Mitsubishi Electric PUMY-P36NHMU Operating manual

TECHNICAL & SERVICE MANUAL
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
CONTENTS
1. TECHNICAL CHANGES...................................2
2. SAFETY PRECAUTION....................................5
3. OVERVIEW OF UNITS...................................... 8
4. SPECIFICATIONS...........................................10
5. DATA................................................................12
6. OUTLINES AND DIMENSIONS......................18
7. WIRING DIAGRAM.........................................20
8.
NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION..... 24
9. TROUBLESHOOTING.................................... 34
10. ELECTRICAL WIRING....................................81
11. REFRIGERANT PIPING TASKS.....................84
12. DISASSEMBLY PROCEDURE........................88
13. PARTS LIST..................................................... 93
14. RoHS PARTS LIST..........................................96
15. OPTIONAL PARTS..........................................99
OUTDOOR UNIT
No. OC366
REVISED EDITION-C
[Model name]
(Standard type)
PUMY-P36NHMU
PUMY-P48NHMU
(Salt proof type)
PUMY-P36NHMU-BS
PUMY-P48NHMU-BS
HFC
utilized
R410A
Model name
indication
July 2008
NOTE :
· This service manual describes technical data of out-
door unit.
As for indoor units, refer to its service manual.
· RoHS compliant products have <G> mark on the spec
name plate.
[Service Ref.]
PUMY-P36NHMU
PUMY-P48NHMU
PUMY-P48NHMU1
PUMY-P48NHMU2
PUMY-P36NHMU-BS
PUMY-P48NHMU-BS
PUMY-P48NHMU1-BS
PUMY-P48NHMU2-BS
Revision:
• 9. TROUBLESHOOING
has been modified.
• Tester check point is added
(PCB, FAN MOTOR).
• Please void OC366
REVISED EDITION-B.

2
PUMY-P48NHMU1PUMY-P48NHMU2
PUMY-P48NHMU1-BS PUMY-P48NHMU2-BS
· Compressor (MC) and oil have been changed.
ANB33FDCMT (Ester oil: MEL56) ANB33FDHMT(Ether oil: FV50S)
· Electrical parts have been changed.
Multi controller board (MULTI. C.B.) Noise filter circuit board (N.F.)
Active filter module (ACTM) Relay (52C) , Resister (RS) (including N.F.)
PUMY-P48NHMU PUMY-P48NHMU1
PUMY-P48NHMU-BS PUMY-P48NHMU1-BS
• Primary heating ON/OFF control has been added.
1TECHNICAL CHANGES
(1) Primary heating operation controls another heat source that depends on the main system's operations,
which means the interlock operation shown in "c)" will be possible.
a)
b) Note: Following Indoor models DO NOT HAVE this feature available:
PMFY-P06NBMU PMFY-P12NBMU PKFY-P06NAMU
PMFY-P08NBMU PMFY-P15NBMU PKFY-P08NAMU
c) Different Indoor unit applications that can be applied:
(2) Outdoor unit DIPSW4-4 for Primary Heating Control:
Set DIPSW4-4 when power is turned off at unit.
OFF: Disable Primary Heating Function (Initial setting)
ON : Enable Primary Heating Function
(3) Determine required Indoor Fans Speed during defrost mode:
0 20k 27k 39k 62K
None Black Blue White Red
Stopped Setting on remote
controller Very Low Low High
Note: The setting will be disabled "when Heater contact signal is OFF".
Service ref. PUMY-P48NHMU(-BS) does not have this function.
Indoor unit must be R410A UL model for this function to operate.
CN22 input resistance ()
CN22 input (cable color)
FAN SPEED SETTING
OFF
Fan airflow rate setting
During defrost operation ON Wiring
CN22
1-1. PRIMARY HEATING ON/OFF CONTROL SET-UP
a) With no Primary heating output the Indoor fan normally goes off to prevent cold drafts during the defrost cycles.
b) With Primary heating control the auxiliary heat will be on during defrost mode, thus cold drafts will not be present.
(Ducted units only)
c) For models PEFY and PDFY (Ducted) recommended to use "Black" (20K) connector.
d) For models PLFY, PCFY, PKFY and PFFY (Ductless) recommended "None", no connector required.
e) To set the fan airflow rate to be used during defrost operation, insert the resistance that is packed within the
optional adaptor cable kit (PAC-YU24HT-F) into the CN22 sensor input.
You can choose at what speed the indoor fan operates during defrost cycles bases on chart below.

