Mitsubishi Electric PCH-2GKHA User manual

TECHNICAL & SERVICE MANUAL
SPLIT-TYPE,HEAT PUMP AIR CONDITIONERS
CONTENTS
1. FEATURES ···········································3
2. PART NAMES AND FUNCTIONS ········7
3. SPECIFICATIONS·································8
4. DATA ···················································11
5. OUTLINES AND DIMENSIONS··········15
6. WIRING DIAGRAM·····························2
7.
REFRIGERANT SYSTEM DIAGRAM ······21
8. OPERATION FLOW-CHART··············22
9. MICROPROCESSOR CONTROL·······26
1 . TROUBLESHOOTING ························49
11. DISASSEMBLY PROCEDURE ···········57
12. PARTS LIST········································62
13. OPTIONAL PARTS ·····························73
Indoor unit
PCH-2GKHA PCH-2GKHA1
PCH-2.5GKHA PCH-2.5GKHA1
PCH-3GKHA PCH-3GKHA1
PCH-4GKHSA PCH-4GKHSA1
PCH-5GKHSA PCH-5GKHSA1
PCH-6GKHSA PCH-6GKHSA1
No. OC135
1997
[Models names] [Service Ref.]
This manual does not over the
following outdoor units. When
serving them, please refer to the
servi e manual No.OC128 and
this manual in a set.
[Servi e Ref.]
PUH-2VKA2
PUH-2.5VKA2
PUH-3VKA2
PUH-3YKA2
PUH-4YKSA3
PUH-5YKSA3
PUH-6YKSA2
INDOOR UNIT
Ceiling Suspended
Series PCH
REMOTE CONTROLLER
The Slim Line.
From Mitsubishi Electric.
FILTER
CHECK MODE
TEST RUN

3
● Operation buttons ● On e the operation of the unit is set, subsequent operation an
only be performed by pressing the ON/OFF button repeatedly.
FILTER
CHECK MODE
TEST RUN
4
This swit hes between
ontinuous operation and the
timer operation.
button
This sets the ventilation fan
speed.
button
button
This sets or swit hes the
urrent time. start time and
stop time.
button
This swit hes the horizontal
fan motion ON and OFF.
button
Press this button to swit h
the ooler ele troni dry
(dehumidify) automati and
heater modes.
button
This resets the filter servi e
indi ation display.
FILTER button
This swit hes between the
operation and stop modes
ea h time it is pressed. The
lamp on this butoon lights
during operation.
ON/OFF button
This sets the room
temparature The temparature
setting an be performed in
1°C units
Setting range
Cooler 19°C to 30°C
Heater 17°C to 28°C
TEMP button
This model name of the
remote ontroller is indi ated.
1FEATURES
1. ADVANCED REMOTE CONTROLLER
Indoor unit
Ceiling Suspended
Series PCH
Remote ontroller
FILTER
CHECK MODE
TEST RUN
wRating Conditions (JIS B 8616)
Cooling : Indoor : 27:(80
o
F)DB, 19:(66
o
F)WB.
Outdoor : 35:(95
o
F)DB, 24:(75
o
F)WB.
Heating : Indoor : 20:(68
o
F)DB.
Outdoor : 7:(45
o
F)DB, 6:(43
o
F)WB.
This adjusts the verti al angle
of the ventilation.
(This button dose not operate 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 normal operation.
Cooling capacity/Heating capacity
W Btu/h
Service Ref.
PCH-2GKHA1
PCH-2.5GKHA1
PCH-3GKHA1
PCH-4GKHSA1
PCH-5GKHSA1
PCH-6GKHSA1
5,400 / 6,200 (7,600)
7,000 / 7,100 (9,200)
7,500 / 8,500 (10,600)
10,000 / 10,450 (13,150)
12,400 /13,900 (16,900)
14,500 / 15,000 (18,000)
18,400 / 21,200 (25,900)
23,900 / 24,200 (31,400)
25,600 / 29,000 (36,200)
34,100 / 35,700 (44,900)
42,300 / 47,400 (57,700)
49,500 / 51,200 (61,400)

