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Hitachi RAI-25NH5A Installation Manual Indoor unit ceiling cassette-unit air conditioner Hide thumbs Also See for RAI-25NH5A:

• Service manual (61 pages)
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• Manual (29 pages)

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• Table of Contents
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Table of Contents

• Safety Precaution
• Tools Needed for Installation Work
• The Choice of Mounting Site
• Names of Indoor Components
• Preparation for Installing Indoor Unit
• Installation of Suspension Bolts
• Drain Pipe Installation
• Installation of Indoor Unit
• Selecting the Mounting Position
• Connecting the Pipe to the Indoor Unit
• Procedures of Wiring
• Wiring of the Indoor Unit
• Preparation of Pipe
• Pipe Connection
• Removal of Air from the Pipe and Gas Leakage Inspection
• Procedures of Using Vacuum Pump for Air Removal
• Gas Leakage Inspection
• Insulation and Maintenance of Pipe Connection
• Installation of Remote Control
• Power Source and Operation Test

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Download this manual See also: Service Manual, Manual FOR SERVICE PERSONNEL ONLY HITACHI CEILING CASSETTE-UNIT AIR CONDITIONER INSTALLATION MANUAL RAI-25NH5A Indoor Unit HFC RAI-35NH5A R410A RAI-50NH5A

SAFETY PRECAUTION

● Read the safety precautions carefully before operating the unit. ● The contents of this section are vital to ensure safety. Please pay special attention to the following sign. ! WARNING ........ Incorrect methods of installation may cause death or serious injury. ! CAUTION ......... Improper installation may result in serious consequence. Be sure that the unit operates in proper condition after installation. Explain to customer the proper way of operating the unit as described in the user's guide. ! ● Please request your sales agent or qualified technician to install your unit. Water leakage, short circuit or fire may occur if you do the installation work yourself. ● Please observe the instructions stated in the installation manual during the process of installation. Improper installation may cause water leakage, electric shock and fire. ● Make sure that the units are mounted at locations which are able to provide full support to the weight of the units. If not, the units may collapse and impose danger. ● Observe the rules and regulations of the electrical installation and the methods described in the installation manual when dealing with the electrical work. Use power cables approved by the authorities of your country. ● Be sure to use specified wire for the connection indoor and outdoor units. Please ensure that the connections are tight after the conductors of the wire are inserted into the terminals. Improper insertion and loose contact may cause over-heating and fire. ● Please use the specified components for installation work. Otherwise, the units may collapse or water leakage, electric shock and fire may occur. ● Be sure to use the specified piping set for R-410A. Otherwise, this may result in broken copper pipes or faults. ● When installing or removing an air conditioner, only specified refrigerant (R410A) shall be allowed, do not allow air or moisture to remain in the refrigeration cycle. Otherwise, pressure in the refrigeration cycle may become abnormally high so that a rupture may be caused. ● Be sure to ventilate fully if a refrigerant gas leak while at work. If the refrigerant gas comes into contact with fire, a poisonous gas may occur. ● After completion of installation work, check to make sure that there is no refrigeration gas leakage. If the refrigerant gas leaks into the room, coming into contact with fire in the fan-driven heater, space heater, etc., a poisonous gas may occur. ● Unauthorized modifications to the air conditioner may be dangerous. If a breakdown occurs please call a qualified air conditioner technician or electrician. Improper repairs may result in water leakage, electric shock and fire, etc. ! ● A circuit breaker or fuse (16A time delay) must be installed. Without a circuit breaker or fuse the danger of electric shock exists. A main switch with a contact gap of more than 3.5mm has to be installed in the power supply line to the outdoor unit. ● Piping shall be suitable supported with a maximum spacing of 1m between the supports. ● Do not install the unit near a location where there is flammable gas. The outdoor unit may catch fire if flammable gas leaks around it. ● For installation of front panel RAI-ECPM, please follow exactly the instruction in the manual. ● Please ensure smooth flow of water when installing the drain hose. 1 Opening on ceiling and suspension bolt 650 (Panel) 600 (Opening on ceiling) 64 580 (Indoor unit) 400 (Suspension bolt) Narrow pipe Ø6.35 Panel (Optional part RAI-ECPM) Ceiling ● Need a connecting work for refrigerant pipe, drain pipe and F cable in the ceiling after suspending the indoor unit. Arrange drain pipe, refrigerant pipe and F cable in their installation position. ● For finishing of opening on ceiling, arrange with builder in detail. If ceiling is already completed, connecting cables between indoor and outdoor, piping and ● drain piping must be done before fitting indoor unit. 2

