Johnson Controls DHR24CSB21S, DHR36CSB21S, DHR30CSB21S, DHR18CSB21S, DHR42CSB21S Installation And Maintenance Manual

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Installation

and

Maintenance

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

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.

P5415467

Table of Contents

1. INTRODUCTION AND SAFETY SUMMARY ......................................................................................... i

2. INDOOR UNIT INSTALLATION ................................................................................................................1

2.1 Installation of Duct Type ................................................................................................................. 1

2.2 Installation of Floor Ceiling Type ................................................................................................10

2.3 Installation of Cassette Type ........................................................................................................16

3. OUTDOOR UNIT INSTALLATION............................................................................................................26

3.1 Before Installation .......................................................................................................................... 26

3.2 Installation Site ................................................................................................................................26

3.3 Caution for Installation ................................................................................................................. 27

3.4 Dimension Data ................................................................................................................................27

4. REFRIGERATION PIPING WORK ........................................................................................................... 28

4.1 Refrigeration Piping Work Procedures and Caution in Connecting ...................................28

4.2 Specification of Connection Pipe .................................................................................................33

5. ELECTRIC WIRING WORK ........................................................................................................................33

5.1 Wiring Precautions ...........................................................................................................................33

5.2 Electrical Wiring................................................................................................................................ 34

6. MAINTENANCE TROUBLESHOOTING.................................................................................................. 41

6.1 Main Control Malfunction ............................................................................................................... 41

6.2 Description of Drive Malfunction ..................................................................................................43

7. FLOW CHART OF TROUBLESHOOTING ............................................................................................. 45

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

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

7.3 Interface ..............................................................................................................................................57

7.4 IPM, PFC Testing Method ...............................................................................................................63

8. WIRING DIAGRAM ....................................................................................................................................64

8.1 Outdoor unit ...................................................................................................................................... 64

8.2 Indoor unit ......................................................................................................................................... 67

CUSTOMER SERVICE, TECHNICAL SUPPORT........................................................................................ 71

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.

P5415467

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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iii

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.

P5415467

● 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.

P5415467

2. INDOOR UNIT INSTALLATION

2.1 Installation of Duct Type

2.1.1 Before Installation

After receiving the machine, please check for any transport damage. If finding any surface or internal

damage, please immediately report to the transport company or equipment company in writing.

After receiving the machine, please check the unit and accessories in reference to the packing list.

Ensure that the model is correct and the machine is in good condition. Please also check if the specification

and quantity of accessory parts are correct.

Determine the correct handling route and methods to avoid damaging the unit or causing possible

hazard. For the sake of protection and safety, it is suggested to move the unit with the packaging box.

Even though it is not the best to do this under some special situations,

thus to avoid loosening or falling during handling.

Confirm if the installing foundation is solid. When this unit is to be installed on the metal section of the

building, make sure that the electrical insulation must comply with applicable standards.

Ensure that the place of installation is far from the area where the inflammable or explosive

substances are stored, thus to avoid possible explosion or fire due to leakage.

do not remove the packaging box,

2.1.2 Installation Site

Ensure the top mounting bracket is strong enough to withstand the weight of the unit.

Ensure condensate pipe has convenient flow of water.

Ensure there is no obstacle blocking the return air inlet and exhaust outlet, so as to ensure

sound air circulation.

The installation spaces required by the drawing must be ensured, so as to provide enough space

for service and maintenance.

The installation site must be far away from

The indoor unit is of ceiling mount (indoor unit is hidden inside the ceiling).

The indoor and outdoor units, the power cable and the connecting electrical lines must be at least

40 inches from any TV set or radio. This is to avoid image interference or noise of the TV set or radio.

n if the distance is 40 inches, noise can also exist if there is a strong electric wave.)

(Eve

heat source, leakage of inflammable gas or smoke.

2.1.3 Caution for Installation

Generally, the unit is installed indoors on a ceiling. For ceiling mounting, ensure that the

hangers on

To meet the noise and vibration requirements, the unit should be installed by using a rubber pad

(thickness ≥20mm (13/16inch)) and rubber connector.

Insert a M10 expansion bolt into the hole. Drive a nail into the bolt. Refer to the profile dimensions

ceiling have adequate strength to support the weight of the unit.

drawing of the indoor unit for the distance between the holes. Refer to Figure 3-1-1 for the installation of the

expansion bolt.

Air-conditioning Unit

Ceiling-mount Screw

Hanger

Figure 3-1-1 Figure 3-1-2

Hook

Screw

Nut

Figure 3-1-3

Install the hanger onto the indoor unit as Figure 3-1-2 and Figure 3-1-3 shows.

Install the indoor unit at the ceiling as Figure 3-1-4 shows.

Air Intake

Precautions for unfavorable installation:

Figure 3-1-4

Screw

Hanger

Nut

Air Supply

≤48mm(1-7/8inch)

"I" Detail

The preparation of all pipes (connecting pipes and condensate pipes) and cables (connecting lines of

wire zone controller, indoor unit and outdoor unit) must be ready before the installation, so as to achieve

smooth installation.

Drill an opening on the ceiling depending on the ceiling type. Providing additional support may be required to prevent vibration and ensure the evenness of the ceiling. Consult with the user or a construction company

for advice.

In case the strength of ceiling is not enough, use angle iro

n sections to set up a beam support.

Place the unit at the beam and secure it.

Level inspection of the indoor unit

After the indoor unit is installed, it is required to check the level of the whole unit. The unit must be

placed horizontally, but the condensate pipe shall be installed obliquely, so as to facilitate the drainage of

condensate.

Level Instrument

Condensate

Pipes

2.1.4 Dimension Data

 For the units: 18k

Air Intake

Enlarged View

Condensate Pipe

Figure 3-1-5

Air Supply

As the inside of the unit is in the negative pressure status, it is required to set up a backwater elbow. The requirement is:

A=B≥(0.145P/10000+20)/25.4(inch)

P is the absolute pressure inside the unit. The unit of the pressure is psig.

 For the units: 24k~42k

 For the units: 48k

Item

Model

B C D E F G H I J

945

(37-1/4)

618

(24-3/8)

738 (29)

892

(35-1/8)

1037

(40-7/8)

721

(28-3/8)

738 (29)

125

(4-7/8)

203

(8)

266

(10-1/2)

1101

(43-3/8)

517

(20-3/8)

820

(32-1/4)

1159

(45-5/8)

1279

(50-3/8)

558 (22)

1002

(39-1/2)

160

(6-1/4)

235

(9-1/4)

268

(10-1/2)

1011

(39-3/4)

748

(29-1/2)

820

(32-1/4)

1115

(43-7/8)

1226

(48-1/4)

775

(30-1/2)

979

(38-1/2)

160

(6-1/4)

231

(9-1/8)

290

(11-3/8)

1177

(46-3/8)

646

(25-3/8)

852

(33-1/2)

1150

(45-1/4)

1340

(52-3/4)

750

(29-1/2)

953

(37-1/2)

190

(7-1/2)

316

(12-1/2)

350

(13-3/4)

Name & Shape

QTY

Notes

Installation and Operating

Instructions

Insulation materials for gas pipe

Used for gas pipe connector on indoor unit.

