Johnson Controls DHR18CSB21S, DHR36CSB21S, DHR24CSB21S, DHR30CSB21S, DHR42CSB21S Service Manual

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Page 1

Service

Manual

"R" SERIES

INVERTER-DRIVEN

AIR CONDITIONING UNITS

Type

OUTDOOR UNITS

Type

INDOOR UNITS

DUCT

Type

INDOOR UNITS

CASSETTE

Model

DHR18CSB21S DHR24CSB21S DHR30CSB21S DHR36CSB21S DHR42CSB21S DHR48CSB21S

Model

DHR18NDB21S

DHR24NDB21S

DHR30NDB21S DHR36NDB21S

DHR42NDB21S DHR48NDB21S

Model

DHR18NKB21S

DHR24NKB21S

DHR30NKB21S DHR36NKB21S

DHR42NKB21S DHR48NKB21S

Type

INDOOR UNITS

CEILING

Model

DHR18NCB21S

DHR24NCB21S

DHR30NCB21S DHR36NCB21S

DHR42NCB21S DHR48NCB21S

,03257$17

PLEASE READ AND

UNDERSTAND THIS MANUAL BEFORE USING THIS INVERTER-DRIVEN AIR CONDITIONING UNIT. THIS MANUAL FOR FUTURE REFERENCE.

KEEP

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Important Notice

● Johnson Controls, Inc. pursues a policy of continuing improvement in design and performance in its

products. As such, Johnson Controls, Inc. reserves the right to make changes at any time without prior notice.

● Johnson Controls, Inc. cannot anticipate every possible circumstance that might involve a potential hazard.

● This inverter air conditioning unit is designed for standard air conditioning applications only. Do not use

this unit for anything other than the purposes for which it was intended for.

● The installer and system specialist shall safeguard against leakage in accordance with local pipetter

and electrical codes. The following standards may be applicable, if local regulations are not available. International Organization for Standardization: (ISO 5149 or European Standard, EN 378). No part of this manual may be reproduced in any way without the expressed written consent of Johnson Controls, Inc.

● This inverter-driven (cooling or heat pump) air conditioning unit will be operated and serviced in the

United States of America and comes with all required Safety, Danger, and Caution, warnings.

● If you have questions, please contact your distributor or dealer.

● This manual provides common descriptions, basic and 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 specic

temperature range. For optimum performance and long life, operate this unit within range limits.

● This manual should be considered as a permanent part of the air conditioning equipment and should

remain with the air conditioning equipment.

Product Inspection upon Arrival

1. Upon receiving this product, inspect it for any damages incurred in transit. Claims for damage, either

apparent or concealed, should be led immediately with the shipping company.

2. Check the model number, electrical characteristics (power supply, voltage, and frequency rating), and any accessories to determine if they agree with the purchase order.

3. The standard utilization for this unit is explained in these instructions. Use of this equipment for purposes other than what it designed for is not recommended.

4. Please contact your local agent or contractor as any issues involving installation, performance, or

maintenance arise. Liability does not cover defects originating from unauthorized modications

performed by a customer without the written consent of Johnson Controls, Inc. Performing any mechanical alterations on this product without the consent of the manufacturer will render your warranty null and void.

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TABLE OF CONTENTS

SAFETY SUMMARY................................................................................................................................................... i

1 MODELS LIST ................................................................................................................................................. 1

1.1 Outdoor Unit ........................................................................................................................................ 1

1.2 Indoor Unit ........................................................................................................................................... 2

2 NOMENCLATURE .......................................................................................................................................... 3

3 PRODUCT DATA ............................................................................................................................................. 4

3.1 Product Data of Indoor Unit ............................................................................................................. 4

3.2 Operation Range ............................................................................................................................... 10

3.3 Electrical Data ................................................................................................................................... 10

4 PIPING DIAGRAM ........................................................................................................................................ 11

CONTROL.................................................................................................................................................................. 12

5 OPERATION FLOWCHART ........................................................................................................................ 12

5.1 Cooling/Dry Operation .................................................................................................................... 12

5.2 Heating Operation ............................................................................................................................ 13

6 WIRELESS REMOTE CONTROLLER ...................................................................................................... 14

6.1 Operation and Display View .......................................................................................................... 14

7 WIRED CONTROLLER ................................................................................................................................ 16

7.1 Display View ...................................................................................................................................... 16

7.2 Operation View .................................................................................................................................. 18

8 SPECIAL FUNCTIONS SETTINGS ........................................................................................................... 21

8.1 Setting of Filter Clean Reminder Function ................................................................................ 21

8.2 Low Temperature Drying Function .............................................................................................. 23

8.3 Lock Function ................................................................................................................................... 23

8.4 Memory Function.............................................................................................................................. 24

8.5 Door Control Function/Occupancy Function ........................................................................... 24

8.6 Switch between Fahrenheit and Celsius ................................................................................... 24

8.7 Ambient Temperature .................................................................................................................... 24

8.8 Error Code Recall ............................................................................................................................ 25

8.9 Programming Function ...................................................................................................................25

9 CENTRAL CONTROLLER ......................................................................................................................... 29

9.1 Smart Zone Controller .................................................................................................................... 29

9.2 Additional Special Functions ....................................................................................................... 33

MAINTENANCE ..................................................................................................................................................... 41

10 ERROR CODES........................................................................................................................................... 41

10.1 Main Control Malfunction ............................................................................................................. 41

10.2 Description of Drive Malfunction ............................................................................................... 44

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TABLE OF CONTENTS (cont'd)

11 FLOW CHART FOR TROUBLESHOOTING ........................................................................................... 45

11.1 Troubleshooting Flow Chart of Main Control Malfunction .................................................. 45

11.2 Troubleshooting Flow Chart of Drive Malfunction................................................................. 52

11.3 Interface ............................................................................................................................................ 57

11.4 IPM, PFC Testing Method ............................................................................................................ 63

12 DISASSEMBLY AND ASSEMBLY PROCEDURES FOR MAIN PARTS...........................................65

12.1 Outdoor Unit .................................................................................................................................... 65

12.2 Indoor Unit....................................................................................................................................... 69

CUSTOMER SUPPORT................................................................................................................................... 83

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1. Introduction

This manual concentrates on inverter-driven cooling or heat pump air conditioning units. Read this manual carefully before installation.

This manual should be considered as a permanent part of the air conditioning equipment and should remain with the air conditioning equipment.

2. Important Safety Instructions

Safety Messages

Indicates a hazardous situation that, if not avoided, could result in death or serious injury.

Indicates a hazardous situation that, if not avoided, could result in minor or

moderate injury.

Indicates information considered important, but not hazard-related (for example, messages relating to property damage).

General Precautions

To reduce the risk of serious injury or death, read these instructions thoroughly and follow all warnings or cautions included in all manuals that accompanied the product and are attached to the unit. Refer back to these

safety instructions as needed.

● This system should be installed by personnel certied by Johnson Controls, Inc. Personnel must be qualied according to local, state and national building and safety codes and regulations. Incorrect installation could cause leaks, electric shock, re or explosion. In areas where Seismic ‘’Performance requirements are specied, the appropriate measures should be taken during installation to guard against

possible damage or injury that might occur in an earthquake if the unit is not installed correctly, 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 re extinguisher nearby during brazing.

Use care in handling, rigging, and setting of bulky equipment.

● When transporting, be careful when picking up, moving and mounting these units. Although the unit may be packed using plastic straps, do not use them for transporting the unit from one location to another. Do not stand on or put any material on the unit. Get a partner to help, and bend with your knees when lifting

to reduce strain on your back. Sharp edges or thin aluminum ns on the air conditioner can cut ngers,

so wear protective gloves.

● Do not touch or adjust any safety devices inside the indoor or outdoor units. All safety features, disengagement, and interlocks must be in place and functioning correctly before the equipment is put into operation. If these devices are improperly adjusted or tampered with in any way, a serious accident can occur. Never bypass or jump-out any safety device or switch.

● Johnson Controls, Inc. will not assume any liability for injuries or damage caused by not following steps outlined or described in this manual. Unauthorized modications to Johnson Controls products are

prohibited as they…

◦ May create hazards which could result in death, serious injury or equipment damage. ◦ Will void product warranties. ◦ May invalidate product regulatory certications. ◦ May violate OSHA standards.

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Take the following precautions to reduce the risk of property damage.

● Be careful that moisture, dust, or variant refrigerant compounds not enter the refrigerant cycle during

installation work. Foreign matter could damage internal components or cause blockages.

● If air lters are required on this unit, do not operate the unit without the air lter set in place. If the air lter is not installed, dust may accumulate and breakdown may result.

● Do not install this unit in any place where silicon gases can coalesce. If the silicon gas molecules attach themselves to the surface of the heat exchanger, the nned surfaces will repel water. As a result, any amount of condensate can overow from the condensate pan and could run inside of the

electrical box, possibly causing electrical failures.

● When installing the unit in a hospital or other facility where electromagnetic waves are generated from nearby medical and/or electronic devices, be prepared for noise and electronic interference Electromagnetic Interference (EMI). Do not install where the waves can directly radiate into the electrical box, controller cable, or controller. Inverters, appliances, high-frequency medical equipment, and radio communications equipment may cause the unit to malfunction. The operation of the unit may also adversely affect these same devices. Install the unit at least 10 ft. (approximately 3m) away from such devices.

● When a wireless zone controller is used, locate at a distance of at least 3.3 ft. (approximately 1 meter) between the indoor unit and electric lighting. If not, the receiver part of the unit may have difculty

receiving operation commands.

● Do not install the unit in any location where animals and plants can come into direct contact with the outlet air stream. Exposure could adversely affect the animals and plants.

● Do not install the unit with any downward slope to the side of the drain boss. If you do, you may have water owing back which may cause leaks.

● Be 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. These specialized oil-resistant units can be ordered for such applications. However, in places where large quantities of oil can splash onto the unit, such as a factory, even the specialized units cannot be used. These products should not be installed in such locations.

Installation Precautions

To reduce the risk of serious injury or death, the following installation

precautions must be followed.

● When installing the unit into… ▫ A wall: Make sure the wall is strong enough to hold the unit’s weight. It may be necessary to

construct a strong wood or metal frame to provide added support.

▫ A room: Properly insulate any refrigerant tubing run inside a room to prevent “sweating” that can

cause dripping and water damage to wall and oors.

▫ Damp or uneven areas: Use a raised concrete pad or concrete blocks to provide a solid, level

foundation for the unit to prevent water damage and abnormal vibration.

▫ An area with high winds: Securely anchor the outdoor unit down with bolts and a metal frame.

Provide a suitable air bafe.

▫ A snowy area (only for heat pump model): Install the outdoor unit on a raised platform that is

higher than drifting snow. Provide snow vents.

● Do not install the unit in the following places. Doing so can result in an explosion, re, deformation,

corrosion, or product failure.

▫ Explosive or ammable atmosphere ▫ Where re, oil, steam, or powder can directly enter the unit, such as in close proximity or directly

above a kitchen stove.

▫ Where oil (including machinery oil) may be present. ▫ Where corrosive gases such as chlorine, bromine, or sulde can accumulate, such as near a hot

tub or hot spring.

▫ Where dense, salt-laden airow is heavy, such as in coastal regions. ▫ Where the air quality is of high acidity. ▫ Where harmful gases can be generated from decomposition.

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● Do not position the condensate pipe for the indoor unit near any sanitary sewers where corrosive gases may be present. If you do, toxic gases can seep into breathable air spaces and can cause respiratory injuries. If the condensate pipe is installed incorrectly, water leakage and damage to the

ceiling, oor, furniture, or other possessions may result. If condensate piping becomes clogged,

moisture can back up and can drip from the indoor unit. Do not install the indoor unit where such dripping can cause moisture damage or uneven locations: Use a raised concrete pad or concrete blocks to provide a solid, level foundation for the unit to prevent water damage and abnormal vibration.

● Before performing any brazing work, be sure that there are no ammable materials or open ames nearby.

● Perform a run test to ensure normal operation. Safety guards, shields, barriers, covers, and protective devices must be in place while the compressor/unit is operating. During the test run, keep ngers and

clothing away from any moving parts.

● Clean up the site when nished, remembering to check that no metal scraps or bits of wiring have

been left inside the unit being installed.

● During transportation, do not allow the backrest of the forklift to make contact with the unit, otherwise, it may cause damage to the heat exchanger and also may cause injury when stopped or started suddenly.

● Remove gas inside the closing pipe when the brazing work is performed. If the brazing ller metal is

melted with remaining gas inside, the pipes will be blown off and it may cause injury.

● Be sure to use nitrogen gas for an airtight test. If other gases such as oxygen gas, acetylene gas or uorocarbon gas are accidentally used, it may cause explosion or gas intoxication.

After installation work for the system has been completed, explain the “Safety Precautions,” the proper use and maintenance of the unit to the customer according to the information in all manuals that came with the system. All manuals and warranty information must be given to the user or left near the Indoor Unit.

Refrigerant Precautions

To reduce the risk of serious injury or death, the following refrigerant

precautions must be followed.

● As originally manufactured, this unit contains refrigerant installed by Johnson 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 identied on the unit’s faceplate and/or in the associated manuals. Any additions of refrigerant into this unit must comply with the country’s requirements with regard to refrigerant use and should be

obtained from Johnson Controls distributors. Use of any non-approved refrigerant substitutes will void the warranty and will increase the potential risk of injury or death.

● If installed in a small room, take measures to prevent the refrigerant from exceeding the maximum

allowable concentration in the event that refrigerant gases should escape. Refrigerant gases can cause asphyxiation (0.42 kg/m3 based on ISO 5149 for R410A). Consult with your distributor for countermeasures (ventilation system and so on). If refrigerant gas has leaked during the installation work, ventilate the room immediately.

● The design pressure for this product is 601 psi (4.15MPa). The pressure of R410A refrigerant is 1.4

times higher than that of the refrigerant R22. Therefore, the refrigerant piping for R410A shall be

thicker than that for R22. Make sure to use the specified refrigerant piping. If not, the refrigerant piping may rupture due to an excessive refrigerant pressure. Besides, pay attention to the piping

thickness when using copper refrigerant piping. The thickness of copper refrigerant piping differs depending on its material.

● The refrigerant R410A is adopted. The refrigerant oil tends to be affected by foreign matters such

as moisture, oxide lm, (or fat). Perform the installation work with care to prevent moisture, dust, or

different refrigerant from entering the refrigerant cycle. Foreign matter can be introduced into the cycle from such parts as expansion valve and the operation may be unavailable.

● To avoid the possibility of different refrigerant or refrigerant oil being introduced into the cycle, the

sizes of the charging connections have been changed from R407C type and R22 type. It is necessary to prepare the appropriate tools before performing the installation work.

● Use refrigerant pipes and joints which are approved for use with R410A.

● A compressor/unit comprises a pressurized system. Never loosen threaded joints while the system is

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under pressure and never open pressurized system parts.

