Johnson Controls DHMW24NKB21S Owner'S Manual Download

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Owner's Manual

Air Conditioning Unit

"M" and "W" Series

24K

Mult

Zone

System

Cassette Type Indoor Unit

Model:

DHMW24NKB21S

Please read this

Installation and Operation

manual

carefully before

installation and

operation and retain it for

future reference

Summary of Contents for DHMW24NKB21S

Page 1: ...itioning Unit M and W Series 24K Multi Zone System Cassette Type Indoor Unit Model DHMW24NKB21S Please read this Installation and Operation manual carefully before installation and operation and retain it for future reference ...

Page 2: ...d advanced information to maintain and service this inverter driven cooling or heat pump air conditioning unit which you operate as well for other models This inverter driven cooling or heat pump air conditioning unit has been designed for a specific temperature range For optimum performance and long life operate this unit within range limits This manual should be considered as a permanent part of...

Page 3: ...ion of the Indoor Unit 2 3 2 4 Dimensions of Ceiling Opening and Location of Threaded Mounting Rod 3 4 4 5 2 8 Electrical wiring 7 9 3 Nomenclature of Cassette Type Indoor Unit 12 4 Working Temperature Range 13 5 Troubleshooting Malfunctions 14 16 16 18 Table of Contents Introduction and Safety Information i Support Contact Information 19 17 17 18 ...

Page 4: ...orrectly injuries may occur due to a falling unit Use appropriate Personal Protective Equipment PPE such as gloves and protective goggles and where appropriate have a gas mask nearby Also use electrical protection equipment and tools suited for electrical operation purposes Keep a quenching cloth and a fire extinguisher nearby during brazing Use care in handling rigging and setting of bulky equipm...

Page 5: ...sure the condensate hose discharges water properly If connected incorrectly it may cause leaks Do not install the unit in any place where oil can seep onto the units such as table or seating areas in restaurants and so forth For these locations or social venues use specialized units with oil resistant features built into them In addition use a specialized ceiling fan designed for restaurant use Th...

Page 6: ...son Controls Johnson Controls uses only refrigerants that have been approved for use in the unit s intended home country or market Johnson Controls distributors similarly are only authorized to provide refrigerants that have been approved for use in the countries or markets they serve The refrigerant used in this unit is identified on the unit s faceplate and or in the associated manuals Any addit...

Page 7: ...gas and liquid valves otherwise these devices will be damaged It is closed before shipment If the arrangement for outdoor units is incorrect it may cause flowback of the refrigerant and result in failure of the outdoor unit The refrigerant system may be damaged if the slope of the piping connection kit exceeds 15o Electrical Precautions Take the following precautions to reduce the risk of electric...

Page 8: ...nel to the indoor or outdoor units without turning OFF the main power supply After ceasing operation be sure to wait at least five minutes before turning off the main power switch Otherwise water leakage or electrical breakdown may result Disconnect the power source completely before attempting any maintenance for electrical parts Check to ensure that no residual voltage is present after disconnec...

Page 9: ...e different mode unit will display a different mode error and will not operate until mode is changed The cooling mode will not conflict with the dry mode and the fan mode will not conflict with any mode The outdoor unit disconnect should be installed within reach of the outdoor unit and at such a height for easy access Overcurrent protection is required UL 1995 CSAC22 2 The cooling range of the un...

Page 10: ...5 Select a location for the indoor unit taking into account routing of the condensate line and proximity to the outdoor unit 6 Make sure that there is enough space for care and maintenance Make sure that the weight between the indoor unit and ground is above 6 ft 1800mm 7 When installing the threaded mounting rod check if the installation location can withstand a weight four times that of the unit...

Page 11: ... surface boards Threaded mounting rod X4 33 Indoor unit 35 Ceiling opening 37 1 2 Decorated surface boards 26 3 4 Gaps between hoisting screw rods Fig 2 Installation Dimensions of Model DHMW24NKB21S The drilling of holes in the ceiling must be done by certified technicians Ceiling Installation stands for main body of the unit 6 1 4 Above 25 32 Fig 3 Note The dimensions for the ceiling openings wit...

Page 12: ...nting rod Refer to Fig 2 above 4 The unit must be level to operate correctly and to prevent water damage to ceiling and surroundings Condensate pump and float switch are included in the indoor unit 5 Slide out the gasket anchor board used to prevent the gasket from breaking off and tighten the nut on it 6 Remove the template Nut field supplied Washer accessory Washer anchor board attachment Bolt o...

Page 13: ...g completely Flare nut Torque wrench Fig 5 Table 1 Torque settings for various sizes of flare connections Diameter Inch Surface thickness mm Moment of torque N m φ1 4 0 5 10 15 φ3 8 0 71 25 32 φ1 2 1 36 48 φ5 8 1 51 62 φ3 4 1 70 86 If the specification of the outdoor unit pipe joint does not conform to that of the indoor unit then the joint specification of the outlet pipe of the indoor unit takes...

Page 14: ...ly clamped as described Fig 7 Drain Step up Pipe Note The installation height of the drain raising pipe should less than 11 in 280mm The condensate pipe riser should form a right angle with the unit and distance to unit should not be beyond 11 8 in 300mm Within 12 or less Condensate hose coupling Roof Condensate piping riser 8 1 2 or less 3 5 Hoisting stand 11 or less 19 1 2 or less Ceiling Clamp ...