Insulation materials for liquid

pipe

Used for liquid pipe connector on indoor unit.

Insulation materials for drainage

pipe

Used for wrapping the condensate pipe and

rubber plug.

Nut

To connect liquid pipe.

Nut

To connect gas pipe.

Nut M6 with gasket

Use for fixing the hanger hook.

Nut M10 with gasket

Use for fixing the hanger hook.

Nut M10

4 sets, used for ceiling mounting of the indoor

spring gasket

Hook

Used for ceiling mounting of the indoor unit.

DHR18NDB21S

D E

Figure 3-1-6

Table 3-1-1

Unit

: mm (inch)

DHR24NDB21S

DHR30NDB21S

DHR36NDB21S

DHR42NDB21S

DHR48NDB21S

Table 3-1-2 Installation Accessor

ies List for Duct-type Indoor Unit

unit.

Wired zone controller

Screw M4 2

To fix the base plate of wired zone c

and installation hole of the wall together.

ontroller

2.1.5 Installation Clearance Data

Nut with Washer

250mm

(9-7/8inch)

Nut Spring Washer

2500mm

஘

(98-3/8inch)

250mm

(9-7/8inch)

Figure 3-1-7

Warning! The height of installation for the indoor unit should be 2.5m (8-1/5ft) above.

2.1.6 Condensate Piping Work

Installation of Condensate Pipeline:

Install the condensate hose in accordance with the instructions in this

enough to prevent condensation. Problems with the piping may lead to water leaks.

installation manual and keep the a rea warm

(1) (Install the condensate hose with downward gradient (1/50 to 1/100) and no risers or traps are

used for the hose (Figure 3-1-8).

(2) Be sure there i

s no crack or leak on the condensate hose to avoid the formation of air pockets

(Figure 3-1-8).

(3) When the hose is long, install supporters (Figure 3-1-9).

(4) Always use the condensate

Arrange the condensate

√

hose lower than this drain port

hose which has been insulated properly.

Condensate hose

Rise

Trap

Air bleeding

Figure 3-1-8

Supporter

Always check that the drain cap is installed to the unused drain port and is fastened with the nylon fastener. If the drain

cap is not installed, or is not sufficiently fastened by the nylon fastener, water may drip during the cooling operation.

Condensate Pipe

1~1.5m(3-2/7~5feet)

Condensate hose

Figure 3-1-9 Figure 3-1-10

Enlarged View

Condensate Pipe

As the inside of the unit is in the negative pressure status, it is required to set up a backwater elbow. The requirement is:

A=B≥(0.145P/10000+20)/25.4(inch)

P is the absolute pressure inside the unit. The unit of the pressure is psig.

Figure 3-1-11

(5) Use a suitable condensate hose, and see Table 3-3-3 for its size.

(6)

There is a drain port on both the left and right sides. Select the drain port

to match the local

conditions (Figure 3-1-10).

(7) When the unit is shipped from the factory, the drain port is defaulted to be the one on the left side

(electric box side). T

he port on right side has been plugged.

(8) When using the drain port on the right side of the unit, reinstall the drain cap to the left side drain

port (Figure 3-1-12).

Drain port

Drain cap

Fastener

Figure 3-1-12

(9) Be sure to insulate where

the drain port and the condensate hose is connected (Figure

3-1-13).(10) The unused drain port also should be insulated properly (Figure 3-1-14).

Condensate hose insulation

Insulated condensate hose

Unit

Condensate hose insulation

Drain port

Unit

Drain cap

Drain port

Insulated Condensate hose

0mm(0inch)

Drain cap

0mm(0inch)

Figure 3-1-13 Figure 3-1-14

(11) There is adhesive on one side of the insulation so that after removing the protective paper over it

the insulation can be directly attached to the condensate

hose.

(12) Considerations for the unit with the condensate pump:

For the unit with the condensate pump, only one drain port at the side close to the electric box

is prep

See table 3 for the size of the drain port of the unit with the condensate pump, which is different

ared and only through it can the condensate hose can be connected.

from that of the unit without the condensate pump.

For the unit with the condensate pump, two drain ports at the bottom are defaulted to be

factory

plugged with drain caps. After the installation of the condensate hose, these two drain

ports also need to be insulated properly with the same way as aforementioned.

The condensate hose for the unit with

the condensate pump should be arranged as shown

in the figure below.

Ceiling

≤300mm(11-3/4inch)

1000~1500mm(39-3/8~59inch)

Condensate hose(attachment)

Hoisting stand

Drain raising hose

Clamp(attachment)

≤100mm

(39-3/8inch)

Figure 3-1-15

ķ The vertical height of the condensate hose should be 75mm (3inch) or less so that it is

unnecessary for the drain port

Condensate hose(attachment)

to withstand additional force.

≤75mm(3inch)

≤1000mm

(39-3/8inch)

Figure 3-1-16

8 When multiple condensate hoses are used, their installation should be performed as

shown in the figure below.

T-joint converging condensate pipes

Item

Model

Supply Air Outlet

Return Air Inlet

A B C

123(4-7/8)

736(29)

710(28)

166(6-1/2)

158(6-1/4)

818(32-1/4)

994(39-1/8)

195(7-5/8)

158(6-1/4)

818(32-1/4)

994(39-1/8)

195(7-5/8)

158(6-1/4)

818(32-1/4)

1000(39-3/8)

206(8-1/8)

158(6-1/4)

818(32-1/4)

1000(39-3/8)

206(8-1/8)

190(7-1/2)

850(33-1/2)

940(37)

286(11-1/4)

0~1000mm(0~39-3/8inch) ≥100mm(3-7/8inch)

2.1.7 Installation of air duct

Dimensions of the Supply Air Outlet/Return Air Inlet

21mm(7/8inch)

Figure 3-1-18 Su

T-joint converging condensate pipes

Figure 3-1-17

pply Air Outlet

DHR18NDB21S

DHR24NDB21S

DHR30NDB21S

DHR36NDB21S

DHR42NDB21S

DHR48NDB21S

Figure 3-1-19 Return Air Inlet

Table 3-1-3

Unit: mm (inch)

2.1.8 Installation of the Supply Air Duct

The maximum length of the duct means the maximum length of the supply air duct plus the maximum length of the

return air duct.

Among all supply air outlets, at

least one should be kept open.

ectangular duct

No.

Name

No.

Name

Hanger

Filter

Pipe

Main Air

Supply Pipe

Canvas Air Pipe

Air Supply

Outlet

Air Intake

(1) Installation of the Rectangular Duct.

Figure 3-1-20

ķ.

Table 3-1-4 Installation of the r

Air Intake

ĸ. The duct is rectangular and connected with the air inlet/outlet of the indoor unit.

