Mitsubishi Electric PAC-AKA51BC - Manual

Page 2 - SAFETY PRECAUTION; Cautions for units utilizing refrigerant R410A; Use new refrigerant pipes.

2 1 SAFETY PRECAUTION Cautions for units utilizing refrigerant R410A 1-1. ALWAYS OBSERVE FOR SAFETY Use new refrigerant pipes. Charge refrigerant from liquid phase of gascylinder. If the refrigerant is charged from gas phase, composition change may occur in refrigerant and the efficiency will be low...

Page 3 - When charging directly from cylinder

3 Gravimeter Unit [3] Service tools (1) Use the below service tools as exclusive tools for R410A refrigerant. No. Tool name Specifications 1 Gauge manifold ·Only for R410A ·Use the existing fitting specifications. (UNF1/2) ·Use high-tension side pressure of 5.3MPa·G or over. 2 Charge hose ·Only for ...

Page 4 - -3. Cautions for refrigerant piping work; Thickness of pipes

4 1-3. Cautions for refrigerant piping work New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is same as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the working pressure of R...

Page 5 - OVERVIEW OF UNITS; Capacity; Max. 2 branch boxes can be connected to 1 outdoor unit.

5 2 OVERVIEW OF UNITS 2-1. CONSTRUCTION OF SYSTEM 6HP Rated capacity (kBTU/h) (Cooling/Heating) 48/54 MXZ-8B48NA R410A Indoor unit that can be connected Branch boxthat can be connected Capacity Number of unitsTotal system wide capacity Type 06 ~ Type 24 2 ~ 8 units 1 ~ 2 units 22.2 ~ 130 % of outdoo...

Page 6 - Outdoor unit; M X; Symbol of factory; Branch box

6 Indoor unit (Ceiling concealed type) Indoor unit (Wall mounted type) Outdoor unit Branch Box 2-2. SYSTEM OUTLINE The additional connection of the Branch Box together with employment of the compact trunk-looking outdoor unit can suc-cessfully realizes a long distance piping for big houses. Equipped...

Page 7 - Branch box is located INSIDE of condominium; Living; System example of 5 indoor units; Total rated capacity

7 2-3. TYPICAL COMBINATION EXAMPLE Branch box is located INSIDE of condominium Branch box (Inside) Installing branch box indoors Only 1 piping is required between the outdoor and indoor offering a fine external view. Branch box (5 branch type) Outdoor unit SEZ-18 MSZ-12 MSZ-12 MSZ-09 MSZ-09 Living D...

Page 8 - Piping connection size; Liquid; In case of using 1-branch box

8 2-4. SIMPLIFIED PIPING SYSTEM Piping connection size Liquid Gas W 9.52 mm (3/8 inch) W 15.88 mm (5/8 inch) The piping connection size differs according to the type and capacity of indoor units. Match the piping connection size of branch box with indoor unit.If the piping connection size of branch ...

Page 9 - SPECIFICATIONS; Standard performance; Cooling; OUTDOOR UNIT; fl; REFRIGERANT PIPING

9 3 SPECIFICATIONS • Outdoor unit : MXZ-8B48NA Conversion formula: kcal/h = kW % 860 Btu/h = kW % 3412 CFM = m 3 /min % 35.31 Service Ref. MXZ-8B48NA Standard performance Indoor type Non-Ducted Mix Ducted Cooling Capacity Rated / Max (*1) Btu/h 48000 / 54000 Rated power consumption (*1) W 5780 6125 ...

Page 11 - DATA

11 4 DATA 4-1. CAPACITY AND CHARACTERISTICS Note:• Cooling capacity is based on D.B. 26.7 °C / W.B. 19.4 °C (D.B. 80 °F / W.B. 67 °F) (indoor temperature), D.B. 35 °C (D.B. 95 °F) (outdoor temperature). • Heating capacity is based on D.B. 21.1 °C (D.B. 70 °F) (indoor temperature), D.B. 8.3 °C / W.B....

Page 31 - -2. CORRECTING COOLING AND HEATING CAPACITY; • Standard conditions:; Individual capacity at the rated time; Total capacity at the rated time

31 4-2. CORRECTING COOLING AND HEATING CAPACITY 4-2-1. Correcting Changes in Air Conditions (1)The performance curve charts (Figure 1-1, 1-2, 2-1, 2-2) show the change ratio of capacity and input (power consumption) according to the indoor and outdoor temperature condition when define the rated capa...

Page 32 - (2) Method for Obtaining the Corrected Piping Length; number of bends in the; Fig. 3 Cooling capacity correction curve; Corrected piping length; Fig. 4 Heating capacity correction curve

32 4-2-2. Correcting Capacity for Changes in the Length of Refrigerant Piping To obtain the ratio (and the corrected piping length) of the outdoor units Max. capacity and the total in-use indoor capacity, first find the capacity ratio corresponding to the standard piping length from Fig.3, Fig.4 and...

