Contents
Parts Catalog OCB429
Reference Manual
Indoor Unit
Safety Precaution
Always Observe for Safety
When charging directly from cylinder
Additional refrigerant charge
R22
PUZ-A18NHA2 PUZ-A18NHA2-BS PUY-A12/18NHA2 PUY-A12/18NHA2-BS
Features
PUZ-A42NHA2 PUZ-A42NHA2-BS PUY-A42NHA2 PUY-A42NHA2-BS
Specifications
PUZ-A18NHA2 PUZ-A24NHA2 PUZ-A30NHA2 PUZ-A36NHA2 PUZ-A42NHA2
PUY-A18NHA2-BS PUY-A24NHA2-BS
Compressor Technical Data
Data
Noise Criterion Curves
PUZ-A18NHA2-BS
Standard Operation Data
Heat pump
Cooling only
PKA-A12GA PKA-A18GA PKA-A24FA PKA-A30FA PKA-A36FA PLA-A42BA
Outdoor Unit
Unit mminch
Example of Notes
Service Space
662-5/8 Air outlet
Wiring Diagram
NET Adapter
PUZ-A24NHA2 PUZ-A24NHA2-BS PUY-A24NHA2 PUY-A24NHA2-BS
NET Adapter
WUse copper supply wires
TABU/V/W
Wiring Specifications
System Simultaneous twin system
Separate Indoor UNIT/OUTDOOR Unit Power Supplies
OFF
Indoor Outdoor Connecting Cable
NET Wiring Method
Refrigerant address NET address Control Remote Controller
Regulations in address settings
NET address setting
Refrigerant address setting
NET wiring
PUZ-A42NHA2 PUZ-A42NHA2-BS
Refrigerant System Diagram
PUZ-A18NHA2 PUZ-A18NHA2-BS
Way valve solenoid coil Heating on Cooling OFF
PUY-A12/18NHA2 PUY-A12/18NHA2-BS
PUY-A42NHA2 PUY-A42NHA2-BS
Refrigerant recovering pump down
Start and finish of test run
Check Point Under Test RUN
Troubleshooting
Troubleshooting
Before test run
Symptoms in test run mode Cause Remote Controller Display
Operating procedures
Contents of inferior phenomena
Test run for wireless remote controller
When a Problem Occurs During Operation
HOW to Proceed SELF-DIAGNOSIS
Self-Diagnosis During Maintenance or Service
Remote Controller Diagnosis
ON/OFF
Procedure
Malfunction-diagnosis method by wireless remote controller
Malfunction-diagnosis method at maintenance service
Case of trouble during operation
U9,UH
SELF-DIAGNOSIS Action Table
Error Code Abnormal point and detection method Case
63L connector open
Cndc
Connector open
Error Code
Case Judgment and action 63H connector open
Indoor/outdoor unit connector
Abnormalities detected while unit is operating
Case Judgment and action High pressure High-pressure switch
High discharging temperature
63H worked
Power module
Temperature thermistor TH4
Temperature of heatsink
Case Judgment and action Open/short circuit of discharge
Current sensor error
Synchronous signal to main circuit
When compressor locked
Case Judgment and action Outdoor fan motor
Remote controller control board
Remote controller transmission
ErrorE0/signal receiving errorE4
Case Judgment and action Low pressure 63L worked
Error Signal receiving error
Case Judgment and action Remote controller transmission
ErrorE3/signal receiving errorE5
Non defined error code
Hardware error of transmission
NET communication error
Case Judgment and action Pipe temperature
Case Judgment and action Address duplicate definition
To the next
Master
From the previous
Fresh Master
Lossnay
VCTF, VCTFK, CVV CVS, VVR, VVF, VCT
Troubleshooting by Inferior Phenomena
Phenomena Factor Countermeasure
Melans
Please Wait
YES
Outdoor connecting wire
Outdoor power circuit board
Power supply To the outdoor unit Check the breaker
Miswiring, breaking
Not lighting
Indoor/outdoor connecting wire Blinking
Defective indoor Replace the indoor Power board
Breaking or poor Fix the breaking or poor
Check if there is breaking
Before repair Frequent calling from customers
Action Table
Refrigerant in the air conditioner is switched
Phone Calls From Customers How to Respond
Sometimes This is the sound which is heard when the flow
This is not a malfunction
With Airflow Direction…
With Blower…
There might be a case that
Page
HOW to Check the Parts
Fuse check
Wiring contact check
Power supply check Remove the connector CNF1
END
Medium temperature thermistor
HOW to Check the Components
Thermistor feature chart Low temperature thermistors
High temperature thermistor
Operation summary of the linear expansion valve