● Before installation is complete, make sure that the refrigerant leak test has been performed. If

refrigerant gases escape into the air, turn OFF the main switch, extinguish any open ames and

contact your service contractor. Refrigerant (Fluorocarbon) for this unit is odorless. If the refrigerant

should leak and come into contact with open ames, toxic gas could be generated. Also, because the uorocarbons are heavier than air, they settle to the oor, which could cause asphyxiation.

● When installing the unit, and connecting refrigerant piping, keep all piping runs as short as

possible, and make sure to securely connect the refrigerant piping before the compressor starts operating. If the refrigerant piping is not connected and the compressor activates with the stop valve opened, the refrigerant cycle will become subjected to extremely high pressure, which can

cause an explosion or re.

● Tighten the are nut with a torque wrench in the specied manner. Do not apply excessive force to the

are nut when tightening. If you do, the are nut can crack and refrigerant leakage may occur.

● When maintaining, relocating, and disposing of the unit, dismantle the refrigerant piping after the

compressor stops.

● When pipes are removed out from under the piping cover, after the insulation work is completed,

cover the gap between the piping cover and pipes by a packing (eld-supplied). If the gap is not

covered, the unit may be damaged if snow, rain water or small animals enter the unit.

● Do not apply an excessive force to the spindle valve at the end of opening. Otherwise, the spindle

valve ies out due to refrigerant pressure. At the run test, fully open the 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 owback 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 shock, re or

explosion resulting in serious injury or death.

● Highly dangerous electrical voltages are used in this system. Carefully refer to the wiring diagram

and these instructions when wiring. Improper connections and inadequate grounding can cause serious injury or death.

● Perform all electrical work in strict accordance with this installation and maintenance manual and all

the relevant regulatory standards.

● Before servicing, open and tag all disconnect switches. Never assume electrical power is

disconnected. Check with meter and equipment.

● Only use electrical protection equipment and tools suited for this installation.

● Use specied cables between units.

● The new air conditioner may not function normally in the following instances:

▫ If electrical power for the new air conditioner is supplied from the same transformer as the device*

referred to below.

▫ If the power source cables for this device* and the new air conditioner unit are located in close

proximity to each other.

Device*: (Example): A lift, container crane, rectier for electric railway, inverter power

device, arc furnace, electric furnace, large-sized induction motor and large-sized switch.

Regarding the cases mentioned above, surge voltage may be inducted into the power supply cables for the packaged air conditioner due to a rapid change in power consumption of the device and an activation of a switch.

Check eld regulations and standards before performing electrical work in order to protect the

power supply for the new air conditioner unit.

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● Communication cabling shall be a minimum of 18-Gauge, 2-Conductor, Stranded Copper. Shielded

cable must be considered for applications and routing in areas of high EMI and other sources of potentially excessive electrical noise to reduce the potential for communication errors. When shielded cabling is applied, proper bonding and termination of the cable shield is required as per Johnson Controls guidelines. Plenum and riser ratings for communication cables must be considered per application and local code requirments.

● Use an exclusive power supply for the air conditioner at the unit’s rated voltage.

● Be sure to install circuit breakers (ground fault interrupter, isolating switch, molded case circuit

breaker and so on), with the specied capacity. Ensure that the wiring terminals are tightened securely to recommended torque specications.

● Clamp electrical wires securely with a cable clamp after all wiring is connected to the terminal block.

In addition, run wires securely through the wiring access channel.

● When installing the power lines, do not apply tension to the cables. Secure the suspended cables at

regular intervals, but not too tightly.

● Make sure that the terminals do not come into contact with the surface of the electrical box. If the

terminals are too close to the surface, it may lead to failures at the terminal connection.

● Turn OFF and disconnect the unit from the power source when handling the service connector. Do not

open the service cover or access panel to the indoor or outdoor units without turning OFF the main power supply.

● After ceasing operation, be sure to wait at least ve 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 disconnecting the power source.

● Do not clean with, or pour water into, the controller as it could cause electric shock and/or damage the

unit. Do not use strong detergent such as a solvent. Clean with a soft cloth.

● Check that the ground wire is securely connected. Do not connect ground wiring to gas piping, water

piping, lighting conductor, or telephone ground wiring.

● If a circuit breaker or fuse is frequently activated, shut down the system and contact your

service contractor.

● Perform all electrical work in accordance with this manual and in compliance with all regulations and

safety standards.

● Do not open a service access cover or panel of an indoor or outdoor unit without rst turning OFF the

power at the main power supply.

● Residual voltage can cause electric shock. At all times, check for residual voltage after disconnecting

from the power source before starting work on the unit.

● This equipment can be installed with a Ground Fault Circuit Breaker (GFCI), which is a recognized

measure for added protection to a properly grounded unit. Install appropriate sized breakers/fuses/ overcurrent protection switches, and wiring in accordance with local, state and NEC codes and requirements. The equipment installer is responsible for understanding and abiding by applicable codes and requirements.

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PRODUCT

1 MODELS LIST

1.1 Outdoor Unit

Service Manual

Model Name

DHR18CSB21S 208/230V~60Hz

DHR24CSB21S 208/230V~60Hz

DHR30CSB21S 208/230V~60Hz

DHR36CSB21S 208/230V~60Hz

Power Supply

(V, Ph, Hz)

Appearance

DHR42CSB21S 208/230V~60Hz

DHR48CSB21S 208/230V~60Hz

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Service Manual

Type

Model Name

Duct

Type

Cassette

Type

Ceiling

Type

1.2 Indoor Unit

Nominal Capacity

Cooling/Heating

(Btu/h)

DHR18NDB21S 17100/18800 208/230V~60Hz

DHR24NDB21S 23800/27200 208/230V~60Hz

DHR30NDB21S 28200/31200 208/230V~60Hz

DHR36NDB21S 34000/41000 208/230V~60Hz

DHR42NDB21S 39500/44000 208/230V~60Hz

DHR48NDB21S

48000/54500 208/230V~60Hz

Power Supply

(V, Ph, Hz)

Appearance

DHR18NKB21S 17100/18400 208/230V~60Hz

DHR24NKB21S 23800/27200 208/230V~60Hz

DHR30NKB21S 28200/31200 208/230V~60Hz

DHR36NKB21S 34000/41000 208/230V~60Hz DHR42NKB21S 39500/44000 208/230V~60Hz

DHR48NKB21S 48000/54500 208/230V~60Hz

DHR18NCB21S 17100/19100 208/230V~60Hz

DHR24NCB21S 23800/27200 208/230V~60Hz DHR30NCB21S 28200/31200 208/230V~60Hz

DHR36NCB21S 34000/41000 208/230V~60Hz DHR42NCB21S 39500/44000 208/230V~60Hz

Note: This series allows the customer to choose any of the three types of indoor units to match up with the outdoor equipment.

DHR48NCB21S 48000/54500 208/230V~60Hz

Note: 1 Ton =12000Btu/h = 3.517kW

Page 12

2 Nomenclature

Service Manual

Page 13

Service Manual

Model

Indoor unit

Outdoor unit

Capacity

Cooling Capacity

Btu/h

17100(5400~19800)

23800(7400~29000)

28200(8200~29600)

Heating Capacity

Btu/h

18800(4700~23200)

27200(8200~32400)

31200(8200~33600)

Power Input

Cooling

1.55(0.55~1.75)

2.23(0.85~2.50)

3.30(0.85~3.70)

Heating

1.65(0.50~1.90)

2.36(0.80~2.75)

3.10(0.80~3.50)

SEER / HSPF

(Btu/h)/W

16.00/9.50

16.00/9.00

Indoor Unit

Power Supply

V/Ph/Hz

Cross Fin Coil

Fan

Drive

Direct

Motor Output

0.06×1

0.15×1

Air Flow

m3/h(CFM)

1000(585)

1400(820)

Rated Ext. Static

Pressure

Pa(InWg)

25(0.1)

37(0.15)

Ext. Static Pressure

Range

Pa(InWg)

0~30(0~0.12)

0~75(0~0.3)

Sound Pressure Level(SS/H/M/L)

dB(A)

40/39/36/28

47/46/44/40

Air Filter

PPKZ

mm(inch)

Φ30×1.5

(φ1.18×0.06)

Φ20×1.2

(φ0.79×0.05)

Φ20×1.2

(φ0.79×0.05)

Outline Dimensions (W×H×D)

(inch)

1037×266×721

(40.8×10.5×28.4)

1279×268×558

(50.4×10.6×22.0)

1279×268×558

(50.4×10.6×22.0)

Net Weight

kg(lb)

33.0(72.8)

34.0(75.0)

35.0(77.2)

Outdoor Unit

Power Supply

V/Ph/Hz

Cross Fin Coil

Compressor

Type

Rotary

Power Input

1440

2550

Control

Electronic Expansion

Valve

Electronic Expansion

Valve

Electronic Expansion

Valve

Charge

kg(oz)

1.4(49.4)

2.2(77.6)

2.4(84.7)

Outline Dimensions (W×H×D)

mm(inch)

955×700×396

(37.6×27.6×15.6)

980×790×427

(38.6×31.1×16.8)

980×790×427

(38.6×31.1×16.8)

Net Weight

kg(lb)

48.0(105.8)

69.0(152.1)

72.0(158.8)

Piping

Connections

Liquid

Inch

Φ1/4

Φ3/8

Gas

Inch

Φ1/2

Φ5/8

Max. Length

m(ft)

20(65.6)

30(98.4)

Max. Height

m(ft)

15(49.2)

3 PRODUCT DATA

3.1 Product Data of Indoor Unit

3.1.1 Duct Type

DHR18NDB21S DHR24NDB21S DHR30NDB21S

DHR18CSB21S DHR24CSB21S DHR30CSB21S

Heat Exchanger

Condensate Piping

Heat Exchanger

DHR18NDB21S DHR24NDB21S DHR30NDB21SI

208/230V1Ph~60Hz 208/230V1Ph~60Hz 208/230V1Ph~60Hz

DHR18CSB21S DHR24CSB21S DHR30B21S

208/230V1Ph~60Hz 208/230V1Ph~60Hz 208/230V1Ph~60Hz

Refrigerant

R410A

Page 14

Service Manual

Model

Indoor unit

Outdoor unit

Capacity

Cooling Capacity

Btu/h

34000(10800~39000)

39500(12000~42500)

48000(20400~49500)

Heating Capacity

Btu/h

41000(9800~49500)

44000(13000~52500)

54500(17500~58000)

Power Input

Cooling

3.28(0.70~4.50)

4.15(0.65~4.70)

5.15(1.40~5.60)

Heating

3.75(0.70~4.60)

3.90(0.76~4.75)

5.15(1.30~5.50)

SEER / HSPF

(Btu/h)/W

16.00/9.00

Indoor Unit

Power Supply

V/Ph/Hz

Cross Fin Coil

Fan

Drive

Direct

Motor Output

0.25×1

0.56×1

Air Flow

m3/h(CFM)

2000(1175)

2500(1470)

Rated Ext. Static

Pressure

Pa(InWg)

37(0.15)

50(0.2)

Ext. Static Pressure

Range

Pa(InWg)

0~100(0~0.4)

0~125(0~0.5)

Sound Pressure Level(SS/H/M/L)

dB(A)

53/52/48/44

55/53/49/45

Air Filter

PPKZ

mm(inch)

Φ20×1.2

(φ0.79×0.05)

Φ20×1.2

(φ0.79×0.05)

Φ20×1.2

(φ0.79×0.05)

Outline Dimensions (W×H×D)

(inch)

1226×290×775

(48.3×11.4×30.5)

1226×290×775

(48.3×11.4×30.5)

1340×350×750

(52.8×13.8×29.5)

Net Weight

kg(lb)

46.0(101.4)

56.0(123.5)

Outdoor Unit

Power Supply

V/Ph/Hz

Cross Fin Coil

Compressor

Type

Rotary

Power Input

4150

4580

Control

Electronic Expansion

Valve

Electronic Expansion

Valve

Electronic Expansion

Valve

Charge

kg(oz)

3.5(123.5)

3.7(130.5)

4.0(141.1)

Outline Dimensions (W×H×D)

mm(inch)

1107×1100×440

(43.6×43.3×17.3)

958×1349×412

(37.7×53.1×16.2)

958×1349×412

(37.7×53.1×16.2)

Net Weight

kg(lb)

93.0(205.1)

95.0(209.5)

105.0(231.5)

Piping

Connections

Liquid

Inch

Φ3/8

Gas

Inch

Φ5/8

Max. Length

m(ft)

30(98.4)

50(164.0)

Max. Height

m(ft)

15(49.2)

30(98.4)

Heat Exchanger

DHR36NDB21S DHR42NDB21S

DHR36CSB21S DHR42CSB21S DHR48CSB21S

DHR36NDB21S DHR42NDB21S DHR48NDB21S

208/230V1Ph~60Hz 208/230V1Ph~60Hz 208/230V1Ph~60Hz

DHR48NDB21SI

Refrigerant

R410A

Condensate Piping

DHR36CSB21S DHR42CSB21S DHR48CSB21S

208/230V1Ph~60Hz 208/230V1Ph~60Hz 208/230V1Ph~60Hz

Heat Exchanger

Page 15

Service Manual

Model

Indoor unit

Outdoor unit

Capacity

Cooling Capacity

Btu/h

17100(5400~18700)

23800(8200~29000)

28200(8800~31400)

Heating Capacity

Btu/h

18400(4700~22200)

27200(8200~32400)

31200(8200~33600)

Power Input

Cooling

1.70(0.55~1.75)

2.23(0.85~2.50)

2.70(0.85~3.70)

Heating

1.80(0.50~1.90)

2.36(0.80~2.75)

2.50(0.80~3.50)

SEER / HSPF

(Btu/h)/W

16.00/9.50

16.00/9.00

17.00/9.00

Indoor Unit

Power Supply

V/Ph/Hz

Cross Fin Coil

Fan

Drive

Direct

Motor Output

0.045×1

0.075×1

Air Flow

m3/h(CFM)

760(445)

1300(765)

1500(880)

Sound Pressure Level(SS/H/M/L)

dB(A)

47/46/44/37

47/46/42/38

49/48/45/40

Air Filter

ABS+PP

mm(inch)

Φ25×1.5

(φ0.98×0.06)

Φ25×1.5

(φ0.98×0.06)

Φ25×1.5

(φ0.98×0.06)

Outline Dimensions (W×H×D)

mm(inch)

665×240×596

(26.2×9.4×23.5)

917×240×840

(36.1×9.4×33.1)

917×320×840

(36.1×12.6×33.1)

Net Weight

kg(lb)

20.0(44.1)

27.0(59.5)

32.0(70.6)

Outdoor Unit

Power Supply

V/Ph/Hz

Cross Fin Coil

Compressor

Type

Rotary

Power Input

1440

2550

Control

Electronic

Expansion Valve

Electronic

Expansion Valve

Electronic

Expansion Valve

Charge

kg(oz)

1.4(49.4)

2.2(77.6)

2.4(84.7)

Outline Dimensions (W×H×D)

mm(inch)

955×700×396

(37.6×27.6×15.6)