Preparation for installing indoor unit

Installation of suspension bolts

● Be sure to reinforce furring of ceiling (frame : ceiling joints and supporter) to maintain level of ceiling and prevent vibration of ceiling plate. ● Suspension bolts should be purchased in the field. ● Refer to diagrams shown below for length of suspension bolts. ● In case of wooden frame ● In case of steel frame Insert 980 ~ 1470N 60 ~ 90mm square piece of lumber 150 ~ 160mm (100 ~ 150kgf) Reinforcing bar Suspension bolt (M10) Nut Angle Angle Nut Angle Suspension bolt (M10) Ceiling Wall Penetration and Installation of Protection Pipe ● Drill a ø 65mm hole on wall which is slightly tilted towards the outdoor side. Drill the wall at a small angle. ● Cut the protection pipe according to the wall thickness. ● Empty gap in the sleeve of protection pipe should be completely sealed with putty to avoid dripping of rain water into the room. Indoor Outdoor Seal with putty 2 ~ 5mm Seal with putty Protection pipe Sleeve of protection pipe WALL

Drain pipe installation

● Use PVC pipe VP20 (O.D. 26mm) for drain pipe. ● Be sure to roll an insulation (thickness 10mm or more) for the drain pipe at indoor side. ● Always draw the drain pipe downward so that water flows smoothly. Fix it (ex. by hanger) to prevent a peak and trap. Downward 1/25 ~ 1/100 Seal Ditch Insulation (Thickness 10mm or more) < > IA370: A ● Carefully read through the procedures of proper installation before starting installation work. ● The sales agent should inform customers regarding the correct operation of installation.

Tools Needed For Installation Work

+ – Screwdriver ● ● Measuring Tape ● ● ø 65mm Power Drill Hexagonal Wrench Key ( ● ● Wrench (14, 17, 19, 22, 26, 27mm) Gas Leakage Detector ● ● ● Pipe Cutter Vinyl Tape Pliers WARNING CAUTION ● In case drain piping cannot be done smoothly due to obstacles, it can also be arranged outside of the main unit as shown in the drawing below. (Unit : mm) Use PVC pipe VP20 3

Installation of indoor unit

● Set nut and washer on suspension bolt and hook it to suspension clamp by lifting the indoor 97 (Drain) unit. 65 42 Drain outlet ● Suspension bolt must have play of 20-30 mm on its right and left. If cannot have enough Wide pipe Ø12.7 play, fix lifting lug to suspension bolt without attaching nut underneath the suspension bolt, then attach nut and install indoor unit. ● Make sure that indoor unit is kept level using a level. Air outlet Air inlet Air outlet The space between bottom surfaces of ceiling and indoor unit ● Be sure to install the indoor units as follow position (1). ● Do not install the indoor units as follows position (2) (3). (Unit : mm) (1) Same level (draw in 0~2mm) Bend slip- ● Be sure that bottom face preventive metal of indoor main unit is the C type same height (or expected metal Concrete height if the ceiling is new Long nut construction.) as lower Suspension surface of the ceiling. bolt (M10) Hanger bolt If constructing the ceiling after installation ● of air conditioner, be sure to attach a pattern paper for installation that shows ceiling opening dimension. H beam Suspension Suspension Pattern paper for bolt (M10) installation plate bolt (M10) Ceiling 610mm (Suspension bolt) PATTERN PAPER FOR INSTALLATION ! CAUTION Be sure that the wire is not Marking hole for opening on ceiling in contact with any metal in the wall. Please use the protection pipe as wire passing through the hollow part of the wall so as to prevent the possibility of 580mm (Indoor unit shape) damaged by mouse. 600mm (Opening on ceiling) ! WARNING NOTE Please using this pattern paper, decide the suspension Be sure to use protection pipe bolt. Position by putting this reverse side on ceiling surface. (commercial product). If connecting cables are touching Drawing of bottom view of ceiling metal lath inside the wall or inside the wall is hollow where mouse

