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.