Mitsubishi Electronics 100TMU-A, PUHY-80TMU-A Solenoid Valve (SV1, SV2)

Solenoid Valve (SV1, SV2)

Check if the control board’s output signals and the operation of the solenoid valves match.

Setting the self-diagnosis switch (SW1) as shown in the figure below causes the ON signal of each relay to be output to the

LED’s.

Each LED shows whether the relays for the following parts are ON or OFF. When a LED lights up, it indicates that the relay

is ON.

SW1 LED

12345678

12345678910

ON

12345678910

ON

Compressor

operating. Crankcase

Heater

Lights up

all the

time.

21S4 SV1 SV2

1) In the case of SV1 (Bypass Valve)

(a) When the compressor starts, SV1 is ON for 4 minutes, so check operation by whether the solenoid valve is emitting

an operating noise.

(b) Changes in the operating condition by solenoid valve operation can be confirmed by the temperature of the bypass

circuit and the sound of the refrigerant.

2) In the case of SV2 (Bypass)

(a) SV2 goes ON in accordance with the rise in the high pressure in the cooling mode and heating mode, so check its

operation by the LED display and the operating noise emitted by the solenoid valve.

(b) Changes in the operating condition by solenoid valve operation can be confirmed by the temperature of the bypass

circuit and the sound of the refrigerant.

✻Connector connection specifications on the pressure sensor body side.

The connector’s pin numbers on the pressure sensor body side differ from the pin numbers on the main circuit board side.

Sensor Body Side MAIN Board Side

Vcc Pin 1 Pin 3

Vout Pin 2 Pin 2

GND Pin 3 Pin 1

CH 2, 3

Fluid

Level

Heater

-

45

-

Contents

Main Service Handbook Before installation and electric work sBefore installing the unit, make sure you read all the Safety precautions. ELV sThe Safety precautions provide very important points regarding safety. Make sure you follow them. Safety precautions Contents Page Rear Controller Box MAIN board INV board G/A board Power board Page [3] PUHY-80, 100TMU-A ELECTRICAL WIRING DIAGRAM FLAG7 FLAG8 FLAG2 FLAG3 <Operation of self-diagnosis switch (SW1) and LED display> <LED display> LD1 FLAG8 always lights at Display the address and error codes by turns Display at LED lighting (blinking) Remarks SW1 operation [4] Standard operation data Page [5] Function of dip SW and rotary SW (1) Outdoor unit 2. If the address is set from 01 to 50, it automatically becomes 100. 11 Airflow rate (m3/min) External static pressure (Pa) (2) Indoor unit DIP SW1, 3 Model 32 40 48 Capacity (model name) code 16 20 25 SW2 setting Model 08 10 12 16 20 24 Capacity (model name) code 45681013 SW2 setting Page TEST RUN [1] Before Test Run Page Page Page [2] Test Run Method GROUPING REGISTRATION OF INDOOR UNITS WITH M-NET REMOTE CONTROLLER (1) Switch function The switch operation to register with the remote controller is shown below: ii + FILTER Page Group setting mode Page Page Page 4CONTROL [1] Control of Outdoor Unit Page Page Page Page [2] Operation Flow Chart (1) Outdoor unit (Cooling, heating modes) 31 (2) Indoor unit (Cooling, heating, dry, and fan modes) 32 (3) Cooling operation Cooling operation 33 (4) Heating operation (Only for PUHY) 34 (5) Dry operation 35 Outdoor unit [3] List of Major Component Functions 36 Indoor unit Outdoor unit 37 [4] Resistance of Temperature Sensor REFRIGERANT AMOUNT ADJUSTMENT5 [1] Refrigerant Amount and Operating Characteristics [2] Adjustment and Judgement of Refrigerant Amount Page Page 1 2 Refrigerant adjustment method Start 43 6TROUBLESHOOTING [1] Principal Parts Solenoid Valve (SV1, SV2) Outdoor LEV 47 Page 1 2 3 + + + (5) Trouble and remedy of remote controller 50 Page ` 52 53 Page Page Page Page [Caution at replacement of inverter parts] Page Page Page (1) Mechanical [2] Self-diagnosis and Countermeasures Depending on the Check Code Displayed 62 Page Page Page Page Page Page Page Page Page Page Page (2) Communication/system 74 Page Page Page Page Page Page (3) System error 81 Page [3] LED Monitor Display