980×790×427

(38.6×31.1×16.8)

980×790×427

(38.6×31.1×16.8)

Net Weight

kg(lb)

48.0(105.8)

69.0(152.1)

72.0(158.8)

Piping

Connections

Liquid

Inch

Φ1/4

Φ3/8

Gas

Inch

Φ1/2

Φ5/8

Max. Length

m(ft)

20(65.6)

30(98.4)

Max. Height

m(ft)

15(49.2)

3.1.2 Cassette Type

Heat Exchanger

Condensate Piping

DHR18NKB21S DHR24NKB21S

DHR18CSB21S DHR24CSB21S DHR30CSB21S

DHR18NKB21S DHR24NKB21S DHR30NKB21S

208/230V1Ph~ 60Hz 208/230V1Ph~ 60Hz 208/230V1Ph~ 60Hz

DHR30NKB21S

Heat Exchanger

Refrigerant

R410A

DHR18CSB21S DHR24CSB21S DHR30CSB21S

208/230V1Ph~ 60Hz 208/230V1Ph~ 60Hz 208/230V1Ph~ 60Hz

Page 16

Service Manual

Model

Indoor unit

Outdoor unit

Capacity

Cooling Capacity

Btu/h

34000(10800~39000)

39500(11000~41000)

48000(20400~50500)

Heating Capacity

Btu/h

41000(9800~49500)

44000(12000~51000)

54500(17500~61500)

Power Input

Cooling

3.28(0.75~4.50)

4.40(0.53~4.65)

5.50(1.30~5.70)

Heating

3.75(0.60~4.80)

4.45(0.64~4.80)

4.80(1.20~5.40)

SEER / HSPF

(Btu/h)/W

16.00/9.00

Indoor Unit

Power Supply

V/Ph/Hz

Cross Fin Coil

Fan

Drive

Direct

Motor Output

0.075×1

0.1×1

Air Flow

m3/h(CFM)

1860(1095)

2300(1350)

Sound Pressure Level(SS/H/M/L)

dB(A)

51/49/46/43

53/52/47/41

Air Filter

ABS+PP

mm(inch)

Φ25×1.5

(φ0.98×0.06)

Φ25×1.5

(φ0.98×0.06)

Φ25×1.5

(φ0.98×0.06)

Outline Dimensions (W×H×D)

mm(inch)

917×320×840

(36.1×12.6×33.1)

917×320×840

(36.1×12.6×33.1)

910×290×910

(35.8×11.4×35.8)

Net Weight

kg(lb)

32.0(70.6)

43.0(94.8)

Outdoor Unit

Power Supply

V/Ph/Hz

Cross Fin Coil

Compressor

Type

Rotary

Power Input

4150

4580

Control

Electronic

Expansion Valve

Electronic

Expansion Valve

Electronic

Expansion Valve

Charge

kg(oz)

3.5(123.5)

3.7(130.5)

4.0(141.1)

Outline Dimensions (W×H×D)

mm(inch)

1107×1100×440

(43.6×43.3×17.3)

958×1349×412

(37.7×53.1×16.2)

958×1349×412

(37.7×53.1×16.2)

Net Weight

kg(lb)

93.0(205.1)

95.0(209.5)

105.0(231.5)

Piping

Connections

Liquid

Inch

Φ3/8

Gas

Inch

Φ5/8

Max. Length

m(ft)

30(98.4)

50(164.0)

Max. Height

m(ft)

15(49.2)

30(98.4)

Heat Exchanger

Condensate Piping

DHR36NKB21S DHR42NKB21S

DHR36CSB21S DHR42CSB21S DHR48CSB21S

DHR36NKB21S DHR42NKB21S DHR48NKB21S

208/230V1Ph~ 60Hz 208/230V1Ph~ 60Hz 208/230V1Ph~ 60Hz

DHR48NKB21S

Heat Exchanger

Refrigerant

R410A

DHR36CSB21S DHR42CSB21S DHR48CSB21S

208/230V1PH~ 60Hz 208/230V1Ph~ 60Hz 208/230V1Ph~ 60Hz

Page 17

Service Manual

Model

Indoor unit

Outdoor unit

Capacity

Cooling Capacity

Btu/h

17100(5400~19800)

23800(8200~27800)

28200(8800~31400)

Heating Capacity

Btu/h

19100(4700~23200)

27200(8200~30600)

31200(8200~33600)

Power Input

Cooling

1.55(0.55~1.75)

2.23(0.85~2.50)

2.40(0.85~3.70)

Heating

1.55(0.50~1.90)

2.36(0.80~2.75)

2.60(0.80~3.50)

SEER / HSPF

(Btu/h)/W

17.00/9.50

16.00/9.00

17.00/9.00

Indoor Unit

Power Supply

V/Ph/Hz

Cross Fin Coil

Fan

Drive

Direct

Motor Output

0.06×1

0.15×1

Air Flow

m3/h(CFM)

1000(585)

1200(705)

1500(880)

Sound Pressure Level(SS/H/M/L)

dB(A)

44/42/38/32

49/48/46/40

49/46/44/38

Air Filter

mm(inch)

Φ17×1.75

(φ0.67×0.07)

Φ17×1.75

(φ0.67×0.07)

Φ17×1.75

(φ0.67×0.07)

Outline Dimensions (W×H×D)

mm(inch)

1220×225×700

(48.0×8.9×27.6)

1220×225×700

(48.0×8.9×27.6)

1420×245×700

(55.9×9.6×27.6)

Net Weight

kg(lb)

39.0(86.0)

40.0(88.2)

48.0(105.8)

Outdoor Unit

Power Supply

V/Ph/Hz

Cross Fin Coil

Compressor

Type

Rotary

Power Input

1440

2550

Control

Electronic Expansion

Valve

Electronic Expansion

Valve

Electronic Expansion

Valve

Charge

kg(oz)

1.4(49.4)

2.2(77.6)

2.4(84.7)

Outline Dimensions (W×H×D)

mm(inch)

955×700×396

(37.6×27.6×15.6)

980×790×427

(38.6×31.1×16.8)

980×790×427

(38.6×31.1×16.8)

Net Weight

kg(lb)

48.0(105.8)

69.0(152.1)

72.0(158.8)

Piping

Connections

Liquid

Inch

Φ1/4

Φ3/8

Gas

Inch

Φ1/2

Φ5/8

Max. Length

m(ft)

20(65.6)

30(98.4)

Max. Height

m(ft)

15(49.2)

3.1.3 Floor-ceiling Type

Heat Exchanger

DHR18NCB21S DHR24NCB21S DHR30NCB21S

DHR18CSB21S DHR24CSB21S DHR30CSB21S

DHR18NCB21S DHR24NCB21S DHR30NCB21S

208/230V1Ph~ 60Hz 208/230V1Ph~ 60Hz 208/230V1Ph~ 60Hz

Condensate Piping

Heat Exchanger

Refrigerant

R410A

DHR18CSB21S DHR24CSB21S DHR30CSB21S

208/230V1Ph~ 60Hz 208/230V1Ph~ 60Hz 208/230V1Ph~ 60Hz

Page 18

Model

Indoor unit

Outdoor unit

Capacity

Cooling Capacity

Btu/h

34000(10800~39000)

39500(12000~42500)

48000(20400~50500)

Heating Capacity

Btu/h

41000(9800~49500)

44000(13000~52500)

54500(17500~61500)

Power Input

Cooling

3.28(0.80~4.60)

4.05(0.60~4.70)

4.95(1.30~5.50)

Heating

3.75(0.65~4.80)

4.05(0.69~4.80)

4.60(1.20~5.40)

SEER / HSPF

(Btu/h)/W

16.00/9.00

Indoor Unit

Power Supply

V/Ph/Hz

Heat Exchanger

Cross Fin Coil

Fan

Drive

Direct

Motor Output

0.15×1

0.25×1

Air Flow

m3/h(CFM)

1900(1115)

2300(1350)

Sound Pressure Level(SS/H/M/L)

dB(A)

54/53/51/46

55/54/52/47

56/55/50/46

Air Filter

mm(inch)

Φ17×1.75

(φ0.67×0.07)

Φ17×1.75

(φ0.67×0.07)

Φ17×1.75

(φ0.67×0.07)

Outline Dimensions (W×H×D)

mm(inch)

1420×245×700

(55.9×9.6×27.6)

1420×245×700

(55.9×9.6×27.6)

1700×245×700

(66.9×9.6×27.6)

Net Weight

kg(lb)

48.0(105.8)

50.0(110.3)

59.0(130.1)

Outdoor Unit

Power Supply

V/Ph/Hz

Cross Fin Coil

Compressor

Type

Rotary

Power Input

4150

4580

Control

Electronic Expansion

Valve

Electronic Expansion

Valve

Electronic Expansion

Valve

Charge

kg(oz)

3.5(123.5)

3.7(130.5)

4.0(141.1)

Outline Dimensions (W×H×D)

mm(inch)

1107×1100×440

(43.6×43.3×17.3)

958×1349×412

(37.7×53.1×16.2)

958×1349×412

(37.7×53.1×16.2)

Net Weight

kg(lb)

93.0(205.1)

95.0(209.5)

105.0(231.5)

Piping

Connections

Liquid

Inch

Φ3/8

Gas

Inch

Φ5/8

Max. Length

m(ft)

30(98.4)

50(164.0)

Max. Height

m(ft)

15(49.2)

30(98.4)

Indoor

Outdoor

Cooling

Heating

Piping Length

18k~48k units

Service Manual

DHR36NCB21S DHR42NCB21S DHR48NCB21S

DHR36CSB21S DHR42CSB21S DHR48CSB21S

DHR36NCB21S DHR42NCB21S DHR48NCB21S

208/230V1Ph~ 60Hz 208/230V1Ph~ 60Hz 208/230V1Ph~ 60Hz

Condensate Piping

DHR36CSB21S DHR42CSB21S DHR48CSB21S

208/230V1Ph~ 60Hz 208/230V1Ph~ 60Hz 208/230V1Ph~ 60Hz

Heat Exchanger

Refrigerant

R410A

Nominal capacities are based on the following conditions.

Note:

The air volume is measured at the relevant standard external static pressure. Noise is tested in a semi-anechoic room, so it should be slightly higher in the actual operation due to

environmental change.

DB: 80.0℉ (26.7℃)

WB: 67.0℉ (19.4℃)

DB: 70.0℉ (21.1℃)

WB: 60.0℉ (15.6℃)

DB: 95.0℉ (35.0℃)

WB: 75.0℉ (23.9℃)

DB: 47.0℉ (8.33℃)

WB: 43.0℉ (6.11℃)

25.0ft (7.6m)

Page 19

Service Manual

Mode

Range of Outdoor Temperature

Cooling

Heating

Model

Compressor

Fan Motor

Fuse/Breaker

Capacity

Minimum

Circuit

Ampacity

Maximum

Overcurrent

Protection

Power Supply

Qty.

RLA

FLA

V/Ph/Hz

− A A A A

12.0

1.5

5/25

18.0

1.5

5/40

18.0

1.5

5/40

21.2

2.0

5/45

21.2

2*2.0

5/50

32.5

2*2.0

5/70

Model

Power Supply

Fan Motor FLA

Fuse/Breaker

Capacity

Minimum Circuit

Ampacity

Maximum

Overcurrent

Protection

V/Ph/Hz

A A A

0.6

5/15

1.3

5/15

1.3

5/15

2.1

5/15

2.1

5/15

4.0

5/15

0.5

5/15

0.5

5/15

0.9

5/15

1.5

0.9

5/15

1.5

0.9

5/15

1.5

5/15

0.6

5/15

0.6

5/15

1.4

5/15

1.4

5/15

1.4

5/15

2.1

5/15

3.2 Operation Range

3.3 Electrical Data

3.3.1 Outdoor unit

DHR18CSB2 208/230V1Ph ~ 60Hz 1 DHR24CSB21S 208/230V1Ph ~ 60Hz 1 DHR30CSB21S 208/230V1Ph ~ 60Hz 1

0℉ (-18.0℃)~118.4℉ (48.0℃)

0℉ (-18.0℃)~75.2℉ (24.0℃)

Table 1-3-1 Electrical Data of Outdoor Unit

DHR36CSB21S 208/230V1Ph ~ 60Hz 1 DHR42CSB21S 208/230V1Ph ~ 60Hz 1 DHR48CSB21S 208/230V1Ph ~ 60Hz 1

3.3.2 Indoor unit

DHR18NDB21S 208V/230V1Ph ~ 60Hz DHR24NDB21S 208V/230V1Ph ~ 60Hz DHR30NDB21S 208V/230V1Ph ~ 60Hz DHR36NDB21S 208V/230V1Ph ~ 60Hz DHR42NDB21S 208V/230V1Ph ~ 60Hz

DHR48NDB21S 208V/230V1Ph ~ 60Hz DHR18NKB21S 208V/230V1Ph ~ 60Hz DHR24NKB21S 208V/230V1Ph ~ 60Hz

Table 1-3-2 Electrical Data of Indoor Unit

DHR30NKB21S 208V/230V1Ph ~ 60Hz DHR36NKB21S 208V/230V1Ph ~ 60Hz DHR42NKB21S 208V/230V1Ph ~ 60Hz DHR48NKB21S 208V/230V1Ph ~ 60Hz DHR18NCB21S 208V/230V1Ph ~ 60Hz

DHR24NCB21S 208V/230V1Ph ~ 60Hz

DHR30NCB21S 208V/230V1Ph ~ 60Hz

DHR36NCB21S 208V/230V1Ph ~ 60Hz

DHR42NCB21S 208V/230V1Ph ~ 60Hz

DHR48NCB21S 208V/230V1Ph ~ 60Hz

Page 20

Service Manual

Indoor Unit

Outdoor Unit

TH-OE

TH-D

Condenser

Strainer

with Service Port

4-Way Valve

Muffler

TH-C

Low Pressure Switch

Accumulator

High Pressure Switch

Compressor

Suction Service Valve

with Service Port

TH-IE

Evaporator

TH-E

Cooling Heating

TH-OE: Outdoor Environment Thermal Bulb TH-C: Outdoor Condenser Thermal Bulb TH-D: Compressor Discharge Thermal Bulb

TH-IE: Indoor Environment Thermal Bulb TH-E: Indoor Evaporator Thermal Bulb

Strainer

Note:

RLA: Rated load amperes (marked in the nameplate of the outdoor unit) FLA: Full load amperes

① The fuse is located on the main board. ② Install the disconnect device with a contact gap of at least 3mm (1/8inch) in all poles near the

outdoor unit.The outdoor unit must be positioned so that the disconnect is reachable from the unit..

③ Interconnecting cable from outdoor unit to indoor unit should be a minimum 14AWG stranded

3-conductor with ground. Maximum cable length is 164 feet.

④ When connecting a wired zone controller to an indoor unit use 18AWG stranded cabling not

exceeding 98 feet.

4 PIPING DIAGRAM

Electronic Expansion Valve Liquid Service Valve

Note:

Not all items depicted in the diagram will necessarily apply to all units.

