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▼ Points to Note When Servicing Compressor (1) When checking the outputs of inverters, remove the wiring from all the compressors. ▼ How to Check Inverter Output (1) Turn off the power supply. (2) Remove compressor leads from the IPDU P.C. board (A3-IPDU). (Be sure to remove all the leads.) (3) Turn on the power supply and start cooling or heating operation. Be careful not to make simultaneous contact with two or more faston connectors for compressor leads or a faston connector and some other object (e.g. the unit cabinet). (4) Check the output voltage across each pair of inverter-side (CN703, 704, 705). If the result is unsatisfactory according to the judgment criteria given in the table below, replace the IPDU P.C. board. No. Measured leads Criterion 1 Red-White 380~580V 2 White-Black 380~580V 3 Black-Red 380~580V * When connecting the compressor leads back to the compressor terminals after checking the output, check the faston connectors thoroughly to ensure that they are not crooked. If there is any loose connector, tighten it with a pair of pliers, etc. before connecting the lead. ▼ How to Check Resistance of Compressor Winding (1) Turn off the power supply. (2) Remove compressor leads from the compressors. (3) With each compressor, check the phase-to-phase winding resistances and winding-to-outdoor cabinet resistance using a multimeter. • Earth fault? ➝ It is normal if the winding-to-outdoor cabinet resistance is 10M or more. • Inter-winding short circuit? ➝ It is normal if the phase-to-phase resistances are in the 0.6-1.0 range. (Use a digital multimeter.) ▼ How to Check Outdoor Fan Motor (1) Turn off the power supply. (2) Remove fan motor leads from the IPDU P.C. board for the outdoor fan (CN703-CN705). (3) Rotate the fan by hand. If the fan does not turn, the fan motor is faulty (locked up). Replace the fan motor. If the fan turns, measure the phase-to-phase winding resistances using a multimeter. It is normal if the measurements are in the 1.14-1.70 range. (Use a digital multimeter.) 193
8-5. Diagnosis procedure for each check code Check code Check code name Cause [E02] / [–] (AI-NET) Signal transmission error on the remote controller Unable to send signals to indoor units * The check code is not indicated on the central control device or the 7-segment indication on the outdoor unit. The communication wiring between the remote controller and indoor units is connected properly. No Connect the wiring properly. Yes The transmission circuit in the remote controller malfunctions. ➝ Replace the remote controller. Check code Check code name Cause [E03] / [97] (AI-NET) Communication error between the indoor unit and remote controller (detected on the indoor unit) No communication from the remote controller/communication adapter The error is detected when the indoor unit cannot receive the signal from the wired remote controller. Check the communication wiring from the remote controller A and B. The check code [E03] is not indicated on the remote controller as its communication is down. However, the code is indicated on the compliant manager of TCC-LINK. Check code Check code name Cause [E01] / [–] (AI-NET) Communication error between the indoor unit and remote controller (detected on the remote controller) 1. Remote controller inter-unit wire error 2. Indoor power error 3. Indoor P.C. board error 4. Remote controller address setup error 5. Remote controller P.C. board error Is the inter-unit wire of remote controllers (A/B) normal? Yes No Correct inter-unit cable of remote controller. Is there no disconnection or connector contact error on harness out of terminal block of indoor unit? Yes Correct connector connection and check circuit wiring. No Is a group control operation? No Yes Is power of each indoor unit turned on? No Check power connection status of indoor unit. (Turn on power again.) Yes Is power applied to remote controller? AB terminals: Approx. DC18V No Check indoor P.C. board. Defect ➝ Replace Yes Is setup of two remote controllers without header remote controller? Yes Change one to header/other to follower. (Remote controller address connector) No Check remote controller P.C. board. Defect ➝ Replace 194
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AIR CONDITIONER (MULTI TYPE) SERVIC
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4-1. Normal Operation (COOL Mode /
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9-4. Cooling-Season Outdoor Unit Ba
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Definition of Protective Gear When
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Precautions for Safety The manufact
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Use specified parts. When any of th
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Only a qualified installer (*1) or
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Specifications Model MMY-MAP0804HT8
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Carrying in the Outdoor Unit CAUTIO
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Selection of Pipe Size Coupling siz
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Table 2 Standard type High Efficien
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4. Tools (1) Required Tools for R41
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Models: MMY-MAP1404* and MAP1604 *
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1-2-2. Compact 4-way Cassette Type
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1-2-4. 1-way Air Discharge Cassette
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1-2-6. 2-way Air Discharge Cassette
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1-2-8. Concealed Duct High Static P
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1-2-9. Slim Duct Type Models: MMD-A
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1-2-11.High Wall Type 2 series Mode
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1-2-13.Floor Standing Cabinet Type
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1-2-15.Floor Standing Type Models:
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Models: MMD-AP0721HFE and MMD-AP096
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2-2. Outdoor Unit (60Hz model: MMY-
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2-4. Outdoor Inverter (60Hz model:
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2-way Air Discharge Cassette Type M
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Concealed Duct High Static Pressure
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Floor Standing Type Model MMF-AP 01
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14, 16HP Model: MMY-MAP1404* , MAP1
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Outdoor Unit (14, 16HP) Model: MMY-
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2-8-2. Inverter P.C. board for comp
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3 Refrigerant Piping Systematic Dra
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Explanation of Functional Parts Fun
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4 Combined Refrigerant Piping Syste
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4-3. Normal Operation (HEAT Mode) H
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4-5. Emergency Operation (Heating O
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5 Control Outline Indoor Unit Cont
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NO. Item Specification outline Rema
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NO. Item Specification outline Rema
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Outdoor Unit Item Description of op
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Item Description of operation, nume
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1 Cooling operation under low outsi
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Central control remote controller (
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6-1-2. When Wireless Remote Control
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Central control remote controller (
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X Y DC5V Power supply circuit Main
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6-2. Indoor Printed Circuit Board M
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MCC-1403 Power supply Power supply
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6-4. Test Operation of Indoor Unit
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Function CODE No. (DN Code) Table (
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Type DN code “10” Value Type Mo
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▼ Ventilating fan control from re
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6-7. Applied control for Outdoor Un
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(2) Indoor unit setup method for pr
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6-8-1. Power peak-cut Control (Stan
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6-8-3. Snowfall Fan Control Header
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6-8-6. Operation Mode Selection Con
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6-8-8. Compressor Operation Output
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7 TEST OPERATION 7-1. Procedure and
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(2) In the case that a central cont
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• Check the additional amount of
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7-4. Address Setup This product req
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(Example) Controlling 2 or more ref
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10 Set the central control address.