3
(4) Determine Fan Airflow setting during Indoor Thermo OFF conditions:
a) These settings are done within Indoor DIPSW1-7 and DIPSW1-8, see chart below for options.
b) Recommended SW1-7 OFF and SW1-8 ON will determine airflow based on "Setting on the remote controller".
Fan speed
setting Fan speed setting
OFF ON
SW1-7 SW1-8
OFF OFF Very low
ON OFF Low
OFF ON Setting on
remote
controller
ON
ON
Stopped
(5) Setting Outdoor unit and Auxiliary heat switch over temperatures.
When the DIPSW 4-4 is set to "ON", the outdoor unit and the contact output operates as shown below.
a) Outdoor default setting and operations are shown below:
Stage 1
A
mb. Decreasing - Outdoor unit HP operation
Amb. Incareasing - Defrost : Heater contact ON signal
- Other than defrost : Contact OFF
Stage 2
- Outdoor unit HP operation
- Heater contact ON signal
Stage 3
- Outdoor unit OFF (Standby)
- Heater contact ON signal
TH7 = Outdoor Temperature
a
-12:
[10F]
When the set temperature ranges overlap, the previously set pattern (1,2 or 3) has a priority.
The stage 1 has the highest priority, 2 the second and then 3.
b) Based on above chart listed the sequence of operation on "On Ambient Decrease"
Stage 1 :(TH7 = > 10
: ) : the Outdoor unit runs in HP mode.
Stage 2 :(TH7 = 10
: to -12 : ) : the Outdoor unit runs in HP mode withAuxiliary heating.
Stage 3 :(TH7 = < -12
: ) : Auxiliary heating only (Outdoor unit is OFF).
c) Based on above chart listed the sequence of operation on " On Ambient Increase"
Auxiliary Heating
Signal
Thermo Condition
Setting on
remote controller
b
0:
[32F]
c
10:
[50F]
d
20:
[68F]
Stage 3 :(TH7 = < 0
: ) : Auxiliary heating only (Outdoor unit is OFF).
Stage 2 :(TH7 = > 0
: to 20 : ) : Auxiliary heating with Outdoor unit in HP mode.
Stage 1 :(TH7 = > 20
: ) : Outdoor unit in HP mode only.

4
(6) Locally procured wiring
A basic connection method is shown.
(i.e. interlocked operation with the electric heater with the fan speed setting on high
Recommended circuit
CN24
CN22
X
+
X
Remote control Board Relay circuit Adapter Indoor unit
control board Outdoor unit control board
Electric Heater power source
Electric
Heater
Red 1
White 2
Dip switch
SW4-4 "ON"
Preparations in the field Maximum cable length
is 10 m (32ft)
Red 1
Red 2
YellowGreen
FS1
FS2
FS1
FS2
R
S
R
S
CN24
H2
88H
H1
88H
26H
88H
1-phase power
supply
208V, 230V/60Hz
Control board
FS1, 2 ----- Thermal fuse
H1, H2 ----- Heater
26H--------- Overheat protection
thermostat
88H--------- Electromagnetic contactor
Wiring digram
For relay X use the specifications given below Operation coil
Rated voltage : 12VDC
Power consumption :0.9W or less
*Use the diode that is recommended by the relay manufacturer at both ends of the relay coil.
The length of the electrical wiring for the PAC-YU24HT is 2 meters (6-1/2 ft)
To extend this length, use sheathed 2-core cable.
Control cable type : CVV, CVS, CPEV or equivalent.
Cable size : 0.5 mm2~ 1.25 mm2(AWG22 to AWG16)
Don`t extend the cable more than 10 meters (32ft).

5
[1] Cautions for service
(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
[2] Additional refrigerant charge
When charging directly from cylinder
· Check that cylinder for R410A on the market is syphon type.
· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
2 SAFETY PRECAUTION
Cautions for units utilizing refrigerant R410A
2-1. CAUTIONS RELATED TO NEW REFRIGERANT
Use new refrigerant pipes.
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contamination
such as sulfur hazardous for use, oxides, dirt,
shaving particles, etc.
In addition, use pipes with specified thickness.
Store the piping to be used during installation
indoors and keep both ends of the piping sealed
until just before brazing. (Leave elbow joints, etc.
in their packaging.)
Use ester oil, ether oil or alkylbenzene oil (small
amount) as the refrigerant oil applied to flares
and flange connections.
Avoid using thin pipes.
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency will be
lowered.
Do not use refrigerant other than R410A.
If other refrigerant (R22 etc.) is used, chlorine in refrige-
rant can cause deterioration of refrigerant oil etc.
Use a vacuum pump with a reverse flow check
valve.
Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil etc.
Use the following tools specifically designed for
use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant.
Keep the tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigera-
nt will change and the efficiency will be lowered.
Flare tool
Electronic refrigerant
charging scale
Vacuum pump adaptor
Size adjustment gauge
Gauge manifold
Torque wrench
Gas leak detector
Charge hose
Tools for R410A
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil etc.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
If large amount of mineral oil enters, that can cause deterio-
ration of refrigerant oil etc.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.