Page 21

5 CONTROLLERS

Comp. starts after

3min delay

Temp of indoor

≤Set temp

Comp. stop

for 3 min

Indoor fan run

Comp. and outdoor

fan run

Comp. and

outdoor fan stop

Power

OPERATION FLOWCHART

5.1 Cooling/Dry Operation

Set controller to cool or dry mode

Service Manual

Page 22

Service Manual

Comp. starts after

3min delay

Power

Comp. and

outdoor

fan run

Temp of indoor

≥Set temp

Comp. and

outdoor fan stop

Comp. stop

for 3 min

5.2 Heating Operation

Indoor unit running

in heat mode

Indoor fan starts only

with hot coil

Page 23

6 WIRELESS REMOTE CONTROLLER

No.

Name

Function Description

Signal

transmitter

 Signal transmitter

ON/OFF

button



MODE

button



 AUTO; COOL; DRY; FAN;

6.1 Operation and Display View

Service Manual

Table 2-2-1 Instructions for wireless remote controller

Press this button and the unit will be turned on; press it once more and the unit will be turned off. When turning off the unit, the Sleep function will be canceled, but the current time is still displayed. By pressing this button, Auto, Cool, Dry, Fan, Heat mode can be selected. Auto mode is default after power on. Under the Auto mode, the setpoint temperature will not be displayed; Under the Heat mode, the initial value is 28°C (82°F); under other modes, the initial value is 25°C (77°F).

HEAT (heat pump only)

Page 24

- button



+ button



FAN button



 Low speed  Middle speed  High speed

Note: Under the DRY mode, the fan will be kept running at the low speed and the fan speed isn't adjustable.

SWING

UP/DOWN

button



 When the guide louver starts to swing up and down, if SWING functions are canceled, the

air guide louver will stop and remains at the current position.



CLOCK

button

 By pressing this button, the clock is allowed to be set, with blinking, and then press

TIMER ON

button



Service Manual

Preset temperature can be decreased by pressing this button. Pressing and holding this button for more than 2 seconds will quickly adjust the temperature until released. The temperature adjustment is unavailable under the Auto mode. Celsius setting range: 16° C~30°C; Fahrenheit scale setting range 61°F~86°F.

Preset temperature can be increased by pressing this button. Pressing and holding this button for more than 2 seconds can make the temperature changed quickly until release the button and then transmit this order. The temperature adjustment is unavailable under the Auto mode, but the order can be sent by pressing this button. Celsius setting range: 16~30; Fahrenheit scale setting range 61~86. By pressing this button, Auto, Low, Middle, High speeds can be selected. After power on, Auto fan speed is default.

Press this button to set up the swing angle, which changes as below:

Indicates the guide louver swings up and down among those five directions (Simplified SWING function applicable for some Fan Coil Units: When the wireless remote controller is energized initially with the unit under the OFF status, it should be set by pressing the + button and the SWING button simultaneously, with the symbol blinking twice. Then, after the unit is turned on, this function can be activated by pressing the SWING button, with the displayed symbol indicating swing function is on. If the swing symbol is not showing, then the function is turned off..

the +/- button to adjust the clock. If the +/-button is held down for more than 2 seconds, the clock setting will be increased or decreased 10 minutes every 0.5 seconds. After that, another press on the CLOCK button accepts the setting. 12:00 is displayed, when the wireless remote controller is powered up for the first time. When TIMER O N is activated, ON will blink while the symbol will disappear. Within 5 seconds it is allowed to set the ON time by pressing the +/- button. Each press will make the time increase or decrease one minute. If the +/- button is held down, the time will

change quickly in single minute increments to begin with, then in 10 minute increments.

After the desired time value is set, press TIMER ON again to confirm the setting within five seconds. After that, another press on TIMER ON will cancel the setting. Prior to the timer

set up, the current time must be set for the timer to work correctly.

Page 25

Service Manual

X-FAN

button



TEMP button



 By pressing the TEMP button, when the temperature symbol is displayed, the indoor

is displayed, it will show the

indoor ambient temperature; when

TIMER

OFF button

 By pressing this button it is available to go to the TIMER OFF setting state with the same

setting method as that of the TIMER ON, in which case the OFF symbol blinks.

TURBO

button

 In the Cool or Heat mode, pressing this button can activate or deactivate the TURBO

function. When the TURBO function is activated, its symbol will be displayed; when the running mode or the fan speed is changed, this function will be canceled automatically (This function is applicable to partial of models).

SLEEP

button



LIGHT

button



Pressing this button can activate or deactivate the X-FAN function. In Cool or Dry mode, by pressing this button, if " " is displayed, it indicates the X-FAN function is activated. By repressing this button, if " " disappears, it indicates the X-FAN function is deactivated. When powering on the remote, the X-FAN function will be off. If the unit is turned off, X-FAN can be deactivated but can't be activated. By pressing this button you can choose to select the indoor setpoint temperature or the indoor ambient temperature.

The indoor setpoint temperature is displayed when the remote is first powered on.

unit display will show the indoor setpoint temperature; when

is displayed, this is indicating that the outdoor temperature, if received the other remote control signal, it will display presetting temperature is being read. (This is not applicable to all models.)

By pressing this button, Sleep On and Sleep Off can be selected. After powered on, default mode is Sleep Off. Once the unit is turned off, the Sleep function is canceled. When Sleep is set to On, the symbol of SLEEP will display. Under the Fan and Auto modes, this function is not available.

Press this button to select LIGHT on or off at the indoor display. When the LIGHT is set to on, the icon will be displayed at the hand-held remote. When the LIGHT is set to off, the icon

be turned off.

will no longer be shown at the hand-held remote and the display of the indoor unit will

7 WIRED ZONE CONTROLLER

7.1 Display View

Figure 2-3-1 Appearance of wired zone controller

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Service Manual

No.

Icons

Introduction

Left and right swing function

Up and down swing function

Air exchange function

Sleep function

Auto mode

COOL mode

DRY mode

FAN mode

HEAT mode

Health function

I-Demand function

Vacation function

Figure 2-3-2 LCD display of wired controller

Table 2-3-1 Instruction to LCD Display

Status display of main and secondary wired zone controller

Shield function

This button disables temperature adjustment, On/Off function, mode change

and the Energy Save function.

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Fan speed

Memory function

Turbo function

Energy-saving function

Ambient/setting temperature

Electric heater

Timer Setting

Quiet function

Lock function

The unit will resume the original setting state after power is restored

Blow function (Coil drying function)

Defrosting function (Heat Pump only)

Filter cleaning reminder

Service Manual

Keycard control / Motion Sensor Activation

7.2 Operation View

7.2.1 Wired Zone Controller Buttons

Figure 2-3-3 Wired zone controller buttons

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Service Manual

No.

Description

Functions

Enter/Cancel

①. Function selection and canceling; ②. Press it for 5s to view the ambient temperature; press Mode button

to select viewing outdoor ambient temperature or indoor ambient temperature.

▲

①. Running temperature setting range of indoor unit:

②. Timer setting range: 0.5~24hr; ③. Setting of air function level; ④. Setting of energy-saving temperature; ⑤. Setting of cleaning class.

▼

Fan

Setting of high/medium high/medium/medium low/low/auto fan speed.

Mode

Setting of auto/cooling/heating/fan/dry mode of indoor unit.

Function

Timer

Timer setting.

On/Off

Turn on/off indoor unit.

4 Mode

and

2 ▲

Memory function

2 ▲

and

6 ▼

Lock

4 Mode

and

5 Function

and

7 Timer

4 Mode

and

6 ▼

5 Function

and

6 ▼

Viewing historical

malfunction

1 Enter/Cancel

and

4 Mode

7.3.2 Button Functions

Table 2-3-2 Wired Zone Controller Button Functions

61°F~86℉ (16°C~30℃);

Switch over among these functions of swing/air/sleep/health/ I-Demand/turbo/save and cancel/e-heater/X-fan/clean/quiet.

Press Mode and ▲ buttons at the same time for 5s under off state of the

unit to enter/cancel memory function (If memory function is set, indoor unit will resume original setting state after power failure and then power recovery. If not, indoor unit is defaulted to be off after power recovery.

(Factory default for this function is "on").

Upon startup of the unit without malfunction or under off state of the unit,

press ▲ and ▼ buttons at the same time for 5s to enter lock state. All

wired zone controller buttons are locked out when lock is turned on.

Repress ▲ and ▼ buttons for 5s to quit lock state.

Programming

function (Unit/

controller

address)

Programming

Function

(General

Parameters)

Switch between

Fahrenheit and

Celsius

Setting of main and secondary wired zone controller

Pressing Mode and Function buttons at the same time with the unit turned

off puts the controller into Program Mode to allow confirmation/setting of

the unit/controller address. (See below for Programming information)

Under off state of the unit, press Function and Timer buttons at the same time for 5s to go to the programming menu. Press Mode button to scroll

through parameters and press ▲ or ▼ buttons to set the actual value.

Under off state of the unit, press Mode and ▼ buttons at the same time for

5s to switch between Fahrenheit and Celsius.

Continuously press Function and ▼ buttons for 5s to view historical

malfunction. Then press ▲ and ▼ buttons to scroll through listed error

codes if any. The timer displaying position displays the sequence of malfunction and the detailed error code. Up to five error codes may be

displayed.

Under off state of the unit, press Enter/Cancel and Mode buttons at the same

time for 5s to set main and secondary wired zone controller. Press ▲ or ▼

button to adjust. (Additional details available in the programming section.)

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Service Manual

Note:

The following functions can be set through Function and Timer buttons: setting of ambient temperature sensor, selecting three speeds in high speed and three speeds in low speed of indoor fan motor, display setting of freeze protection error code, setting of cold air prevention and hot air hot prevention function, setting of refrigerant-lacking protection function, selecting of blowing residual heat of indoor unit, selecting of compressor electric heater mode, selecting of low-power consumption mode, selecting door control function, selecting human sensitive function, longdistance monitoring, temperature compensation value at the air return port.

7.2.3 Setting of Wired Zone Controller/Indoor Unit Address

7.2.3.1 Setting and Confirmation of Address

Under off state of the unit, press Function and Mode buttons at the same time for 5s to enter setting

interface of wired controller‟s address. In this case, LCD displays address number. Then press▲ or ▼

button to adjust address and then press Enter/Cancel button to confirm. The address setting is related to the setting of Programming Function 4.9.10. When the selection in 4.9.10 is 00, this indicates the use of a

central controller and must have an address from 01 - 16. When the selection in 4.9.10 is 01, this

indicates the use of a BAS (building automation system) or BMS (building management system). In this

case, the unit/controller address would range from 01-255.

Confirming or setting of the indoor unit/controller address as shown in Figure 2-3-4 below:

Figure 2-3-

4 Setting and confirming of address

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Service Manual

7.2.3.2 Setting of Main/Secondary for Wired Zone Controllers

With the indoor unit turned off, press Enter/Cancel and Mode buttons at the same time for 5s to go to

the programming of main/secondary wired zone controller. Once in the program area, the LCD displays

the wired zone controller‟s address (01 for main wired zone controller and 02 for secondary wired zone

controller). Press ▲ or ▼ button to adjust address of main/secondary wired zone controller and then press

Enter/Cancel button to confirm. If wired zone controller is set as a secondary, the icon will be displayed.

Note: If there is only one wired zone controller, it can only be set as the main; if there are two

wired zone controllers, one should be the main and the other should be the secondary.

Setting

of main/secondary wired zone controller‟s address is shown as Figure 2-3-5 below:

Figure 2-3-5 Enquiry and setting of main/secondary wired zone controller‟s address

8 SPECIAL FUNCTIONS SETTINGS

8.1 Setting of Filter Clean Reminder Function

When unit is on, press Function button to switch to filter clean reminder function. The icon will blink and then enter setting of filter clean reminder function. Timer zone displays the set pollution level and you can press ▲ or ▼ button to adjust the level. Then press Enter/Cancel button to turn on this function.

When filter clean reminder function is turned on, press Function button to switch to filter clean reminder function. The icon will blink and press ▲ or ▼ button to adjust timer zone to display “00”. Then press Enter/Cancel button to cancel this function.

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Setting of filter clean reminder function is shown as Figure 2-4-1 below:

Service Manual

Figure 2-4-1 Setting of filter clean reminder function

When setting the filter clean reminder function, timer zone will display 2 digits, of which the former indicates the pollution degree of operating place and the latter indicates the accumulated operating time of indoor unit. There are 4 types of situations:

(1) Clean Reminder is off (Timer zone shows “00 .);

(2) Low particulate: the former digit in timer zone shows 1 while the latter one shows 0, which indicates the accumulated operating time is 5500hr. Each time the latter digit increases 1, the accumulated operating time increases 500hr. When it reaches 9, it means the accumulated operating time is 10000hr.

(3) Medium particulate: the former digit in timer zone shows 2 while the latter one shows 0,

which indicates the accumulated operating time is 1400hr. Each time the latter digit increases 1,

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Service Manual

level

Accumulated

operating time

(hour)

Pollution

level

Accumulated

operating time

(hour)

Pollution

level

Accumulated

operating time

(hour)

5500

1400

100

6000

1800

200

6500

2200

300

7000

2600

400

7500

3000

500

8000

3400

600

8500

3800

700

9000

4200

800

9500

4600

900

10000

5000

1000

accumulated operating time increases 400hr. When it reaches 9, it means the accumulated operating time is 5000hr;

(4) High particulate: the former digit in timer zone shows 3 while the latter one shows 0, which

indicates the accumulated operating time is 100hr. Each time the latter digit increases 1, the accumulated operating time increases 100hr. When it reaches 9, it means the accumulated operating time is 1000hr; The detailed pollution level and the corresponding time is as shown in Table 2-4-1 below:

Table 2-4-1 Pollution level and corresponding time

Pollution

If filter clean reminder function is turned on, the icon will be on.

(1) If cleaning time is not reached, no mater the setting is changed or not, the accumulated operating

time won‟t be recalculated when pressing Enter/Cancel button;

(2) If cleaning time is reached, in unit on or off state, will blink every 0.5s for reminder. Press

Function button to switch to icon and press ▲ and ▼ button to adjust the level. Then press

Enter/Cancel button, so the accumulated operating time won‟t be cleared (If the adjusted level is

higher than the present accumulated operating time, the icon won‟t blink any more; if the adjusted level is lower than the present accumulated operating time, the icon will go on blinking).

(3) The only way to cancel filter clean reminder function is to press Function button to switch to filter

clean reminder function. The icon will blink and press ▲ or ▼ button to adjust timer zone to

display “00”. In this case, the accumulated operating time will be cleared.

8.2 Low Temperature Drying Function

Under dry mode and when set temperature is 16℃(61℉), continuously press ▼ button until the

temperature is set to 12℃ (54℉). At this point, the unit will enter the low temperature drying function.

To exit low temperature drying function, press the temperature up button or mode button.

8.3 Lock Function

retained in the unit memory in the event of a power failure.