Bottom Return Air Installation only for Units 18k

(2) The default installation location of the rectangular flange is at the back and the return air cover

plate is at the bottom, as shown in Figure 3-1-21

Bottom Return Air

Rectangular Flange

Rear Return Air

Return Air Cover Plate

Figure 3-1-21

(3) If a bottom return air is desired,

just change the place of the rectangular flange and the return air

cover plate.

(4) Connect one end of the return air duct to the return air outlet of the unit by rivets and the other to

the return air louver. For the sake of convenience to freely adjust the height, a cutting of

canvas duct will be helpful, which can be reinforced and folded by 8# iron wire.

(5)

More noise is likely to be produced in the bottom return air mode than the backward return air

mode, so it is suggested to install a silencer and a static pressure box to minimize the noise.

(6) The installation method can be chosen with considering the conditions of the building and

maintenance etc., as shown in Figure 3-1-22.

No.

Name

No.

Name

Return Air Inlet (with filter)

Indoor unit

Canvas Duct

Supply Air Duct

Return Air Duct

Grille

Supply air

Return air

Install the return air duct(a) Install the return air duct(b)

Supply air

Return air

Figure 3-1-22

Table 3-1-5 Installation of the return air duct

2.2 Installation of Floor Ceiling Type

2.2.1 Before Installation

After receiving the unit, please check for any transport damage

damage, please immediately report to the transport company or equipment company in writing.

After receiving the machine, please check the unit and accessories in reference to the packing list.

Ensure that the model is correct and the machine is in good condition. Please also check if the specification

and quantity of accessory parts are correct.

Determine the correct handling route and methods, thus to avoid damaging the unit or causing

possible hazard. For the sake of protection and safety, it is suggested to move the unit with the packaging

box. Even though it is not permitted to do like this under special occasions, do not remove the packaging

box, thus to avoid loosening or falling during handling.

Confirm if the installing foundation is solid. When this unit is to be installed on the metal section of the

building, make sure that the electrical insulation must comply with applicable standards.

Ensure that the place of installation is far from the area where the inflammable or explosive

substances are stored, thus to avoid possible explosion or fire due to leakage.

. If finding any surface or internal

2.2.2 Installation Site

(1) Install the unit at a place strong enough to withstand the weight of the unit.

(2) The air inlet and outlet of the unit s

(3) Leave service space around the unit as required in Figure 3-1-23.

hould never be clogged so that the airflow can reach every

corner of the room.

 Floor type

 Ceiling type

Figure 3-1-23

(4) Install the unit where the condensate pipe can be easily installed.

(5) The space from the unit to the ceiling should be kept

convenient service.

as much as possible so as for more

2.2.3 Indoor Unit Installation

(1) Determine the location of the hanger through the paper template, and then remove the paper

template.

Figure 3-1-24

(2) Insert the anchor bolts into the drilled holes, and drive the pins completely into the anchor bolts

with a hammer.

(3) First, unfix two buckles on the grille as s

hown on the picture. Remove the screws under the

buckles by a screwdriver and then open the inlet grille.

Remove the screw

Figure 3-1-25

(4) Remove the screws shown in the picture. Push the side plate as per the arrow direction and

take it down.

Remove the screw

Figure 3-1-26

(5) Put the hanger bolt into the clasp of the indoor unit and tighten screws on the hanger to prevent

the indoor unit from moving.

(6) Reinstall and tighten the right and left side panels.

 Floor type

Wall

Paper template

Left side panel

Right side panel

Figure 3

-1-27

 Ceiling type

Ceiling

Suspension

≥40(1-5/8inch)

bolt

Nut

Spring washer

Left side panel

Nut

Hanger

Right side panel

Figure 3-1-28

(7) Adjust the height of the unit to make the condensate pipe slant slightly downward so that the

drainage

will become much smoother.

2.2.4 Leveling

The water level test must be done after installing the indoor unit to make sure the unit is

horizontal, as shown below.

Horizontal tester

Figure 3-1-29

2.2.5 Dimension Data

7/8)

280(11)

5/8)

280(11)

1700(66-7/8)

245(9-5/8)

1634(64-3/8)

280(11)

700(27-1/2)

Figure 3-1-30

Table 3-1-6

Model A B C D H

DHR18NCB21S

DHR24NCB21S

DHR30NCB21S

DHR36NCB21S

DHR42NCB21S

DHR48NCB21S

1220(48) 225(8-

1420(55-7/8)

245(9-

1158(45-5/8)

1354(53-1/4)

Unit: mm (inch)

700(27-1/2)

2.2.6 Condensate Piping Work

2.2.6.1 Precautions When Doing the Piping Work

(1) Keep piping as short as possible and slope it downwards at a gradient of at least 1/100 so that air

may not remain trapped inside the pipe.

(2) Keep pipe siz

(3) Install the condensate piping as shown and take measures against condensation. Improperly

rigged

piping could lead to leaks and eventually property damage.

Extension condensate piping (commercially available)

e equal to or greater than that of the connecting pipe.

Insulating tube

(commercially available)

Insulating tape (accessory)

Figure 3-1-31

Indoor unit

condensate hose

(4) Connect the condensate hose (Figure 3-1-32).

Condensate hose must

slope downward.

Allow no trap to form in the piping

Do not allow end

of hose to touch water

Figure 3-1-32

2.2.6.2 Installing the Condensate Pipes

(1) For determining the position of the condensate hose, perform the following procedures.

(2) Insert the condensate pipe to the drain outlet of

with tape (Figure 3-1-33).

(3) Connect the extension condensate

clamp with tape.

pipe to the condensate pipe and then tighten the

Drain pan

Seal

Drain hose

the unit and then tighten the clamp securely

≤4mm(1/8inch)

Figure 3-1-33 Figure 3-1-34 Figure 3-1-35

Tighten the clamp until the screw head is less than 4mm

(1/8inch) from the hose (Figure 3-1-34).

ķ- Metal clamp ĸ- Drain hose Ĺ- Grey tape

Insulate the pipe clamp and the condensate hose using heat insulation sponge ( Figure 3-1-35).

ķ- Metal clamp ĸ- Insulation sponge

Note:

Step 1 to Step 3 have been finished by the manufacturer.

(4) When condensate hose requires extension, obtain an extension hose available commercially.

(5) After connecting the local condensate hose, tape the slits of the heat insulation tube.

(6) Connect the condensate hose to the local condensate pipe. Position the interconnecting wire

in the same

direction as the piping

2.2.6.3 Connecting the Condensate Hose

(1) Connect the extension auxiliary pipe to the local piping.

(2) Prepare the local piping at the connec

installation

Note:

Be sure to place the condensate hose as shown in the figure below, in a downward

drawin

gs.

tion point for the condensate pipe, as shown in the

sloping direction.

Bottom-right piping

2.2.6.4 Testing of Condensate Piping

Condensate pan

Condensate hose

ķRight side piping

Figure 3-1-36

(1) After

(2) As shown in the figure, pour water into the condensate pan from the right side to check that

water flows

pipi

ng work

freely from the condensate hose.

is finishe

Ceiling type Floor type

d, c

heck if

drainage flows freely.

