Mitsubishi PFC-AK51BC- Manuals

10 set position set speed set position set speed Indoor fan Compressor normal Outdoor fan R.V. coil (21S4) OFF (COOL) OFF Maximum frequency horizontal Horizontal vane Very Low (temperature of indoor coil thermistor > 64 °F) 30 seconds 30 seconds 30 seconds 40 seconds 5 seconds 5 seconds 40 second...

11 (2) Mode change In case of the following conditions, the operation mode is changed. COOL mode changes to HEAT mode when 15 minutes have passed with the room temperature 2 - 4°F (1 - 2°C) below the set temperature. HEAT mode changes to COOL mode when 15 minutes have passed with the room temperatur...

12 <SWING operation>In swing operation of ECONO COOL operation mode, the initial air flow direction is adjusted to “Horizontal”.According to the temperature of indoor coil thermistor RT12 at starting of this operation, next downward blow time is decided. Then when the downward blow has been fi...

17 2-8. OPERATIONAL FREQUENCY CONTROL OF OUTDOOR UNIT 1. Outline The operational frequency is as following: First, the target operational frequency is set based on the difference between the room temperature and the set tempera- ture. Second, the target operational frequency is regulated by discharg...

19 (3) Control data F E DC B A Ta rget discharge temperature Operational frequency of the compressor 30 50 70 90 110 130 23 38 53 69 84 99 (Hz) (Hz) ( Other models ) ( MUZ-FE18 MUZ-GE24 MUY-GE24 ) (a) Reference value of target discharge temperature COOL / HEAT ( MUZ ) °F/°C Applied model A B C D E F...

20 2. Pre-heat control ON condition (1) Pre-heat control is turned ON for 15 or 30 minutes after the breaker is turned ON. (2) 30 min. after the unit is stopped, pre-heat control is turned ON for 15 or 30 minutes and turned OFF for 30 minutes. This is repeated as shown in the graph until the breaker...

21 3-1. INVERTER SYSTEM CONTROL POWER SUPPLY NOISE FILTER CIRCUIT RESISTOR RELAY SMOOTHING CAPACITOR CURRENT TRANSFORMER COMPRESSOR REACTOR P W V U N IPM PFC U W MS 3~ V + 3-1-1. Inverter main power supply circuit Function of main parts NAME FUNCTION INTELLIGENT POWER MODULE (IPM) It supplies 3-phas...

27 (1) LEV opening correction by discharge temperature The target discharge temperature is determined according to frequency zone and number of operation unit of the com-pressor. <Correction> COOL DRY HEAT Discharge temperature ● 2 ● 2 ● Each correction • (Each gas pipe temperature thermistor ...

31 3-4. HEAT DEFROSTING CONTROL (1) Starting conditions of defrosting When the following conditions a) ~ c) are satisfied, the defrosting starts. a) The defrost thermistor reads 26.6°F or less. b) The cumulative operation time of the compressor has reached any of the set values (defrost interval: 40...

32 COOL Fan speed changes so that the condensing temperature stays within the target range. Fan speed Revolution per minutes (rpm) MXZ-2B20NA- 1 MXZ-3BMXZ-4B 1 100 100 2 150 150 3 200 200 4 250 250 5 300 300 6 350 350 7 400 400 8 450 450 9 500 500 10 550 550 11 600 600 12 650 650 13 700 700 14 750 7...

33 1. Pre-heat control is turned ON for 15 or 30 minutes, after the breaker is turned ON. 2. 30 minutes after the unit is stopped, pre-heat control is turned ON for 15 or 30 minutes and turned OFF for 30 minutes. This is repeated as shown in the graph until the breaker is turned OFF. When the defros...

35 4 MFZ MICROPROCESSOR CONTROL 3. Coil frost prevention Refer to MXZ MICROPROCESSOR CONTROL, COOL OPERATION (3-8.2.). 2. Indoor fan speed control Indoor fan operates continuously at the set speed by FAN SPEED CONTROL button regardless of the thermostat's OFF-ON. In AUTO the fan speed is as follows....

36 1. Thermostat control Refer to MXZ MICROPROCESSOR CONTROL, HEAT OPERATION (3-10.1.). 4-3. HEAT ( ) OPERATION 2. Indoor fan speed control (1) Indoor fan operates at the set speed by FAN SPEED CONTROL button. In Auto the fan speed is as follows. 3. High pressure protection In HEAT operation, the in...

37 4-5. INDOOR FAN MOTOR CONTROL (1) Rotational frequency feedback control The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feed-back the rotational frequency. Comparing the current rotational frequency with the target rotational freque...

38 4-6. AUTO VANE OPERATION Horizontal vane (1) Cold air prevention in HEAT operation When any of the following conditions occurs in HEAT operation, the vane angle changes to Vertical position automati-cally to prevent cold air blowing on users. Compressor is not operating. Defrosting is performed. ...