When unit is turned on normally or turned off, pressing ▲ and ▼ buttons at the same time for 5s will turn on Lock function. LCD will display . Pressing ▲ and ▼ buttons at the same time for 5s will turn off this function.

When Lock function is turned on, no other buttons will respond when pressed. This function will be

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Service Manual

8.4 Memory Function

Press Mode and ▲ buttons at the same time for 5s under off state of the unit to turn on or cancel

memory function. If memory function is set, is displayed. If not, indoor unit is defaulted to be off after power recovery.

If memory function is set, indoor unit will resume original setting state after power failure and then

power recovery.

Do not turn off power to the system immediately after activating/deactivating the memory function

Note:

as this may result in improper operation.

8.5 Door Control Function/Occupancy Function

When door control function is selected, the wired zone controller will work when the room card is inserted and stop working when the room card is removed; when occupancy function is selected, the wired controller will work when it senses there is somebody in the room and stop working when it senses there is nobody in the room. When the door control function senses the room card is not inserted or

occupancy function senses there is nobody in the room, the wired zone controller will display icon.

These two functions cannot be used at the same time.

Note:

① In long-distance monitoring or centralized control, no matter the room card is inserted or not,

the ON/OFF of unit can be controlled. If long-distance monitoring or centralized control information is received when the room card is not inserted, icon is cleared. When the card is reinserted, door control function is judged to be turned on. If long-distance monitoring or centralized control information is received when the room card is inserted, the indoor unit will maintain its original status.

② The unit can not be controlled by the wired zone controller when the card is not inserted. ③ When door control function and occupancy function have been set at the same time, only the

door control function will be operational.

8.6 Changing from Fahrenheit to Celsius

Under off state of the unit, press Mode and ▼ buttons at the same time for 5s to switch between

Fahrenheit and Celsius.

8.7 Ambient Temperature

Under off or on state of the unit, press it for 5s to view the ambient temperature. In this case, timer zone displays ambient temperature type 01 or 02. Ambient temperature zone displays the corresponding temperature of that type. 01 stands for outdoor ambient temperature and 02 stands for the indoor ambient temperature after compensation. Press Mode button to switch between 01 and 02. Pressing other buttons except Mode button or receiving remote control signal will exit enquiry state. If there is no operation within 20s will also exit enquiry state.

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Note:

① If the unit is not connected to outdoor ambient temperature sensor, display of outdoor

ambient temperature will be shielding after energizing for 12hr.

② If there is malfunction of outdoor ambient temperature sensor, display of outdoor ambient

temperature will be shielding after energizing for 12hr.

8.8 Error Code Recall

Under off or on state of the unit, continuously press Function and ▼ buttons for 5s to view recent

error codes.

When recalling error codes, you will see "00" in the set temperature area of the controller. Press ▲

and ▼ buttons to view the five most recent error codes, if any. The error code(s) will be displayed in the timer section of the controller. The fifth displayed code is the most recent.

8.9 Programming Function

Under off state of the unit, press Function and Timer buttons at the same time for 5s to go to the

programming menu. Press Mode button to adjust the setting items and press ▲ or ▼ button to set the actual value.

8.9.1 Setting ambient temperature sensor (dual ambient temperature sensors function)

In the programming area, press Mode button to adjust to “00” in temperature displaying area of

controller. Press ▲ or ▼ button to adjust. There are three selections:

(1) If the room temperature is to be read at the return air of the unit then the setting value would be "01". (2) If the room temperature is to be read at the wired zone controller, then the setting value would

be "02".

(3) To read the the room temperature at the indoor unit return in cooling, dry and fan mode, and/or

to read the room temperature at the wired zone controller in heating and auto modes, select "03".

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Service Manual

8.9.2 Freeze protection error code

In the programming area, press Mode button until “02” is displayed on the controller. Press ▲ or ▼

button to adjust. There are two selections:

(1) When activated controller displays "01"

(2) When deactivated controller displays "02"

This function may not apply to all models.

8.9.3 Low refrigerant lock out protection

In the programming area, press Mode button until "04" is displayed at the controller. Press ▲ or ▼

button to adjust. There are two selections:

(1) When protection is on, "01" will be displayed. (2) When protection is off, "02" will be displayed.

8.9.4 Selecting blowing residual heating of indoor unit

In the programming area, press Mode button until "05" is displayed at the controller. Press ▲ or ▼

button to scroll through selections:

(1) Mode 1 will be displayed as "00" on the controller (2) Mode 2 will be displayed as "01"

Mode 1: Outdoor unit stops when indoor unit reaches temperature setpoint. The indoor unit fan continues to run if in cooling mode; after outdoor unit stops when reaching temperature setpoint in heating mode, duct type unit and floor ceiling unit will blow residual heat for 60s and then stop indoor unit fan. Cassette units always operate in low fan speed and will blow residual heat for 60s.

Mode 2: After outdoor unit stops when reaching temperature setpoint. The indoor fan motor stops

operation with a 10s delay regardless if in heating or cooling mode.

8.9.5 Mode selecting of compressor crankcase heater

In programming area, press Mode button until "06" is displayed at the controller. Press ▲ or ▼

button to scroll through selections:

(1) Mode 1 (LCD displays 00) (2) Mode 2 (LCD displays 01)

Notes:

① Mode 1: Compressor crankcase heater starts when outdoor ambient temperature is below

35℃(95℉) and stops when outdoor ambient temperature is above 37℃ (99℉). When outdoor ambient temperature is within 35℃ (95℉)~ 37℃ (99℉), the heater will maintain its previous operation state. Mode 2: Compressor crankcase heater starts when outdoor ambient temperature is below -2°C

②

(28℉) and stops when outdoor ambient temperature is above 0℃ (32℉). When outdoor ambient temperature is within -2℃ (28℉)~0℃ (32℉), the heater will maintain its previous

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Service Manual

operation state.

8.9.6 Selecting low-power consumption mode

In the programming area, press Mode button until "07" is displayed at the controller. Press ▲ or ▼

button to scroll through selections:

(1) With low-power consumption mode (LCD displays 00) (2) Without low-power consumption mode (LCD displays 01)

8.9.7 Selecting door control function

In the programming area, press Mode button until "08" is displayed at the controller. Press ▲ or ▼

button to scroll through selections:

(1) Without door control function (LCD displays 00) (2) With door control function (LCD displays 01)

8.9.8 Selecting occupancy function

In the programming area, press Mode button until "09" is displayed at the controller. Press ▲ or ▼

button to scroll through selections:

(1) Without occupancy function (LCD displays 00) (2) With occupancy function (LCD displays 00)

8.9.9 Selecting building management system or central controller

In the programming area, press Mode button until "10" is displayed at the controller. Press ▲ or ▼

button to scroll through selections:

(1) Central controller (LCD displays 00) (2) Building management sys tem (LCD displays 01)

8.9.10 Selecting fan mode of indoor fan motor

In the programming area, press Mode button until "11" is displayed at the controller. Press ▲ or ▼

button to scroll through selections:

(1) P3 (LCD displays 03) (2) P4 (LCD displays 04) (3) P5 (LCD displays 05) (4) P6 (LCD displays 06) (5) P7 (LCD displays 07)

Note:

different fan mode combinations are corresponding to different static pressure. Ex-factory defaulted mode is P05. You can set the mode through wired controller. S01 (lowest), S02, S03……S12, S13 (highest).

You can select P03, P04, P05, P06, P07 in fan mode of indoor fan motor, which means

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Service Manual

Static pressure selection

Super

high

speed

High

speed

Medium

high speed

speed

Medium

low speed

Low

speed

Quiet

speed

Quiet

speed

Quiet

speed

P03

S09

S08

S07

S06

S05

S04

S03

S02

S01

P04

S10

S09

S08

S07

S06

S05

S04

S03

S02

P05

S11

S10

S09

S08

S07

S06

S05

S04

S03

P06

S12

S11

S10

S09

S08

S07

S06

S05

S04

P07

S13

S12

S11

S10

S09

S08

S07

S06

S05

Table 2-4-2 Combination relationship of P03, P04, P05, P06, P07

Medium

8.9.11 Selecting compensation of temperature sensor at air return

In the programming area, press Mode button until "12" is displayed at the controller. Press ▲ or ▼

button to scroll through selections:

(1) Compensate 0℃ (32℉) (LCD displays 00) (2) Compensate 1℃ (34℉) (LCD displays 01) (3) Compensate 2℃ (36℉) (LCD displays 02) (4) Compensate 3℃ (37℉) (LCD displays 03) (5) Compensate 4℃ (39℉) (LCD displays 04) (6) Compensate 5℃ (41℉) (LCD displays 05) (7) Compensate 6℃ (43℉) (LCD displays 06) (8) Compensate 7℃ (45℉) (LCD displays 07)

(9) Compensate 8℃ (46℉) (LCD displays 08) (10) Compensate 9℃ (48℉) (LCD displays 09) (11) Compensate 10℃ (50℉) (LCD displays 10) (12) Compensate 11℃ (52℉) (LCD displays 11) (13) Compensate 12℃ (54℉) (LCD displays 12) (14) Compensate 13℃ (55℉) (LCD displays 13) (15) Compensate 14℃ (57℉) (LCD displays 14) (16) Compensate 15℃ (59℉) (LCD displays 15)

Note:

Indoor ambient temperature compensation can be set through wired zone controller (e.g. If

02 is selected, it indicates the compensation temperature is 36℉ (2℃). If the indoor ambient

temperature detected by the temperature sensor at air return is 84℉ (29℃), the ambient temperature after compensation is 29℃ (84℉)-2℃ (36℉)=27℃ (81℉)).

After finishing setting, press

Enter/Cancel button to save and exit setting. If there is no input for

20s while in this programming area, it will automatically exit to normal controller function. Any changes made will not be saved.

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Service Manual

Temperature excursion protection

Low voltage protection of bus bar

High voltage protection of bus bar

Charging circuit malfunction

Abnormity of input voltage

Malfunction of outdoor drive memory chip

When there is a malfunction during operation, error will be displayed at the controller. When several

malfunctions occur at the same time, these error codes will be displayed as a sequence that can be

scrolled through.

When there is a malfunction, please turn off the unit and call the installing contractor or local service professional. See below for an example of a displayed error (E1-high pressure protection).

Figure 2-6-1

9 CENTRAL CONTROLLER

9.1 Smart Zone Controller

9.1.1 Function

The smart zone controller can directly control up to 16 sets of indoor units in a control network and is available to check the running status of any unit through the LCD, including running mode, timer, fan speed, centralized control, etc.

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Service Manual

No.

Name

Function Description

Mode

It is used for the switchover among different modes.

Fan

It is used to set the fan speed, high, medium, low or auto.

On/Off

It is used to set the on/off status of the indoor unit.

▲

①. Under the single/centralized control status: It is used to set the running

②

③

▼

Mon

1/9

Tue 2/10

Wed

3/11

9.1.2 Buttons and Display of Central Controller

Figure 2-7-1

9.1.3 Function Buttons

Table 2-7-1 Functions of Buttons

temperature of the indoor unit with max. 86℉ (30°C ) and min. 61℉ (16°C );

. Under the timer setting status: It is used to set the timer period with max. 24

hours;

. Under the clock setting status: It is used to set the hour and minute.

It is used for the switchover between unit 1 and unit 9; Under the timer or clock setting status, it indicates Monday. It is used for the switchover between unit 2 and unit 10; Under the timer or clock setting status, it indicates Tuesday. It is used for the switchover between unit 3 and unit 11; Under the timer or clock setting status, it indicates Wednesday.

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Thu 4/12

It is used for the switchover between unit 4and unit 12;

Fri

5/13

Sat

6/14

Sun 7/15

8/16

It is used for the switchover between unit 8 and unit 16.

Timer/Time

Central

It is used for the switchover between single and centralized control modes.

Shield

All on/off

It is used to start/stop all indoor units.

Under the timer or clock setting status, it indicates Thursday. It is used for the switchover between unit 5and unit 13; Under the timer or clock setting status, it indicates Friday. It is used for the switchover between unit 6 and unit 14; Under the timer or clock setting status, it indicates Saturday. It is used for the switchover between unit 7 and unit 15; Under the timer or clock setting status, it indicates Sunday.

It is used to set the timer or on/off time of the selected indoor unit as well as to set the clock of the system.

It is used to deactivate some or all functions of a single or a group of indoor unit(s).

9.1.4 LCD of the Controller

Service Manual

9.1.4.1 Outline Drawing of the LCD

Figure 2-7-2

9.1.4.2 Introduction to Symbols on the LCD

Figure 2-7-3

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Service Manual

No.

Name

Description

Fan speed

It displays the fan speed of the indoor unit, high, medium, low and auto.

Running mode

It displays the running mode of the indoor unit, auto, cool, dry, fan and heat.

System clock

It displays the current time (hour and minute) in 24-hour time system and also the week day.

Weekly timer

Set temperature Indoor unit code

It displays the set temperature, indoor unit code (01-16), and symbols of Celsius and Fahrenheit scale.

Control mode

It displays “CENTER” under the centralized control mode and no

display under the single control mode.

Ambient

temperature

Serial port

It displays the ambient temperature, serial port as well as symbols of Celsius and Fahrenheit scale.

Indoor unit code

On/off status

Numbers indicate the indoor unit codes which will be displayed when

the corresponding indoor unit is online; “” indicates the on/off status of

the indoor unit, its flashing for “on” or else for “off”

Error

Child lock

It displays the error codes when some error(s) arises and also “CHILD LOCK” when this function is activated.

Table 2-7-2 Introduction to the Symbols on the LCD

Shield/Lock It displays the shield/lock status, “ALL‟, “TEMP”, “MODE” and „On/Off”.

It displays the timer period (unit: 0.5 hour) which will repeat every week.

9.1.4.3 Network Topology

Network Connection of the Smart Zone Controller

Figure 2-7-4

Page 42

9.1.4.4 Dimensions

9.2 Additional Special Functions

9.2.1 Door control function

Door control function is available for this series. In order to carry out this function, please consult

Service Manual

Figure 2-7-5

the Call Center for information on door control accessories. (Call Center Support information is on last

page of this manual.)

(1) Interface instructions

1) The interface printing is DOOR-C and the type is B2B-XH-B. The wires of door control accessories must be connected to this interface;

2) Electrical characteristic: none;

Working principle: When a room card or similar object is inserted, the interface allows the

indoor unit to be operated normally. When the card is removed, the indoor unit returns to the

off state and cannot be turned on.

Connect the door control detection port of indoor main board with the interface of door control board (CN1 in the following Figure); connect the door control signal to the door control signal input port (X1 and X2 in the following Figure). X1 is AC 220V signal input and X2 is DC +5V to 24V. You can only choose X1 or X2. Definition of interface is as shown in Figure below:

Figure 2-7-6 Illustration of door control port

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Service Manual

No.

Terminal name

Terminal instruction

CN1

CN1 wiring terminal and door control interface of indoor main board

X1(AC-L, AC-N)

X1(AC-L, AC-N) wiring terminal, connected to door control input

signal, rated voltage 220V.