6
Gravimeter
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
No. Tool name Specifications
1Gauge manifold ·Only for R410A
·Use the existing fitting specifications.
·Use high-tension side pressure of 5.3MPa·G or over.
2Charge hose ·Only for R410A
·Use pressure performance of 5.09MPa·G or over.
3Electronic scale
4Gas leak detector ·Use the detector for R134a, R407C or R410A.
5Adaptor for reverse flow check ·Attach on vacuum pump.
6Refrigerant charge base
7Refrigerant cylinder ·Only for R410A ·Top of cylinder (Pink)
·Cylinder with syphon
8Refrigerant recovery equipment
2-2. PRECAUTIONS FOR SALT PROOF TYPE "-BS" MODEL
Although "-BS" model has been designed to be resistant to salt damage, observe the following precautions to maintain the
performance of the unit.
1. Avoid installing the unit in a location where it will be exposed directly to seawater or sea breeze.
2. If the cover panel may become covered with salt, be sure to install the unit in a location where the salt will be washed away
by rainwater. (If a sunshade is installed, rainwater may not clean the panel.)
3. To ensure that water does not collect in the base of the outdoor unit, make sure that the base is level, not at angle. Water
collecting in the base of the outdoor unit could cause rust.
4. If the unit is installed in a coastal area, clean the unit with water regularly to remove any salt build-up.
5. If the unit is damaged during installation or maintenance, be sure to repair it.
6. Be sure to check the condition of the unit regularly.
7. Be sure to install the unit in a location with good drainage.

7
2-3. Cautions for refrigerant piping work
New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is
same as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the
working pressure of R410A is 1.6 time higher than that of R22, their sizes of flared sections and flare nuts are different.
1Thickness of pipes
Because the working pressure of R410A is higher compared to R22, be sure to use refrigerant piping with thickness
shown below. (Never use pipes of 0.7mm [7/256 inch] or below.)
2Dimensions of flare cutting and flare nut
The component molecules in HFC refrigerant are smaller compared to conventional refrigerants. In addition to that,
R410A is a refrigerant, which has higher risk of leakage because its working pressure is higher than that of other
refrigerants. Therefore, to enhance airtightness and intensity, flare cutting dimension of copper pipe for R410A have
been specified separately from the dimensions for other refrigerants as shown below. The dimension B of flare nut for
R410A also have partly been changed to increase intensity as shown below. Set copper pipe correctly referring to
copper pipe flaring dimensions for R410A below. For 1/2 and 5/8 inch, the dimension B changes.
Use torque wrench corresponding to each dimension.
3Tools for R410A (The following table shows whether conventional tools can be used or not.)
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
0.8 [1/32]
0.8 [1/32]
0.8 [1/32]
1.0 [5/128]
—
0.8 [1/32]
0.8 [1/32]
0.8 [1/32]
1.0 [5/128]
1.0 [5/128]
Nominal
dimensions[inch]
Diagram below: Piping diameter and thickness
Outside
diameter (mm)
Thickness (mm) [inch]
R410A R22
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
9.1 [11/32-23/64]
13.2 [1/2-33/64]
16.6 [41/64-21/32]
19.7 [49/64-25/32]
—
9.0
13.0
16.2
19.4
23.3
Nominal
dimensions[inch]
Flare cutting dimensions
Outside
diameter Dimension A ( )
+0
-0.4
(mm) [inch]
R410A R22 1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
17.0 [43/64]
22.0 [7/8]
26.0 [1-3/64]
29.0 [1-9/64]
—
17.0
22.0
24.0
27.0
36.0
Nominal
dimensions[inch]
Flare nut dimensions Outside
diameter[inch] Dimension B
(mm) [inch]
R410A R22
Gauge manifold
Charge hose
Gas leak detector
Refrigerant recovery equipment
Refrigerant cylinder
Applied oil
Safety charger
Charge valve
Vacuum pump
Flare tool
Bender
Pipe cutter
Welder and nitrogen gas cylinder
Refrigerant charging scale
Vacuum gauge or thermis-
tor vacuum gauge and
vacuum valve
Charging cylinder
Air purge, refrigerant charge
and operation check
Gas leak check
Refrigerant recovery
Refrigerant charge
Apply to flared section
Prevent compressor malfunction
when charging refrigerant by
spraying liquid refrigerant
Prevent gas from blowing out
when detaching charge hose
Vacuum drying and air
purge
Flaring work of piping
Bend the pipes
Cut the pipes
Weld the pipes
Refrigerant charge
Check the degree of vacuum. (Vacuum
valve prevents back flow of oil and refri-
gerant to thermistor vacuum gauge)
Refrigerant charge
Tool exclusive for R410A
Tool exclusive for R410A
Tool for HFC refrigerant
Tool exclusive for R410A
Tool exclusive for R410A
Ester oil, ether oil and
alkylbenzene oil (minimum amount)
Tool exclusive for R410A
Tool exclusive for R410A
Tools for other refrigerants can
be used if equipped with adop-
ter for reverse flow check
Tools for other refrigerants
can be used by adjusting
flaring dimension
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants
can be used
Tool exclusive for R410A
Tools and materials Use R410A tools Can R22 tools be used?
(Usable if equipped
with adopter for rever-
se flow)
(Usable by adjusting
flaring dimension)
Can R407C tools be used?
Ester oil, ether oil:
Alkylbenzene oil: minimum amount
(Usable if equipped
with adopter for rever-
se flow)
(Usable by adjusting
flaring dimension)
: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.)
: Tools for other refrigerants can be used under certain conditions.
: Tools for other refrigerants can be used.
Dimension A
Dimension B

