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SERVICE MANUAL
<Outdoor unit>
Model name
PUMY-P112VKM6
PUMY-P125VKM6
PUMY-P140VKM6
PUMY-P112YKM5
PUMY-P125YKM5
PUMY-P140YKM5
Salt proof model
PUMY-P112VKM6-BS
PUMY-P125VKM6-BS
PUMY-P140VKM6-BS
PUMY-P112YKM5-BS
PUMY-P125YKM5-BS
PUMY-P140YKM5-BS
PUMY-P112VKM6-ER
PUMY-P125VKM6-ER
PUMY-P140VKM6-ER
PUMY-P112YKM5-ER
PUMY-P125YKM5-ER
PUMY-P140YKM5-ER
PUMY-P112VKM6-ERBS
PUMY-P125VKM6-ERBS
PUMY-P140VKM6-ERBS
PUMY-P112YKM5-ERBS
PUMY-P125YKM5-ERBS
PUMY-P140YKM5-ERBS
Model name
indication
1. SERVICE REF. ··································· 2
2. SAFETY PRECAUTION ······················· 3
3. OVERVIEW OF UNITS ························ 7
4. SPECIFICATIONS ···························· 12
5. DATA ·············································· 14
6. OUTLINES AND DIMENSIONS ··········· 27
7. WIRING DIAGRAM ··························· 29
8. TROUBLESHOOTING ······················· 31
9. DISASSEMBLY PROCEDURE ···········107
10. SYSTEM CONSTRUCTION ···············119
11. ELECTRICAL WIRING ·····················121
12. REFRIGERANT PIPING TASKS ·········122
13. REMOTE CONTROLLER ··················123
Appendix: Installation manual (Exerpt of English Ver.)
PARTS CATALOG (OCB790)
HFC
utilized
R410A
June 2022
OCH790
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Summarization of Contents
SAFETY PRECAUTION
Cautions related to new refrigerant
Safety precautions for handling new refrigerants like R410A.
Cautions for service
Important safety guidelines to follow during service operations.
Additional refrigerant charge
Procedures and precautions for adding refrigerant.
Service tools
List of essential tools for servicing R410A systems.
Precautions for salt-proof type “-BS” model
Special care for salt-resistant models to maintain performance.
Cautions for refrigerant piping work
Guidelines for safe and effective refrigerant piping installation.
OVERVIEW OF UNITS
System construction
Overview of how units are constructed and connected.
System construction (Branch box system)
Details on system configurations using branch boxes.
System construction (Mixed system)
Information on mixed system configurations.
System Specifications
Key technical specifications for the system.
DATA
Selection of indoor and outdoor units
Guidelines for selecting appropriate indoor and outdoor units for a system.
Correction by temperature
How temperature affects unit capacity and performance.
Standard operation data (Reference data)
Reference data for standard operating conditions and parameters.
Standard capacity diagram
Diagrams showing system capacity based on indoor unit load.
Correcting capacity for changes in the length of refrigerant piping
Adjustments to capacity based on refrigerant piping length.
Noise criterion curves
Sound pressure level data across different frequencies for noise assessment.
TROUBLESHOOTING
Checkpoints for test run
Essential checks to perform before initiating a system test run.
Countermeasures for error during test run
Steps to resolve errors detected during system operation.
Remote controller diagnosis
Procedures to diagnose issues with the remote controller.
Remote controller trouble
Common problems and solutions for remote controller issues.
The following symptoms do not represent product failure
Normal operational behaviors misinterpreted as errors.
Internal switch function table
Table detailing the function of internal unit switches.
Outdoor unit input/output connector
Details on external connections and their functions.
How to check the parts
Step-by-step guides for inspecting unit components.
How to check the components
Detailed procedures for testing specific components like thermistors.
Test point diagram
Visual reference for test points on the circuit boards for diagnostics.
Outdoor unit information display
Interpretation of unit status codes and information displays.
DISASSEMBLY PROCEDURE
Removing the service panel and top panel
Steps to remove the main access panels for service.
Removing the fan motor (MF1, MF2)
Procedure for safely removing the fan motor assembly.
Removing the electrical parts box
Guide to accessing and removing the electrical component housing.
Removing the thermistor (TH6)
Steps to remove the suction pipe thermistor for inspection or replacement.
Removing the thermistor (TH7)
Procedure for removing the ambient temperature thermistor.
Removing the thermistor (TH3), thermistor (TH4), and thermistor (TH2)
Steps to remove multiple thermistors for component inspection.
Removing the 4-way valve coil (21S4)
Guide to removing the 4-way valve coil assembly.
Removing the 4-way valve
Procedure for detaching the main 4-way valve component.
Removing bypass valve coil (SV1) and bypass valve
Steps to remove the bypass valve and its coil.
Removing the high pressure switch (63H)
Instructions for removing the high pressure safety switch.
Removing the low pressure sensor (63LS) and high pressure sensor (63HS)
Guide to removing pressure sensors for inspection.
Removing linear expansion valve (LEV-A, LEV-B)
Procedure for removing the linear expansion valve components.
Removing the compressor (MC)
Detailed steps for removing the main compressor unit.
Removing the accumulator
Guide to safely removing the refrigerant accumulator.
SYSTEM CONSTRUCTION
Example of refrigerant piping and transmission cable wiring
Diagrams illustrating typical piping and wiring configurations.
Special function operation and settings for M-NET remote controller
Configuration and special functions for M-NET remote controllers.
Refrigerant system diagram
Schematic showing the flow of refrigerant within the system.
Selecting pipe size
Guidelines for choosing the correct pipe sizes for installation.
System control
Information on system wiring and control methods.
REFRIGERANT PIPING TASKS
Refrigerant piping system
General overview of the refrigerant piping system design.
PRECAUTIONS AGAINST REFRIGERANT LEAKAGE
Critical safety measures to prevent and handle refrigerant leaks.
REMOTE CONTROLLER
Remote controller functions
Overview of the functions and buttons of the remote controller.
Error information
How to check and interpret error codes displayed by the unit.
Service menu
Accessing and navigating the unit's service menu for advanced settings.
Test run
Instructions for performing a test run to verify system operation.
Function setting
Procedures for setting various unit functions via the remote controller.
Error history
How to view and manage past error records.
SELF-DIAGNOSIS
Performing diagnostic checks on the unit's components.
Remote controller check
Function to diagnose potential issues with the remote controller itself.
Special function operation setting
Configuring special operational modes and interlocks.
Search connection information
Tool to find and verify connected controllers and units.
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