Table 2-7-3 Door control wiring port

X2 wiring terminal, connected to door control input signal (low voltage)

(2) Function instructions:

In order to achieve this function, set it through wired controller and refer to the following operation method. Factory default is that this function is not activated; if this function is set and door control accessories are connected, the unit will control the ON/OFF of unit according to the card state detected by door control detection board. When the card is not inserted, the unit will go to standby state. If the unit has a wired zone controller, icon will be displayed on the wired zone controller.

If the unit has no wired zone controller, there will be no display. The unit will control the ON/OFF of

unit according to the detected information.

(3) Setting method:

Under off state of the unit, press Function and Timer buttons at the same time for 5s to go to the

programming menu. Press Mode button until "08" is displayed at the controller. Press ▲ or ▼ button to

scroll through selections:

1) Without door control function (LCD displays 00)

2) With door control function (LCD displays 01)

Choose the second selection and then press Enter/Cancel button to save and exit setting. Now, door control function is activated. The unit will memorize this setting status. The setting value will be maintained in the event of a power failure. The detailed setting is as shown in the Figure below:

Figure 2-7-7

Page 44

Service Manual

9.2.2 Occupancy function

You must purchase the occupancy module for this function to be activated. An interface for this module is reserved on the mainboard of indoor unit.

(1) Interface instruction:

1) The printing is CN23 and the interface type is JST B3B-PH-K-S;

2) Electrical characteristic: 1-pin: +12V; 2-pin: detection port; 3-pin: GND; current: 150mA;

3) Working principle: When the module detects there is nobody in the room, 2-pin and 3-pin are short-circuited and they are low electrical level; when there is somebody in the room, 2-pin output is high electrical level.

(2) Function instructions:

In order to achieve this function, set it through wired controller and refer to the following operation method. It is defaulted that this function is not activated; if this function is set and occupancy module is connected, the unit will control the ON/OFF of unit according to the signal detected by occupancy module. When there is nobody in the room and the unit has a wired zone controller, icon will be displayed on the wired zone controller; if the unit has no wired zone controller, there will be no display. The unit will control the ON/OFF of unit according to detected information.

(3) Setting method:

With the indoor unit turned off, press Function and Timer buttons simultaneously for 5s to go to the

programming menu. Press Mode button until "09" is displayed at the controller. Press ▲ or ▼ button to

adjust. There are 2 selections:

1) Without occupancy function (LCD displays 00)

2) With occupancy function (LCD displays 01)

Choose the second selection and then press Enter/Cancel button to save and exit setting. Now, occupancy function is activated. The unit will maintain this setting status. The setting value will be maintained after a power failure. The detailed setting is as shown in the Figure on the next

page.

Page 45

Service Manual

Note:

When the door control function and occupancy function have been set at the same time, it is

defaulted that door control function is valid and occupancy function is invalid.

The user can purchase the occupancy module as an accessory. Please pay attention to the

following notes:

① There is a dedicated connection on the mainboard. The interface module inserted into this

connection must be PH-3P-K.

② The current consumption of module can not exceed the current capacity provided by this

interface.

Figure 2-7-8 ("human sensitive" = "occupancy"

9.2.3 Connect to interface of central controller:

The indoor unit is interfaced with the central controller. When a central controller is connected, centralized control of a unit can be realized if the wired zone controller is not connected; (1) Interface instruction:

1) The connection is COM-BMS2, COM-BMS3 and the interface type is B2B-XH-K3;

2) Working principle: Centralized control and communication of indoor mainboard and unit control;

(2) Function instructions:

In order to achieve this function, set the address mode and address through the wired zone controller. Please refer to Point 3 (below) for the setting method. The address mode is defaulted to be connecting to a central controller mode and the defaulted address is 1. When the central controller is connected, centralized control of the unit can be realized to control unit ON/OFF, operation mode, set fan speed/temperature and weekly timer.

Page 46

Service Manual

(3) Setting method: First, set the address mode of the wired zone controller into central controller address mode. The setting method is:

1) Under off state of the unit, press Function and Timer buttons at the same time for 5s to go to the programming menu. Press Mode button until "10" is displayed at the controller. Press ▲ or ▼ button to scroll through selections:

①

Centralized controller address mode (LCD displays 00)

② Building management control address mode (LCD displays 01)

Choose the first selection and then press Enter/Cancel button to save and exit setting. Now, the address of wired zone controller is set to match the address of centralized controller. The unit will memorize this setting status. The setting value will be maintained after a power failure. The detailed setting is as shown in the Figure below:

Figure 2-7-12

2) Address setting of each unit: When the address mode is set to be central controller address mode. The address setting value range is 01~16. The setting method is:

Under off state of the unit, press Function and Mode buttons at the same time for 5s to enter setting interface of wired zone controller address. LCD displays address sequence. Press ▲ or ▼ button to adjust the address sequence and then press Enter/Cancel button to confirm. The setting value will be maintained after a power failure. The detailed setting is as shown in the Figure below:

Page 47

Service Manual

Figure 2-7-13

Page 48

Service Manual (2) Function instructions:

In order to achieve this function, set the address mode and address through wired zone controller. Please refer to Point 3 below for the setting method. The address mode is defaulted to be connecting to central controller mode and the defaulted address is 1;

When the central controller is connected, central control of the unit can be realized to control unit ON/OFF, operation mode, set fan speed/temperature and weekly timer.

(3) Setting method:

First, set the address mode of wired zone controller into central controller address mode. The setting method is:

1) Under off state of the unit, press Function and Timer buttons at the same time for 5s to go to

the programming menu. Press Mode button until "10" is displayed at the controller. Press ▲ or

▼ button scroll through selections:

① Central controller address mode (LCD displays 00) ② Building management control address mode (LCD displays 01)

Choose the first selection and then press Enter/Cancel button to save and exit setting. Now, the address of wired controller is set to match the address of centralized controller. The unit will memorize this setting status. The setting value will be maintained after a power failure. The detailed setting is as shown in the Figure below:

Figure 2-7-12

2) Address setting of each unit: When the address mode is set to be central controller address mode. The address setting value range is 01~16. The setting method is:

Page 49

Service Manual

Under off state of the unit, press Function and Mode buttons simultaneously for 5s to enter setting

interface of wired zone controller address. LCD displays address sequence. Press ▲ or ▼ button to

adjust the address sequence and then press Enter/Cancel button to confirm. The setting value will be

maintained after a power failure. The detailed setting is as shown in the Figure below:

Figure 2-7-13

When the address is set, the wired zone controller can be removed and connect the central controller

to the indoor mainboard. Then connect the required units to realize central control of these units.

Notes:

① When central controller is to be connected, set the address mode into central controller

address mode through wired zone controller. Building management system control address mode can not be set;

② The unit addresses in the same network must be different, otherwise, communication

malfunction will occur and the unit will not work correctly.

③ When central controller is to be connected, the unit address range is 1-16. Only 16 indoor

units can be connected to each central controller.

④ The code and model of central controller is as below:

Name Remark

Central Controller

DCCRMW

Only 16 indoor units can be connected to this

controller

Page 50

No.

Error code

Malfunction

name

Origin of

malfunction signal

High pressure

pressure

When outdoor unit detects the high pressure switch is cut off for 3s successively, high pressure protection will occur. All the loads (except the 4

way valve in heating mode) will be switched off. In

this case, all the buttons and remote

control signals except ON/OFF button will be disabled and cannot be recovered automatically. Switch off the unit or re

energize the unit after

cutting off power to eliminate this protection.

Freeze protection

Indoor evaporator

temperature

If detecting that the evaporator temperature is lower than protective temp. value after the unit has been running for a period of time under cooling or dry mode, the unit will report this fault, in which case the compressor and outdoor fan motor will be stopped. The unit will not run until evaporator temperature is higher than the protective temp. value and the compressor is stopped for 3min.

Low pressure

If it is detected within 30s successively that the low-pressure switch is cut off under ON or standby state, the unit will report low pressure protection. If the fault occurs successively 3 times within 30min, the unit cannot be recovered automatically.

Refrigerant

lacking protection

If the unit reports system refrigerant lacking within 10min after turning on the unit, the unit will stop operation. If the fault occurs successively 3 times, the unit cannot be recovered automatically.

Refrigerant

recycling mode

If enter refrigerant recycling mode through special operation, E3 will be displayed. After exiting refrigerant recycling mode, the code will disappear.

Compressor high

ischarge

temperature

Compressor

discharge

temperature is

If outdoor unit detects that the discharge temperature is higher than protective temp. value, the unit will report high discharge temperature protection. If the protection occurs over 6 times, the unit cannot be recovered automatically. Switch off the unit or re-energize the unit after cutting off power to eliminate this protection.

Communication

malfunction

Communication

between indoor

and outdoor main

If the outdoor unit does not receive data from indoor unit, communication malfunction will be reported. If there is communication abnormity between display board and indoor unit, communication malfunction will be reported too.

Malfunction of

indoor fan motor

Indoor fan motor

If the indoor unit does not receive signal from indoor fan motor for 30s successively when the fan motor is operating, indoor fan motor malfunction will be reported. In this case, the unit can automatically resume operation after stopping. If the malfunction occurs 6 times within one hour, the unit cannot be recovered automatically. Switch off the unit or re

energize the unit after

cutting off power to eliminate this malfunction.

Service Manual

MAINTENANCE AND TROUBLESHOOTING

ERROR CODES TABLE

10.1 Main Control Malfunction

Table 4-1-1 Fault Display on Indoor Wired Zone Controller

protection

switch

sensor

Control description

protection

switch

high

board

Page 51

No.

Error code

Malfunction

name

Origin of

malfunction signal

Full water

protection

Water level switch

If cut-off of water level switch is detected for 8s successively once energized, the system will enter full water protection. In this case, switch off the unit and then switch it on to eliminate this malfunction.

Malfunction of

indoor ambient

temperature

sensor at air

return port

Indoor ambient

temperature

If the indoor ambient temperature sensor is detected of open circuit or short circuit for 5s successively, indoor ambient temperature sensor malfunction will be reported. The unit can automatically resume operation after the malfunction disappears. If indoor ambient temperature sensor malfunction occurs in fan mode, only the error code is displayed and the indoor unit can work normally.

Malfunction of

evaporator

temperature

Evaporator

temperature

If the indoor evaporator temperature sensor is detected of open circuit or short circuit for 5s successively, evaporator temperature sensor malfunction will be reported. The unit can automatically resume operation after the malfunction disappears. If evaporator temperature sensor malfunction occurs in fan mode, only the error code is displayed and the indoor unit can work normally.

Malfunction of

condenser

temperature

Condenser

temperature

If the outdoor condenser temperature sensor is detected of open circuit or short circuit for 5s successively, condenser temperature sensor malfunction will be reported. The unit

can automatically resume operation after the malfunction disappears. If condenser temperature sensor malfunction occurs in fan mode, only the error code is displayed and the indoor unit can work normally.

Malfunction of

outdoor ambient

temperature

Outdoor ambient

temperature

If the outdoor ambient temperature sensor is detected of open circuit or short circuit for 5s successively, outdoor ambient temperature sensor malfunction will be reported. The unit can automatically resume operation after the malfunction disappears. If outdoor ambient temperature sensor malfunction occurs in fan mode, only the error code is displayed and the indoor unit can work normally.

Malfunction of

discharge

temperature

Discharge

temperature

If the outdoor discharge temperature sensor is detected of open circuit or short circuit for 5s successively after the compressor has been operating for 3min, outdoor discharge temperature sensor malfunction will be reported. The unit can automatica lly resume operation after the malfunction disappears.

Malfunction wired

controller

temperature

sensor

Wired controller

If the wired controller detects open circuit or short circuit of its temperature sensor for 5s successively, wired controller temperature sensor malfunction will be reported.

Malfunction of

outdoor drive

memory chip

Outdoor drive

If the memory chip of outdoor drive board is broken, the unit cannot be started. The unit cannot be recovered automatically. If the malfunction cannot be eliminated after switching off the unit and then energizing the unit for several times, please replace the outdoor drive board.

Compressor

overload

protection

Compressor

overload switch

If it is detected within 3s successively that the overload switch is cut off under ON or standby state, the unit will report overload protection. If the fault occurs successively 3 times, the unit cannot be recovered automatically. Switch off the unit or re

energize the

unit after cutting off power to eliminate this protection.

sensor

Service Manual

Control description

sensor

board

Page 52

No.

Error code

Malfunction

name

Origin of

malfunction signal

Overload

protection

Evaporator

perature,

condenser

temperature

If outdoor unit detects that the tube temperature is higher than protective temp. value, the unit will report overload protection. The unit will not restart operation until tube temperature is lower than the protective temp. value and the compressor is stopped for 3min. If the protection occurs over 6 times, the unit cannot be recovered automatically. Switch off the unit or re

energize the unit

after cutting off power to eliminate this protection.

Malfunction of

outdoor fan motor

Outdoor fan motor

If the outdoor unit does not receive signal from outdoor fan motor for 30s successively when the fan motor is operating, outdoor fan motor malfunction will be

reported. In this case, the unit can automatically resume operation after stopping. If the malfunction occurs 6 times within one hour, the unit cannot be recovered automatically. Switch off the unit or re

energize the unit after

cutting off power to eliminate this malfunction.

Direction

changing

malfunction of

way valve

After the compressor starts operation in heating mode, if the outdoor unit detects the difference between evaporator temperature and indoor ambient temperature is lower than the protective value for 10min successively, direction changing malfunction of 4

way valve will be reported and the outdoor unit will stop operation. The unit can automatically resume operation in the first two malfunctions. If the malfunction occurs 3 times, the unit cannot be recovered automatically. Switch off the unit or re-energize the unit after cutting off power to eliminate this malfunction.

Communication

malfunction

between main

control and drive

Communication

between main

control board and

drive board

If the outdoor main control board does not receive data from drive board, communication malfunction between main control and drive will be reported. This malfunction can be eliminated automatically.

Malfunction of

outdoor main

control memory

Outdoor main

control board

If the memory chip of outdoor main control board is broken, the unit cannot be started. The unit cannot be recovered automatically. If the malfunction cannot be eliminated after switching off the unit and then

energizing the unit for several

times, please replace the outdoor main control board.