Output pulse signal and the valve operation
Linear expansion valve operation
Linear expansion valve A24, 30, 36
How to detach the coil
How to attach the coil
Be sure to attach the stopper
Releasing emergency operation
Emergency operation procedure
Emergency Operation
SW4
Operation data during emergency operation
Test Point Diagram
CN5
LI, NI
CNAC1, CNAC2
LO, no
PUZ-A24NHA2 PUZ-A24NHA2-BS PUY-A24NHA2 PUY-A24NHA2-BS
RS1
DIP-IPM
LD1-LD2
DIP-PFC
CN3 CN4 CN5
TABP2/SC-P2
Cnaf
CN3
Actm
Lower side
Upper side
L1, L2
Function Action by the switch operation Effective timing
Function of SWITCHES, Connectors and Jumpers
Function of switches
OFF
2Function of connector
SW9
50%
Special function
75%
Display function of inspection for outdoor unit
Blinking Abnormality of outdoor fan Motor rotational speed
1Check the outdoor fan motor 1Check if stop valves are open
Operation indicator
Digital indicator LED1 working details
Example When 2450 hours 245 10 hours
Example When 42500 times 425 100 times Secs 5secs
~9999 When it is 100 hours or more, hundreds digit, tens
Lighting Cancellation of postponement
SW2 setting Display detail Explanation for display Unit
Unit
Outdoor unit setting information
Single phase 2 3 phase
Cooling only
DegF
Fan step on error occurring ~10 Step
Example When 130 pulse
Example When 415 minutes Minute Secs
Discharge superheat on error occurring ~327 0~182degC SHd
Secs Sub cool on error occurring. SC ~234 0~130degC
U9 Error status during the Error
Rise of discharge temperature
LED
Switching to maintenance mode
Easy Maintenance Function
Maintenance Mode Operation Method
Fixed Hz operation
Data measurement
To check the data for each item, repeat steps 5 to
Guide for Operation Condition
Data of the sensor Ta=C On main remote Controller
Function Setting
Unit Function Setting by the Remote Controller
Average data Initial Ta=A+B/2 Sensor on all
Setting No Settings
Mode No.11
PLA-BA PCA-GA
Specified indoor unit
Selecting functions using the wired remote controller
For modes 15 and higher
Press E FAN operation
Operating Procedure
Flow of function selection procedure
Operating instructions
Function Selection of Remote Controller
Mode Selection
Function selection flowchart
Mode Vane
FAN
Turn on the Monitoring the operation data
Button for 3 seconds to switch to Maintenance monitor
Check button for 3 seconds to return to maintenance mode
Press
Request Code List
Outdoor unit-Control state
Code Description
100
For indoor fan pulsation control
Detail Contents in Request Code
101
Fan control state Request code
Error content U9 Request code
102
Actuator output state Request code
103
Outdoor unit --Capacity setting display Request code
Outdoor unit Setting information Request code
Contact demand capacity Request code
104
105
Indoor unit Model setting information Request code
Indoor unit Capacity setting information Request code
Data display See the table on the right
106
Disassembly Procedure
PUZ-A18NHA2 PUZ-A18NHA2-BS Operating Procedure Photos
Photo
Removing the electrical parts box
Removing the thermistor Outdoor 2-phase pipe TH6
107
Thermistor Outdoor pipe TH3
Operating Procedure Photos
108
Removing the 4-way valve
109
Removing linear expansion valve
Removing the compressor MC
Separator Recover refrigerant
110
Removing the accumulator
111
Operating Procedure Photos & Illustration
Removing the service panel and top panel
Removing the fan motor MF1
Removing the thermistor Outdoor pipe TH3
112
Thermistor Discharge TH4
Removing the linear expansion valve coil
113
Removing the 4-way valve coil
Removing the bypass valve coil
Removing the bypass valve
114
Removing the reactor ACLA24
Removing the reactor DCL A30
115
Remove 2 receiver leg fixing screws 4
116
Removing the fan motor MF1, MF2
117
Remove the service panel. See figure Outdoor pipe
Remove the top panel. See figure Controller
Linear expansion
118
Are not oxidized
Coil Valve coil
Removing the reactor DCL and capacitor CE
Low pressure switch 63L
119
DCL
Remove 2 back cover panel fixing screws 5 10