Toshiba MMY-MUP2401HT8P-A User Manual

11. REPLACING COMPRESSORS
11-1. Compressor Replacement Procedure (Outline)
NOYES
NO
START
Is the outdoor unit the only one in the system?
Recover refrigerant
from the troubled unit
in accordance with
“10 OUTDOOR UNIT
REFRIGERANT
RECOVERY
METHOD”.
Manually open
PMV1, 2 and 3 of the
troubled unit and
recover refrigerant
using a refrigerant
recovery device (*1).
(Refer to 7-7-6 for
operation method)
Turn off the power switch of the troubled outdoor
unit.
Remove the troubled compressor.
Check the color of the oil in the troubled compressor.
ASTM grade: Is it 4 or above?
(Judge the condition of the oil against color samples,
and decide whether to replace the troubled
compressor only or all compressors.)
YES
Replace both the troubled compressor and the
normal compressor.
Measure the amount of oil in the normal compressor.
Adjust the amount of oil according to the oil quantity
measurement result(s).
Install the new compressor(s) (*2).
Perform a leakage check of the troubled outdoor unit.
Perform vacuum drying in the troubled outdoor unit.
Refrigerant charging
END
Measure the amount of oil in the troubled
compressor.
Replace the troubled compressor only.
WARNING
In situations such as indoor unit relocation and
repairs, it is not possible to recover all the refrigerant
held by the system in the outdoor units.
It could cause a serious accident, such as blow out or
injury.
Be sure to perform refrigerant recovery using a
refrigerant recovery device.
WARNING
When detaching a pipe by heating with a burner at
brazed joint, take care as any oil left in the piping may
burn in a momentary flash of fire when the brazed
filler metal melts.
*1 The full-opening of PMV 1, 2, 3 via rotary switch is
automatically undone after 2 minutes, causing the
valves to fully close.
To maintain fully open state, turn off the power
switch of the outdoor unit within 2 minutes
*2 The SMMS-u and the SMMS-i and SMMS-e use
different types of compressors. Be sure to check
the service part code.
1. The compressors that are used as service parts are filled
with oil as listed below (per 1 compressor):
8, 10, 12, 14, 22, 24HP 1900 cc
14A, 16, 18, 20HP
3000 cc
2. The oil volume that was filled in the outdoor unit is listed
as below:
8, 10, 12, 14HP 3400 cc
14A, 16, 18, 20HP
5000 cc
22, 24HP 5800 cc
3. The removed compressors normally filled with oil as
listed below (per 1 compressor):
Oil separator's oil volume is normally around 0~1000 cc.
8, 10, 12, 14, 22, 24HP 800~1400 cc
14A, 16, 18, 20HP
2000~2600 cc
This flowchart only shows the standard
compressor replacement procedure. Since
the situation can differ site by site, perform
the task in accordance with the following
judgment criteria:
- 262 -

Toshiba MMY-MUP2401HT8P-A Specifications

General

Brand	Toshiba
Model	MMY-MUP2401HT8P-A
Category	Air Conditioner
Language	English

Summary

SERVICE MANUAL

SAFETY CAUTION

REFRIGERANT (R410A)

1. WIRING DIAGRAMS

2. PARTS RATING

2-1. Outdoor Unit (50Hz model: MMY-MUP***1HT8(J)P)

Lists parts and ratings for 50Hz outdoor units.

2-5. Inverter Assembly

Details components within the inverter assembly.

2-6. Parts Layout in Outdoor Unit

Visual representation of parts placement in outdoor units.

2-7. Parts Layout in Inverter Assembly

Visual representation of parts within the inverter assembly.

2-8. Outdoor (Inverter) Print Circuit Board

Explains the layout of the outdoor inverter circuit board.

3. REFRIGERANT PIPING SCHEMATIC DRAWING

4. COMBINED REFRIGERANT PIPING SYSTEM SCHEMATIC DIAGRAMS

4-1. Refrigerant Flow (Cooling)

Illustrates the refrigerant flow during cooling operation.

4-2. Refrigerant Flow (Single Defrost)

Illustrates the refrigerant flow during single defrost operation.

4-3. Refrigerant Flow (Heating)

Illustrates the refrigerant flow during heating operation.

4-4. Refrigerant Flow (Individual Defrost)

Illustrates refrigerant flow for individual defrost operations.

4-5-1. (1) Refrigerant Flow (Automatic emergency cooling)

Shows refrigerant flow during automatic emergency cooling.

4-5-2. (1) Refrigerant Flow (Automatic emergency heating)

Shows refrigerant flow during automatic emergency heating.

4-6. Refrigerant Flow (Reclaim)

Illustrates refrigerant flow during the reclaim process.