Service Manual

Control description

tem

chip

Page 53

10.2 Description of Drive Malfunction

Indoor Unit Display

Outdoor unit display of dual 8 numeral

tube

IPM or PFC over-temperature protection

IPM or PFC temperature sensor error

ection

Drive

control communication error

)

Main board dual 8 numeral tube Display Codes for Outdoor Unit of 18k~48k

Malfunction Item

Service Manual

DC busbar over-voltage protection

Current sense circuit error Pc Pc

Compressor current protection P5 P5

DC busbar under-voltage prot

Compressor startup failure Lc Lc

Drive module reset P0 P0

Compressor motor desynchronizing

Phase loss Ld Ld

-to-main-

IPM protection H5 H5

Compressor overload protection H3 H3

AC current protection (input side)

Charging circuit error PU PU

PFC protection HC (48k only

DC fan error H6 H6

PH PH

P8 P8

P7 P7

PL PL

H7 H7

P6 P6

PA PA

HC (48k only)

Input AC voltage abnormality PP PP

Driving board memory chip error ee ee

Page 54

Service Manual

11 FLOW CHART FOR TROUBLESHOOTING

11.1 Troubleshooting Flow Chart of Main Control Malfunction

 E1 High Pressure Protection

Page 55

Service Manual

 E2 Freeze Protection

Freeze protection is normal protection b

ut not abnormal malfunction. If freeze protection

occurs frequently during operation, please check if the indoor filter is dirty or if the indoor air outlet is

abnormal. The user is required to clean the filter, check the air outlet and air return pipe periodically to

ensure smooth air return and air outlet.

 E3 stands for three statuses:

(1) Low pressure protection

(2) Refrigerant lacking protection

(3) Refrigerant recycling mode

1) If enter refrigerant recycling mode through special operation, the displayed E3 is not an error

code. It will be eliminated when exiting refrigerant recycling mode.

If you do not want to have refrigerant lacking protection, you can

enter the debugging mode

through wired zone controller and then cancel the refrigerant lacking protection mode.

Page 56

Service Manual

 E4 Discharge Protection

 E6 Communication Malfunction

Communication

communication wire between

indoor unit and outdoor unit is

connected well

Check if there is

open circuit in the communication

wire between indoor unit and

outdoor unit is energized

malfunction

Check if the

Yes

outdoor unit

Check if the

Yes

Reconnect the

communication

wire

Replace the

communication

wire

Energize the

outdoor unit

Yes

Replace the mainboard

Page 57

 E9 Full Water Protection

Service Manual

E9 protection

 F0 Malfunction of

If the unit is

installed with

water pump

Yes

Check if the water pump

works normally

Yes

Replace the full water switch

or make sure the float of full

water switch works normally

mainboard according to the circuit

Indoor Ambient Temperature Sensor

Malfunction of

indoor ambient

temperature

sensor

Short circuit the full water

protection interface on indoor

diagram

Replace the water pump

Check if the

indoor ambient temperature

sensor on mainboard is inserted

on the needle

stand correctly

Yes

Disconnect

the temperature sensor and

measure if its resistance is

normal

Yes

Replace the indoor

mainboard

Correctly insert the

temperature sensor

on the needle stand

Replace the

temperature sensor

Page 58

Service Manual

 F1 Malfunction of Evaporator Temperature Sensor

Malfunction of

evaporator

temperature

sensor

Check if the evaporator

temperature sensor on

mainboard is inserted on the

needle stand correctly

Yes

Disconnect

the temperature sensor and

measure if its resistance is

normal

Yes

Replace the

indoor

mainboard

 F2 Malfunction of Condenser Temperature Sensor

Malfunction of

condenser

temperature

sensor

Correctly insert the

temperature

sensor on the

needle stand

Replace the temperature

sensor

Check if the condenser

temperature sensor on

mainboard is inserted on the

needle stand correctly

Yes

Disconnect

the temperature sensor and

measure if its resistance is

normal

Yes

Replace the

outdoor

mainboard

Correctly insert the

temperature sensor

on the needle stand

Replace the

temperature sensor

Page 59

 F3 Malfunction of Outdoor Ambient Temperature Sensor

Malfunction of

outdoor ambient

temperature

sensor

Check

if the outdoor ambient

temperature sensor on mainboard

is inserted on the needle stand

correctly

Yes

Service Manual

Correctly insert the

temperature sensor on

the needle stand

Disconnect

the temperature sensor and

measure if its resistance is

F4 Malfunction of Discharge Temperature Sensor



normal

Yes

Replace the

outdoor

mainboard

Malfunction of

discharge

temperature

sensor

Check if the

discharge temperature sensor on

mainboard is inserted on the

needle stand correctly

Replace the

temperature sensor

Correctly insert the temperature sensor on the needle stand

Yes

Disconnect

the temperature sensor and

measure if its resistance is

normal

Yes

Replace the

outdoor

mainboard

Replace the

temperature sensor

Page 60

Service Manual

 F5 Malfunction of Wired Controller Temperature Sensor

 H6 Malfunction of Outdoor Fan Motor

Malfunction of

wired controller

temperature

sensor

Replace the

wired controller

Page 61

 E8 Malfunction of Indoor Fan Motor

Malfunction of

indoor fan motor

Service Manual

Check if the

control wire of indoor fan motor is

connected on the outdoor

mainboard correctly

Yes

Replace

the indoor fan motor and then

restart the unit to see if there still

is malfunction of indoor

fan motor

Yes

Replace the

indoor

mainboard

Correctly connect the

control wire of fan motor

on the mainboard

Operate the unit with

the new motor

11.2 Troubleshooting Flow Chart of Drive Malfunction

Note: For Outdoor Unit Drive

P0 Drive module reset

(Inverter) by Single-phase Motor 

 P7 IPM or PFC temperature sensor error

 PA AC current protection (input side)

 PC Current sensor circuit error

 HC PFC protection (48k only)

P0ǃP7 ˆPA ˆHC or

PC is displayed on

wired zone controller

P0 ˆP7 ˆPA ˆHc or

PC is displayedin the

mainboard 88

Indicating Light

Replace the

mainboard

Works Normally

Page 62

Service Manual

 P8 IPM or PFC over-temperature protection

P8 is displayed on

wired zone

controller

P8 is displayed in the

mainboard 88

Indicating light

Yes

Replace the

mainboard

 PH DC busbar over-volt

age protection

 PL DC busbar under-voltage protection

Is the

IPM or PFC module

of mainboard

tightened˛

Works normally

Tighten the IPM

or PFC module

Page 63

 P6 Drive-to-main-control communication error

 Lc Compressor Startup Failure

Service Manual

Lc is displayed on

the wired controller

Lc is displayed in

the mainboard 88

indicating light

Yes

 P5 Compressor curr

ent protection

 H7 Compressor motor desynchronizing

 H5 IPM protection

 Ld Phase loss

P5, H7, H5 or Ld is displayed

on wired zone controller

P5, H7, H5 or Ld is displayed

in the mainboard 88

indicating light

Replace the

mainboard. Does it

work normally?

Replace the compressor

Works normally

Is the compressor

phase sequence right?

Yes

Is the compressor wire

terminals tightened˛

Replace the mainboard.

Does it work normally˛

Replace the compressor Work normally

Yes

adjust the

compressor

phase sequence

Tighten the

compressor wire

terminals

Yes

Page 64

Service Manual

 PU Charging circuit error

Yes

PU is displayed on

wired zone

controller

PU is displayed in

the mainboard 88

indicating light

Is the PFC wire

tightened or is the

sequence right?

Replace the

mainboard

 ee driving board chip error

ee is displayed

on the wired

controller

Replace the

mainboard

Yes

Is the

jumper

loose˛

Works normally

Yes

Tighten the

Tighten the PFC

wire or adjust the

sequence

jumper

Works Normally

Page 65

 H6 DC fan error

Service Manual

Page 66

NO.

SILK-SCREEN

Power supply interface to the drive

DC_MOTOR2

DC_MOTOR1

Power supply interface to the drive

Service Manual

11.3 Interface

 DHR18CSB21S / DHR24CSB21S / DHR30CSB21S / DHR36CSB21S / DHR42CSB21S /

DHR48CSB21S Main Control Board

INTERFACE

AC-L Live wire input Live wire input

AC-N Neutral wire input Neutral wire input

PWR 1

Control power output[1- DC bus voltage, 3- GND]

DC fan motor2 1-pin: Power supply of fan motor 3-pin: Fan GND 4-pin: +15V 5-pin: Signal control 6-pin: NC

DC fan motor1 1-pin: Power supply of fan motor 3-pin: Fan GND 4-pin: +15V 5-pin: Signal control 6-pin: Signal Feedback

INTERFACE INSTRUCTIONS

1-pin: DC bus voltage 3-pin: DC bus GND

Interface of DC fan motor 1-pin: DC bus voltage 2-pin: Suspended 3-pin: DC bus GND 4-pin: +15V 5-pin: Control signal input 6-pin: Not connected

Interface of DC fan motor 1-pin: DC bus voltage 2-pin: Suspended 3-pin: DC bus GND 4-pin: +15V 5-pin: Control signal input 6-pin: DC fan motor feedback

CN3

Control power output[1-GND 2-18Vˆ3-15V]

1-pin: GND

2-pin: +18V

3-pin: +15V

Page 67

COMM1

Communication needle stand of

Communication needle stand with

pin plus

Communication interface

10 H-PRESS

High pressure switch for fan speed

Pressure protection switch for fan

Interface of high pressure

Interface of low pressure

COMP

Interface of compressor overload

T-SENSOR2

1&2 pin: Case temperature sensor 3&4 pin: Ambient temperature

5&6 pin: Discharge temperature

nterface of electronic expansion

Communication line [1-3.3Vǃ23-RXǃ4-GND]

main control drive

1-pin: +3.3V

2-pin: TXD

3-pin: RXD

4-pin: GND

Service Manual

OVC-

CN2

CN1

HPP

LPP

Communication line with1-pin GND, 2-pin B and 3-pinA˅

Communication line with 112V, 2-pin B, 3-pin A and 4-pin GND

adjustment

High pressure switch for system protection (obligate˅

Low pressure switch for system protection (obligate˅

Compressor overload protection

1&2 pin: Tube sensor 3&4 pin: Ambient temperature 5&6 pin: Air discharge

indoor unit

1-pin: GND

2-pin: B

3-pin: A

(reserved):

1-pin: +12V

2-pin: B

3-pin: A

4-pin: GND

speed adjustment

protection

sensor

Electronic expansion valve line

HEAT Compressor electrical heater Compressor electric heating belt

VA-1 Chassis electrical heater Chassis electric heating belt

4V 4-way valve 4-way valve

1 to 4-pin: Drive impulse output;5-pin: +12V;

valve:

1 to 4-pin: Drive impulse output;

5-pin: +12V;

Page 68

No.

Printing

PFC induction wire (blue)

)

COMM/COMM1

Communication interface

JTAG1

DC-BUS1

Bus electric discharging interface (for

testing)

PFC induction wire (yellow)

12 G-OUT

Service Manual

 DHR18CSB21S / DHR24CSB21S / DHR30CSB21S / DHR36CSB21S / DHR42CSB21S

(1) Drive Board

8910131415 1112

2 3 41 5

Printing

Interface

L2_2

N Neutral wire input (white

PWR Control power input

L2-1

P-OUT (Reserved)

W Compressor Phase W

U Compressor Phase U

Interface

L1_1

AC-L

PFC induction wire (brown)

Live wire input (red)

(Reserved)

L1-2

PFC induction wire (white)

(Reserved)

V Compressor Phase V

Page 69

(2)

No.

Printing

No.

Printing

1 N-OUT1

Neutral wire output 1 (white) (only for

18k)

2 N-OUT

Neutral wire output

(white)

3 L-OUT

4 E1

Live wire input (red)

Filtering Board

Service Manual

Interface

Live wire output (red)

E2 (Reserved)

AC-N

Neutral wire input (white)

AC-L

Interface

Grounding wire

Page 70

No.

Printing

No.

Printing

2 L1-1

3 N

4 L2-2

PFC induction wire (yellow)

6 L1-2

PWR

JTAG1

COMM

DC-BUS1

DC bus electric discharging needle

stand (for testing)

DC-BUS

DC bus interface (connect to

filtering board)

12 U

13 V

14 W

Service Manual

 DHR48CSB21S

(1) Drive Board:

121314

AC-

L2-

Interface

Live wire input (red)

Neutral wire input (white)

Control power input

Communication interface

Compressor Phase V

Interface

PFC induction wire (brown)

PFC induction wire (blue)

PFC induction wire (white)

(Reserved)

Compressor Phase U

Compressor Phase W

Page 71

(2) Filtering Board:

No.

Printing

No.

Printing

1 N-OUT

L-OUT

BUS

DC bus interface (connect to drive board)

4 AC-L

Service Manual

Interface

Neutral wire output (white)

DC-

N Neutral wire input (white)

E Grounding wire (screw hole)

Interface

Live wire output (red)

Live wire input (red)

(Reserved)

Page 72

Service Manual

11.4 IPM, PFC Testing Method

11.4.1 Method of Testing IPM Module

(1) Preparation before test: Prepare a universal meter and turn to its diode option

the wires U, V, W of the compressor after it is powered off for one minute.

(2) Testing Steps

Step 1: Put the black probe on the place of P and the red one on the wiring terminal U, V, W

respectively as shown in the following figure to measure the volta

Step 2: Put the red probe on the place of N and the black one on the wiring terminal U, V, W respectiv

as shown in the following figure to measure the voltage between NU, NV and NW.

(3) If the measured voltages between UP, VP, WP, NU, NV, NV are all among 0.3V-0.7V, then it

indicates the IPM module is normal; If any measured valve is 0, it indicates the IPM is damaged.

11.4.2

L2-1respectively as shown in the following figure to measure the voltage between L1-2P and.L2-1 P.

L2-1 respectively as shown in the following figure to measure the voltage betw

Method of Testing PFC Module Short Circuit (only for DHR48CSB21S):

(1) Preparation before test: prepare a universal meter and turn to its diode option, and then remove

the wires L1-2, L2-1 after it is powered off for one minute.

Testing Steps

(2)

Step 1: Put the black probe on the place P and the red one on the wiring terminal L1-2,

Step 2: Put the red probe on the place N and the black on

ge between UP, VP and WP.

e on the wiring terminal L1-2,

een N L1-2 and NL2-1.

, and then remove

ely

(3) If the measured voltages between L1-2P ,L2-1 P, N L1-2 , NL2-1 are all among 0.3V-0.7V, then it

indicates the PFC module is normal; If any measured valve is 0, it indicates the PFC is damaged.

 DHR18CSB21S / DHR24CSB21S /

DHR30CSB21S / DHR36CSB21S / DHR42CSB21S

Page 73

 DHR48CSB21S

Service Manual

Page 74

Service Manual

Step

Illustration

Handling Instruction

1. Remove external casing

1. Remove the top cover and handle;

2. Remove the grille, outer case and right side plate.

2. Remove motor

1. Remove the blade nut and then remove the blade;

2. Remove the motor from motor support.

3. Remove compressor

2. compressor;

12 DISASSEMBLY AND ASSEMBLY PROCEDURES FOR MAIN PARTS

12.1 Outdoor Unit

18k:

Important: Before disassembly and assembly, make sure that the power to the system has been disconnected and verified as voltage free.

Reclaim the refrigerant from the entire system Unsolder the 4-way valve piping assy from

Remove the compressor mounting bolts; Carefully remove the compressor from chassis.

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Service Manual

4. Assemble unit

Step

Illustration

Handling Instruction

1. Remove external casing

1. Remove the top cover and handle;

2. Remove the grille, outer case, front side plate and right side plate.

2. Remove motor

1. Remove the blade nut and then remove the blade;

2. Remove the motor from motor support.

3. Remove compressor

Assemble the unit in the reverse order of disassembly.

