Daikin GYEQ20AN User manual

Heat Recovery R-410A 50 Hz

GYEQ20/30AN

SiAUY361411EA

Service

Manual

Gas Heat Pump

Air Conditioner

SiAUY361411EA

iTable of Contents

Gas Heat Pump

Air Conditioner

Heat Recovery

R-410A 50 Hz

ED Reference

For items below, please refer to Engineering Data.

1. Introduction ............................................................................................ iv

1.1 Safety Precautions ...................................................................................v

Part 1 General Information ........................................................... 1

1. Model Names ..........................................................................................2

1.1 Indoor Units ..............................................................................................2

1.2 Outdoor Units ...........................................................................................3

1.3 BS Units ...................................................................................................3

1.4 Air Treatment Equipment .........................................................................3

2. External Appearance...............................................................................4

2.1 Indoor Units ..............................................................................................4

2.2 Outdoor Units ...........................................................................................5

2.3 BS Units ...................................................................................................5

2.4 Air Treatment Equipment .........................................................................5

3. Capacity Range.......................................................................................6

3.1 Combination Ratio....................................................................................6

3.2 Indoor Unit Connection Capacity..............................................................6

3.3 Heat Recovery Operation.........................................................................6

Part 2 Device Overview ................................................................ 7

1. Model Naming .........................................................................................8

2. Unit Specifications...................................................................................9

3. External Diagrams.................................................................................10

4. Structural Diagrams ..............................................................................12

5. System Diagrams..................................................................................14

5.1 Refrigerant System Diagrams ................................................................14

5.2 Cooling Water, Intake Air, Fuel and Engine Oil System Diagram ..........23

No. Item ED No. Page

1 Specification – Indoor Unit EDAU361403 16-17, 32-33, 48-49, 76-77, 94, 108-109, 126-128,

146-147, 166-168, 194, 206, 220-221, 234-237,

256

2 Specification – Outdoor Unit EDAU361402 40

3 Piping Diagram EDAU361402 44

4 Accessories EDAU361402 56

SiAUY361411EA

Table of Contents ii

6. Sensor Mounting Positions ...................................................................25

6.1 Sensors Installed on the Engine.............................................................25

6.2 Sensors Installed in the System .............................................................26

7. Electrical Wiring Diagrams ....................................................................27

8. Installation Work Manual.......................................................................28

9. Wiring Manual .......................................................................................57

10.Test Run Manual...................................................................................67

Part 3 Control and Functionality ................................................ 89

1. Control Overview...................................................................................90

1.1 System Control Overview.......................................................................90

1.2 Startup Sequences.................................................................................93

1.3 Actuators ................................................................................................95

1.4 Setting Up and Rewiring the Outdoor Unit .............................................96

2. Outdoor Unit Control .............................................................................98

3. Actuator Control ..................................................................................103

3.1 Electric Motor Operated Valve Control.................................................103

3.2 Pump Control .......................................................................................107

3.3 Fan Control...........................................................................................107

3.4 Heater Control ......................................................................................107

3.5 Starter Control ......................................................................................107

3.6 Compressor Clutch Control ..................................................................107

3.7 Ignition Timing Control .........................................................................108

Part 4 Troubleshooting ............................................................. 109

1. Troubleshooting the Outdoor Unit .......................................................110

1.1 Error Codes ..........................................................................................110

1.2 How to Use the Checker on PCB .........................................................113

1.3 RUN Mode............................................................................................115

1.4 STOP Mode..........................................................................................121

1.5 Main Operations in Servicing ...............................................................125

2. Flow Charts for Troubleshooting .........................................................128

2.1 Problems without Error Codes .............................................................128

2.2 Problems with Error Codes ..................................................................131

Part 5 Parts Inspection ............................................................. 169

