SET button
ON/OFF button
The unit is turned ON and OFF alternately
each time the button is pressed.
LOUVER button
This switch the horizontal fan motion ON
and OFF.
(Not available for this model.)
MODE SELECT button
Used to switch the operation mode between
cooling, drying, fan.
CHECK-TEST RUN button
Only press this button to perform an inspec-
tion check or test operation.
Do not use it for normal operation.
FAN SPEED SELECT button
Used to change the fan speed.
TIMER display
Displays when in timer operation or when
setting timer.
button
SET TEMPERATURE button sets any desired
room temperature.
CLOCK display
Displays the current time.
“” “ ” display
Displays the order of timer operation.
“ ” “ ” display
Displays whether timer is on or off.
Buttons used to set the “hour and minute” of
the current time and timer settings.
h and min buttons
88°F display
SET TEMP. display indicates desired temper-
ature set.
display
FAN SPEED display indicates which fan
speed has been selected.
display
The vertical direction of air flow is indicated.
display
Blinks when model is selected.
display
Lights up while transmission to the indoor
unit is mode using switches.
display
CHECK&TEST RUN display indicates that
the unit is being checked or test-run.
OPERATION MODE display
OPERATION MODE display
Operation mode display indicates which op-
eration mode is in effect.
TIMER CONTROL buttons
AUTO STOP (OFF timer): when this switch
is set, the air conditioner will be au-
tomatically stopped at the preset time.
AUTO START (ON timer): when this switch
is set, the air conditioner will be automatical-
ly started at the preset time.
MODEL SELECT
CHECK TEST RUN
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4
3 SPECIFICATIONS
FK1:48 -41
Capacity
Moisture removal
Power
Consumption
EER
SEER
HSPF
COP
INDOOR UNIT MODELS
External finish
Power supply
Max.fuse size (time delay)
Min.ampacity
Fan motor
Booster heater
Airflow Hi-Lo
Sound level Hi-Lo
Unit drain pipe O.D.
Dimensions
Weight
OUTDOOR UNIT MODELS
External finish
Power supply
Max.fuse size (time delay)
Min.ampacity
Fan motor
Compressor
Crankcase heater
Refrigerant control
Defrost method
Sound level
Dimensions
Weight
REMOTE CONTROLLER
Control voltage (by built-in transformer)
REFRIGERANT
REFRIGERANT PIPING
Pipe size
Connection
method
Between the indoor
& outdoor units
Cooling *1
Heating *1
Heating *2
Cooling *1
Heating *1
Heating *2
*1
*1
*2
Dry
Wet
W
D
H
Model (type)
W
D
H
Name
Charge
Oil <Model>
Liquid
Gas
Indoors
Outdoors
Height difference
Piping length
Btu/h
Btu/h
Btu/h
Pints/h
kW
kW
kW
V,phase,Hz
A
A
F.L.A.
A(kW)
CFM
CFM
dB
in.
in.
in.
in.
lb
V,phase,Hz
A
A
F.L.A.
R.L.A.
L.R.A.
A(W)
dB
in.
in.
in.
lb
L
in.
in.