24k/30k:

Important: Before disassembly and assembly, make sure that the power to the system has been disconnected and verified as voltage free.

1. Reclaim the refrigerant from the entire system.

2.Unsolder the 4-way valve piping assy from compressor;

3. Remove the compressor mounting bolts;

4. Carefully remove

the compressor from

chassis.

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Service Manual

4. Assemble unit

Step

Illustration

Handling Instruction

1. Remove external casing

1. Remove the top cover and handle;

2. Remove the grille, outer case and right side plate.

2. Remove motor

1. Remove the blade nut and then remove the blade;

2. Remove the motor from motor support.

3. Remove gas liquid separator

3. Remove the gas liquid separator.

Assemble the unit in the reverse order of disassembly.

36k:

Important: Before disassembly and assembly, make sure that the power to the system has been disconnected and verified as voltage free.

1. Reclaimthe refrigerant from the entire system. Unsolder the 4-way valve piping assy from gas

liquid separator;

Page 77

Service Manual

4. Remove compressor compressor;

5. Assemble unit

Step

Illustration

Handling Instruction

1. Remove external casing

1. Remove the top cover and handle;

2. Remove the grille, outer case and right side plate.

2. Remove motor

1. Unsolder the 4-way valve piping assy from

2. Remove the compressor mounting bolts;

3. Carefully remove the compressor from chassis.

Assemble the unit in the reverse order of disassembly.

42k/48k:

Important: Before disassembly and assembly, make sure that the power to the system has been disconnected and verified as voltage free.

Remove the blade nuts and then remove the

blades;

Remove the motors from motor supports.

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Service Manual

3. Remove gas liquid separator.

3. Remove the gas liquid separator.

4. Remove compressor

5. Assemble unit

Removal and Assembly of Fan Motor

Step

Illustration

Handling Instruction

1. Unplug the motor cables

2. Remove the filter sub-assembly and air inlet cover board

Remove the filter sub-assembly from the air inlet frame and use screwdriver to remove the air inlet cover board.

1. Reclaim the refrigerant from the entire system. Unsolder the 4-way valve piping assy from gas

liquid separator;

Unsolder the 4-way valve piping assy from

compressor;

Remove the compressor mounting bolts;

Carefully remove the compressor from chassis.

Assemble the unit in the reverse order of disassembly.

12.2 Indoor Unit

12.2.1 Duct type

Important: Before removing the fan, make sure power to the system is disconnected..

Use screwdriver to remove the electric box cover and unplug the motor cables in electric box.

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Service Manual

3. Remove the screws on fan sub-assembly.

Remove the screws on fan sub-assembly.

5. Loosen the fan and motor.

6. Replace the motor

Disassembly of filter screen for return air

Step

Illustration

Handling Instruction

Disassembly of filter screen for return air

Removing the fan cage enclosure

Rotate the fan cage housing toward

supply opening and remove.

Use a hex wrench to loosen the screws

holding the fan cage to the motor shaft.

Remove outer housing holding motor in

place.

Remove the motor from the support

bracket. Then remove the fan cages from

the motor shafts. Remove the motor from the air inlet and replace with new motor. If

the new motor comes with a mounting

bracket, attach the bracket to the housing

after sliding on the fan cages. Be sure to

tighten the cages onto the motor shafts.

Reassembly of the unit

Important: Make sure that the power supply to the system is turned off before disassembling and protect all the

parts during disassembly. Do not put filter screen near a high temperature heat source.

Reassemble the unit in the reverse order

of disassembly and test operation.

Gently push down on the filters in the slots

and pull/slide out slowly to prevent damage.

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Service Manual

Disassembly of electrical parts box cover panel and electrical parts box

Step

Illustration

Handling Instruction

1. Disassembly of electric box cover

2. Disassembly of electric parts box

Step

Illustration

Handling Instruction

1.Disassembly of cover plate

Important: Make sure that power supply is turned off before disassembling and protect all parts during disassembly,

especially electrical components. Keep all moisture away from the electrical box area and protect the board and components.

The cover can be removed once the screw(s)

are removed.

By removing the screws inside the box, the

electrical box can be completely removed. This

should not be necessary unless the box is

damaged.

Removal of condensate pan

Important: Make sure that the power supply is turned off before disassembling and protect all the parts during disassembly.

To access the condensate drain pan the bottom

plate will need to be removed first. This is done

by removing the cover plate screws.

The condensate pan will drop down once the

Removal of condensate pan

screws holding the pan to the chassis are

removed.

Page 81

Service Manual

Step

Illustration

Handling Instruction

Disassemble the fixing screws on the fan components. (As is shown in graph, circle represents 6 screws.) Disassemble the fastening screws on the fan and motor. Remove the fan. (As is shown in the graph, box represents screws.)

Step

Illustration

Handling Instruction

3. Removal of evaporator

Removal of fan and motor

Important: Make sure that the power supply is turned off before disassembling and protect all the parts during disassembly.

Removal of fan motor

Removal of evaporator Important: Make sure that the power supply is off and protect the copper tube and aluminum fin. Use caution when

removing coil to prevent damage.

Removal of evaporator

screws

Seal plate removal

Remove the cover plate and the screws on

each end of the coil.

Remove the screws holding the seal plate for

the tubing assemblies. At this point the flare

connections may be disconnected provided

that system refrigerant has been reclaimed or

charge has been pumped down into outdoor

unit.

Be aware that if coil is being replaced due to a

leak then refrigerant should be reclaimed as

charge in the system is unknown at this point.

Page 82

12.2.2 Cassette-type Unit

Step

Illustration

Handling Instruction

1. Loosen the screws

Replacement of Fan Motor

holding condensate pan

Service Manual

Use screwdriver to loosen the screws holding the drain pan in place.

Remove the condensate

pan

Loosen the bolts holding

the fan blades in place

Remove the fan blade The fan blade can now be removed.

Carefully remove the condensate pan.

Use a wrench or socket to carefully

remove the fan blade bolts

Page 83

Service Manual

5. Loosen the screws

6. Remove the motor and replace it

Remove the motor and replace it.

7. Tighten the screws

holding the motor in place

Use screwdriver to loosen the screws holding the motor.

holding the motor

Mount the fan blade and

tighten the bolts

Use screwdriver to carefully tighten the screws holding the motor.

Mount the fan blade and use a wrench or

socket to carefully tighten the bolts

holding the fan blade in place. Do not

overtighten as damage may occur.

Reinstall the condensate

pan and tighten the screws

Use a screwdriver to carefully tighten the screws holding the condensate pan

in place. Take care to not overtighten as

damage to pan will occur.

Page 84

Removal and Installation of Condensate Pump

Step

Illustration

Handling Instruction

1. Loosen the screws

3. Pull out the water outlet

4. Take out the pump and replace it

Take out the pump and replace it

holding the condensate pan

Service Manual

Use a screwdriver to loosen the screws holding the condensate pan in

place.

Remove the condensate

pan

pipe and loosen the screws holding the condensate pump.

Remove the condensate pump and replace it.

Pull out the water outlet pipe and use screwdriver to loosen the screws holding the condensate pump.

Page 85

Service Manual

Step

Illustration

Handling Instruction

1. and the 2 screws of the clasps.

Connect the condensate pipe and tighten the screws holding the condensate pump.

Mount the condensate pan and tighten the screws

Connect the condensate pipe and use a screwdriver to tighten the screws holding

the condensate pump in place.

Use a screwdriver to carefully tighten

the screws holding the condensate pan in

place. Damage may occur if over

tightened.

12.2.3 Floor Ceiling Type

Model: DHR30NCB21S / DHR36NCB21S / DHR42NCB21S

Removal of main outer cover

Important: Make sure that the power supply is turned off before disassembling. Use care when disassembling and

do not put the cover or filters near a high temperature heat source.

Unscrew the 2 clasps of the upper grille Disassembly of sub-assy of front grille

Disassembly of right and left panels

Important: Make sure the power supply is off before disassembling and protect all the parts during disassembly.

Do not scratch the outer parts.

Open the grille, disassemble the two

bottom clasps to remove the grille.

Page 86

Service Manual

Disassembly of right and left finishing plates

Disassembly of panel parts

Step

Illustration

Handling Instruction

Disassembly of panel parts

Step

Illustration

Handling Instruction

Step

Illustration

Handling Instruction

Step

Illustration

Handling Instruction

Step Illustration Handling Instruction

Disassemble the screws as shown with a screwdriver and then push upward to remove the right and left panels. Screw

locations are shown in the drawing.

Important: Make sure the power supply to the system is cut off before disassembling and protect all the parts during disassembly. Do not scratch the outer parts.

Remove the three screws on the cover to remove the cover.

Disassembly of electrical box

Important: Make sure that the power supply is turned off before disassembling and protect all the parts during disassembly, especially the components inside the box as these are prone to moisture and impact damage.

Removal of electrical box cover

Disassembly of air deflecting louvers

Important: Make sure the power supply is cut off before disassembling and protect all the parts during disassembly, especially the linkages of the air deflecting louvers.

Disassembly of air deflecting louvers

Remove the three screws as shown in the

picture, then remove the cover.

Remove the air deflecting louvers from the air deflecting louver support assembly, and then remove both ends from the

stepper motor linkage.

Removal of condensate pan

Important: Make sure the power supply is turned off before disassembling and protect all the parts during disassembly.

Removal of the

condensate pan

Once the outer cover has been removed, then the condensate pan can be accessed and removed.

Page 87

Service Manual

Disassembly of evaporator components

Step

Illustration

Handling Instruction

Step

Illustration

Handling Instruction

Step

Illustration

Handling Instruction

1. Disassembly of front

Important: Make sure that the power supply is turned off. Work deliberately to avoid damaging the copper tube

assemblies and the fins of the coil.

Remove the six screws of the coil, three

Removal of evaporator

coil

Removal of discharge air guide

Important: Make sure that the power supply is off before disassembling and protect all the parts during disassembly.

screws of the water channel and the two screws of the condensate deflector to remove the evaporator.

Removal of the

discharge air guide

Disassembly of fan and motor components

Important: Make sure that the power supply is turned off before disassembling and protect all the parts

during disassembly, especially the fastening screws for the fans.

and back fan cage housings

Remove the display board, mounting support and mounting plate of the motor in this order.

Press the buckle at the joints of front and back housings with hands and pull upward to remove the front housing. Then remove the screws on the back housing. Lift the buckle of the back housing with hands and remove it.

Removal of fan assemblies

Unscrew the two screws of the center coupling, take out the main shaft and blower wheels, then loosen the set screws of the blower wheels to remove them from

the main shaft.

Page 88

Service Manual

Unscrew the 3 screws and 2 nuts of support to remove the mounting support.

Step

Illustration

Handling Instruction

Step

Illustration

Handling Instruction

Step

Illustration

Handling Instruction

Removal of the bearing mounting plates

Loosen the two screws of the motor

Removal of motor

Removal of right and left fixing plates

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mounting bracket andremove. The motor

can then be removed.

Removal of right and left mounting plates

Disassemble the bolts on right and left mounting plates with tools. (As is shown by the arrows in the drawing.)

Model: DHR18NCB21S / DHR24NCB21S / DHR48NCB21S

Removal of the main grille cover

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Unscrew the 2 clasps of the upper grille and

Removal of grille sections

Removal of the left and right panels

Important: Make sure the power supply is turned off before disassembling and protect all the parts during

disassembly. Do not scratch the outer panels.

the two screws of the clasps.

Open the grille, disassemble the two

bottom clasps to remove the grille.

Removal of right and left finishing panels

Remove the screws as shown in the drawing

and then push upward to remove the right and left panels.

Page 89

Service Manual

Disassembly of panel parts

Step

Illustration

Handling Instruction

Step

Illustration

Handling Instruction

Step

Illustration

Handling Instruction

Step

Illustration

Handling Instruction

Important: Make sure the power supply is turned off before disassembling and protect all the parts during

disassembly. Do not scratch the panels.

Panel removal Remove the three screws on the cover to

remove the cover.

Removal of the electrical box

Important: Make sure that the power supply is turned off before disassembling and protect all the parts

during disassembly, especially the components inside the box to prevent moisture and impact damage.

Removal of electrical box cover

Removal of the discharge air louvers

Important: Make sure the power supply is turned off before disassembling and protect all the parts during

disassembly, especially linkages and connections of the louvers.

Removal of the

discharge air louvers

Removal of the condensate pan

Important: Make sure the power supply is turned off before disassembling and protect all the parts during disassembly.

Remove three screws as shown by the arrows in the drawing on the left and remove the electrical box cover.

Remove the discharge air louvers from the support assembly, and then remove both ends from the stepper motor linkages.

Condensate pan

removal

Once the outer cover has been removed, then the condensate pan can be accessed and removed.

Page 90

Service Manual

Step

Illustration

Handling Instruction

Step

Illustration

Handling Instruction

Step

Illustration

Handling Instruction

Step

Illustration

Handling Instruction

Evaporator coil removal

Important: Make sure that the power supply is cut off and protect the copper tube and aluminum fin if coil is to be re-used.

Remove the six screws of the evaporator

Removing the coil

Removal of the discharge air guide

Important: Make sure that the power supply is turned off before disassembling and protect all the parts during disassembly.

coil, three screws of the water channel and the two screws of the condensate reflector to remove the evaporator coil.

Removal of the

discharge air guide

Removal of fan and motor components

Important: Make sure that the power supply is turned off before disassembling and protect all the parts during disassembly, especially the fastening screws for fans.

Disassembly of front and back fan cage

housings

Removal of fan and motor components

Remove the display board, mounting support and mounting plate of the motor in this order.

Press the buckle at the joints of front and back of the fan cage housings by hand and pull upward to remove the front housing. Then remove the screws on the back housing. Lift the buckle of back housing with hands and remove it.

Important: Make sure that the power supply is turned off before disassembling and protect all the parts during disassembly, especially the fastening screws for fans.

Unscrew the two screws of the center coupling,

Removal of fans

take out the main shaft and blower wheels, then

loosen the screws of the blower wheels to

remove them from the main shaft.

Page 91

Service Manual

Step

Illustration

Handling Instruction

Removing the bearing mounting plates

Removal of motor

Removal of right and left mounting plates

Important: Make sure that the power supply is turned off before disassembling and protect all the parts during disassembly.

Removal of right and left mounting plates

Remove the three screws and two nuts to

remove the mounting plate.

Loosen the two screws of the motor attaching clamp, remove the motor attaching clamp and motor attaching clamp subassembly to remove the motor.

Disassemble the bolts on right and left mounting plates with tools. (As is shown by the arrows in the drawing.)

Page 92

Page 93

Product improvement, specifications and appearance in this manual are subject to change without prior notice.

LIT - 12012189

Johnson Controls DHR18CSB21S, DHR36CSB21S, DHR24CSB21S, DHR30CSB21S, DHR42CSB21S Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual