Air-Conditioners PLH-2, 2.5KKC FOR INSTALLER ON/OFF – CENTRALLY CONTROLLED 1Hr. ON OFF FILTER CHECK ˚C CLOCK CHECK MODE ˚C TEST RUN STAND BY DEFROST NOT AVAILABLE INSTALLATION MANUAL For safe and correct use, please read this installation manual thoroughly before installing the air-conditioner unit.
• Use only accessories authorized by Mitsubishi Electric and ask the dealer or an authorized technician to install them. If accesso- ries are installed improperly, water leakage, electric shock or fire may result.
• When installing an optional air cleaner or humidifier, be sure to use only products specified by Mitsubishi. All accessories must be installed by an authorized technician. The user must not try to install accessories. Improperly installed accessories can cause water leakage, electric shock or fire.
1. Safety Precautions 1.1. Before installation and electric work Caution: • Do not install the equipment where combustible gas may leak and accumulate resulting in fire. • Do not keep food, plants, caged pets, artwork or precision instru- ments in the indoor unit’s direct airflow or too close to the unit, as these items can be damaged by temperature changes or drip- ping water.
1. Safety Precautions 1.1. Before installation and electric work Drain piping Caution: • Install drain piping according to this Installation Manual to en- sure proper drainage. Place thermal insulation on the pipes to prevent condensation. Improper drain piping may cause water leakage and damage to furniture or other possessions.
1. Safety Precautions 1.2. Before starting the trial run Caution: • Before starting operation, check that all panels, guards and other protective parts are correctly installed. Rotating, hot or high volt- age parts can cause injuries. • Do not touch the refrigerant pipes with bare hands during opera- tion.
2. Indoor unit installation location 2.1. Outline dimensions (mm) Models PLH-2, 2.5 • Mount the indoor unit on a wall strong enough to withstand the weight of the unit. • Select a location so that air can be blown into all corners of the room.
3. Outdoor unit installation location 3.2. Ventilation and service space When installing a single outdoor unit 1 Service space Maintain an easily accessible service space in front of the unit as shown in the diagram. A 10 mm or more B 500 mm or more C 500 mm or more D Service space...
3. Outdoor unit installation location 3.2. Ventilation and service space When installing many outdoor units 1 Side-by-side arrangement Remove the side screw on the pipe cover. Keep the top unobstructed. A Min. 100 mm B Min.10 mm C Min. 200 mm D Up to 10 units (When the air outlet guides (sold separately) are used, no more than five units should be arranged side by side.) E Min.
3. Outdoor unit installation location 4. Installing the indoor unit 3.2. Ventilation and service space Installation on a rooftop or other windy places When installing the unit on a rooftop or other location unprotected from the wind, situate the unit’s air outlet so that it is not directly exposed to strong winds.
4. Installing the indoor unit 4.2. Ceiling Openings and Suspension Bolt Installation Locations 690~710 25~35 25~35 • Using the accompanying installation template and gauge, install the main unit in such a way that the opening on ceiling falls at the place shown in following diagram (usage method of template and gauge is shown printed on them, respectively).
4. Installing the indoor unit 4.3. Suspension Structure (Give site of suspension strong structure.) • The ceiling work differs according to the construction of the building. Buidling constructors and interior decorators should be consulted for details. (1) Extent of ceiling removal: The ceiling must be kept completely horizon- tal and the ceiling foundation (framework: wooden slats and slat hold- ers) must be reinforced in order to protect the ceiling from vibration.
4. Installing the indoor unit 4.4. Unit Suspension Procedures G Suspend the main unit as shown in the diagram. Parts to be prepared at site. • Suspension bolts (M10 or W3/8) ............. 4 • Nuts (M10 or W3/8) ............... 12 Parts to be attached to the unit.
4. Installing the indoor unit 5. Installing the outdoor unit 4.5. Confirming the Position of Main Unit and Tightening the Suspension Bolts • Using the gauge attached to the grilles, ensure that the bottom of the main unit is properly aligned against the opening on ceiling. Be sure to confirm this, otherwise the dripping of condensation due to leakage of wind and etc occur.
41 – 50 m 6.1. Refrigerant and drainage pipe sizes PLH-2 — PLH-2.5 Refrigerant and Drainage Piping Sizes Model PLH-2, 2.5 Item 2 Air purge Refriger- Liquid ODø9.52 (3/8") Never air purge the refrigerant piping by releasing the refrigerant (gas) ant piping ODø15.88 (5/8")
6. Cooling pipe and drain pipe 6.4. Refrigerant piping 6.4. Refrigerant piping 1.2. When using commercially available copper pipes: 1) Indoor unit See that stop valve on outdoor unit is fully shut (unit is shipped with • This unit has the flared connections on both indoor and outdoor sides. valve shut).