ft
ft
PKH18FL
Model
18,000
18,600[24,100/25,100]
10,700[16,200/17,200]
5.3
1.79
1.56[3.16/3.46]
1.34[2.94/3.24]
10.1
11.1
7.2
3.5
2.3
PKH18FL
57
PUH18EK
20
16
0.75
RH247NAB
12
37
0.11/0.12[23/28]
53
33-1/2
131
5 lbs 8 oz
0.52 <MS-56>
130
130
PKH24FL
24,000
25,000[30,500/31,500]
14,700[20,200/21,200]
7.0
2.36
2.37[3.97/4.27]
1.92[3.52/3.82]
10.2
10.2
6.8
3.1
2.2
PKH24FL
Munsell 3.4Y 7.7/0.8
208/230,1,60
57
PUH24EK1
Munsell 5Y 7/1
208/230,1,60
20
16
0.65+0.65
NH33NBD
11.5
54
0.16/0.17[33/39]
Capillary tube
Reverse cycle
55
49-9/16
202
With indoor unit
Indoor unit-remote controller:DC12V. Indoor unit-outdoor unit:DC12V
R22
9 lbs 15 oz
1.2 <MS32N-1>
Not supplied(optional parts)
Flared
Flared
9-1/4
13-3/8
PKH30FL
30,000
33,000[39,100/40,500]
19,000[25,100/26,500]
9.1
3.12
3.02[4.82/5.22]
2.48[4.28/4.68]
9.6
10.6
7.1
3.2
2.2
PKH30FL
FK1:49-44
66
PUH30EK1
30
20
0.75+0.75
NH41NAD
14.0
73
0.16/0.17[33/39]
55
38-3/16
13-9/16
49-9/16
245
10 lbs 2 oz
1.3 <MS32N-1>
1/2
3/4
PKH36FL
34,200
38,000[44,100/45,500]
19,600[25,700/27,100]
10.5
3.44
3.54[5.34/5.74]
2.65[4.45/4.85]
9.9
10.5
6.9
3.1
2.2
PKH36FL
FK1:50-46
66
PUH36EK1
30
22
0.75+0.75
NH47NAD
17.5
87
0.16/0.17[33/39]
55
38-3/16
13-9/16
49-9/16
246
10 lbs 9 oz
1/2
3/4
164
164
Item
34-1/4
11-5/8
3/8
5/8
164
164
55-1/8 66-5/32
NOTES : *1.Rating conditions (cooling)-indoor : 80˚FDB,67˚FWB outdoor : 95˚FDB,75˚FWB.
(heating)-indoor : 70˚FDB,60˚FWB outdoor : 47˚FDB,43˚FWB.
*2.Rating conditions (heating)-indoor : 70˚FDB,60˚FWB outdoor : 17˚FDB,15˚FWB.
*3.Heating capacity and power consumption in [ ] includes heater operation at 208/230V.
Operating range
Indoor intake air temperature
95˚FDB,71˚FWB
67˚FDB,57˚FWB
80˚FDB,67˚FWB
70˚FDB,60˚FWB
Outdoor intake air temperature
115˚FDB
0˚FDB *
75˚FDB,65˚FWB
17˚FDB,15˚FWB
Cooling
Heating
Maximum
Minimum
Maximum
Minimum
1-1/16 (or 7/8)
15
12 13
0.5 0.6
7.6/8.4[1.6/1.9]
710-530
640-480
8.7/9.6[1.8/2.2]
990-780
890-700
*In case of the wind baffle is installed.
(In case of the wind baffle is not installed, the minimum temperature will be 23˚FDB.)
MODELS : PKH18FL, PKH24FL, PKH30FL, PKH36FL
OC276-A-1.qxp 03.11.25 9:04 AM Page 4

5
DATA
4
Models
Models Outdoor intake air DB temperature(˚F)
PKH18FL
71
67
63
62.5
60
59
71
67
63
62.5
60
59
71
67
63
62.5
60
59
71
67
63
62.5
60
59
TC
21.0
19.5
18.2
18.1
17.2
16.8
27.9
26.1
24.3
24.1
23.0
22.5
34.9
32.6
30.4
30.2
28.8
28.2
39.8
37.1
34.7
34.4
32.8
32.2
SHC
14.4
16.0
17.4
15.5
15.1
14.5
16.1
18.5
20.5
18.0
17.6
17.0
21.5
24.5
26.9
23.8
23.2
22.4
23.0
26.3
29.3
25.8
25.1
24.3
TPC
1.56
1.52
1.49
1.49
1.47
1.46
2.05
2.01
1.97
1.96
1.94
1.93
2.72
2.66
2.60
2.59