Selecting the Mounting Position

can bite cables, it can cause The installation place is very important for the air conditioner because it is very difficult to electrical shock or fire. move from one place to another after the first installation. If sealing is not complete, high Decide the mounting position together with the customer. humid air from inside the wall or The discharge direction can be selected as shown below. outside of the room can come in and cause water dripping. Pipe 4 Directions Since 2-way outlet as shown below causes performance problems, do not set it. Trap No insulation Stagnant water

THE CHOICE OF MOUNTING SITE

● The unit should be mounted at stable, non-vibratory location which can provide full support to the unit. ● No nearby heat source and no obstruction near the air outlet is allowed. ● The clearance distances from top, right and left are specified in figure below. ● The location must be convenient for water drainage and pipe connection with the outdoor unit. ● To avoid interference from noise please place the unit and its remote controller at least 1m from the radio, television and inverter type fluorescent lamp. ● ● ● Knife Saw To avoid any error in signal transmission from the remote controller, please put the controller far away from high-frequency machines and high-power wireless systems. 4mm) ● The installation height of indoor unit must be 2.3m or more. ● Flare Tool

Names of Indoor Components

No. Item Insulation pipe for flare section 1 Binder 2 Holder for Remote Controller 3 AAA Size Battery 4 Screw for holder of Remote Controller 5 (3.1x16) Insulation pipe for drain pipe 6 Insulation pipe 7 Remote Controller 8 Pattern paper for positioning plate 11 Pattern paper for installation plate 12 Installation plate fixing screw 13 (M5 X 16) Blower cover 14 Corner Seal 16 150mm or less Downward pitch 1/25 ~ 1/100 Insulation (Thickness 10mm or more) VP20 VP20 Suspension bolt (M10) (Local purchase) Hexagon nut (M10) (Local purchase) Washer (Local purchase) Drawing of bottom view of ceiling Pattern paper for positioning plate 11 Indoor unit (2) Stick out above 0mm (3) Draw in above 3mm ! CAUTION ● Be sure to install the indoor unit level. If the indoor unit is inclined, water may leak. ● If space between bottom surfaces of indoor unit and ceiling is not correct, there may be a gap between the panel and indoor unit, with consequence dropping of condensed water.

Selecting the switch

Turn power off. 1 Remove cover of the electrical box. 2 When install the indoor unit 2500mm 3 or more from the floor, select the "STATIC PRESSURE SW" on the main Installation plate 12 13 fixing screw PWB to HIGH PRESSURE. When install the indoor unit below than 2500mm from the floor, select the "STATIC PRESSURE SW" on the main PWB to NORMAL. Center of indoor unit Fixing hole for panel Pipes Drain Pipe STATIC PRESSURE SW HIGH PRESSURE This is used for increasing fan speed according to the situation of the trial NORMAL operation inside the room with ceiling height of 2.5m and above. However noise gets slightly higher. 600mm or more 600mm or more 600mm or more 3 Directions 3 Directions 2 Directions ! CAUTION Pipe Pipe (Please note the following matters and obtain permission from customer before installation). ! WARNING CAUTION ! Qty 2 Air inlet Air Air outlet outlet 1000 mm 1000 mm 4 or more or more 1 2 Air inlet Air Air outlet outlet 1000 mm 1000 mm or more or more 2 1 Be sure to completely 1 seal any gap with putty. 1 1 1 4 RAI-50NH5A 2 No. Item Qty Insulator 3 17 1 Blower cover installation Install the blower cover only to the air outlet direction which is not in use. Install the blower cover at the diffuser position shown. Fix the blower cover certainly. Corner seal installation Install the corner seal at position shown. Fix the corner seal certainly. Shall be installed disregard to 2 directions, 3 directions or 4 directions. 2 direction example Corner seal 16 A Corner seal 16 A Selecting the switch Turn power off. 1 Remove cover of the electrical box. 2 When selecting discharge direction of 2 directions or 3 directions, select 3 the "AIR FLOW SELECTION" on the main PWB to 3 way. When selecting discharge direction of 4 directions, select the "AIR FLOW SELECTION" on the switch PWB to NORMAL. NOTE: During 2 directions or 3 directions, sound level will increase. Connecting the pipe 4