1. Inspecting the Outdoor Unit ................................................................170

1.1 Safety Precautions for Inspecting or Servicing the Outdoor Unit .........170

1.2 Inspecting the Starter System ..............................................................171

1.3 Inspecting the Fuel Control System .....................................................173

1.4 Inspecting the Mixer System ................................................................174

1.5 Inspecting the Ignition System .............................................................176

1.6 Inspecting the Regulator ......................................................................179

1.7 Inspecting the Valve Clearance............................................................179

1.8 Inspecting the Compression Pressure .................................................180

1.9 Inspecting the Belt................................................................................180

1.10 Inspecting the Air Cleaner ....................................................................181

1.11 Inspecting the Breather Hose...............................................................181

1.12 Inspecting the Engine Oil Level............................................................182

SiAUY361411EA

iii Table of Contents

1.13 Inspecting Refrigerating Machine Oil and Refrigerant..........................183

1.14 Inspecting the Cooling Water Filter ......................................................184

1.15 Checking the Cooling Water System for Water Leaks .........................184

1.16 Inspecting the Cooling Water Level......................................................185

1.17 Inspecting the Water Motor-operated Valve.........................................185

1.18 Inspecting the Thermostat....................................................................186

1.19 Inspecting the Cooling Water Concentration........................................187

1.20 Inspecting the Oil Pressure Switch.......................................................187

1.21 Inspecting the Cooling Water Temperature Sensor .............................187

1.22 Inspecting the Exhaust Temperature Sensor .......................................188

1.23 Inspecting the Compressor ..................................................................189

1.24 Inspecting the Compressor Clutch .......................................................190

1.25 Inspecting the Solenoid Valves ............................................................191

1.26 Inspecting the Outdoor Fan Motor........................................................192

1.27 Inspecting the Refrigerant Amount.......................................................193

1.28 Inspecting the Check Valve..................................................................194

1.29 Inspecting the Electronic Expansion Valve ..........................................195

1.30 Checking Stop Valve Operation ...........................................................196

1.31 Inspecting the Four-way Valve .............................................................197

1.32 Inspecting the SC Coil..........................................................................197

1.33 Inspecting the Refrigerant System Sensors .........................................198

1.34 Inspecting the Outdoor Unit's Circuit Boards and

Power Supply System ..........................................................................200

1.35 Inspecting the Communication Cables.................................................200

1.36 Inspecting the Heaters .........................................................................201

Part 6 Replacement of Parts .................................................... 202

1. Precautions to Take before Replacement...........................................203

1.1 Safety Precautions ...............................................................................203

1.2 Safety Precautions for Replacement....................................................203

2. Replacement of Primary Parts ............................................................204

2.1 Replacing the Engine ...........................................................................204

2.2 Replacing the Compressor...................................................................206

2.3 Replacing the Compressor Heater .......................................................209

2.4 Charging the Refrigerating Machine Oil ...............................................209

2.5 Charging the Refrigerant ......................................................................210

2.6 Removing the Control Box ...................................................................210

Part 7 Maintenance / Service Data ........................................... 211

1. Maintenance........................................................................................212

1.1 Periodic Inspection Items, Quantities,

and Standard Values for the Outdoor Unit ...........................................212

1.2 Periodic Inspection Procedure for the Outdoor Unit.............................213

2. Servicing Data.....................................................................................225

2.1 Resistance/Temperature Characteristics of Various Sensors..............225

2.2 Pressure/Voltage Characteristics of Pressure Sensors .......................226

2.3 Pressure/Saturation Temperature Conversion Chart for

Outdoor Unit Pressure Sensors ...........................................................227

2.4 Tightening Torque Table ......................................................................228

2.5 Standard Operation Data (Reference Values) .....................................230

SiAUY361411EA Introduction

1. Introduction

This service manual covers the GYEQ20AN and GYEQ30AN outdoor unit models of the

Yanmar Gas Heat Pump system, and the indoor units that can be connected to these models.

The following safety alert symbols are used throughout this service manual to highlight safety

precautions so that you can safely perform maintenance and servicing tasks in accordance with

the instructions contained in the manual:

: This safety alert symbol appears with particularly important instructions. Make sure

you follow the instructions.

This manual uses the following icons to highlight safety precautions you must follow to prevent

accidents that may occur while inspecting or repairing the unit as well as to ensure safety after

you have completed the tasks:

Warning Indicates that there is a possibility that a fatal accident or serious injury

may result from failure to take sufficient safety precautions.

Caution Provides instructions for safe handling or indicates that there is a

possibility that an injury or a serious breakage of the product may

result from failure to take sufficient safety precautions.

Icon Title Description

Prohibited Indicates a prohibited action.

Mandatory Indicates a mandatory action.

Connect to

ground Instructs you to make a ground connection without fail.

Caution:

Electric shock!

Indicates that you may possibly get an electric shock under certain

situations.

Caution:

High temperature!

Indicates that you may possibly get burned or otherwise injured

due to high temperatures under certain situations.

Caution:

Rotating parts!

Indicates that removing a guard or protector for a rotating part

(such as a motor or a fan) could possibly result in an injury.

Introduction SiAUY361411EA

1.1 Safety Precautions

Safety precautions

Safety precautions to take before and during inspection or repair

Warning Before you perform disassembly and assembly, be sure to turn

OFF the main power switch.

Take extreme care not to touch the charging unit during work;

otherwise you may get an electric shock, possibly resulting in a

fatal accident or serious injury.

While the power is being supplied, some electrical parts are

charged with high voltages from 200 V to 300 V. Inadvertently

touching such high-voltage parts could result in a possibly fatal

electric shock.