Figure 3-1-37

2.3 Installation of Cassette Type

2.3.1 Before Installation

After receiving the machine, please check for any transport damage. If finding any surface or internal

damage, please immediately report to the transport company or equipment company in writing.

After receiving the machine, please check the unit and accessories in reference to the packing list.

Ensure that the model is correct and the machine is in good condition. Please also check if the specification

and quantity of accessory parts are correct.

Determine the correct handling route and methods to avoid damaging the unit or causing possible

hazard. For the sake of protection and safety, it is suggested to move the unit with the packaging box.

Even though some circumstances may limit this, do not remove the packaging box to avoid loosening or

falling during handling.

Confirm if the installing foundation is solid. When this unit is to be installed on the metal section of the

building, make sure that the electrical insulation must comply with applicable standards.

Ensure that the place of installation is far

substances are stored in order to avoid possible explosion or fire due to leakage.

from the area where the flammable or explosive

2.3.2 Installation Site

mm (inch)

255(10)

260(10-1/4)

340(13-3/8)

320(12-5/8)

Select an installation site where the following conditions are fulfilled and that meets your customer's

approval.

(1) Obstructions should be moved

away from the intake or outlet vent of the indoor unit so that the airflow can

be blown throughout the room.

(2)

Make sure that the installation meets the requirement of the schematic diagram of installation

spaces.

(3) Select the place where it can withstand four tim

es the weight of the indoor unit and would not

increase operating noise and vibration.

(4) Ensure horiz

ontal position of

the installation place.

(5) Select the place where it is easy to drain condensate water, and connect with the outdoor unit.

(6) Make sure that there is enough space for care and maintenance, and the height between the

indoor unit and ground is above 1800mm

(7)

When installing the suspension bolt, check if the installation place can withstand four times the

weight

Note:

of the unit. If not, reinforce it before installation.

There could be a large amount of greasy dirt accumulated on the fan, heat exchanger and water

(6ft).

pump located in a dining room and kitchen, which would reduce the capacity of the heater exchanger,

and lead to leakage and abnormal operation of the water pump.

≥1500mm

(59inch)

DHR18NKB21S

DHR24NKB21S

DHR30NKB21S

DHR36NKB21S

DHR42NKB21S

DHR48NKB21S

>20mm(3/4inch)

≥1500mm

(59inch)

≥2500mm(98-3/8inch)

Figure 2-3-2

Table 2-3-2

Models

2.3.3 Installing the Main Body Unit

Nut(field supplied)

Gas(attachment)

Hoisting stand

Tighten(double nuts)

[Fix the hoisting stand firmly]

Insert

Gasket anchor board(attachment)

[Fix the gasket firmly]

One bolt located at one corner of the outlet pipe should be fixed on one corner of the drainage slot.

paper template

Bolt(attachment)

Water level

Polyethylene pipe

Center of the ceiling opening

Bolt(attachment) [Fix the paper template]

Figure 3-1-39

(1) Install the hoisting stand on the hoisting screw by using nuts and gaskets at both the upper and

lower sides of the hoisting stand. To prevent the gasket from breaking off, a gasket anchor board

can be helpful.

(2) Install the paper template on the unit, and secure the condensate pipe at the outlet vent.

(3) Adjust the unit to the best position.

(4) Check if the unit is installed horizontally at four directions. If not, the water pump and the float

switch would function improperly and even lead to water leakage.

(5) Remove the gasket anchor board and tighten the remaining nut.

(6) Remove the paper template.

2.3.4 Installing the Suspension Bolts

(1) Using the installation template, drill holes for bolts (four holes) (Figure 3-1-40).

(2) Install the bolts to the ceiling at a place strong enough to hang the unit. Mark the bolt positions

from the installation template. With a concrete drill, drill for 12.7mm (1/2inch) diameter holes

(Figure 3-1-41).

Insert the anchor bolts into the drilled holes, and drive the pins completely into the anchor bolts

(3)

with a hammer (Figure 3-

Figure 3-1-40 Figure 3-1-41 Figure

1-42).

3-1-42

2.3.5 Leveling

The water level test must be done after installing the indoor unit to make the unit is horizontal, as

shown below.

Horizontal tester

Figure 3-1-43

2.3.6 The Panel Installation

(1) See the figure below for the positions of the front panel

Figure 3-1-44

(2) Place the panel at the unit, and latch the hooks beside and opposite the swing flap motor.

(3) Latch other two hooks.

(4) Tighten four hexagonal screws under the latches about 15mm (5/8inch).

(5) Adjust the panel along the direction indicated by the arrow as shown in Figure 3-1-45.

(6) Tighten the screws until the thickness of the sealing material between the panel and the indoor

unit reduces to 5~8mm (1/4~3/8inch).

and the connecting pipe.

Swing flap motor

Indoor unit

Ceiling

Air outlet

Piping position

Latch

Indoor unit

5~8mm(1/4~3/8inch)

Panel

Hook

Figure 3-1-45

(7) Improper screwing of the screws may cause the troubles shown in Figure 3-1-46.

Air leak

Condensate

Figure 3-1-46

(8) If gap still exists between ceiling and decorative

height of the indoor unit (Figure 3-1-47).

Adjustment of the indoor unit body from the holes

in the corner of the panel is possible if the indoor unit can always be kept horizontal and the condensate pipe will be unaffected.

No gap is allowed

Figure 3-1-47

panel after tightening the screws, readjust the

(9) Wire the swing flap motor as shown in Figure 3-1-48.

Item

Model

B C D E F G H I J

670

(26

3/8)

596

(23

1/2)

592

(23

1/4)

575

(22

5/8)

145

3/4)

240

1/2)

665

(26

1/8)

236

1/4)

575

(22

5/8)

505

(19

7/8)

Figure 3-1-48

2.3.7 Dimension Data

For the units: 18k

Connect them to the main body according to the size of terminals

DHR18NKB21S

For the units: 24k~42k

Table 3-1-8 Unit: mm (inch)

Table 3-1-9

Unit: mm (inch)

Item

Model

B C D E F G H

950

(37-3/8)

840

(33-1/8)

780

(30-3/4)

680

(26-3/4)

160

(6-1/4)

240

(9-1/2)

917

(36-1/8)

215

(8-1/2)

993

(39-1/8)

950

(37-3/8)

840

(33-1/8)

780

(30-3/4)

680

(26-3/4)

160

(6-1/4)

320

(12-5/8)

917

(36-1/8)

215

(8-1/2)

993

(39-1/8)

950

(37-3/8)

840

(33-1/8)

780

(30-3/4)

680

(26-3/4)

160

(6-1/4)

320

(12-5/8)

917

(36-1/8)

215

(8-1/2)

993

(39-1/8)

950

(37-3/8)

840

(33-1/8)

780

(30-3/4)

680

(26-3/4)

160

(6-1/4)

320

(12-5/8))

917

(36-1/8))

215

(8-1/2)

993

(39-1/8)

Model

1040(41)

7/8)

1/8)

3/4)

3/8)

DHR24NKB21S

DHR30NKB21S

DHR36NKB21S

DHR42NKB21S

For the units: 48k

D A

Bottom face of ceiling

Figure 3-1-49

Table 3-1-10

Unit: mm (inch)

Item

DHR48NKB21S

A B C D E F

910(35-

842(33-

788(31)

170(6-

290(11-

2.3.8 Installation of Condensate Piping

(1) Keep piping as short as possible and slope it downwards at a gradient of at least 1/100 so that air

may not remain trapped inside the pipe.