6. Cooling pipe and drain pipe 6.4. Refrigerant piping 2) Outdoor unit 1 Pipe take-in direction The pipe can be passed in any of the four directions: front, rear, right and lower side. A Front piping (knockout) B Lower piping C Right piping (knockout) D Back piping E Piping cover...
6. Cooling pipe and drain pipe 6.5. Drainage Piping Work • Use VP25 (O. D. ø32 PVC TUBE) for drain piping and provide 1/100 or more downward slope. • Be sure to connect the piping joints using adhesive of polyvinyl chlo- ride family.
6. Cooling pipe and drain pipe 7. Electrical work 6.5. Drainage Piping Work 1. Connect the flexible tube (supplied with the unit) to the drain port. (Must not be bent more than 45 degrees.) (Affix the tube using PVC adhesive then secure it with a band.) 2.
7. Electrical work 7.2. Indoor unit 1. Remove two electrical wiring service panels. 2. Wire the power cable and control cable separately through the respec- tive wiring entries given in the diagram. • Do not allow slackening of the terminal screws •...
7. Electrical work 7.3. Remote controller 1) Installing procedures (2) Seal the service entrance for the remote controller cord with putty to prevent possible invasion of dew drops, water, cockroaches or worms. A For installation in the switch box: • When the remote controller is installed in the switch box, seal the junc- tion between the switch box and the conduit tube with putty.
7. Electrical work 7.3. Remote controller 2) Connecting procedures • The remote controller cord may be extended up to 500 m. Since the remote controller cord supplied with the unit is 10 m-long, use those A. 1 B. 2 electric wires or (two-core) cables of 0.3 mm to 1.25 mm for exten- sion.
7. Electrical work 7.3. Remote controller 3) Fitting the upper case 1 Put the upper latches (at two locations) first then fit the upper case into the lower case as illustrated. 2 To remove the upper case, put a slotted screwdriver tip in the latches as shown in the diagram then move the screwdriver in the direction of arrow.
7. Electrical work 7.4. Outdoor unit Warning: Tighten terminal screws securely. 1 Remove the service panel (2 screws). A Earth terminal (Do not forget to install earth.) B Service panel C Indoor/Outdoor unit connecting terminals D Power supply terminals E Fasten with wiring clamp F Pipe cover 2 The wiring outlet consists of the rear pipe hole and wiring hole in the pipe cover (knock out).
7. Electrical work 7.5. Power supply wiring diagram (exam- ple) Electric wiring should be done according to the appropriate wiring dia- gram for the model being installed. For electric wire specifications, see page 31. Be sure to comply with those specifications.
7. Electrical work 7.6. System control s Remove all of the CN 40 connectors from the indoor controller boards of the slave units. s Then, set the unit addresses of each unit. (Those addresses are also serving as a part of the sequential starting timer). CN40 Setting unit address with SW2 switch ON 1...
8. Test run 8.1. Before test run s After installation of indoor and outdoor units, and piping and elec- tric wiring work, re-check that the unit is free from leaks of refrig- erant, loosened connections, and incorrect polarity. s Measure an impedance between the power supply terminal block (L, N) on the outdoor unit and the ground with a 500 V Megger and check that it is equal to or greater than 1.0 MΩ...
8. Test run 8.3. Self-diagnosis C For available LED displays (LEDs 1, 2) on the indoor unit board, refer to the table below. LED2 (Microprocessor Should remain ON always to indicate the con- power supply) trol power supply is turned ON. Lights up to indicate the power is connected to the wired remote controller.
9. Troubleshooting If any of the above-mentioned functions do not work properly, search for the cause in the following chart and correct accordingly. (This troubleshooting chart applies only to operation in trial run mode.) Symptoms Cause One-to-one system Group control •...
10. Field electrical wiring (Power wiring specifications) Models PLH-2KKC PLH-2.5KKC Power supply Phase ~ (Single) Frequency & Voltage 50 Hz, 240V Input capacity Indoor unit (A) 16/16 16/16 Main switch/Fuse Outdoor unit (A) 32/32 32/32 Indoor unit Wire No. Power supply...
11. Installing the grille 11.1. Checking the contents • This kit contains this manual and the following parts. Accessory name Q’ty Remark 760 × 760 (mm) Grille M5 × 0.8 × 25 Screw with captive washer Gauge (Divided into four parts) ø8 ×...
11. Installing the grille 1) Removing the intake grille I PLP-2.5KC I PLP-2.5KC • Slide the levers in the direction indicated by the arrow 1 to open the intake grille. • Move the intake grille’s shaft, and it will come off. A Grille B Shaft C Intake grille levers...
11. Installing the grille 2) Fixing the grille • Using 4 screws no. 2, attach the grille to the unit (ø14). • When installing the grille on the unit, tighten the screw with captive washer securely, allowing no gap between the unit and the grille, or between the grille and the surface of the ceiling.
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