4
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, button and
TEMP button do not operate.
●“NOT AVAILABLE” is displayed when the kbutton 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.
FILTER
CHECK MODE
TEST RUN
4
CENTRALLY
CONTROLLED display
This indi ates when the unit is
ontrolled by optional features su h
as entral ontrol type remote
ontroller.
display
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
operation is performed.
CHECK display
This indi ates when a malfun tion
has o urred in the unit whi h should
be he ked.
display
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.
●Display
Operation lamp
This lamp lights during operation,
goes off when the unit stops and
flashes when a malfun tion o urs.
display
This lamp lights when ele tri ity is
supplied to the unit.
display
This displays the sele ted setting
temperature.
display
This displays the air dire tion.
display
The temperature of the su tion air is
displayed during operation. The
display range is 8° to 39°C. The
display flashes 8°C when the a tual
temperature is less than 8° and
flashes 39°C when the a tual
temperature is greater than 39°C.
display
This display lights in the he k mode
or when a test operation is
performed.
CHECK MODE
TEST RUN
display
This lamp lights when the filter need
to be leaned.
FILTER
display
The sele ted fan speed is displayed.

5
1. AIR OUTLET
New PCH series models have 1 air outlet (auto vane swit hing of horizontal air flow / down flow by swit hed by auto vane)
instead of 2 (horizontal,and down flows).
2. EASY TO CLEAN ; FLOCKLESS VANE
With our original air urrent ontrol me hanism, a flo kless vane is
newly adapted.
The flo kless vane prevents the ondensation on the vane.
By hanging the vane to the flo kless type, the unit an be leaned
mu h easier with mild household detergent.
3. NEW MATERIALS FOR BETTER OIL RESISTANCE
We have hanged the materials of grill, filer, fan and fan asing from ABS to P.P. (polypropylene) for better oil
resistan e. As a result, oil razing is ut in haif.
4. SIMPLIFIED INSTALLATION WORK (DIRECT SUSPENDING METHOD)
Simplified the installation work by hanging the suspending method to the dire t suspending method (suspending
the unit dire tly from the suspension fixture).
In this way, the unit an be atta hed to the suspension fixture without removing the installation parts off (Only the
side over is removed). This method is mu h simpler than the “One-time installation method”.
5. IMPROVING EFFICIENCY OF PIPING WORK
1Removed the kno kout work by separating the piping
spa e from the air outlet for effi ien y of the piping work.
wKno kout work is needed for the top part. When
optional drain-up ma hine is installed, the refrigerant
pipe exits out from the top.
wPlease move the rubber plug for the unit to the right joint
when drainage pipe exits from the left side.
2Improved the flexbility by making it possible for
drainage pipe to exit not only from the right side
ba k but also from the left side ba k.
Unifies the air speed
with the vane.
Sending the air to the upper
area of the vane
Prevents the air omes from
ntering from outside the unit
Protruding portion A
Protruding portion B
Flo kless vane
Air outlet
B
A
Ba k panel
U- ut
Side panel
L : Liquid pipe
G : Gas pipe
D : Drain pipe
LL
G
D
D
G
open
open
Drain pan Rubber plug
Insulation over
(atta hed)
Drain pipe
(pur hased lo ally)
Band
(atta hed)
Insulation
over
Joint oupliy
(atta hed)

6
6. QUITENESS ; 43dB (HIGH NOTCH)
New PCH series has No.1 quietness by hanging the air ourse and the adapting the new shape air outlet.
7. EASY MAINTENANCE ; NO MAINTENANCE NECESSARY FOR 25 HOURS
The new longlife air filter an be used ontinuously 2500 hours without maintenan e (at general offi e situation).
8. CHOICE OF FILTER
High performan e filter an be pur ha ed optionally for the spe ial needs.
Auto vane
Swing
Locations Appropriate filter Capability Filter life Maintenance How to attach to the unit
Busy
shops et ...
Regular
offi e, shops
High performan e filter
Standard longlife filter
2500 hour
2500 hour
The filter an
be used again
after leaning.
The filter an
be used again
after leaning.
Remove the standard long life
filter before atta h this optional
parts.
It is atta hed to the unit.
Weighing
method 70%
Weighing
method 30%

7
PART NAMES AND FUNCTION
2
● Indoor (Main) Unit
Air outlet
Intake grille Air intake
Left/right guide vanes
Change the dire tion of airflow
from the horizontal blower.
Long-life fillter
Removes dust and foreigh matter from air oming in
through the grille (Re ommended leaning interval :
Approx, every 2,500 operating hours)
Up/down guide vanes
Change the dire tion of airflow from the
varti al blower.