Page 34 - OUTLINES AND DIMENSIONS; Example of Notes

34 5 OUTLINES AND DIMENSIONS 5-1. OUTDOOR UNIT unit : mm (inch) MXZ-8B48NA Min.500mm <19-1 1/16> Min.500mm <19-1 1/16> Min.150mm <5-29/32> Min.10mm<3/8> Handle Side Air Intake Front piping cover Rear piping cover Air intake Rear Air Intake Handle 31<1-7/32> 74<2-19/3...

Page 36 - WIRING DIAGRAM

36 6 WIRING DIAGRAM 6-1. OUTDOOR UNITMXZ-8B48NA The black square ( ■ ) indicates a switch position. (L2-Phase) (L1-Phase)

Page 38 - In case of using 2-branch boxes; NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION; REFRIGERANT SYSTEM DIAGRAM MXZ-8B48NA; Match the piping connection size of branch box with indoor unit.

38 A A A B B B B B 2 branches pipe (joint) : optional parts Branch box #1 Branch box #2 ■ In case of using 2-branch boxes A B B B B B Branch box 7 NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION REFRIGERANT SYSTEM DIAGRAM MXZ-8B48NA Piping connection size Thermistor TH6 (Pipe temperature : condenser) T...

Page 39 - TROUBLESHOOTING

39 8 TROUBLESHOOTING <Error code display by self-diagnosis and actions to be taken for service (summary)> Present and past error codes are logged and displayed on the wired remote controller and control board of outdoor unit. Actions to be taken for service, which depends on whether or not the...

Page 40 - Insulation resistance; refrigerant in the compressor.; The followings must be checked as well.; Refer to the indoor unit installation manual.; About the restart protective mechanism

40 8-2. CHECK POINTS FOR TEST RUN 8-2-1. Before test run Turn on the main power switch more than 12 hours before starting operation. Starting operation just after turning on the power switch can severely damage the internal parts. Keep the main power switch turned on during the operation season. Aft...

Page 41 - Cooling operation

41 8-2-3. Test run by outdoor unit SW4 The setting of test run (ON/OFF) and its operation mode (cooling/heating) can be set by SW4 on the controller board of out-door unit. 1 Set operation mode (cooling or heating) by SW4-2. 2 Start test run by setting SW4-1 to ON ( ) with the indicated operation mo...

Page 42 -

42 8-3. SELF-DIAGNOSIS ACTION TABLE <Abnormalities detected when the power is put on> (Note 1) Refer to indoor unit section for code P and code E. Error Code Abnormal point and detection method Case Judgment and action None — 1 No voltage is supplied to termi- nal block (TB1) of outdoor unit. ...

Page 44 -

44 Error Code Abnormal point and detection method Judgment and action U1 (1302) (1) High-pressure switch (63H) operated Abnormal if high-pressure switch 63H oper-ated ( w ) during compressor operation. w 4.15 MPa [602PSIG] 63H: High-pressure switch (2) High pressure (High - pressure sensor 63HS dete...

Page 50 - -4. TROUBLESHOOTING BY INFERIOR PHENOMENA

50 Phenomena Factor Countermeasure 2. Remote controller display works normally and the unit performs heating operation, however, the capacity cannot be fully obtained. 1 Linear expansion valve fault Opening cannot be adjusted well due to linear expan- sion valve fault. 2 Refrigerant shortage 3 Lack ...

Page 54 - Low temperature thermistors; SENSOR

54 0 10 20 30 40 50 -20 -10 0 10 20 30 40 50 -4 -14 32 50 68 86 104 122 °F Temperature Resistance (k ) 500 400 300 200 100 0 25 50 75 100 120 77 122 167 212 248 °F Temperature Resistance (k ) <Thermistor feature chart> Low temperature thermistors • Thermistor <Outdoor pipe> (TH3)• Thermi...

Page 56 - ; Linear expansion valve; (1) Operation summary of the linear expansion valve

56 <Output pulse signal and the valve operation> (2) Linear expansion valve operation Open Extra tightening (about 32 pulse) Pulse number 500 pulse Opening a valve all the way Close V alve position (capacity) Opening a valve : 8 → 7 → 6 → 5 → 4 → 3 → 2 → 1 → 8 Closing a valve : 1 → 2 → 3 → 4 →...

Page 57 - (3) How to attach and detach the coil of linear expansion valve; Be sure to attach the

57 Main body Lead wire Stopper Coil (3) How to attach and detach the coil of linear expansion valve <Composition>Linear expansion valve is separable into the main body and the coil as shown in the diagram below. A <How to detach the coil> Hold the lower part of the main body (shown as A)...