Page 15: ...tallation Check drain operation by pouring water into unit and observing flow Further verify drain setup and correct flow by running all indoor units when system install is complete Fig 11 2 8 Electrical wiring Note The operating voltage of the indoor unit comes from the outdoor unit terminal block For information about the electrical wiring please see the wiring diagram included with the unit All...

Page 16: ...ttom of the appliance upward and then connect the power line and the communication line from the outdoor unit to the corresponding terminals N 1 2 3 and grounding terminal of the indoor unit Wiring must be done correctly as per the wiring diagram Note Be sure the wiring terminals A B C D and piping joints A B C D of the indoor unit match with that of the outdoor unit To indoor unit To indoor unit ...

Page 17: ...the two hooks and latches provided at opposing corners 1 Install the panel on the indoor unit temporarily When installing hang the latch on the hook that is located on the opposite side of the swing flap on the panel of the indoor unit 2 places 2 Hang the remaining two latches onto the hooks on the sides of the indoor unit Ensure there are no wires caught between the cassette chassis and the grill...

Page 18: ...le meets the finished ceiling 5 Once the grille is in place and tightened the sealing gasket of the grille should be compressed to approximately 1 4 to 1 8 of an inch Try to keep the gasket thickness as uniform as possible for best performance Latch Piping position Swing flap motor Indoor unit Ceiling Air outlet vent Decorative panel 5mm to 8mm Sealing material Hook Fig 13 ...

Page 19: ...needs to be adjusted lower for proper sealing of grille to chassis Corner adjustment s to lower the chassis if needed Gaps are not allowed Fig 15 Wiring of the cassette grille Fig 16 Once the grille is in place connect the plugs from the grille to the chassis These are for the discharge air louvers Again be sure no wiring or harnesses are pinched between the chassis and the grille assembly At body...

Page 20: ...Air outlet vent Air filter purifier in air inlet grille Air inlet grille Guide louver placed in air outlet vent Drainage equipment inside type Discharge condensate water from indoor unit when cooling Connecting pipe Drainage hose Fig 17 DHMW24NKB21S ...

Page 21: ...b temp Wet bulb temp Rated Cooling 80 0 26 7 67 0 19 4 95 0 35 0 75 0 23 9 Max cooling 80 0 26 7 67 0 19 4 115 0 46 1 75 0 23 9 Min cooling 67 0 19 4 57 0 13 9 67 0 19 4 57 0 13 9 Rated Heating 70 0 21 1 60 0 15 6 47 0 8 3 43 0 6 1 Max heating 80 0 26 7 75 0 23 9 65 0 18 3 Low Ambient heating 70 0 21 1 60 0 15 6 5 0 15 0 3 2 16 0 ...

Page 22: ...it Wireless remote must be within 26 ft Air conditioning unit runs but stops suddenly Blockage in inlet or outlet vent of indoor or outdoor unit Clean out blockage Abnormal cooling or heating Blockage in inlet or outlet vent of indoor or outdoor unit Clean out blockage Setpoint error Adjust settings in wireless remote controller Low fan speed Adjust settings in wireless remote controller Incorrect...

Page 23: ...W LV IORZLQJ WKURXJK WKH SLSLQJ DQG FRLOV Hissing sound heard when starting or stopping 1RUPDO HTXDOL DWLRQ RI SUHVVXUHV Slight hissing sound heard when running or after running UDLQ SXPS RU FRQGHQVDWH GUDLQ RSHUDWLRQ FRROLQJ Creaking sound heard when running or after running DQ EH FDXVHG E H SDQVLRQ DQG FRQWUDFWLRQ GXULQJ D KHDWLQJ F FOH HVSHFLDOO LI WKH VSDFH LV YHU FROG Dust blown from air cond...

Page 24: ...aise it and disassemble Then remove the three purifiers secured on the filter purifier Fig 18 Fig 19 3 Clean Use a mild cleaner or water to wash the filter If the filter is too dirty oil stain etc use warm water cooler than 113 F 45 with a degreaser to clean it Then dry it in the shade Note Do not clean the filter with hot water at a temperature higher than 113 F 45 to prevent fading or deformatio...

Page 25: ...o the first step above 6 Install the air filter Refer to the fourth step of Clean Air Filter above 7 Close the air inlet grille Refer to the first step of Clean Air Filter above 6 3 Installing and Changing Air Purifier 1 Open the air inlet grille Refer to the first step of Clean Air Filter above 2 Disassemble purifier As shown in Fig 22 disassemble the air filter and remove screws holding purifier...

Page 26: ...de louver is too dirty it may be removed to be cleaned As described below Disassembly and installation of guide louver 1 Disassemble the guide louver Loosen both guide louver screws Note Gently clean guide louver to prevent dispersing dust and irritants 2 Install guide louver Rotate the guide louver slightly to install the protruding edge of both ends into grooves on both ends of guide louver and ...

Page 27: ...19 ...

Page 28: ... Johnson Controls Inc USA LIT 12012209 Product improvement specifications and appearance in this manual are subject to change without prior notice ...

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