Service Ref.
Power supply
External finish
Heat ex hanger
Booster heater
Operation ontrol & Thermostat
Noise level(Low-High)
Cond. drain onne tion O.D.
Dimensions
Weight
Service Ref.
Power supply
External finish
Refrigerant ontrol
Compressor
Heat ex hanger
Defrost method
Crank ase heater
Noise level
Dimensions
Weight
Refrigerant
Pipe size O.D.
Conne tion method
Between the indoor & outdoor unit
Indoor side
Outdoor side
Height differen e
Piping length
Input
Running urrent
Starting urrent
Fan(drive))No.
Fan motor output
Airflow(Low-High)
External stati pressure
Input
Running urrent
Starting urrent
Model
Motor output
Starter type
Prote tion devi es
Fan(drive))No.
Fan motor output
Airflow
Charge
dB(A)
mm,(in)
mm,(in)
mm,(in)
mm,(in)
kg,(lbs)
W
D
H
Fun tion
Total input
Capa ity
Cooling
Heating
Upper limit
Lower limit
Upper limit
Lower limit
Indoor
35: DB, 22.5: WB
21: DB, 15.5: WB
27: DB
20: DB
Outdoor
46: DB
-5: DB
21: DB, 15.5: WB
-8.5: DB, -9.5: WB
2. Guaranteed operating range
W
dB(A)
mm,(in)
mm,(in)
mm,(in)
kg,(lbs)
W
D
H
INDOOR UNITOUTDOOR UNIT
REFRIGERANT
PIPING
Item Service Ref.
Btu/h
W
kW
kW
A
A
kW
A
A
kW
kg,(lbs)
kW
K/min <CFM>
kW
K/min <CFM>
Pa(mmAq)
kW
mm,(in)
mm,(in)
Liquid
Gas
PCH-2GKHA1PCH-2.5GKHA1
Cooling
18,400
5,400
2.30
0.10
0.43
1.20
0.10 (1.50)
0.43(6.21)
1.20 (6.98)
0.13
0.55
1.27
0.13 (2.23)
0.55 (9.30)
1.27 (10.02)
Heating
21,200 (25,900)
6,200 (7,600)
2.32 (3.72)
Cooling
23,900
7,000
2.59
Heating
24,200 (31,400)
7,100 (9,200)
2.36 (4.46)
PCH-2GKHA1
Single phase. 50Hz. 220-240V
Munsell 0.70Y 8.59 / 0.97
Plate fin oil
PCH-2.5GKHA1
Siro o (dire t))2
0.054
10 -13 <353-459>
Siro o (dire t))3
0.07
14 -18 <494-635>
0 (dire t blow)
(1.4) (2.1)
Remote ontroller & built-in
37 - 42 37 - 43
26(1)
1,000 (39-3/8) 1,310 (51-9/16)
680 (26-3/4)
210 (8-1/4)
28.5 (63)
PUH-2VKA2
36 (79)
PUH-2.5VKA2
NH38VMD
1.7
NH41VMD
2.0
0.065
45 (1,590)
0.085
50 (1,764)
650 (25-5/8)
64 (141)
850 (33-7/16)
68 (150)
Max. 40m
Max. 40m
Max. 50m
Max. 50m
49 52
2.2 (4.9) 2.8 (6.2)
Single phase. 50Hz. 220-240V
Reverse y le
38
R-22
870 (34-1/4)
295 + 24 (11-5/8 add 1)
Munsell 5Y 7/1
Capillary tube
Hermeti
Line start
Internal thermostat. High-pressure swit h
Plate fin oil
Propeller (dire t)✕1
2.20
9.86
45
2.22
9.95
45
2.46
10.68
52
2.23
9.78
52
9.52 (3/8)
15.88 (5/8)
Flared
Flared
8
SPECIFICATIONS
3
Rating Conditions (JIS B8616)
Notes1. Rating Conditions (JIS B8616)
Cooling : Indoor : 27:(80oF)DB. 19:(66oF)WB
Outdoor : 35:(95oF)DB. 24:(75oF)WB
Heating : Indoor : 20:(68oF)DB.
Outdoor : 7:(45oF)DB. 6:(43oF)WB
Refrigerant piping length (one way) : 5m(16ft)
3. Above data based on indi ated voltage
Indoor Unit 1 phase 240V 50Hz
Outdoor Unit 1 phase 240V 50Hz