Page 58 - Troubleshooting; Problem

58 Troubleshooting Problem Check point Corrective measure If the linear expansion valve becomes locked and the motor is still operating, the motor will emit a clicking noise and will not function. This clicking noise indicates an abnormality. Use an all-purpose electrical meter to measure the resist...

Page 59 - LED

59 Communication power supply D71 Voltage 24V DC CNS S1-S2: 208/230V AC (Branch box/outdoor unit connecting wire) CNAC 2 to 4 : Power supply for outdoor controller circuit board (208/230V AC) 1 to 3 : Power supply for indoor and outdoor unit connection wire (208/230V AC) CNF1, CNF2 Connect to the fa...

Page 60 - CNDC

60 Outdoor power circuit boardMXZ-8B48NA CNAC1, CNAC2 208/230 V ACConnect to the out-door controller circuit board (CNAC) NI, LI Voltage of 208/230 V AC is input (Connect to the terminal block (TB1)) EI, E4 Connect to the earth DCL1, DCL2 Connect to DCL P2 Connect to the smooth-ing capacitor CB + U/...

Page 64 - ; SW2 setting

64 <Outdoor unit operation monitor function> Digital indicator LED3 displays 2 digit number or code to inform operation condition and the meaning of error code by controlling DIP SW2 on outdoor controller. SW2 setting 1 ON 2 3 4 5 6 Display detail Explanation for display Unit Operation indicat...

Page 78 - -9. SELECTING FUNCTIONS USING THE REMOTE CONTROLLER; No.1 Average data of the; Function

78 8-9. SELECTING FUNCTIONS USING THE REMOTE CONTROLLER Each function can be set according to necessity using the remote controller. The setting of function for each unit can only be done by the remote controller. Select function available from the table 1. (1) Functions available when setting the u...

Page 79 - PRECAUTIONS AGAINST REFRIGERANT LEAKAGE; ) and find the room with the smallest volume; (a) Situation in which there are no partitions; -2. CONFIRMING PROCEDURE OF R410A CONCENTRATION; (1) Calculate total refrigerant amount by each refrigerant system.

79 9 PRECAUTIONS AGAINST REFRIGERANT LEAKAGE Indoor unit Outdoor unit 9-1. INTRODUCTION R410A refrigerant of this air conditioner is non-toxic and non-flammable but leaking of large amount from an indoor unit into the room where the unit is installed may be deleterious.To prevent possible injury, th...

Page 80 - the second smallest room.

80 Indoor unit The smallest room The second smallest room Outdoor unit Ventilation apparatus Indoor unit Opening Wall Outdoor unit (Situation in which there are no door openings or in which there are openings above and blow doors that occupy at least 0.15% of the floor area) (3) Use the results of c...

Page 81 - DISASSEMBLY PROCEDURE; OPERATING PROCEDURE; Removing the service panel and top panel; Photo 1

81 10 DISASSEMBLY PROCEDURE OPERATING PROCEDURE PHOTOS & ILLUSTRATION 1. Removing the service panel and top panel (1) Remove 3 service panel fixing screws (5 × 10) and slide the hook on the right downward to remove the service panel. (2) Remove screws (3 for front, 3 for rear/5 × 10) of the top ...

Page 82 - Photo 4; Photo 5

82 OPERATING PROCEDURE PHOTOS Photo 4 4. Removing the thermistor <Outdoor 2-phase pipe> (TH6) (1) Remove the service panel. (See Figure 1) (2) Remove the top panel. (See Figure 1) (3) Disconnect the connectors, TH6 and TH7 (red), on the controller circuit board in the electrical parts box. (4)...

Page 83 - Photo 7; bypass valve; Photo 8

83 OPERATING PROCEDURE PHOTOS 7. Removing the solenoid valve coil <4-way valve> (21S4) (1) Remove the service panel. (See Figure 1) (2) Remove the top panel. (See Figure 1) [Removing the solenoid valve coil <4-way valve>] (3) Remove 4-way valve solenoid coil fixing screw (M4 × 6). (4) Re...

Page 84 - Photo 9

84 11. Removing the high pressure switch (63H) and low pressure switch (63L) (1) Remove the service panel. (See Figure 1) (2) Remove the top panel. (See Figure 1) (3) Remove the electrical parts box. (See Photo 4) (4) Remove 3 right side panel fixing screws (5 o 10) in the rear of the unit and remov...

Page 85 - Removing the controller cover and under panel; Removing the drain pan; Photo 2

85 OPERATING PROCEDURE PHOTOS 1. Removing the controller cover and under panel (1) Remove 3 controller cover fixing screws (4 o 10) to detach the cover. (See Photo 1) (2) Remove 6 under panel fixing screws (4 o 10) to remove the panel. (See Photo 1) Photo 1 Controller cover fixing screws Under panel...

Mitsubishi Electric PAC-AKA51BC - Manual

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Summary

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