(2) Keep pipe size equal to or greater

(3) Install the condensate piping as shown and take measures against condensation. Improperly

rigged

piping could lead to leaks and eventually

Extension condensate

piping (commercially

available)

Insulating tube

(commercially available)

than that of the connecting pipe.

property damage.

Indoor unit

condensate hose

Insulating tape (accessory)

Figure 3-1-50

2.3.9 Installing the Condensate Pipes

Tighten the clamp until the screw head is less then 4mm

(1/8inch) from the hose.

(1) Insert the condensate pipe to the drain outlet of the unit and then tighten the clamp securely with

tape.

(2) Connect the extension condensate pipe to the condensate

tape.

Insulate the pipe clamp and the condensate hose

ķ Metal clamp (accessory)

ĸ Insulation sponge (accessory)

using heat insulation sponge.

ķ Metal clamp

ĸ Condensate hose (accessory)

rey tape (accessory)

(3) When unifying multiple condensate pipes, install the pipes as in Figure 3-1-51. Select converging

condensate pipes whose gauge is suitable for the operating capacity of the unit (take the cassette

type unit for example).

pipe and then tighten the clamp with

(4) When the condensate hos

pipe (field supplied) to it.

(5) If the air flow of indoor unit is

of outdoor air. Therefore, U-type water trap should

unit (Figure 3-1-52).

(6) Install one water trap for each unit.

(7) Installation of wa

Figure 3-1-52 Figure 3-1-53 Figure 3-1-54

ter trap should consider easy cleaning in

Figure 3-1-51

e can

not

keep a sufficient gr

adie

nt, it is necessary to fit

a riser

high, this might cause negative pressure and result in return suction

be designed on the drainage side of each indoor

the future.

(8) Connection of drainage branch pipe to the standpipe or horizontal pipe of drainage main pipe.

(9) The horizontal pipe cannot be connected to the vertical pipe at a same height. It can be connected

in a manner as shown below:

NO.1: Attach the 3-way connection of the condensate pipe joint as shown in Figure 3-1-55.

NO.2: Attach the drain elbow as shown in Figure 3-1-56.

NO.3: Attach the horizontal pipe as shown in Figure 3-1-57.

3-way connection of condensate pipe joint

Connection of drain elbow

Connection of horizontal pipe

Figure 3-1-55 Figure 3-1-56 Figure 3-1-57

2.3.10 Precautions When Doing Riser Piping Work

(1) Make sure that heat insulation work is executed on the following two spots to prev

water leakage due to condensation.

Connect the condensate hose to the drain lift pipe, and insulate them.

Connect the condensate hose to the drain outlet on the indoor unit, and tighten it with the clamp.

ent any possible

Figure 3-1-58

(2) Make sure the lift pipe is at most 280mm (11inch).

(3) Stand the lift pipe vertically, and make sure it is not further than 300mm (11-3/4inch) from the

base of the drain outlet.

(4) Secure a downward gradient of 1/100 or more for the drain pipe. To accomplish this, mount

supporting brackets at an interval of 1~1.5m (3-2/7~5feet).

1~1.5m(3-2/7~5feet)

√ (Correct) 1/100 or more gradient

× (wrong

)

Figure 3-1-59

(5) The incline of attached condensate hose should be 75mm (3inch) or less so that the drain

outlet does

not have to withstand additional force.

Condensate hose(attachment)

≤75mm(3inch)

≤1000mm(39-3/8inch)

Figure 3-1-60

2.3.11 Testing of Condensate Piping

After piping work is finished, check if drainage flows freely

. Shown in

approximately 1liter of water slowly into the condensate pan and check drainage flow during COOL

running.

Condensate hose

Drain vent for repair use (plastic stopper is included) (drain the water in waterspout by this outlet vent)

the Fi

gure 3-

Test hole cover

1-61, a

Above 100mm(3-7/8inch)

Test hole

Plastic water pot [The length of

the pipe should be about

100mm(3-7/8inch)].

Figure 3-1-61

3. OUTDOOR UNIT INSTALLATION

3.1 Before Installation

After receiving the unit, please check for any transport damage. If finding any

damage, please immediately report to the transport company or equipment company in writing.

After receiving the machine, please check the unit and accessories in reference to the packing list.

Ensure that the model is correct and

and quantity of accessory parts are correct.

Determine the correct handling route and methods to avoid damaging the unit or causing possible

hazard. For the sake of protection

not permitted to do this even under special circumstances, do not remove the packaging box to avoid

loosening or falling during handling.

Confirm if the installing foundation is solid. When this unit is to be installed on the metal section of the

building, make sure that the electrical insulation must comply with applicable standards.

Ensure that the place of installation is far from the area where the inflammable or

ive substances are stored to avoid possible explosion or fire due to leakage.

explos

the unit is in good condition. Please also check if the specification

and safety, it is suggested to move the unit with the packaging box. It is

surface or internal

3.2 Installation Site

ķ. Install the unit where it will not be tilted by more than 5°.

ĸ. During installation, if the outdoor unit has to be exposed to strong wind, it must be fixed securely.

If possible, do not install the unit where it will be exposed to direct sunlight. (If necessary, install a blind

that does not interfere with the air flow.)

(1) Install the outdoor unit in a place where it will be free from being dirty or getting wet by rain as

much as possible.

(2) Install the outdoor unit where it is convenient to connect with the indoor unit.

(3) Install the outdoor unit where the condensate water can be drained out freely during heating

operation.

(4) Do not place animals and plants in the path of the warm air.

(5) Take the air conditioner weight into account and select a place where noise and vibration are

less.

(6) Install the outdoor unit where it is capable of withstanding the weight of the un

as little noise and vibration as possible.

(7) Provide the space shown in Figure 3-2-1, so that the air flow is not blocked. Also for

efficient

operation, make sure to leave three planes clear of any obstructions.

it and generates

500mm

G஘

500mm

G஘

(1-2/3feet)

2000mm

(6-5/9feet)

஘

3.3 Caution for Installation

500mm

G஘

(1-2/3feet)

Figure 3-2-1

஘

2000mm

(6-5/9feet)

1000mm

(3-2/7feet)

஘

G஘

500mm

(1-2/3feet)

The outdoor unit should be s

o install

that th

e ai

r discharged out of the outdoor unit will not flow

back and that enough space shall be maintained around the machine for repair.