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Manual address setup from the remot
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To find an indoor unit’s position
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4 Push the TIME / buttons repeatedl
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2) Turn on dip switch 2 of SW30 on
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7-4-4. Check after Address Setup wh
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7-5-2. Operation from the indoor re
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Page 145 and 146: 7-6-2. Cooling/Heating Test Operati
Page 147 and 148: (2) Test operation START Test opera
Page 149 and 150: 7-7. Service Support Function 7-7-1
Page 151 and 152: 7-7-2. Function to Start/Stop (ON/O
Page 153 and 154: (2) Heating test operation function
Page 155 and 156: (4) Individual start/stop (ON/OFF)
Page 157 and 158: (2)Clearing error by using switches
Page 159 and 160: 7-7-5. Pulse Motor Valve (PMV) Forc
Page 161 and 162: 7-7-8. Fan Operation Check in Outdo
Page 163 and 164: 7-7-10.Manual Adjustment Function o
Page 165 and 166: 7-7-11.Monitor Function of Remote C
Page 167 and 168: 8 TROUBLESHOOTING 8-1. Overview (1)
Page 169 and 170: (Error detected by main remote cont
Page 171 and 172: F12 - F12 ALT F15 - F15 ALT F16 - F
Page 173 and 174: (Errors detected by IPDU featuring
Page 175 and 176: Using TCC-LINK central control remo
Page 177 and 178: Light block Check code Cause of fau
Page 179 and 180: 8-4. Check Codes Displayed on Remot
Page 181 and 182: Main remote controller Check code O
Page 189 and 190: Main remote controller P04 P05 P07
Page 193: Errors Detected by TCC-LINK Central
Page 197 and 198: Check code Check code name Cause Ch
Page 199 and 200: Check code Check code name Cause [E
Page 201 and 202: Check code Check code name Cause [E
Page 203 and 204: Check code Check code name Cause [F
Page 205 and 206: Check code Check code name Cause [H
Page 209 and 210: (*3) Check for solenoid valve of al
Page 215 and 216: Check code Check code name Cause [L
Page 217 and 218: Check code Check code name Cause [P
Page 223 and 224: (C) Heating operation Does heating
Page 227 and 228: (1)Display of System Information (D
Page 229 and 230: (3)Display of Outdoor Cycle Data (D
Page 231 and 232: (5)Display of Indoor Unit Informati
Page 233 and 234: 8-8. Leakage/Clogging of Refrigerat
Page 235 and 236: List of Check Codes Generated upon
Page 237 and 238: 8-9. Sensor Characteristics Outdoor
Page 239 and 240: Indoor TC1 sensor 200 150 Resistanc
Page 241 and 242: 240 Outdoor Unit ▼ Ps sensor char
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(6) Turn on the power supply to all
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(8) Set Bits 1 and 2 of SW30 on the
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10OUTDOOR UNIT REFRIGERANT RECOVERY
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[Setup of failed outdoor unit] (13)
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[Setup of outdoor units other than
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10-3.Work procedure after Repair Wh
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11-2.Replacement of Compressors
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[When replacing normal as well as f
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11-3.Check Procedure to Search Caus
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Check items and procedures to follo
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No. Part to be replaced Work proced
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13P.C. BOARD EXCHANGE PROCEDURES I
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Procedure 1: Reading Setting Data f
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Procedure 3: Writing Setting Data i
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CODE No. list (Example) CODE No. (D
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13-2-3.Interface board (MCC-1606) r
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(6) Set the dip switch (SW800) sett
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13-2-6.Noise Filter P.C. Board (MCC
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(7) Install the service P.C. boards
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SMMS-i OUTDOOR UNIT MMY-MAP1404HT8(
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REFRIGERATION CIRCUIT DIAGRAM M MOT
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Ref. No. Part No. Description MAP08
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SMMS-i INV SERVICE PARTS LIST MMY-M
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SMMS-i OUTDOOR UNIT MMY-MAP0804T8(Z
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SMMS-i OUTDOOR UNIT MMY-MAP0804T8(Z
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SMMS-i OUTDOOR UNIT MMY-MAP1404T8-S
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WARNINGS ON REFRIGERANT LEAKAGE Che
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