When accessing the electrical system (for example, to locate

faulty parts), take sufficient care not to inadvertently touch the

charging unit. Also, be sure to disconnect the main power

connector from the outlet before replacing parts.

If refrigerant gas is leaking, pinpoint and permanently fix the

leaking spot, rather than merely charging the refrigerant.

After fixing the leaks, charge the refrigerant and then recheck for

any leaks.

If you cannot pinpoint the leaking spot and thus cannot continue

the repair work, recover the refrigerant and then close the

servicing valve.

Failure to recover the refrigerant could cause the refrigerant gas

to leak into the air-conditioned room.

The refrigerant itself is harmless but can cause the generation of

toxic gas when it is exposed to high temperatures associated with

a fan, heater, stove, burner, or the like.

When working in high places, be sure to use a helmet and/or

lifeline in case you topple or fall; otherwise, you could face a

greater risk of a fatal accident or serious injury.

When you repair parts contained in a compartment (particularly

the engine room) inside a unit such as an outdoor unit with the

unit's panels removed, be sure to wear protective gloves and

other clothing to prevent injuries that may occur as the result of

inadvertently touching protrusions or edges inside the unit and

follow the specified procedure.

Caution If you have to repair parts with the power ON, be sure to attach a

protective cover before turning ON the power.

Working without a protective cover attached could possibly result

in an electric shock or injury.

When accessing a compressor to check for or repair faulty parts,

never touch the compressor with bare hands while it is operating

or when it has just stopped; otherwise, you could get burned.

When installing a fan, properly tighten the fan screw.

If poorly tightened, the fan may come off while operating, possibly

resulting in an injury.

Do not work in an improper position when you carry or move a

heavy object.

Working in an improper position could result in an acute low back

pain or an injury due to dropping of a heavy object.

When repairing parts, use tools that suit your purpose.

Using inappropriate tools could result in an injury.

During repair work, take sufficient care to keep away people other

than service engineers, because unexpected dangers may be

present.

SiAUY361411EA Introduction

Safety precautions to take after inspection or repair

Warning Upon completion of repair work, check the insulation with a mega

ohmmeter (insulation resistance tester) to make sure that the

insulation resistance is 2 MΩor higher. If the insulation resistance

is lower than 2 MΩ, an electric shock or fire may possibly result;

therefore, inspect electrical parts, lead wires, and other related

parts and replace any faulty parts.

During repair work, check lead wires, connector terminals, power

cords, main power connector, and other related parts for

contamination or deterioration.

Replace any flawed or deteriorated parts, which may possibly

cause an electric shock or fire.

When any lead wire is found disconnected, reconnect the lead

wire properly, for example, by using a nylon connector or by

twisting and then soldering the conductors.

Poor connections may possibly result in an electric shock or

injury.

Check the main power connector for accumulated dust and

shakiness, and plug it in properly. Using the main power

connector with dust accumulated on it or without plugging it in

properly could result in an electric shock or fire.

The product must be securely installed on a solid surface that can

fully bear the product's weight and vibration during operation.

Never install the product (indoor or outdoor unit) either on a

surface that cannot bear the product's weight and vibration during

operation or in an unstable way; otherwise, the product may fall,

possibly resulting in a fatal accident or serious injury.

Never modify the product in any way.

Modifying the product could result in an electric shock,

overheating, or fire.

When relocating the unit, securely install it on a surface that can

bear its weight.

Never install the unit either on a surface that cannot bear the

product's weight and vibration during operation or in an unstable

way; otherwise, the unit may fall, possibly resulting in an injury.

Use specified cables for wiring between outdoor and indoor units.

The cables should be perfectly connected to the appropriate

connectors and fastened tightly so that the terminal connectors

will not be exposed to external forces via the cables.

Using cables without properly connecting and fastening them

could result in overheating or fire.

The cables between outdoor and indoor units must be organized

so that the terminal covers will not rise. The terminal covers must

be properly attached.

Using the cables without properly attaching the covers could

result in an electric shock, overheating, or fire at the terminal

connections.

The power cord must not be modified and must be replaced if

broken. Also, the power cord must not be combined with an

extension cord or share the same outlet as other electrical

appliances via a power strip or the like because doing so could

result in an electric shock or fire. The power cord must not be

loaded with something heavy, heated, or pulled because doing so

could result in breakage.

If refrigerant gas is leaking, pinpoint and permanently fix the

leaking spot, rather than merely charging the refrigerant. After

fixing the leaks, charge the refrigerant and then recheck for any

leaks. If you cannot pinpoint the leaking spot and thus cannot

continue the repair work, perform pump down operation and then

close the servicing valve. Failure to recover the refrigerant could

cause the refrigerant gas to leak into the air-conditioned room.