The installing position should allow good ventilation so that the machine can breathe and exhaust

enough air. Ensure that there is no obstruction at the inlet and outlet of the machine. If any, please

remove the obstructions blocking the air inlet and outlet.

If the outdoor unit is installed on concrete or solid ground, it should be secured by using M10 bolts

and nuts. And ensure that the machine is kept vertically and horizontally correct.

The outdoor unit must be lifted by using the designated lift hole. During lifting, take care to protect

the air conditioner and avoid

knocking the metal parts to prevent rusting in the future.

To meet the noise and vibration requirements, the outdoor unit should be installed by using

rubber damping pad or spring damper.

To install the condensate pipe, please insert the drainage joint to the drainage hole on the outdoor

chassis and connect a condensate pipe on the drainage joint. (The installing height of outdoor unit should

be at least 5cm (2inches) if drainage joint is to be used).

To insert the pipe through the wall, the wall cross tube must be installed.

The installing dimensions should comply with the installation requirements in these instructions.

The outdoor unit must be secured at the installing position.

The installation should be done by certified technicians.

3.4 Dimension Data

Figure 3-2-2

Item

Model

955

(37-5/8)

396

(15-5/8)

700

(27-1/2)

560 (22)

360

(14-1/8)

DHR18CSB21S

1107

(43-5/8)

440

(17-3/8)

1100

(43-1/4)

631

(24-7/8)

400

(15-3/4)

DHR24CSB21S

DHR30CSB21S

DHR36CSB21S

Table 3-2-1

A B C D E

980

(38-5/8)

427

(16-3/4)

790

(31-1/8)

610

(24)

Unit: mm (inch)

395

(15-1/2)

DHR42CSB21S

DHR48CSB21S

958

(37-3/4)

412

(16-1/4)

1349

(53-1/8)

572

(22-1/2)

376

(14-3/4)

4. REFRIGERATION PIPING WORK

4.1 Refrigeration Piping Work Procedures and Caution in Connecting

4.1.1 Flare Processing

(1) Cut the connection pipe with the pipe cutter and remove the burrs.

(2) Hold the pipe downward to prevent cuttings from entering the pipe.

(3) Remove the flare nuts at the stop valve of the outdoor unit and inside the accessory bag of the

indoor unit, then insert them to the connection pipe, after that, flare the connection pipe with a

flaring tool.

(4) Check to ensure the flare part is spread evenly and t

here are no cracks (see Figure 3-3-1).

90°±1°

Figure 3-3-1

4.1.2 Bending Pipes

(1) The pipes are shaped by your hands. Be careful not to collapse them.

Extend the pipe by unwinding it

√

Figure 3-3-2

(2) Do not bend the pipes in an angle more than 90°.

(3) When pipes are repeatedly bent or stretched, the material will harden, making it difficult to bend or

stretch them any more. Do not bend or stretch the pipes more than three times.

7/8inch)

or over.

. If the pipe is bent repeatedly at the same place, it will break.

If the centering is improper, the flare nut

Do not remove the flare nut until the connection pipe is to be connected so as to prevent dust and impurities from

coming into the pipe system.

(4) When bending the pipe, do not bend it as is. The pipe will be collapsed. In this case, cut the heat

insulating pipe with a sharp cutter as shown in Figure 3-3-3, and bend it after exposing the pipe.

After bending the pipe as you want, be sure to put the heat insulating pipe back on the pipe, and

secure it with tape.

Pipe

Heat insulating

pipe

Cutter

Cutt line

Figure 3-3-3

ķ. To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of curvature of 150mm (5-

4.1.3 Connecting the Pipe at the Indoor Unit Side

Detach the caps and plugs from the pipes.

ķ. Be sure to apply the pipe against the port on the indoor unit correctly.

cannot be tightened smoothly. If the flare nut is forced to turn, the threads will be damaged.

ĸ.

When connecting the pipe to the unit or removing it from the unit, please do use both the wrench and

the torque wrench (Figure 3-3-4).

When c

onnecting, smear both inside and outsi

the flare nut with refrigeration oil, screw it tight

de of

by hand and then tighten it with the wrench.

Refer to Table 3-3-1 to check if the wrench has been tightened properly (too tight would mangle the nut

and lead to leakage).

Examine the connection pipe to see if it leaks, then take the treatment of heat insulation, as shown in

the Figure 3-3-4.

Use the medium-sized sponge to insulate the coupler of the gas pipe.

Threaded fastener(×4)

Pipe Diameter

Tightening Torque

6mm (1/4inch)

15~30N·m (11~22ft.-1b.)

9.5mm (3/8inch)

35~40N·m (26~29ft.-1b.)

12.7mm (1/2inch)

45~50N·m (33~37ft.-1b.)

16mm (5/8inch)

60~65N·m (44~48ft.-1b.)

Be sure to connect the gas pipe after connecting the liquid pipe completely.

Gas inlet pipe

Liquid pipe

Sponge

Heat insulation sheath (for the liquid tube)

Heat insulation sheath (for the gas tube)

Figure 3-3-4

Table 3-3-1 Flare nut tightening torque

4.1.4 Connecting the Pipe at the Outdoor Side Unit

Tighten the flare nut of the connection pipe at the outdoor unit valve connector. The tightening method

is the same as that as at the indoor side.

Gas pipe

coupling

Liquid pipe

Pipe

3-way valve 2-way valve

Figure

3-3-5

4.1.5 Checking the Pipe Connections for Gas Leaking

Do not purge the air with refrigerants but use a vacuum pump to vacuum the installation! There is no extra refrigerant in the

outdoor unit for air purging!

For both indoor and outdoor unit side, check the joints for gas leaking by the use of a gas leakage

detector without fail when the pipes are connected.

4.1.6 Heat Insulation on the Pipe Joints (Indoor Side Only)

Stick coupler heat insulation (large and small) to the place where connecting pipes.

Reference A

Front outlet

Coupler heat insulation (small) on the pipe

Coupler heat insulation (large) on the pipe

Liquid pipe

Gas pipe

Figure 3-3-6

4.1.7 Vacuum and Gas Leakage Inspection

4.1.7.1 Vacuum

Reference A: Cover this portion with heat insulating material also without fail

No gap

Heat insulation pipe

(1) Remove the caps of the liquid valve, gas valve and also the service port.

(2) Connect the hose at the low pressure side of the manifold valve assembly to the service port of

the unit’s gas valve, and make sure the gas and liquid valves should be kept closed in case of

refrigerant leak.

(3) Connect the hose used for evacuation to the vacuum pump.

(4) Open the switch at the lower pressure side of the manifold valve assembly and start the vacuum

pump. Meanwhile, the switch at the high pressure side of the manifold valve assembly should be

kept closed, otherwise evacuation would fail.

(5) The evacuation duration depends on the unit’s capacity, generally, 20 minutes for the 18kunits,

30 minutes for the 24k/30k/36k units, 45 minutes for the 42k/48k units. And verify if the pressure

gauge at the low pressure side of the manifold valve assembly reads -1.0MPa (145psig), if not, it

indicates there is leak somewhere. Then, close the switch fully and then stop the vacuum pump.