8
3 OVERVIEW OF UNITS
3-1. UNIT CONSTRUCTION
Decorative panel
Model Ceiling
Ceiling
Ceiling Conceald mounted Wall Mounted
Concealed
4-way flow
2-way flow 1-way flow
built-in Exposed Cocealed
(Fresh Air)*1
PLFY-P PLFY-P PMFY-P PEFY-P PDFY-P PKFY-P PCFY-P PFFY-P PEFY-P
Capacity
NCMU-E NBMU-E NLMU-E NBMU-E NMLU-E NMHU-E NMSU-E NMU-E NAMU-E NGMU-E NFMU-E NGMU-E NEMU-E NRMU-E NMHU-E-F
06
08
12
15
18
24
27
30
36
48
54
Ceiling Casette
Ceiling
Supended
Floor Standing
Remote
controller
Name
Model number
Functions
M-NET remote controller
PAR-F27MEA-US
• A handy remote controller for use in conjunction
with the Melans centralized management system.
• Addresses must be set.
• Address setting is not necessary.
MA remote controller
PAR-21MAA
Outdoor unit
Capacity
50% ~130% of outdoor unit capacity
Type 06 ~ Type 54
1~ 8 unit
Indoor unit that
can be connected
Number of units
Total system wide capacity
P48
Type 06 ~ Type 36
1~ 6 unit
P36
Branching pipe
components Branch header (2 branches) Branch header (4 branches) Branch header (8 branches)
CMY-Y62-G-E CMY-Y64-G-E CMY-Y68-G-E
*1. It is possible only by 1:1 system.
(1 indoor unit of Fresh Air type is connected with 1 outdoor unit.)
Operating temperature range (outdoor temperature) for fresh air type indoor units differ from other indoor units.
Refer to 3-2(2).