The refrigerant itself is harmless but can cause the generation of

toxic gas when it is exposed to high temperatures associated with

a fan, heater, stove, burner, or the like.

Introduction SiAUY361411EA

vii

Safety precautions to take after inspection or repair

Caution Any parts you use for repair must be listed on the servicing parts

table specific to the model.

Using unlisted parts could result in a recurring fault or fire.

Inspect ground connections and rework them as needed.

An improper ground connection could result in an electric shock.

Replace the installation base and mounting frames if they are

found deteriorated due to corrosion or some other reason.

Otherwise, the unit may fall, possibly resulting in an injury.

Never fill any refrigerants other than R-410A refrigerant.

This machine has been designed and manufactured as a

specialized unit for R-410A refrigerant.

If a different type of refrigerant other than R-410A refrigerant is

used, a mechanical fault, malfunction and failure may result,

which could cause a serious safety hazard.

The filled refrigerant type is described on the machine nameplate.

SiAUY361411EA Introduction

viii

List of safety warning plates/labels

■Types of warning/caution labels and plate

⑤

Warning label (High voltage)

①

Warning label (High temperature)

やけどの恐れあり。高温部に触れないこと

Don’t touch the high-temperature part

ঐሞඩຨພ!ข႙ۂࡴၫؠࠍ

②

Caution label (Stepping on parts)

③

Warning label (Rotating parts)

けがの恐れあり。回転部に触れないこと

Don’t touch the rotor

ঐሞඩ།ພ!ข႙ۂᅢᎡؠ

④

Caution plate (Outdoor unit)

023331-02EN00

感電の恐れあり。高電圧部に触れないこと

Don’t touch the high-voltage part

ঐሞඩۂݢ!ข႙ۂࡴݢᅼؠၤ

けがの恐れあり。上に乗らないこと

Danger.Don't step on.

ঐሞඩ།ພ!ᇋ኷ຢಅةྑ

（注）

保守サ−ビスなどに必要なスペース

は据付要領書を参照のこと

可燃物からの離隔距離

(cm)

ガス機器防火性能評定品

財団法人日本ガス機器検査協会

ご注意

類の回収が必要です。

は室外機内部に貼付されたシールに記載され

フロン類の種類及び数量は、製品銘板あるい（3）

ています。

フロン回収・破壊法

第一種特定製品

（1）

この製品には冷媒として、ＨＦＣが使われて

フロン類をみだりに大気中に放出することは

います。

禁じられています。

（2）この製品を廃棄・整備する場合には、フロン

 1. 本体に表示してあるガス種以外の燃料ガスは使用しないでください。

 2. ガス管接続には指定の強化ガスホース（または液化石油ガス継手金具付き低圧ガス

ホース）を使用してください。

 3. 冷媒配管接続後、気密試験を行ない漏れのないことを確認してください。

 4. D種接地工事を行ってください。感電の恐れがあります。※1

 5. カバー類は絶対開けないでください。回転体に接触したり、巻き込まれる恐れがあ

り危険です。

 6. 吹出口のファンカバーを絶対に取外さないでください。ファンが露出して危険です。

 7. 排気ガスは周囲に悪影響の無い場所で大気開放してください。排水枡、溝等への排

出は中毒の恐れがあります。

 8. 排気ドレンは室内機ドレン配管と一緒にしないでください。そして大気開放された

場所に排出してください。排気ガスが室内に入り危険です。

 9. 排気ドレンは雑排水溝等の適切な排水溝まで配管して排出してください。コンクリ

ート表面を汚したり、シート防水を損傷する恐れがあります。

10. 運転中異常な振動や音があるときは、ただちに運転を停止し、自分で修理せずに、

お買い求めの販売店に連絡ください。

11. 排気出口より白い煙が出ることがありますが、これは異常ではありません。

12. 長期間ご使用にならない場合は、万一のガス漏れ防止のためガス元栓を閉じておい

てください。ただし、元電源は切らないでください。

６０以上

（前面）

（上面）

１５以上

１以上

排気口

R410A

Introduction SiAUY361411EA

Attached locations of safety warning plates/labels

026946-00X

026947-00X

∗Although the actual appearance is slightly different to the figure above, the location

of the safety labels is the same.

∗Although the actual appearance is slightly different to the figure above, the location

of the safety labels is the same.

Outside of outdoor unit

Indicated location of

the model name

Indicated location of

023332-01EN01

• GYEQ20AN

• GYEQ30AN

The model name is displayed at locations where the following label is attached:

Indicated location of the model name

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