Connecting the pipe to the indoor unit

Remove the flare nut and seal cap. By loosening the flare nut at the pipe end, the refrigerant is discharged in a small amount. The arrangement has been made for shipment, and the discharge of refrigerant is never a trouble to the equipment. When the flare nut is removed, never fail to remove the seal cap. If not removed, the refrigerant will not be circulated, which result the compressor drive motor will possibly be burnt. Apply refrigerator oil to the union and the flared portion of the pipe. Wrap flare insulation, bind top and bottom flare insulation by binder. When connecting pipes, if flare nut is over-tightened at the small diameter side, the screw thread of the service valve may be broken making pipe connection impossible. Be sure to tighten the nut with specified torque. Flare nut Union Wrench Torque wrench Wrapping To be Insulation pipe for adhesion flare section Refrigerating pipes with insulation Indoor unit (purchased in the field) Binder 2 Insulation at indoor unit

Connecting of drain pipe

● Securely glue connection part of drain hose and PVC pipe, using PVC adhesive. ● If gluing of drain hose and PVC pipe is too weak, water leakage may occur. Be sure to wrap generally-available insulator (10mm or more of foamed polyethylene) around drain hose, inside the house, for insulation heat. ● Checking drain and water leakage. Perform after connecting power. ● If checking of drainage is omitted, water drop may occur. 1000mm or more Add water to water pan of indoor unit ● as shown below. ● Perform test running of drain pump to check drainage operation. ● Test run method Turn power on. 1 Remove cover of electric box and 2 set the drain pump test run switch 2 Directions to TEST. After checking the drainage, return 3 the switch to NORMAL. ! CAUTION ● If drain pump test run is right set to TEST, drain pump may malfunction. Figure showing the Installation of Indoor Unit. CAUTION ! • The installation height of indoor unit must be 2.3m or more. The indoor piping should be insulated with the enclosed insulation pipe. (If the insulator is insufficient, please use commersial products). 4 5 ● The difference in height between the indoor and 3 outdoor unit should be kept below 10m. ● The connecting pipe, no matter big or small, should all be insulated with insulation pipe and then wrapped with vinyl tape. (The insulator will deteriorate if it is not wrapped with tape). Drain Pipe Must be installed separately. Insulate indoor part of pipe to prevent condensation. Fit the blower cover. Blower cover 14 Corner seal 16 Blower cover A-A Section view 3WAY NORMAL AIR FLOW SELECTION ! CAUTION ! CAUTION ● The rubber strap used for fixing the insulator should not be tied with great force. Otherwise, this will damage heat insulation and causes water condensation. 1 Pipe Rubber strap tied with great force Indoor unit Insulation pipe To be adhesion (10mm or more of encroach (2 ~ 4mm) PVC adhesive foamed polyethylene) (purchased in the field) PVC pipe (purchased in the field) Insulation pipe for drain pipe 6 Evaporator Air outlet Water pan Pitcher (add water) TEST NORMAL DRAIN PUMP TEST SW Previous Page Next Page

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Summary of Contents for Hitachi RAI-25NH5A

• Page 1: Safety Precaution

  ● The sales agent should inform customers regarding the correct CAUTION operation of installation. HITACHI CEILING CASSETTE-UNIT AIR ● No nearby heat source and no obstruction near the air outlet is allowed. ● The clearance distances from top, right and left are specified in figure below.

• Page 2: Procedures Of Wiring

  Preparation of Pipe Pipe Connection Removal Of Air From The Pipe And Gas Leakage Inspection ● Use a pipe cutter to cut the copper pipe. Procedures of using Vacuum Pump for Air Removal ● Please be careful when bending the copper pipe. ●...

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Rai-35nh5aRai-50nh5a

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