(6) Wait for some time to see if the system pressure can remain unchanged, 3 minutes for the

18k/24k units, 10 minutes for the 30k/36k/42k/48k units. During this time, the reading of the

pressure gauge at the low pressure side can not be larger than 0.005MPa (0.72psig).

(7) Slightly open the liquid valve and let some refrigerant go to the connection pipe to balance the

Model

Additional Refrigerant Amount for

18k

45g per 1.5 m (1.6 ounce per 5 feet )

24k~48k

90g per 1.5 m (3.2 ounce per 5 feet )

pressure inside and outside of the connection pipe, so that air will not come into the connection

pipe when removing the hose. Note that the gas and liquid valve can be opened fully only after the

manifold valve assembly is removed.

(8) Place back the caps of the liquid valve, gas valve and also the service port.

Pressure gauge (Low-pressure)

Switch (Low-pressure)

Connection pipe (to indoor unit)

Liquid valve

Gas valve

Service port

Cap

Vacuum pump

gauge manifold

Hose

Pressure gauge (Hi-pressure)

Switch (Hi-pressure)

Connection pipe

Cap

Service pipe

Cap

Hose with the valve pin

Note:

For the large-sized unit, it has the service port for both the gas valve and the liquid valve.

During evacuation, it is available to connect two hoses of the manifold valve assembly to two service ports

to quicken the evacuating speed.

4.1.7.2 Additional Charge

Refrigerant suitable for a piping length of 7.6m (25feet) is charged in the outdoor unit at the factory.

When the piping is longer than 7.6m (25feet), additional charging is necessary.

For the additional amount, see Table 3-3-2.

When the height difference between the indoor unit and outdoor unit is larger than 10m (32-4/5feet),

Item

Figure 3-3-7

Table 3-3-2

Extra Pipe

an oil bend should be employed for every 6m (19-2/3 feet).

Item

Size of Fitting Pipe

mm (inch)

Max. Pipe

Max. Height Difference

en Indoor Unit and

m (feet)

Drainage pipe(Outer

mm (inch)

Liquid

Gas

6(1/4)

12.7(1/2)

3/5)

Φ17

100)

9.5(3/8)

16(5/8)

2/5)

Φ17×1.75(Φ5/8 × 7/100)

2/5)

Φ17×1.75(Φ5/8 × 7/100)

2/5)

Φ17×1.75(Φ5/8 × 7/100)

Φ17×

7/100)

Φ17×1.75(Φ5/8 × 7/100)

. Before obtaining access to terminals, all supply circuits must be disconnected.

. The rated voltage of the unit is as shown as Table 1-4-1 and Table 1-4-2

. Before turning on, verify that the voltage is within the 187~252V range (for single phrase units).

. Always use a special branch circuit and install a special receptacle to supply po wer to the air conditioner.

. Use a special branch circuit breaker and receptacle matched to the capacity of the air conditioner.

Always use a circuit that can trip all the poles

of the wiring and has an isolation distance of at least 3mm (1/8inch) between the contacts of each pole.

. Perform wiring work in accordance with standards so that the air conditioner can be operated safely and positively.

cuit breaker in accordance with the related laws and regulations and electric

company standards.

Oil bend

Outdoor

Indoor

Oil bend

6m(19-2/3feet)

Figure 3-3-8

4.2 Specification of Connection Pipe

Table 3-3-3

betwe

Outdoor Unit

15(49-1/5)

30(98-2/5)

Model

DHR18CSB21S

DHR24CSB21S

DHR30CSB21S

DHR36CSB21S

DHR42CSB21S

DHR48CSB21S

Length

m (feet)

20(65-

30(98-

50(164)

The connection pipe should be insulated with proper water-proof insulating material.

The pipe wall thickness shall be 0.5~1.0mm (1/50~1/25inch) and the pipe wall shall be able to

withstand the pressure of 6.0MPa (870psig). The longer the connecting pipe, the lower the cooling and

heating effect performs.

Diameter × wall

thickness)

×1.75(Φ5/8 × 7/

1.75(Φ5/8 ×

5. ELECTRIC WIRING WORK

5.1 Wiring Precautions

ļ. The special branch circuit breaker is installed in the permanent wiring.

ľ. Install a leakage special branch cir

ķ.

The power source capacity must be the sum of the air conditioner current and the current of other electrical

appliances. When the current contracted capacity is insufficient, change the contracted capacity.

. When the voltage is low and the air conditioner is difficult to start, contact the power company to raise the voltage.

5.2 Electrical Wiring

(1) For solid core wiring (Figure 3-4-1)

1) Cut the wire end with a wire cutter or wire-cutting pliers, then strip the insulation about 25mm (1

inch).

2) Using a screwdriver, remove the terminal screw(s) on the terminal board.

3) Using pliers, bend the solid wire to form a loop suitable for the terminal screw.

4) Shape the loop wire properly, place it on the terminal board and tighten securely with the

terminal screw using a screwdriver.

For strand wiring (Figure 3-4-1).

(2)

Cut the wire end with a wire cutter or wire-cutting pliers, then strip the insulation about 10mm

(3/8inch).

Using a screwdriver, remove the terminal screw (s) on the terminal board.

3) Using a round terminal fastener or pliers, securely clamp a round terminal to each stripped wire

end.

4) Position the round terminal wire, and replace and tighten the terminal screw with a screwdriver

(Figure 3-4-2).

A Solid wire B Strand wire

Solderless terminal

25mm(1inch)

Insulation layer

10mm(3/8inch)

Figure 3-4-1

Screw with special washer

Round

terminal

Terminal board

Wire

Screw with special washer

Round terminal

Wire

Insulation tube

Cord clamp

Figure 3-4-2 Figure 3-4-3

(3) How to fix connection cord and power cord by cord clamp

After passing the connection cord and power cord through the insulation tube, fasten it with the cord

clamp (Figure 3-4-3).

. Before starting work, check that power is not being supplied to the indoor unit and outdoor unit.

Erroneous wiring

may cause burning of the electric parts.

. Erroneous wiring may cause burning of the electric parts.

. Connect the connection cords firmly to the terminal block. Imperfect installation may cause a fire.

(If the insulator is not clamped, electric

leakage may occur.)

. Always connect the ground wire.

ĸ. Match the terminal block numbers and connection cord colors with those of the indoor unit side.

Ļ. Always fasten the outside covering of the connection cord with cord clamps.

(4) Electric wiring between the indoor and outdoor units

 Duct Type Unit:

Single-phase units (18k~30k)

Single-phase unit

s (36k~48k)

 Cassette Type Unit:

Single-phase units: 18k

Single-phase units: 24

k~30k

Single-phase units: 36k~42k

Single-phase units: 48k

 Floor ceiling Type Unit:

Single-phase units (18k~30k)

Single-phase units (36k~4

8k)

Figure 3-4-4

(5) Electric wiring of indoor unit side

Remove the electric box cover from the electric box sub-assy and then connect the wire.

