Instruction/ maintenance manual of the product SEZ-A12 Mitsubishi Electronics
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Air -Conditioner s SEZ-A12, A18, A24AR English INST ALLA TION MAN U AL For safe and correct use, please read this installation manual thoroughly before installing the air-conditioner unit.
2 Contents 1. Safety precautions ................................................................................... 2 2. Selecting the installation location ............................................................. 2 3. Installation diagram & Accessories .
3 3. Installation diagram & Accessories 3.1. Indoor unit (Fig. 3-1) 1 Air inlet (rear side) *Select the either back side or bottom side 2 Electrical par ts bo x 3 Suspension bolt pitch 5 Access door 6 Service space (It is necessar y to maintain a working service area from the ceiling.
4 AB 1 2 3 3. Installation diagram & Accessories Fig. 3-3 3.3. Checking the indoor unit accessories (Fig. 3-3) Check that the indoor unit is equipped with the f ollo wing parts and accessor ies: A.
5 5. Refrig erant piping w ork 5.1. Refrigerant pipe (Fig. 5-1) Maximum difference betw een heights of indoor unit and outdoor unit, the length of refrigerant piping and the number of bends in piping are within limits shown belo w . Models (A) Pipe length (B) Height (C) Number of (one wa y) difference bends (one way) SEZ-A12AR max.
6 a d c b ef 90 ° d c b a 5. Refrigerant piping work b a a b e b c d c A 5.2. Flaring work • Main cause of gas leakage is def ect in flaring work. Carry out correct flar ing w ork in the following procedure . 5.2.1. Pipe cutting (Fig. 5-3) • Using a pipe cutter cut the copper tube correctly .
7 5. Refrig erant piping w ork 5.4. Purging pr ocedures leak test PURGING PROCEDURES Connect the refrigerant pipes (both the liquid and gas pipes) between the indoor and the outdoor units. Remove the service port cap of the stop valv e on the side of the outdoor unit gas pipe .
8 7. Electrical work N A B H C F D E A G N 2 3 N 2 3 N L L 1 2 N B C F E N 2 3 12 N L L A H A D C E A G N 3 N F N L L (1) SEZ-A12AR (1:1 SYSTEM) 7.1. P ower supply (Fig.
9 7. Electrical work Fig. 7-4 LN N 2 3 N 2 3 1 2 5 12 7 6 3 4 65 mm 15 mm 1 2 Fig. 7-3 • P erform wiring as shown in the diagr am to the lower left. (Procure the cable lo- cally). (Fig. 7-3) Make sure to use cables of the correct polarity only . 1 Connecting cable 2 P ow er supply cable 4 core VVF cab le 3 core with ground IEC cord • SEZ-A12:1.
10 7.4. Outdoor unit (Fig. 7-8) • Connect cable from the indoor unit correctly on the terminal-bloc k. • Use the same terminal block and polarity as is used with the indoor unit. • For aftercare maintenance , giv e extr a length to connecting cable .
11 9. Air filter installation 9.1. Confirmation of enc losed par ts (Fig. 9-1) • Please ensure all the par ts sho wn below are present bef ore starting installation. 1 Filter × 1 2 Filter rail × 1 3 Filter rail × 1 4 ST . screw (4 × 10) × 14 5 Clamp × 2 6 Seal × 2 12 3 Fig.
12 9. Air filter installation 9.4. Filter installation points (Rear air intake) (Fig. 9-4) 1. Inser t the filter into rail 2 2. Hook the filter onto rail 3 A Control box B Drain pan D Filter E Rail 2 F Rail 3 Fig. 9-4 1 2 B A E D F Fig. 9-5 2 1 A E D F A F H G E 9.
13 10.1. Bef ore test run s After completing installation and the wiring and piping of the indoor and outdoor units, c heck f or refrigerant leakage, looseness in the power suppl y or control wiring, wr ong polarity , and no disconnection of one phase in the supply .
14 10.4. A UT O REST ART FUNCTION This model is equipped with the A UT O REST ART FUNCTION. When the indoor unit is controlled with the remote controller , the operation mode, set temperature , and the fan speed are memorized b y the indoor controller board.
15 1 Wiring from the Remote Control This wire is connected to terminal block f or remote controller of the indoor unit (non- polar). 2 When a Different Refrigerant System Grouping is Used. Up to 4 refrigerant systems can be controlled as one group using the MA remote controller .
Please be sure to put the contact address/telephone number on this manual before handing it to the customer. • Low Voltage Directive 73/23/ EEC • Electromagnetic Compatibility Directive 89/ 336/ EEC This product is designed and intended for use in the residential, commercial and light-industrial environment.
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