5. CONTROL OUTLINE

5-1. Outdoor Unit

Details the control functions of the outdoor unit.

6. APPLIED CONTROL AND FUNCTIONS

6-1. Optional connector Specifications of Indoor P.C.Board

Lists specifications for optional indoor P.C. board connectors.

6-2. Test Operation of Indoor Unit

Describes how to perform test operations for indoor units.

6-3. Method to Set Indoor Unit Function DN Code

Explains how to set indoor unit function codes via remote controller.

6-4. Method to set Outdoor Unit Function Code No. (O.DN )

Guides setting outdoor unit function codes using switches or remote controller.

6-5. Applied Control of Indoor Unit

Details control systems using remote location ON/OFF boxes.

6-6. Applied Control of Outdoor Unit

Explains applied controls for outdoor units based on settings.

6-7. Notice Code

Explains how notice codes are displayed and managed.

6-8. System Cooperation Defrosting

Describes how systems cooperate to manage defrosting timing.

6-9. Night operation (Sound reduction control)

Details how to set night operation for reduced sound levels.

7. TEST OPERATION

7-1. Procedure and Summary of Test Operation

Provides an overview and steps for test operations.

7-2. Check Items before Test Operation (before powering-on)

Lists essential checks before starting test operations.

7-3. Check at Main Power-on

Steps to check the system after main power is turned on.

7-4. Address Setup

Procedures for setting system addresses.

7-5. Troubleshooting in Test Operation

Addresses issues encountered during test operations.

7-6. Test Operation Check

Procedures to check system operation after test run.

7-7. Service Support Function

Provides functions for service support and troubleshooting.

7-8. Wave Tool Advance for SMMS-u Series

Information on using the Wave Tool Advance application.

8. TROUBLESHOOTING

8-1. Overview

Provides an overview of troubleshooting procedures and tools.

8-2. Troubleshooting method

Explains how to use check codes for troubleshooting.

8-3. Troubleshooting based on information displayed on remote controller

Troubleshooting based on remote controller displays and history.

8-4. Check Codes Displayed on Remote Controller and SMMS-u Outdoor Unit (7-Segment Display on I/F Board) and Locations to Be Checked

Lists check codes and locations for troubleshooting.

8-5. Diagnosis procedure for each check code

Flowcharts for diagnosing specific check codes.

8-6. 7-Segment Display Function

Explains the function and usage of the 7-segment display.

8-7. Oil Level Judgment Display

How to check compressor oil levels using the display.

8-8. SMMS-u Outdoor Interface P.C. Board Function Setting Change Table

Table detailing DIP switch and function settings.

8-9. Leakage/Clogging of Refrigerating Cycle Circuit

Identifies check codes related to refrigerant or oil circuit issues.

9. BACKUP OPERATION (EMERGENCY OPERATION)

9-1. Note for Backup Operation

Important notes and considerations for backup operations.

9-2. Compressor Backup Operation Setting

Procedure for setting compressor backup operation.

9-3. Outdoor Unit Backup Operation Setting

Procedures for setting outdoor unit backup operation.

9-4. Cooling-Season Outdoor Unit Backup Operation Setting

Specific backup operation settings for cooling season.

9-5. Outdoor Unit Automatic Backup Operation Outline

Overview of the automatic backup operation function.

10. OUTDOOR UNIT REFRIGERANT RECOVERY METHOD

10-1. Refrigerant Recovery from Troubled Outdoor Unit (Reclaim)

Methods for reclaiming refrigerant from faulty outdoor units.

10-2. How to Operate System While Troubled Outdoor Unit Being Repaired

Guides system operation while a unit is under repair.

10-3. Work procedure after Repair

Steps to follow after completing repairs, including vacuuming.

11. REPLACING COMPRESSORS

11-1. Compressor Replacement Procedure (Outline)

Outlines the general steps for compressor replacement.

11-2. Replacement of Compressors

Detailed steps for replacing compressors and adjusting oil.

11-3. Check Procedure to Search Cause of Compressor Oil Shortage

Diagnosing causes of compressor oil shortage.

12. OUTDOOR UNIT PARTS REPLACEMENT METHODS

13. P.C. BOARD REPLACEMENT PROCEDURES

13-1. Replacement of outdoor P.C. board & Inverter Parts

Lists service parts for outdoor PC boards and inverters.

14. EXPLODED DIAGRAM/PARTS LIST

14-1. Outdoor unit (8, 10, 12, 14HP)

Exploded diagram and parts list for 8-14HP outdoor units.

14-2. Outdoor unit (14A, 16, 18, 20HP)

Exploded diagram and parts list for 14A-20HP outdoor units.

14-3. Outdoor unit (22, 24HP)

Exploded diagram and parts list for 22-24HP outdoor units.