9
3-2. UNIT SPECIFICATIONS
(1) Method for identifying MULTI-S model
■Indoor unit < When using Model 30 > ■Outdoor unit <When using model 48 >
(2) Operating temperature range
Notes D.B. : Dry Bulb Temperature
W.B. : Wet Bulb Temperature
*1. 10~46°C DB[50~115°FDB] : In case of connecting PKFY-P06/P08 type indoor unit.
P L F Y - P 30 N B M U - E PU M Y - P 48 N H M U -BS
PAC type
Frequency
conversion
controller
Refrigerant
R410A/R22
commonness
Refrigerant
R410A
NEW frequency converter
one-to-many air conditioners
(flexible design type)
Indicates equivalent
to Cooling capacity
Indicates equivalent
to Cooling capacity
Power supply
N: Single phase
208/230V 60Hz
Power supply
N: Single phase
208/230V 60Hz
L : Ceiling cassette
K : Wall-mounted type
E : Hidden skylight type
C: Ceiling suspended type
M: Ceiling cassette type
F : Floor standing type
Outdoor unit
model type
Sub-number
Unit model type
UL model
M-NET control
M-NET control
UL model
Salt proof
type
Frequency
conversion
controller
Outdoor unit
MULTI-S
Cooling
W.B. 15~24°C [59~75°F]
Heating
D.B. 15~27°C [59~81°F]
W.B. -18~15°C [0~60°F]
Indoor-side intake air temperature
Outdoor-side intake air temperature D.B. -5~46°C [23~115°F]*1
(3) Guaranteed voltage
198~253V, 60Hz
■In case of connecting fresh air type indoor unit
air type indoor
Capacity of Fresh
Cooling Heating
Indoor-side and Outdoor-side P30 D.B.21~43[70~109°F] *2
W.B.15.5~35[60~95°F] D.B.-10~20[14~68°F] *3
intake air temperature P54 D.B.21~43[70~109°F] *2
W.B.15.5~35[60~95°F] D.B.-5~20[23~68°F] *3
*2.Thermo-off(FAN-mode) automatically starts if the outdoor temp. is lower than 21D.B.[70°FD.B.].
*3.Thermo-off(FAN-mode) automatically starts if the outdoor temp. is higher than 20D.B.[68°FD.B.].

10
4 SPECIFICATIONS
PUMY-P36NHMU(-BS)
Cooling Capacity Btu/h
*3
*3
*3
*3
*3
*3
*3
*3
36,000
Heating Capacity Btu/h
Btu/h/W
W/W
40,000
3.22
14.23/15.74
98.4
2.93
12.88/14.24
98.9
11.18
4.00
Input (Cool)kW
Input Current (Cool)
Power factor (Cool) A
%
%
Input (Heat)kW
Input Current (Heat)
Power factor (Heat) A
EER (Cool)
COP (Heat)
Connectable indoor units (Max.)6
Max. Connectable Capacity Btu/h 46,800(130%)
Power Supply Single phase ,60Hz ,208/230V
Breaker Size
Min.Circuit.Ampacity
Max. fuse size 30A 40A
26A
Sound level (Cool/Heat)dB 49 / 51
External finish Munsell 3Y 7.8/1.1
Refrigerant control Linear Expansion Valve
Compressor Hermetic
ANB33FDHMT
Model
Motor output kW 2.2
Starting method Inverter
Crankcase heater W —
Heat exchanger Plate fin coil (Anti corrosion fin treatment)
Fan Fan(drive)%No. Propeller fan %2
Fan motor output kW 0.086 + 0.086
Airflow m3/min [CFM] 100 [3,530]
Dimensions (HxWxD)Wmm
[in.]950 [37-13/32]
Dmm
[in.]330+30 [13+1-3/16)
Hmm
[in.]1,350 [53-5/32]
Weight kg [lbs]130 [287]
Refrigerant R410A
Charge kg [lbs]8.5 [18.7]
Protection High pressure protection HP switch
devices Compressor protection Discharge thermo,Over current detection
Fan motor protection Overheating/Voltage protection
Oil (Model)2.3 [73] (FV50S)
Total Piping length (Max.)m [ft]
L [oz]
120 [394]
Farthest m [ft] 80 [262]
Max Height difference m [ft] 30 [100]*1
Chargeless length m [ft] 50 [165]
Piping diameter Liquid :mm[inch] 9.52 [3/8]
Gas :mm[inch] 15.88 [5/8]
Guranteed operation range (cool)-5~ 46DB [23~115°F DB]*2
(heat)-18~ 15WB [0~60°F WB]
Item Service Ref.
Rating conditions
Cooling Indoor : D.B. 26.7°C / W.B. 19.4°C
[D.B. 80°F / W.B. 67°F]
Outdoor : D.B. 35°C[D.B. 95°F]
Heating Indoor : D.B. 21.1°C[D.B. 70°F]
Outdoor : D.B. 8.3°C / W.B. 6.1°C
[D.B. 47°F / W.B. 43°F]
Note.*1. 20m[70ft]:In case of installing outdoor unit lower than indoor unit.
*2. 10~46°C[50~115°F]DB:In case of connecting PKFY-P06/P08 type indoor unit.
*3. Electrical data is for only outdoor unit.
(In case of connecting 2 indoor units of PLFY-P18BM type)
Btu/h=kW × 3,412 CFM=K/min × 35.31 lbs=kg/ 0.4536
*Above specification data is subject to rounding variation.