9
Rating Conditions (JIS B8616)
Service Ref.
Power supply
External finish
Heat ex hanger
Booster heater
Operation ontrol & Thermostat
Noise level(Low-High)
Cond. drain onne tion O.D.
Dimensions
Weight
Service Ref.
Power supply
External finish
Refrigerant ontrol
Compressor
Heat ex hanger
Defrost method
Crank ase heater
Noise level
Dimensions
Weight
Refrigerant
Pipe size O.D.
Conne tion method
Between the indoor & outdoor unit
Indoor side
Outdoor side
Height differen e
Piping length
Input
Running urrent
Starting urrent
Fan(drive))No.
Fan motor output
Airflow(Low-High)
External stati pressure
Input
Running urrent
Starting urrent
Model
Motor output
Starter type
Prote tion devi es
Fan(drive))No.
Fan motor output
Airflow
Charge
dB(A)
mm,(in)
mm,(in)
mm,(in)
mm,(in)
kg,(lbs)
W
D
H
Fun tion
Total input
Capa ity
Cooling
Heating
Upper limit
Lower limit
Upper limit
Lower limit
Indoor
35: DB, 22.5: WB
21: DB, 15.5: WB
27: DB
20: DB
Outdoor
46: DB
-5: DB
21: DB, 15.5: WB
-8.5: DB, -9.5: WB
2. Guaranteed operating range
W
dB(A)
mm,(in)
mm,(in)
mm,(in)
kg,(lbs)
W
D
H
INDOOR UNITOUTDOOR UNIT
REFRIGERANT
PIPING
Item Service Ref.
Btu/h
W
kW
kW
A
A
kW
A
A
kW
kg,(lbs)
kW
K/min <CFM>
kW
K/min <CFM>
Pa(mmAq)
kW
mm,(in)
mm,(in)
Liquid
Gas
PCH-3GKHA1PCH-4GKHSA1
Cooling
25,600
7,500
3.28
0.13
0.55
1.27
0.13 (2.23)
0.55 (9.30)
1.27 (10.02)
0.16
0.70
1.48
0.16 (2.86)
0.70 (11.95)
1.48 (12.73)
Heating
29,000 (36,200)
8,500 (10,600)
3.07 (5.17)
Cooling
34,100
10,000
3.36
Heating
35,700 (44,900)
10,450 (13,150)
3.35(6.05)
PCH-3GKHA1
Single phase. 50Hz. 220-240V
Munsell 0.70Y 8.59 / 0.97
Plate fin oil
Siro o (dire t) ✕ 3
PCH-4GKHSA1
0.07
14 -18 <494-635>
0.09
20 -25 <706-883>
0 (dire t blow)
(2.1)
210 (8-1/4) 270 (10-5/8)
(2.7)
Remote ontroller & built-in
37 - 43 40 - 45
26 (1)
1,310 ( 51-9/16 )
680 (26-3/4)
36 (79)
PUH-3VKA2,PUH-3YKA2
39.5 (87)
PUH-4YKSA3
NH52VND(PUH-3VKA),NH52YDA(PUH-3YKA)
2.2 / 2.4
NH56YDA
2.7
Propeller (dire t) ✕ 1
0.085
50 (1,764)
Propeller (dire t) ✕ 2
0.065 + 0.065
95 (3,350)
850 (33-7/16)
75 (165)
1,258 (49-1/2)
94 (207)
Max. 50m
Max. 50m
38
52
38
54
3.2 (7.1)
9.52 (3/8)
15.88 (5/8)
4.2 (9.2)
9.52 (3/8)
19.05 (3/4)
VKA...1phase, 50Hz, 220-240V / YK(S)A...3phase, 50-380Hz, 415V, 4wires
Reverse y le
R-22
870 <34-1/4>
295 + 24 <11-5/8 add 1>
Munsell 5Y 7/1
Capillary tube
Hermeti
Line start
VKA...Inner thermostat. High-pressure swit h YKA...Anti-phase prote tor, Thermal relay, Thermal swit h, High-pressute swit h
Plate fin oil
3.15
13.82 / 5.16
58 / 37
2.94
12.89 / 4.81
58 / 37
3.20
5.24
40
3.19
5.22
40
Flared
Flared
Notes1. Rating Conditions (JIS B8616)
Cooling : Indoor : 27:(80oF)DB. 19:(66oF)WB
Outdoor : 35:(95oF)DB. 24:(75oF)WB
Heating : Indoor : 20:(68oF)
Outdoor : 7:(45oF)DB. 6:(43oF)WB.
Refrigerant piping length (one way) : 5m(16ft)
3. Above data based on indi ated voltage
Indoor Unit 1 phase 240V 50Hz
Outdoor Unit 1 phase 240V 50Hz / 3 phase 415V 50Hz