2.57
2.56
3.00
2.93
2.87
2.86
2.82
2.81
TC
20.2
18.8
17.5
17.4
16.6
16.2
26.9
25.1
23.4
23.2
22.1
21.7
33.7
31.4
29.2
29.0
27.6
27.0
38.4
35.7
33.3
33.1
31.5
30.8
SHC
13.9
15.4
16.7
14.9
14.5
14.0
15.5
17.8
19.7
17.4
16.9
16.4
20.8
23.6
25.8
22.9
22.2
21.5
22.1
25.3
28.1
24.8
24.1
23.2
TPC
1.69
1.65
1.61
1.61
1.58
1.57
2.23
2.18
2.12
2.12
2.09
2.07
2.95
2.88
2.81
2.80
2.77
2.76
3.25
3.17
3.10
3.09
3.04
3.03
TC
19.4
18.0
16.8
16.6
15.8
15.5
25.8
24.0
22.4
22.2
21.1
20.7
32.3
30.0
27.9
27.7
26.3
25.7
36.8
34.2
31.9
31.6
30.1
29.5
SHC
13.3
14.8
16.0
14.3
13.8
13.4
14.9
17.0
18.9
16.6
16.2
15.6
19.9
22.5
24.6
21.9
21.2
20.4
21.2
24.3
26.9
23.7
23.0
22.3
TPC
1.84
1.79
1.74
1.74
1.70
1.69
2.43
2.36
2.30
2.29
2.25
2.24
3.21
3.12
3.04
3.03
2.99
2.98
3.54
3.44
3.35
3.34
3.28
3.26
TC
18.5
17.1
15.9
15.8
15.0
14.6
24.6
22.9
21.3
21.1
20.1
19.7
30.8
28.6
26.6
26.3
24.9
24.4
35.1
32.6
30.3
30.0
28.5
27.9
SHC
12.7
14.0
15.2
13.6
13.1
12.6
14.2
16.3
18.0
15.8
15.4
14.9
19.0
21.5
23.5
20.7
20.1
19.4
20.2
23.1
25.6
22.5
21.8
21.0
TPC
1.99
1.93
1.88
1.87
1.84
1.83
2.63
2.55
2.47
2.47
2.41
2.39
3.48
3.37
3.27
3.26
3.21
3.19
3.83
3.71
3.61
3.59
3.52
3.50
TC
17.6
16.3
15.1
15.0
14.2
13.9
23.4
21.7
20.1
19.9
18.9
18.5
29.3
27.1
25.1
24.9
23.5
22.9
33.4
30.9
28.7
28.4
26.9
26.4
SHC
12.1
13.4
14.4
12.9
12.4
12.0
13.5
15.4
17.0
14.9
14.5
14.0
18.1
20.3
22.2
19.6
18.9
18.2
19.3
21.9
24.2
21.3
20.6
19.9
TPC
2.15
2.07
2.01
2.00
1.96
1.94
2.84
2.73
2.65
2.64
2.58
2.56
3.75
3.61
3.50
3.49
3.43
3.41
4.13
3.98
3.86
3.85
3.76
3.73
IWB
(˚F)
DB 75°F (50%RH)
DB 72°F (50%RH)
DB 70°F (50%RH)
DB 75°F (50%RH)
DB 72°F (50%RH)
DB 70°F (50%RH)
DB 75°F (50%RH)
DB 72°F (50%RH)
DB 70°F (50%RH)
DB 75°F (50%RH)
DB 72°F (50%RH)
DB 70°F (50%RH)
75 85 95 105 115
710
0.16
Airflow
(CFM)
B.F
PKH24FL 710
0.16
PKH30FL 990
0.15
PKH36FL 990
0.14
Notes 1. B.F. : Bypass Factor, IWB : Intake air wet-bulb temperature
TC : Total Capacity (x103 Btu/h), SHC : Sensible Heat Capacity (x103 Btu/h)
TPC : Total Power Consumption (kW)
2. SHC is based on 80˚FDB of indoor intake air temperature.
3. Cooling capacity correction factors and Refrigerant piping length (one way) range.
MODEL Refrigerant piping length (one way)
1.0
1.0
1.0
1.0
25ft
0.992
0.981
0.981
0.981
40ft
0.983
0.968
0.968
0.968
55ft
0.978
0.952
0.952
0.952
70ft
0.966
0.940
0.940
0.940
85ft
0.959
0.925
0.925
0.925
100ft
0.950
0.913
0.913
0.913
115ft
0.945
0.900
0.900
0.900
130ft
0.886
0.886
0.886
150ft
0.874
0.874
0.874
164ft
PKH18FL
PKH24FL
PKH30FL
PKH36FL
MODELS : PKH18FL, PKH24FL, PKH30FL, PKH36FL
1. PERFORMANCE DATA
1) COOLING CAPACITY
OC276-A-1.qxp 03.11.25 9:04 AM Page 5