 Duct Type Unit:

L1 L2

F C O

1 2

H1 H2

Electric box sub-assy

Electric box

cover

Figure 3-4-5

The F, C, O connect to the COMMOM, CLOSE and OPEN terminal of the fresh air valve respectively.

 Cassette Type Unit:

For the units: 18k~42k

For the units: 48k

Figure 3-4-6

 Floor Ceiling Type Unit:

Electric box cover

Left side panel

Figure 3-4-7

ķ. The power cord and the wire of the fresh air valve are high-voltage, while the communication cord and connection

wire of the wired zone controller are low-voltage. They should run separately against electromagnetic interference.

8. The high-voltage and low-voltage lines should pass through the rubber rings at different electric box covers.

Do not bundle the connection wire of the wired

them in parallel, otherwise improper operation would occur.

zone controller and the communication cord together, or arrange

ĺ. The high-voltage and low-

voltage lines should be fixed separately and securely, with internal big clamps for the

former and small clamps for the latter.

Tighten the indoor/outdoor connection cord and power cord respectively on the terminal boards with screws. Faul ty

connection may cause a fire.

If the indoor unit connection cord (to the outdoor unit) and power supply are wired incorrectly, the air conditioner

may be damaged.

. Ground both the indoor and outdoor units by attaching a ground wire.

. Unit shall be grounded in compliance with the applicable local and national codes.



Ļ.

ļ.

Ľ. Connect the indoor unit connection cord properly based on the corresponding marks as show n in Figure 3-4-4.

(6) Electric wiring of outdoor unit side

TICE!

When connecting the power supply cord, make sure that the phase of the power supply



matches with the exact terminal board. If not, the compressor will rotate reversely and run improperly.

Remove the big handle (18k~30k) /front board (36k~48k) of the outdoor unit and insert the end of the

communication cord and the power cable into the terminal board.

Single phase:

L1 L2

18k~30k 36k~48k

Figure 3-4-8

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.

MAINTENANCE TROUBLESHOOTING

ERROR CODES TABLE

6.1 Main Control Malfunction

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

Control description

protection

switch

sensor

switch

protection

high

board

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

Control description

sensor

board

No.

Error code

Malfunction

name

Origin of

malfunction signal

Control description

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.

tem

chip

6.2 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

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

7. FLOW CHART OF TROUBLESHOOTING

7.1 Troubleshooting Flow Chart of Main Control Malfunction

 E1 High Pressure Protection

 E2 Freeze Protection

Freeze protection is normal protecti

on but 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.

 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

 E9 Full Water Protection

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

 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

 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

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

 F5 Malfunction of Wired Controller Temperature Sensor

Malfunction of

wired controller

temperature

sensor

Replace the

wired controller

 H6 Malfunction of Outdoor Fan Motor

 E8 Malfunction of Indoor Fan Motor

Malfunction of

indoor fan motor

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

7.2 Troubleshooting Flow Chart of Drive Malfunction

Note: For Outdoor Unit

P0 Drive module reset

Drive (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

 P8 IPM or PFC over-temperature protection

P8 is displayed on

P8 is displayed in the

wired zone

controller

mainboard 88

Indicating light

Yes

Replace the

mainboard

 PH DC busbar over-v

oltage protection

 PL DC busbar under-voltage protection

Is the

IPM or PFC module

of mainboard

tightened˛

Works normally

Tighten the IPM

or PFC module

 P6 Drive-to-main-control communication error

 Lc Compressor Startup Failure

Lc is displayed on

the wired controller

Lc is displayed in

the mainboard 88

indicating light

Yes

 P5 Compressor

current 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

 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 err

ee is displayed

on the wired

controller

Yes

Is the

jumper

loose˛

Replace the

mainboard

Works normally

Yes

Tighten the

Tighten the PFC

wire or adjust the

sequence

jumper

Works Normally

 H6 DC fan error

7.3 Interface

NO.

SILK-SCREEN

Power supply interface to the drive

DC_MOTOR2

DC_MOTOR1

Power supply interface to the drive

 DHR18CSB21S / DHR24CSB21S / DHR30CSB21S / DHR36CSB21S / DHR42CSB21S /

DHR48CSB21S Main Control Board

INTERFACE INTERFACE INSTRUCTION

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

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

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

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

valve:

1 to 4-pin: Drive impulse output;

5-pin: +12V;

Electronic expansion valve line 1 to 4-pin: Drive impulse output;5-pin: +12V;

HEAT Compressor electrical heater Compressor electric heating belt

VA-1 Chassis electrical heater Chassis electric heating belt

4V 4-way valve 4-way valve

 DHR18CSB21S / DHR24CSB21S / DHR30CSB21S / DHR36CSB21S / DHR42CSB21S

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

(1) Driving 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

(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

Interface

Live wire output (red)

E2 (Reserved)

AC-N

Neutral wire input (white)

AC-L

Interface

Grounding wire

 DHR48CSB21S

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

(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

(2) Filtering Board:

No.

Printing

No.

Printing

1 N-OUT

L-OUT

BUS

DC bus interface (connect to drive board)

4 AC-L

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)

7.4 IPM, PFC Testing Method

7.4.1 Method of Testing IPM Module

(1) Preparation before test: Prepare a universal meter and

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 followi

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.

7.4.2

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,

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

Step 2: put the red probe on the place N and the black one on the wiring terminal L1-2,

L2-1respectively as shown in the following figure to measure the voltage between N L1-2 and NL2-1.

ng figure to measure the voltage between UP, VP and WP.

turn to its diode option, 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

 DHR48CSB21S

8. WIRING DIAGRAM

8.1 Outdoor unit

The actual wiring should always refer to the wiring diagram of the unit.

Model: DHR18CSB21S



 Model: DHR24CSB21S

 Model: DHR30CSB21S

 Model: DHR36CSB21S

 Model: DHR42CSB21S

 Model: DHR48CSB21S

8.2 Indoor unit

The actual wiring should always refer to the wiring diagram of the unit.

8.2.1 Duct Type

 Model: DHR18NDB21S / DHR24NDB21S / DHR30NDB21S / DHR36NDB21S / DHR42NDB21S

 Model: DHR48NDB21S

8.2.2 Floor Ceiling Type

 Model: DHR18NCB21S /DHR24NCB21S /DHR30NCB21S / DHR36NCB21S / DHR42NCB21S /

DHR48NCB21S

8.2.3 Cassette Type

 Model: DHR18NKB21S

 Model: DHR24NKB21S / DHR30NKB21S / DHR36NKB21S / DHR42NKB21S

 Model: DHR48NKB21S

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

LIT - 12012157

Johnson Controls DHR24CSB21S, DHR36CSB21S, DHR30CSB21S, DHR18CSB21S, DHR42CSB21S Installation And Maintenance Manual

Specifications and Main Features

Frequently Asked Questions

User Manual