10
Rating Conditions (JIS B8616)
Service Ref.
Power supply
External finish
Heat ex hanger
Booster heater
Operation ontrol & Thermostat
Noise level(Low-High)
Cond. drain onne tion O.D.
Dimensions
Weight
Service Ref.
Power supply
External finish
Refrigerant ontrol
Compressor
Heat ex hanger
Defrost method
Crank ase heater
Noise level
Dimensions
Weight
Refrigerant
Pipe size O.D.
Conne tion method
Between the indoor & outdoor unit
Indoor side
Outdoor side
Height differen e
Piping length
Input
Running urrent
Starting urrent
Fan(drive))No.
Fan motor output
Airflow(Low-High)
External stati pressure
Input
Running urrent
Starting urrent
Model
Motor output
Starter type
Prote tion devi es
Fan(drive))No.
Fan motor output
Airflow
Charge
dB(A)
mm,(in)
mm,(in)
mm,(in)
mm,(in)
kg,(lbs)
W
D
H
Fun tion
Total input
Capa ity
Cooling
Heating
Upper limit
Lower limit
Upper limit
Lower limit
Indoor
35: DB, 22.5: WB
21: DB, 15.5: WB
27: DB
20: DB
Outdoor
46: DB
-5: DB
21: DB, 15.5: WB
-8.5: DB, -9.5: WB
2. Guaranteed operating range
W
dB(A)
mm,(in)
mm,(in)
mm,(in)
kg,(lbs)
W
D
H
INDOOR UNITOUTDOOR UNIT
REFRIGERANT
PIPING
Item Service Ref.
Btu/h
W
kW
kW
A
A
kW
A
A
kW
kg,(lbs)
kW
K/min <CFM>
kW
K/min <CFM>
Pa(mmAq)
kW
mm,(in)
mm,(in)
Liquid
Gas
PCH-5GKHSA1PCH-6GKHSA1
Cooling
42,300
12,400
4.45
0.24
1.06
2.20
0.24 (3.24)
1.06 (13.56)
2.20 (14.70)
0.24
1.06
2.20
0.24 (3.24)
1.06 (13.56)
2.20 (14.70)
Heating
47,400 (57,700)
13,900 (16,900)
4.40 (7.40)
Cooling
49,500
14,500
4.97
Heating
51,200 (61,400)
15,000 (18,000)
4.82 (7.82)
PCH-5GKHSA1
Single phase. 50Hz. 220-240V
PCH-6GKHSA1
Munsell 0.70Y 8.59 / 0.97
Plate fin oil
Siro o (dire t)✕4
0.15
27 -34 <953-1,200>
0 (dire t blow)
(3.0)
Remote ontroller & built-in
41-46 42-48
26 (1)
1,620 (63-3/4)
680 (26-3/4)
270 (10-5/8)
46 (101)
PUH-5YKSA3
48 (106)
PUH-6YKSA2
ZR61KC-TFD
3.5
ZR68KC-TFD
4.0
0.085 + 0.085
95 (3,350)
0.10 + 0.10
100 (3,530)
114 (251) 117 (258)
55 56
5.4 (11.9) 5.0 (11.0)
3 phases. 50Hz. 380-415V (4 wires)
Reverse y le
38
R-22
970 (38-3/16)
345 + 24 (13-9/16 add 1)
1,258 (49-1/2)
Munsell 5Y 7/1
Capillary tube
Hermeti
Line start
Anti-phase prote tor, Internal thermostat, Thermal swit h, High-pressure swit h
Plate fin oil
Propeller (dire t)✕2
4.21
6.89
53
4.16
6.81
53
4.73
7.74
74
4.58
7.50
74
9.52 (3/8)
19.05 (3/4)
Flared
Flared
Max. 50m
Max. 50m
Notes1. Rating Conditions (JIS B8616)
Cooling : Indoor : 27:(80oF)DB. 19:(66oF)WB
Outdoor : 35:(95oF)DB. 24:(75oF)WB
Heating : Indoor : 20:(68oF)DB.
Outdoor : 7:(45oF)DB. 6:(43oF)WB.
Refrigerant piping length (one way) : 5m(16ft)
3. Above data based on indi ated voltage
Indoor Unit 1 phase 240V 50Hz
Outdoor Unit 3 phase 415V 50Hz